From 5bb0b55a3283369f1cd8ac76a6d8bda8e7a77055 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Thu, 6 Apr 2006 21:26:46 -0500 Subject: [PATCH] [SCSI] iscsi: convert iscsi tcp to libiscsi This just converts iscsi_tcp to the lib Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/iscsi_tcp.c | 6469 +++++++++++++++++++--------------------------- drivers/scsi/iscsi_tcp.h | 182 +- 2 files changed, 2629 insertions(+), 4022 deletions(-) rewrite drivers/scsi/iscsi_tcp.c (60%) diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c dissimilarity index 60% index aca3e23b1b9..fe00a3f6d20 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -1,3856 +1,2613 @@ -/* - * iSCSI Initiator over TCP/IP Data-Path - * - * Copyright (C) 2004 Dmitry Yusupov - * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie - * maintained by open-iscsi@googlegroups.com - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published - * by the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * See the file COPYING included with this distribution for more details. - * - * Credits: - * Christoph Hellwig - * FUJITA Tomonori - * Arne Redlich - * Zhenyu Wang - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "iscsi_tcp.h" - -MODULE_AUTHOR("Dmitry Yusupov , " - "Alex Aizman "); -MODULE_DESCRIPTION("iSCSI/TCP data-path"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("0:4.445"); -/* #define DEBUG_TCP */ -/* #define DEBUG_SCSI */ -#define DEBUG_ASSERT - -#ifdef DEBUG_TCP -#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt) -#else -#define debug_tcp(fmt...) -#endif - -#ifdef DEBUG_SCSI -#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt) -#else -#define debug_scsi(fmt...) -#endif - -#ifndef DEBUG_ASSERT -#ifdef BUG_ON -#undef BUG_ON -#endif -#define BUG_ON(expr) -#endif - -#define INVALID_SN_DELTA 0xffff - -static unsigned int iscsi_max_lun = 512; -module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); - -/* global data */ -static kmem_cache_t *taskcache; - -#define session_to_cls(_sess) \ - hostdata_session(_sess->host->hostdata) - -static inline void -iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) -{ - sg_init_one(&ibuf->sg, (u8 *)vbuf, size); - ibuf->sent = 0; - ibuf->use_sendmsg = 0; -} - -static inline void -iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) -{ - ibuf->sg.page = virt_to_page(vbuf); - ibuf->sg.offset = offset_in_page(vbuf); - ibuf->sg.length = size; - ibuf->sent = 0; - ibuf->use_sendmsg = 1; -} - -static inline void -iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) -{ - ibuf->sg.page = sg->page; - ibuf->sg.offset = sg->offset; - ibuf->sg.length = sg->length; - /* - * Fastpath: sg element fits into single page - */ - if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) - ibuf->use_sendmsg = 0; - else - ibuf->use_sendmsg = 1; - ibuf->sent = 0; -} - -static inline int -iscsi_buf_left(struct iscsi_buf *ibuf) -{ - int rc; - - rc = ibuf->sg.length - ibuf->sent; - BUG_ON(rc < 0); - return rc; -} - -static inline void -iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, - u8* crc) -{ - crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc); - buf->sg.length += sizeof(uint32_t); -} - -static void -iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) -{ - struct iscsi_session *session = conn->session; - unsigned long flags; - - spin_lock_irqsave(&session->lock, flags); - if (session->conn_cnt == 1 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - spin_unlock_irqrestore(&session->lock, flags); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - iscsi_conn_error(conn->cls_conn, err); -} - -static inline int -iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) -{ - uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); - uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); - - if (max_cmdsn < exp_cmdsn -1 && - max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) - return ISCSI_ERR_MAX_CMDSN; - if (max_cmdsn > session->max_cmdsn || - max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) - session->max_cmdsn = max_cmdsn; - if (exp_cmdsn > session->exp_cmdsn || - exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) - session->exp_cmdsn = exp_cmdsn; - - return 0; -} - -static inline int -iscsi_hdr_extract(struct iscsi_conn *conn) -{ - struct sk_buff *skb = conn->in.skb; - - if (conn->in.copy >= conn->hdr_size && - conn->in_progress == IN_PROGRESS_WAIT_HEADER) { - /* - * Zero-copy PDU Header: using connection context - * to store header pointer. - */ - if (skb_shinfo(skb)->frag_list == NULL && - !skb_shinfo(skb)->nr_frags) - conn->in.hdr = (struct iscsi_hdr *) - ((char*)skb->data + conn->in.offset); - else { - /* ignoring return code since we checked - * in.copy before */ - skb_copy_bits(skb, conn->in.offset, - &conn->hdr, conn->hdr_size); - conn->in.hdr = &conn->hdr; - } - conn->in.offset += conn->hdr_size; - conn->in.copy -= conn->hdr_size; - } else { - int hdr_remains; - int copylen; - - /* - * PDU header scattered across SKB's, - * copying it... This'll happen quite rarely. - */ - - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER) - conn->in.hdr_offset = 0; - - hdr_remains = conn->hdr_size - conn->in.hdr_offset; - BUG_ON(hdr_remains <= 0); - - copylen = min(conn->in.copy, hdr_remains); - skb_copy_bits(skb, conn->in.offset, - (char*)&conn->hdr + conn->in.hdr_offset, copylen); - - debug_tcp("PDU gather offset %d bytes %d in.offset %d " - "in.copy %d\n", conn->in.hdr_offset, copylen, - conn->in.offset, conn->in.copy); - - conn->in.offset += copylen; - conn->in.copy -= copylen; - if (copylen < hdr_remains) { - conn->in_progress = IN_PROGRESS_HEADER_GATHER; - conn->in.hdr_offset += copylen; - return -EAGAIN; - } - conn->in.hdr = &conn->hdr; - conn->discontiguous_hdr_cnt++; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - } - - return 0; -} - -/* - * must be called with session lock - */ -static void -__iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_session *session = conn->session; - struct scsi_cmnd *sc; - - sc = ctask->sc; - if (unlikely(!sc)) - return; - - if (sc->sc_data_direction == DMA_TO_DEVICE) { - struct iscsi_data_task *dtask, *n; - /* WRITE: cleanup Data-Out's if any */ - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { - list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); - } - } - ctask->xmstate = XMSTATE_IDLE; - ctask->r2t = NULL; - ctask->sc = NULL; - list_del(&ctask->running); - - __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - - sc->scsi_done(sc); -} - -static void -iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_session *session = conn->session; - - spin_lock(&session->lock); - __iscsi_ctask_cleanup(conn, ctask); - spin_unlock(&session->lock); -} - -/** - * iscsi_cmd_rsp - SCSI Command Response processing - * @conn: iscsi connection - * @ctask: scsi command task - **/ -static int -iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - int rc; - struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr; - struct iscsi_session *session = conn->session; - struct scsi_cmnd *sc = ctask->sc; - - rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); - if (rc) { - sc->result = (DID_ERROR << 16); - goto out; - } - - conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; - - sc->result = (DID_OK << 16) | rhdr->cmd_status; - - if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { - sc->result = (DID_ERROR << 16); - goto out; - } - - if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) { - int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE); - - memcpy(sc->sense_buffer, conn->data + 2, sensecopy); - debug_scsi("copied %d bytes of sense\n", sensecopy); - } - - if (sc->sc_data_direction == DMA_TO_DEVICE) - goto out; - - if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { - int res_count = be32_to_cpu(rhdr->residual_count); - - if (res_count > 0 && res_count <= sc->request_bufflen) - sc->resid = res_count; - else - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) - sc->resid = be32_to_cpu(rhdr->residual_count); - -out: - debug_scsi("done [sc %lx res %d itt 0x%x]\n", - (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); - return rc; -} - -/** - * iscsi_data_rsp - SCSI Data-In Response processing - * @conn: iscsi connection - * @ctask: scsi command task - **/ -static int -iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - int rc; - struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr; - struct iscsi_session *session = conn->session; - int datasn = be32_to_cpu(rhdr->datasn); - - rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); - if (rc) - return rc; - /* - * setup Data-In byte counter (gets decremented..) - */ - ctask->data_count = conn->in.datalen; - - if (conn->in.datalen == 0) - return 0; - - if (ctask->datasn != datasn) - return ISCSI_ERR_DATASN; - - ctask->datasn++; - - ctask->data_offset = be32_to_cpu(rhdr->offset); - if (ctask->data_offset + conn->in.datalen > ctask->total_length) - return ISCSI_ERR_DATA_OFFSET; - - if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { - struct scsi_cmnd *sc = ctask->sc; - - conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; - if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { - int res_count = be32_to_cpu(rhdr->residual_count); - - if (res_count > 0 && - res_count <= sc->request_bufflen) { - sc->resid = res_count; - sc->result = (DID_OK << 16) | rhdr->cmd_status; - } else - sc->result = (DID_BAD_TARGET << 16) | - rhdr->cmd_status; - } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { - sc->resid = be32_to_cpu(rhdr->residual_count); - sc->result = (DID_OK << 16) | rhdr->cmd_status; - } else - sc->result = (DID_OK << 16) | rhdr->cmd_status; - } - - conn->datain_pdus_cnt++; - return 0; -} - -/** - * iscsi_solicit_data_init - initialize first Data-Out - * @conn: iscsi connection - * @ctask: scsi command task - * @r2t: R2T info - * - * Notes: - * Initialize first Data-Out within this R2T sequence and finds - * proper data_offset within this SCSI command. - * - * This function is called with connection lock taken. - **/ -static void -iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct iscsi_r2t_info *r2t) -{ - struct iscsi_data *hdr; - struct iscsi_data_task *dtask; - struct scsi_cmnd *sc = ctask->sc; - - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); - BUG_ON(!dtask); - INIT_LIST_HEAD(&dtask->item); - hdr = &dtask->hdr; - memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = r2t->ttt; - hdr->datasn = cpu_to_be32(r2t->solicit_datasn); - r2t->solicit_datasn++; - hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; - hdr->exp_statsn = r2t->exp_statsn; - hdr->offset = cpu_to_be32(r2t->data_offset); - if (r2t->data_length > conn->max_xmit_dlength) { - hton24(hdr->dlength, conn->max_xmit_dlength); - r2t->data_count = conn->max_xmit_dlength; - hdr->flags = 0; - } else { - hton24(hdr->dlength, r2t->data_length); - r2t->data_count = r2t->data_length; - hdr->flags = ISCSI_FLAG_CMD_FINAL; - } - conn->dataout_pdus_cnt++; - - r2t->sent = 0; - - iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, - sizeof(struct iscsi_hdr)); - - r2t->dtask = dtask; - - if (sc->use_sg) { - int i, sg_count = 0; - struct scatterlist *sg = sc->request_buffer; - - r2t->sg = NULL; - for (i = 0; i < sc->use_sg; i++, sg += 1) { - /* FIXME: prefetch ? */ - if (sg_count + sg->length > r2t->data_offset) { - int page_offset; - - /* sg page found! */ - - /* offset within this page */ - page_offset = r2t->data_offset - sg_count; - - /* fill in this buffer */ - iscsi_buf_init_sg(&r2t->sendbuf, sg); - r2t->sendbuf.sg.offset += page_offset; - r2t->sendbuf.sg.length -= page_offset; - - /* xmit logic will continue with next one */ - r2t->sg = sg + 1; - break; - } - sg_count += sg->length; - } - BUG_ON(r2t->sg == NULL); - } else - iscsi_buf_init_iov(&ctask->sendbuf, - (char*)sc->request_buffer + r2t->data_offset, - r2t->data_count); - - list_add(&dtask->item, &ctask->dataqueue); -} - -/** - * iscsi_r2t_rsp - iSCSI R2T Response processing - * @conn: iscsi connection - * @ctask: scsi command task - **/ -static int -iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_r2t_info *r2t; - struct iscsi_session *session = conn->session; - struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr; - int r2tsn = be32_to_cpu(rhdr->r2tsn); - int rc; - - if (conn->in.ahslen) - return ISCSI_ERR_AHSLEN; - - if (conn->in.datalen) - return ISCSI_ERR_DATALEN; - - if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn) - return ISCSI_ERR_R2TSN; - - rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); - if (rc) - return rc; - - /* FIXME: use R2TSN to detect missing R2T */ - - /* fill-in new R2T associated with the task */ - spin_lock(&session->lock); - if (!ctask->sc || ctask->mtask || - session->state != ISCSI_STATE_LOGGED_IN) { - printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " - "recovery...\n", ctask->itt); - spin_unlock(&session->lock); - return 0; - } - rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); - BUG_ON(!rc); - - r2t->exp_statsn = rhdr->statsn; - r2t->data_length = be32_to_cpu(rhdr->data_length); - if (r2t->data_length == 0 || - r2t->data_length > session->max_burst) { - spin_unlock(&session->lock); - return ISCSI_ERR_DATALEN; - } - - r2t->data_offset = be32_to_cpu(rhdr->data_offset); - if (r2t->data_offset + r2t->data_length > ctask->total_length) { - spin_unlock(&session->lock); - return ISCSI_ERR_DATALEN; - } - - r2t->ttt = rhdr->ttt; /* no flip */ - r2t->solicit_datasn = 0; - - iscsi_solicit_data_init(conn, ctask, r2t); - - ctask->exp_r2tsn = r2tsn + 1; - ctask->xmstate |= XMSTATE_SOL_HDR; - __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*)); - __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*)); - - scsi_queue_work(session->host, &conn->xmitwork); - conn->r2t_pdus_cnt++; - spin_unlock(&session->lock); - - return 0; -} - -static int -iscsi_hdr_recv(struct iscsi_conn *conn) -{ - int rc = 0; - struct iscsi_hdr *hdr; - struct iscsi_cmd_task *ctask; - struct iscsi_session *session = conn->session; - uint32_t cdgst, rdgst = 0; - - hdr = conn->in.hdr; - - /* verify PDU length */ - conn->in.datalen = ntoh24(hdr->dlength); - if (conn->in.datalen > conn->max_recv_dlength) { - printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", - conn->in.datalen, conn->max_recv_dlength); - return ISCSI_ERR_DATALEN; - } - conn->data_copied = 0; - - /* read AHS */ - conn->in.ahslen = hdr->hlength * 4; - conn->in.offset += conn->in.ahslen; - conn->in.copy -= conn->in.ahslen; - if (conn->in.copy < 0) { - printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " - "%d bytes\n", conn->in.ahslen); - return ISCSI_ERR_AHSLEN; - } - - /* calculate read padding */ - conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1); - if (conn->in.padding) { - conn->in.padding = ISCSI_PAD_LEN - conn->in.padding; - debug_scsi("read padding %d bytes\n", conn->in.padding); - } - - if (conn->hdrdgst_en) { - struct scatterlist sg; - - sg_init_one(&sg, (u8 *)hdr, - sizeof(struct iscsi_hdr) + conn->in.ahslen); - crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst); - rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + - conn->in.ahslen); - if (cdgst != rdgst) { - printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error " - "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst, - cdgst); - return ISCSI_ERR_HDR_DGST; - } - } - - /* save opcode for later */ - conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK; - - /* verify itt (itt encoding: age+cid+itt) */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - if ((hdr->itt & AGE_MASK) != - (session->age << AGE_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x expected " - "session age (%x)\n", hdr->itt, - session->age & AGE_MASK); - return ISCSI_ERR_BAD_ITT; - } - - if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x, expected " - "CID (%x)\n", hdr->itt, conn->id); - return ISCSI_ERR_BAD_ITT; - } - conn->in.itt = hdr->itt & ITT_MASK; - } else - conn->in.itt = hdr->itt; - - debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", - hdr->opcode, conn->in.offset, conn->in.copy, - conn->in.ahslen, conn->in.datalen); - - if (conn->in.itt < session->cmds_max) { - ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt]; - - if (!ctask->sc) { - printk(KERN_INFO "iscsi_tcp: dropping ctask with " - "itt 0x%x\n", ctask->itt); - conn->in.datalen = 0; /* force drop */ - return 0; - } - - if (ctask->sc->SCp.phase != session->age) { - printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " - "expected %d\n", ctask->sc->SCp.phase, - session->age); - return ISCSI_ERR_SESSION_FAILED; - } - - conn->in.ctask = ctask; - - debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n", - hdr->opcode, conn->id, (long)ctask->sc, - ctask->itt, conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_SCSI_CMD_RSP: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (!conn->in.datalen) - rc = iscsi_cmd_rsp(conn, ctask); - else - /* - * got sense or response data; copying PDU - * Header to the connection's header - * placeholder - */ - memcpy(&conn->hdr, hdr, - sizeof(struct iscsi_hdr)); - break; - case ISCSI_OP_SCSI_DATA_IN: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - /* save flags for non-exceptional status */ - conn->in.flags = hdr->flags; - /* save cmd_status for sense data */ - conn->in.cmd_status = - ((struct iscsi_data_rsp*)hdr)->cmd_status; - rc = iscsi_data_rsp(conn, ctask); - break; - case ISCSI_OP_R2T: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) - rc = iscsi_r2t_rsp(conn, ctask); - else - rc = ISCSI_ERR_PROTO; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET && - conn->in.itt < ISCSI_MGMT_ITT_OFFSET + - session->mgmtpool_max) { - struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - - debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", - conn->in.opcode, conn->id, mtask->itt, - conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_TEXT_RSP: - case ISCSI_OP_LOGOUT_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - - if (!conn->in.datalen) { - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_SCSI_TMFUNC_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - - if (conn->in.datalen || conn->in.ahslen) { - rc = ISCSI_ERR_PROTO; - break; - } - conn->tmfrsp_pdus_cnt++; - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmabort_state = - ((struct iscsi_tm_rsp *)hdr)-> - response == ISCSI_TMF_RSP_COMPLETE ? - TMABORT_SUCCESS:TMABORT_FAILED; - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); - break; - case ISCSI_OP_NOOP_IN: - if (hdr->ttt != ISCSI_RESERVED_TAG) { - rc = ISCSI_ERR_PROTO; - break; - } - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; - - if (!conn->in.datalen) { - struct iscsi_mgmt_task *mtask; - - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt == ISCSI_RESERVED_TAG) { - switch(conn->in.opcode) { - case ISCSI_OP_NOOP_IN: - if (!conn->in.datalen) { - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) - rc = iscsi_recv_pdu(conn->cls_conn, - hdr, NULL, 0); - } else - rc = ISCSI_ERR_PROTO; - break; - case ISCSI_OP_REJECT: - /* we need sth like iscsi_reject_rsp()*/ - case ISCSI_OP_ASYNC_EVENT: - /* we need sth like iscsi_async_event_rsp() */ - rc = ISCSI_ERR_BAD_OPCODE; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else - rc = ISCSI_ERR_BAD_ITT; - - return rc; -} - -/** - * iscsi_ctask_copy - copy skb bits to the destanation cmd task - * @conn: iscsi connection - * @ctask: scsi command task - * @buf: buffer to copy to - * @buf_size: size of buffer - * @offset: offset within the buffer - * - * Notes: - * The function calls skb_copy_bits() and updates per-connection and - * per-cmd byte counters. - * - * Read counters (in bytes): - * - * conn->in.offset offset within in progress SKB - * conn->in.copy left to copy from in progress SKB - * including padding - * conn->in.copied copied already from in progress SKB - * conn->data_copied copied already from in progress buffer - * ctask->sent total bytes sent up to the MidLayer - * ctask->data_count left to copy from in progress Data-In - * buf_left left to copy from in progress buffer - **/ -static inline int -iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - void *buf, int buf_size, int offset) -{ - int buf_left = buf_size - (conn->data_copied + offset); - int size = min(conn->in.copy, buf_left); - int rc; - - size = min(size, ctask->data_count); - - debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->in.copied); - - BUG_ON(size <= 0); - BUG_ON(ctask->sent + size > ctask->total_length); - - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + (offset + conn->data_copied), size); - /* must fit into skb->len */ - BUG_ON(rc); - - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; - ctask->sent += size; - ctask->data_count -= size; - - BUG_ON(conn->in.copy < 0); - BUG_ON(ctask->data_count < 0); - - if (buf_size != (conn->data_copied + offset)) { - if (!ctask->data_count) { - BUG_ON(buf_size - conn->data_copied < 0); - /* done with this PDU */ - return buf_size - conn->data_copied; - } - return -EAGAIN; - } - - /* done with this buffer or with both - PDU and buffer */ - conn->data_copied = 0; - return 0; -} - -/** - * iscsi_tcp_copy - copy skb bits to the destanation buffer - * @conn: iscsi connection - * @buf: buffer to copy to - * @buf_size: number of bytes to copy - * - * Notes: - * The function calls skb_copy_bits() and updates per-connection - * byte counters. - **/ -static inline int -iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size) -{ - int buf_left = buf_size - conn->data_copied; - int size = min(conn->in.copy, buf_left); - int rc; - - debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->data_copied); - BUG_ON(size <= 0); - - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + conn->data_copied, size); - BUG_ON(rc); - - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; - - if (buf_size != conn->data_copied) - return -EAGAIN; - - return 0; -} - -static inline void -partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg, - int offset, int length) -{ - struct scatterlist temp; - - memcpy(&temp, sg, sizeof(struct scatterlist)); - temp.offset = offset; - temp.length = length; - crypto_digest_update(conn->data_rx_tfm, &temp, 1); -} - -static void -iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len) -{ - struct scatterlist tmp; - - sg_init_one(&tmp, buf, len); - crypto_digest_update(conn->data_rx_tfm, &tmp, 1); -} - -static int iscsi_scsi_data_in(struct iscsi_conn *conn) -{ - struct iscsi_cmd_task *ctask = conn->in.ctask; - struct scsi_cmnd *sc = ctask->sc; - struct scatterlist *sg; - int i, offset, rc = 0; - - BUG_ON((void*)ctask != sc->SCp.ptr); - - /* - * copying Data-In into the Scsi_Cmnd - */ - if (!sc->use_sg) { - i = ctask->data_count; - rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer, - sc->request_bufflen, ctask->data_offset); - if (rc == -EAGAIN) - return rc; - if (conn->datadgst_en) - iscsi_recv_digest_update(conn, sc->request_buffer, i); - rc = 0; - goto done; - } - - offset = ctask->data_offset; - sg = sc->request_buffer; - - if (ctask->data_offset) - for (i = 0; i < ctask->sg_count; i++) - offset -= sg[i].length; - /* we've passed through partial sg*/ - if (offset < 0) - offset = 0; - - for (i = ctask->sg_count; i < sc->use_sg; i++) { - char *dest; - - dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); - rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset, - sg[i].length, offset); - kunmap_atomic(dest, KM_SOFTIRQ0); - if (rc == -EAGAIN) - /* continue with the next SKB/PDU */ - return rc; - if (!rc) { - if (conn->datadgst_en) { - if (!offset) - crypto_digest_update(conn->data_rx_tfm, - &sg[i], 1); - else - partial_sg_digest_update(conn, &sg[i], - sg[i].offset + offset, - sg[i].length - offset); - } - offset = 0; - ctask->sg_count++; - } - - if (!ctask->data_count) { - if (rc && conn->datadgst_en) - /* - * data-in is complete, but buffer not... - */ - partial_sg_digest_update(conn, &sg[i], - sg[i].offset, sg[i].length-rc); - rc = 0; - break; - } - - if (!conn->in.copy) - return -EAGAIN; - } - BUG_ON(ctask->data_count); - -done: - /* check for non-exceptional status */ - if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) { - debug_scsi("done [sc %lx res %d itt 0x%x]\n", - (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); - } - - return rc; -} - -static int -iscsi_data_recv(struct iscsi_conn *conn) -{ - struct iscsi_session *session = conn->session; - int rc = 0; - - switch(conn->in.opcode) { - case ISCSI_OP_SCSI_DATA_IN: - rc = iscsi_scsi_data_in(conn); - break; - case ISCSI_OP_SCSI_CMD_RSP: { - /* - * SCSI Sense Data: - * copying the entire Data Segment. - */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { - rc = -EAGAIN; - goto exit; - } - - /* - * check for sense - */ - conn->in.hdr = &conn->hdr; - conn->senselen = (conn->data[0] << 8) | conn->data[1]; - rc = iscsi_cmd_rsp(conn, conn->in.ctask); - if (!rc && conn->datadgst_en) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - } - break; - case ISCSI_OP_TEXT_RSP: - case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_NOOP_IN: { - struct iscsi_mgmt_task *mtask = NULL; - - if (conn->in.itt != ISCSI_RESERVED_TAG) - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - - /* - * Collect data segment to the connection's data - * placeholder - */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { - rc = -EAGAIN; - goto exit; - } - - rc = iscsi_recv_pdu(conn->cls_conn, conn->in.hdr, - conn->data, conn->in.datalen); - - if (!rc && conn->datadgst_en && - conn->in.opcode != ISCSI_OP_LOGIN_RSP) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - - if (mtask && conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_ASYNC_EVENT: - case ISCSI_OP_REJECT: - default: - BUG_ON(1); - } -exit: - return rc; -} - -/** - * iscsi_tcp_data_recv - TCP receive in sendfile fashion - * @rd_desc: read descriptor - * @skb: socket buffer - * @offset: offset in skb - * @len: skb->len - offset - **/ -static int -iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, - unsigned int offset, size_t len) -{ - int rc; - struct iscsi_conn *conn = rd_desc->arg.data; - int processed; - char pad[ISCSI_PAD_LEN]; - struct scatterlist sg; - - /* - * Save current SKB and its offset in the corresponding - * connection context. - */ - conn->in.copy = skb->len - offset; - conn->in.offset = offset; - conn->in.skb = skb; - conn->in.len = conn->in.copy; - BUG_ON(conn->in.copy <= 0); - debug_tcp("in %d bytes\n", conn->in.copy); - -more: - conn->in.copied = 0; - rc = 0; - - if (unlikely(conn->suspend_rx)) { - debug_tcp("conn %d Rx suspended!\n", conn->id); - return 0; - } - - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER || - conn->in_progress == IN_PROGRESS_HEADER_GATHER) { - rc = iscsi_hdr_extract(conn); - if (rc) { - if (rc == -EAGAIN) - goto nomore; - else { - iscsi_conn_failure(conn, rc); - return 0; - } - } - - /* - * Verify and process incoming PDU header. - */ - rc = iscsi_hdr_recv(conn); - if (!rc && conn->in.datalen) { - if (conn->datadgst_en) { - BUG_ON(!conn->data_rx_tfm); - crypto_digest_init(conn->data_rx_tfm); - } - conn->in_progress = IN_PROGRESS_DATA_RECV; - } else if (rc) { - iscsi_conn_failure(conn, rc); - return 0; - } - } - - if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { - uint32_t recv_digest; - debug_tcp("extra data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); - skb_copy_bits(conn->in.skb, conn->in.offset, - &recv_digest, 4); - conn->in.offset += 4; - conn->in.copy -= 4; - if (recv_digest != conn->in.datadgst) { - debug_tcp("iscsi_tcp: data digest error!" - "0x%x != 0x%x\n", recv_digest, - conn->in.datadgst); - iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); - return 0; - } else { - debug_tcp("iscsi_tcp: data digest match!" - "0x%x == 0x%x\n", recv_digest, - conn->in.datadgst); - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - } - } - - if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) { - - debug_tcp("data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); - - rc = iscsi_data_recv(conn); - if (rc) { - if (rc == -EAGAIN) { - rd_desc->count = conn->in.datalen - - conn->in.ctask->data_count; - goto again; - } - iscsi_conn_failure(conn, rc); - return 0; - } - conn->in.copy -= conn->in.padding; - conn->in.offset += conn->in.padding; - if (conn->datadgst_en) { - if (conn->in.padding) { - debug_tcp("padding -> %d\n", conn->in.padding); - memset(pad, 0, conn->in.padding); - sg_init_one(&sg, pad, conn->in.padding); - crypto_digest_update(conn->data_rx_tfm, &sg, 1); - } - crypto_digest_final(conn->data_rx_tfm, - (u8 *) & conn->in.datadgst); - debug_tcp("rx digest 0x%x\n", conn->in.datadgst); - conn->in_progress = IN_PROGRESS_DDIGEST_RECV; - } else - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - } - - debug_tcp("f, processed %d from out of %d padding %d\n", - conn->in.offset - offset, (int)len, conn->in.padding); - BUG_ON(conn->in.offset - offset > len); - - if (conn->in.offset - offset != len) { - debug_tcp("continue to process %d bytes\n", - (int)len - (conn->in.offset - offset)); - goto more; - } - -nomore: - processed = conn->in.offset - offset; - BUG_ON(processed == 0); - return processed; - -again: - processed = conn->in.offset - offset; - debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", - processed, (int)len, (int)rd_desc->count); - BUG_ON(processed == 0); - BUG_ON(processed > len); - - conn->rxdata_octets += processed; - return processed; -} - -static void -iscsi_tcp_data_ready(struct sock *sk, int flag) -{ - struct iscsi_conn *conn = sk->sk_user_data; - read_descriptor_t rd_desc; - - read_lock(&sk->sk_callback_lock); - - /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */ - rd_desc.arg.data = conn; - rd_desc.count = 0; - tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); - - read_unlock(&sk->sk_callback_lock); -} - -static void -iscsi_tcp_state_change(struct sock *sk) -{ - struct iscsi_conn *conn; - struct iscsi_session *session; - void (*old_state_change)(struct sock *); - - read_lock(&sk->sk_callback_lock); - - conn = (struct iscsi_conn*)sk->sk_user_data; - session = conn->session; - - if ((sk->sk_state == TCP_CLOSE_WAIT || - sk->sk_state == TCP_CLOSE) && - !atomic_read(&sk->sk_rmem_alloc)) { - debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - } - - old_state_change = conn->old_state_change; - - read_unlock(&sk->sk_callback_lock); - - old_state_change(sk); -} - -/** - * iscsi_write_space - Called when more output buffer space is available - * @sk: socket space is available for - **/ -static void -iscsi_write_space(struct sock *sk) -{ - struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; - conn->old_write_space(sk); - debug_tcp("iscsi_write_space: cid %d\n", conn->id); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - scsi_queue_work(conn->session->host, &conn->xmitwork); -} - -static void -iscsi_conn_set_callbacks(struct iscsi_conn *conn) -{ - struct sock *sk = conn->sock->sk; - - /* assign new callbacks */ - write_lock_bh(&sk->sk_callback_lock); - sk->sk_user_data = conn; - conn->old_data_ready = sk->sk_data_ready; - conn->old_state_change = sk->sk_state_change; - conn->old_write_space = sk->sk_write_space; - sk->sk_data_ready = iscsi_tcp_data_ready; - sk->sk_state_change = iscsi_tcp_state_change; - sk->sk_write_space = iscsi_write_space; - write_unlock_bh(&sk->sk_callback_lock); -} - -static void -iscsi_conn_restore_callbacks(struct iscsi_conn *conn) -{ - struct sock *sk = conn->sock->sk; - - /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ - write_lock_bh(&sk->sk_callback_lock); - sk->sk_user_data = NULL; - sk->sk_data_ready = conn->old_data_ready; - sk->sk_state_change = conn->old_state_change; - sk->sk_write_space = conn->old_write_space; - sk->sk_no_check = 0; - write_unlock_bh(&sk->sk_callback_lock); -} - -/** - * iscsi_send - generic send routine - * @sk: kernel's socket - * @buf: buffer to write from - * @size: actual size to write - * @flags: socket's flags - */ -static inline int -iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) -{ - struct socket *sk = conn->sock; - int offset = buf->sg.offset + buf->sent; - - /* - * if we got use_sg=0 or are sending something we kmallocd - * then we did not have to do kmap (kmap returns page_address) - * - * if we got use_sg > 0, but had to drop down, we do not - * set clustering so this should only happen for that - * slab case. - */ - if (buf->use_sendmsg) - return sock_no_sendpage(sk, buf->sg.page, offset, size, flags); - else - return conn->sendpage(sk, buf->sg.page, offset, size, flags); -} - -/** - * iscsi_sendhdr - send PDU Header via tcp_sendpage() - * @conn: iscsi connection - * @buf: buffer to write from - * @datalen: lenght of data to be sent after the header - * - * Notes: - * (Tx, Fast Path) - **/ -static inline int -iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) -{ - int flags = 0; /* MSG_DONTWAIT; */ - int res, size; - - size = buf->sg.length - buf->sent; - BUG_ON(buf->sent + size > buf->sg.length); - if (buf->sent + size != buf->sg.length || datalen) - flags |= MSG_MORE; - - res = iscsi_send(conn, buf, size, flags); - debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); - if (res >= 0) { - conn->txdata_octets += res; - buf->sent += res; - if (size != res) - return -EAGAIN; - return 0; - } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - } else if (res == -EPIPE) - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - - return res; -} - -/** - * iscsi_sendpage - send one page of iSCSI Data-Out. - * @conn: iscsi connection - * @buf: buffer to write from - * @count: remaining data - * @sent: number of bytes sent - * - * Notes: - * (Tx, Fast Path) - **/ -static inline int -iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, - int *count, int *sent) -{ - int flags = 0; /* MSG_DONTWAIT; */ - int res, size; - - size = buf->sg.length - buf->sent; - BUG_ON(buf->sent + size > buf->sg.length); - if (size > *count) - size = *count; - if (buf->sent + size != buf->sg.length || *count != size) - flags |= MSG_MORE; - - res = iscsi_send(conn, buf, size, flags); - debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", - size, buf->sent, *count, *sent, res); - if (res >= 0) { - conn->txdata_octets += res; - buf->sent += res; - *count -= res; - *sent += res; - if (size != res) - return -EAGAIN; - return 0; - } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - } else if (res == -EPIPE) - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - - return res; -} - -static inline void -iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - BUG_ON(!conn->data_tx_tfm); - crypto_digest_init(conn->data_tx_tfm); - ctask->digest_count = 4; -} - -static int -iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct iscsi_buf *buf, uint32_t *digest, int final) -{ - int rc = 0; - int sent = 0; - - if (final) - crypto_digest_final(conn->data_tx_tfm, (u8*)digest); - - iscsi_buf_init_virt(buf, (char*)digest, 4); - rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent); - if (rc) { - ctask->datadigest = *digest; - ctask->xmstate |= XMSTATE_DATA_DIGEST; - } else - ctask->digest_count = 4; - return rc; -} - -/** - * iscsi_solicit_data_cont - initialize next Data-Out - * @conn: iscsi connection - * @ctask: scsi command task - * @r2t: R2T info - * @left: bytes left to transfer - * - * Notes: - * Initialize next Data-Out within this R2T sequence and continue - * to process next Scatter-Gather element(if any) of this SCSI command. - * - * Called under connection lock. - **/ -static void -iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct iscsi_r2t_info *r2t, int left) -{ - struct iscsi_data *hdr; - struct iscsi_data_task *dtask; - struct scsi_cmnd *sc = ctask->sc; - int new_offset; - - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); - BUG_ON(!dtask); - INIT_LIST_HEAD(&dtask->item); - hdr = &dtask->hdr; - memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = r2t->ttt; - hdr->datasn = cpu_to_be32(r2t->solicit_datasn); - r2t->solicit_datasn++; - hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; - hdr->exp_statsn = r2t->exp_statsn; - new_offset = r2t->data_offset + r2t->sent; - hdr->offset = cpu_to_be32(new_offset); - if (left > conn->max_xmit_dlength) { - hton24(hdr->dlength, conn->max_xmit_dlength); - r2t->data_count = conn->max_xmit_dlength; - } else { - hton24(hdr->dlength, left); - r2t->data_count = left; - hdr->flags = ISCSI_FLAG_CMD_FINAL; - } - conn->dataout_pdus_cnt++; - - iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, - sizeof(struct iscsi_hdr)); - - r2t->dtask = dtask; - - if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); - iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); - r2t->sg += 1; - } else - iscsi_buf_init_iov(&ctask->sendbuf, - (char*)sc->request_buffer + new_offset, - r2t->data_count); - - list_add(&dtask->item, &ctask->dataqueue); -} - -static void -iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_data *hdr; - struct iscsi_data_task *dtask; - - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); - BUG_ON(!dtask); - INIT_LIST_HEAD(&dtask->item); - hdr = &dtask->hdr; - memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); - hdr->datasn = cpu_to_be32(ctask->unsol_datasn); - ctask->unsol_datasn++; - hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; - hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); - hdr->offset = cpu_to_be32(ctask->total_length - - ctask->r2t_data_count - - ctask->unsol_count); - if (ctask->unsol_count > conn->max_xmit_dlength) { - hton24(hdr->dlength, conn->max_xmit_dlength); - ctask->data_count = conn->max_xmit_dlength; - hdr->flags = 0; - } else { - hton24(hdr->dlength, ctask->unsol_count); - ctask->data_count = ctask->unsol_count; - hdr->flags = ISCSI_FLAG_CMD_FINAL; - } - - iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr, - sizeof(struct iscsi_hdr)); - - list_add(&dtask->item, &ctask->dataqueue); - - ctask->dtask = dtask; -} - -/** - * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands - * @conn: iscsi connection - * @ctask: scsi command task - * @sc: scsi command - **/ -static void -iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct scsi_cmnd *sc) -{ - struct iscsi_session *session = conn->session; - - BUG_ON(__kfifo_len(ctask->r2tqueue)); - - INIT_LIST_HEAD(&ctask->running); - ctask->sc = sc; - ctask->conn = conn; - ctask->hdr.opcode = ISCSI_OP_SCSI_CMD; - ctask->hdr.flags = ISCSI_ATTR_SIMPLE; - int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun); - ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen); - ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++; - ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn); - memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len); - memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); - - ctask->mtask = NULL; - ctask->sent = 0; - ctask->sg_count = 0; - - ctask->total_length = sc->request_bufflen; - - if (sc->sc_data_direction == DMA_TO_DEVICE) { - ctask->exp_r2tsn = 0; - ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE; - BUG_ON(ctask->total_length == 0); - if (sc->use_sg) { - struct scatterlist *sg = sc->request_buffer; - - iscsi_buf_init_sg(&ctask->sendbuf, - &sg[ctask->sg_count++]); - ctask->sg = sg; - ctask->bad_sg = sg + sc->use_sg; - } else { - iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer, - sc->request_bufflen); - } - - /* - * Write counters: - * - * imm_count bytes to be sent right after - * SCSI PDU Header - * - * unsol_count bytes(as Data-Out) to be sent - * without R2T ack right after - * immediate data - * - * r2t_data_count bytes to be sent via R2T ack's - * - * pad_count bytes to be sent as zero-padding - */ - ctask->imm_count = 0; - ctask->unsol_count = 0; - ctask->unsol_datasn = 0; - ctask->xmstate = XMSTATE_W_HDR; - /* calculate write padding */ - ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); - if (ctask->pad_count) { - ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count; - debug_scsi("write padding %d bytes\n", - ctask->pad_count); - ctask->xmstate |= XMSTATE_W_PAD; - } - if (session->imm_data_en) { - if (ctask->total_length >= session->first_burst) - ctask->imm_count = min(session->first_burst, - conn->max_xmit_dlength); - else - ctask->imm_count = min(ctask->total_length, - conn->max_xmit_dlength); - hton24(ctask->hdr.dlength, ctask->imm_count); - ctask->xmstate |= XMSTATE_IMM_DATA; - } else - zero_data(ctask->hdr.dlength); - - if (!session->initial_r2t_en) - ctask->unsol_count = min(session->first_burst, - ctask->total_length) - ctask->imm_count; - if (!ctask->unsol_count) - /* No unsolicit Data-Out's */ - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - else - ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; - - ctask->r2t_data_count = ctask->total_length - - ctask->imm_count - - ctask->unsol_count; - - debug_scsi("cmd [itt %x total %d imm %d imm_data %d " - "r2t_data %d]\n", - ctask->itt, ctask->total_length, ctask->imm_count, - ctask->unsol_count, ctask->r2t_data_count); - } else { - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - if (sc->sc_data_direction == DMA_FROM_DEVICE) - ctask->hdr.flags |= ISCSI_FLAG_CMD_READ; - ctask->datasn = 0; - ctask->xmstate = XMSTATE_R_HDR; - zero_data(ctask->hdr.dlength); - } - - iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr, - sizeof(struct iscsi_hdr)); - conn->scsicmd_pdus_cnt++; -} - -/** - * iscsi_mtask_xmit - xmit management(immediate) task - * @conn: iscsi connection - * @mtask: task management task - * - * Notes: - * The function can return -EAGAIN in which case caller must - * call it again later, or recover. '0' return code means successful - * xmit. - * - * Management xmit state machine consists of two states: - * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress - * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress - **/ -static int -iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) -{ - - debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", - conn->id, mtask->xmstate, mtask->itt); - - if (mtask->xmstate & XMSTATE_IMM_HDR) { - mtask->xmstate &= ~XMSTATE_IMM_HDR; - if (mtask->data_count) - mtask->xmstate |= XMSTATE_IMM_DATA; - if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && - conn->stop_stage != STOP_CONN_RECOVER && - conn->hdrdgst_en) - iscsi_hdr_digest(conn, &mtask->headbuf, - (u8*)mtask->hdrext); - if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) { - mtask->xmstate |= XMSTATE_IMM_HDR; - if (mtask->data_count) - mtask->xmstate &= ~XMSTATE_IMM_DATA; - return -EAGAIN; - } - } - - if (mtask->xmstate & XMSTATE_IMM_DATA) { - BUG_ON(!mtask->data_count); - mtask->xmstate &= ~XMSTATE_IMM_DATA; - /* FIXME: implement. - * Virtual buffer could be spreaded across multiple pages... - */ - do { - if (iscsi_sendpage(conn, &mtask->sendbuf, - &mtask->data_count, &mtask->sent)) { - mtask->xmstate |= XMSTATE_IMM_DATA; - return -EAGAIN; - } - } while (mtask->data_count); - } - - BUG_ON(mtask->xmstate != XMSTATE_IDLE); - return 0; -} - -static inline int -handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - ctask->xmstate &= ~XMSTATE_R_HDR; - if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) { - BUG_ON(ctask->xmstate != XMSTATE_IDLE); - return 0; /* wait for Data-In */ - } - ctask->xmstate |= XMSTATE_R_HDR; - return -EAGAIN; -} - -static inline int -handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - ctask->xmstate &= ~XMSTATE_W_HDR; - if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) { - ctask->xmstate |= XMSTATE_W_HDR; - return -EAGAIN; - } - return 0; -} - -static inline int -handle_xmstate_data_digest(struct iscsi_conn *conn, - struct iscsi_cmd_task *ctask) -{ - ctask->xmstate &= ~XMSTATE_DATA_DIGEST; - debug_tcp("resent data digest 0x%x\n", ctask->datadigest); - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->datadigest, 0)) { - ctask->xmstate |= XMSTATE_DATA_DIGEST; - debug_tcp("resent data digest 0x%x fail!\n", - ctask->datadigest); - return -EAGAIN; - } - return 0; -} - -static inline int -handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - BUG_ON(!ctask->imm_count); - ctask->xmstate &= ~XMSTATE_IMM_DATA; - - if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); - ctask->immdigest = 0; - } - - for (;;) { - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count, - &ctask->sent)) { - ctask->xmstate |= XMSTATE_IMM_DATA; - if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, - (u8*)&ctask->immdigest); - debug_tcp("tx imm sendpage fail 0x%x\n", - ctask->datadigest); - } - return -EAGAIN; - } - if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); - - if (!ctask->imm_count) - break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); - } - - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { - debug_tcp("sending imm digest 0x%x fail!\n", - ctask->immdigest); - return -EAGAIN; - } - debug_tcp("sending imm digest 0x%x\n", ctask->immdigest); - } - - return 0; -} - -static inline int -handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_data_task *dtask; - - ctask->xmstate |= XMSTATE_UNS_DATA; - if (ctask->xmstate & XMSTATE_UNS_INIT) { - iscsi_unsolicit_data_init(conn, ctask); - BUG_ON(!ctask->dtask); - dtask = ctask->dtask; - if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, - (u8*)dtask->hdrext); - ctask->xmstate &= ~XMSTATE_UNS_INIT; - } - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) { - ctask->xmstate &= ~XMSTATE_UNS_DATA; - ctask->xmstate |= XMSTATE_UNS_HDR; - return -EAGAIN; - } - - debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", - ctask->itt, ctask->unsol_count, ctask->sent); - return 0; -} - -static inline int -handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_data_task *dtask = ctask->dtask; - - BUG_ON(!ctask->data_count); - ctask->xmstate &= ~XMSTATE_UNS_DATA; - - if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); - dtask->digest = 0; - } - - for (;;) { - int start = ctask->sent; - - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count, - &ctask->sent)) { - ctask->unsol_count -= ctask->sent - start; - ctask->xmstate |= XMSTATE_UNS_DATA; - /* will continue with this ctask later.. */ - if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, - (u8 *)&dtask->digest); - debug_tcp("tx uns data fail 0x%x\n", - dtask->digest); - } - return -EAGAIN; - } - - BUG_ON(ctask->sent > ctask->total_length); - ctask->unsol_count -= ctask->sent - start; - - /* - * XXX:we may run here with un-initial sendbuf. - * so pass it - */ - if (conn->datadgst_en && ctask->sent - start > 0) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); - - if (!ctask->data_count) - break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); - } - BUG_ON(ctask->unsol_count < 0); - - /* - * Done with the Data-Out. Next, check if we need - * to send another unsolicited Data-Out. - */ - if (ctask->unsol_count) { - if (conn->datadgst_en) { - if (iscsi_digest_final_send(conn, ctask, - &dtask->digestbuf, - &dtask->digest, 1)) { - debug_tcp("send uns digest 0x%x fail\n", - dtask->digest); - return -EAGAIN; - } - debug_tcp("sending uns digest 0x%x, more uns\n", - dtask->digest); - } - ctask->xmstate |= XMSTATE_UNS_INIT; - return 1; - } - - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { - if (iscsi_digest_final_send(conn, ctask, - &dtask->digestbuf, - &dtask->digest, 1)) { - debug_tcp("send last uns digest 0x%x fail\n", - dtask->digest); - return -EAGAIN; - } - debug_tcp("sending uns digest 0x%x\n",dtask->digest); - } - - return 0; -} - -static inline int -handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_session *session = conn->session; - struct iscsi_r2t_info *r2t = ctask->r2t; - struct iscsi_data_task *dtask = r2t->dtask; - int left; - - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->dtask = dtask; - - if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); - dtask->digest = 0; - } -solicit_again: - /* - * send Data-Out whitnin this R2T sequence. - */ - if (!r2t->data_count) - goto data_out_done; - - if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { - ctask->xmstate |= XMSTATE_SOL_DATA; - /* will continue with this ctask later.. */ - if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, - (u8 *)&dtask->digest); - debug_tcp("r2t data send fail 0x%x\n", dtask->digest); - } - return -EAGAIN; - } - - BUG_ON(r2t->data_count < 0); - if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, &r2t->sendbuf.sg, 1); - - if (r2t->data_count) { - BUG_ON(ctask->sc->use_sg == 0); - if (!iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); - iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); - r2t->sg += 1; - } - goto solicit_again; - } - -data_out_done: - /* - * Done with this Data-Out. Next, check if we have - * to send another Data-Out for this R2T. - */ - BUG_ON(r2t->data_length - r2t->sent < 0); - left = r2t->data_length - r2t->sent; - if (left) { - if (conn->datadgst_en) { - if (iscsi_digest_final_send(conn, ctask, - &dtask->digestbuf, - &dtask->digest, 1)) { - debug_tcp("send r2t data digest 0x%x" - "fail\n", dtask->digest); - return -EAGAIN; - } - debug_tcp("r2t data send digest 0x%x\n", - dtask->digest); - } - iscsi_solicit_data_cont(conn, ctask, r2t, left); - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; - return 1; - } - - /* - * Done with this R2T. Check if there are more - * outstanding R2Ts ready to be processed. - */ - BUG_ON(ctask->r2t_data_count - r2t->data_length < 0); - if (conn->datadgst_en) { - if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, - &dtask->digest, 1)) { - debug_tcp("send last r2t data digest 0x%x" - "fail\n", dtask->digest); - return -EAGAIN; - } - debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); - } - - ctask->r2t_data_count -= r2t->data_length; - ctask->r2t = NULL; - spin_lock_bh(&session->lock); - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); - spin_unlock_bh(&session->lock); - if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { - ctask->r2t = r2t; - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; - return 1; - } - - return 0; -} - -static inline int -handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_data_task *dtask = ctask->dtask; - int sent; - - ctask->xmstate &= ~XMSTATE_W_PAD; - iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad, - ctask->pad_count); - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) { - ctask->xmstate |= XMSTATE_W_PAD; - return -EAGAIN; - } - - if (conn->datadgst_en) { - crypto_digest_update(conn->data_tx_tfm, &ctask->sendbuf.sg, 1); - /* imm data? */ - if (!dtask) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { - debug_tcp("send padding digest 0x%x" - "fail!\n", ctask->immdigest); - return -EAGAIN; - } - debug_tcp("done with padding, digest 0x%x\n", - ctask->datadigest); - } else { - if (iscsi_digest_final_send(conn, ctask, - &dtask->digestbuf, - &dtask->digest, 1)) { - debug_tcp("send padding digest 0x%x" - "fail\n", dtask->digest); - return -EAGAIN; - } - debug_tcp("done with padding, digest 0x%x\n", - dtask->digest); - } - } - - return 0; -} - -static int -iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - int rc = 0; - - debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", - conn->id, ctask->xmstate, ctask->itt); - - /* - * serialize with TMF AbortTask - */ - if (ctask->mtask) - return rc; - - if (ctask->xmstate & XMSTATE_R_HDR) { - rc = handle_xmstate_r_hdr(conn, ctask); - return rc; - } - - if (ctask->xmstate & XMSTATE_W_HDR) { - rc = handle_xmstate_w_hdr(conn, ctask); - if (rc) - return rc; - } - - /* XXX: for data digest xmit recover */ - if (ctask->xmstate & XMSTATE_DATA_DIGEST) { - rc = handle_xmstate_data_digest(conn, ctask); - if (rc) - return rc; - } - - if (ctask->xmstate & XMSTATE_IMM_DATA) { - rc = handle_xmstate_imm_data(conn, ctask); - if (rc) - return rc; - } - - if (ctask->xmstate & XMSTATE_UNS_HDR) { - BUG_ON(!ctask->unsol_count); - ctask->xmstate &= ~XMSTATE_UNS_HDR; -unsolicit_head_again: - rc = handle_xmstate_uns_hdr(conn, ctask); - if (rc) - return rc; - } - - if (ctask->xmstate & XMSTATE_UNS_DATA) { - rc = handle_xmstate_uns_data(conn, ctask); - if (rc == 1) - goto unsolicit_head_again; - else if (rc) - return rc; - goto done; - } - - if (ctask->xmstate & XMSTATE_SOL_HDR) { - struct iscsi_r2t_info *r2t; - - ctask->xmstate &= ~XMSTATE_SOL_HDR; - ctask->xmstate |= XMSTATE_SOL_DATA; - if (!ctask->r2t) - __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t, - sizeof(void*)); -solicit_head_again: - r2t = ctask->r2t; - if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &r2t->headbuf, - (u8*)r2t->dtask->hdrext); - if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->xmstate |= XMSTATE_SOL_HDR; - return -EAGAIN; - } - - debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", - r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, - r2t->sent); - } - - if (ctask->xmstate & XMSTATE_SOL_DATA) { - rc = handle_xmstate_sol_data(conn, ctask); - if (rc == 1) - goto solicit_head_again; - if (rc) - return rc; - } - -done: - /* - * Last thing to check is whether we need to send write - * padding. Note that we check for xmstate equality, not just the bit. - */ - if (ctask->xmstate == XMSTATE_W_PAD) - rc = handle_xmstate_w_pad(conn, ctask); - - return rc; -} - -/** - * iscsi_data_xmit - xmit any command into the scheduled connection - * @conn: iscsi connection - * - * Notes: - * The function can return -EAGAIN in which case the caller must - * re-schedule it again later or recover. '0' return code means - * successful xmit. - **/ -static int -iscsi_data_xmit(struct iscsi_conn *conn) -{ - if (unlikely(conn->suspend_tx)) { - debug_tcp("conn %d Tx suspended!\n", conn->id); - return 0; - } - - /* - * Transmit in the following order: - * - * 1) un-finished xmit (ctask or mtask) - * 2) immediate control PDUs - * 3) write data - * 4) SCSI commands - * 5) non-immediate control PDUs - * - * No need to lock around __kfifo_get as long as - * there's one producer and one consumer. - */ - - BUG_ON(conn->ctask && conn->mtask); - - if (conn->ctask) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - /* done with this in-progress ctask */ - conn->ctask = NULL; - } - if (conn->mtask) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - /* done with this in-progress mtask */ - conn->mtask = NULL; - } - - /* process immediate first */ - if (unlikely(__kfifo_len(conn->immqueue))) { - struct iscsi_session *session = conn->session; - while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - /* process write queue */ - while (__kfifo_get(conn->writequeue, (void*)&conn->ctask, - sizeof(void*))) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - - /* process command queue */ - while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, - sizeof(void*))) { - list_add_tail(&conn->ctask->running, &conn->run_list); - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - /* done with this ctask */ - conn->ctask = NULL; - - /* process the rest control plane PDUs, if any */ - if (unlikely(__kfifo_len(conn->mgmtqueue))) { - struct iscsi_session *session = conn->session; - - while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - return 0; - -again: - if (unlikely(conn->suspend_tx)) - return 0; - - return -EAGAIN; -} - -static void -iscsi_xmitworker(void *data) -{ - struct iscsi_conn *conn = data; - - /* - * serialize Xmit worker on a per-connection basis. - */ - mutex_lock(&conn->xmitmutex); - if (iscsi_data_xmit(conn)) - scsi_queue_work(conn->session->host, &conn->xmitwork); - mutex_unlock(&conn->xmitmutex); -} - -enum { - FAILURE_BAD_HOST = 1, - FAILURE_SESSION_FAILED, - FAILURE_SESSION_FREED, - FAILURE_WINDOW_CLOSED, - FAILURE_SESSION_TERMINATE, - FAILURE_SESSION_RECOVERY_TIMEOUT, -}; - -static int -iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) -{ - struct Scsi_Host *host; - int reason = 0; - struct iscsi_session *session; - struct iscsi_conn *conn = NULL; - struct iscsi_cmd_task *ctask = NULL; - - sc->scsi_done = done; - sc->result = 0; - - host = sc->device->host; - session = iscsi_hostdata(host->hostdata); - - spin_lock(&session->lock); - - if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->recovery_failed) { - reason = FAILURE_SESSION_RECOVERY_TIMEOUT; - goto fault; - } else if (session->state == ISCSI_STATE_FAILED) { - reason = FAILURE_SESSION_FAILED; - goto reject; - } else if (session->state == ISCSI_STATE_TERMINATE) { - reason = FAILURE_SESSION_TERMINATE; - goto fault; - } - reason = FAILURE_SESSION_FREED; - goto fault; - } - - /* - * Check for iSCSI window and take care of CmdSN wrap-around - */ - if ((int)(session->max_cmdsn - session->cmdsn) < 0) { - reason = FAILURE_WINDOW_CLOSED; - goto reject; - } - - conn = session->leadconn; - - __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - BUG_ON(ctask->sc); - - sc->SCp.phase = session->age; - sc->SCp.ptr = (char*)ctask; - iscsi_cmd_init(conn, ctask, sc); - - __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); - debug_scsi( - "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", - sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", - conn->id, (long)sc, ctask->itt, sc->request_bufflen, - session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); - spin_unlock(&session->lock); - - scsi_queue_work(host, &conn->xmitwork); - return 0; - -reject: - spin_unlock(&session->lock); - debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); - return SCSI_MLQUEUE_HOST_BUSY; - -fault: - spin_unlock(&session->lock); - printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", - sc->cmnd[0], reason); - sc->result = (DID_NO_CONNECT << 16); - sc->resid = sc->request_bufflen; - sc->scsi_done(sc); - return 0; -} - -static int -iscsi_change_queue_depth(struct scsi_device *sdev, int depth) -{ - if (depth > ISCSI_MAX_CMD_PER_LUN) - depth = ISCSI_MAX_CMD_PER_LUN; - scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); - return sdev->queue_depth; -} - -static int -iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) -{ - int i; - - *items = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (*items == NULL) - return -ENOMEM; - - q->max = max; - q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (q->pool == NULL) { - kfree(*items); - return -ENOMEM; - } - - q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), - GFP_KERNEL, NULL); - if (q->queue == ERR_PTR(-ENOMEM)) { - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - - for (i = 0; i < max; i++) { - q->pool[i] = kmalloc(item_size, GFP_KERNEL); - if (q->pool[i] == NULL) { - int j; - - for (j = 0; j < i; j++) - kfree(q->pool[j]); - - kfifo_free(q->queue); - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - memset(q->pool[i], 0, item_size); - (*items)[i] = q->pool[i]; - __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); - } - return 0; -} - -static void -iscsi_pool_free(struct iscsi_queue *q, void **items) -{ - int i; - - for (i = 0; i < q->max; i++) - kfree(items[i]); - kfree(q->pool); - kfree(items); -} - -static struct iscsi_cls_conn * -iscsi_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *conn; - struct iscsi_cls_conn *cls_conn; - - cls_conn = iscsi_create_conn(cls_session, conn_idx); - if (!cls_conn) - return NULL; - conn = cls_conn->dd_data; - memset(conn, 0, sizeof(*conn)); - - conn->cls_conn = cls_conn; - conn->c_stage = ISCSI_CONN_INITIAL_STAGE; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - conn->id = conn_idx; - conn->exp_statsn = 0; - conn->tmabort_state = TMABORT_INITIAL; - INIT_LIST_HEAD(&conn->run_list); - - /* initial operational parameters */ - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; - conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; - - /* initialize general xmit PDU commands queue */ - conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->xmitqueue == ERR_PTR(-ENOMEM)) - goto xmitqueue_alloc_fail; - - /* initialize write response PDU commands queue */ - conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->writequeue == ERR_PTR(-ENOMEM)) - goto writequeue_alloc_fail; - - /* initialize general immediate & non-immediate PDU commands queue */ - conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->immqueue == ERR_PTR(-ENOMEM)) - goto immqueue_alloc_fail; - - conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) - goto mgmtqueue_alloc_fail; - - INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); - - /* allocate login_mtask used for the login/text sequences */ - spin_lock_bh(&session->lock); - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&conn->login_mtask, - sizeof(void*))) { - spin_unlock_bh(&session->lock); - goto login_mtask_alloc_fail; - } - spin_unlock_bh(&session->lock); - - /* allocate initial PDU receive place holder */ - if (conn->data_size <= PAGE_SIZE) - conn->data = kmalloc(conn->data_size, GFP_KERNEL); - else - conn->data = (void*)__get_free_pages(GFP_KERNEL, - get_order(conn->data_size)); - if (!conn->data) - goto max_recv_dlenght_alloc_fail; - - init_timer(&conn->tmabort_timer); - mutex_init(&conn->xmitmutex); - init_waitqueue_head(&conn->ehwait); - - return cls_conn; - -max_recv_dlenght_alloc_fail: - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); -login_mtask_alloc_fail: - kfifo_free(conn->mgmtqueue); -mgmtqueue_alloc_fail: - kfifo_free(conn->immqueue); -immqueue_alloc_fail: - kfifo_free(conn->writequeue); -writequeue_alloc_fail: - kfifo_free(conn->xmitqueue); -xmitqueue_alloc_fail: - iscsi_destroy_conn(cls_conn); - return NULL; -} - -static void -iscsi_conn_destroy(struct iscsi_cls_conn *cls_conn) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - unsigned long flags; - - mutex_lock(&conn->xmitmutex); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) { - struct sock *sk = conn->sock->sk; - - /* - * conn_start() has never been called! - * need to cleanup the socket. - */ - write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - write_unlock_bh(&sk->sk_callback_lock); - - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - sock_release(conn->sock); - conn->sock = NULL; - } - - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; - if (session->leadconn == conn) { - /* - * leading connection? then give up on recovery. - */ - session->state = ISCSI_STATE_TERMINATE; - wake_up(&conn->ehwait); - } - spin_unlock_bh(&session->lock); - - mutex_unlock(&conn->xmitmutex); - - /* - * Block until all in-progress commands for this connection - * time out or fail. - */ - for (;;) { - spin_lock_irqsave(session->host->host_lock, flags); - if (!session->host->host_busy) { /* OK for ERL == 0 */ - spin_unlock_irqrestore(session->host->host_lock, flags); - break; - } - spin_unlock_irqrestore(session->host->host_lock, flags); - msleep_interruptible(500); - printk("conn_destroy(): host_busy %d host_failed %d\n", - session->host->host_busy, session->host->host_failed); - /* - * force eh_abort() to unblock - */ - wake_up(&conn->ehwait); - } - - /* now free crypto */ - if (conn->hdrdgst_en || conn->datadgst_en) { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); - } - - /* free conn->data, size = MaxRecvDataSegmentLength */ - if (conn->data_size <= PAGE_SIZE) - kfree(conn->data); - else - free_pages((unsigned long)conn->data, - get_order(conn->data_size)); - - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - list_del(&conn->item); - if (list_empty(&session->connections)) - session->leadconn = NULL; - if (session->leadconn && session->leadconn == conn) - session->leadconn = container_of(session->connections.next, - struct iscsi_conn, item); - - if (session->leadconn == NULL) - /* none connections exits.. reset sequencing */ - session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; - spin_unlock_bh(&session->lock); - - kfifo_free(conn->xmitqueue); - kfifo_free(conn->writequeue); - kfifo_free(conn->immqueue); - kfifo_free(conn->mgmtqueue); - - iscsi_destroy_conn(cls_conn); -} - -static int -iscsi_conn_bind(struct iscsi_cls_session *cls_session, - struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, - int is_leading) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; - struct sock *sk; - struct socket *sock; - int err; - - /* lookup for existing socket */ - sock = sockfd_lookup(transport_fd, &err); - if (!sock) { - printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); - return -EEXIST; - } - - /* lookup for existing connection */ - spin_lock_bh(&session->lock); - list_for_each_entry(tmp, &session->connections, item) { - if (tmp == conn) { - if (conn->c_stage != ISCSI_CONN_STOPPED || - conn->stop_stage == STOP_CONN_TERM) { - printk(KERN_ERR "iscsi_tcp: can't bind " - "non-stopped connection (%d:%d)\n", - conn->c_stage, conn->stop_stage); - spin_unlock_bh(&session->lock); - return -EIO; - } - break; - } - } - if (tmp != conn) { - /* bind new iSCSI connection to session */ - conn->session = session; - - list_add(&conn->item, &session->connections); - } - spin_unlock_bh(&session->lock); - - if (conn->stop_stage != STOP_CONN_SUSPEND) { - /* bind iSCSI connection and socket */ - conn->sock = sock; - - /* setup Socket parameters */ - sk = sock->sk; - sk->sk_reuse = 1; - sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ - sk->sk_allocation = GFP_ATOMIC; - - /* FIXME: disable Nagle's algorithm */ - - /* - * Intercept TCP callbacks for sendfile like receive - * processing. - */ - iscsi_conn_set_callbacks(conn); - - conn->sendpage = conn->sock->ops->sendpage; - - /* - * set receive state machine into initial state - */ - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - } - - if (is_leading) - session->leadconn = conn; - - /* - * Unblock xmitworker(), Login Phase will pass through. - */ - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - - return 0; -} - -static void -iscsi_session_recovery_timedout(struct iscsi_cls_session *csession) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(csession); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *conn = session->leadconn; - - spin_lock_bh(&session->lock); - if (session->state != ISCSI_STATE_LOGGED_IN) { - session->recovery_failed = 1; - if (conn) - wake_up(&conn->ehwait); - } - spin_unlock_bh(&session->lock); -} - -static int -iscsi_conn_start(struct iscsi_cls_conn *cls_conn) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - struct sock *sk; - - /* FF phase warming up... */ - - if (session == NULL) { - printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n"); - return -EPERM; - } - - sk = conn->sock->sk; - write_lock_bh(&sk->sk_callback_lock); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STARTED; - session->state = ISCSI_STATE_LOGGED_IN; - - switch(conn->stop_stage) { - case STOP_CONN_RECOVER: - /* - * unblock eh_abort() if it is blocked. re-try all - * commands after successful recovery - */ - session->conn_cnt++; - conn->stop_stage = 0; - conn->tmabort_state = TMABORT_INITIAL; - session->age++; - session->recovery_failed = 0; - spin_unlock_bh(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - - iscsi_unblock_session(session_to_cls(session)); - wake_up(&conn->ehwait); - return 0; - case STOP_CONN_TERM: - session->conn_cnt++; - conn->stop_stage = 0; - break; - case STOP_CONN_SUSPEND: - conn->stop_stage = 0; - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - break; - default: - break; - } - spin_unlock_bh(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - - return 0; -} - -static int -iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) -{ - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - struct iscsi_mgmt_task *mtask; - - if (!ctask->mtask) - return -EINVAL; - - while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == ctask->mtask) - break; - __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); - } - - __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, - sizeof(void*)); - ctask->mtask = NULL; - return 0; -} - -static void -fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, int err) -{ - struct iscsi_r2t_info *r2t; - struct scsi_cmnd *sc; - - /* flush ctask's r2t queues */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); - - iscsi_ctask_mtask_cleanup(ctask); - - sc = ctask->sc; - if (!sc) - return; - - sc->result = err; - sc->resid = sc->request_bufflen; - - __iscsi_ctask_cleanup(conn, ctask); -} - -/* Fail commands. Mutex and session lock held */ -static void -fail_all_commands(struct iscsi_session *session, struct iscsi_conn *conn) -{ - struct iscsi_cmd_task *ctask, *tmp; - - /* flush pending */ - while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) { - debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, - ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - /* fail running */ - list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { - debug_scsi("failing in progress sc %p itt 0x%x\n", - ctask->sc, ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - conn->ctask = NULL; -} - -static void -flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) -{ - struct iscsi_mgmt_task *mtask; - - /* TODO: handle running pdus */ - while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || - __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == conn->login_mtask) - continue; - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); - } - - if (conn->mtask && conn->mtask != conn->login_mtask) - __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, - sizeof(void*)); - conn->mtask = NULL; -} - -static void -iscsi_suspend_conn_rx(struct iscsi_conn *conn) -{ - struct sock *sk; - - BUG_ON(!conn->sock); - sk = conn->sock->sk; - write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - write_unlock_bh(&sk->sk_callback_lock); -} - -static void -iscsi_start_session_recovery(struct iscsi_session *session, - struct iscsi_conn *conn, int flag) -{ - spin_lock_bh(&session->lock); - if (conn->stop_stage == STOP_CONN_RECOVER || - conn->stop_stage == STOP_CONN_TERM) { - spin_unlock_bh(&session->lock); - return; - } - conn->stop_stage = flag; - spin_unlock_bh(&session->lock); - - iscsi_suspend_conn_rx(conn); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - - session->conn_cnt--; - if (session->conn_cnt == 0 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - - spin_unlock_bh(&session->lock); - - /* - * Socket must go now. - */ - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - - /* - * flush queues. - */ - spin_lock_bh(&session->lock); - fail_all_commands(session, conn); - flush_control_queues(session, conn); - spin_unlock_bh(&session->lock); - - /* - * release socket only after we stopped data_xmit() - * activity and flushed all outstandings - */ - sock_release(conn->sock); - conn->sock = NULL; - - /* - * for connection level recovery we should not calculate - * header digest. conn->hdr_size used for optimization - * in hdr_extract() and will be re-negotiated at - * set_param() time. - */ - if (flag == STOP_CONN_RECOVER) { - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->hdrdgst_en = 0; - conn->datadgst_en = 0; - - if (session->state == ISCSI_STATE_FAILED) - iscsi_block_session(session_to_cls(session)); - } - mutex_unlock(&conn->xmitmutex); -} - -static void -iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - - switch (flag) { - case STOP_CONN_RECOVER: - case STOP_CONN_TERM: - iscsi_start_session_recovery(session, conn, flag); - return; - case STOP_CONN_SUSPEND: - iscsi_suspend_conn_rx(conn); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - - conn->stop_stage = flag; - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - break; - default: - printk(KERN_ERR "invalid stop flag %d\n", flag); - } -} - -static int -iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) -{ - struct iscsi_session *session = conn->session; - struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; - struct iscsi_mgmt_task *mtask; - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { - spin_unlock_bh(&session->lock); - return -EPERM; - } - if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || - hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) - /* - * Login and Text are sent serially, in - * request-followed-by-response sequence. - * Same mtask can be used. Same ITT must be used. - * Note that login_mtask is preallocated at conn_create(). - */ - mtask = conn->login_mtask; - else { - BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); - BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); - - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*))) { - spin_unlock_bh(&session->lock); - return -ENOSPC; - } - } - - /* - * pre-format CmdSN and ExpStatSN for outgoing PDU. - */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - hdr->itt = mtask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - nop->cmdsn = cpu_to_be32(session->cmdsn); - if (conn->c_stage == ISCSI_CONN_STARTED && - !(hdr->opcode & ISCSI_OP_IMMEDIATE)) - session->cmdsn++; - } else - /* do not advance CmdSN */ - nop->cmdsn = cpu_to_be32(session->cmdsn); - - nop->exp_statsn = cpu_to_be32(conn->exp_statsn); - - memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr)); - - iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr, - sizeof(struct iscsi_hdr)); - - spin_unlock_bh(&session->lock); - - if (data_size) { - memcpy(mtask->data, data, data_size); - mtask->data_count = data_size; - } else - mtask->data_count = 0; - - mtask->xmstate = XMSTATE_IMM_HDR; - - if (mtask->data_count) { - iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data, - mtask->data_count); - } - - debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", - hdr->opcode, hdr->itt, data_size); - - /* - * since send_pdu() could be called at least from two contexts, - * we need to serialize __kfifo_put, so we don't have to take - * additional lock on fast data-path - */ - if (hdr->opcode & ISCSI_OP_IMMEDIATE) - __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); - else - __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); - - scsi_queue_work(session->host, &conn->xmitwork); - return 0; -} - -static int -iscsi_eh_host_reset(struct scsi_cmnd *sc) -{ - struct Scsi_Host *host = sc->device->host; - struct iscsi_session *session = iscsi_hostdata(host->hostdata); - struct iscsi_conn *conn = session->leadconn; - int fail_session = 0; - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { -failed: - debug_scsi("failing host reset: session terminated " - "[CID %d age %d]", conn->id, session->age); - spin_unlock_bh(&session->lock); - return FAILED; - } - - if (sc->SCp.phase == session->age) { - debug_scsi("failing connection CID %d due to SCSI host reset", - conn->id); - fail_session = 1; - } - spin_unlock_bh(&session->lock); - - /* - * we drop the lock here but the leadconn cannot be destoyed while - * we are in the scsi eh - */ - if (fail_session) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - /* - * if userspace cannot respond then we must kick this off - * here for it - */ - iscsi_start_session_recovery(session, conn, STOP_CONN_RECOVER); - } - - debug_scsi("iscsi_eh_host_reset wait for relogin\n"); - wait_event_interruptible(conn->ehwait, - session->state == ISCSI_STATE_TERMINATE || - session->state == ISCSI_STATE_LOGGED_IN || - session->recovery_failed); - if (signal_pending(current)) - flush_signals(current); - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_LOGGED_IN) - printk(KERN_INFO "host reset succeeded\n"); - else - goto failed; - spin_unlock_bh(&session->lock); - - return SUCCESS; -} - -static void -iscsi_tmabort_timedout(unsigned long data) -{ - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmabort_state = TMABORT_TIMEDOUT; - debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", - (long)ctask->sc, ctask->itt); - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); -} - -/* must be called with the mutex lock */ -static int -iscsi_exec_abort_task(struct scsi_cmnd *sc, struct iscsi_cmd_task *ctask) -{ - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - struct iscsi_tm *hdr = &conn->tmhdr; - int rc; - - /* - * ctask timed out but session is OK requests must be serialized. - */ - memset(hdr, 0, sizeof(struct iscsi_tm)); - hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; - hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; - hdr->flags |= ISCSI_FLAG_CMD_FINAL; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->rtt = ctask->hdr.itt; - hdr->refcmdsn = ctask->hdr.cmdsn; - - rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (rc) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); - return rc; - } - - debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); - - spin_lock_bh(&session->lock); - ctask->mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[(hdr->itt & ITT_MASK) - - ISCSI_MGMT_ITT_OFFSET]; - - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmfcmd_pdus_cnt++; - conn->tmabort_timer.expires = 10*HZ + jiffies; - conn->tmabort_timer.function = iscsi_tmabort_timedout; - conn->tmabort_timer.data = (unsigned long)ctask; - add_timer(&conn->tmabort_timer); - debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); - } - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - - /* - * block eh thread until: - * - * 1) abort response - * 2) abort timeout - * 3) session is terminated or restarted or userspace has - * given up on recovery - */ - wait_event_interruptible(conn->ehwait, - sc->SCp.phase != session->age || - session->state != ISCSI_STATE_LOGGED_IN || - conn->tmabort_state != TMABORT_INITIAL || - session->recovery_failed); - if (signal_pending(current)) - flush_signals(current); - del_timer_sync(&conn->tmabort_timer); - - mutex_lock(&conn->xmitmutex); - return 0; -} - -static int -iscsi_eh_abort(struct scsi_cmnd *sc) -{ - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - struct iscsi_cmd_task *tmp_ctask; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - int rc; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - - /* - * If we are not logged in or we have started a new session - * then let the host reset code handle this - */ - if (session->state != ISCSI_STATE_LOGGED_IN || - sc->SCp.phase != session->age) - goto failed; - - /* ctask completed before time out */ - if (!ctask->sc) - goto success; - - /* what should we do here ? */ - if (conn->ctask == ctask) { - printk(KERN_INFO "sc %p itt 0x%x partially sent. Failing " - "abort\n", sc, ctask->itt); - goto failed; - } - - /* check for the easy pending cmd abort */ - while (__kfifo_get(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*))) { - if (tmp_ctask->itt == ctask->itt) { - debug_scsi("found pending task\n"); - goto success; - } - __kfifo_put(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*)); - } - - conn->tmabort_state = TMABORT_INITIAL; - - spin_unlock_bh(&session->lock); - rc = iscsi_exec_abort_task(sc, ctask); - spin_lock_bh(&session->lock); - - iscsi_ctask_mtask_cleanup(ctask); - if (rc || sc->SCp.phase != session->age || - session->state != ISCSI_STATE_LOGGED_IN) - goto failed; - - /* ctask completed before tmf abort response */ - if (!ctask->sc) { - debug_scsi("sc completed while abort in progress\n"); - goto success; - } - - if (conn->tmabort_state != TMABORT_SUCCESS) { - spin_unlock_bh(&session->lock); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - spin_lock_bh(&session->lock); - goto failed; - } - -success: - debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - spin_unlock_bh(&session->lock); - - /* clean up task if aborted */ - if (conn->sock) { - struct sock *sk = conn->sock->sk; - - write_lock_bh(&sk->sk_callback_lock); - spin_lock(&session->lock); - fail_command(conn, ctask, DRIVER_TIMEOUT << 24); - spin_unlock(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - } - mutex_unlock(&conn->xmitmutex); - return SUCCESS; - -failed: - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - return FAILED; -} - -static int -iscsi_r2tpool_alloc(struct iscsi_session *session) -{ - int i; - int cmd_i; - - /* - * initialize per-task: R2T pool and xmit queue - */ - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { - struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; - - /* - * pre-allocated x4 as much r2ts to handle race when - * target acks DataOut faster than we data_xmit() queues - * could replenish r2tqueue. - */ - - /* R2T pool */ - if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4, - (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) { - goto r2t_alloc_fail; - } - - /* R2T xmit queue */ - ctask->r2tqueue = kfifo_alloc( - session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); - if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) { - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); - goto r2t_alloc_fail; - } - - /* - * number of - * Data-Out PDU's within R2T-sequence can be quite big; - * using mempool - */ - ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, - taskcache); - if (ctask->datapool == NULL) { - kfifo_free(ctask->r2tqueue); - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); - goto r2t_alloc_fail; - } - INIT_LIST_HEAD(&ctask->dataqueue); - } - - return 0; - -r2t_alloc_fail: - for (i = 0; i < cmd_i; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); - } - return -ENOMEM; -} - -static void -iscsi_r2tpool_free(struct iscsi_session *session) -{ - int i; - - for (i = 0; i < session->cmds_max; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); - } -} - -static struct scsi_host_template iscsi_sht = { - .name = "iSCSI Initiator over TCP/IP, v." - ISCSI_VERSION_STR, - .queuecommand = iscsi_queuecommand, - .change_queue_depth = iscsi_change_queue_depth, - .can_queue = ISCSI_XMIT_CMDS_MAX - 1, - .sg_tablesize = ISCSI_SG_TABLESIZE, - .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, - .eh_abort_handler = iscsi_eh_abort, - .eh_host_reset_handler = iscsi_eh_host_reset, - .use_clustering = DISABLE_CLUSTERING, - .proc_name = "iscsi_tcp", - .this_id = -1, -}; - -static struct iscsi_transport iscsi_tcp_transport; - -static struct iscsi_cls_session * -iscsi_session_create(struct scsi_transport_template *scsit, - uint32_t initial_cmdsn, uint32_t *hostno) -{ - struct Scsi_Host *shost; - struct iscsi_session *session; - int cmd_i; - - shost = iscsi_transport_create_session(scsit, &iscsi_tcp_transport); - if (!shost) - return NULL; - - session = iscsi_hostdata(shost->hostdata); - memset(session, 0, sizeof(struct iscsi_session)); - session->host = shost; - session->state = ISCSI_STATE_FREE; - session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; - session->cmds_max = ISCSI_XMIT_CMDS_MAX; - session->cmdsn = initial_cmdsn; - session->exp_cmdsn = initial_cmdsn + 1; - session->max_cmdsn = initial_cmdsn + 1; - session->max_r2t = 1; - - *hostno = shost->host_no; - - /* initialize SCSI PDU commands pool */ - if (iscsi_pool_init(&session->cmdpool, session->cmds_max, - (void***)&session->cmds, sizeof(struct iscsi_cmd_task))) - goto cmdpool_alloc_fail; - - /* pre-format cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) - session->cmds[cmd_i]->itt = cmd_i; - - spin_lock_init(&session->lock); - INIT_LIST_HEAD(&session->connections); - - /* initialize immediate command pool */ - if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, - (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task))) - goto mgmtpool_alloc_fail; - - - /* pre-format immediate cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { - session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; - session->mgmt_cmds[cmd_i]->data = kmalloc( - DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); - if (!session->mgmt_cmds[cmd_i]->data) { - int j; - - for (j = 0; j < cmd_i; j++) - kfree(session->mgmt_cmds[j]->data); - goto immdata_alloc_fail; - } - } - - if (iscsi_r2tpool_alloc(session)) - goto r2tpool_alloc_fail; - - return hostdata_session(shost->hostdata); - -r2tpool_alloc_fail: - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); -immdata_alloc_fail: - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); -mgmtpool_alloc_fail: - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); -cmdpool_alloc_fail: - iscsi_transport_destroy_session(shost); - return NULL; -} - -static void -iscsi_session_destroy(struct iscsi_cls_session *cls_session) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - int cmd_i; - struct iscsi_data_task *dtask, *n; - - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { - struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { - list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); - } - } - - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); - - iscsi_r2tpool_free(session); - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); - - iscsi_transport_destroy_session(shost); -} - -static int -iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, - uint32_t value) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - - switch(param) { - case ISCSI_PARAM_MAX_RECV_DLENGTH: { - char *saveptr = conn->data; - gfp_t flags = GFP_KERNEL; - - if (conn->data_size >= value) { - conn->max_recv_dlength = value; - break; - } - - spin_lock_bh(&session->lock); - if (conn->stop_stage == STOP_CONN_RECOVER) - flags = GFP_ATOMIC; - spin_unlock_bh(&session->lock); - - if (value <= PAGE_SIZE) - conn->data = kmalloc(value, flags); - else - conn->data = (void*)__get_free_pages(flags, - get_order(value)); - if (conn->data == NULL) { - conn->data = saveptr; - return -ENOMEM; - } - if (conn->data_size <= PAGE_SIZE) - kfree(saveptr); - else - free_pages((unsigned long)saveptr, - get_order(conn->data_size)); - conn->max_recv_dlength = value; - conn->data_size = value; - } - break; - case ISCSI_PARAM_MAX_XMIT_DLENGTH: - conn->max_xmit_dlength = value; - break; - case ISCSI_PARAM_HDRDGST_EN: - conn->hdrdgst_en = value; - conn->hdr_size = sizeof(struct iscsi_hdr); - if (conn->hdrdgst_en) { - conn->hdr_size += sizeof(__u32); - if (!conn->tx_tfm) - conn->tx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->tx_tfm) - return -ENOMEM; - if (!conn->rx_tfm) - conn->rx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->rx_tfm) { - crypto_free_tfm(conn->tx_tfm); - return -ENOMEM; - } - } else { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); - } - break; - case ISCSI_PARAM_DATADGST_EN: - conn->datadgst_en = value; - if (conn->datadgst_en) { - if (!conn->data_tx_tfm) - conn->data_tx_tfm = - crypto_alloc_tfm("crc32c", 0); - if (!conn->data_tx_tfm) - return -ENOMEM; - if (!conn->data_rx_tfm) - conn->data_rx_tfm = - crypto_alloc_tfm("crc32c", 0); - if (!conn->data_rx_tfm) { - crypto_free_tfm(conn->data_tx_tfm); - return -ENOMEM; - } - } else { - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); - } - conn->sendpage = conn->datadgst_en ? - sock_no_sendpage : conn->sock->ops->sendpage; - break; - case ISCSI_PARAM_INITIAL_R2T_EN: - session->initial_r2t_en = value; - break; - case ISCSI_PARAM_MAX_R2T: - if (session->max_r2t == roundup_pow_of_two(value)) - break; - iscsi_r2tpool_free(session); - session->max_r2t = value; - if (session->max_r2t & (session->max_r2t - 1)) - session->max_r2t = roundup_pow_of_two(session->max_r2t); - if (iscsi_r2tpool_alloc(session)) - return -ENOMEM; - break; - case ISCSI_PARAM_IMM_DATA_EN: - session->imm_data_en = value; - break; - case ISCSI_PARAM_FIRST_BURST: - session->first_burst = value; - break; - case ISCSI_PARAM_MAX_BURST: - session->max_burst = value; - break; - case ISCSI_PARAM_PDU_INORDER_EN: - session->pdu_inorder_en = value; - break; - case ISCSI_PARAM_DATASEQ_INORDER_EN: - session->dataseq_inorder_en = value; - break; - case ISCSI_PARAM_ERL: - session->erl = value; - break; - case ISCSI_PARAM_IFMARKER_EN: - BUG_ON(value); - session->ifmarker_en = value; - break; - case ISCSI_PARAM_OFMARKER_EN: - BUG_ON(value); - session->ofmarker_en = value; - break; - default: - break; - } - - return 0; -} - -static int -iscsi_session_get_param(struct iscsi_cls_session *cls_session, - enum iscsi_param param, uint32_t *value) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - - switch(param) { - case ISCSI_PARAM_INITIAL_R2T_EN: - *value = session->initial_r2t_en; - break; - case ISCSI_PARAM_MAX_R2T: - *value = session->max_r2t; - break; - case ISCSI_PARAM_IMM_DATA_EN: - *value = session->imm_data_en; - break; - case ISCSI_PARAM_FIRST_BURST: - *value = session->first_burst; - break; - case ISCSI_PARAM_MAX_BURST: - *value = session->max_burst; - break; - case ISCSI_PARAM_PDU_INORDER_EN: - *value = session->pdu_inorder_en; - break; - case ISCSI_PARAM_DATASEQ_INORDER_EN: - *value = session->dataseq_inorder_en; - break; - case ISCSI_PARAM_ERL: - *value = session->erl; - break; - case ISCSI_PARAM_IFMARKER_EN: - *value = session->ifmarker_en; - break; - case ISCSI_PARAM_OFMARKER_EN: - *value = session->ofmarker_en; - break; - default: - return -EINVAL; - } - - return 0; -} - -static int -iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, - enum iscsi_param param, uint32_t *value) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct inet_sock *inet; - - switch(param) { - case ISCSI_PARAM_MAX_RECV_DLENGTH: - *value = conn->max_recv_dlength; - break; - case ISCSI_PARAM_MAX_XMIT_DLENGTH: - *value = conn->max_xmit_dlength; - break; - case ISCSI_PARAM_HDRDGST_EN: - *value = conn->hdrdgst_en; - break; - case ISCSI_PARAM_DATADGST_EN: - *value = conn->datadgst_en; - break; - case ISCSI_PARAM_CONN_PORT: - mutex_lock(&conn->xmitmutex); - if (!conn->sock) { - mutex_unlock(&conn->xmitmutex); - return -EINVAL; - } - - inet = inet_sk(conn->sock->sk); - *value = be16_to_cpu(inet->dport); - mutex_unlock(&conn->xmitmutex); - default: - return -EINVAL; - } - - return 0; -} - -static int -iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, - enum iscsi_param param, char *buf) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct sock *sk; - struct inet_sock *inet; - struct ipv6_pinfo *np; - int len = 0; - - switch (param) { - case ISCSI_PARAM_CONN_ADDRESS: - mutex_lock(&conn->xmitmutex); - if (!conn->sock) { - mutex_unlock(&conn->xmitmutex); - return -EINVAL; - } - - sk = conn->sock->sk; - if (sk->sk_family == PF_INET) { - inet = inet_sk(sk); - len = sprintf(buf, "%u.%u.%u.%u\n", - NIPQUAD(inet->daddr)); - } else { - np = inet6_sk(sk); - len = sprintf(buf, - "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", - NIP6(np->daddr)); - } - mutex_unlock(&conn->xmitmutex); - break; - default: - return -EINVAL; - } - - return len; -} - -static void -iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - - stats->txdata_octets = conn->txdata_octets; - stats->rxdata_octets = conn->rxdata_octets; - stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; - stats->dataout_pdus = conn->dataout_pdus_cnt; - stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; - stats->datain_pdus = conn->datain_pdus_cnt; - stats->r2t_pdus = conn->r2t_pdus_cnt; - stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; - stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; - stats->custom_length = 3; - strcpy(stats->custom[0].desc, "tx_sendpage_failures"); - stats->custom[0].value = conn->sendpage_failures_cnt; - strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); - stats->custom[1].value = conn->discontiguous_hdr_cnt; - strcpy(stats->custom[2].desc, "eh_abort_cnt"); - stats->custom[2].value = conn->eh_abort_cnt; -} - -static int -iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - int rc; - - mutex_lock(&conn->xmitmutex); - rc = iscsi_conn_send_generic(conn, hdr, data, data_size); - mutex_unlock(&conn->xmitmutex); - - return rc; -} - -static struct iscsi_transport iscsi_tcp_transport = { - .owner = THIS_MODULE, - .name = "tcp", - .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST - | CAP_DATADGST, - .param_mask = ISCSI_MAX_RECV_DLENGTH | - ISCSI_MAX_XMIT_DLENGTH | - ISCSI_HDRDGST_EN | - ISCSI_DATADGST_EN | - ISCSI_INITIAL_R2T_EN | - ISCSI_MAX_R2T | - ISCSI_IMM_DATA_EN | - ISCSI_FIRST_BURST | - ISCSI_MAX_BURST | - ISCSI_PDU_INORDER_EN | - ISCSI_DATASEQ_INORDER_EN | - ISCSI_ERL | - ISCSI_CONN_PORT | - ISCSI_CONN_ADDRESS, - .host_template = &iscsi_sht, - .hostdata_size = sizeof(struct iscsi_session), - .conndata_size = sizeof(struct iscsi_conn), - .max_conn = 1, - .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, - .create_session = iscsi_session_create, - .destroy_session = iscsi_session_destroy, - .create_conn = iscsi_conn_create, - .bind_conn = iscsi_conn_bind, - .destroy_conn = iscsi_conn_destroy, - .set_param = iscsi_conn_set_param, - .get_conn_param = iscsi_conn_get_param, - .get_conn_str_param = iscsi_conn_get_str_param, - .get_session_param = iscsi_session_get_param, - .start_conn = iscsi_conn_start, - .stop_conn = iscsi_conn_stop, - .send_pdu = iscsi_conn_send_pdu, - .get_stats = iscsi_conn_get_stats, - .session_recovery_timedout = iscsi_session_recovery_timedout, -}; - -static int __init -iscsi_tcp_init(void) -{ - if (iscsi_max_lun < 1) { - printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); - return -EINVAL; - } - iscsi_tcp_transport.max_lun = iscsi_max_lun; - - taskcache = kmem_cache_create("iscsi_taskcache", - sizeof(struct iscsi_data_task), 0, - SLAB_HWCACHE_ALIGN, NULL, NULL); - if (!taskcache) - return -ENOMEM; - - if (!iscsi_register_transport(&iscsi_tcp_transport)) - kmem_cache_destroy(taskcache); - - return 0; -} - -static void __exit -iscsi_tcp_exit(void) -{ - iscsi_unregister_transport(&iscsi_tcp_transport); - kmem_cache_destroy(taskcache); -} - -module_init(iscsi_tcp_init); -module_exit(iscsi_tcp_exit); +/* + * iSCSI Initiator over TCP/IP Data-Path + * + * Copyright (C) 2004 Dmitry Yusupov + * Copyright (C) 2004 Alex Aizman + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. + * maintained by open-iscsi@googlegroups.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * See the file COPYING included with this distribution for more details. + * + * Credits: + * Christoph Hellwig + * FUJITA Tomonori + * Arne Redlich + * Zhenyu Wang + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "iscsi_tcp.h" + +MODULE_AUTHOR("Dmitry Yusupov , " + "Alex Aizman "); +MODULE_DESCRIPTION("iSCSI/TCP data-path"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0:4.445"); +/* #define DEBUG_TCP */ +#define DEBUG_ASSERT + +#ifdef DEBUG_TCP +#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) +#else +#define debug_tcp(fmt...) +#endif + +#ifndef DEBUG_ASSERT +#ifdef BUG_ON +#undef BUG_ON +#endif +#define BUG_ON(expr) +#endif + +static unsigned int iscsi_max_lun = 512; +module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); + +/* global data */ +static kmem_cache_t *taskcache; + +static inline void +iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) +{ + sg_init_one(&ibuf->sg, (u8 *)vbuf, size); + ibuf->sent = 0; + ibuf->use_sendmsg = 0; +} + +static inline void +iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size) +{ + ibuf->sg.page = virt_to_page(vbuf); + ibuf->sg.offset = offset_in_page(vbuf); + ibuf->sg.length = size; + ibuf->sent = 0; + ibuf->use_sendmsg = 1; +} + +static inline void +iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg) +{ + ibuf->sg.page = sg->page; + ibuf->sg.offset = sg->offset; + ibuf->sg.length = sg->length; + /* + * Fastpath: sg element fits into single page + */ + if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page)) + ibuf->use_sendmsg = 0; + else + ibuf->use_sendmsg = 1; + ibuf->sent = 0; +} + +static inline int +iscsi_buf_left(struct iscsi_buf *ibuf) +{ + int rc; + + rc = ibuf->sg.length - ibuf->sent; + BUG_ON(rc < 0); + return rc; +} + +static inline void +iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, + u8* crc) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); + buf->sg.length += sizeof(uint32_t); +} + +static inline int +iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) +{ + struct sk_buff *skb = tcp_conn->in.skb; + + tcp_conn->in.zero_copy_hdr = 0; + + if (tcp_conn->in.copy >= tcp_conn->hdr_size && + tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { + /* + * Zero-copy PDU Header: using connection context + * to store header pointer. + */ + if (skb_shinfo(skb)->frag_list == NULL && + !skb_shinfo(skb)->nr_frags) { + tcp_conn->in.hdr = (struct iscsi_hdr *) + ((char*)skb->data + tcp_conn->in.offset); + tcp_conn->in.zero_copy_hdr = 1; + } else { + /* ignoring return code since we checked + * in.copy before */ + skb_copy_bits(skb, tcp_conn->in.offset, + &tcp_conn->hdr, tcp_conn->hdr_size); + tcp_conn->in.hdr = &tcp_conn->hdr; + } + tcp_conn->in.offset += tcp_conn->hdr_size; + tcp_conn->in.copy -= tcp_conn->hdr_size; + } else { + int hdr_remains; + int copylen; + + /* + * PDU header scattered across SKB's, + * copying it... This'll happen quite rarely. + */ + + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) + tcp_conn->in.hdr_offset = 0; + + hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; + BUG_ON(hdr_remains <= 0); + + copylen = min(tcp_conn->in.copy, hdr_remains); + skb_copy_bits(skb, tcp_conn->in.offset, + (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, + copylen); + + debug_tcp("PDU gather offset %d bytes %d in.offset %d " + "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, + tcp_conn->in.offset, tcp_conn->in.copy); + + tcp_conn->in.offset += copylen; + tcp_conn->in.copy -= copylen; + if (copylen < hdr_remains) { + tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; + tcp_conn->in.hdr_offset += copylen; + return -EAGAIN; + } + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->discontiguous_hdr_cnt++; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + } + + return 0; +} + +/* + * must be called with session lock + */ +static void +__iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct scsi_cmnd *sc; + + sc = ctask->sc; + if (unlikely(!sc)) + return; + + if (sc->sc_data_direction == DMA_TO_DEVICE) { + struct iscsi_data_task *dtask, *n; + + /* WRITE: cleanup Data-Out's if any */ + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { + list_del(&dtask->item); + mempool_free(dtask, tcp_ctask->datapool); + } + } + tcp_ctask->xmstate = XMSTATE_IDLE; + tcp_ctask->r2t = NULL; +} + +/** + * iscsi_data_rsp - SCSI Data-In Response processing + * @conn: iscsi connection + * @ctask: scsi command task + **/ +static int +iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + int rc; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; + struct iscsi_session *session = conn->session; + int datasn = be32_to_cpu(rhdr->datasn); + + rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); + if (rc) + return rc; + /* + * setup Data-In byte counter (gets decremented..) + */ + ctask->data_count = tcp_conn->in.datalen; + + if (tcp_conn->in.datalen == 0) + return 0; + + if (ctask->datasn != datasn) + return ISCSI_ERR_DATASN; + + ctask->datasn++; + + tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); + if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) + return ISCSI_ERR_DATA_OFFSET; + + if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { + struct scsi_cmnd *sc = ctask->sc; + + conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; + if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) { + int res_count = be32_to_cpu(rhdr->residual_count); + + if (res_count > 0 && + res_count <= sc->request_bufflen) { + sc->resid = res_count; + sc->result = (DID_OK << 16) | rhdr->cmd_status; + } else + sc->result = (DID_BAD_TARGET << 16) | + rhdr->cmd_status; + } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) { + sc->resid = be32_to_cpu(rhdr->residual_count); + sc->result = (DID_OK << 16) | rhdr->cmd_status; + } else + sc->result = (DID_OK << 16) | rhdr->cmd_status; + } + + conn->datain_pdus_cnt++; + return 0; +} + +/** + * iscsi_solicit_data_init - initialize first Data-Out + * @conn: iscsi connection + * @ctask: scsi command task + * @r2t: R2T info + * + * Notes: + * Initialize first Data-Out within this R2T sequence and finds + * proper data_offset within this SCSI command. + * + * This function is called with connection lock taken. + **/ +static void +iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, + struct iscsi_r2t_info *r2t) +{ + struct iscsi_data *hdr; + struct iscsi_data_task *dtask; + struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); + BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); + hdr = &dtask->hdr; + memset(hdr, 0, sizeof(struct iscsi_data)); + hdr->ttt = r2t->ttt; + hdr->datasn = cpu_to_be32(r2t->solicit_datasn); + r2t->solicit_datasn++; + hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; + hdr->exp_statsn = r2t->exp_statsn; + hdr->offset = cpu_to_be32(r2t->data_offset); + if (r2t->data_length > conn->max_xmit_dlength) { + hton24(hdr->dlength, conn->max_xmit_dlength); + r2t->data_count = conn->max_xmit_dlength; + hdr->flags = 0; + } else { + hton24(hdr->dlength, r2t->data_length); + r2t->data_count = r2t->data_length; + hdr->flags = ISCSI_FLAG_CMD_FINAL; + } + conn->dataout_pdus_cnt++; + + r2t->sent = 0; + + iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, + sizeof(struct iscsi_hdr)); + + r2t->dtask = dtask; + + if (sc->use_sg) { + int i, sg_count = 0; + struct scatterlist *sg = sc->request_buffer; + + r2t->sg = NULL; + for (i = 0; i < sc->use_sg; i++, sg += 1) { + /* FIXME: prefetch ? */ + if (sg_count + sg->length > r2t->data_offset) { + int page_offset; + + /* sg page found! */ + + /* offset within this page */ + page_offset = r2t->data_offset - sg_count; + + /* fill in this buffer */ + iscsi_buf_init_sg(&r2t->sendbuf, sg); + r2t->sendbuf.sg.offset += page_offset; + r2t->sendbuf.sg.length -= page_offset; + + /* xmit logic will continue with next one */ + r2t->sg = sg + 1; + break; + } + sg_count += sg->length; + } + BUG_ON(r2t->sg == NULL); + } else + iscsi_buf_init_iov(&tcp_ctask->sendbuf, + (char*)sc->request_buffer + r2t->data_offset, + r2t->data_count); + + list_add(&dtask->item, &tcp_ctask->dataqueue); +} + +/** + * iscsi_r2t_rsp - iSCSI R2T Response processing + * @conn: iscsi connection + * @ctask: scsi command task + **/ +static int +iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_r2t_info *r2t; + struct iscsi_session *session = conn->session; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; + int r2tsn = be32_to_cpu(rhdr->r2tsn); + int rc; + + if (tcp_conn->in.datalen) + return ISCSI_ERR_DATALEN; + + if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) + return ISCSI_ERR_R2TSN; + + rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); + if (rc) + return rc; + + /* FIXME: use R2TSN to detect missing R2T */ + + /* fill-in new R2T associated with the task */ + spin_lock(&session->lock); + if (!ctask->sc || ctask->mtask || + session->state != ISCSI_STATE_LOGGED_IN) { + printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in " + "recovery...\n", ctask->itt); + spin_unlock(&session->lock); + return 0; + } + rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + BUG_ON(!rc); + + r2t->exp_statsn = rhdr->statsn; + r2t->data_length = be32_to_cpu(rhdr->data_length); + if (r2t->data_length == 0 || + r2t->data_length > session->max_burst) { + spin_unlock(&session->lock); + return ISCSI_ERR_DATALEN; + } + + r2t->data_offset = be32_to_cpu(rhdr->data_offset); + if (r2t->data_offset + r2t->data_length > ctask->total_length) { + spin_unlock(&session->lock); + return ISCSI_ERR_DATALEN; + } + + r2t->ttt = rhdr->ttt; /* no flip */ + r2t->solicit_datasn = 0; + + iscsi_solicit_data_init(conn, ctask, r2t); + + tcp_ctask->exp_r2tsn = r2tsn + 1; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; + __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); + __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); + + scsi_queue_work(session->host, &conn->xmitwork); + conn->r2t_pdus_cnt++; + spin_unlock(&session->lock); + + return 0; +} + +static int +iscsi_tcp_hdr_recv(struct iscsi_conn *conn) +{ + int rc = 0, opcode, ahslen; + struct iscsi_hdr *hdr; + struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + uint32_t cdgst, rdgst = 0, itt; + + hdr = tcp_conn->in.hdr; + + /* verify PDU length */ + tcp_conn->in.datalen = ntoh24(hdr->dlength); + if (tcp_conn->in.datalen > conn->max_recv_dlength) { + printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", + tcp_conn->in.datalen, conn->max_recv_dlength); + return ISCSI_ERR_DATALEN; + } + tcp_conn->data_copied = 0; + + /* read AHS */ + ahslen = hdr->hlength << 2; + tcp_conn->in.offset += ahslen; + tcp_conn->in.copy -= ahslen; + if (tcp_conn->in.copy < 0) { + printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " + "%d bytes\n", ahslen); + return ISCSI_ERR_AHSLEN; + } + + /* calculate read padding */ + tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); + if (tcp_conn->in.padding) { + tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; + debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); + } + + if (conn->hdrdgst_en) { + struct scatterlist sg; + + sg_init_one(&sg, (u8 *)hdr, + sizeof(struct iscsi_hdr) + ahslen); + crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); + rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + + ahslen); + if (cdgst != rdgst) { + printk(KERN_ERR "iscsi_tcp: hdrdgst error " + "recv 0x%x calc 0x%x\n", rdgst, cdgst); + return ISCSI_ERR_HDR_DGST; + } + } + + opcode = hdr->opcode & ISCSI_OPCODE_MASK; + /* verify itt (itt encoding: age+cid+itt) */ + rc = iscsi_verify_itt(conn, hdr, &itt); + if (rc == ISCSI_ERR_NO_SCSI_CMD) { + tcp_conn->in.datalen = 0; /* force drop */ + return 0; + } else if (rc) + return rc; + + debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", + opcode, tcp_conn->in.offset, tcp_conn->in.copy, + ahslen, tcp_conn->in.datalen); + + switch(opcode) { + case ISCSI_OP_SCSI_DATA_IN: + tcp_conn->in.ctask = session->cmds[itt]; + rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); + /* fall through */ + case ISCSI_OP_SCSI_CMD_RSP: + tcp_conn->in.ctask = session->cmds[itt]; + if (tcp_conn->in.datalen) + goto copy_hdr; + + spin_lock(&session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); + spin_unlock(&session->lock); + break; + case ISCSI_OP_R2T: + tcp_conn->in.ctask = session->cmds[itt]; + if (ahslen) + rc = ISCSI_ERR_AHSLEN; + else if (tcp_conn->in.ctask->sc->sc_data_direction == + DMA_TO_DEVICE) + rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); + else + rc = ISCSI_ERR_PROTO; + break; + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_LOGOUT_RSP: + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_REJECT: + case ISCSI_OP_ASYNC_EVENT: + if (tcp_conn->in.datalen) + goto copy_hdr; + /* fall through */ + case ISCSI_OP_SCSI_TMFUNC_RSP: + rc = iscsi_complete_pdu(conn, hdr, NULL, 0); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + + return rc; + +copy_hdr: + /* + * if we did zero copy for the header but we will need multiple + * skbs to complete the command then we have to copy the header + * for later use + */ + if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < + (tcp_conn->in.datalen + tcp_conn->in.padding + + (conn->datadgst_en ? 4 : 0))) { + debug_tcp("Copying header for later use. in.copy %d in.datalen" + " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); + memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, + sizeof(struct iscsi_hdr)); + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->in.zero_copy_hdr = 0; + } + return 0; +} + +/** + * iscsi_ctask_copy - copy skb bits to the destanation cmd task + * @conn: iscsi tcp connection + * @ctask: scsi command task + * @buf: buffer to copy to + * @buf_size: size of buffer + * @offset: offset within the buffer + * + * Notes: + * The function calls skb_copy_bits() and updates per-connection and + * per-cmd byte counters. + * + * Read counters (in bytes): + * + * conn->in.offset offset within in progress SKB + * conn->in.copy left to copy from in progress SKB + * including padding + * conn->in.copied copied already from in progress SKB + * conn->data_copied copied already from in progress buffer + * ctask->sent total bytes sent up to the MidLayer + * ctask->data_count left to copy from in progress Data-In + * buf_left left to copy from in progress buffer + **/ +static inline int +iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, + void *buf, int buf_size, int offset) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + int buf_left = buf_size - (tcp_conn->data_copied + offset); + int size = min(tcp_conn->in.copy, buf_left); + int rc; + + size = min(size, ctask->data_count); + + debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", + size, tcp_conn->in.offset, tcp_conn->in.copied); + + BUG_ON(size <= 0); + BUG_ON(tcp_ctask->sent + size > ctask->total_length); + + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + (offset + tcp_conn->data_copied), size); + /* must fit into skb->len */ + BUG_ON(rc); + + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; + tcp_ctask->sent += size; + ctask->data_count -= size; + + BUG_ON(tcp_conn->in.copy < 0); + BUG_ON(ctask->data_count < 0); + + if (buf_size != (tcp_conn->data_copied + offset)) { + if (!ctask->data_count) { + BUG_ON(buf_size - tcp_conn->data_copied < 0); + /* done with this PDU */ + return buf_size - tcp_conn->data_copied; + } + return -EAGAIN; + } + + /* done with this buffer or with both - PDU and buffer */ + tcp_conn->data_copied = 0; + return 0; +} + +/** + * iscsi_tcp_copy - copy skb bits to the destanation buffer + * @conn: iscsi tcp connection + * + * Notes: + * The function calls skb_copy_bits() and updates per-connection + * byte counters. + **/ +static inline int +iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) +{ + void *buf = tcp_conn->data; + int buf_size = tcp_conn->in.datalen; + int buf_left = buf_size - tcp_conn->data_copied; + int size = min(tcp_conn->in.copy, buf_left); + int rc; + + debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", + size, tcp_conn->in.offset, tcp_conn->data_copied); + BUG_ON(size <= 0); + + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + tcp_conn->data_copied, size); + BUG_ON(rc); + + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; + + if (buf_size != tcp_conn->data_copied) + return -EAGAIN; + + return 0; +} + +static inline void +partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, + struct scatterlist *sg, int offset, int length) +{ + struct scatterlist temp; + + memcpy(&temp, sg, sizeof(struct scatterlist)); + temp.offset = offset; + temp.length = length; + crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); +} + +static void +iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) +{ + struct scatterlist tmp; + + sg_init_one(&tmp, buf, len); + crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); +} + +static int iscsi_scsi_data_in(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct scsi_cmnd *sc = ctask->sc; + struct scatterlist *sg; + int i, offset, rc = 0; + + BUG_ON((void*)ctask != sc->SCp.ptr); + + /* + * copying Data-In into the Scsi_Cmnd + */ + if (!sc->use_sg) { + i = ctask->data_count; + rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, + sc->request_bufflen, + tcp_ctask->data_offset); + if (rc == -EAGAIN) + return rc; + if (conn->datadgst_en) + iscsi_recv_digest_update(tcp_conn, sc->request_buffer, + i); + rc = 0; + goto done; + } + + offset = tcp_ctask->data_offset; + sg = sc->request_buffer; + + if (tcp_ctask->data_offset) + for (i = 0; i < tcp_ctask->sg_count; i++) + offset -= sg[i].length; + /* we've passed through partial sg*/ + if (offset < 0) + offset = 0; + + for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { + char *dest; + + dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); + rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, + sg[i].length, offset); + kunmap_atomic(dest, KM_SOFTIRQ0); + if (rc == -EAGAIN) + /* continue with the next SKB/PDU */ + return rc; + if (!rc) { + if (conn->datadgst_en) { + if (!offset) + crypto_digest_update( + tcp_conn->data_rx_tfm, + &sg[i], 1); + else + partial_sg_digest_update(tcp_conn, + &sg[i], + sg[i].offset + offset, + sg[i].length - offset); + } + offset = 0; + tcp_ctask->sg_count++; + } + + if (!ctask->data_count) { + if (rc && conn->datadgst_en) + /* + * data-in is complete, but buffer not... + */ + partial_sg_digest_update(tcp_conn, &sg[i], + sg[i].offset, sg[i].length-rc); + rc = 0; + break; + } + + if (!tcp_conn->in.copy) + return -EAGAIN; + } + BUG_ON(ctask->data_count); + +done: + /* check for non-exceptional status */ + if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { + debug_scsi("done [sc %lx res %d itt 0x%x]\n", + (long)sc, sc->result, ctask->itt); + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, ctask); + __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); + spin_unlock(&conn->session->lock); + } + + return rc; +} + +static int +iscsi_data_recv(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int rc = 0, opcode; + + opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; + switch (opcode) { + case ISCSI_OP_SCSI_DATA_IN: + rc = iscsi_scsi_data_in(conn); + break; + case ISCSI_OP_SCSI_CMD_RSP: + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + spin_unlock(&conn->session->lock); + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_ASYNC_EVENT: + case ISCSI_OP_REJECT: + /* + * Collect data segment to the connection's data + * placeholder + */ + if (iscsi_tcp_copy(tcp_conn)) { + rc = -EAGAIN; + goto exit; + } + + rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, + tcp_conn->in.datalen); + if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) + iscsi_recv_digest_update(tcp_conn, tcp_conn->data, + tcp_conn->in.datalen); + break; + default: + BUG_ON(1); + } +exit: + return rc; +} + +/** + * iscsi_tcp_data_recv - TCP receive in sendfile fashion + * @rd_desc: read descriptor + * @skb: socket buffer + * @offset: offset in skb + * @len: skb->len - offset + **/ +static int +iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, + unsigned int offset, size_t len) +{ + int rc; + struct iscsi_conn *conn = rd_desc->arg.data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int processed; + char pad[ISCSI_PAD_LEN]; + struct scatterlist sg; + + /* + * Save current SKB and its offset in the corresponding + * connection context. + */ + tcp_conn->in.copy = skb->len - offset; + tcp_conn->in.offset = offset; + tcp_conn->in.skb = skb; + tcp_conn->in.len = tcp_conn->in.copy; + BUG_ON(tcp_conn->in.copy <= 0); + debug_tcp("in %d bytes\n", tcp_conn->in.copy); + +more: + tcp_conn->in.copied = 0; + rc = 0; + + if (unlikely(conn->suspend_rx)) { + debug_tcp("conn %d Rx suspended!\n", conn->id); + return 0; + } + + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || + tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { + rc = iscsi_hdr_extract(tcp_conn); + if (rc) { + if (rc == -EAGAIN) + goto nomore; + else { + iscsi_conn_failure(conn, rc); + return 0; + } + } + + /* + * Verify and process incoming PDU header. + */ + rc = iscsi_tcp_hdr_recv(conn); + if (!rc && tcp_conn->in.datalen) { + if (conn->datadgst_en) { + BUG_ON(!tcp_conn->data_rx_tfm); + crypto_digest_init(tcp_conn->data_rx_tfm); + } + tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; + } else if (rc) { + iscsi_conn_failure(conn, rc); + return 0; + } + } + + if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { + uint32_t recv_digest; + + debug_tcp("extra data_recv offset %d copy %d\n", + tcp_conn->in.offset, tcp_conn->in.copy); + skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + &recv_digest, 4); + tcp_conn->in.offset += 4; + tcp_conn->in.copy -= 4; + if (recv_digest != tcp_conn->in.datadgst) { + debug_tcp("iscsi_tcp: data digest error!" + "0x%x != 0x%x\n", recv_digest, + tcp_conn->in.datadgst); + iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); + return 0; + } else { + debug_tcp("iscsi_tcp: data digest match!" + "0x%x == 0x%x\n", recv_digest, + tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + } + } + + if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && + tcp_conn->in.copy) { + + debug_tcp("data_recv offset %d copy %d\n", + tcp_conn->in.offset, tcp_conn->in.copy); + + rc = iscsi_data_recv(conn); + if (rc) { + if (rc == -EAGAIN) { + rd_desc->count = tcp_conn->in.datalen - + tcp_conn->in.ctask->data_count; + goto again; + } + iscsi_conn_failure(conn, rc); + return 0; + } + tcp_conn->in.copy -= tcp_conn->in.padding; + tcp_conn->in.offset += tcp_conn->in.padding; + if (conn->datadgst_en) { + if (tcp_conn->in.padding) { + debug_tcp("padding -> %d\n", + tcp_conn->in.padding); + memset(pad, 0, tcp_conn->in.padding); + sg_init_one(&sg, pad, tcp_conn->in.padding); + crypto_digest_update(tcp_conn->data_rx_tfm, + &sg, 1); + } + crypto_digest_final(tcp_conn->data_rx_tfm, + (u8 *) & tcp_conn->in.datadgst); + debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; + } else + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + } + + debug_tcp("f, processed %d from out of %d padding %d\n", + tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); + BUG_ON(tcp_conn->in.offset - offset > len); + + if (tcp_conn->in.offset - offset != len) { + debug_tcp("continue to process %d bytes\n", + (int)len - (tcp_conn->in.offset - offset)); + goto more; + } + +nomore: + processed = tcp_conn->in.offset - offset; + BUG_ON(processed == 0); + return processed; + +again: + processed = tcp_conn->in.offset - offset; + debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", + processed, (int)len, (int)rd_desc->count); + BUG_ON(processed == 0); + BUG_ON(processed > len); + + conn->rxdata_octets += processed; + return processed; +} + +static void +iscsi_tcp_data_ready(struct sock *sk, int flag) +{ + struct iscsi_conn *conn = sk->sk_user_data; + read_descriptor_t rd_desc; + + read_lock(&sk->sk_callback_lock); + + /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */ + rd_desc.arg.data = conn; + rd_desc.count = 0; + tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv); + + read_unlock(&sk->sk_callback_lock); +} + +static void +iscsi_tcp_state_change(struct sock *sk) +{ + struct iscsi_tcp_conn *tcp_conn; + struct iscsi_conn *conn; + struct iscsi_session *session; + void (*old_state_change)(struct sock *); + + read_lock(&sk->sk_callback_lock); + + conn = (struct iscsi_conn*)sk->sk_user_data; + session = conn->session; + + if ((sk->sk_state == TCP_CLOSE_WAIT || + sk->sk_state == TCP_CLOSE) && + !atomic_read(&sk->sk_rmem_alloc)) { + debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + } + + tcp_conn = conn->dd_data; + old_state_change = tcp_conn->old_state_change; + + read_unlock(&sk->sk_callback_lock); + + old_state_change(sk); +} + +/** + * iscsi_write_space - Called when more output buffer space is available + * @sk: socket space is available for + **/ +static void +iscsi_write_space(struct sock *sk) +{ + struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + tcp_conn->old_write_space(sk); + debug_tcp("iscsi_write_space: cid %d\n", conn->id); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + scsi_queue_work(conn->session->host, &conn->xmitwork); +} + +static void +iscsi_conn_set_callbacks(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; + + /* assign new callbacks */ + write_lock_bh(&sk->sk_callback_lock); + sk->sk_user_data = conn; + tcp_conn->old_data_ready = sk->sk_data_ready; + tcp_conn->old_state_change = sk->sk_state_change; + tcp_conn->old_write_space = sk->sk_write_space; + sk->sk_data_ready = iscsi_tcp_data_ready; + sk->sk_state_change = iscsi_tcp_state_change; + sk->sk_write_space = iscsi_write_space; + write_unlock_bh(&sk->sk_callback_lock); +} + +static void +iscsi_conn_restore_callbacks(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; + + /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ + write_lock_bh(&sk->sk_callback_lock); + sk->sk_user_data = NULL; + sk->sk_data_ready = tcp_conn->old_data_ready; + sk->sk_state_change = tcp_conn->old_state_change; + sk->sk_write_space = tcp_conn->old_write_space; + sk->sk_no_check = 0; + write_unlock_bh(&sk->sk_callback_lock); +} + +/** + * iscsi_send - generic send routine + * @sk: kernel's socket + * @buf: buffer to write from + * @size: actual size to write + * @flags: socket's flags + */ +static inline int +iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct socket *sk = tcp_conn->sock; + int offset = buf->sg.offset + buf->sent; + + /* + * if we got use_sg=0 or are sending something we kmallocd + * then we did not have to do kmap (kmap returns page_address) + * + * if we got use_sg > 0, but had to drop down, we do not + * set clustering so this should only happen for that + * slab case. + */ + if (buf->use_sendmsg) + return sock_no_sendpage(sk, buf->sg.page, offset, size, flags); + else + return tcp_conn->sendpage(sk, buf->sg.page, offset, size, + flags); +} + +/** + * iscsi_sendhdr - send PDU Header via tcp_sendpage() + * @conn: iscsi connection + * @buf: buffer to write from + * @datalen: lenght of data to be sent after the header + * + * Notes: + * (Tx, Fast Path) + **/ +static inline int +iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) +{ + struct iscsi_tcp_conn *tcp_conn; + int flags = 0; /* MSG_DONTWAIT; */ + int res, size; + + size = buf->sg.length - buf->sent; + BUG_ON(buf->sent + size > buf->sg.length); + if (buf->sent + size != buf->sg.length || datalen) + flags |= MSG_MORE; + + res = iscsi_send(conn, buf, size, flags); + debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); + if (res >= 0) { + conn->txdata_octets += res; + buf->sent += res; + if (size != res) + return -EAGAIN; + return 0; + } else if (res == -EAGAIN) { + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + } else if (res == -EPIPE) + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + + return res; +} + +/** + * iscsi_sendpage - send one page of iSCSI Data-Out. + * @conn: iscsi connection + * @buf: buffer to write from + * @count: remaining data + * @sent: number of bytes sent + * + * Notes: + * (Tx, Fast Path) + **/ +static inline int +iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, + int *count, int *sent) +{ + struct iscsi_tcp_conn *tcp_conn; + int flags = 0; /* MSG_DONTWAIT; */ + int res, size; + + size = buf->sg.length - buf->sent; + BUG_ON(buf->sent + size > buf->sg.length); + if (size > *count) + size = *count; + if (buf->sent + size != buf->sg.length || *count != size) + flags |= MSG_MORE; + + res = iscsi_send(conn, buf, size, flags); + debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", + size, buf->sent, *count, *sent, res); + if (res >= 0) { + conn->txdata_octets += res; + buf->sent += res; + *count -= res; + *sent += res; + if (size != res) + return -EAGAIN; + return 0; + } else if (res == -EAGAIN) { + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + } else if (res == -EPIPE) + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + + return res; +} + +static inline void +iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, + struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + BUG_ON(!tcp_conn->data_tx_tfm); + crypto_digest_init(tcp_conn->data_tx_tfm); + tcp_ctask->digest_count = 4; +} + +static int +iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, + struct iscsi_buf *buf, uint32_t *digest, int final) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int rc = 0; + int sent = 0; + + if (final) + crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); + + iscsi_buf_init_virt(buf, (char*)digest, 4); + rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); + if (rc) { + tcp_ctask->datadigest = *digest; + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; + } else + tcp_ctask->digest_count = 4; + return rc; +} + +/** + * iscsi_solicit_data_cont - initialize next Data-Out + * @conn: iscsi connection + * @ctask: scsi command task + * @r2t: R2T info + * @left: bytes left to transfer + * + * Notes: + * Initialize next Data-Out within this R2T sequence and continue + * to process next Scatter-Gather element(if any) of this SCSI command. + * + * Called under connection lock. + **/ +static void +iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, + struct iscsi_r2t_info *r2t, int left) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data *hdr; + struct iscsi_data_task *dtask; + struct scsi_cmnd *sc = ctask->sc; + int new_offset; + + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); + BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); + hdr = &dtask->hdr; + memset(hdr, 0, sizeof(struct iscsi_data)); + hdr->ttt = r2t->ttt; + hdr->datasn = cpu_to_be32(r2t->solicit_datasn); + r2t->solicit_datasn++; + hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; + hdr->exp_statsn = r2t->exp_statsn; + new_offset = r2t->data_offset + r2t->sent; + hdr->offset = cpu_to_be32(new_offset); + if (left > conn->max_xmit_dlength) { + hton24(hdr->dlength, conn->max_xmit_dlength); + r2t->data_count = conn->max_xmit_dlength; + } else { + hton24(hdr->dlength, left); + r2t->data_count = left; + hdr->flags = ISCSI_FLAG_CMD_FINAL; + } + conn->dataout_pdus_cnt++; + + iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr, + sizeof(struct iscsi_hdr)); + + r2t->dtask = dtask; + + if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { + BUG_ON(tcp_ctask->bad_sg == r2t->sg); + iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); + r2t->sg += 1; + } else + iscsi_buf_init_iov(&tcp_ctask->sendbuf, + (char*)sc->request_buffer + new_offset, + r2t->data_count); + + list_add(&dtask->item, &tcp_ctask->dataqueue); +} + +static void +iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_task *dtask; + + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); + BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); + + iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, + tcp_ctask->r2t_data_count); + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)&dtask->hdr, + sizeof(struct iscsi_hdr)); + + list_add(&dtask->item, &tcp_ctask->dataqueue); + tcp_ctask->dtask = dtask; +} + +/** + * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands + * @conn: iscsi connection + * @ctask: scsi command task + * @sc: scsi command + **/ +static void +iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) +{ + struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); + + tcp_ctask->sent = 0; + tcp_ctask->sg_count = 0; + + if (sc->sc_data_direction == DMA_TO_DEVICE) { + tcp_ctask->xmstate = XMSTATE_W_HDR; + tcp_ctask->exp_r2tsn = 0; + BUG_ON(ctask->total_length == 0); + + if (sc->use_sg) { + struct scatterlist *sg = sc->request_buffer; + + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &sg[tcp_ctask->sg_count++]); + tcp_ctask->sg = sg; + tcp_ctask->bad_sg = sg + sc->use_sg; + } else + iscsi_buf_init_iov(&tcp_ctask->sendbuf, + sc->request_buffer, + sc->request_bufflen); + + if (ctask->imm_count) + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; + + tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); + if (tcp_ctask->pad_count) { + tcp_ctask->pad_count = ISCSI_PAD_LEN - + tcp_ctask->pad_count; + debug_scsi("write padding %d bytes\n", + tcp_ctask->pad_count); + tcp_ctask->xmstate |= XMSTATE_W_PAD; + } + + if (ctask->unsol_count) + tcp_ctask->xmstate |= XMSTATE_UNS_HDR | + XMSTATE_UNS_INIT; + tcp_ctask->r2t_data_count = ctask->total_length - + ctask->imm_count - + ctask->unsol_count; + + debug_scsi("cmd [itt %x total %d imm %d imm_data %d " + "r2t_data %d]\n", + ctask->itt, ctask->total_length, ctask->imm_count, + ctask->unsol_count, tcp_ctask->r2t_data_count); + } else + tcp_ctask->xmstate = XMSTATE_R_HDR; + + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)ctask->hdr, + sizeof(struct iscsi_hdr)); +} + +/** + * iscsi_tcp_mtask_xmit - xmit management(immediate) task + * @conn: iscsi connection + * @mtask: task management task + * + * Notes: + * The function can return -EAGAIN in which case caller must + * call it again later, or recover. '0' return code means successful + * xmit. + * + * Management xmit state machine consists of two states: + * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress + * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress + **/ +static int +iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) +{ + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; + + debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", + conn->id, tcp_mtask->xmstate, mtask->itt); + + if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { + tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; + if (mtask->data_count) + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; + if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && + conn->stop_stage != STOP_CONN_RECOVER && + conn->hdrdgst_en) + iscsi_hdr_digest(conn, &tcp_mtask->headbuf, + (u8*)tcp_mtask->hdrext); + if (iscsi_sendhdr(conn, &tcp_mtask->headbuf, + mtask->data_count)) { + tcp_mtask->xmstate |= XMSTATE_IMM_HDR; + if (mtask->data_count) + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; + return -EAGAIN; + } + } + + if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { + BUG_ON(!mtask->data_count); + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; + /* FIXME: implement. + * Virtual buffer could be spreaded across multiple pages... + */ + do { + if (iscsi_sendpage(conn, &tcp_mtask->sendbuf, + &mtask->data_count, &tcp_mtask->sent)) { + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; + return -EAGAIN; + } + } while (mtask->data_count); + } + + BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); + if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { + struct iscsi_session *session = conn->session; + + spin_lock_bh(&session->lock); + list_del(&conn->mtask->running); + __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, + sizeof(void*)); + spin_unlock_bh(&session->lock); + } + return 0; +} + +static inline int +handle_xmstate_r_hdr(struct iscsi_conn *conn, + struct iscsi_tcp_cmd_task *tcp_ctask) +{ + tcp_ctask->xmstate &= ~XMSTATE_R_HDR; + if (conn->hdrdgst_en) + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (!iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0)) { + BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); + return 0; /* wait for Data-In */ + } + tcp_ctask->xmstate |= XMSTATE_R_HDR; + return -EAGAIN; +} + +static inline int +handle_xmstate_w_hdr(struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_W_HDR; + if (conn->hdrdgst_en) + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count)) { + tcp_ctask->xmstate |= XMSTATE_W_HDR; + return -EAGAIN; + } + return 0; +} + +static inline int +handle_xmstate_data_digest(struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; + debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->datadigest, 0)) { + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; + debug_tcp("resent data digest 0x%x fail!\n", + tcp_ctask->datadigest); + return -EAGAIN; + } + return 0; +} + +static inline int +handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + BUG_ON(!ctask->imm_count); + tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; + + if (conn->datadgst_en) { + iscsi_data_digest_init(tcp_conn, ctask); + tcp_ctask->immdigest = 0; + } + + for (;;) { + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->imm_count, + &tcp_ctask->sent)) { + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; + if (conn->datadgst_en) { + crypto_digest_final(tcp_conn->data_tx_tfm, + (u8*)&tcp_ctask->immdigest); + debug_tcp("tx imm sendpage fail 0x%x\n", + tcp_ctask->datadigest); + } + return -EAGAIN; + } + if (conn->datadgst_en) + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); + + if (!ctask->imm_count) + break; + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); + } + + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { + debug_tcp("sending imm digest 0x%x fail!\n", + tcp_ctask->immdigest); + return -EAGAIN; + } + debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); + } + + return 0; +} + +static inline int +handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_task *dtask; + + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; + if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { + iscsi_unsolicit_data_init(conn, ctask); + BUG_ON(!tcp_ctask->dtask); + dtask = tcp_ctask->dtask; + if (conn->hdrdgst_en) + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)dtask->hdrext); + tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; + } + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count)) { + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; + tcp_ctask->xmstate |= XMSTATE_UNS_HDR; + return -EAGAIN; + } + + debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", + ctask->itt, ctask->unsol_count, tcp_ctask->sent); + return 0; +} + +static inline int +handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + BUG_ON(!ctask->data_count); + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; + + if (conn->datadgst_en) { + iscsi_data_digest_init(tcp_conn, ctask); + dtask->digest = 0; + } + + for (;;) { + int start = tcp_ctask->sent; + + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, + &ctask->data_count, &tcp_ctask->sent)) { + ctask->unsol_count -= tcp_ctask->sent - start; + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; + /* will continue with this ctask later.. */ + if (conn->datadgst_en) { + crypto_digest_final(tcp_conn->data_tx_tfm, + (u8 *)&dtask->digest); + debug_tcp("tx uns data fail 0x%x\n", + dtask->digest); + } + return -EAGAIN; + } + + BUG_ON(tcp_ctask->sent > ctask->total_length); + ctask->unsol_count -= tcp_ctask->sent - start; + + /* + * XXX:we may run here with un-initial sendbuf. + * so pass it + */ + if (conn->datadgst_en && tcp_ctask->sent - start > 0) + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); + + if (!ctask->data_count) + break; + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); + } + BUG_ON(ctask->unsol_count < 0); + + /* + * Done with the Data-Out. Next, check if we need + * to send another unsolicited Data-Out. + */ + if (ctask->unsol_count) { + if (conn->datadgst_en) { + if (iscsi_digest_final_send(conn, ctask, + &dtask->digestbuf, + &dtask->digest, 1)) { + debug_tcp("send uns digest 0x%x fail\n", + dtask->digest); + return -EAGAIN; + } + debug_tcp("sending uns digest 0x%x, more uns\n", + dtask->digest); + } + tcp_ctask->xmstate |= XMSTATE_UNS_INIT; + return 1; + } + + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { + if (iscsi_digest_final_send(conn, ctask, + &dtask->digestbuf, + &dtask->digest, 1)) { + debug_tcp("send last uns digest 0x%x fail\n", + dtask->digest); + return -EAGAIN; + } + debug_tcp("sending uns digest 0x%x\n",dtask->digest); + } + + return 0; +} + +static inline int +handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_r2t_info *r2t = tcp_ctask->r2t; + struct iscsi_data_task *dtask = r2t->dtask; + int left; + + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->dtask = dtask; + + if (conn->datadgst_en) { + iscsi_data_digest_init(tcp_conn, ctask); + dtask->digest = 0; + } +solicit_again: + /* + * send Data-Out whitnin this R2T sequence. + */ + if (!r2t->data_count) + goto data_out_done; + + if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + /* will continue with this ctask later.. */ + if (conn->datadgst_en) { + crypto_digest_final(tcp_conn->data_tx_tfm, + (u8 *)&dtask->digest); + debug_tcp("r2t data send fail 0x%x\n", dtask->digest); + } + return -EAGAIN; + } + + BUG_ON(r2t->data_count < 0); + if (conn->datadgst_en) + crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, + 1); + + if (r2t->data_count) { + BUG_ON(ctask->sc->use_sg == 0); + if (!iscsi_buf_left(&r2t->sendbuf)) { + BUG_ON(tcp_ctask->bad_sg == r2t->sg); + iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); + r2t->sg += 1; + } + goto solicit_again; + } + +data_out_done: + /* + * Done with this Data-Out. Next, check if we have + * to send another Data-Out for this R2T. + */ + BUG_ON(r2t->data_length - r2t->sent < 0); + left = r2t->data_length - r2t->sent; + if (left) { + if (conn->datadgst_en) { + if (iscsi_digest_final_send(conn, ctask, + &dtask->digestbuf, + &dtask->digest, 1)) { + debug_tcp("send r2t data digest 0x%x" + "fail\n", dtask->digest); + return -EAGAIN; + } + debug_tcp("r2t data send digest 0x%x\n", + dtask->digest); + } + iscsi_solicit_data_cont(conn, ctask, r2t, left); + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; + return 1; + } + + /* + * Done with this R2T. Check if there are more + * outstanding R2Ts ready to be processed. + */ + BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); + if (conn->datadgst_en) { + if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, + &dtask->digest, 1)) { + debug_tcp("send last r2t data digest 0x%x" + "fail\n", dtask->digest); + return -EAGAIN; + } + debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); + } + + tcp_ctask->r2t_data_count -= r2t->data_length; + tcp_ctask->r2t = NULL; + spin_lock_bh(&session->lock); + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + spin_unlock_bh(&session->lock); + if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { + tcp_ctask->r2t = r2t; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; + return 1; + } + + return 0; +} + +static inline int +handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; + int sent; + + tcp_ctask->xmstate &= ~XMSTATE_W_PAD; + iscsi_buf_init_virt(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, + tcp_ctask->pad_count); + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, + &sent)) { + tcp_ctask->xmstate |= XMSTATE_W_PAD; + return -EAGAIN; + } + + if (conn->datadgst_en) { + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); + /* imm data? */ + if (!dtask) { + if (iscsi_digest_final_send(conn, ctask, + &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { + debug_tcp("send padding digest 0x%x" + "fail!\n", tcp_ctask->immdigest); + return -EAGAIN; + } + debug_tcp("done with padding, digest 0x%x\n", + tcp_ctask->datadigest); + } else { + if (iscsi_digest_final_send(conn, ctask, + &dtask->digestbuf, + &dtask->digest, 1)) { + debug_tcp("send padding digest 0x%x" + "fail\n", dtask->digest); + return -EAGAIN; + } + debug_tcp("done with padding, digest 0x%x\n", + dtask->digest); + } + } + + return 0; +} + +static int +iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + int rc = 0; + + debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", + conn->id, tcp_ctask->xmstate, ctask->itt); + + /* + * serialize with TMF AbortTask + */ + if (ctask->mtask) + return rc; + + if (tcp_ctask->xmstate & XMSTATE_R_HDR) { + rc = handle_xmstate_r_hdr(conn, tcp_ctask); + return rc; + } + + if (tcp_ctask->xmstate & XMSTATE_W_HDR) { + rc = handle_xmstate_w_hdr(conn, ctask); + if (rc) + return rc; + } + + /* XXX: for data digest xmit recover */ + if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { + rc = handle_xmstate_data_digest(conn, ctask); + if (rc) + return rc; + } + + if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { + rc = handle_xmstate_imm_data(conn, ctask); + if (rc) + return rc; + } + + if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { + BUG_ON(!ctask->unsol_count); + tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; +unsolicit_head_again: + rc = handle_xmstate_uns_hdr(conn, ctask); + if (rc) + return rc; + } + + if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { + rc = handle_xmstate_uns_data(conn, ctask); + if (rc == 1) + goto unsolicit_head_again; + else if (rc) + return rc; + goto done; + } + + if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { + struct iscsi_r2t_info *r2t; + + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + if (!tcp_ctask->r2t) + __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, + sizeof(void*)); +solicit_head_again: + r2t = tcp_ctask->r2t; + if (conn->hdrdgst_en) + iscsi_hdr_digest(conn, &r2t->headbuf, + (u8*)r2t->dtask->hdrext); + if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; + return -EAGAIN; + } + + debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n", + r2t->solicit_datasn - 1, ctask->itt, r2t->data_count, + r2t->sent); + } + + if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { + rc = handle_xmstate_sol_data(conn, ctask); + if (rc == 1) + goto solicit_head_again; + if (rc) + return rc; + } + +done: + /* + * Last thing to check is whether we need to send write + * padding. Note that we check for xmstate equality, not just the bit. + */ + if (tcp_ctask->xmstate == XMSTATE_W_PAD) + rc = handle_xmstate_w_pad(conn, ctask); + + return rc; +} + +static struct iscsi_cls_conn * +iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) +{ + struct iscsi_conn *conn; + struct iscsi_cls_conn *cls_conn; + struct iscsi_tcp_conn *tcp_conn; + + cls_conn = iscsi_conn_setup(cls_session, conn_idx); + if (!cls_conn) + return NULL; + conn = cls_conn->dd_data; + /* + * due to strange issues with iser these are not set + * in iscsi_conn_setup + */ + conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; + + tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); + if (!tcp_conn) + goto tcp_conn_alloc_fail; + + conn->dd_data = tcp_conn; + tcp_conn->iscsi_conn = conn; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + /* initial operational parameters */ + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); + tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; + + /* allocate initial PDU receive place holder */ + if (tcp_conn->data_size <= PAGE_SIZE) + tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); + else + tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, + get_order(tcp_conn->data_size)); + if (!tcp_conn->data) + goto max_recv_dlenght_alloc_fail; + + return cls_conn; + +max_recv_dlenght_alloc_fail: + kfree(tcp_conn); +tcp_conn_alloc_fail: + iscsi_conn_teardown(cls_conn); + return NULL; +} + +static void +iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int digest = 0; + + if (conn->hdrdgst_en || conn->datadgst_en) + digest = 1; + + iscsi_conn_teardown(cls_conn); + + /* now free tcp_conn */ + if (digest) { + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); + } + + /* free conn->data, size = MaxRecvDataSegmentLength */ + if (tcp_conn->data_size <= PAGE_SIZE) + kfree(tcp_conn->data); + else + free_pages((unsigned long)tcp_conn->data, + get_order(tcp_conn->data_size)); + kfree(tcp_conn); +} + +static int +iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, + struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, + int is_leading) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk; + struct socket *sock; + int err; + + /* lookup for existing socket */ + sock = sockfd_lookup(transport_fd, &err); + if (!sock) { + printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err); + return -EEXIST; + } + + err = iscsi_conn_bind(cls_session, cls_conn, is_leading); + if (err) + return err; + + if (conn->stop_stage != STOP_CONN_SUSPEND) { + /* bind iSCSI connection and socket */ + tcp_conn->sock = sock; + + /* setup Socket parameters */ + sk = sock->sk; + sk->sk_reuse = 1; + sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ + sk->sk_allocation = GFP_ATOMIC; + + /* FIXME: disable Nagle's algorithm */ + + /* + * Intercept TCP callbacks for sendfile like receive + * processing. + */ + conn->recv_lock = &sk->sk_callback_lock; + iscsi_conn_set_callbacks(conn); + tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; + /* + * set receive state machine into initial state + */ + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + } + + return 0; +} + +static void +iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_r2t_info *r2t; + + /* flush ctask's r2t queues */ + while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, + sizeof(void*)); + + __iscsi_ctask_cleanup(conn, ctask); +} + +static void +iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk; + + if (!tcp_conn->sock) + return; + + sk = tcp_conn->sock->sk; + write_lock_bh(&sk->sk_callback_lock); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + write_unlock_bh(&sk->sk_callback_lock); +} + +static void +iscsi_tcp_terminate_conn(struct iscsi_conn *conn) +{ + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + if (!tcp_conn->sock) + return; + + sock_hold(tcp_conn->sock->sk); + iscsi_conn_restore_callbacks(conn); + sock_put(tcp_conn->sock->sk); + + sock_release(tcp_conn->sock); + tcp_conn->sock = NULL; + conn->recv_lock = NULL; +} + +/* called with host lock */ +static void +iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, + char *data, uint32_t data_size) +{ + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; + + iscsi_buf_init_virt(&tcp_mtask->headbuf, (char*)mtask->hdr, + sizeof(struct iscsi_hdr)); + tcp_mtask->xmstate = XMSTATE_IMM_HDR; + + if (mtask->data_count) + iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, + mtask->data_count); +} + +static int +iscsi_r2tpool_alloc(struct iscsi_session *session) +{ + int i; + int cmd_i; + + /* + * initialize per-task: R2T pool and xmit queue + */ + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + /* + * pre-allocated x4 as much r2ts to handle race when + * target acks DataOut faster than we data_xmit() queues + * could replenish r2tqueue. + */ + + /* R2T pool */ + if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, + (void***)&tcp_ctask->r2ts, + sizeof(struct iscsi_r2t_info))) { + goto r2t_alloc_fail; + } + + /* R2T xmit queue */ + tcp_ctask->r2tqueue = kfifo_alloc( + session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); + if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); + goto r2t_alloc_fail; + } + + /* + * number of + * Data-Out PDU's within R2T-sequence can be quite big; + * using mempool + */ + tcp_ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, + taskcache); + if (tcp_ctask->datapool == NULL) { + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); + goto r2t_alloc_fail; + } + INIT_LIST_HEAD(&tcp_ctask->dataqueue); + } + + return 0; + +r2t_alloc_fail: + for (i = 0; i < cmd_i; i++) { + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); + } + return -ENOMEM; +} + +static void +iscsi_r2tpool_free(struct iscsi_session *session) +{ + int i; + + for (i = 0; i < session->cmds_max; i++) { + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); + } +} + +static int +iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, + uint32_t value) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + switch(param) { + case ISCSI_PARAM_MAX_RECV_DLENGTH: { + char *saveptr = tcp_conn->data; + gfp_t flags = GFP_KERNEL; + + if (tcp_conn->data_size >= value) { + conn->max_recv_dlength = value; + break; + } + + spin_lock_bh(&session->lock); + if (conn->stop_stage == STOP_CONN_RECOVER) + flags = GFP_ATOMIC; + spin_unlock_bh(&session->lock); + + if (value <= PAGE_SIZE) + tcp_conn->data = kmalloc(value, flags); + else + tcp_conn->data = (void*)__get_free_pages(flags, + get_order(value)); + if (tcp_conn->data == NULL) { + tcp_conn->data = saveptr; + return -ENOMEM; + } + if (tcp_conn->data_size <= PAGE_SIZE) + kfree(saveptr); + else + free_pages((unsigned long)saveptr, + get_order(tcp_conn->data_size)); + conn->max_recv_dlength = value; + tcp_conn->data_size = value; + } + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + conn->max_xmit_dlength = value; + break; + case ISCSI_PARAM_HDRDGST_EN: + conn->hdrdgst_en = value; + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); + if (conn->hdrdgst_en) { + tcp_conn->hdr_size += sizeof(__u32); + if (!tcp_conn->tx_tfm) + tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->tx_tfm) + return -ENOMEM; + if (!tcp_conn->rx_tfm) + tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->rx_tfm) { + crypto_free_tfm(tcp_conn->tx_tfm); + return -ENOMEM; + } + } else { + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); + } + break; + case ISCSI_PARAM_DATADGST_EN: + conn->datadgst_en = value; + if (conn->datadgst_en) { + if (!tcp_conn->data_tx_tfm) + tcp_conn->data_tx_tfm = + crypto_alloc_tfm("crc32c", 0); + if (!tcp_conn->data_tx_tfm) + return -ENOMEM; + if (!tcp_conn->data_rx_tfm) + tcp_conn->data_rx_tfm = + crypto_alloc_tfm("crc32c", 0); + if (!tcp_conn->data_rx_tfm) { + crypto_free_tfm(tcp_conn->data_tx_tfm); + return -ENOMEM; + } + } else { + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); + } + tcp_conn->sendpage = conn->datadgst_en ? + sock_no_sendpage : tcp_conn->sock->ops->sendpage; + break; + case ISCSI_PARAM_INITIAL_R2T_EN: + session->initial_r2t_en = value; + break; + case ISCSI_PARAM_MAX_R2T: + if (session->max_r2t == roundup_pow_of_two(value)) + break; + iscsi_r2tpool_free(session); + session->max_r2t = value; + if (session->max_r2t & (session->max_r2t - 1)) + session->max_r2t = roundup_pow_of_two(session->max_r2t); + if (iscsi_r2tpool_alloc(session)) + return -ENOMEM; + break; + case ISCSI_PARAM_IMM_DATA_EN: + session->imm_data_en = value; + break; + case ISCSI_PARAM_FIRST_BURST: + session->first_burst = value; + break; + case ISCSI_PARAM_MAX_BURST: + session->max_burst = value; + break; + case ISCSI_PARAM_PDU_INORDER_EN: + session->pdu_inorder_en = value; + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + session->dataseq_inorder_en = value; + break; + case ISCSI_PARAM_ERL: + session->erl = value; + break; + case ISCSI_PARAM_IFMARKER_EN: + BUG_ON(value); + session->ifmarker_en = value; + break; + case ISCSI_PARAM_OFMARKER_EN: + BUG_ON(value); + session->ofmarker_en = value; + break; + default: + break; + } + + return 0; +} + +static int +iscsi_session_get_param(struct iscsi_cls_session *cls_session, + enum iscsi_param param, uint32_t *value) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); + struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + + switch(param) { + case ISCSI_PARAM_INITIAL_R2T_EN: + *value = session->initial_r2t_en; + break; + case ISCSI_PARAM_MAX_R2T: + *value = session->max_r2t; + break; + case ISCSI_PARAM_IMM_DATA_EN: + *value = session->imm_data_en; + break; + case ISCSI_PARAM_FIRST_BURST: + *value = session->first_burst; + break; + case ISCSI_PARAM_MAX_BURST: + *value = session->max_burst; + break; + case ISCSI_PARAM_PDU_INORDER_EN: + *value = session->pdu_inorder_en; + break; + case ISCSI_PARAM_DATASEQ_INORDER_EN: + *value = session->dataseq_inorder_en; + break; + case ISCSI_PARAM_ERL: + *value = session->erl; + break; + case ISCSI_PARAM_IFMARKER_EN: + *value = session->ifmarker_en; + break; + case ISCSI_PARAM_OFMARKER_EN: + *value = session->ofmarker_en; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int +iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, uint32_t *value) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct inet_sock *inet; + + switch(param) { + case ISCSI_PARAM_MAX_RECV_DLENGTH: + *value = conn->max_recv_dlength; + break; + case ISCSI_PARAM_MAX_XMIT_DLENGTH: + *value = conn->max_xmit_dlength; + break; + case ISCSI_PARAM_HDRDGST_EN: + *value = conn->hdrdgst_en; + break; + case ISCSI_PARAM_DATADGST_EN: + *value = conn->datadgst_en; + break; + case ISCSI_PARAM_CONN_PORT: + mutex_lock(&conn->xmitmutex); + if (!tcp_conn->sock) { + mutex_unlock(&conn->xmitmutex); + return -EINVAL; + } + + inet = inet_sk(tcp_conn->sock->sk); + *value = be16_to_cpu(inet->dport); + mutex_unlock(&conn->xmitmutex); + default: + return -EINVAL; + } + + return 0; +} + +static int +iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, char *buf) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk; + struct inet_sock *inet; + struct ipv6_pinfo *np; + int len = 0; + + switch (param) { + case ISCSI_PARAM_CONN_ADDRESS: + mutex_lock(&conn->xmitmutex); + if (!tcp_conn->sock) { + mutex_unlock(&conn->xmitmutex); + return -EINVAL; + } + + sk = tcp_conn->sock->sk; + if (sk->sk_family == PF_INET) { + inet = inet_sk(sk); + len = sprintf(buf, "%u.%u.%u.%u\n", + NIPQUAD(inet->daddr)); + } else { + np = inet6_sk(sk); + len = sprintf(buf, + "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", + NIP6(np->daddr)); + } + mutex_unlock(&conn->xmitmutex); + break; + default: + return -EINVAL; + } + + return len; +} + +static void +iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + stats->txdata_octets = conn->txdata_octets; + stats->rxdata_octets = conn->rxdata_octets; + stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; + stats->dataout_pdus = conn->dataout_pdus_cnt; + stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; + stats->datain_pdus = conn->datain_pdus_cnt; + stats->r2t_pdus = conn->r2t_pdus_cnt; + stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; + stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; + stats->custom_length = 3; + strcpy(stats->custom[0].desc, "tx_sendpage_failures"); + stats->custom[0].value = tcp_conn->sendpage_failures_cnt; + strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); + stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; + strcpy(stats->custom[2].desc, "eh_abort_cnt"); + stats->custom[2].value = conn->eh_abort_cnt; +} + +static struct iscsi_cls_session * +iscsi_tcp_session_create(struct iscsi_transport *iscsit, + struct scsi_transport_template *scsit, + uint32_t initial_cmdsn, uint32_t *hostno) +{ + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + uint32_t hn; + int cmd_i; + + cls_session = iscsi_session_setup(iscsit, scsit, + sizeof(struct iscsi_tcp_cmd_task), + sizeof(struct iscsi_tcp_mgmt_task), + initial_cmdsn, &hn); + if (!cls_session) + return NULL; + *hostno = hn; + + session = class_to_transport_session(cls_session); + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + ctask->hdr = &tcp_ctask->hdr; + } + + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { + struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; + + mtask->hdr = &tcp_mtask->hdr; + } + + if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) + goto r2tpool_alloc_fail; + + return cls_session; + +r2tpool_alloc_fail: + iscsi_session_teardown(cls_session); + return NULL; +} + +static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_data_task *dtask, *n; + int cmd_i; + + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { + list_del(&dtask->item); + mempool_free(dtask, tcp_ctask->datapool); + } + } + + iscsi_r2tpool_free(class_to_transport_session(cls_session)); + iscsi_session_teardown(cls_session); +} + +static struct scsi_host_template iscsi_sht = { + .name = "iSCSI Initiator over TCP/IP, v." + ISCSI_VERSION_STR, + .queuecommand = iscsi_queuecommand, + .change_queue_depth = iscsi_change_queue_depth, + .can_queue = ISCSI_XMIT_CMDS_MAX - 1, + .sg_tablesize = ISCSI_SG_TABLESIZE, + .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .eh_host_reset_handler = iscsi_eh_host_reset, + .use_clustering = DISABLE_CLUSTERING, + .proc_name = "iscsi_tcp", + .this_id = -1, +}; + +static struct iscsi_transport iscsi_tcp_transport = { + .owner = THIS_MODULE, + .name = "tcp", + .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST + | CAP_DATADGST, + .param_mask = ISCSI_MAX_RECV_DLENGTH | + ISCSI_MAX_XMIT_DLENGTH | + ISCSI_HDRDGST_EN | + ISCSI_DATADGST_EN | + ISCSI_INITIAL_R2T_EN | + ISCSI_MAX_R2T | + ISCSI_IMM_DATA_EN | + ISCSI_FIRST_BURST | + ISCSI_MAX_BURST | + ISCSI_PDU_INORDER_EN | + ISCSI_DATASEQ_INORDER_EN | + ISCSI_ERL | + ISCSI_CONN_PORT | + ISCSI_CONN_ADDRESS, + .host_template = &iscsi_sht, + .conndata_size = sizeof(struct iscsi_conn), + .max_conn = 1, + .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, + /* session management */ + .create_session = iscsi_tcp_session_create, + .destroy_session = iscsi_tcp_session_destroy, + /* connection management */ + .create_conn = iscsi_tcp_conn_create, + .bind_conn = iscsi_tcp_conn_bind, + .destroy_conn = iscsi_tcp_conn_destroy, + .set_param = iscsi_conn_set_param, + .get_conn_param = iscsi_conn_get_param, + .get_conn_str_param = iscsi_conn_get_str_param, + .get_session_param = iscsi_session_get_param, + .start_conn = iscsi_conn_start, + .stop_conn = iscsi_conn_stop, + /* these are called as part of conn recovery */ + .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, + .terminate_conn = iscsi_tcp_terminate_conn, + /* IO */ + .send_pdu = iscsi_conn_send_pdu, + .get_stats = iscsi_conn_get_stats, + .init_cmd_task = iscsi_tcp_cmd_init, + .init_mgmt_task = iscsi_tcp_mgmt_init, + .xmit_cmd_task = iscsi_tcp_ctask_xmit, + .xmit_mgmt_task = iscsi_tcp_mtask_xmit, + .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, + /* recovery */ + .session_recovery_timedout = iscsi_session_recovery_timedout, +}; + +static int __init +iscsi_tcp_init(void) +{ + if (iscsi_max_lun < 1) { + printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); + return -EINVAL; + } + iscsi_tcp_transport.max_lun = iscsi_max_lun; + + taskcache = kmem_cache_create("iscsi_taskcache", + sizeof(struct iscsi_data_task), 0, + SLAB_HWCACHE_ALIGN, NULL, NULL); + if (!taskcache) + return -ENOMEM; + + if (!iscsi_register_transport(&iscsi_tcp_transport)) + kmem_cache_destroy(taskcache); + + return 0; +} + +static void __exit +iscsi_tcp_exit(void) +{ + iscsi_unregister_transport(&iscsi_tcp_transport); + kmem_cache_destroy(taskcache); +} + +module_init(iscsi_tcp_init); +module_exit(iscsi_tcp_exit); diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index 12ef64179b4..c5918854d59 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -2,7 +2,8 @@ * iSCSI Initiator TCP Transport * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -21,20 +22,7 @@ #ifndef ISCSI_TCP_H #define ISCSI_TCP_H -/* Session's states */ -#define ISCSI_STATE_FREE 1 -#define ISCSI_STATE_LOGGED_IN 2 -#define ISCSI_STATE_FAILED 3 -#define ISCSI_STATE_TERMINATE 4 - -/* Connection's states */ -#define ISCSI_CONN_INITIAL_STAGE 0 -#define ISCSI_CONN_STARTED 1 -#define ISCSI_CONN_STOPPED 2 -#define ISCSI_CONN_CLEANUP_WAIT 3 - -/* Connection suspend "bit" */ -#define SUSPEND_BIT 1 +#include /* Socket's Receive state machine */ #define IN_PROGRESS_WAIT_HEADER 0x0 @@ -42,12 +30,6 @@ #define IN_PROGRESS_DATA_RECV 0x2 #define IN_PROGRESS_DDIGEST_RECV 0x3 -/* Task Mgmt states */ -#define TMABORT_INITIAL 0x0 -#define TMABORT_SUCCESS 0x1 -#define TMABORT_FAILED 0x2 -#define TMABORT_TIMEDOUT 0x3 - /* xmit state machine */ #define XMSTATE_IDLE 0x0 #define XMSTATE_R_HDR 0x1 @@ -62,34 +44,14 @@ #define XMSTATE_W_PAD 0x200 #define XMSTATE_DATA_DIGEST 0x400 -#define ISCSI_CONN_MAX 1 #define ISCSI_CONN_RCVBUF_MIN 262144 #define ISCSI_CONN_SNDBUF_MIN 262144 #define ISCSI_PAD_LEN 4 #define ISCSI_R2T_MAX 16 -#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ -#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ -#define ISCSI_MGMT_ITT_OFFSET 0xa00 #define ISCSI_SG_TABLESIZE SG_ALL -#define ISCSI_DEF_CMD_PER_LUN 32 -#define ISCSI_MAX_CMD_PER_LUN 128 #define ISCSI_TCP_MAX_CMD_LEN 16 -#define ITT_MASK (0xfff) -#define CID_SHIFT 12 -#define CID_MASK (0xffff<