release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/scsi/iscsi_tcp.h

   1 /*
   2  * iSCSI Initiator TCP Transport
   3  * Copyright (C) 2004 Dmitry Yusupov
   4  * Copyright (C) 2004 Alex Aizman
   5  * Copyright (C) 2005 - 2006 Mike Christie
   6  * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
   7  * maintained by open-iscsi@googlegroups.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published
  11  * by the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * See the file COPYING included with this distribution for more details.
  20  */
  21
  22 #ifndef ISCSI_SW_TCP_H
  23 #define ISCSI_SW_TCP_H
  24
  25 #include <scsi/libiscsi.h>
  26 #include <scsi/libiscsi_tcp.h>
  27
  28 struct socket;
  29 struct iscsi_tcp_conn;
  30
  31 /* Socket connection send helper */
  32 struct iscsi_sw_tcp_send {
  33         struct iscsi_hdr        *hdr;
  34         struct iscsi_segment    segment;
  35         struct iscsi_segment    data_segment;
  36 };
  37
  38 struct iscsi_sw_tcp_conn {
  39         struct socket           *sock;
  40
  41         struct iscsi_sw_tcp_send out;
  42         /* old values for socket callbacks */
  43         void                    (*old_data_ready)(struct sock *, int);
  44         void                    (*old_state_change)(struct sock *);
  45         void                    (*old_write_space)(struct sock *);
  46
  47         /* data and header digests */
  48         struct hash_desc        tx_hash;        /* CRC32C (Tx) */
  49         struct hash_desc        rx_hash;        /* CRC32C (Rx) */
  50
  51         /* MIB custom statistics */
  52         uint32_t                sendpage_failures_cnt;
  53         uint32_t                discontiguous_hdr_cnt;
  54
  55         ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
  56 };
  57
  58 struct iscsi_sw_tcp_hdrbuf {
  59         struct iscsi_hdr        hdrbuf;
  60         char                    hdrextbuf[ISCSI_MAX_AHS_SIZE +
  61                                                   ISCSI_DIGEST_SIZE];
  62 };
  63
  64 #endif /* ISCSI_SW_TCP_H */