release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/usbip/vhci_tx.c

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  *
   4  * This is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  */
  19
  20 #include <linux/slab.h>
  21
  22 #include "usbip_common.h"
  23 #include "vhci.h"
  24
  25
  26 static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
  27 {
  28         struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
  29         struct vhci_device *vdev = priv->vdev;
  30
  31         usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
  32                                 usb_pipedevice(urb->pipe), vdev->devid);
  33
  34         pdup->base.command = USBIP_CMD_SUBMIT;
  35         pdup->base.seqnum  = priv->seqnum;
  36         pdup->base.devid   = vdev->devid;
  37         if (usb_pipein(urb->pipe))
  38                 pdup->base.direction = USBIP_DIR_IN;
  39         else
  40                 pdup->base.direction = USBIP_DIR_OUT;
  41         pdup->base.ep      = usb_pipeendpoint(urb->pipe);
  42
  43         usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);
  44
  45         if (urb->setup_packet)
  46                 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
  47 }
  48
  49 static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
  50 {
  51         unsigned long flags;
  52         struct vhci_priv *priv, *tmp;
  53
  54         spin_lock_irqsave(&vdev->priv_lock, flags);
  55
  56         list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
  57                 list_move_tail(&priv->list, &vdev->priv_rx);
  58                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
  59                 return priv;
  60         }
  61
  62         spin_unlock_irqrestore(&vdev->priv_lock, flags);
  63
  64         return NULL;
  65 }
  66
  67
  68
  69 static int vhci_send_cmd_submit(struct vhci_device *vdev)
  70 {
  71         struct vhci_priv *priv = NULL;
  72
  73         struct msghdr msg;
  74         struct kvec iov[3];
  75         size_t txsize;
  76
  77         size_t total_size = 0;
  78
  79         while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
  80                 int ret;
  81                 struct urb *urb = priv->urb;
  82                 struct usbip_header pdu_header;
  83                 void *iso_buffer = NULL;
  84
  85                 txsize = 0;
  86                 memset(&pdu_header, 0, sizeof(pdu_header));
  87                 memset(&msg, 0, sizeof(msg));
  88                 memset(&iov, 0, sizeof(iov));
  89
  90                 usbip_dbg_vhci_tx("setup txdata urb %p\n", urb);
  91
  92
  93                 /* 1. setup usbip_header */
  94                 setup_cmd_submit_pdu(&pdu_header, urb);
  95                 usbip_header_correct_endian(&pdu_header, 1);
  96
  97                 iov[0].iov_base = &pdu_header;
  98                 iov[0].iov_len  = sizeof(pdu_header);
  99                 txsize += sizeof(pdu_header);
 100
 101                 /* 2. setup transfer buffer */
 102                 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
 103                         iov[1].iov_base = urb->transfer_buffer;
 104                         iov[1].iov_len  = urb->transfer_buffer_length;
 105                         txsize += urb->transfer_buffer_length;
 106                 }
 107
 108                 /* 3. setup iso_packet_descriptor */
 109                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 110                         ssize_t len = 0;
 111
 112                         iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
 113                         if (!iso_buffer) {
 114                                 usbip_event_add(&vdev->ud,
 115                                                 SDEV_EVENT_ERROR_MALLOC);
 116                                 return -1;
 117                         }
 118
 119                         iov[2].iov_base = iso_buffer;
 120                         iov[2].iov_len  = len;
 121                         txsize += len;
 122                 }
 123
 124                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
 125                 if (ret != txsize) {
 126                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 127                                                                         txsize);
 128                         kfree(iso_buffer);
 129                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 130                         return -1;
 131                 }
 132
 133                 kfree(iso_buffer);
 134                 usbip_dbg_vhci_tx("send txdata\n");
 135
 136                 total_size += txsize;
 137         }
 138
 139         return total_size;
 140 }
 141
 142
 143 /*-------------------------------------------------------------------------*/
 144
 145 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
 146 {
 147         unsigned long flags;
 148         struct vhci_unlink *unlink, *tmp;
 149
 150         spin_lock_irqsave(&vdev->priv_lock, flags);
 151
 152         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 153                 list_move_tail(&unlink->list, &vdev->unlink_rx);
 154                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
 155                 return unlink;
 156         }
 157
 158         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 159
 160         return NULL;
 161 }
 162
 163 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
 164 {
 165         struct vhci_unlink *unlink = NULL;
 166
 167         struct msghdr msg;
 168         struct kvec iov[3];
 169         size_t txsize;
 170
 171         size_t total_size = 0;
 172
 173         while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
 174                 int ret;
 175                 struct usbip_header pdu_header;
 176
 177                 txsize = 0;
 178                 memset(&pdu_header, 0, sizeof(pdu_header));
 179                 memset(&msg, 0, sizeof(msg));
 180                 memset(&iov, 0, sizeof(iov));
 181
 182                 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
 183
 184
 185                 /* 1. setup usbip_header */
 186                 pdu_header.base.command = USBIP_CMD_UNLINK;
 187                 pdu_header.base.seqnum  = unlink->seqnum;
 188                 pdu_header.base.devid   = vdev->devid;
 189                 pdu_header.base.ep      = 0;
 190                 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
 191
 192                 usbip_header_correct_endian(&pdu_header, 1);
 193
 194                 iov[0].iov_base = &pdu_header;
 195                 iov[0].iov_len  = sizeof(pdu_header);
 196                 txsize += sizeof(pdu_header);
 197
 198                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
 199                 if (ret != txsize) {
 200                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 201                                                                         txsize);
 202                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 203                         return -1;
 204                 }
 205
 206
 207                 usbip_dbg_vhci_tx("send txdata\n");
 208
 209                 total_size += txsize;
 210         }
 211
 212         return total_size;
 213 }
 214
 215
 216 /*-------------------------------------------------------------------------*/
 217
 218 void vhci_tx_loop(struct usbip_task *ut)
 219 {
 220         struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_tx);
 221         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 222
 223         while (1) {
 224                 if (signal_pending(current)) {
 225                         usbip_uinfo("vhci_tx signal catched\n");
 226                         break;
 227                 }
 228
 229                 if (vhci_send_cmd_submit(vdev) < 0)
 230                         break;
 231
 232                 if (vhci_send_cmd_unlink(vdev) < 0)
 233                         break;
 234
 235                 wait_event_interruptible(vdev->waitq_tx,
 236                                 (!list_empty(&vdev->priv_tx) ||
 237                                  !list_empty(&vdev->unlink_tx)));
 238
 239                 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 240         }
 241 }