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 "usbip_common.h"
  21 #include "vhci.h"
  22
  23
  24 static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
  25 {
  26         struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
  27         struct vhci_device *vdev = priv->vdev;
  28
  29         usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
  30                                 usb_pipedevice(urb->pipe), vdev->devid);
  31
  32         pdup->base.command = USBIP_CMD_SUBMIT;
  33         pdup->base.seqnum  = priv->seqnum;
  34         pdup->base.devid   = vdev->devid;
  35         if (usb_pipein(urb->pipe))
  36                 pdup->base.direction = USBIP_DIR_IN;
  37         else
  38                 pdup->base.direction = USBIP_DIR_OUT;
  39         pdup->base.ep      = usb_pipeendpoint(urb->pipe);
  40
  41         usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);
  42
  43         if (urb->setup_packet)
  44                 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
  45 }
  46
  47 static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
  48 {
  49         unsigned long flags;
  50         struct vhci_priv *priv, *tmp;
  51
  52         spin_lock_irqsave(&vdev->priv_lock, flags);
  53
  54         list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
  55                 list_move_tail(&priv->list, &vdev->priv_rx);
  56                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
  57                 return priv;
  58         }
  59
  60         spin_unlock_irqrestore(&vdev->priv_lock, flags);
  61
  62         return NULL;
  63 }
  64
  65
  66
  67 static int vhci_send_cmd_submit(struct vhci_device *vdev)
  68 {
  69         struct vhci_priv *priv = NULL;
  70
  71         struct msghdr msg;
  72         struct kvec iov[3];
  73         size_t txsize;
  74
  75         size_t total_size = 0;
  76
  77         while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
  78                 int ret;
  79                 struct urb *urb = priv->urb;
  80                 struct usbip_header pdu_header;
  81                 void *iso_buffer = NULL;
  82
  83                 txsize = 0;
  84                 memset(&pdu_header, 0, sizeof(pdu_header));
  85                 memset(&msg, 0, sizeof(msg));
  86                 memset(&iov, 0, sizeof(iov));
  87
  88                 usbip_dbg_vhci_tx("setup txdata urb %p\n", urb);
  89
  90
  91                 /* 1. setup usbip_header */
  92                 setup_cmd_submit_pdu(&pdu_header, urb);
  93                 usbip_header_correct_endian(&pdu_header, 1);
  94
  95                 iov[0].iov_base = &pdu_header;
  96                 iov[0].iov_len  = sizeof(pdu_header);
  97                 txsize += sizeof(pdu_header);
  98
  99                 /* 2. setup transfer buffer */
 100                 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
 101                         iov[1].iov_base = urb->transfer_buffer;
 102                         iov[1].iov_len  = urb->transfer_buffer_length;
 103                         txsize += urb->transfer_buffer_length;
 104                 }
 105
 106                 /* 3. setup iso_packet_descriptor */
 107                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 108                         ssize_t len = 0;
 109
 110                         iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
 111                         if (!iso_buffer) {
 112                                 usbip_event_add(&vdev->ud,
 113                                                 SDEV_EVENT_ERROR_MALLOC);
 114                                 return -1;
 115                         }
 116
 117                         iov[2].iov_base = iso_buffer;
 118                         iov[2].iov_len  = len;
 119                         txsize += len;
 120                 }
 121
 122                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
 123                 if (ret != txsize) {
 124                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 125                                                                         txsize);
 126                         kfree(iso_buffer);
 127                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 128                         return -1;
 129                 }
 130
 131                 kfree(iso_buffer);
 132                 usbip_dbg_vhci_tx("send txdata\n");
 133
 134                 total_size += txsize;
 135         }
 136
 137         return total_size;
 138 }
 139
 140
 141 /*-------------------------------------------------------------------------*/
 142
 143 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
 144 {
 145         unsigned long flags;
 146         struct vhci_unlink *unlink, *tmp;
 147
 148         spin_lock_irqsave(&vdev->priv_lock, flags);
 149
 150         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 151                 list_move_tail(&unlink->list, &vdev->unlink_rx);
 152                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
 153                 return unlink;
 154         }
 155
 156         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 157
 158         return NULL;
 159 }
 160
 161 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
 162 {
 163         struct vhci_unlink *unlink = NULL;
 164
 165         struct msghdr msg;
 166         struct kvec iov[3];
 167         size_t txsize;
 168
 169         size_t total_size = 0;
 170
 171         while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
 172                 int ret;
 173                 struct usbip_header pdu_header;
 174
 175                 txsize = 0;
 176                 memset(&pdu_header, 0, sizeof(pdu_header));
 177                 memset(&msg, 0, sizeof(msg));
 178                 memset(&iov, 0, sizeof(iov));
 179
 180                 usbip_dbg_vhci_tx("setup cmd unlink, %lu \n", unlink->seqnum);
 181
 182
 183                 /* 1. setup usbip_header */
 184                 pdu_header.base.command = USBIP_CMD_UNLINK;
 185                 pdu_header.base.seqnum  = unlink->seqnum;
 186                 pdu_header.base.devid   = vdev->devid;
 187                 pdu_header.base.ep      = 0;
 188                 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
 189
 190                 usbip_header_correct_endian(&pdu_header, 1);
 191
 192                 iov[0].iov_base = &pdu_header;
 193                 iov[0].iov_len  = sizeof(pdu_header);
 194                 txsize += sizeof(pdu_header);
 195
 196                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
 197                 if (ret != txsize) {
 198                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 199                                                                         txsize);
 200                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 201                         return -1;
 202                 }
 203
 204
 205                 usbip_dbg_vhci_tx("send txdata\n");
 206
 207                 total_size += txsize;
 208         }
 209
 210         return total_size;
 211 }
 212
 213
 214 /*-------------------------------------------------------------------------*/
 215
 216 void vhci_tx_loop(struct usbip_task *ut)
 217 {
 218         struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_tx);
 219         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 220
 221         while (1) {
 222                 if (signal_pending(current)) {
 223                         usbip_uinfo("vhci_tx signal catched\n");
 224                         break;
 225                 }
 226
 227                 if (vhci_send_cmd_submit(vdev) < 0)
 228                         break;
 229
 230                 if (vhci_send_cmd_unlink(vdev) < 0)
 231                         break;
 232
 233                 wait_event_interruptible(vdev->waitq_tx,
 234                                 (!list_empty(&vdev->priv_tx) ||
 235                                  !list_empty(&vdev->unlink_tx)));
 236
 237                 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 238         }
 239 }