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 #include <linux/kthread.h>
  22
  23 #include "usbip_common.h"
  24 #include "vhci.h"
  25
  26
  27 static void setup_cmd_submit_pdu(struct usbip_header *pdup,  struct urb *urb)
  28 {
  29         struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
  30         struct vhci_device *vdev = priv->vdev;
  31
  32         usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
  33                                 usb_pipedevice(urb->pipe), vdev->devid);
  34
  35         pdup->base.command = USBIP_CMD_SUBMIT;
  36         pdup->base.seqnum  = priv->seqnum;
  37         pdup->base.devid   = vdev->devid;
  38         if (usb_pipein(urb->pipe))
  39                 pdup->base.direction = USBIP_DIR_IN;
  40         else
  41                 pdup->base.direction = USBIP_DIR_OUT;
  42         pdup->base.ep      = usb_pipeendpoint(urb->pipe);
  43
  44         usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1);
  45
  46         if (urb->setup_packet)
  47                 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
  48 }
  49
  50 static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
  51 {
  52         unsigned long flags;
  53         struct vhci_priv *priv, *tmp;
  54
  55         spin_lock_irqsave(&vdev->priv_lock, flags);
  56
  57         list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
  58                 list_move_tail(&priv->list, &vdev->priv_rx);
  59                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
  60                 return priv;
  61         }
  62
  63         spin_unlock_irqrestore(&vdev->priv_lock, flags);
  64
  65         return NULL;
  66 }
  67
  68
  69
  70 static int vhci_send_cmd_submit(struct vhci_device *vdev)
  71 {
  72         struct vhci_priv *priv = NULL;
  73
  74         struct msghdr msg;
  75         struct kvec iov[3];
  76         size_t txsize;
  77
  78         size_t total_size = 0;
  79
  80         while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
  81                 int ret;
  82                 struct urb *urb = priv->urb;
  83                 struct usbip_header pdu_header;
  84                 void *iso_buffer = NULL;
  85
  86                 txsize = 0;
  87                 memset(&pdu_header, 0, sizeof(pdu_header));
  88                 memset(&msg, 0, sizeof(msg));
  89                 memset(&iov, 0, sizeof(iov));
  90
  91                 usbip_dbg_vhci_tx("setup txdata urb %p\n", urb);
  92
  93
  94                 /* 1. setup usbip_header */
  95                 setup_cmd_submit_pdu(&pdu_header, urb);
  96                 usbip_header_correct_endian(&pdu_header, 1);
  97
  98                 iov[0].iov_base = &pdu_header;
  99                 iov[0].iov_len  = sizeof(pdu_header);
 100                 txsize += sizeof(pdu_header);
 101
 102                 /* 2. setup transfer buffer */
 103                 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
 104                         iov[1].iov_base = urb->transfer_buffer;
 105                         iov[1].iov_len  = urb->transfer_buffer_length;
 106                         txsize += urb->transfer_buffer_length;
 107                 }
 108
 109                 /* 3. setup iso_packet_descriptor */
 110                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 111                         ssize_t len = 0;
 112
 113                         iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
 114                         if (!iso_buffer) {
 115                                 usbip_event_add(&vdev->ud,
 116                                                 SDEV_EVENT_ERROR_MALLOC);
 117                                 return -1;
 118                         }
 119
 120                         iov[2].iov_base = iso_buffer;
 121                         iov[2].iov_len  = len;
 122                         txsize += len;
 123                 }
 124
 125                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
 126                 if (ret != txsize) {
 127                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 128                                                                         txsize);
 129                         kfree(iso_buffer);
 130                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 131                         return -1;
 132                 }
 133
 134                 kfree(iso_buffer);
 135                 usbip_dbg_vhci_tx("send txdata\n");
 136
 137                 total_size += txsize;
 138         }
 139
 140         return total_size;
 141 }
 142
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
 147 {
 148         unsigned long flags;
 149         struct vhci_unlink *unlink, *tmp;
 150
 151         spin_lock_irqsave(&vdev->priv_lock, flags);
 152
 153         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 154                 list_move_tail(&unlink->list, &vdev->unlink_rx);
 155                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
 156                 return unlink;
 157         }
 158
 159         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 160
 161         return NULL;
 162 }
 163
 164 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
 165 {
 166         struct vhci_unlink *unlink = NULL;
 167
 168         struct msghdr msg;
 169         struct kvec iov[3];
 170         size_t txsize;
 171
 172         size_t total_size = 0;
 173
 174         while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
 175                 int ret;
 176                 struct usbip_header pdu_header;
 177
 178                 txsize = 0;
 179                 memset(&pdu_header, 0, sizeof(pdu_header));
 180                 memset(&msg, 0, sizeof(msg));
 181                 memset(&iov, 0, sizeof(iov));
 182
 183                 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
 184
 185
 186                 /* 1. setup usbip_header */
 187                 pdu_header.base.command = USBIP_CMD_UNLINK;
 188                 pdu_header.base.seqnum  = unlink->seqnum;
 189                 pdu_header.base.devid   = vdev->devid;
 190                 pdu_header.base.ep      = 0;
 191                 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
 192
 193                 usbip_header_correct_endian(&pdu_header, 1);
 194
 195                 iov[0].iov_base = &pdu_header;
 196                 iov[0].iov_len  = sizeof(pdu_header);
 197                 txsize += sizeof(pdu_header);
 198
 199                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
 200                 if (ret != txsize) {
 201                         usbip_uerr("sendmsg failed!, retval %d for %zd\n", ret,
 202                                                                         txsize);
 203                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 204                         return -1;
 205                 }
 206
 207
 208                 usbip_dbg_vhci_tx("send txdata\n");
 209
 210                 total_size += txsize;
 211         }
 212
 213         return total_size;
 214 }
 215
 216
 217 /*-------------------------------------------------------------------------*/
 218
 219 int vhci_tx_loop(void *data)
 220 {
 221         struct usbip_device *ud = data;
 222         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 223
 224         while (!kthread_should_stop()) {
 225                 if (vhci_send_cmd_submit(vdev) < 0)
 226                         break;
 227
 228                 if (vhci_send_cmd_unlink(vdev) < 0)
 229                         break;
 230
 231                 wait_event_interruptible(vdev->waitq_tx,
 232                                 (!list_empty(&vdev->priv_tx) ||
 233                                  !list_empty(&vdev->unlink_tx) ||
 234                                  kthread_should_stop()));
 235
 236                 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 237         }
 238
 239         return 0;
 240 }