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