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 seqnum %lu\n",
  87                                   priv->seqnum);
  88
  89                 /* 1. setup usbip_header */
  90                 setup_cmd_submit_pdu(&pdu_header, urb);
  91                 usbip_header_correct_endian(&pdu_header, 1);
  92
  93                 iov[0].iov_base = &pdu_header;
  94                 iov[0].iov_len  = sizeof(pdu_header);
  95                 txsize += sizeof(pdu_header);
  96
  97                 /* 2. setup transfer buffer */
  98                 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
  99                         iov[1].iov_base = urb->transfer_buffer;
 100                         iov[1].iov_len  = urb->transfer_buffer_length;
 101                         txsize += urb->transfer_buffer_length;
 102                 }
 103
 104                 /* 3. setup iso_packet_descriptor */
 105                 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
 106                         ssize_t len = 0;
 107
 108                         iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len);
 109                         if (!iso_buffer) {
 110                                 usbip_event_add(&vdev->ud,
 111                                                 SDEV_EVENT_ERROR_MALLOC);
 112                                 return -1;
 113                         }
 114
 115                         iov[2].iov_base = iso_buffer;
 116                         iov[2].iov_len  = len;
 117                         txsize += len;
 118                 }
 119
 120                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 3, txsize);
 121                 if (ret != txsize) {
 122                         pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
 123                                txsize);
 124                         kfree(iso_buffer);
 125                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 126                         return -1;
 127                 }
 128
 129                 kfree(iso_buffer);
 130                 usbip_dbg_vhci_tx("send txdata\n");
 131
 132                 total_size += txsize;
 133         }
 134
 135         return total_size;
 136 }
 137
 138 static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
 139 {
 140         unsigned long flags;
 141         struct vhci_unlink *unlink, *tmp;
 142
 143         spin_lock_irqsave(&vdev->priv_lock, flags);
 144
 145         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 146                 list_move_tail(&unlink->list, &vdev->unlink_rx);
 147                 spin_unlock_irqrestore(&vdev->priv_lock, flags);
 148                 return unlink;
 149         }
 150
 151         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 152
 153         return NULL;
 154 }
 155
 156 static int vhci_send_cmd_unlink(struct vhci_device *vdev)
 157 {
 158         struct vhci_unlink *unlink = NULL;
 159
 160         struct msghdr msg;
 161         struct kvec iov[3];
 162         size_t txsize;
 163
 164         size_t total_size = 0;
 165
 166         while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
 167                 int ret;
 168                 struct usbip_header pdu_header;
 169
 170                 txsize = 0;
 171                 memset(&pdu_header, 0, sizeof(pdu_header));
 172                 memset(&msg, 0, sizeof(msg));
 173                 memset(&iov, 0, sizeof(iov));
 174
 175                 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
 176
 177                 /* 1. setup usbip_header */
 178                 pdu_header.base.command = USBIP_CMD_UNLINK;
 179                 pdu_header.base.seqnum  = unlink->seqnum;
 180                 pdu_header.base.devid   = vdev->devid;
 181                 pdu_header.base.ep      = 0;
 182                 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
 183
 184                 usbip_header_correct_endian(&pdu_header, 1);
 185
 186                 iov[0].iov_base = &pdu_header;
 187                 iov[0].iov_len  = sizeof(pdu_header);
 188                 txsize += sizeof(pdu_header);
 189
 190                 ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, 1, txsize);
 191                 if (ret != txsize) {
 192                         pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
 193                                txsize);
 194                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP);
 195                         return -1;
 196                 }
 197
 198                 usbip_dbg_vhci_tx("send txdata\n");
 199
 200                 total_size += txsize;
 201         }
 202
 203         return total_size;
 204 }
 205
 206 int vhci_tx_loop(void *data)
 207 {
 208         struct usbip_device *ud = data;
 209         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 210
 211         while (!kthread_should_stop()) {
 212                 if (vhci_send_cmd_submit(vdev) < 0)
 213                         break;
 214
 215                 if (vhci_send_cmd_unlink(vdev) < 0)
 216                         break;
 217
 218                 wait_event_interruptible(vdev->waitq_tx,
 219                                          (!list_empty(&vdev->priv_tx) ||
 220                                           !list_empty(&vdev->unlink_tx) ||
 221                                           kthread_should_stop()));
 222
 223                 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 224         }
 225
 226         return 0;
 227 }