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vhci_rx.c

/*
 * Copyright (C) 2003-2008 Takahiro Hirofuchi
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#include "usbip_common.h"
#include "vhci.h"


/* get URB from transmitted urb queue */
static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
                                  __u32 seqnum)
{
      struct vhci_priv *priv, *tmp;
      struct urb *urb = NULL;
      int status;

      spin_lock(&vdev->priv_lock);

      list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
            if (priv->seqnum == seqnum) {
                  urb = priv->urb;
                  status = urb->status;

                  dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
                            urb, priv, seqnum);

                  /* TODO: fix logic here to improve indent situtation */
                  if (status != -EINPROGRESS) {
                        if (status == -ENOENT ||
                             status == -ECONNRESET)
                              dev_info(&urb->dev->dev,
                                     "urb %p was unlinked "
                                     "%ssynchronuously.\n", urb,
                                     status == -ENOENT ? "" : "a");
                        else
                              dev_info(&urb->dev->dev,
                                     "urb %p may be in a error, "
                                     "status %d\n", urb, status);
                  }

                  list_del(&priv->list);
                  kfree(priv);
                  urb->hcpriv = NULL;

                  break;
            }
      }

      spin_unlock(&vdev->priv_lock);

      return urb;
}

static void vhci_recv_ret_submit(struct vhci_device *vdev,
                                    struct usbip_header *pdu)
{
      struct usbip_device *ud = &vdev->ud;
      struct urb *urb;


      urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);


      if (!urb) {
            uerr("cannot find a urb of seqnum %u\n", pdu->base.seqnum);
            uinfo("max seqnum %d\n", atomic_read(&the_controller->seqnum));
            usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
            return;
      }


      /* unpack the pdu to a urb */
      usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);


      /* recv transfer buffer */
      if (usbip_recv_xbuff(ud, urb) < 0)
            return;


      /* recv iso_packet_descriptor */
      if (usbip_recv_iso(ud, urb) < 0)
            return;


      if (dbg_flag_vhci_rx)
            usbip_dump_urb(urb);


      dbg_vhci_rx("now giveback urb %p\n", urb);

      spin_lock(&the_controller->lock);
      usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
      spin_unlock(&the_controller->lock);

      usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);


      dbg_vhci_rx("Leave\n");

      return;
}


static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
            struct usbip_header *pdu)
{
      struct vhci_unlink *unlink, *tmp;

      spin_lock(&vdev->priv_lock);

      list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
            uinfo("unlink->seqnum %lu\n", unlink->seqnum);
            if (unlink->seqnum == pdu->base.seqnum) {
                  dbg_vhci_rx("found pending unlink, %lu\n",
                                          unlink->seqnum);
                  list_del(&unlink->list);

                  spin_unlock(&vdev->priv_lock);
                  return unlink;
            }
      }

      spin_unlock(&vdev->priv_lock);

      return NULL;
}


static void vhci_recv_ret_unlink(struct vhci_device *vdev,
                                    struct usbip_header *pdu)
{
      struct vhci_unlink *unlink;
      struct urb *urb;

      usbip_dump_header(pdu);

      unlink = dequeue_pending_unlink(vdev, pdu);
      if (!unlink) {
            uinfo("cannot find the pending unlink %u\n", pdu->base.seqnum);
            return;
      }

      urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
      if (!urb) {
            /*
             * I get the result of a unlink request. But, it seems that I
             * already received the result of its submit result and gave
             * back the URB.
             */
            uinfo("the urb (seqnum %d) was already given backed\n",
                                          pdu->base.seqnum);
      } else {
            dbg_vhci_rx("now giveback urb %p\n", urb);

            /* If unlink is succeed, status is -ECONNRESET */
            urb->status = pdu->u.ret_unlink.status;
            uinfo("%d\n", urb->status);

            spin_lock(&the_controller->lock);
            usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
            spin_unlock(&the_controller->lock);

            usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
                                                urb->status);
      }

      kfree(unlink);

      return;
}

/* recv a pdu */
static void vhci_rx_pdu(struct usbip_device *ud)
{
      int ret;
      struct usbip_header pdu;
      struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);


      dbg_vhci_rx("Enter\n");

      memset(&pdu, 0, sizeof(pdu));


      /* 1. receive a pdu header */
      ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
      if (ret != sizeof(pdu)) {
            uerr("receiving pdu failed! size is %d, should be %d\n",
                        ret, (unsigned int)sizeof(pdu));
            usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
            return;
      }

      usbip_header_correct_endian(&pdu, 0);

      if (dbg_flag_vhci_rx)
            usbip_dump_header(&pdu);

      switch (pdu.base.command) {
      case USBIP_RET_SUBMIT:
            vhci_recv_ret_submit(vdev, &pdu);
            break;
      case USBIP_RET_UNLINK:
            vhci_recv_ret_unlink(vdev, &pdu);
            break;
      default:
            /* NOTREACHED */
            uerr("unknown pdu %u\n", pdu.base.command);
            usbip_dump_header(&pdu);
            usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
      }
}


/*-------------------------------------------------------------------------*/

void vhci_rx_loop(struct usbip_task *ut)
{
      struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);


      while (1) {
            if (signal_pending(current)) {
                  dbg_vhci_rx("signal catched!\n");
                  break;
            }


            if (usbip_event_happend(ud))
                  break;

            vhci_rx_pdu(ud);
      }
}


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