| /* |
| * 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 <linux/slab.h> |
| |
| #include "usbip_common.h" |
| #include "vhci.h" |
| |
| |
| /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */ |
| struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, |
| __u32 seqnum) |
| { |
| struct vhci_priv *priv, *tmp; |
| struct urb *urb = NULL; |
| int status; |
| |
| list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { |
| if (priv->seqnum == seqnum) { |
| urb = priv->urb; |
| status = urb->status; |
| |
| usbip_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; |
| } |
| } |
| |
| 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; |
| |
| spin_lock(&vdev->priv_lock); |
| |
| urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); |
| |
| spin_unlock(&vdev->priv_lock); |
| |
| if (!urb) { |
| usbip_uerr("cannot find a urb of seqnum %u\n", |
| pdu->base.seqnum); |
| usbip_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 (usbip_dbg_flag_vhci_rx) |
| usbip_dump_urb(urb); |
| |
| |
| usbip_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); |
| |
| |
| usbip_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) { |
| usbip_uinfo("unlink->seqnum %lu\n", unlink->seqnum); |
| if (unlink->seqnum == pdu->base.seqnum) { |
| usbip_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) { |
| usbip_uinfo("cannot find the pending unlink %u\n", |
| pdu->base.seqnum); |
| return; |
| } |
| |
| spin_lock(&vdev->priv_lock); |
| |
| urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); |
| |
| spin_unlock(&vdev->priv_lock); |
| |
| 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. |
| */ |
| usbip_uinfo("the urb (seqnum %d) was already given backed\n", |
| pdu->base.seqnum); |
| } else { |
| usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
| |
| /* If unlink is succeed, status is -ECONNRESET */ |
| urb->status = pdu->u.ret_unlink.status; |
| usbip_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); |
| |
| |
| usbip_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)) { |
| usbip_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 (usbip_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 */ |
| usbip_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)) { |
| usbip_dbg_vhci_rx("signal catched!\n"); |
| break; |
| } |
| |
| |
| if (usbip_event_happened(ud)) |
| break; |
| |
| vhci_rx_pdu(ud); |
| } |
| } |
| |