2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
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.
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.
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,
20 #include <linux/slab.h>
22 #include "usbip_common.h"
26 /* get URB from transmitted urb queue */
27 static struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev,
30 struct vhci_priv *priv, *tmp;
31 struct urb *urb = NULL;
34 spin_lock(&vdev->priv_lock);
36 list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
37 if (priv->seqnum == seqnum) {
41 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
44 /* TODO: fix logic here to improve indent situtation */
45 if (status != -EINPROGRESS) {
46 if (status == -ENOENT ||
47 status == -ECONNRESET)
48 dev_info(&urb->dev->dev,
49 "urb %p was unlinked "
50 "%ssynchronuously.\n", urb,
51 status == -ENOENT ? "" : "a");
53 dev_info(&urb->dev->dev,
54 "urb %p may be in a error, "
55 "status %d\n", urb, status);
58 list_del(&priv->list);
66 spin_unlock(&vdev->priv_lock);
71 static void vhci_recv_ret_submit(struct vhci_device *vdev,
72 struct usbip_header *pdu)
74 struct usbip_device *ud = &vdev->ud;
78 urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
82 usbip_uerr("cannot find a urb of seqnum %u\n",
84 usbip_uinfo("max seqnum %d\n",
85 atomic_read(&the_controller->seqnum));
86 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
91 /* unpack the pdu to a urb */
92 usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);
95 /* recv transfer buffer */
96 if (usbip_recv_xbuff(ud, urb) < 0)
100 /* recv iso_packet_descriptor */
101 if (usbip_recv_iso(ud, urb) < 0)
105 if (usbip_dbg_flag_vhci_rx)
109 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
111 spin_lock(&the_controller->lock);
112 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
113 spin_unlock(&the_controller->lock);
115 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
118 usbip_dbg_vhci_rx("Leave\n");
124 static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
125 struct usbip_header *pdu)
127 struct vhci_unlink *unlink, *tmp;
129 spin_lock(&vdev->priv_lock);
131 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
132 usbip_uinfo("unlink->seqnum %lu\n", unlink->seqnum);
133 if (unlink->seqnum == pdu->base.seqnum) {
134 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
136 list_del(&unlink->list);
138 spin_unlock(&vdev->priv_lock);
143 spin_unlock(&vdev->priv_lock);
149 static void vhci_recv_ret_unlink(struct vhci_device *vdev,
150 struct usbip_header *pdu)
152 struct vhci_unlink *unlink;
155 usbip_dump_header(pdu);
157 unlink = dequeue_pending_unlink(vdev, pdu);
159 usbip_uinfo("cannot find the pending unlink %u\n",
164 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
167 * I get the result of a unlink request. But, it seems that I
168 * already received the result of its submit result and gave
171 usbip_uinfo("the urb (seqnum %d) was already given backed\n",
174 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
176 /* If unlink is succeed, status is -ECONNRESET */
177 urb->status = pdu->u.ret_unlink.status;
178 usbip_uinfo("%d\n", urb->status);
180 spin_lock(&the_controller->lock);
181 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
182 spin_unlock(&the_controller->lock);
184 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
194 static void vhci_rx_pdu(struct usbip_device *ud)
197 struct usbip_header pdu;
198 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
201 usbip_dbg_vhci_rx("Enter\n");
203 memset(&pdu, 0, sizeof(pdu));
206 /* 1. receive a pdu header */
207 ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
208 if (ret != sizeof(pdu)) {
209 usbip_uerr("receiving pdu failed! size is %d, should be %d\n",
210 ret, (unsigned int)sizeof(pdu));
211 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
215 usbip_header_correct_endian(&pdu, 0);
217 if (usbip_dbg_flag_vhci_rx)
218 usbip_dump_header(&pdu);
220 switch (pdu.base.command) {
221 case USBIP_RET_SUBMIT:
222 vhci_recv_ret_submit(vdev, &pdu);
224 case USBIP_RET_UNLINK:
225 vhci_recv_ret_unlink(vdev, &pdu);
229 usbip_uerr("unknown pdu %u\n", pdu.base.command);
230 usbip_dump_header(&pdu);
231 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
236 /*-------------------------------------------------------------------------*/
238 void vhci_rx_loop(struct usbip_task *ut)
240 struct usbip_device *ud = container_of(ut, struct usbip_device, tcp_rx);
244 if (signal_pending(current)) {
245 usbip_dbg_vhci_rx("signal catched!\n");
250 if (usbip_event_happened(ud))