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/kthread.h>
21 #include <linux/slab.h>
23 #include "usbip_common.h"
26 /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */
27 struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum)
29 struct vhci_priv *priv, *tmp;
30 struct urb *urb = NULL;
33 list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) {
34 if (priv->seqnum != seqnum)
40 usbip_dbg_vhci_rx("find urb seqnum %u\n", seqnum);
46 dev_dbg(&urb->dev->dev,
47 "urb seq# %u was unlinked %ssynchronuously\n",
48 seqnum, status == -ENOENT ? "" : "a");
54 dev_dbg(&urb->dev->dev,
55 "urb seq# %u may be in a error, status %d\n",
59 list_del(&priv->list);
69 static void vhci_recv_ret_submit(struct vhci_device *vdev,
70 struct usbip_header *pdu)
72 struct vhci_hcd *vhci = vdev_to_vhci(vdev);
73 struct usbip_device *ud = &vdev->ud;
77 spin_lock_irqsave(&vdev->priv_lock, flags);
78 urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
79 spin_unlock_irqrestore(&vdev->priv_lock, flags);
82 pr_err("cannot find a urb of seqnum %u max seqnum %d\n",
84 atomic_read(&vhci->seqnum));
85 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
89 /* unpack the pdu to a urb */
90 usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);
92 /* recv transfer buffer */
93 if (usbip_recv_xbuff(ud, urb) < 0) {
94 urb->status = -EPROTO;
98 /* recv iso_packet_descriptor */
99 if (usbip_recv_iso(ud, urb) < 0) {
100 urb->status = -EPROTO;
104 /* restore the padding in iso packets */
105 usbip_pad_iso(ud, urb);
108 if (usbip_dbg_flag_vhci_rx)
111 usbip_dbg_vhci_rx("now giveback urb %u\n", pdu->base.seqnum);
113 spin_lock_irqsave(&vhci->lock, flags);
114 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb);
115 spin_unlock_irqrestore(&vhci->lock, flags);
117 usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
119 usbip_dbg_vhci_rx("Leave\n");
122 static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
123 struct usbip_header *pdu)
125 struct vhci_unlink *unlink, *tmp;
128 spin_lock_irqsave(&vdev->priv_lock, flags);
130 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
131 pr_info("unlink->seqnum %lu\n", unlink->seqnum);
132 if (unlink->seqnum == pdu->base.seqnum) {
133 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
135 list_del(&unlink->list);
137 spin_unlock_irqrestore(&vdev->priv_lock, flags);
142 spin_unlock_irqrestore(&vdev->priv_lock, flags);
147 static void vhci_recv_ret_unlink(struct vhci_device *vdev,
148 struct usbip_header *pdu)
150 struct vhci_hcd *vhci = vdev_to_vhci(vdev);
151 struct vhci_unlink *unlink;
155 usbip_dump_header(pdu);
157 unlink = dequeue_pending_unlink(vdev, pdu);
159 pr_info("cannot find the pending unlink %u\n",
164 spin_lock_irqsave(&vdev->priv_lock, flags);
165 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
166 spin_unlock_irqrestore(&vdev->priv_lock, flags);
170 * I get the result of a unlink request. But, it seems that I
171 * already received the result of its submit result and gave
174 pr_info("the urb (seqnum %d) was already given back\n",
177 usbip_dbg_vhci_rx("now giveback urb %d\n", pdu->base.seqnum);
179 /* If unlink is successful, status is -ECONNRESET */
180 urb->status = pdu->u.ret_unlink.status;
181 pr_info("urb->status %d\n", urb->status);
183 spin_lock_irqsave(&vhci->lock, flags);
184 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb);
185 spin_unlock_irqrestore(&vhci->lock, flags);
187 usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
193 static int vhci_priv_tx_empty(struct vhci_device *vdev)
198 spin_lock_irqsave(&vdev->priv_lock, flags);
199 empty = list_empty(&vdev->priv_rx);
200 spin_unlock_irqrestore(&vdev->priv_lock, flags);
206 static void vhci_rx_pdu(struct usbip_device *ud)
209 struct usbip_header pdu;
210 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
212 usbip_dbg_vhci_rx("Enter\n");
214 memset(&pdu, 0, sizeof(pdu));
216 /* receive a pdu header */
217 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
219 if (ret == -ECONNRESET)
220 pr_info("connection reset by peer\n");
221 else if (ret == -EAGAIN) {
222 /* ignore if connection was idle */
223 if (vhci_priv_tx_empty(vdev))
225 pr_info("connection timed out with pending urbs\n");
226 } else if (ret != -ERESTARTSYS)
227 pr_info("xmit failed %d\n", ret);
229 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
233 pr_info("connection closed");
234 usbip_event_add(ud, VDEV_EVENT_DOWN);
237 if (ret != sizeof(pdu)) {
238 pr_err("received pdu size is %d, should be %d\n", ret,
239 (unsigned int)sizeof(pdu));
240 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
244 usbip_header_correct_endian(&pdu, 0);
246 if (usbip_dbg_flag_vhci_rx)
247 usbip_dump_header(&pdu);
249 switch (pdu.base.command) {
250 case USBIP_RET_SUBMIT:
251 vhci_recv_ret_submit(vdev, &pdu);
253 case USBIP_RET_UNLINK:
254 vhci_recv_ret_unlink(vdev, &pdu);
258 pr_err("unknown pdu %u\n", pdu.base.command);
259 usbip_dump_header(&pdu);
260 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
265 int vhci_rx_loop(void *data)
267 struct usbip_device *ud = data;
269 while (!kthread_should_stop()) {
270 if (usbip_event_happened(ud))