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) {
38 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
41 /* TODO: fix logic here to improve indent situtation */
42 if (status != -EINPROGRESS) {
43 if (status == -ENOENT ||
44 status == -ECONNRESET)
45 dev_info(&urb->dev->dev,
46 "urb %p was unlinked "
47 "%ssynchronuously.\n", urb,
48 status == -ENOENT ? "" : "a");
50 dev_info(&urb->dev->dev,
51 "urb %p may be in a error, "
52 "status %d\n", urb, status);
55 list_del(&priv->list);
66 static void vhci_recv_ret_submit(struct vhci_device *vdev,
67 struct usbip_header *pdu)
69 struct usbip_device *ud = &vdev->ud;
72 spin_lock(&vdev->priv_lock);
73 urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
74 spin_unlock(&vdev->priv_lock);
77 pr_err("cannot find a urb of seqnum %u\n", pdu->base.seqnum);
78 pr_info("max seqnum %d\n",
79 atomic_read(&the_controller->seqnum));
80 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
84 /* unpack the pdu to a urb */
85 usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);
87 /* recv transfer buffer */
88 if (usbip_recv_xbuff(ud, urb) < 0)
91 /* recv iso_packet_descriptor */
92 if (usbip_recv_iso(ud, urb) < 0)
95 /* restore the padding in iso packets */
96 usbip_pad_iso(ud, urb);
98 if (usbip_dbg_flag_vhci_rx)
101 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
103 spin_lock(&the_controller->lock);
104 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
105 spin_unlock(&the_controller->lock);
107 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
109 usbip_dbg_vhci_rx("Leave\n");
114 static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
115 struct usbip_header *pdu)
117 struct vhci_unlink *unlink, *tmp;
119 spin_lock(&vdev->priv_lock);
121 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
122 pr_info("unlink->seqnum %lu\n", unlink->seqnum);
123 if (unlink->seqnum == pdu->base.seqnum) {
124 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
126 list_del(&unlink->list);
128 spin_unlock(&vdev->priv_lock);
133 spin_unlock(&vdev->priv_lock);
138 static void vhci_recv_ret_unlink(struct vhci_device *vdev,
139 struct usbip_header *pdu)
141 struct vhci_unlink *unlink;
144 usbip_dump_header(pdu);
146 unlink = dequeue_pending_unlink(vdev, pdu);
148 pr_info("cannot find the pending unlink %u\n",
153 spin_lock(&vdev->priv_lock);
154 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
155 spin_unlock(&vdev->priv_lock);
159 * I get the result of a unlink request. But, it seems that I
160 * already received the result of its submit result and gave
163 pr_info("the urb (seqnum %d) was already given back\n",
166 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
168 /* If unlink is successful, status is -ECONNRESET */
169 urb->status = pdu->u.ret_unlink.status;
170 pr_info("urb->status %d\n", urb->status);
172 spin_lock(&the_controller->lock);
173 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
174 spin_unlock(&the_controller->lock);
176 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
183 static int vhci_priv_tx_empty(struct vhci_device *vdev)
187 spin_lock(&vdev->priv_lock);
188 empty = list_empty(&vdev->priv_rx);
189 spin_unlock(&vdev->priv_lock);
195 static void vhci_rx_pdu(struct usbip_device *ud)
198 struct usbip_header pdu;
199 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
201 usbip_dbg_vhci_rx("Enter\n");
203 memset(&pdu, 0, sizeof(pdu));
205 /* 1. receive a pdu header */
206 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
208 if (ret == -ECONNRESET)
209 pr_info("connection reset by peer\n");
210 else if (ret == -EAGAIN) {
211 /* ignore if connection was idle */
212 if (vhci_priv_tx_empty(vdev))
214 pr_info("connection timed out with pending urbs\n");
215 } else if (ret != -ERESTARTSYS)
216 pr_info("xmit failed %d\n", ret);
218 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
222 pr_info("connection closed");
223 usbip_event_add(ud, VDEV_EVENT_DOWN);
226 if (ret != sizeof(pdu)) {
227 pr_err("received pdu size is %d, should be %d\n", ret,
228 (unsigned int)sizeof(pdu));
229 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
233 usbip_header_correct_endian(&pdu, 0);
235 if (usbip_dbg_flag_vhci_rx)
236 usbip_dump_header(&pdu);
238 switch (pdu.base.command) {
239 case USBIP_RET_SUBMIT:
240 vhci_recv_ret_submit(vdev, &pdu);
242 case USBIP_RET_UNLINK:
243 vhci_recv_ret_unlink(vdev, &pdu);
247 pr_err("unknown pdu %u\n", pdu.base.command);
248 usbip_dump_header(&pdu);
249 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
254 int vhci_rx_loop(void *data)
256 struct usbip_device *ud = data;
258 while (!kthread_should_stop()) {
259 if (usbip_event_happened(ud))