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 %p vurb %p seqnum %u\n",
47 dev_info(&urb->dev->dev,
48 "urb %p was unlinked %ssynchronuously.\n", urb,
49 status == -ENOENT ? "" : "a");
55 dev_info(&urb->dev->dev,
56 "urb %p may be in a error, status %d\n", urb,
60 list_del(&priv->list);
70 static void vhci_recv_ret_submit(struct vhci_device *vdev,
71 struct usbip_header *pdu)
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\n", pdu->base.seqnum);
83 pr_info("max seqnum %d\n",
84 atomic_read(&the_controller->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)
96 /* recv iso_packet_descriptor */
97 if (usbip_recv_iso(ud, urb) < 0)
100 /* restore the padding in iso packets */
101 usbip_pad_iso(ud, urb);
103 if (usbip_dbg_flag_vhci_rx)
106 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
108 spin_lock_irqsave(&the_controller->lock, flags);
109 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
110 spin_unlock_irqrestore(&the_controller->lock, flags);
112 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
114 usbip_dbg_vhci_rx("Leave\n");
117 static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
118 struct usbip_header *pdu)
120 struct vhci_unlink *unlink, *tmp;
123 spin_lock_irqsave(&vdev->priv_lock, flags);
125 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
126 pr_info("unlink->seqnum %lu\n", unlink->seqnum);
127 if (unlink->seqnum == pdu->base.seqnum) {
128 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
130 list_del(&unlink->list);
132 spin_unlock_irqrestore(&vdev->priv_lock, flags);
137 spin_unlock_irqrestore(&vdev->priv_lock, flags);
142 static void vhci_recv_ret_unlink(struct vhci_device *vdev,
143 struct usbip_header *pdu)
145 struct vhci_unlink *unlink;
149 usbip_dump_header(pdu);
151 unlink = dequeue_pending_unlink(vdev, pdu);
153 pr_info("cannot find the pending unlink %u\n",
158 spin_lock_irqsave(&vdev->priv_lock, flags);
159 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
160 spin_unlock_irqrestore(&vdev->priv_lock, flags);
164 * I get the result of a unlink request. But, it seems that I
165 * already received the result of its submit result and gave
168 pr_info("the urb (seqnum %d) was already given back\n",
171 usbip_dbg_vhci_rx("now giveback urb %p\n", urb);
173 /* If unlink is successful, status is -ECONNRESET */
174 urb->status = pdu->u.ret_unlink.status;
175 pr_info("urb->status %d\n", urb->status);
177 spin_lock_irqsave(&the_controller->lock, flags);
178 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
179 spin_unlock_irqrestore(&the_controller->lock, flags);
181 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
188 static int vhci_priv_tx_empty(struct vhci_device *vdev)
193 spin_lock_irqsave(&vdev->priv_lock, flags);
194 empty = list_empty(&vdev->priv_rx);
195 spin_unlock_irqrestore(&vdev->priv_lock, flags);
201 static void vhci_rx_pdu(struct usbip_device *ud)
204 struct usbip_header pdu;
205 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
207 usbip_dbg_vhci_rx("Enter\n");
209 memset(&pdu, 0, sizeof(pdu));
211 /* receive a pdu header */
212 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
214 if (ret == -ECONNRESET)
215 pr_info("connection reset by peer\n");
216 else if (ret == -EAGAIN) {
217 /* ignore if connection was idle */
218 if (vhci_priv_tx_empty(vdev))
220 pr_info("connection timed out with pending urbs\n");
221 } else if (ret != -ERESTARTSYS)
222 pr_info("xmit failed %d\n", ret);
224 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
228 pr_info("connection closed");
229 usbip_event_add(ud, VDEV_EVENT_DOWN);
232 if (ret != sizeof(pdu)) {
233 pr_err("received pdu size is %d, should be %d\n", ret,
234 (unsigned int)sizeof(pdu));
235 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
239 usbip_header_correct_endian(&pdu, 0);
241 if (usbip_dbg_flag_vhci_rx)
242 usbip_dump_header(&pdu);
244 switch (pdu.base.command) {
245 case USBIP_RET_SUBMIT:
246 vhci_recv_ret_submit(vdev, &pdu);
248 case USBIP_RET_UNLINK:
249 vhci_recv_ret_unlink(vdev, &pdu);
253 pr_err("unknown pdu %u\n", pdu.base.command);
254 usbip_dump_header(&pdu);
255 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
260 int vhci_rx_loop(void *data)
262 struct usbip_device *ud = data;
264 while (!kthread_should_stop()) {
265 if (usbip_event_happened(ud))