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. caller must hold vdev->priv_lock */
27 struct urb
*pickup_urb_and_free_priv(struct vhci_device
*vdev
,
30 struct vhci_priv
*priv
, *tmp
;
31 struct urb
*urb
= NULL
;
34 list_for_each_entry_safe(priv
, tmp
, &vdev
->priv_rx
, list
) {
35 if (priv
->seqnum
== seqnum
) {
39 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
42 /* TODO: fix logic here to improve indent situtation */
43 if (status
!= -EINPROGRESS
) {
44 if (status
== -ENOENT
||
45 status
== -ECONNRESET
)
46 dev_info(&urb
->dev
->dev
,
47 "urb %p was unlinked "
48 "%ssynchronuously.\n", urb
,
49 status
== -ENOENT
? "" : "a");
51 dev_info(&urb
->dev
->dev
,
52 "urb %p may be in a error, "
53 "status %d\n", urb
, status
);
56 list_del(&priv
->list
);
67 static void vhci_recv_ret_submit(struct vhci_device
*vdev
,
68 struct usbip_header
*pdu
)
70 struct usbip_device
*ud
= &vdev
->ud
;
73 spin_lock(&vdev
->priv_lock
);
75 urb
= pickup_urb_and_free_priv(vdev
, pdu
->base
.seqnum
);
77 spin_unlock(&vdev
->priv_lock
);
80 usbip_uerr("cannot find a urb of seqnum %u\n",
82 usbip_uinfo("max seqnum %d\n",
83 atomic_read(&the_controller
->seqnum
));
84 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);
93 /* recv transfer buffer */
94 if (usbip_recv_xbuff(ud
, urb
) < 0)
98 /* recv iso_packet_descriptor */
99 if (usbip_recv_iso(ud
, urb
) < 0)
103 if (usbip_dbg_flag_vhci_rx
)
107 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
109 spin_lock(&the_controller
->lock
);
110 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
111 spin_unlock(&the_controller
->lock
);
113 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
116 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
;
127 spin_lock(&vdev
->priv_lock
);
129 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
130 usbip_uinfo("unlink->seqnum %lu\n", unlink
->seqnum
);
131 if (unlink
->seqnum
== pdu
->base
.seqnum
) {
132 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
134 list_del(&unlink
->list
);
136 spin_unlock(&vdev
->priv_lock
);
141 spin_unlock(&vdev
->priv_lock
);
147 static void vhci_recv_ret_unlink(struct vhci_device
*vdev
,
148 struct usbip_header
*pdu
)
150 struct vhci_unlink
*unlink
;
153 usbip_dump_header(pdu
);
155 unlink
= dequeue_pending_unlink(vdev
, pdu
);
157 usbip_uinfo("cannot find the pending unlink %u\n",
162 spin_lock(&vdev
->priv_lock
);
164 urb
= pickup_urb_and_free_priv(vdev
, unlink
->unlink_seqnum
);
166 spin_unlock(&vdev
->priv_lock
);
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 usbip_uinfo("the urb (seqnum %d) was already given backed\n",
177 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
179 /* If unlink is succeed, status is -ECONNRESET */
180 urb
->status
= pdu
->u
.ret_unlink
.status
;
181 usbip_uinfo("%d\n", urb
->status
);
183 spin_lock(&the_controller
->lock
);
184 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
185 spin_unlock(&the_controller
->lock
);
187 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
196 static int vhci_priv_tx_empty(struct vhci_device
*vdev
)
200 spin_lock(&vdev
->priv_lock
);
202 empty
= list_empty(&vdev
->priv_rx
);
204 spin_unlock(&vdev
->priv_lock
);
210 static void vhci_rx_pdu(struct usbip_device
*ud
)
213 struct usbip_header pdu
;
214 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
217 usbip_dbg_vhci_rx("Enter\n");
219 memset(&pdu
, 0, sizeof(pdu
));
221 /* 1. receive a pdu header */
222 ret
= usbip_xmit(0, ud
->tcp_socket
, (char *) &pdu
, sizeof(pdu
), 0);
224 if (ret
== -ECONNRESET
)
225 usbip_uinfo("connection reset by peer\n");
226 else if (ret
== -EAGAIN
) {
227 /* ignore if connection was idle */
228 if (vhci_priv_tx_empty(vdev
))
230 usbip_uinfo("connection timed out with pending urbs\n");
231 } else if (ret
!= -ERESTARTSYS
)
232 usbip_uinfo("xmit failed %d\n", ret
);
234 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
238 usbip_uinfo("connection closed");
239 usbip_event_add(ud
, VDEV_EVENT_DOWN
);
242 if (ret
!= sizeof(pdu
)) {
243 usbip_uerr("received pdu size is %d, should be %d\n",
244 ret
, (unsigned int)sizeof(pdu
));
245 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
249 usbip_header_correct_endian(&pdu
, 0);
251 if (usbip_dbg_flag_vhci_rx
)
252 usbip_dump_header(&pdu
);
254 switch (pdu
.base
.command
) {
255 case USBIP_RET_SUBMIT
:
256 vhci_recv_ret_submit(vdev
, &pdu
);
258 case USBIP_RET_UNLINK
:
259 vhci_recv_ret_unlink(vdev
, &pdu
);
263 usbip_uerr("unknown pdu %u\n", pdu
.base
.command
);
264 usbip_dump_header(&pdu
);
265 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
270 /*-------------------------------------------------------------------------*/
272 void vhci_rx_loop(struct usbip_task
*ut
)
274 struct usbip_device
*ud
= container_of(ut
, struct usbip_device
, tcp_rx
);
278 if (signal_pending(current
)) {
279 usbip_dbg_vhci_rx("signal catched!\n");
284 if (usbip_event_happened(ud
))