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 usbip_uerr("cannot find a urb of seqnum %u\n",
79 usbip_uinfo("max seqnum %d\n",
80 atomic_read(&the_controller
->seqnum
));
81 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
85 /* unpack the pdu to a urb */
86 usbip_pack_pdu(pdu
, urb
, USBIP_RET_SUBMIT
, 0);
88 /* recv transfer buffer */
89 if (usbip_recv_xbuff(ud
, urb
) < 0)
92 /* recv iso_packet_descriptor */
93 if (usbip_recv_iso(ud
, urb
) < 0)
96 /* restore the padding in iso packets */
97 if (usbip_pad_iso(ud
, urb
) < 0)
100 if (usbip_dbg_flag_vhci_rx
)
103 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
105 spin_lock(&the_controller
->lock
);
106 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
107 spin_unlock(&the_controller
->lock
);
109 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
111 usbip_dbg_vhci_rx("Leave\n");
116 static struct vhci_unlink
*dequeue_pending_unlink(struct vhci_device
*vdev
,
117 struct usbip_header
*pdu
)
119 struct vhci_unlink
*unlink
, *tmp
;
121 spin_lock(&vdev
->priv_lock
);
123 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
124 usbip_uinfo("unlink->seqnum %lu\n", unlink
->seqnum
);
125 if (unlink
->seqnum
== pdu
->base
.seqnum
) {
126 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
128 list_del(&unlink
->list
);
130 spin_unlock(&vdev
->priv_lock
);
135 spin_unlock(&vdev
->priv_lock
);
140 static void vhci_recv_ret_unlink(struct vhci_device
*vdev
,
141 struct usbip_header
*pdu
)
143 struct vhci_unlink
*unlink
;
146 usbip_dump_header(pdu
);
148 unlink
= dequeue_pending_unlink(vdev
, pdu
);
150 usbip_uinfo("cannot find the pending unlink %u\n",
155 spin_lock(&vdev
->priv_lock
);
156 urb
= pickup_urb_and_free_priv(vdev
, unlink
->unlink_seqnum
);
157 spin_unlock(&vdev
->priv_lock
);
161 * I get the result of a unlink request. But, it seems that I
162 * already received the result of its submit result and gave
165 usbip_uinfo("the urb (seqnum %d) was already given backed\n",
168 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
170 /* If unlink is succeed, status is -ECONNRESET */
171 urb
->status
= pdu
->u
.ret_unlink
.status
;
172 usbip_uinfo("%d\n", urb
->status
);
174 spin_lock(&the_controller
->lock
);
175 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
176 spin_unlock(&the_controller
->lock
);
178 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
187 static int vhci_priv_tx_empty(struct vhci_device
*vdev
)
191 spin_lock(&vdev
->priv_lock
);
192 empty
= list_empty(&vdev
->priv_rx
);
193 spin_unlock(&vdev
->priv_lock
);
199 static void vhci_rx_pdu(struct usbip_device
*ud
)
202 struct usbip_header pdu
;
203 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
205 usbip_dbg_vhci_rx("Enter\n");
207 memset(&pdu
, 0, sizeof(pdu
));
209 /* 1. receive a pdu header */
210 ret
= usbip_xmit(0, ud
->tcp_socket
, (char *) &pdu
, sizeof(pdu
), 0);
212 if (ret
== -ECONNRESET
)
213 usbip_uinfo("connection reset by peer\n");
214 else if (ret
== -EAGAIN
) {
215 /* ignore if connection was idle */
216 if (vhci_priv_tx_empty(vdev
))
218 usbip_uinfo("connection timed out with pending urbs\n");
219 } else if (ret
!= -ERESTARTSYS
)
220 usbip_uinfo("xmit failed %d\n", ret
);
222 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
226 usbip_uinfo("connection closed");
227 usbip_event_add(ud
, VDEV_EVENT_DOWN
);
230 if (ret
!= sizeof(pdu
)) {
231 usbip_uerr("received pdu size is %d, should be %d\n",
232 ret
, (unsigned int)sizeof(pdu
));
233 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
237 usbip_header_correct_endian(&pdu
, 0);
239 if (usbip_dbg_flag_vhci_rx
)
240 usbip_dump_header(&pdu
);
242 switch (pdu
.base
.command
) {
243 case USBIP_RET_SUBMIT
:
244 vhci_recv_ret_submit(vdev
, &pdu
);
246 case USBIP_RET_UNLINK
:
247 vhci_recv_ret_unlink(vdev
, &pdu
);
251 usbip_uerr("unknown pdu %u\n", pdu
.base
.command
);
252 usbip_dump_header(&pdu
);
253 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
258 int vhci_rx_loop(void *data
)
260 struct usbip_device
*ud
= data
;
262 while (!kthread_should_stop()) {
263 if (usbip_event_happened(ud
))