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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/staging/usbip/vhci_rx.c
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
;
76 spin_lock(&vdev
->priv_lock
);
77 urb
= pickup_urb_and_free_priv(vdev
, pdu
->base
.seqnum
);
78 spin_unlock(&vdev
->priv_lock
);
81 pr_err("cannot find a urb of seqnum %u\n", pdu
->base
.seqnum
);
82 pr_info("max seqnum %d\n",
83 atomic_read(&the_controller
->seqnum
));
84 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
88 /* unpack the pdu to a urb */
89 usbip_pack_pdu(pdu
, urb
, USBIP_RET_SUBMIT
, 0);
91 /* recv transfer buffer */
92 if (usbip_recv_xbuff(ud
, urb
) < 0)
95 /* recv iso_packet_descriptor */
96 if (usbip_recv_iso(ud
, urb
) < 0)
99 /* restore the padding in iso packets */
100 usbip_pad_iso(ud
, urb
);
102 if (usbip_dbg_flag_vhci_rx
)
105 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
107 spin_lock(&the_controller
->lock
);
108 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
109 spin_unlock(&the_controller
->lock
);
111 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
113 usbip_dbg_vhci_rx("Leave\n");
118 static struct vhci_unlink
*dequeue_pending_unlink(struct vhci_device
*vdev
,
119 struct usbip_header
*pdu
)
121 struct vhci_unlink
*unlink
, *tmp
;
123 spin_lock(&vdev
->priv_lock
);
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(&vdev
->priv_lock
);
137 spin_unlock(&vdev
->priv_lock
);
142 static void vhci_recv_ret_unlink(struct vhci_device
*vdev
,
143 struct usbip_header
*pdu
)
145 struct vhci_unlink
*unlink
;
148 usbip_dump_header(pdu
);
150 unlink
= dequeue_pending_unlink(vdev
, pdu
);
152 pr_info("cannot find the pending unlink %u\n",
157 spin_lock(&vdev
->priv_lock
);
158 urb
= pickup_urb_and_free_priv(vdev
, unlink
->unlink_seqnum
);
159 spin_unlock(&vdev
->priv_lock
);
163 * I get the result of a unlink request. But, it seems that I
164 * already received the result of its submit result and gave
167 pr_info("the urb (seqnum %d) was already given back\n",
170 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
172 /* If unlink is successful, status is -ECONNRESET */
173 urb
->status
= pdu
->u
.ret_unlink
.status
;
174 pr_info("urb->status %d\n", urb
->status
);
176 spin_lock(&the_controller
->lock
);
177 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
178 spin_unlock(&the_controller
->lock
);
180 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 /* receive a pdu header */
210 ret
= usbip_recv(ud
->tcp_socket
, &pdu
, sizeof(pdu
));
212 if (ret
== -ECONNRESET
)
213 pr_info("connection reset by peer\n");
214 else if (ret
== -EAGAIN
) {
215 /* ignore if connection was idle */
216 if (vhci_priv_tx_empty(vdev
))
218 pr_info("connection timed out with pending urbs\n");
219 } else if (ret
!= -ERESTARTSYS
)
220 pr_info("xmit failed %d\n", ret
);
222 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
226 pr_info("connection closed");
227 usbip_event_add(ud
, VDEV_EVENT_DOWN
);
230 if (ret
!= sizeof(pdu
)) {
231 pr_err("received pdu size is %d, should be %d\n", ret
,
232 (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 pr_err("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
))