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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - drivers/usb/usbip/vhci_rx.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2003-2008 Takahiro Hirofuchi
6 #include <linux/kthread.h>
7 #include <linux/slab.h>
9 #include "usbip_common.h"
12 /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */
13 struct urb
*pickup_urb_and_free_priv(struct vhci_device
*vdev
, __u32 seqnum
)
15 struct vhci_priv
*priv
, *tmp
;
16 struct urb
*urb
= NULL
;
19 list_for_each_entry_safe(priv
, tmp
, &vdev
->priv_rx
, list
) {
20 if (priv
->seqnum
!= seqnum
)
26 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
33 dev_info(&urb
->dev
->dev
,
34 "urb %p was unlinked %ssynchronuously.\n", urb
,
35 status
== -ENOENT
? "" : "a");
41 dev_info(&urb
->dev
->dev
,
42 "urb %p may be in a error, status %d\n", urb
,
46 list_del(&priv
->list
);
56 static void vhci_recv_ret_submit(struct vhci_device
*vdev
,
57 struct usbip_header
*pdu
)
59 struct vhci_hcd
*vhci_hcd
= vdev_to_vhci_hcd(vdev
);
60 struct vhci
*vhci
= vhci_hcd
->vhci
;
61 struct usbip_device
*ud
= &vdev
->ud
;
65 spin_lock_irqsave(&vdev
->priv_lock
, flags
);
66 urb
= pickup_urb_and_free_priv(vdev
, pdu
->base
.seqnum
);
67 spin_unlock_irqrestore(&vdev
->priv_lock
, flags
);
70 pr_err("cannot find a urb of seqnum %u\n", pdu
->base
.seqnum
);
71 pr_info("max seqnum %d\n",
72 atomic_read(&vhci_hcd
->seqnum
));
73 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
77 /* unpack the pdu to a urb */
78 usbip_pack_pdu(pdu
, urb
, USBIP_RET_SUBMIT
, 0);
80 /* recv transfer buffer */
81 if (usbip_recv_xbuff(ud
, urb
) < 0)
84 /* recv iso_packet_descriptor */
85 if (usbip_recv_iso(ud
, urb
) < 0)
88 /* restore the padding in iso packets */
89 usbip_pad_iso(ud
, urb
);
91 if (usbip_dbg_flag_vhci_rx
)
94 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
96 spin_lock_irqsave(&vhci
->lock
, flags
);
97 usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd
), urb
);
98 spin_unlock_irqrestore(&vhci
->lock
, flags
);
100 usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd
), urb
, urb
->status
);
102 usbip_dbg_vhci_rx("Leave\n");
105 static struct vhci_unlink
*dequeue_pending_unlink(struct vhci_device
*vdev
,
106 struct usbip_header
*pdu
)
108 struct vhci_unlink
*unlink
, *tmp
;
111 spin_lock_irqsave(&vdev
->priv_lock
, flags
);
113 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
114 pr_info("unlink->seqnum %lu\n", unlink
->seqnum
);
115 if (unlink
->seqnum
== pdu
->base
.seqnum
) {
116 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
118 list_del(&unlink
->list
);
120 spin_unlock_irqrestore(&vdev
->priv_lock
, flags
);
125 spin_unlock_irqrestore(&vdev
->priv_lock
, flags
);
130 static void vhci_recv_ret_unlink(struct vhci_device
*vdev
,
131 struct usbip_header
*pdu
)
133 struct vhci_hcd
*vhci_hcd
= vdev_to_vhci_hcd(vdev
);
134 struct vhci
*vhci
= vhci_hcd
->vhci
;
135 struct vhci_unlink
*unlink
;
139 usbip_dump_header(pdu
);
141 unlink
= dequeue_pending_unlink(vdev
, pdu
);
143 pr_info("cannot find the pending unlink %u\n",
148 spin_lock_irqsave(&vdev
->priv_lock
, flags
);
149 urb
= pickup_urb_and_free_priv(vdev
, unlink
->unlink_seqnum
);
150 spin_unlock_irqrestore(&vdev
->priv_lock
, flags
);
154 * I get the result of a unlink request. But, it seems that I
155 * already received the result of its submit result and gave
158 pr_info("the urb (seqnum %d) was already given back\n",
161 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
163 /* If unlink is successful, status is -ECONNRESET */
164 urb
->status
= pdu
->u
.ret_unlink
.status
;
165 pr_info("urb->status %d\n", urb
->status
);
167 spin_lock_irqsave(&vhci
->lock
, flags
);
168 usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd
), urb
);
169 spin_unlock_irqrestore(&vhci
->lock
, flags
);
171 usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd
), urb
, urb
->status
);
177 static int vhci_priv_tx_empty(struct vhci_device
*vdev
)
182 spin_lock_irqsave(&vdev
->priv_lock
, flags
);
183 empty
= list_empty(&vdev
->priv_rx
);
184 spin_unlock_irqrestore(&vdev
->priv_lock
, flags
);
190 static void vhci_rx_pdu(struct usbip_device
*ud
)
193 struct usbip_header pdu
;
194 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
196 usbip_dbg_vhci_rx("Enter\n");
198 memset(&pdu
, 0, sizeof(pdu
));
200 /* receive a pdu header */
201 ret
= usbip_recv(ud
->tcp_socket
, &pdu
, sizeof(pdu
));
203 if (ret
== -ECONNRESET
)
204 pr_info("connection reset by peer\n");
205 else if (ret
== -EAGAIN
) {
206 /* ignore if connection was idle */
207 if (vhci_priv_tx_empty(vdev
))
209 pr_info("connection timed out with pending urbs\n");
210 } else if (ret
!= -ERESTARTSYS
)
211 pr_info("xmit failed %d\n", ret
);
213 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
217 pr_info("connection closed");
218 usbip_event_add(ud
, VDEV_EVENT_DOWN
);
221 if (ret
!= sizeof(pdu
)) {
222 pr_err("received pdu size is %d, should be %d\n", ret
,
223 (unsigned int)sizeof(pdu
));
224 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
228 usbip_header_correct_endian(&pdu
, 0);
230 if (usbip_dbg_flag_vhci_rx
)
231 usbip_dump_header(&pdu
);
233 switch (pdu
.base
.command
) {
234 case USBIP_RET_SUBMIT
:
235 vhci_recv_ret_submit(vdev
, &pdu
);
237 case USBIP_RET_UNLINK
:
238 vhci_recv_ret_unlink(vdev
, &pdu
);
242 pr_err("unknown pdu %u\n", pdu
.base
.command
);
243 usbip_dump_header(&pdu
);
244 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
249 int vhci_rx_loop(void *data
)
251 struct usbip_device
*ud
= data
;
253 while (!kthread_should_stop()) {
254 if (usbip_event_happened(ud
))