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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
04679b34 TH |
2 | /* |
3 | * Copyright (C) 2003-2008 Takahiro Hirofuchi | |
04679b34 TH |
4 | */ |
5 | ||
9720b4bc | 6 | #include <linux/kthread.h> |
7aaacb43 | 7 | #include <linux/slab.h> |
5a0e3ad6 | 8 | |
04679b34 TH |
9 | #include "usbip_common.h" |
10 | #include "vhci.h" | |
11 | ||
b92a5e23 | 12 | /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */ |
5ef6aceb | 13 | struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum) |
04679b34 TH |
14 | { |
15 | struct vhci_priv *priv, *tmp; | |
16 | struct urb *urb = NULL; | |
17 | int status; | |
18 | ||
04679b34 | 19 | list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { |
2663d79b SR |
20 | if (priv->seqnum != seqnum) |
21 | continue; | |
04679b34 | 22 | |
2663d79b SR |
23 | urb = priv->urb; |
24 | status = urb->status; | |
04679b34 | 25 | |
8272d099 | 26 | usbip_dbg_vhci_rx("find urb seqnum %u\n", seqnum); |
04679b34 | 27 | |
2663d79b SR |
28 | switch (status) { |
29 | case -ENOENT: | |
2da3b53c | 30 | fallthrough; |
2663d79b | 31 | case -ECONNRESET: |
8272d099 | 32 | dev_dbg(&urb->dev->dev, |
cb483264 | 33 | "urb seq# %u was unlinked %ssynchronously\n", |
8272d099 | 34 | seqnum, status == -ENOENT ? "" : "a"); |
2663d79b SR |
35 | break; |
36 | case -EINPROGRESS: | |
37 | /* no info output */ | |
04679b34 | 38 | break; |
2663d79b | 39 | default: |
8272d099 SK |
40 | dev_dbg(&urb->dev->dev, |
41 | "urb seq# %u may be in a error, status %d\n", | |
42 | seqnum, status); | |
04679b34 | 43 | } |
2663d79b SR |
44 | |
45 | list_del(&priv->list); | |
46 | kfree(priv); | |
47 | urb->hcpriv = NULL; | |
48 | ||
49 | break; | |
04679b34 TH |
50 | } |
51 | ||
04679b34 TH |
52 | return urb; |
53 | } | |
54 | ||
55 | static void vhci_recv_ret_submit(struct vhci_device *vdev, | |
5ef6aceb | 56 | struct usbip_header *pdu) |
04679b34 | 57 | { |
03cd00d5 YD |
58 | struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); |
59 | struct vhci *vhci = vhci_hcd->vhci; | |
04679b34 TH |
60 | struct usbip_device *ud = &vdev->ud; |
61 | struct urb *urb; | |
21619792 | 62 | unsigned long flags; |
04679b34 | 63 | |
21619792 | 64 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 | 65 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); |
21619792 | 66 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
67 | |
68 | if (!urb) { | |
8272d099 SK |
69 | pr_err("cannot find a urb of seqnum %u max seqnum %d\n", |
70 | pdu->base.seqnum, | |
03cd00d5 | 71 | atomic_read(&vhci_hcd->seqnum)); |
04679b34 TH |
72 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
73 | return; | |
74 | } | |
75 | ||
04679b34 TH |
76 | /* unpack the pdu to a urb */ |
77 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
78 | ||
04679b34 | 79 | /* recv transfer buffer */ |
aabb5b83 SK |
80 | if (usbip_recv_xbuff(ud, urb) < 0) { |
81 | urb->status = -EPROTO; | |
82 | goto error; | |
83 | } | |
04679b34 | 84 | |
04679b34 | 85 | /* recv iso_packet_descriptor */ |
aabb5b83 SK |
86 | if (usbip_recv_iso(ud, urb) < 0) { |
87 | urb->status = -EPROTO; | |
88 | goto error; | |
89 | } | |
04679b34 | 90 | |
28276a28 | 91 | /* restore the padding in iso packets */ |
ac2b41ac | 92 | usbip_pad_iso(ud, urb); |
04679b34 | 93 | |
aabb5b83 | 94 | error: |
b8868e45 | 95 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
96 | usbip_dump_urb(urb); |
97 | ||
ea44d190 SK |
98 | if (urb->num_sgs) |
99 | urb->transfer_flags &= ~URB_DMA_MAP_SG; | |
100 | ||
8272d099 | 101 | usbip_dbg_vhci_rx("now giveback urb %u\n", pdu->base.seqnum); |
04679b34 | 102 | |
0775a9cb | 103 | spin_lock_irqsave(&vhci->lock, flags); |
03cd00d5 | 104 | usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb); |
0775a9cb | 105 | spin_unlock_irqrestore(&vhci->lock, flags); |
04679b34 | 106 | |
03cd00d5 | 107 | usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status); |
04679b34 | 108 | |
b8868e45 | 109 | usbip_dbg_vhci_rx("Leave\n"); |
04679b34 TH |
110 | } |
111 | ||
04679b34 | 112 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, |
5ef6aceb | 113 | struct usbip_header *pdu) |
04679b34 TH |
114 | { |
115 | struct vhci_unlink *unlink, *tmp; | |
21619792 | 116 | unsigned long flags; |
04679b34 | 117 | |
21619792 | 118 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 TH |
119 | |
120 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
1a4b6f66 | 121 | pr_info("unlink->seqnum %lu\n", unlink->seqnum); |
04679b34 | 122 | if (unlink->seqnum == pdu->base.seqnum) { |
b8868e45 | 123 | usbip_dbg_vhci_rx("found pending unlink, %lu\n", |
5ef6aceb | 124 | unlink->seqnum); |
04679b34 TH |
125 | list_del(&unlink->list); |
126 | ||
21619792 | 127 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
128 | return unlink; |
129 | } | |
130 | } | |
131 | ||
21619792 | 132 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
133 | |
134 | return NULL; | |
135 | } | |
136 | ||
04679b34 | 137 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, |
5ef6aceb | 138 | struct usbip_header *pdu) |
04679b34 | 139 | { |
03cd00d5 YD |
140 | struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev); |
141 | struct vhci *vhci = vhci_hcd->vhci; | |
04679b34 TH |
142 | struct vhci_unlink *unlink; |
143 | struct urb *urb; | |
21619792 | 144 | unsigned long flags; |
04679b34 TH |
145 | |
146 | usbip_dump_header(pdu); | |
147 | ||
148 | unlink = dequeue_pending_unlink(vdev, pdu); | |
149 | if (!unlink) { | |
1a4b6f66 | 150 | pr_info("cannot find the pending unlink %u\n", |
151 | pdu->base.seqnum); | |
04679b34 TH |
152 | return; |
153 | } | |
154 | ||
21619792 | 155 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 | 156 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); |
21619792 | 157 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
b92a5e23 | 158 | |
04679b34 TH |
159 | if (!urb) { |
160 | /* | |
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 | |
163 | * back the URB. | |
164 | */ | |
3567f979 | 165 | pr_info("the urb (seqnum %d) was already given back\n", |
1a4b6f66 | 166 | pdu->base.seqnum); |
04679b34 | 167 | } else { |
8272d099 | 168 | usbip_dbg_vhci_rx("now giveback urb %d\n", pdu->base.seqnum); |
04679b34 | 169 | |
c7f00899 | 170 | /* If unlink is successful, status is -ECONNRESET */ |
04679b34 | 171 | urb->status = pdu->u.ret_unlink.status; |
1a4b6f66 | 172 | pr_info("urb->status %d\n", urb->status); |
04679b34 | 173 | |
0775a9cb | 174 | spin_lock_irqsave(&vhci->lock, flags); |
03cd00d5 | 175 | usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb); |
0775a9cb | 176 | spin_unlock_irqrestore(&vhci->lock, flags); |
04679b34 | 177 | |
03cd00d5 | 178 | usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status); |
04679b34 TH |
179 | } |
180 | ||
181 | kfree(unlink); | |
04679b34 TH |
182 | } |
183 | ||
bd65f623 MV |
184 | static int vhci_priv_tx_empty(struct vhci_device *vdev) |
185 | { | |
186 | int empty = 0; | |
21619792 | 187 | unsigned long flags; |
bd65f623 | 188 | |
21619792 | 189 | spin_lock_irqsave(&vdev->priv_lock, flags); |
bd65f623 | 190 | empty = list_empty(&vdev->priv_rx); |
21619792 | 191 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
bd65f623 MV |
192 | |
193 | return empty; | |
194 | } | |
195 | ||
04679b34 TH |
196 | /* recv a pdu */ |
197 | static void vhci_rx_pdu(struct usbip_device *ud) | |
198 | { | |
199 | int ret; | |
200 | struct usbip_header pdu; | |
201 | struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); | |
202 | ||
b8868e45 | 203 | usbip_dbg_vhci_rx("Enter\n"); |
04679b34 TH |
204 | |
205 | memset(&pdu, 0, sizeof(pdu)); | |
206 | ||
77178807 | 207 | /* receive a pdu header */ |
5a08c526 | 208 | ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu)); |
7e249c8b MV |
209 | if (ret < 0) { |
210 | if (ret == -ECONNRESET) | |
1a4b6f66 | 211 | pr_info("connection reset by peer\n"); |
bd65f623 MV |
212 | else if (ret == -EAGAIN) { |
213 | /* ignore if connection was idle */ | |
214 | if (vhci_priv_tx_empty(vdev)) | |
215 | return; | |
1a4b6f66 | 216 | pr_info("connection timed out with pending urbs\n"); |
bd65f623 | 217 | } else if (ret != -ERESTARTSYS) |
1a4b6f66 | 218 | pr_info("xmit failed %d\n", ret); |
bd65f623 | 219 | |
7e249c8b MV |
220 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
221 | return; | |
222 | } | |
223 | if (ret == 0) { | |
1a4b6f66 | 224 | pr_info("connection closed"); |
7e249c8b MV |
225 | usbip_event_add(ud, VDEV_EVENT_DOWN); |
226 | return; | |
227 | } | |
04679b34 | 228 | if (ret != sizeof(pdu)) { |
1a4b6f66 | 229 | pr_err("received pdu size is %d, should be %d\n", ret, |
230 | (unsigned int)sizeof(pdu)); | |
04679b34 TH |
231 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
232 | return; | |
233 | } | |
234 | ||
235 | usbip_header_correct_endian(&pdu, 0); | |
236 | ||
b8868e45 | 237 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
238 | usbip_dump_header(&pdu); |
239 | ||
240 | switch (pdu.base.command) { | |
241 | case USBIP_RET_SUBMIT: | |
242 | vhci_recv_ret_submit(vdev, &pdu); | |
243 | break; | |
244 | case USBIP_RET_UNLINK: | |
245 | vhci_recv_ret_unlink(vdev, &pdu); | |
246 | break; | |
247 | default: | |
49aecefc | 248 | /* NOT REACHED */ |
1a4b6f66 | 249 | pr_err("unknown pdu %u\n", pdu.base.command); |
04679b34 TH |
250 | usbip_dump_header(&pdu); |
251 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
49aecefc | 252 | break; |
04679b34 TH |
253 | } |
254 | } | |
255 | ||
9720b4bc | 256 | int vhci_rx_loop(void *data) |
04679b34 | 257 | { |
9720b4bc | 258 | struct usbip_device *ud = data; |
04679b34 | 259 | |
9720b4bc | 260 | while (!kthread_should_stop()) { |
b8868e45 | 261 | if (usbip_event_happened(ud)) |
04679b34 TH |
262 | break; |
263 | ||
894f1f4f | 264 | usbip_kcov_remote_start(ud); |
04679b34 | 265 | vhci_rx_pdu(ud); |
894f1f4f | 266 | usbip_kcov_remote_stop(); |
04679b34 | 267 | } |
04679b34 | 268 | |
9720b4bc AB |
269 | return 0; |
270 | } |