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04679b34 TH |
1 | /* |
2 | * Copyright (C) 2003-2008 Takahiro Hirofuchi | |
3 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
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, | |
17 | * USA. | |
18 | */ | |
19 | ||
9720b4bc | 20 | #include <linux/kthread.h> |
7aaacb43 | 21 | #include <linux/slab.h> |
5a0e3ad6 | 22 | |
04679b34 TH |
23 | #include "usbip_common.h" |
24 | #include "vhci.h" | |
25 | ||
b92a5e23 | 26 | /* get URB from transmitted urb queue. caller must hold vdev->priv_lock */ |
5ef6aceb | 27 | struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum) |
04679b34 TH |
28 | { |
29 | struct vhci_priv *priv, *tmp; | |
30 | struct urb *urb = NULL; | |
31 | int status; | |
32 | ||
04679b34 | 33 | list_for_each_entry_safe(priv, tmp, &vdev->priv_rx, list) { |
2663d79b SR |
34 | if (priv->seqnum != seqnum) |
35 | continue; | |
04679b34 | 36 | |
2663d79b SR |
37 | urb = priv->urb; |
38 | status = urb->status; | |
04679b34 | 39 | |
2663d79b SR |
40 | usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n", |
41 | urb, priv, seqnum); | |
04679b34 | 42 | |
2663d79b SR |
43 | switch (status) { |
44 | case -ENOENT: | |
45 | /* fall through */ | |
46 | case -ECONNRESET: | |
47 | dev_info(&urb->dev->dev, | |
48 | "urb %p was unlinked %ssynchronuously.\n", urb, | |
49 | status == -ENOENT ? "" : "a"); | |
50 | break; | |
51 | case -EINPROGRESS: | |
52 | /* no info output */ | |
04679b34 | 53 | break; |
2663d79b SR |
54 | default: |
55 | dev_info(&urb->dev->dev, | |
56 | "urb %p may be in a error, status %d\n", urb, | |
57 | status); | |
04679b34 | 58 | } |
2663d79b SR |
59 | |
60 | list_del(&priv->list); | |
61 | kfree(priv); | |
62 | urb->hcpriv = NULL; | |
63 | ||
64 | break; | |
04679b34 TH |
65 | } |
66 | ||
04679b34 TH |
67 | return urb; |
68 | } | |
69 | ||
70 | static void vhci_recv_ret_submit(struct vhci_device *vdev, | |
5ef6aceb | 71 | struct usbip_header *pdu) |
04679b34 | 72 | { |
0775a9cb | 73 | struct vhci_hcd *vhci = vdev_to_vhci(vdev); |
04679b34 TH |
74 | struct usbip_device *ud = &vdev->ud; |
75 | struct urb *urb; | |
21619792 | 76 | unsigned long flags; |
04679b34 | 77 | |
21619792 | 78 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 | 79 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); |
21619792 | 80 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
81 | |
82 | if (!urb) { | |
1a4b6f66 | 83 | pr_err("cannot find a urb of seqnum %u\n", pdu->base.seqnum); |
84 | pr_info("max seqnum %d\n", | |
0775a9cb | 85 | atomic_read(&vhci->seqnum)); |
04679b34 TH |
86 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
87 | return; | |
88 | } | |
89 | ||
04679b34 TH |
90 | /* unpack the pdu to a urb */ |
91 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
92 | ||
04679b34 TH |
93 | /* recv transfer buffer */ |
94 | if (usbip_recv_xbuff(ud, urb) < 0) | |
95 | return; | |
96 | ||
04679b34 TH |
97 | /* recv iso_packet_descriptor */ |
98 | if (usbip_recv_iso(ud, urb) < 0) | |
99 | return; | |
100 | ||
28276a28 | 101 | /* restore the padding in iso packets */ |
ac2b41ac | 102 | usbip_pad_iso(ud, urb); |
04679b34 | 103 | |
b8868e45 | 104 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
105 | usbip_dump_urb(urb); |
106 | ||
b8868e45 | 107 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 | 108 | |
0775a9cb NI |
109 | spin_lock_irqsave(&vhci->lock, flags); |
110 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb); | |
111 | spin_unlock_irqrestore(&vhci->lock, flags); | |
04679b34 | 112 | |
0775a9cb | 113 | usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status); |
04679b34 | 114 | |
b8868e45 | 115 | usbip_dbg_vhci_rx("Leave\n"); |
04679b34 TH |
116 | } |
117 | ||
04679b34 | 118 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, |
5ef6aceb | 119 | struct usbip_header *pdu) |
04679b34 TH |
120 | { |
121 | struct vhci_unlink *unlink, *tmp; | |
21619792 | 122 | unsigned long flags; |
04679b34 | 123 | |
21619792 | 124 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 TH |
125 | |
126 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
1a4b6f66 | 127 | pr_info("unlink->seqnum %lu\n", unlink->seqnum); |
04679b34 | 128 | if (unlink->seqnum == pdu->base.seqnum) { |
b8868e45 | 129 | usbip_dbg_vhci_rx("found pending unlink, %lu\n", |
5ef6aceb | 130 | unlink->seqnum); |
04679b34 TH |
131 | list_del(&unlink->list); |
132 | ||
21619792 | 133 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
134 | return unlink; |
135 | } | |
136 | } | |
137 | ||
21619792 | 138 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
04679b34 TH |
139 | |
140 | return NULL; | |
141 | } | |
142 | ||
04679b34 | 143 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, |
5ef6aceb | 144 | struct usbip_header *pdu) |
04679b34 | 145 | { |
0775a9cb | 146 | struct vhci_hcd *vhci = vdev_to_vhci(vdev); |
04679b34 TH |
147 | struct vhci_unlink *unlink; |
148 | struct urb *urb; | |
21619792 | 149 | unsigned long flags; |
04679b34 TH |
150 | |
151 | usbip_dump_header(pdu); | |
152 | ||
153 | unlink = dequeue_pending_unlink(vdev, pdu); | |
154 | if (!unlink) { | |
1a4b6f66 | 155 | pr_info("cannot find the pending unlink %u\n", |
156 | pdu->base.seqnum); | |
04679b34 TH |
157 | return; |
158 | } | |
159 | ||
21619792 | 160 | spin_lock_irqsave(&vdev->priv_lock, flags); |
04679b34 | 161 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); |
21619792 | 162 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
b92a5e23 | 163 | |
04679b34 TH |
164 | if (!urb) { |
165 | /* | |
166 | * I get the result of a unlink request. But, it seems that I | |
167 | * already received the result of its submit result and gave | |
168 | * back the URB. | |
169 | */ | |
3567f979 | 170 | pr_info("the urb (seqnum %d) was already given back\n", |
1a4b6f66 | 171 | pdu->base.seqnum); |
04679b34 | 172 | } else { |
b8868e45 | 173 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 | 174 | |
c7f00899 | 175 | /* If unlink is successful, status is -ECONNRESET */ |
04679b34 | 176 | urb->status = pdu->u.ret_unlink.status; |
1a4b6f66 | 177 | pr_info("urb->status %d\n", urb->status); |
04679b34 | 178 | |
0775a9cb NI |
179 | spin_lock_irqsave(&vhci->lock, flags); |
180 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(vhci), urb); | |
181 | spin_unlock_irqrestore(&vhci->lock, flags); | |
04679b34 | 182 | |
0775a9cb | 183 | usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status); |
04679b34 TH |
184 | } |
185 | ||
186 | kfree(unlink); | |
04679b34 TH |
187 | } |
188 | ||
bd65f623 MV |
189 | static int vhci_priv_tx_empty(struct vhci_device *vdev) |
190 | { | |
191 | int empty = 0; | |
21619792 | 192 | unsigned long flags; |
bd65f623 | 193 | |
21619792 | 194 | spin_lock_irqsave(&vdev->priv_lock, flags); |
bd65f623 | 195 | empty = list_empty(&vdev->priv_rx); |
21619792 | 196 | spin_unlock_irqrestore(&vdev->priv_lock, flags); |
bd65f623 MV |
197 | |
198 | return empty; | |
199 | } | |
200 | ||
04679b34 TH |
201 | /* recv a pdu */ |
202 | static void vhci_rx_pdu(struct usbip_device *ud) | |
203 | { | |
204 | int ret; | |
205 | struct usbip_header pdu; | |
206 | struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); | |
207 | ||
b8868e45 | 208 | usbip_dbg_vhci_rx("Enter\n"); |
04679b34 TH |
209 | |
210 | memset(&pdu, 0, sizeof(pdu)); | |
211 | ||
77178807 | 212 | /* receive a pdu header */ |
5a08c526 | 213 | ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu)); |
7e249c8b MV |
214 | if (ret < 0) { |
215 | if (ret == -ECONNRESET) | |
1a4b6f66 | 216 | pr_info("connection reset by peer\n"); |
bd65f623 MV |
217 | else if (ret == -EAGAIN) { |
218 | /* ignore if connection was idle */ | |
219 | if (vhci_priv_tx_empty(vdev)) | |
220 | return; | |
1a4b6f66 | 221 | pr_info("connection timed out with pending urbs\n"); |
bd65f623 | 222 | } else if (ret != -ERESTARTSYS) |
1a4b6f66 | 223 | pr_info("xmit failed %d\n", ret); |
bd65f623 | 224 | |
7e249c8b MV |
225 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
226 | return; | |
227 | } | |
228 | if (ret == 0) { | |
1a4b6f66 | 229 | pr_info("connection closed"); |
7e249c8b MV |
230 | usbip_event_add(ud, VDEV_EVENT_DOWN); |
231 | return; | |
232 | } | |
04679b34 | 233 | if (ret != sizeof(pdu)) { |
1a4b6f66 | 234 | pr_err("received pdu size is %d, should be %d\n", ret, |
235 | (unsigned int)sizeof(pdu)); | |
04679b34 TH |
236 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
237 | return; | |
238 | } | |
239 | ||
240 | usbip_header_correct_endian(&pdu, 0); | |
241 | ||
b8868e45 | 242 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
243 | usbip_dump_header(&pdu); |
244 | ||
245 | switch (pdu.base.command) { | |
246 | case USBIP_RET_SUBMIT: | |
247 | vhci_recv_ret_submit(vdev, &pdu); | |
248 | break; | |
249 | case USBIP_RET_UNLINK: | |
250 | vhci_recv_ret_unlink(vdev, &pdu); | |
251 | break; | |
252 | default: | |
49aecefc | 253 | /* NOT REACHED */ |
1a4b6f66 | 254 | pr_err("unknown pdu %u\n", pdu.base.command); |
04679b34 TH |
255 | usbip_dump_header(&pdu); |
256 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); | |
49aecefc | 257 | break; |
04679b34 TH |
258 | } |
259 | } | |
260 | ||
9720b4bc | 261 | int vhci_rx_loop(void *data) |
04679b34 | 262 | { |
9720b4bc | 263 | struct usbip_device *ud = data; |
04679b34 | 264 | |
9720b4bc | 265 | while (!kthread_should_stop()) { |
b8868e45 | 266 | if (usbip_event_happened(ud)) |
04679b34 TH |
267 | break; |
268 | ||
269 | vhci_rx_pdu(ud); | |
270 | } | |
04679b34 | 271 | |
9720b4bc AB |
272 | return 0; |
273 | } |