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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 TH |
72 | { |
73 | struct usbip_device *ud = &vdev->ud; | |
74 | struct urb *urb; | |
75 | ||
b92a5e23 | 76 | spin_lock(&vdev->priv_lock); |
04679b34 | 77 | urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum); |
b92a5e23 | 78 | spin_unlock(&vdev->priv_lock); |
04679b34 TH |
79 | |
80 | if (!urb) { | |
1a4b6f66 | 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)); | |
04679b34 TH |
84 | usbip_event_add(ud, VDEV_EVENT_ERROR_TCP); |
85 | return; | |
86 | } | |
87 | ||
04679b34 TH |
88 | /* unpack the pdu to a urb */ |
89 | usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0); | |
90 | ||
04679b34 TH |
91 | /* recv transfer buffer */ |
92 | if (usbip_recv_xbuff(ud, urb) < 0) | |
93 | return; | |
94 | ||
04679b34 TH |
95 | /* recv iso_packet_descriptor */ |
96 | if (usbip_recv_iso(ud, urb) < 0) | |
97 | return; | |
98 | ||
28276a28 | 99 | /* restore the padding in iso packets */ |
ac2b41ac | 100 | usbip_pad_iso(ud, urb); |
04679b34 | 101 | |
b8868e45 | 102 | if (usbip_dbg_flag_vhci_rx) |
04679b34 TH |
103 | usbip_dump_urb(urb); |
104 | ||
b8868e45 | 105 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
04679b34 | 106 | |
50b66b5c | 107 | spin_lock(&the_controller->lock); |
04679b34 | 108 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); |
50b66b5c | 109 | spin_unlock(&the_controller->lock); |
04679b34 TH |
110 | |
111 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status); | |
112 | ||
b8868e45 | 113 | usbip_dbg_vhci_rx("Leave\n"); |
04679b34 TH |
114 | } |
115 | ||
04679b34 | 116 | static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev, |
5ef6aceb | 117 | struct usbip_header *pdu) |
04679b34 TH |
118 | { |
119 | struct vhci_unlink *unlink, *tmp; | |
120 | ||
121 | spin_lock(&vdev->priv_lock); | |
122 | ||
123 | list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) { | |
1a4b6f66 | 124 | pr_info("unlink->seqnum %lu\n", unlink->seqnum); |
04679b34 | 125 | if (unlink->seqnum == pdu->base.seqnum) { |
b8868e45 | 126 | usbip_dbg_vhci_rx("found pending unlink, %lu\n", |
5ef6aceb | 127 | unlink->seqnum); |
04679b34 TH |
128 | list_del(&unlink->list); |
129 | ||
130 | spin_unlock(&vdev->priv_lock); | |
131 | return unlink; | |
132 | } | |
133 | } | |
134 | ||
135 | spin_unlock(&vdev->priv_lock); | |
136 | ||
137 | return NULL; | |
138 | } | |
139 | ||
04679b34 | 140 | static void vhci_recv_ret_unlink(struct vhci_device *vdev, |
5ef6aceb | 141 | struct usbip_header *pdu) |
04679b34 TH |
142 | { |
143 | struct vhci_unlink *unlink; | |
144 | struct urb *urb; | |
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 | ||
b92a5e23 | 155 | spin_lock(&vdev->priv_lock); |
04679b34 | 156 | urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum); |
b92a5e23 MV |
157 | spin_unlock(&vdev->priv_lock); |
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 { |
b8868e45 | 168 | usbip_dbg_vhci_rx("now giveback urb %p\n", urb); |
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 | |
50b66b5c | 174 | spin_lock(&the_controller->lock); |
04679b34 | 175 | usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb); |
50b66b5c | 176 | spin_unlock(&the_controller->lock); |
04679b34 TH |
177 | |
178 | usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, | |
5ef6aceb | 179 | urb->status); |
04679b34 TH |
180 | } |
181 | ||
182 | kfree(unlink); | |
04679b34 TH |
183 | } |
184 | ||
bd65f623 MV |
185 | static int vhci_priv_tx_empty(struct vhci_device *vdev) |
186 | { | |
187 | int empty = 0; | |
188 | ||
189 | spin_lock(&vdev->priv_lock); | |
bd65f623 | 190 | empty = list_empty(&vdev->priv_rx); |
bd65f623 MV |
191 | spin_unlock(&vdev->priv_lock); |
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 | ||
264 | vhci_rx_pdu(ud); | |
265 | } | |
04679b34 | 266 | |
9720b4bc AB |
267 | return 0; |
268 | } |