Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 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 | |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 20 | #include <linux/kthread.h> |
matt mooney | 7aaacb4 | 2011-05-11 22:33:43 -0700 | [diff] [blame] | 21 | #include <linux/socket.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 23 | #include "usbip_common.h" |
| 24 | #include "stub.h" |
| 25 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 26 | static void stub_free_priv_and_urb(struct stub_priv *priv) |
| 27 | { |
| 28 | struct urb *urb = priv->urb; |
| 29 | |
| 30 | kfree(urb->setup_packet); |
| 31 | kfree(urb->transfer_buffer); |
| 32 | list_del(&priv->list); |
| 33 | kmem_cache_free(stub_priv_cache, priv); |
| 34 | usb_free_urb(urb); |
| 35 | } |
| 36 | |
| 37 | /* be in spin_lock_irqsave(&sdev->priv_lock, flags) */ |
| 38 | void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum, |
| 39 | __u32 status) |
| 40 | { |
| 41 | struct stub_unlink *unlink; |
| 42 | |
| 43 | unlink = kzalloc(sizeof(struct stub_unlink), GFP_ATOMIC); |
| 44 | if (!unlink) { |
| 45 | dev_err(&sdev->interface->dev, "alloc stub_unlink\n"); |
| 46 | usbip_event_add(&sdev->ud, VDEV_EVENT_ERROR_MALLOC); |
| 47 | return; |
| 48 | } |
| 49 | |
| 50 | unlink->seqnum = seqnum; |
| 51 | unlink->status = status; |
| 52 | |
| 53 | list_add_tail(&unlink->list, &sdev->unlink_tx); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * stub_complete - completion handler of a usbip urb |
| 58 | * @urb: pointer to the urb completed |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 59 | * |
| 60 | * When a urb has completed, the USB core driver calls this function mostly in |
| 61 | * the interrupt context. To return the result of a urb, the completed urb is |
| 62 | * linked to the pending list of returning. |
| 63 | * |
| 64 | */ |
| 65 | void stub_complete(struct urb *urb) |
| 66 | { |
| 67 | struct stub_priv *priv = (struct stub_priv *) urb->context; |
| 68 | struct stub_device *sdev = priv->sdev; |
| 69 | unsigned long flags; |
| 70 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 71 | usbip_dbg_stub_tx("complete! status %d\n", urb->status); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 72 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 73 | switch (urb->status) { |
| 74 | case 0: |
| 75 | /* OK */ |
| 76 | break; |
| 77 | case -ENOENT: |
matt mooney | 1a4b6f6 | 2011-05-19 16:47:32 -0700 | [diff] [blame] | 78 | dev_info(&urb->dev->dev, "stopped by a call to usb_kill_urb() " |
| 79 | "because of cleaning up a virtual connection\n"); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 80 | return; |
| 81 | case -ECONNRESET: |
matt mooney | 1a4b6f6 | 2011-05-19 16:47:32 -0700 | [diff] [blame] | 82 | dev_info(&urb->dev->dev, "unlinked by a call to " |
| 83 | "usb_unlink_urb()\n"); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 84 | break; |
| 85 | case -EPIPE: |
matt mooney | 1a4b6f6 | 2011-05-19 16:47:32 -0700 | [diff] [blame] | 86 | dev_info(&urb->dev->dev, "endpoint %d is stalled\n", |
| 87 | usb_pipeendpoint(urb->pipe)); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 88 | break; |
| 89 | case -ESHUTDOWN: |
matt mooney | 1a4b6f6 | 2011-05-19 16:47:32 -0700 | [diff] [blame] | 90 | dev_info(&urb->dev->dev, "device removed?\n"); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 91 | break; |
| 92 | default: |
matt mooney | 1a4b6f6 | 2011-05-19 16:47:32 -0700 | [diff] [blame] | 93 | dev_info(&urb->dev->dev, "urb completion with non-zero status " |
| 94 | "%d\n", urb->status); |
matt mooney | 49aecef | 2011-05-06 03:47:54 -0700 | [diff] [blame] | 95 | break; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | /* link a urb to the queue of tx. */ |
| 99 | spin_lock_irqsave(&sdev->priv_lock, flags); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 100 | if (priv->unlinking) { |
| 101 | stub_enqueue_ret_unlink(sdev, priv->seqnum, urb->status); |
| 102 | stub_free_priv_and_urb(priv); |
matt mooney | 8735276 | 2011-05-19 21:36:56 -0700 | [diff] [blame] | 103 | } else { |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 104 | list_move_tail(&priv->list, &sdev->priv_tx); |
matt mooney | 8735276 | 2011-05-19 21:36:56 -0700 | [diff] [blame] | 105 | } |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 106 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 107 | |
| 108 | /* wake up tx_thread */ |
| 109 | wake_up(&sdev->tx_waitq); |
| 110 | } |
| 111 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 112 | static inline void setup_base_pdu(struct usbip_header_basic *base, |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 113 | __u32 command, __u32 seqnum) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 114 | { |
matt mooney | 8735276 | 2011-05-19 21:36:56 -0700 | [diff] [blame] | 115 | base->command = command; |
| 116 | base->seqnum = seqnum; |
| 117 | base->devid = 0; |
| 118 | base->ep = 0; |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 119 | base->direction = 0; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static void setup_ret_submit_pdu(struct usbip_header *rpdu, struct urb *urb) |
| 123 | { |
| 124 | struct stub_priv *priv = (struct stub_priv *) urb->context; |
| 125 | |
| 126 | setup_base_pdu(&rpdu->base, USBIP_RET_SUBMIT, priv->seqnum); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 127 | usbip_pack_pdu(rpdu, urb, USBIP_RET_SUBMIT, 1); |
| 128 | } |
| 129 | |
| 130 | static void setup_ret_unlink_pdu(struct usbip_header *rpdu, |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 131 | struct stub_unlink *unlink) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 132 | { |
| 133 | setup_base_pdu(&rpdu->base, USBIP_RET_UNLINK, unlink->seqnum); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 134 | rpdu->u.ret_unlink.status = unlink->status; |
| 135 | } |
| 136 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 137 | static struct stub_priv *dequeue_from_priv_tx(struct stub_device *sdev) |
| 138 | { |
| 139 | unsigned long flags; |
| 140 | struct stub_priv *priv, *tmp; |
| 141 | |
| 142 | spin_lock_irqsave(&sdev->priv_lock, flags); |
| 143 | |
| 144 | list_for_each_entry_safe(priv, tmp, &sdev->priv_tx, list) { |
| 145 | list_move_tail(&priv->list, &sdev->priv_free); |
| 146 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 147 | return priv; |
| 148 | } |
| 149 | |
| 150 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 151 | |
| 152 | return NULL; |
| 153 | } |
| 154 | |
| 155 | static int stub_send_ret_submit(struct stub_device *sdev) |
| 156 | { |
| 157 | unsigned long flags; |
| 158 | struct stub_priv *priv, *tmp; |
| 159 | |
| 160 | struct msghdr msg; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 161 | size_t txsize; |
| 162 | |
| 163 | size_t total_size = 0; |
| 164 | |
| 165 | while ((priv = dequeue_from_priv_tx(sdev)) != NULL) { |
| 166 | int ret; |
| 167 | struct urb *urb = priv->urb; |
| 168 | struct usbip_header pdu_header; |
| 169 | void *iso_buffer = NULL; |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 170 | struct kvec *iov = NULL; |
| 171 | int iovnum = 0; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 172 | |
| 173 | txsize = 0; |
| 174 | memset(&pdu_header, 0, sizeof(pdu_header)); |
| 175 | memset(&msg, 0, sizeof(msg)); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 176 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 177 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) |
| 178 | iovnum = 2 + urb->number_of_packets; |
| 179 | else |
| 180 | iovnum = 2; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 181 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 182 | iov = kzalloc(iovnum * sizeof(struct kvec), GFP_KERNEL); |
| 183 | |
| 184 | if (!iov) { |
| 185 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_MALLOC); |
| 186 | return -1; |
| 187 | } |
| 188 | |
| 189 | iovnum = 0; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 190 | |
| 191 | /* 1. setup usbip_header */ |
| 192 | setup_ret_submit_pdu(&pdu_header, urb); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 193 | usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n", |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 194 | pdu_header.base.seqnum, urb); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 195 | /*usbip_dump_header(pdu_header);*/ |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 196 | usbip_header_correct_endian(&pdu_header, 1); |
| 197 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 198 | iov[iovnum].iov_base = &pdu_header; |
| 199 | iov[iovnum].iov_len = sizeof(pdu_header); |
| 200 | iovnum++; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 201 | txsize += sizeof(pdu_header); |
| 202 | |
| 203 | /* 2. setup transfer buffer */ |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 204 | if (usb_pipein(urb->pipe) && |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 205 | usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS && |
| 206 | urb->actual_length > 0) { |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 207 | iov[iovnum].iov_base = urb->transfer_buffer; |
| 208 | iov[iovnum].iov_len = urb->actual_length; |
| 209 | iovnum++; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 210 | txsize += urb->actual_length; |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 211 | } else if (usb_pipein(urb->pipe) && |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 212 | usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 213 | /* |
| 214 | * For isochronous packets: actual length is the sum of |
| 215 | * the actual length of the individual, packets, but as |
| 216 | * the packet offsets are not changed there will be |
| 217 | * padding between the packets. To optimally use the |
| 218 | * bandwidth the padding is not transmitted. |
| 219 | */ |
| 220 | |
| 221 | int i; |
| 222 | for (i = 0; i < urb->number_of_packets; i++) { |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 223 | iov[iovnum].iov_base = urb->transfer_buffer + |
| 224 | urb->iso_frame_desc[i].offset; |
| 225 | iov[iovnum].iov_len = |
| 226 | urb->iso_frame_desc[i].actual_length; |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 227 | iovnum++; |
| 228 | txsize += urb->iso_frame_desc[i].actual_length; |
| 229 | } |
| 230 | |
| 231 | if (txsize != sizeof(pdu_header) + urb->actual_length) { |
| 232 | dev_err(&sdev->interface->dev, |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 233 | "actual length of urb %d does not " |
Randy Dunlap | 6394c5a | 2011-07-07 10:49:54 -0700 | [diff] [blame] | 234 | "match iso packet sizes %zu\n", |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 235 | urb->actual_length, |
| 236 | txsize-sizeof(pdu_header)); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 237 | kfree(iov); |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 238 | usbip_event_add(&sdev->ud, |
| 239 | SDEV_EVENT_ERROR_TCP); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 240 | return -1; |
| 241 | } |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | /* 3. setup iso_packet_descriptor */ |
| 245 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
| 246 | ssize_t len = 0; |
| 247 | |
| 248 | iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); |
| 249 | if (!iso_buffer) { |
| 250 | usbip_event_add(&sdev->ud, |
| 251 | SDEV_EVENT_ERROR_MALLOC); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 252 | kfree(iov); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 253 | return -1; |
| 254 | } |
| 255 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 256 | iov[iovnum].iov_base = iso_buffer; |
| 257 | iov[iovnum].iov_len = len; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 258 | txsize += len; |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 259 | iovnum++; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 260 | } |
| 261 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 262 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, |
| 263 | iov, iovnum, txsize); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 264 | if (ret != txsize) { |
| 265 | dev_err(&sdev->interface->dev, |
| 266 | "sendmsg failed!, retval %d for %zd\n", |
| 267 | ret, txsize); |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 268 | kfree(iov); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 269 | kfree(iso_buffer); |
| 270 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); |
| 271 | return -1; |
| 272 | } |
| 273 | |
Arjan Mels | 28276a2 | 2011-04-05 20:26:59 +0200 | [diff] [blame] | 274 | kfree(iov); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 275 | kfree(iso_buffer); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 276 | |
| 277 | total_size += txsize; |
| 278 | } |
| 279 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 280 | spin_lock_irqsave(&sdev->priv_lock, flags); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 281 | list_for_each_entry_safe(priv, tmp, &sdev->priv_free, list) { |
| 282 | stub_free_priv_and_urb(priv); |
| 283 | } |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 284 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 285 | |
| 286 | return total_size; |
| 287 | } |
| 288 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 289 | static struct stub_unlink *dequeue_from_unlink_tx(struct stub_device *sdev) |
| 290 | { |
| 291 | unsigned long flags; |
| 292 | struct stub_unlink *unlink, *tmp; |
| 293 | |
| 294 | spin_lock_irqsave(&sdev->priv_lock, flags); |
| 295 | |
| 296 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) { |
| 297 | list_move_tail(&unlink->list, &sdev->unlink_free); |
| 298 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 299 | return unlink; |
| 300 | } |
| 301 | |
| 302 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 303 | |
| 304 | return NULL; |
| 305 | } |
| 306 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 307 | static int stub_send_ret_unlink(struct stub_device *sdev) |
| 308 | { |
| 309 | unsigned long flags; |
| 310 | struct stub_unlink *unlink, *tmp; |
| 311 | |
| 312 | struct msghdr msg; |
| 313 | struct kvec iov[1]; |
| 314 | size_t txsize; |
| 315 | |
| 316 | size_t total_size = 0; |
| 317 | |
| 318 | while ((unlink = dequeue_from_unlink_tx(sdev)) != NULL) { |
| 319 | int ret; |
| 320 | struct usbip_header pdu_header; |
| 321 | |
| 322 | txsize = 0; |
| 323 | memset(&pdu_header, 0, sizeof(pdu_header)); |
| 324 | memset(&msg, 0, sizeof(msg)); |
| 325 | memset(&iov, 0, sizeof(iov)); |
| 326 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 327 | usbip_dbg_stub_tx("setup ret unlink %lu\n", unlink->seqnum); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 328 | |
| 329 | /* 1. setup usbip_header */ |
| 330 | setup_ret_unlink_pdu(&pdu_header, unlink); |
| 331 | usbip_header_correct_endian(&pdu_header, 1); |
| 332 | |
| 333 | iov[0].iov_base = &pdu_header; |
| 334 | iov[0].iov_len = sizeof(pdu_header); |
| 335 | txsize += sizeof(pdu_header); |
| 336 | |
| 337 | ret = kernel_sendmsg(sdev->ud.tcp_socket, &msg, iov, |
| 338 | 1, txsize); |
| 339 | if (ret != txsize) { |
| 340 | dev_err(&sdev->interface->dev, |
| 341 | "sendmsg failed!, retval %d for %zd\n", |
| 342 | ret, txsize); |
| 343 | usbip_event_add(&sdev->ud, SDEV_EVENT_ERROR_TCP); |
| 344 | return -1; |
| 345 | } |
| 346 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 347 | usbip_dbg_stub_tx("send txdata\n"); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 348 | total_size += txsize; |
| 349 | } |
| 350 | |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 351 | spin_lock_irqsave(&sdev->priv_lock, flags); |
| 352 | |
| 353 | list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, list) { |
| 354 | list_del(&unlink->list); |
| 355 | kfree(unlink); |
| 356 | } |
| 357 | |
| 358 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
| 359 | |
| 360 | return total_size; |
| 361 | } |
| 362 | |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 363 | int stub_tx_loop(void *data) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 364 | { |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 365 | struct usbip_device *ud = data; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 366 | struct stub_device *sdev = container_of(ud, struct stub_device, ud); |
| 367 | |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 368 | while (!kthread_should_stop()) { |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 369 | if (usbip_event_happened(ud)) |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 370 | break; |
| 371 | |
| 372 | /* |
| 373 | * send_ret_submit comes earlier than send_ret_unlink. stub_rx |
| 374 | * looks at only priv_init queue. If the completion of a URB is |
| 375 | * earlier than the receive of CMD_UNLINK, priv is moved to |
| 376 | * priv_tx queue and stub_rx does not find the target priv. In |
| 377 | * this case, vhci_rx receives the result of the submit request |
| 378 | * and then receives the result of the unlink request. The |
| 379 | * result of the submit is given back to the usbcore as the |
| 380 | * completion of the unlink request. The request of the |
| 381 | * unlink is ignored. This is ok because a driver who calls |
| 382 | * usb_unlink_urb() understands the unlink was too late by |
| 383 | * getting the status of the given-backed URB which has the |
| 384 | * status of usb_submit_urb(). |
| 385 | */ |
| 386 | if (stub_send_ret_submit(sdev) < 0) |
| 387 | break; |
| 388 | |
| 389 | if (stub_send_ret_unlink(sdev) < 0) |
| 390 | break; |
| 391 | |
| 392 | wait_event_interruptible(sdev->tx_waitq, |
matt mooney | c6956c9 | 2011-05-06 03:47:44 -0700 | [diff] [blame] | 393 | (!list_empty(&sdev->priv_tx) || |
| 394 | !list_empty(&sdev->unlink_tx) || |
| 395 | kthread_should_stop())); |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 396 | } |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 397 | |
| 398 | return 0; |
Takahiro Hirofuchi | 4d7b5c7 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 399 | } |