| 1 | /* |
| 2 | * USB Network driver infrastructure |
| 3 | * Copyright (C) 2000-2005 by David Brownell |
| 4 | * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * This is a generic "USB networking" framework that works with several |
| 22 | * kinds of full and high speed networking devices: host-to-host cables, |
| 23 | * smart usb peripherals, and actual Ethernet adapters. |
| 24 | * |
| 25 | * These devices usually differ in terms of control protocols (if they |
| 26 | * even have one!) and sometimes they define new framing to wrap or batch |
| 27 | * Ethernet packets. Otherwise, they talk to USB pretty much the same, |
| 28 | * so interface (un)binding, endpoint I/O queues, fault handling, and other |
| 29 | * issues can usefully be addressed by this framework. |
| 30 | */ |
| 31 | |
| 32 | // #define DEBUG // error path messages, extra info |
| 33 | // #define VERBOSE // more; success messages |
| 34 | |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/netdevice.h> |
| 38 | #include <linux/etherdevice.h> |
| 39 | #include <linux/ctype.h> |
| 40 | #include <linux/ethtool.h> |
| 41 | #include <linux/workqueue.h> |
| 42 | #include <linux/mii.h> |
| 43 | #include <linux/usb.h> |
| 44 | #include <linux/usb/usbnet.h> |
| 45 | #include <linux/slab.h> |
| 46 | #include <linux/kernel.h> |
| 47 | #include <linux/pm_runtime.h> |
| 48 | |
| 49 | #define DRIVER_VERSION "22-Aug-2005" |
| 50 | |
| 51 | |
| 52 | /*-------------------------------------------------------------------------*/ |
| 53 | |
| 54 | /* |
| 55 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. |
| 56 | * Several dozen bytes of IPv4 data can fit in two such transactions. |
| 57 | * One maximum size Ethernet packet takes twenty four of them. |
| 58 | * For high speed, each frame comfortably fits almost 36 max size |
| 59 | * Ethernet packets (so queues should be bigger). |
| 60 | * |
| 61 | * The goal is to let the USB host controller be busy for 5msec or |
| 62 | * more before an irq is required, under load. Jumbograms change |
| 63 | * the equation. |
| 64 | */ |
| 65 | #define MAX_QUEUE_MEMORY (60 * 1518) |
| 66 | #define RX_QLEN(dev) ((dev)->rx_qlen) |
| 67 | #define TX_QLEN(dev) ((dev)->tx_qlen) |
| 68 | |
| 69 | // reawaken network queue this soon after stopping; else watchdog barks |
| 70 | #define TX_TIMEOUT_JIFFIES (5*HZ) |
| 71 | |
| 72 | /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() |
| 73 | * us (it polls at HZ/4 usually) before we report too many false errors. |
| 74 | */ |
| 75 | #define THROTTLE_JIFFIES (HZ/8) |
| 76 | |
| 77 | // between wakeups |
| 78 | #define UNLINK_TIMEOUT_MS 3 |
| 79 | |
| 80 | /*-------------------------------------------------------------------------*/ |
| 81 | |
| 82 | // randomly generated ethernet address |
| 83 | static u8 node_id [ETH_ALEN]; |
| 84 | |
| 85 | static const char driver_name [] = "usbnet"; |
| 86 | |
| 87 | /* use ethtool to change the level for any given device */ |
| 88 | static int msg_level = -1; |
| 89 | module_param (msg_level, int, 0); |
| 90 | MODULE_PARM_DESC (msg_level, "Override default message level"); |
| 91 | |
| 92 | /*-------------------------------------------------------------------------*/ |
| 93 | |
| 94 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
| 95 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
| 96 | { |
| 97 | int tmp; |
| 98 | struct usb_host_interface *alt = NULL; |
| 99 | struct usb_host_endpoint *in = NULL, *out = NULL; |
| 100 | struct usb_host_endpoint *status = NULL; |
| 101 | |
| 102 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { |
| 103 | unsigned ep; |
| 104 | |
| 105 | in = out = status = NULL; |
| 106 | alt = intf->altsetting + tmp; |
| 107 | |
| 108 | /* take the first altsetting with in-bulk + out-bulk; |
| 109 | * remember any status endpoint, just in case; |
| 110 | * ignore other endpoints and altsettings. |
| 111 | */ |
| 112 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { |
| 113 | struct usb_host_endpoint *e; |
| 114 | int intr = 0; |
| 115 | |
| 116 | e = alt->endpoint + ep; |
| 117 | switch (e->desc.bmAttributes) { |
| 118 | case USB_ENDPOINT_XFER_INT: |
| 119 | if (!usb_endpoint_dir_in(&e->desc)) |
| 120 | continue; |
| 121 | intr = 1; |
| 122 | /* FALLTHROUGH */ |
| 123 | case USB_ENDPOINT_XFER_BULK: |
| 124 | break; |
| 125 | default: |
| 126 | continue; |
| 127 | } |
| 128 | if (usb_endpoint_dir_in(&e->desc)) { |
| 129 | if (!intr && !in) |
| 130 | in = e; |
| 131 | else if (intr && !status) |
| 132 | status = e; |
| 133 | } else { |
| 134 | if (!out) |
| 135 | out = e; |
| 136 | } |
| 137 | } |
| 138 | if (in && out) |
| 139 | break; |
| 140 | } |
| 141 | if (!alt || !in || !out) |
| 142 | return -EINVAL; |
| 143 | |
| 144 | if (alt->desc.bAlternateSetting != 0 || |
| 145 | !(dev->driver_info->flags & FLAG_NO_SETINT)) { |
| 146 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, |
| 147 | alt->desc.bAlternateSetting); |
| 148 | if (tmp < 0) |
| 149 | return tmp; |
| 150 | } |
| 151 | |
| 152 | dev->in = usb_rcvbulkpipe (dev->udev, |
| 153 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 154 | dev->out = usb_sndbulkpipe (dev->udev, |
| 155 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 156 | dev->status = status; |
| 157 | return 0; |
| 158 | } |
| 159 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
| 160 | |
| 161 | int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) |
| 162 | { |
| 163 | int tmp = -1, ret; |
| 164 | unsigned char buf [13]; |
| 165 | |
| 166 | ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); |
| 167 | if (ret == 12) |
| 168 | tmp = hex2bin(dev->net->dev_addr, buf, 6); |
| 169 | if (tmp < 0) { |
| 170 | dev_dbg(&dev->udev->dev, |
| 171 | "bad MAC string %d fetch, %d\n", iMACAddress, tmp); |
| 172 | if (ret >= 0) |
| 173 | ret = -EINVAL; |
| 174 | return ret; |
| 175 | } |
| 176 | return 0; |
| 177 | } |
| 178 | EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); |
| 179 | |
| 180 | static void intr_complete (struct urb *urb) |
| 181 | { |
| 182 | struct usbnet *dev = urb->context; |
| 183 | int status = urb->status; |
| 184 | |
| 185 | switch (status) { |
| 186 | /* success */ |
| 187 | case 0: |
| 188 | dev->driver_info->status(dev, urb); |
| 189 | break; |
| 190 | |
| 191 | /* software-driven interface shutdown */ |
| 192 | case -ENOENT: /* urb killed */ |
| 193 | case -ESHUTDOWN: /* hardware gone */ |
| 194 | netif_dbg(dev, ifdown, dev->net, |
| 195 | "intr shutdown, code %d\n", status); |
| 196 | return; |
| 197 | |
| 198 | /* NOTE: not throttling like RX/TX, since this endpoint |
| 199 | * already polls infrequently |
| 200 | */ |
| 201 | default: |
| 202 | netdev_dbg(dev->net, "intr status %d\n", status); |
| 203 | break; |
| 204 | } |
| 205 | |
| 206 | status = usb_submit_urb (urb, GFP_ATOMIC); |
| 207 | if (status != 0) |
| 208 | netif_err(dev, timer, dev->net, |
| 209 | "intr resubmit --> %d\n", status); |
| 210 | } |
| 211 | |
| 212 | static int init_status (struct usbnet *dev, struct usb_interface *intf) |
| 213 | { |
| 214 | char *buf = NULL; |
| 215 | unsigned pipe = 0; |
| 216 | unsigned maxp; |
| 217 | unsigned period; |
| 218 | |
| 219 | if (!dev->driver_info->status) |
| 220 | return 0; |
| 221 | |
| 222 | pipe = usb_rcvintpipe (dev->udev, |
| 223 | dev->status->desc.bEndpointAddress |
| 224 | & USB_ENDPOINT_NUMBER_MASK); |
| 225 | maxp = usb_maxpacket (dev->udev, pipe, 0); |
| 226 | |
| 227 | /* avoid 1 msec chatter: min 8 msec poll rate */ |
| 228 | period = max ((int) dev->status->desc.bInterval, |
| 229 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); |
| 230 | |
| 231 | buf = kmalloc (maxp, GFP_KERNEL); |
| 232 | if (buf) { |
| 233 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
| 234 | if (!dev->interrupt) { |
| 235 | kfree (buf); |
| 236 | return -ENOMEM; |
| 237 | } else { |
| 238 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, |
| 239 | buf, maxp, intr_complete, dev, period); |
| 240 | dev->interrupt->transfer_flags |= URB_FREE_BUFFER; |
| 241 | dev_dbg(&intf->dev, |
| 242 | "status ep%din, %d bytes period %d\n", |
| 243 | usb_pipeendpoint(pipe), maxp, period); |
| 244 | } |
| 245 | } |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | /* Submit the interrupt URB if not previously submitted, increasing refcount */ |
| 250 | int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) |
| 251 | { |
| 252 | int ret = 0; |
| 253 | |
| 254 | WARN_ON_ONCE(dev->interrupt == NULL); |
| 255 | if (dev->interrupt) { |
| 256 | mutex_lock(&dev->interrupt_mutex); |
| 257 | |
| 258 | if (++dev->interrupt_count == 1) |
| 259 | ret = usb_submit_urb(dev->interrupt, mem_flags); |
| 260 | |
| 261 | dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", |
| 262 | dev->interrupt_count); |
| 263 | mutex_unlock(&dev->interrupt_mutex); |
| 264 | } |
| 265 | return ret; |
| 266 | } |
| 267 | EXPORT_SYMBOL_GPL(usbnet_status_start); |
| 268 | |
| 269 | /* For resume; submit interrupt URB if previously submitted */ |
| 270 | static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) |
| 271 | { |
| 272 | int ret = 0; |
| 273 | |
| 274 | mutex_lock(&dev->interrupt_mutex); |
| 275 | if (dev->interrupt_count) { |
| 276 | ret = usb_submit_urb(dev->interrupt, mem_flags); |
| 277 | dev_dbg(&dev->udev->dev, |
| 278 | "submitted interrupt URB for resume\n"); |
| 279 | } |
| 280 | mutex_unlock(&dev->interrupt_mutex); |
| 281 | return ret; |
| 282 | } |
| 283 | |
| 284 | /* Kill the interrupt URB if all submitters want it killed */ |
| 285 | void usbnet_status_stop(struct usbnet *dev) |
| 286 | { |
| 287 | if (dev->interrupt) { |
| 288 | mutex_lock(&dev->interrupt_mutex); |
| 289 | WARN_ON(dev->interrupt_count == 0); |
| 290 | |
| 291 | if (dev->interrupt_count && --dev->interrupt_count == 0) |
| 292 | usb_kill_urb(dev->interrupt); |
| 293 | |
| 294 | dev_dbg(&dev->udev->dev, |
| 295 | "decremented interrupt URB count to %d\n", |
| 296 | dev->interrupt_count); |
| 297 | mutex_unlock(&dev->interrupt_mutex); |
| 298 | } |
| 299 | } |
| 300 | EXPORT_SYMBOL_GPL(usbnet_status_stop); |
| 301 | |
| 302 | /* For suspend; always kill interrupt URB */ |
| 303 | static void __usbnet_status_stop_force(struct usbnet *dev) |
| 304 | { |
| 305 | if (dev->interrupt) { |
| 306 | mutex_lock(&dev->interrupt_mutex); |
| 307 | usb_kill_urb(dev->interrupt); |
| 308 | dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); |
| 309 | mutex_unlock(&dev->interrupt_mutex); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /* Passes this packet up the stack, updating its accounting. |
| 314 | * Some link protocols batch packets, so their rx_fixup paths |
| 315 | * can return clones as well as just modify the original skb. |
| 316 | */ |
| 317 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) |
| 318 | { |
| 319 | int status; |
| 320 | |
| 321 | if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { |
| 322 | skb_queue_tail(&dev->rxq_pause, skb); |
| 323 | return; |
| 324 | } |
| 325 | |
| 326 | /* only update if unset to allow minidriver rx_fixup override */ |
| 327 | if (skb->protocol == 0) |
| 328 | skb->protocol = eth_type_trans (skb, dev->net); |
| 329 | |
| 330 | dev->net->stats.rx_packets++; |
| 331 | dev->net->stats.rx_bytes += skb->len; |
| 332 | |
| 333 | netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", |
| 334 | skb->len + sizeof (struct ethhdr), skb->protocol); |
| 335 | memset (skb->cb, 0, sizeof (struct skb_data)); |
| 336 | |
| 337 | if (skb_defer_rx_timestamp(skb)) |
| 338 | return; |
| 339 | |
| 340 | status = netif_rx (skb); |
| 341 | if (status != NET_RX_SUCCESS) |
| 342 | netif_dbg(dev, rx_err, dev->net, |
| 343 | "netif_rx status %d\n", status); |
| 344 | } |
| 345 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
| 346 | |
| 347 | /* must be called if hard_mtu or rx_urb_size changed */ |
| 348 | void usbnet_update_max_qlen(struct usbnet *dev) |
| 349 | { |
| 350 | enum usb_device_speed speed = dev->udev->speed; |
| 351 | |
| 352 | switch (speed) { |
| 353 | case USB_SPEED_HIGH: |
| 354 | dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; |
| 355 | dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; |
| 356 | break; |
| 357 | case USB_SPEED_SUPER: |
| 358 | case USB_SPEED_SUPER_PLUS: |
| 359 | /* |
| 360 | * Not take default 5ms qlen for super speed HC to |
| 361 | * save memory, and iperf tests show 2.5ms qlen can |
| 362 | * work well |
| 363 | */ |
| 364 | dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; |
| 365 | dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; |
| 366 | break; |
| 367 | default: |
| 368 | dev->rx_qlen = dev->tx_qlen = 4; |
| 369 | } |
| 370 | } |
| 371 | EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); |
| 372 | |
| 373 | \f |
| 374 | /*------------------------------------------------------------------------- |
| 375 | * |
| 376 | * Network Device Driver (peer link to "Host Device", from USB host) |
| 377 | * |
| 378 | *-------------------------------------------------------------------------*/ |
| 379 | |
| 380 | int usbnet_change_mtu (struct net_device *net, int new_mtu) |
| 381 | { |
| 382 | struct usbnet *dev = netdev_priv(net); |
| 383 | int ll_mtu = new_mtu + net->hard_header_len; |
| 384 | int old_hard_mtu = dev->hard_mtu; |
| 385 | int old_rx_urb_size = dev->rx_urb_size; |
| 386 | |
| 387 | if (new_mtu <= 0) |
| 388 | return -EINVAL; |
| 389 | // no second zero-length packet read wanted after mtu-sized packets |
| 390 | if ((ll_mtu % dev->maxpacket) == 0) |
| 391 | return -EDOM; |
| 392 | net->mtu = new_mtu; |
| 393 | |
| 394 | dev->hard_mtu = net->mtu + net->hard_header_len; |
| 395 | if (dev->rx_urb_size == old_hard_mtu) { |
| 396 | dev->rx_urb_size = dev->hard_mtu; |
| 397 | if (dev->rx_urb_size > old_rx_urb_size) { |
| 398 | usbnet_pause_rx(dev); |
| 399 | usbnet_unlink_rx_urbs(dev); |
| 400 | usbnet_resume_rx(dev); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | /* max qlen depend on hard_mtu and rx_urb_size */ |
| 405 | usbnet_update_max_qlen(dev); |
| 406 | |
| 407 | return 0; |
| 408 | } |
| 409 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
| 410 | |
| 411 | /* The caller must hold list->lock */ |
| 412 | static void __usbnet_queue_skb(struct sk_buff_head *list, |
| 413 | struct sk_buff *newsk, enum skb_state state) |
| 414 | { |
| 415 | struct skb_data *entry = (struct skb_data *) newsk->cb; |
| 416 | |
| 417 | __skb_queue_tail(list, newsk); |
| 418 | entry->state = state; |
| 419 | } |
| 420 | |
| 421 | /*-------------------------------------------------------------------------*/ |
| 422 | |
| 423 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
| 424 | * completion callbacks. 2.5 should have fixed those bugs... |
| 425 | */ |
| 426 | |
| 427 | static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, |
| 428 | struct sk_buff_head *list, enum skb_state state) |
| 429 | { |
| 430 | unsigned long flags; |
| 431 | enum skb_state old_state; |
| 432 | struct skb_data *entry = (struct skb_data *) skb->cb; |
| 433 | |
| 434 | spin_lock_irqsave(&list->lock, flags); |
| 435 | old_state = entry->state; |
| 436 | entry->state = state; |
| 437 | __skb_unlink(skb, list); |
| 438 | |
| 439 | /* defer_bh() is never called with list == &dev->done. |
| 440 | * spin_lock_nested() tells lockdep that it is OK to take |
| 441 | * dev->done.lock here with list->lock held. |
| 442 | */ |
| 443 | spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); |
| 444 | |
| 445 | __skb_queue_tail(&dev->done, skb); |
| 446 | if (dev->done.qlen == 1) |
| 447 | tasklet_schedule(&dev->bh); |
| 448 | spin_unlock(&dev->done.lock); |
| 449 | spin_unlock_irqrestore(&list->lock, flags); |
| 450 | return old_state; |
| 451 | } |
| 452 | |
| 453 | /* some work can't be done in tasklets, so we use keventd |
| 454 | * |
| 455 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, |
| 456 | * but tasklet_schedule() doesn't. hope the failure is rare. |
| 457 | */ |
| 458 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
| 459 | { |
| 460 | set_bit (work, &dev->flags); |
| 461 | if (!schedule_work (&dev->kevent)) { |
| 462 | if (net_ratelimit()) |
| 463 | netdev_err(dev->net, "kevent %d may have been dropped\n", work); |
| 464 | } else { |
| 465 | netdev_dbg(dev->net, "kevent %d scheduled\n", work); |
| 466 | } |
| 467 | } |
| 468 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
| 469 | |
| 470 | /*-------------------------------------------------------------------------*/ |
| 471 | |
| 472 | static void rx_complete (struct urb *urb); |
| 473 | |
| 474 | static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
| 475 | { |
| 476 | struct sk_buff *skb; |
| 477 | struct skb_data *entry; |
| 478 | int retval = 0; |
| 479 | unsigned long lockflags; |
| 480 | size_t size = dev->rx_urb_size; |
| 481 | |
| 482 | /* prevent rx skb allocation when error ratio is high */ |
| 483 | if (test_bit(EVENT_RX_KILL, &dev->flags)) { |
| 484 | usb_free_urb(urb); |
| 485 | return -ENOLINK; |
| 486 | } |
| 487 | |
| 488 | skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); |
| 489 | if (!skb) { |
| 490 | netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); |
| 491 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
| 492 | usb_free_urb (urb); |
| 493 | return -ENOMEM; |
| 494 | } |
| 495 | |
| 496 | entry = (struct skb_data *) skb->cb; |
| 497 | entry->urb = urb; |
| 498 | entry->dev = dev; |
| 499 | entry->length = 0; |
| 500 | |
| 501 | usb_fill_bulk_urb (urb, dev->udev, dev->in, |
| 502 | skb->data, size, rx_complete, skb); |
| 503 | |
| 504 | spin_lock_irqsave (&dev->rxq.lock, lockflags); |
| 505 | |
| 506 | if (netif_running (dev->net) && |
| 507 | netif_device_present (dev->net) && |
| 508 | !test_bit (EVENT_RX_HALT, &dev->flags) && |
| 509 | !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { |
| 510 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { |
| 511 | case -EPIPE: |
| 512 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
| 513 | break; |
| 514 | case -ENOMEM: |
| 515 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
| 516 | break; |
| 517 | case -ENODEV: |
| 518 | netif_dbg(dev, ifdown, dev->net, "device gone\n"); |
| 519 | netif_device_detach (dev->net); |
| 520 | break; |
| 521 | case -EHOSTUNREACH: |
| 522 | retval = -ENOLINK; |
| 523 | break; |
| 524 | default: |
| 525 | netif_dbg(dev, rx_err, dev->net, |
| 526 | "rx submit, %d\n", retval); |
| 527 | tasklet_schedule (&dev->bh); |
| 528 | break; |
| 529 | case 0: |
| 530 | __usbnet_queue_skb(&dev->rxq, skb, rx_start); |
| 531 | } |
| 532 | } else { |
| 533 | netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); |
| 534 | retval = -ENOLINK; |
| 535 | } |
| 536 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); |
| 537 | if (retval) { |
| 538 | dev_kfree_skb_any (skb); |
| 539 | usb_free_urb (urb); |
| 540 | } |
| 541 | return retval; |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /*-------------------------------------------------------------------------*/ |
| 546 | |
| 547 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) |
| 548 | { |
| 549 | if (dev->driver_info->rx_fixup && |
| 550 | !dev->driver_info->rx_fixup (dev, skb)) { |
| 551 | /* With RX_ASSEMBLE, rx_fixup() must update counters */ |
| 552 | if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) |
| 553 | dev->net->stats.rx_errors++; |
| 554 | goto done; |
| 555 | } |
| 556 | // else network stack removes extra byte if we forced a short packet |
| 557 | |
| 558 | /* all data was already cloned from skb inside the driver */ |
| 559 | if (dev->driver_info->flags & FLAG_MULTI_PACKET) |
| 560 | goto done; |
| 561 | |
| 562 | if (skb->len < ETH_HLEN) { |
| 563 | dev->net->stats.rx_errors++; |
| 564 | dev->net->stats.rx_length_errors++; |
| 565 | netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); |
| 566 | } else { |
| 567 | usbnet_skb_return(dev, skb); |
| 568 | return; |
| 569 | } |
| 570 | |
| 571 | done: |
| 572 | skb_queue_tail(&dev->done, skb); |
| 573 | } |
| 574 | |
| 575 | /*-------------------------------------------------------------------------*/ |
| 576 | |
| 577 | static void rx_complete (struct urb *urb) |
| 578 | { |
| 579 | struct sk_buff *skb = (struct sk_buff *) urb->context; |
| 580 | struct skb_data *entry = (struct skb_data *) skb->cb; |
| 581 | struct usbnet *dev = entry->dev; |
| 582 | int urb_status = urb->status; |
| 583 | enum skb_state state; |
| 584 | |
| 585 | skb_put (skb, urb->actual_length); |
| 586 | state = rx_done; |
| 587 | entry->urb = NULL; |
| 588 | |
| 589 | switch (urb_status) { |
| 590 | /* success */ |
| 591 | case 0: |
| 592 | break; |
| 593 | |
| 594 | /* stalls need manual reset. this is rare ... except that |
| 595 | * when going through USB 2.0 TTs, unplug appears this way. |
| 596 | * we avoid the highspeed version of the ETIMEDOUT/EILSEQ |
| 597 | * storm, recovering as needed. |
| 598 | */ |
| 599 | case -EPIPE: |
| 600 | dev->net->stats.rx_errors++; |
| 601 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
| 602 | // FALLTHROUGH |
| 603 | |
| 604 | /* software-driven interface shutdown */ |
| 605 | case -ECONNRESET: /* async unlink */ |
| 606 | case -ESHUTDOWN: /* hardware gone */ |
| 607 | netif_dbg(dev, ifdown, dev->net, |
| 608 | "rx shutdown, code %d\n", urb_status); |
| 609 | goto block; |
| 610 | |
| 611 | /* we get controller i/o faults during hub_wq disconnect() delays. |
| 612 | * throttle down resubmits, to avoid log floods; just temporarily, |
| 613 | * so we still recover when the fault isn't a hub_wq delay. |
| 614 | */ |
| 615 | case -EPROTO: |
| 616 | case -ETIME: |
| 617 | case -EILSEQ: |
| 618 | dev->net->stats.rx_errors++; |
| 619 | if (!timer_pending (&dev->delay)) { |
| 620 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); |
| 621 | netif_dbg(dev, link, dev->net, |
| 622 | "rx throttle %d\n", urb_status); |
| 623 | } |
| 624 | block: |
| 625 | state = rx_cleanup; |
| 626 | entry->urb = urb; |
| 627 | urb = NULL; |
| 628 | break; |
| 629 | |
| 630 | /* data overrun ... flush fifo? */ |
| 631 | case -EOVERFLOW: |
| 632 | dev->net->stats.rx_over_errors++; |
| 633 | // FALLTHROUGH |
| 634 | |
| 635 | default: |
| 636 | state = rx_cleanup; |
| 637 | dev->net->stats.rx_errors++; |
| 638 | netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | /* stop rx if packet error rate is high */ |
| 643 | if (++dev->pkt_cnt > 30) { |
| 644 | dev->pkt_cnt = 0; |
| 645 | dev->pkt_err = 0; |
| 646 | } else { |
| 647 | if (state == rx_cleanup) |
| 648 | dev->pkt_err++; |
| 649 | if (dev->pkt_err > 20) |
| 650 | set_bit(EVENT_RX_KILL, &dev->flags); |
| 651 | } |
| 652 | |
| 653 | state = defer_bh(dev, skb, &dev->rxq, state); |
| 654 | |
| 655 | if (urb) { |
| 656 | if (netif_running (dev->net) && |
| 657 | !test_bit (EVENT_RX_HALT, &dev->flags) && |
| 658 | state != unlink_start) { |
| 659 | rx_submit (dev, urb, GFP_ATOMIC); |
| 660 | usb_mark_last_busy(dev->udev); |
| 661 | return; |
| 662 | } |
| 663 | usb_free_urb (urb); |
| 664 | } |
| 665 | netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); |
| 666 | } |
| 667 | |
| 668 | /*-------------------------------------------------------------------------*/ |
| 669 | void usbnet_pause_rx(struct usbnet *dev) |
| 670 | { |
| 671 | set_bit(EVENT_RX_PAUSED, &dev->flags); |
| 672 | |
| 673 | netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); |
| 674 | } |
| 675 | EXPORT_SYMBOL_GPL(usbnet_pause_rx); |
| 676 | |
| 677 | void usbnet_resume_rx(struct usbnet *dev) |
| 678 | { |
| 679 | struct sk_buff *skb; |
| 680 | int num = 0; |
| 681 | |
| 682 | clear_bit(EVENT_RX_PAUSED, &dev->flags); |
| 683 | |
| 684 | while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { |
| 685 | usbnet_skb_return(dev, skb); |
| 686 | num++; |
| 687 | } |
| 688 | |
| 689 | tasklet_schedule(&dev->bh); |
| 690 | |
| 691 | netif_dbg(dev, rx_status, dev->net, |
| 692 | "paused rx queue disabled, %d skbs requeued\n", num); |
| 693 | } |
| 694 | EXPORT_SYMBOL_GPL(usbnet_resume_rx); |
| 695 | |
| 696 | void usbnet_purge_paused_rxq(struct usbnet *dev) |
| 697 | { |
| 698 | skb_queue_purge(&dev->rxq_pause); |
| 699 | } |
| 700 | EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); |
| 701 | |
| 702 | /*-------------------------------------------------------------------------*/ |
| 703 | |
| 704 | // unlink pending rx/tx; completion handlers do all other cleanup |
| 705 | |
| 706 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) |
| 707 | { |
| 708 | unsigned long flags; |
| 709 | struct sk_buff *skb; |
| 710 | int count = 0; |
| 711 | |
| 712 | spin_lock_irqsave (&q->lock, flags); |
| 713 | while (!skb_queue_empty(q)) { |
| 714 | struct skb_data *entry; |
| 715 | struct urb *urb; |
| 716 | int retval; |
| 717 | |
| 718 | skb_queue_walk(q, skb) { |
| 719 | entry = (struct skb_data *) skb->cb; |
| 720 | if (entry->state != unlink_start) |
| 721 | goto found; |
| 722 | } |
| 723 | break; |
| 724 | found: |
| 725 | entry->state = unlink_start; |
| 726 | urb = entry->urb; |
| 727 | |
| 728 | /* |
| 729 | * Get reference count of the URB to avoid it to be |
| 730 | * freed during usb_unlink_urb, which may trigger |
| 731 | * use-after-free problem inside usb_unlink_urb since |
| 732 | * usb_unlink_urb is always racing with .complete |
| 733 | * handler(include defer_bh). |
| 734 | */ |
| 735 | usb_get_urb(urb); |
| 736 | spin_unlock_irqrestore(&q->lock, flags); |
| 737 | // during some PM-driven resume scenarios, |
| 738 | // these (async) unlinks complete immediately |
| 739 | retval = usb_unlink_urb (urb); |
| 740 | if (retval != -EINPROGRESS && retval != 0) |
| 741 | netdev_dbg(dev->net, "unlink urb err, %d\n", retval); |
| 742 | else |
| 743 | count++; |
| 744 | usb_put_urb(urb); |
| 745 | spin_lock_irqsave(&q->lock, flags); |
| 746 | } |
| 747 | spin_unlock_irqrestore (&q->lock, flags); |
| 748 | return count; |
| 749 | } |
| 750 | |
| 751 | // Flush all pending rx urbs |
| 752 | // minidrivers may need to do this when the MTU changes |
| 753 | |
| 754 | void usbnet_unlink_rx_urbs(struct usbnet *dev) |
| 755 | { |
| 756 | if (netif_running(dev->net)) { |
| 757 | (void) unlink_urbs (dev, &dev->rxq); |
| 758 | tasklet_schedule(&dev->bh); |
| 759 | } |
| 760 | } |
| 761 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); |
| 762 | |
| 763 | /*-------------------------------------------------------------------------*/ |
| 764 | |
| 765 | static void wait_skb_queue_empty(struct sk_buff_head *q) |
| 766 | { |
| 767 | unsigned long flags; |
| 768 | |
| 769 | spin_lock_irqsave(&q->lock, flags); |
| 770 | while (!skb_queue_empty(q)) { |
| 771 | spin_unlock_irqrestore(&q->lock, flags); |
| 772 | schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); |
| 773 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 774 | spin_lock_irqsave(&q->lock, flags); |
| 775 | } |
| 776 | spin_unlock_irqrestore(&q->lock, flags); |
| 777 | } |
| 778 | |
| 779 | // precondition: never called in_interrupt |
| 780 | static void usbnet_terminate_urbs(struct usbnet *dev) |
| 781 | { |
| 782 | DECLARE_WAITQUEUE(wait, current); |
| 783 | int temp; |
| 784 | |
| 785 | /* ensure there are no more active urbs */ |
| 786 | add_wait_queue(&dev->wait, &wait); |
| 787 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 788 | temp = unlink_urbs(dev, &dev->txq) + |
| 789 | unlink_urbs(dev, &dev->rxq); |
| 790 | |
| 791 | /* maybe wait for deletions to finish. */ |
| 792 | wait_skb_queue_empty(&dev->rxq); |
| 793 | wait_skb_queue_empty(&dev->txq); |
| 794 | wait_skb_queue_empty(&dev->done); |
| 795 | netif_dbg(dev, ifdown, dev->net, |
| 796 | "waited for %d urb completions\n", temp); |
| 797 | set_current_state(TASK_RUNNING); |
| 798 | remove_wait_queue(&dev->wait, &wait); |
| 799 | } |
| 800 | |
| 801 | int usbnet_stop (struct net_device *net) |
| 802 | { |
| 803 | struct usbnet *dev = netdev_priv(net); |
| 804 | struct driver_info *info = dev->driver_info; |
| 805 | int retval, pm, mpn; |
| 806 | |
| 807 | clear_bit(EVENT_DEV_OPEN, &dev->flags); |
| 808 | netif_stop_queue (net); |
| 809 | |
| 810 | netif_info(dev, ifdown, dev->net, |
| 811 | "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", |
| 812 | net->stats.rx_packets, net->stats.tx_packets, |
| 813 | net->stats.rx_errors, net->stats.tx_errors); |
| 814 | |
| 815 | /* to not race resume */ |
| 816 | pm = usb_autopm_get_interface(dev->intf); |
| 817 | /* allow minidriver to stop correctly (wireless devices to turn off |
| 818 | * radio etc) */ |
| 819 | if (info->stop) { |
| 820 | retval = info->stop(dev); |
| 821 | if (retval < 0) |
| 822 | netif_info(dev, ifdown, dev->net, |
| 823 | "stop fail (%d) usbnet usb-%s-%s, %s\n", |
| 824 | retval, |
| 825 | dev->udev->bus->bus_name, dev->udev->devpath, |
| 826 | info->description); |
| 827 | } |
| 828 | |
| 829 | if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) |
| 830 | usbnet_terminate_urbs(dev); |
| 831 | |
| 832 | usbnet_status_stop(dev); |
| 833 | |
| 834 | usbnet_purge_paused_rxq(dev); |
| 835 | |
| 836 | mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); |
| 837 | |
| 838 | /* deferred work (task, timer, softirq) must also stop. |
| 839 | * can't flush_scheduled_work() until we drop rtnl (later), |
| 840 | * else workers could deadlock; so make workers a NOP. |
| 841 | */ |
| 842 | dev->flags = 0; |
| 843 | del_timer_sync (&dev->delay); |
| 844 | tasklet_kill (&dev->bh); |
| 845 | if (!pm) |
| 846 | usb_autopm_put_interface(dev->intf); |
| 847 | |
| 848 | if (info->manage_power && mpn) |
| 849 | info->manage_power(dev, 0); |
| 850 | else |
| 851 | usb_autopm_put_interface(dev->intf); |
| 852 | |
| 853 | return 0; |
| 854 | } |
| 855 | EXPORT_SYMBOL_GPL(usbnet_stop); |
| 856 | |
| 857 | /*-------------------------------------------------------------------------*/ |
| 858 | |
| 859 | // posts reads, and enables write queuing |
| 860 | |
| 861 | // precondition: never called in_interrupt |
| 862 | |
| 863 | int usbnet_open (struct net_device *net) |
| 864 | { |
| 865 | struct usbnet *dev = netdev_priv(net); |
| 866 | int retval; |
| 867 | struct driver_info *info = dev->driver_info; |
| 868 | |
| 869 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { |
| 870 | netif_info(dev, ifup, dev->net, |
| 871 | "resumption fail (%d) usbnet usb-%s-%s, %s\n", |
| 872 | retval, |
| 873 | dev->udev->bus->bus_name, |
| 874 | dev->udev->devpath, |
| 875 | info->description); |
| 876 | goto done_nopm; |
| 877 | } |
| 878 | |
| 879 | // put into "known safe" state |
| 880 | if (info->reset && (retval = info->reset (dev)) < 0) { |
| 881 | netif_info(dev, ifup, dev->net, |
| 882 | "open reset fail (%d) usbnet usb-%s-%s, %s\n", |
| 883 | retval, |
| 884 | dev->udev->bus->bus_name, |
| 885 | dev->udev->devpath, |
| 886 | info->description); |
| 887 | goto done; |
| 888 | } |
| 889 | |
| 890 | /* hard_mtu or rx_urb_size may change in reset() */ |
| 891 | usbnet_update_max_qlen(dev); |
| 892 | |
| 893 | // insist peer be connected |
| 894 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { |
| 895 | netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); |
| 896 | goto done; |
| 897 | } |
| 898 | |
| 899 | /* start any status interrupt transfer */ |
| 900 | if (dev->interrupt) { |
| 901 | retval = usbnet_status_start(dev, GFP_KERNEL); |
| 902 | if (retval < 0) { |
| 903 | netif_err(dev, ifup, dev->net, |
| 904 | "intr submit %d\n", retval); |
| 905 | goto done; |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | set_bit(EVENT_DEV_OPEN, &dev->flags); |
| 910 | netif_start_queue (net); |
| 911 | netif_info(dev, ifup, dev->net, |
| 912 | "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", |
| 913 | (int)RX_QLEN(dev), (int)TX_QLEN(dev), |
| 914 | dev->net->mtu, |
| 915 | (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : |
| 916 | (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : |
| 917 | (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : |
| 918 | (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : |
| 919 | (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : |
| 920 | "simple"); |
| 921 | |
| 922 | /* reset rx error state */ |
| 923 | dev->pkt_cnt = 0; |
| 924 | dev->pkt_err = 0; |
| 925 | clear_bit(EVENT_RX_KILL, &dev->flags); |
| 926 | |
| 927 | // delay posting reads until we're fully open |
| 928 | tasklet_schedule (&dev->bh); |
| 929 | if (info->manage_power) { |
| 930 | retval = info->manage_power(dev, 1); |
| 931 | if (retval < 0) { |
| 932 | retval = 0; |
| 933 | set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); |
| 934 | } else { |
| 935 | usb_autopm_put_interface(dev->intf); |
| 936 | } |
| 937 | } |
| 938 | return retval; |
| 939 | done: |
| 940 | usb_autopm_put_interface(dev->intf); |
| 941 | done_nopm: |
| 942 | return retval; |
| 943 | } |
| 944 | EXPORT_SYMBOL_GPL(usbnet_open); |
| 945 | |
| 946 | /*-------------------------------------------------------------------------*/ |
| 947 | |
| 948 | /* ethtool methods; minidrivers may need to add some more, but |
| 949 | * they'll probably want to use this base set. |
| 950 | */ |
| 951 | |
| 952 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
| 953 | { |
| 954 | struct usbnet *dev = netdev_priv(net); |
| 955 | |
| 956 | if (!dev->mii.mdio_read) |
| 957 | return -EOPNOTSUPP; |
| 958 | |
| 959 | return mii_ethtool_gset(&dev->mii, cmd); |
| 960 | } |
| 961 | EXPORT_SYMBOL_GPL(usbnet_get_settings); |
| 962 | |
| 963 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) |
| 964 | { |
| 965 | struct usbnet *dev = netdev_priv(net); |
| 966 | int retval; |
| 967 | |
| 968 | if (!dev->mii.mdio_write) |
| 969 | return -EOPNOTSUPP; |
| 970 | |
| 971 | retval = mii_ethtool_sset(&dev->mii, cmd); |
| 972 | |
| 973 | /* link speed/duplex might have changed */ |
| 974 | if (dev->driver_info->link_reset) |
| 975 | dev->driver_info->link_reset(dev); |
| 976 | |
| 977 | /* hard_mtu or rx_urb_size may change in link_reset() */ |
| 978 | usbnet_update_max_qlen(dev); |
| 979 | |
| 980 | return retval; |
| 981 | |
| 982 | } |
| 983 | EXPORT_SYMBOL_GPL(usbnet_set_settings); |
| 984 | |
| 985 | u32 usbnet_get_link (struct net_device *net) |
| 986 | { |
| 987 | struct usbnet *dev = netdev_priv(net); |
| 988 | |
| 989 | /* If a check_connect is defined, return its result */ |
| 990 | if (dev->driver_info->check_connect) |
| 991 | return dev->driver_info->check_connect (dev) == 0; |
| 992 | |
| 993 | /* if the device has mii operations, use those */ |
| 994 | if (dev->mii.mdio_read) |
| 995 | return mii_link_ok(&dev->mii); |
| 996 | |
| 997 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ |
| 998 | return ethtool_op_get_link(net); |
| 999 | } |
| 1000 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
| 1001 | |
| 1002 | int usbnet_nway_reset(struct net_device *net) |
| 1003 | { |
| 1004 | struct usbnet *dev = netdev_priv(net); |
| 1005 | |
| 1006 | if (!dev->mii.mdio_write) |
| 1007 | return -EOPNOTSUPP; |
| 1008 | |
| 1009 | return mii_nway_restart(&dev->mii); |
| 1010 | } |
| 1011 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
| 1012 | |
| 1013 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
| 1014 | { |
| 1015 | struct usbnet *dev = netdev_priv(net); |
| 1016 | |
| 1017 | strlcpy (info->driver, dev->driver_name, sizeof info->driver); |
| 1018 | strlcpy (info->version, DRIVER_VERSION, sizeof info->version); |
| 1019 | strlcpy (info->fw_version, dev->driver_info->description, |
| 1020 | sizeof info->fw_version); |
| 1021 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); |
| 1022 | } |
| 1023 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
| 1024 | |
| 1025 | u32 usbnet_get_msglevel (struct net_device *net) |
| 1026 | { |
| 1027 | struct usbnet *dev = netdev_priv(net); |
| 1028 | |
| 1029 | return dev->msg_enable; |
| 1030 | } |
| 1031 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); |
| 1032 | |
| 1033 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
| 1034 | { |
| 1035 | struct usbnet *dev = netdev_priv(net); |
| 1036 | |
| 1037 | dev->msg_enable = level; |
| 1038 | } |
| 1039 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
| 1040 | |
| 1041 | /* drivers may override default ethtool_ops in their bind() routine */ |
| 1042 | static const struct ethtool_ops usbnet_ethtool_ops = { |
| 1043 | .get_settings = usbnet_get_settings, |
| 1044 | .set_settings = usbnet_set_settings, |
| 1045 | .get_link = usbnet_get_link, |
| 1046 | .nway_reset = usbnet_nway_reset, |
| 1047 | .get_drvinfo = usbnet_get_drvinfo, |
| 1048 | .get_msglevel = usbnet_get_msglevel, |
| 1049 | .set_msglevel = usbnet_set_msglevel, |
| 1050 | .get_ts_info = ethtool_op_get_ts_info, |
| 1051 | }; |
| 1052 | |
| 1053 | /*-------------------------------------------------------------------------*/ |
| 1054 | |
| 1055 | static void __handle_link_change(struct usbnet *dev) |
| 1056 | { |
| 1057 | if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) |
| 1058 | return; |
| 1059 | |
| 1060 | if (!netif_carrier_ok(dev->net)) { |
| 1061 | /* kill URBs for reading packets to save bus bandwidth */ |
| 1062 | unlink_urbs(dev, &dev->rxq); |
| 1063 | |
| 1064 | /* |
| 1065 | * tx_timeout will unlink URBs for sending packets and |
| 1066 | * tx queue is stopped by netcore after link becomes off |
| 1067 | */ |
| 1068 | } else { |
| 1069 | /* submitting URBs for reading packets */ |
| 1070 | tasklet_schedule(&dev->bh); |
| 1071 | } |
| 1072 | |
| 1073 | /* hard_mtu or rx_urb_size may change during link change */ |
| 1074 | usbnet_update_max_qlen(dev); |
| 1075 | |
| 1076 | clear_bit(EVENT_LINK_CHANGE, &dev->flags); |
| 1077 | } |
| 1078 | |
| 1079 | static void usbnet_set_rx_mode(struct net_device *net) |
| 1080 | { |
| 1081 | struct usbnet *dev = netdev_priv(net); |
| 1082 | |
| 1083 | usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); |
| 1084 | } |
| 1085 | |
| 1086 | static void __handle_set_rx_mode(struct usbnet *dev) |
| 1087 | { |
| 1088 | if (dev->driver_info->set_rx_mode) |
| 1089 | (dev->driver_info->set_rx_mode)(dev); |
| 1090 | |
| 1091 | clear_bit(EVENT_SET_RX_MODE, &dev->flags); |
| 1092 | } |
| 1093 | |
| 1094 | /* work that cannot be done in interrupt context uses keventd. |
| 1095 | * |
| 1096 | * NOTE: with 2.5 we could do more of this using completion callbacks, |
| 1097 | * especially now that control transfers can be queued. |
| 1098 | */ |
| 1099 | static void |
| 1100 | usbnet_deferred_kevent (struct work_struct *work) |
| 1101 | { |
| 1102 | struct usbnet *dev = |
| 1103 | container_of(work, struct usbnet, kevent); |
| 1104 | int status; |
| 1105 | |
| 1106 | /* usb_clear_halt() needs a thread context */ |
| 1107 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { |
| 1108 | unlink_urbs (dev, &dev->txq); |
| 1109 | status = usb_autopm_get_interface(dev->intf); |
| 1110 | if (status < 0) |
| 1111 | goto fail_pipe; |
| 1112 | status = usb_clear_halt (dev->udev, dev->out); |
| 1113 | usb_autopm_put_interface(dev->intf); |
| 1114 | if (status < 0 && |
| 1115 | status != -EPIPE && |
| 1116 | status != -ESHUTDOWN) { |
| 1117 | if (netif_msg_tx_err (dev)) |
| 1118 | fail_pipe: |
| 1119 | netdev_err(dev->net, "can't clear tx halt, status %d\n", |
| 1120 | status); |
| 1121 | } else { |
| 1122 | clear_bit (EVENT_TX_HALT, &dev->flags); |
| 1123 | if (status != -ESHUTDOWN) |
| 1124 | netif_wake_queue (dev->net); |
| 1125 | } |
| 1126 | } |
| 1127 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { |
| 1128 | unlink_urbs (dev, &dev->rxq); |
| 1129 | status = usb_autopm_get_interface(dev->intf); |
| 1130 | if (status < 0) |
| 1131 | goto fail_halt; |
| 1132 | status = usb_clear_halt (dev->udev, dev->in); |
| 1133 | usb_autopm_put_interface(dev->intf); |
| 1134 | if (status < 0 && |
| 1135 | status != -EPIPE && |
| 1136 | status != -ESHUTDOWN) { |
| 1137 | if (netif_msg_rx_err (dev)) |
| 1138 | fail_halt: |
| 1139 | netdev_err(dev->net, "can't clear rx halt, status %d\n", |
| 1140 | status); |
| 1141 | } else { |
| 1142 | clear_bit (EVENT_RX_HALT, &dev->flags); |
| 1143 | tasklet_schedule (&dev->bh); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | /* tasklet could resubmit itself forever if memory is tight */ |
| 1148 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { |
| 1149 | struct urb *urb = NULL; |
| 1150 | int resched = 1; |
| 1151 | |
| 1152 | if (netif_running (dev->net)) |
| 1153 | urb = usb_alloc_urb (0, GFP_KERNEL); |
| 1154 | else |
| 1155 | clear_bit (EVENT_RX_MEMORY, &dev->flags); |
| 1156 | if (urb != NULL) { |
| 1157 | clear_bit (EVENT_RX_MEMORY, &dev->flags); |
| 1158 | status = usb_autopm_get_interface(dev->intf); |
| 1159 | if (status < 0) { |
| 1160 | usb_free_urb(urb); |
| 1161 | goto fail_lowmem; |
| 1162 | } |
| 1163 | if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) |
| 1164 | resched = 0; |
| 1165 | usb_autopm_put_interface(dev->intf); |
| 1166 | fail_lowmem: |
| 1167 | if (resched) |
| 1168 | tasklet_schedule (&dev->bh); |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
| 1173 | struct driver_info *info = dev->driver_info; |
| 1174 | int retval = 0; |
| 1175 | |
| 1176 | clear_bit (EVENT_LINK_RESET, &dev->flags); |
| 1177 | status = usb_autopm_get_interface(dev->intf); |
| 1178 | if (status < 0) |
| 1179 | goto skip_reset; |
| 1180 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { |
| 1181 | usb_autopm_put_interface(dev->intf); |
| 1182 | skip_reset: |
| 1183 | netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", |
| 1184 | retval, |
| 1185 | dev->udev->bus->bus_name, |
| 1186 | dev->udev->devpath, |
| 1187 | info->description); |
| 1188 | } else { |
| 1189 | usb_autopm_put_interface(dev->intf); |
| 1190 | } |
| 1191 | |
| 1192 | /* handle link change from link resetting */ |
| 1193 | __handle_link_change(dev); |
| 1194 | } |
| 1195 | |
| 1196 | if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) |
| 1197 | __handle_link_change(dev); |
| 1198 | |
| 1199 | if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) |
| 1200 | __handle_set_rx_mode(dev); |
| 1201 | |
| 1202 | |
| 1203 | if (dev->flags) |
| 1204 | netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); |
| 1205 | } |
| 1206 | |
| 1207 | /*-------------------------------------------------------------------------*/ |
| 1208 | |
| 1209 | static void tx_complete (struct urb *urb) |
| 1210 | { |
| 1211 | struct sk_buff *skb = (struct sk_buff *) urb->context; |
| 1212 | struct skb_data *entry = (struct skb_data *) skb->cb; |
| 1213 | struct usbnet *dev = entry->dev; |
| 1214 | |
| 1215 | if (urb->status == 0) { |
| 1216 | dev->net->stats.tx_packets += entry->packets; |
| 1217 | dev->net->stats.tx_bytes += entry->length; |
| 1218 | } else { |
| 1219 | dev->net->stats.tx_errors++; |
| 1220 | |
| 1221 | switch (urb->status) { |
| 1222 | case -EPIPE: |
| 1223 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
| 1224 | break; |
| 1225 | |
| 1226 | /* software-driven interface shutdown */ |
| 1227 | case -ECONNRESET: // async unlink |
| 1228 | case -ESHUTDOWN: // hardware gone |
| 1229 | break; |
| 1230 | |
| 1231 | /* like rx, tx gets controller i/o faults during hub_wq |
| 1232 | * delays and so it uses the same throttling mechanism. |
| 1233 | */ |
| 1234 | case -EPROTO: |
| 1235 | case -ETIME: |
| 1236 | case -EILSEQ: |
| 1237 | usb_mark_last_busy(dev->udev); |
| 1238 | if (!timer_pending (&dev->delay)) { |
| 1239 | mod_timer (&dev->delay, |
| 1240 | jiffies + THROTTLE_JIFFIES); |
| 1241 | netif_dbg(dev, link, dev->net, |
| 1242 | "tx throttle %d\n", urb->status); |
| 1243 | } |
| 1244 | netif_stop_queue (dev->net); |
| 1245 | break; |
| 1246 | default: |
| 1247 | netif_dbg(dev, tx_err, dev->net, |
| 1248 | "tx err %d\n", entry->urb->status); |
| 1249 | break; |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | usb_autopm_put_interface_async(dev->intf); |
| 1254 | (void) defer_bh(dev, skb, &dev->txq, tx_done); |
| 1255 | } |
| 1256 | |
| 1257 | /*-------------------------------------------------------------------------*/ |
| 1258 | |
| 1259 | void usbnet_tx_timeout (struct net_device *net) |
| 1260 | { |
| 1261 | struct usbnet *dev = netdev_priv(net); |
| 1262 | |
| 1263 | unlink_urbs (dev, &dev->txq); |
| 1264 | tasklet_schedule (&dev->bh); |
| 1265 | /* this needs to be handled individually because the generic layer |
| 1266 | * doesn't know what is sufficient and could not restore private |
| 1267 | * information if a remedy of an unconditional reset were used. |
| 1268 | */ |
| 1269 | if (dev->driver_info->recover) |
| 1270 | (dev->driver_info->recover)(dev); |
| 1271 | } |
| 1272 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); |
| 1273 | |
| 1274 | /*-------------------------------------------------------------------------*/ |
| 1275 | |
| 1276 | static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) |
| 1277 | { |
| 1278 | unsigned num_sgs, total_len = 0; |
| 1279 | int i, s = 0; |
| 1280 | |
| 1281 | num_sgs = skb_shinfo(skb)->nr_frags + 1; |
| 1282 | if (num_sgs == 1) |
| 1283 | return 0; |
| 1284 | |
| 1285 | /* reserve one for zero packet */ |
| 1286 | urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), |
| 1287 | GFP_ATOMIC); |
| 1288 | if (!urb->sg) |
| 1289 | return -ENOMEM; |
| 1290 | |
| 1291 | urb->num_sgs = num_sgs; |
| 1292 | sg_init_table(urb->sg, urb->num_sgs + 1); |
| 1293 | |
| 1294 | sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); |
| 1295 | total_len += skb_headlen(skb); |
| 1296 | |
| 1297 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 1298 | struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; |
| 1299 | |
| 1300 | total_len += skb_frag_size(f); |
| 1301 | sg_set_page(&urb->sg[i + s], f->page.p, f->size, |
| 1302 | f->page_offset); |
| 1303 | } |
| 1304 | urb->transfer_buffer_length = total_len; |
| 1305 | |
| 1306 | return 1; |
| 1307 | } |
| 1308 | |
| 1309 | netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, |
| 1310 | struct net_device *net) |
| 1311 | { |
| 1312 | struct usbnet *dev = netdev_priv(net); |
| 1313 | unsigned int length; |
| 1314 | struct urb *urb = NULL; |
| 1315 | struct skb_data *entry; |
| 1316 | struct driver_info *info = dev->driver_info; |
| 1317 | unsigned long flags; |
| 1318 | int retval; |
| 1319 | |
| 1320 | if (skb) |
| 1321 | skb_tx_timestamp(skb); |
| 1322 | |
| 1323 | // some devices want funky USB-level framing, for |
| 1324 | // win32 driver (usually) and/or hardware quirks |
| 1325 | if (info->tx_fixup) { |
| 1326 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); |
| 1327 | if (!skb) { |
| 1328 | /* packet collected; minidriver waiting for more */ |
| 1329 | if (info->flags & FLAG_MULTI_PACKET) |
| 1330 | goto not_drop; |
| 1331 | netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); |
| 1332 | goto drop; |
| 1333 | } |
| 1334 | } |
| 1335 | |
| 1336 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { |
| 1337 | netif_dbg(dev, tx_err, dev->net, "no urb\n"); |
| 1338 | goto drop; |
| 1339 | } |
| 1340 | |
| 1341 | entry = (struct skb_data *) skb->cb; |
| 1342 | entry->urb = urb; |
| 1343 | entry->dev = dev; |
| 1344 | |
| 1345 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
| 1346 | skb->data, skb->len, tx_complete, skb); |
| 1347 | if (dev->can_dma_sg) { |
| 1348 | if (build_dma_sg(skb, urb) < 0) |
| 1349 | goto drop; |
| 1350 | } |
| 1351 | length = urb->transfer_buffer_length; |
| 1352 | |
| 1353 | /* don't assume the hardware handles USB_ZERO_PACKET |
| 1354 | * NOTE: strictly conforming cdc-ether devices should expect |
| 1355 | * the ZLP here, but ignore the one-byte packet. |
| 1356 | * NOTE2: CDC NCM specification is different from CDC ECM when |
| 1357 | * handling ZLP/short packets, so cdc_ncm driver will make short |
| 1358 | * packet itself if needed. |
| 1359 | */ |
| 1360 | if (length % dev->maxpacket == 0) { |
| 1361 | if (!(info->flags & FLAG_SEND_ZLP)) { |
| 1362 | if (!(info->flags & FLAG_MULTI_PACKET)) { |
| 1363 | length++; |
| 1364 | if (skb_tailroom(skb) && !urb->num_sgs) { |
| 1365 | skb->data[skb->len] = 0; |
| 1366 | __skb_put(skb, 1); |
| 1367 | } else if (urb->num_sgs) |
| 1368 | sg_set_buf(&urb->sg[urb->num_sgs++], |
| 1369 | dev->padding_pkt, 1); |
| 1370 | } |
| 1371 | } else |
| 1372 | urb->transfer_flags |= URB_ZERO_PACKET; |
| 1373 | } |
| 1374 | urb->transfer_buffer_length = length; |
| 1375 | |
| 1376 | if (info->flags & FLAG_MULTI_PACKET) { |
| 1377 | /* Driver has set number of packets and a length delta. |
| 1378 | * Calculate the complete length and ensure that it's |
| 1379 | * positive. |
| 1380 | */ |
| 1381 | entry->length += length; |
| 1382 | if (WARN_ON_ONCE(entry->length <= 0)) |
| 1383 | entry->length = length; |
| 1384 | } else { |
| 1385 | usbnet_set_skb_tx_stats(skb, 1, length); |
| 1386 | } |
| 1387 | |
| 1388 | spin_lock_irqsave(&dev->txq.lock, flags); |
| 1389 | retval = usb_autopm_get_interface_async(dev->intf); |
| 1390 | if (retval < 0) { |
| 1391 | spin_unlock_irqrestore(&dev->txq.lock, flags); |
| 1392 | goto drop; |
| 1393 | } |
| 1394 | |
| 1395 | #ifdef CONFIG_PM |
| 1396 | /* if this triggers the device is still a sleep */ |
| 1397 | if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { |
| 1398 | /* transmission will be done in resume */ |
| 1399 | usb_anchor_urb(urb, &dev->deferred); |
| 1400 | /* no use to process more packets */ |
| 1401 | netif_stop_queue(net); |
| 1402 | usb_put_urb(urb); |
| 1403 | spin_unlock_irqrestore(&dev->txq.lock, flags); |
| 1404 | netdev_dbg(dev->net, "Delaying transmission for resumption\n"); |
| 1405 | goto deferred; |
| 1406 | } |
| 1407 | #endif |
| 1408 | |
| 1409 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
| 1410 | case -EPIPE: |
| 1411 | netif_stop_queue (net); |
| 1412 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
| 1413 | usb_autopm_put_interface_async(dev->intf); |
| 1414 | break; |
| 1415 | default: |
| 1416 | usb_autopm_put_interface_async(dev->intf); |
| 1417 | netif_dbg(dev, tx_err, dev->net, |
| 1418 | "tx: submit urb err %d\n", retval); |
| 1419 | break; |
| 1420 | case 0: |
| 1421 | netif_trans_update(net); |
| 1422 | __usbnet_queue_skb(&dev->txq, skb, tx_start); |
| 1423 | if (dev->txq.qlen >= TX_QLEN (dev)) |
| 1424 | netif_stop_queue (net); |
| 1425 | } |
| 1426 | spin_unlock_irqrestore (&dev->txq.lock, flags); |
| 1427 | |
| 1428 | if (retval) { |
| 1429 | netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); |
| 1430 | drop: |
| 1431 | dev->net->stats.tx_dropped++; |
| 1432 | not_drop: |
| 1433 | if (skb) |
| 1434 | dev_kfree_skb_any (skb); |
| 1435 | if (urb) { |
| 1436 | kfree(urb->sg); |
| 1437 | usb_free_urb(urb); |
| 1438 | } |
| 1439 | } else |
| 1440 | netif_dbg(dev, tx_queued, dev->net, |
| 1441 | "> tx, len %u, type 0x%x\n", length, skb->protocol); |
| 1442 | #ifdef CONFIG_PM |
| 1443 | deferred: |
| 1444 | #endif |
| 1445 | return NETDEV_TX_OK; |
| 1446 | } |
| 1447 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); |
| 1448 | |
| 1449 | static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) |
| 1450 | { |
| 1451 | struct urb *urb; |
| 1452 | int i; |
| 1453 | int ret = 0; |
| 1454 | |
| 1455 | /* don't refill the queue all at once */ |
| 1456 | for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { |
| 1457 | urb = usb_alloc_urb(0, flags); |
| 1458 | if (urb != NULL) { |
| 1459 | ret = rx_submit(dev, urb, flags); |
| 1460 | if (ret) |
| 1461 | goto err; |
| 1462 | } else { |
| 1463 | ret = -ENOMEM; |
| 1464 | goto err; |
| 1465 | } |
| 1466 | } |
| 1467 | err: |
| 1468 | return ret; |
| 1469 | } |
| 1470 | |
| 1471 | /*-------------------------------------------------------------------------*/ |
| 1472 | |
| 1473 | // tasklet (work deferred from completions, in_irq) or timer |
| 1474 | |
| 1475 | static void usbnet_bh (unsigned long param) |
| 1476 | { |
| 1477 | struct usbnet *dev = (struct usbnet *) param; |
| 1478 | struct sk_buff *skb; |
| 1479 | struct skb_data *entry; |
| 1480 | |
| 1481 | while ((skb = skb_dequeue (&dev->done))) { |
| 1482 | entry = (struct skb_data *) skb->cb; |
| 1483 | switch (entry->state) { |
| 1484 | case rx_done: |
| 1485 | entry->state = rx_cleanup; |
| 1486 | rx_process (dev, skb); |
| 1487 | continue; |
| 1488 | case tx_done: |
| 1489 | kfree(entry->urb->sg); |
| 1490 | case rx_cleanup: |
| 1491 | usb_free_urb (entry->urb); |
| 1492 | dev_kfree_skb (skb); |
| 1493 | continue; |
| 1494 | default: |
| 1495 | netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); |
| 1496 | } |
| 1497 | } |
| 1498 | |
| 1499 | /* restart RX again after disabling due to high error rate */ |
| 1500 | clear_bit(EVENT_RX_KILL, &dev->flags); |
| 1501 | |
| 1502 | /* waiting for all pending urbs to complete? |
| 1503 | * only then can we forgo submitting anew |
| 1504 | */ |
| 1505 | if (waitqueue_active(&dev->wait)) { |
| 1506 | if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) |
| 1507 | wake_up_all(&dev->wait); |
| 1508 | |
| 1509 | // or are we maybe short a few urbs? |
| 1510 | } else if (netif_running (dev->net) && |
| 1511 | netif_device_present (dev->net) && |
| 1512 | netif_carrier_ok(dev->net) && |
| 1513 | !timer_pending(&dev->delay) && |
| 1514 | !test_bit(EVENT_RX_PAUSED, &dev->flags) && |
| 1515 | !test_bit(EVENT_RX_HALT, &dev->flags)) { |
| 1516 | int temp = dev->rxq.qlen; |
| 1517 | |
| 1518 | if (temp < RX_QLEN(dev)) { |
| 1519 | if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) |
| 1520 | return; |
| 1521 | if (temp != dev->rxq.qlen) |
| 1522 | netif_dbg(dev, link, dev->net, |
| 1523 | "rxqlen %d --> %d\n", |
| 1524 | temp, dev->rxq.qlen); |
| 1525 | if (dev->rxq.qlen < RX_QLEN(dev)) |
| 1526 | tasklet_schedule (&dev->bh); |
| 1527 | } |
| 1528 | if (dev->txq.qlen < TX_QLEN (dev)) |
| 1529 | netif_wake_queue (dev->net); |
| 1530 | } |
| 1531 | } |
| 1532 | |
| 1533 | |
| 1534 | /*------------------------------------------------------------------------- |
| 1535 | * |
| 1536 | * USB Device Driver support |
| 1537 | * |
| 1538 | *-------------------------------------------------------------------------*/ |
| 1539 | |
| 1540 | // precondition: never called in_interrupt |
| 1541 | |
| 1542 | void usbnet_disconnect (struct usb_interface *intf) |
| 1543 | { |
| 1544 | struct usbnet *dev; |
| 1545 | struct usb_device *xdev; |
| 1546 | struct net_device *net; |
| 1547 | |
| 1548 | dev = usb_get_intfdata(intf); |
| 1549 | usb_set_intfdata(intf, NULL); |
| 1550 | if (!dev) |
| 1551 | return; |
| 1552 | |
| 1553 | xdev = interface_to_usbdev (intf); |
| 1554 | |
| 1555 | netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", |
| 1556 | intf->dev.driver->name, |
| 1557 | xdev->bus->bus_name, xdev->devpath, |
| 1558 | dev->driver_info->description); |
| 1559 | |
| 1560 | net = dev->net; |
| 1561 | unregister_netdev (net); |
| 1562 | |
| 1563 | cancel_work_sync(&dev->kevent); |
| 1564 | |
| 1565 | usb_scuttle_anchored_urbs(&dev->deferred); |
| 1566 | |
| 1567 | if (dev->driver_info->unbind) |
| 1568 | dev->driver_info->unbind (dev, intf); |
| 1569 | |
| 1570 | usb_kill_urb(dev->interrupt); |
| 1571 | usb_free_urb(dev->interrupt); |
| 1572 | kfree(dev->padding_pkt); |
| 1573 | |
| 1574 | free_netdev(net); |
| 1575 | } |
| 1576 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
| 1577 | |
| 1578 | static const struct net_device_ops usbnet_netdev_ops = { |
| 1579 | .ndo_open = usbnet_open, |
| 1580 | .ndo_stop = usbnet_stop, |
| 1581 | .ndo_start_xmit = usbnet_start_xmit, |
| 1582 | .ndo_tx_timeout = usbnet_tx_timeout, |
| 1583 | .ndo_set_rx_mode = usbnet_set_rx_mode, |
| 1584 | .ndo_change_mtu = usbnet_change_mtu, |
| 1585 | .ndo_set_mac_address = eth_mac_addr, |
| 1586 | .ndo_validate_addr = eth_validate_addr, |
| 1587 | }; |
| 1588 | |
| 1589 | /*-------------------------------------------------------------------------*/ |
| 1590 | |
| 1591 | // precondition: never called in_interrupt |
| 1592 | |
| 1593 | static struct device_type wlan_type = { |
| 1594 | .name = "wlan", |
| 1595 | }; |
| 1596 | |
| 1597 | static struct device_type wwan_type = { |
| 1598 | .name = "wwan", |
| 1599 | }; |
| 1600 | |
| 1601 | int |
| 1602 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
| 1603 | { |
| 1604 | struct usbnet *dev; |
| 1605 | struct net_device *net; |
| 1606 | struct usb_host_interface *interface; |
| 1607 | struct driver_info *info; |
| 1608 | struct usb_device *xdev; |
| 1609 | int status; |
| 1610 | const char *name; |
| 1611 | struct usb_driver *driver = to_usb_driver(udev->dev.driver); |
| 1612 | |
| 1613 | /* usbnet already took usb runtime pm, so have to enable the feature |
| 1614 | * for usb interface, otherwise usb_autopm_get_interface may return |
| 1615 | * failure if RUNTIME_PM is enabled. |
| 1616 | */ |
| 1617 | if (!driver->supports_autosuspend) { |
| 1618 | driver->supports_autosuspend = 1; |
| 1619 | pm_runtime_enable(&udev->dev); |
| 1620 | } |
| 1621 | |
| 1622 | name = udev->dev.driver->name; |
| 1623 | info = (struct driver_info *) prod->driver_info; |
| 1624 | if (!info) { |
| 1625 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
| 1626 | return -ENODEV; |
| 1627 | } |
| 1628 | xdev = interface_to_usbdev (udev); |
| 1629 | interface = udev->cur_altsetting; |
| 1630 | |
| 1631 | status = -ENOMEM; |
| 1632 | |
| 1633 | // set up our own records |
| 1634 | net = alloc_etherdev(sizeof(*dev)); |
| 1635 | if (!net) |
| 1636 | goto out; |
| 1637 | |
| 1638 | /* netdev_printk() needs this so do it as early as possible */ |
| 1639 | SET_NETDEV_DEV(net, &udev->dev); |
| 1640 | |
| 1641 | dev = netdev_priv(net); |
| 1642 | dev->udev = xdev; |
| 1643 | dev->intf = udev; |
| 1644 | dev->driver_info = info; |
| 1645 | dev->driver_name = name; |
| 1646 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
| 1647 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); |
| 1648 | init_waitqueue_head(&dev->wait); |
| 1649 | skb_queue_head_init (&dev->rxq); |
| 1650 | skb_queue_head_init (&dev->txq); |
| 1651 | skb_queue_head_init (&dev->done); |
| 1652 | skb_queue_head_init(&dev->rxq_pause); |
| 1653 | dev->bh.func = usbnet_bh; |
| 1654 | dev->bh.data = (unsigned long) dev; |
| 1655 | INIT_WORK (&dev->kevent, usbnet_deferred_kevent); |
| 1656 | init_usb_anchor(&dev->deferred); |
| 1657 | dev->delay.function = usbnet_bh; |
| 1658 | dev->delay.data = (unsigned long) dev; |
| 1659 | init_timer (&dev->delay); |
| 1660 | mutex_init (&dev->phy_mutex); |
| 1661 | mutex_init(&dev->interrupt_mutex); |
| 1662 | dev->interrupt_count = 0; |
| 1663 | |
| 1664 | dev->net = net; |
| 1665 | strcpy (net->name, "usb%d"); |
| 1666 | memcpy (net->dev_addr, node_id, sizeof node_id); |
| 1667 | |
| 1668 | /* rx and tx sides can use different message sizes; |
| 1669 | * bind() should set rx_urb_size in that case. |
| 1670 | */ |
| 1671 | dev->hard_mtu = net->mtu + net->hard_header_len; |
| 1672 | |
| 1673 | net->netdev_ops = &usbnet_netdev_ops; |
| 1674 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; |
| 1675 | net->ethtool_ops = &usbnet_ethtool_ops; |
| 1676 | |
| 1677 | // allow device-specific bind/init procedures |
| 1678 | // NOTE net->name still not usable ... |
| 1679 | if (info->bind) { |
| 1680 | status = info->bind (dev, udev); |
| 1681 | if (status < 0) |
| 1682 | goto out1; |
| 1683 | |
| 1684 | // heuristic: "usb%d" for links we know are two-host, |
| 1685 | // else "eth%d" when there's reasonable doubt. userspace |
| 1686 | // can rename the link if it knows better. |
| 1687 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 && |
| 1688 | ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || |
| 1689 | (net->dev_addr [0] & 0x02) == 0)) |
| 1690 | strcpy (net->name, "eth%d"); |
| 1691 | /* WLAN devices should always be named "wlan%d" */ |
| 1692 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) |
| 1693 | strcpy(net->name, "wlan%d"); |
| 1694 | /* WWAN devices should always be named "wwan%d" */ |
| 1695 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) |
| 1696 | strcpy(net->name, "wwan%d"); |
| 1697 | |
| 1698 | /* devices that cannot do ARP */ |
| 1699 | if ((dev->driver_info->flags & FLAG_NOARP) != 0) |
| 1700 | net->flags |= IFF_NOARP; |
| 1701 | |
| 1702 | /* maybe the remote can't receive an Ethernet MTU */ |
| 1703 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) |
| 1704 | net->mtu = dev->hard_mtu - net->hard_header_len; |
| 1705 | } else if (!info->in || !info->out) |
| 1706 | status = usbnet_get_endpoints (dev, udev); |
| 1707 | else { |
| 1708 | dev->in = usb_rcvbulkpipe (xdev, info->in); |
| 1709 | dev->out = usb_sndbulkpipe (xdev, info->out); |
| 1710 | if (!(info->flags & FLAG_NO_SETINT)) |
| 1711 | status = usb_set_interface (xdev, |
| 1712 | interface->desc.bInterfaceNumber, |
| 1713 | interface->desc.bAlternateSetting); |
| 1714 | else |
| 1715 | status = 0; |
| 1716 | |
| 1717 | } |
| 1718 | if (status >= 0 && dev->status) |
| 1719 | status = init_status (dev, udev); |
| 1720 | if (status < 0) |
| 1721 | goto out3; |
| 1722 | |
| 1723 | if (!dev->rx_urb_size) |
| 1724 | dev->rx_urb_size = dev->hard_mtu; |
| 1725 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
| 1726 | |
| 1727 | /* let userspace know we have a random address */ |
| 1728 | if (ether_addr_equal(net->dev_addr, node_id)) |
| 1729 | net->addr_assign_type = NET_ADDR_RANDOM; |
| 1730 | |
| 1731 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) |
| 1732 | SET_NETDEV_DEVTYPE(net, &wlan_type); |
| 1733 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) |
| 1734 | SET_NETDEV_DEVTYPE(net, &wwan_type); |
| 1735 | |
| 1736 | /* initialize max rx_qlen and tx_qlen */ |
| 1737 | usbnet_update_max_qlen(dev); |
| 1738 | |
| 1739 | if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && |
| 1740 | !(info->flags & FLAG_MULTI_PACKET)) { |
| 1741 | dev->padding_pkt = kzalloc(1, GFP_KERNEL); |
| 1742 | if (!dev->padding_pkt) { |
| 1743 | status = -ENOMEM; |
| 1744 | goto out4; |
| 1745 | } |
| 1746 | } |
| 1747 | |
| 1748 | status = register_netdev (net); |
| 1749 | if (status) |
| 1750 | goto out5; |
| 1751 | netif_info(dev, probe, dev->net, |
| 1752 | "register '%s' at usb-%s-%s, %s, %pM\n", |
| 1753 | udev->dev.driver->name, |
| 1754 | xdev->bus->bus_name, xdev->devpath, |
| 1755 | dev->driver_info->description, |
| 1756 | net->dev_addr); |
| 1757 | |
| 1758 | // ok, it's ready to go. |
| 1759 | usb_set_intfdata (udev, dev); |
| 1760 | |
| 1761 | netif_device_attach (net); |
| 1762 | |
| 1763 | if (dev->driver_info->flags & FLAG_LINK_INTR) |
| 1764 | usbnet_link_change(dev, 0, 0); |
| 1765 | |
| 1766 | return 0; |
| 1767 | |
| 1768 | out5: |
| 1769 | kfree(dev->padding_pkt); |
| 1770 | out4: |
| 1771 | usb_free_urb(dev->interrupt); |
| 1772 | out3: |
| 1773 | if (info->unbind) |
| 1774 | info->unbind (dev, udev); |
| 1775 | out1: |
| 1776 | /* subdrivers must undo all they did in bind() if they |
| 1777 | * fail it, but we may fail later and a deferred kevent |
| 1778 | * may trigger an error resubmitting itself and, worse, |
| 1779 | * schedule a timer. So we kill it all just in case. |
| 1780 | */ |
| 1781 | cancel_work_sync(&dev->kevent); |
| 1782 | del_timer_sync(&dev->delay); |
| 1783 | free_netdev(net); |
| 1784 | out: |
| 1785 | return status; |
| 1786 | } |
| 1787 | EXPORT_SYMBOL_GPL(usbnet_probe); |
| 1788 | |
| 1789 | /*-------------------------------------------------------------------------*/ |
| 1790 | |
| 1791 | /* |
| 1792 | * suspend the whole driver as soon as the first interface is suspended |
| 1793 | * resume only when the last interface is resumed |
| 1794 | */ |
| 1795 | |
| 1796 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
| 1797 | { |
| 1798 | struct usbnet *dev = usb_get_intfdata(intf); |
| 1799 | |
| 1800 | if (!dev->suspend_count++) { |
| 1801 | spin_lock_irq(&dev->txq.lock); |
| 1802 | /* don't autosuspend while transmitting */ |
| 1803 | if (dev->txq.qlen && PMSG_IS_AUTO(message)) { |
| 1804 | dev->suspend_count--; |
| 1805 | spin_unlock_irq(&dev->txq.lock); |
| 1806 | return -EBUSY; |
| 1807 | } else { |
| 1808 | set_bit(EVENT_DEV_ASLEEP, &dev->flags); |
| 1809 | spin_unlock_irq(&dev->txq.lock); |
| 1810 | } |
| 1811 | /* |
| 1812 | * accelerate emptying of the rx and queues, to avoid |
| 1813 | * having everything error out. |
| 1814 | */ |
| 1815 | netif_device_detach (dev->net); |
| 1816 | usbnet_terminate_urbs(dev); |
| 1817 | __usbnet_status_stop_force(dev); |
| 1818 | |
| 1819 | /* |
| 1820 | * reattach so runtime management can use and |
| 1821 | * wake the device |
| 1822 | */ |
| 1823 | netif_device_attach (dev->net); |
| 1824 | } |
| 1825 | return 0; |
| 1826 | } |
| 1827 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
| 1828 | |
| 1829 | int usbnet_resume (struct usb_interface *intf) |
| 1830 | { |
| 1831 | struct usbnet *dev = usb_get_intfdata(intf); |
| 1832 | struct sk_buff *skb; |
| 1833 | struct urb *res; |
| 1834 | int retval; |
| 1835 | |
| 1836 | if (!--dev->suspend_count) { |
| 1837 | /* resume interrupt URB if it was previously submitted */ |
| 1838 | __usbnet_status_start_force(dev, GFP_NOIO); |
| 1839 | |
| 1840 | spin_lock_irq(&dev->txq.lock); |
| 1841 | while ((res = usb_get_from_anchor(&dev->deferred))) { |
| 1842 | |
| 1843 | skb = (struct sk_buff *)res->context; |
| 1844 | retval = usb_submit_urb(res, GFP_ATOMIC); |
| 1845 | if (retval < 0) { |
| 1846 | dev_kfree_skb_any(skb); |
| 1847 | kfree(res->sg); |
| 1848 | usb_free_urb(res); |
| 1849 | usb_autopm_put_interface_async(dev->intf); |
| 1850 | } else { |
| 1851 | netif_trans_update(dev->net); |
| 1852 | __skb_queue_tail(&dev->txq, skb); |
| 1853 | } |
| 1854 | } |
| 1855 | |
| 1856 | smp_mb(); |
| 1857 | clear_bit(EVENT_DEV_ASLEEP, &dev->flags); |
| 1858 | spin_unlock_irq(&dev->txq.lock); |
| 1859 | |
| 1860 | if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { |
| 1861 | /* handle remote wakeup ASAP |
| 1862 | * we cannot race against stop |
| 1863 | */ |
| 1864 | if (netif_device_present(dev->net) && |
| 1865 | !timer_pending(&dev->delay) && |
| 1866 | !test_bit(EVENT_RX_HALT, &dev->flags)) |
| 1867 | rx_alloc_submit(dev, GFP_NOIO); |
| 1868 | |
| 1869 | if (!(dev->txq.qlen >= TX_QLEN(dev))) |
| 1870 | netif_tx_wake_all_queues(dev->net); |
| 1871 | tasklet_schedule (&dev->bh); |
| 1872 | } |
| 1873 | } |
| 1874 | |
| 1875 | if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) |
| 1876 | usb_autopm_get_interface_no_resume(intf); |
| 1877 | |
| 1878 | return 0; |
| 1879 | } |
| 1880 | EXPORT_SYMBOL_GPL(usbnet_resume); |
| 1881 | |
| 1882 | /* |
| 1883 | * Either a subdriver implements manage_power, then it is assumed to always |
| 1884 | * be ready to be suspended or it reports the readiness to be suspended |
| 1885 | * explicitly |
| 1886 | */ |
| 1887 | void usbnet_device_suggests_idle(struct usbnet *dev) |
| 1888 | { |
| 1889 | if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { |
| 1890 | dev->intf->needs_remote_wakeup = 1; |
| 1891 | usb_autopm_put_interface_async(dev->intf); |
| 1892 | } |
| 1893 | } |
| 1894 | EXPORT_SYMBOL(usbnet_device_suggests_idle); |
| 1895 | |
| 1896 | /* |
| 1897 | * For devices that can do without special commands |
| 1898 | */ |
| 1899 | int usbnet_manage_power(struct usbnet *dev, int on) |
| 1900 | { |
| 1901 | dev->intf->needs_remote_wakeup = on; |
| 1902 | return 0; |
| 1903 | } |
| 1904 | EXPORT_SYMBOL(usbnet_manage_power); |
| 1905 | |
| 1906 | void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) |
| 1907 | { |
| 1908 | /* update link after link is reseted */ |
| 1909 | if (link && !need_reset) |
| 1910 | netif_carrier_on(dev->net); |
| 1911 | else |
| 1912 | netif_carrier_off(dev->net); |
| 1913 | |
| 1914 | if (need_reset && link) |
| 1915 | usbnet_defer_kevent(dev, EVENT_LINK_RESET); |
| 1916 | else |
| 1917 | usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); |
| 1918 | } |
| 1919 | EXPORT_SYMBOL(usbnet_link_change); |
| 1920 | |
| 1921 | /*-------------------------------------------------------------------------*/ |
| 1922 | static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 1923 | u16 value, u16 index, void *data, u16 size) |
| 1924 | { |
| 1925 | void *buf = NULL; |
| 1926 | int err = -ENOMEM; |
| 1927 | |
| 1928 | netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" |
| 1929 | " value=0x%04x index=0x%04x size=%d\n", |
| 1930 | cmd, reqtype, value, index, size); |
| 1931 | |
| 1932 | if (data) { |
| 1933 | buf = kmalloc(size, GFP_KERNEL); |
| 1934 | if (!buf) |
| 1935 | goto out; |
| 1936 | } |
| 1937 | |
| 1938 | err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), |
| 1939 | cmd, reqtype, value, index, buf, size, |
| 1940 | USB_CTRL_GET_TIMEOUT); |
| 1941 | if (err > 0 && err <= size) |
| 1942 | memcpy(data, buf, err); |
| 1943 | kfree(buf); |
| 1944 | out: |
| 1945 | return err; |
| 1946 | } |
| 1947 | |
| 1948 | static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 1949 | u16 value, u16 index, const void *data, |
| 1950 | u16 size) |
| 1951 | { |
| 1952 | void *buf = NULL; |
| 1953 | int err = -ENOMEM; |
| 1954 | |
| 1955 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" |
| 1956 | " value=0x%04x index=0x%04x size=%d\n", |
| 1957 | cmd, reqtype, value, index, size); |
| 1958 | |
| 1959 | if (data) { |
| 1960 | buf = kmemdup(data, size, GFP_KERNEL); |
| 1961 | if (!buf) |
| 1962 | goto out; |
| 1963 | } |
| 1964 | |
| 1965 | err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), |
| 1966 | cmd, reqtype, value, index, buf, size, |
| 1967 | USB_CTRL_SET_TIMEOUT); |
| 1968 | kfree(buf); |
| 1969 | |
| 1970 | out: |
| 1971 | return err; |
| 1972 | } |
| 1973 | |
| 1974 | /* |
| 1975 | * The function can't be called inside suspend/resume callback, |
| 1976 | * otherwise deadlock will be caused. |
| 1977 | */ |
| 1978 | int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 1979 | u16 value, u16 index, void *data, u16 size) |
| 1980 | { |
| 1981 | int ret; |
| 1982 | |
| 1983 | if (usb_autopm_get_interface(dev->intf) < 0) |
| 1984 | return -ENODEV; |
| 1985 | ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, |
| 1986 | data, size); |
| 1987 | usb_autopm_put_interface(dev->intf); |
| 1988 | return ret; |
| 1989 | } |
| 1990 | EXPORT_SYMBOL_GPL(usbnet_read_cmd); |
| 1991 | |
| 1992 | /* |
| 1993 | * The function can't be called inside suspend/resume callback, |
| 1994 | * otherwise deadlock will be caused. |
| 1995 | */ |
| 1996 | int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 1997 | u16 value, u16 index, const void *data, u16 size) |
| 1998 | { |
| 1999 | int ret; |
| 2000 | |
| 2001 | if (usb_autopm_get_interface(dev->intf) < 0) |
| 2002 | return -ENODEV; |
| 2003 | ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, |
| 2004 | data, size); |
| 2005 | usb_autopm_put_interface(dev->intf); |
| 2006 | return ret; |
| 2007 | } |
| 2008 | EXPORT_SYMBOL_GPL(usbnet_write_cmd); |
| 2009 | |
| 2010 | /* |
| 2011 | * The function can be called inside suspend/resume callback safely |
| 2012 | * and should only be called by suspend/resume callback generally. |
| 2013 | */ |
| 2014 | int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 2015 | u16 value, u16 index, void *data, u16 size) |
| 2016 | { |
| 2017 | return __usbnet_read_cmd(dev, cmd, reqtype, value, index, |
| 2018 | data, size); |
| 2019 | } |
| 2020 | EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); |
| 2021 | |
| 2022 | /* |
| 2023 | * The function can be called inside suspend/resume callback safely |
| 2024 | * and should only be called by suspend/resume callback generally. |
| 2025 | */ |
| 2026 | int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 2027 | u16 value, u16 index, const void *data, |
| 2028 | u16 size) |
| 2029 | { |
| 2030 | return __usbnet_write_cmd(dev, cmd, reqtype, value, index, |
| 2031 | data, size); |
| 2032 | } |
| 2033 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); |
| 2034 | |
| 2035 | static void usbnet_async_cmd_cb(struct urb *urb) |
| 2036 | { |
| 2037 | struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; |
| 2038 | int status = urb->status; |
| 2039 | |
| 2040 | if (status < 0) |
| 2041 | dev_dbg(&urb->dev->dev, "%s failed with %d", |
| 2042 | __func__, status); |
| 2043 | |
| 2044 | kfree(req); |
| 2045 | usb_free_urb(urb); |
| 2046 | } |
| 2047 | |
| 2048 | /* |
| 2049 | * The caller must make sure that device can't be put into suspend |
| 2050 | * state until the control URB completes. |
| 2051 | */ |
| 2052 | int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, |
| 2053 | u16 value, u16 index, const void *data, u16 size) |
| 2054 | { |
| 2055 | struct usb_ctrlrequest *req = NULL; |
| 2056 | struct urb *urb; |
| 2057 | int err = -ENOMEM; |
| 2058 | void *buf = NULL; |
| 2059 | |
| 2060 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" |
| 2061 | " value=0x%04x index=0x%04x size=%d\n", |
| 2062 | cmd, reqtype, value, index, size); |
| 2063 | |
| 2064 | urb = usb_alloc_urb(0, GFP_ATOMIC); |
| 2065 | if (!urb) { |
| 2066 | netdev_err(dev->net, "Error allocating URB in" |
| 2067 | " %s!\n", __func__); |
| 2068 | goto fail; |
| 2069 | } |
| 2070 | |
| 2071 | if (data) { |
| 2072 | buf = kmemdup(data, size, GFP_ATOMIC); |
| 2073 | if (!buf) { |
| 2074 | netdev_err(dev->net, "Error allocating buffer" |
| 2075 | " in %s!\n", __func__); |
| 2076 | goto fail_free; |
| 2077 | } |
| 2078 | } |
| 2079 | |
| 2080 | req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); |
| 2081 | if (!req) |
| 2082 | goto fail_free_buf; |
| 2083 | |
| 2084 | req->bRequestType = reqtype; |
| 2085 | req->bRequest = cmd; |
| 2086 | req->wValue = cpu_to_le16(value); |
| 2087 | req->wIndex = cpu_to_le16(index); |
| 2088 | req->wLength = cpu_to_le16(size); |
| 2089 | |
| 2090 | usb_fill_control_urb(urb, dev->udev, |
| 2091 | usb_sndctrlpipe(dev->udev, 0), |
| 2092 | (void *)req, buf, size, |
| 2093 | usbnet_async_cmd_cb, req); |
| 2094 | urb->transfer_flags |= URB_FREE_BUFFER; |
| 2095 | |
| 2096 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 2097 | if (err < 0) { |
| 2098 | netdev_err(dev->net, "Error submitting the control" |
| 2099 | " message: status=%d\n", err); |
| 2100 | goto fail_free; |
| 2101 | } |
| 2102 | return 0; |
| 2103 | |
| 2104 | fail_free_buf: |
| 2105 | kfree(buf); |
| 2106 | fail_free: |
| 2107 | kfree(req); |
| 2108 | usb_free_urb(urb); |
| 2109 | fail: |
| 2110 | return err; |
| 2111 | |
| 2112 | } |
| 2113 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); |
| 2114 | /*-------------------------------------------------------------------------*/ |
| 2115 | |
| 2116 | static int __init usbnet_init(void) |
| 2117 | { |
| 2118 | /* Compiler should optimize this out. */ |
| 2119 | BUILD_BUG_ON( |
| 2120 | FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); |
| 2121 | |
| 2122 | eth_random_addr(node_id); |
| 2123 | return 0; |
| 2124 | } |
| 2125 | module_init(usbnet_init); |
| 2126 | |
| 2127 | static void __exit usbnet_exit(void) |
| 2128 | { |
| 2129 | } |
| 2130 | module_exit(usbnet_exit); |
| 2131 | |
| 2132 | MODULE_AUTHOR("David Brownell"); |
| 2133 | MODULE_DESCRIPTION("USB network driver framework"); |
| 2134 | MODULE_LICENSE("GPL"); |