Commit | Line | Data |
---|---|---|
2b3d942c DB |
1 | /* |
2 | * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack | |
3 | * | |
4 | * Copyright (C) 2003-2005,2008 David Brownell | |
5 | * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger | |
6 | * Copyright (C) 2008 Nokia Corporation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
2b3d942c DB |
12 | */ |
13 | ||
14 | /* #define VERBOSE_DEBUG */ | |
15 | ||
16 | #include <linux/kernel.h> | |
9830317a | 17 | #include <linux/module.h> |
5a0e3ad6 | 18 | #include <linux/gfp.h> |
2b3d942c DB |
19 | #include <linux/device.h> |
20 | #include <linux/ctype.h> | |
21 | #include <linux/etherdevice.h> | |
22 | #include <linux/ethtool.h> | |
4fe5f079 | 23 | #include <linux/if_vlan.h> |
2b3d942c DB |
24 | |
25 | #include "u_ether.h" | |
26 | ||
27 | ||
28 | /* | |
29 | * This component encapsulates the Ethernet link glue needed to provide | |
30 | * one (!) network link through the USB gadget stack, normally "usb0". | |
31 | * | |
32 | * The control and data models are handled by the function driver which | |
9b39e9dd BN |
33 | * connects to this code; such as CDC Ethernet (ECM or EEM), |
34 | * "CDC Subset", or RNDIS. That includes all descriptor and endpoint | |
35 | * management. | |
2b3d942c DB |
36 | * |
37 | * Link level addressing is handled by this component using module | |
38 | * parameters; if no such parameters are provided, random link level | |
39 | * addresses are used. Each end of the link uses one address. The | |
40 | * host end address is exported in various ways, and is often recorded | |
41 | * in configuration databases. | |
42 | * | |
43 | * The driver which assembles each configuration using such a link is | |
44 | * responsible for ensuring that each configuration includes at most one | |
45 | * instance of is network link. (The network layer provides ways for | |
46 | * this single "physical" link to be used by multiple virtual links.) | |
47 | */ | |
48 | ||
8a1ce2c0 | 49 | #define UETH__VERSION "29-May-2008" |
2b3d942c | 50 | |
bba787a8 ML |
51 | /* Experiments show that both Linux and Windows hosts allow up to 16k |
52 | * frame sizes. Set the max size to 15k+52 to prevent allocating 32k | |
53 | * blocks and still have efficient handling. */ | |
54 | #define GETHER_MAX_ETH_FRAME_LEN 15412 | |
55 | ||
2b3d942c DB |
56 | struct eth_dev { |
57 | /* lock is held while accessing port_usb | |
2b3d942c DB |
58 | */ |
59 | spinlock_t lock; | |
60 | struct gether *port_usb; | |
61 | ||
62 | struct net_device *net; | |
63 | struct usb_gadget *gadget; | |
64 | ||
65 | spinlock_t req_lock; /* guard {rx,tx}_reqs */ | |
66 | struct list_head tx_reqs, rx_reqs; | |
67 | atomic_t tx_qlen; | |
68 | ||
9b39e9dd BN |
69 | struct sk_buff_head rx_frames; |
70 | ||
f1a1823f AP |
71 | unsigned qmult; |
72 | ||
2b3d942c | 73 | unsigned header_len; |
9b39e9dd BN |
74 | struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb); |
75 | int (*unwrap)(struct gether *, | |
76 | struct sk_buff *skb, | |
77 | struct sk_buff_head *list); | |
2b3d942c DB |
78 | |
79 | struct work_struct work; | |
80 | ||
81 | unsigned long todo; | |
82 | #define WORK_RX_MEMORY 0 | |
83 | ||
84 | bool zlp; | |
85 | u8 host_mac[ETH_ALEN]; | |
bcd4a1c4 | 86 | u8 dev_mac[ETH_ALEN]; |
2b3d942c DB |
87 | }; |
88 | ||
89 | /*-------------------------------------------------------------------------*/ | |
90 | ||
91 | #define RX_EXTRA 20 /* bytes guarding against rx overflows */ | |
92 | ||
93 | #define DEFAULT_QLEN 2 /* double buffering by default */ | |
94 | ||
04617db7 | 95 | /* for dual-speed hardware, use deeper queues at high/super speed */ |
f1a1823f | 96 | static inline int qlen(struct usb_gadget *gadget, unsigned qmult) |
2b3d942c | 97 | { |
04617db7 PZ |
98 | if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH || |
99 | gadget->speed == USB_SPEED_SUPER)) | |
2b3d942c DB |
100 | return qmult * DEFAULT_QLEN; |
101 | else | |
102 | return DEFAULT_QLEN; | |
103 | } | |
104 | ||
105 | /*-------------------------------------------------------------------------*/ | |
106 | ||
107 | /* REVISIT there must be a better way than having two sets | |
108 | * of debug calls ... | |
109 | */ | |
110 | ||
111 | #undef DBG | |
112 | #undef VDBG | |
113 | #undef ERROR | |
2b3d942c DB |
114 | #undef INFO |
115 | ||
116 | #define xprintk(d, level, fmt, args...) \ | |
117 | printk(level "%s: " fmt , (d)->net->name , ## args) | |
118 | ||
119 | #ifdef DEBUG | |
120 | #undef DEBUG | |
121 | #define DBG(dev, fmt, args...) \ | |
122 | xprintk(dev , KERN_DEBUG , fmt , ## args) | |
123 | #else | |
124 | #define DBG(dev, fmt, args...) \ | |
125 | do { } while (0) | |
126 | #endif /* DEBUG */ | |
127 | ||
128 | #ifdef VERBOSE_DEBUG | |
129 | #define VDBG DBG | |
130 | #else | |
131 | #define VDBG(dev, fmt, args...) \ | |
132 | do { } while (0) | |
133 | #endif /* DEBUG */ | |
134 | ||
135 | #define ERROR(dev, fmt, args...) \ | |
136 | xprintk(dev , KERN_ERR , fmt , ## args) | |
2b3d942c DB |
137 | #define INFO(dev, fmt, args...) \ |
138 | xprintk(dev , KERN_INFO , fmt , ## args) | |
139 | ||
140 | /*-------------------------------------------------------------------------*/ | |
141 | ||
142 | /* NETWORK DRIVER HOOKUP (to the layer above this driver) */ | |
143 | ||
ccad637b | 144 | static int ueth_change_mtu(struct net_device *net, int new_mtu) |
2b3d942c | 145 | { |
ab738ff1 ML |
146 | if (new_mtu <= ETH_HLEN || new_mtu > GETHER_MAX_ETH_FRAME_LEN) |
147 | return -ERANGE; | |
148 | net->mtu = new_mtu; | |
2b3d942c | 149 | |
ab738ff1 | 150 | return 0; |
2b3d942c DB |
151 | } |
152 | ||
153 | static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p) | |
154 | { | |
7826d43f | 155 | struct eth_dev *dev = netdev_priv(net); |
2b3d942c | 156 | |
7826d43f JP |
157 | strlcpy(p->driver, "g_ether", sizeof(p->driver)); |
158 | strlcpy(p->version, UETH__VERSION, sizeof(p->version)); | |
159 | strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version)); | |
160 | strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info)); | |
2b3d942c DB |
161 | } |
162 | ||
2b3d942c DB |
163 | /* REVISIT can also support: |
164 | * - WOL (by tracking suspends and issuing remote wakeup) | |
165 | * - msglevel (implies updated messaging) | |
166 | * - ... probably more ethtool ops | |
167 | */ | |
168 | ||
0fc0b732 | 169 | static const struct ethtool_ops ops = { |
2b3d942c | 170 | .get_drvinfo = eth_get_drvinfo, |
237e75bf | 171 | .get_link = ethtool_op_get_link, |
2b3d942c DB |
172 | }; |
173 | ||
174 | static void defer_kevent(struct eth_dev *dev, int flag) | |
175 | { | |
176 | if (test_and_set_bit(flag, &dev->todo)) | |
177 | return; | |
178 | if (!schedule_work(&dev->work)) | |
179 | ERROR(dev, "kevent %d may have been dropped\n", flag); | |
180 | else | |
181 | DBG(dev, "kevent %d scheduled\n", flag); | |
182 | } | |
183 | ||
184 | static void rx_complete(struct usb_ep *ep, struct usb_request *req); | |
185 | ||
186 | static int | |
187 | rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) | |
188 | { | |
189 | struct sk_buff *skb; | |
190 | int retval = -ENOMEM; | |
191 | size_t size = 0; | |
192 | struct usb_ep *out; | |
193 | unsigned long flags; | |
194 | ||
195 | spin_lock_irqsave(&dev->lock, flags); | |
196 | if (dev->port_usb) | |
197 | out = dev->port_usb->out_ep; | |
198 | else | |
199 | out = NULL; | |
200 | spin_unlock_irqrestore(&dev->lock, flags); | |
201 | ||
202 | if (!out) | |
203 | return -ENOTCONN; | |
204 | ||
205 | ||
206 | /* Padding up to RX_EXTRA handles minor disagreements with host. | |
207 | * Normally we use the USB "terminate on short read" convention; | |
208 | * so allow up to (N*maxpacket), since that memory is normally | |
209 | * already allocated. Some hardware doesn't deal well with short | |
210 | * reads (e.g. DMA must be N*maxpacket), so for now don't trim a | |
211 | * byte off the end (to force hardware errors on overflow). | |
212 | * | |
213 | * RNDIS uses internal framing, and explicitly allows senders to | |
214 | * pad to end-of-packet. That's potentially nice for speed, but | |
215 | * means receivers can't recover lost synch on their own (because | |
216 | * new packets don't only start after a short RX). | |
217 | */ | |
218 | size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA; | |
219 | size += dev->port_usb->header_len; | |
220 | size += out->maxpacket - 1; | |
221 | size -= size % out->maxpacket; | |
222 | ||
5c1168db | 223 | if (dev->port_usb->is_fixed) |
45d1b7ae | 224 | size = max_t(size_t, size, dev->port_usb->fixed_out_len); |
5c1168db | 225 | |
2b3d942c DB |
226 | skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags); |
227 | if (skb == NULL) { | |
228 | DBG(dev, "no rx skb\n"); | |
229 | goto enomem; | |
230 | } | |
231 | ||
232 | /* Some platforms perform better when IP packets are aligned, | |
233 | * but on at least one, checksumming fails otherwise. Note: | |
234 | * RNDIS headers involve variable numbers of LE32 values. | |
235 | */ | |
236 | skb_reserve(skb, NET_IP_ALIGN); | |
237 | ||
238 | req->buf = skb->data; | |
239 | req->length = size; | |
240 | req->complete = rx_complete; | |
241 | req->context = skb; | |
242 | ||
243 | retval = usb_ep_queue(out, req, gfp_flags); | |
244 | if (retval == -ENOMEM) | |
245 | enomem: | |
246 | defer_kevent(dev, WORK_RX_MEMORY); | |
247 | if (retval) { | |
248 | DBG(dev, "rx submit --> %d\n", retval); | |
249 | if (skb) | |
250 | dev_kfree_skb_any(skb); | |
9189a330 FB |
251 | spin_lock_irqsave(&dev->req_lock, flags); |
252 | list_add(&req->list, &dev->rx_reqs); | |
253 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
2b3d942c DB |
254 | } |
255 | return retval; | |
256 | } | |
257 | ||
258 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
259 | { | |
9189a330 | 260 | struct sk_buff *skb = req->context, *skb2; |
2b3d942c DB |
261 | struct eth_dev *dev = ep->driver_data; |
262 | int status = req->status; | |
263 | ||
264 | switch (status) { | |
265 | ||
266 | /* normal completion */ | |
267 | case 0: | |
268 | skb_put(skb, req->actual); | |
2b3d942c | 269 | |
9b39e9dd BN |
270 | if (dev->unwrap) { |
271 | unsigned long flags; | |
2b3d942c | 272 | |
9b39e9dd BN |
273 | spin_lock_irqsave(&dev->lock, flags); |
274 | if (dev->port_usb) { | |
275 | status = dev->unwrap(dev->port_usb, | |
276 | skb, | |
277 | &dev->rx_frames); | |
278 | } else { | |
279 | dev_kfree_skb_any(skb); | |
280 | status = -ENOTCONN; | |
281 | } | |
282 | spin_unlock_irqrestore(&dev->lock, flags); | |
283 | } else { | |
284 | skb_queue_tail(&dev->rx_frames, skb); | |
285 | } | |
9189a330 FB |
286 | skb = NULL; |
287 | ||
288 | skb2 = skb_dequeue(&dev->rx_frames); | |
289 | while (skb2) { | |
290 | if (status < 0 | |
291 | || ETH_HLEN > skb2->len | |
bba787a8 | 292 | || skb2->len > GETHER_MAX_ETH_FRAME_LEN) { |
9189a330 FB |
293 | dev->net->stats.rx_errors++; |
294 | dev->net->stats.rx_length_errors++; | |
295 | DBG(dev, "rx length %d\n", skb2->len); | |
296 | dev_kfree_skb_any(skb2); | |
297 | goto next_frame; | |
298 | } | |
299 | skb2->protocol = eth_type_trans(skb2, dev->net); | |
300 | dev->net->stats.rx_packets++; | |
301 | dev->net->stats.rx_bytes += skb2->len; | |
302 | ||
303 | /* no buffer copies needed, unless hardware can't | |
304 | * use skb buffers. | |
305 | */ | |
306 | status = netif_rx(skb2); | |
307 | next_frame: | |
308 | skb2 = skb_dequeue(&dev->rx_frames); | |
309 | } | |
2b3d942c DB |
310 | break; |
311 | ||
312 | /* software-driven interface shutdown */ | |
313 | case -ECONNRESET: /* unlink */ | |
314 | case -ESHUTDOWN: /* disconnect etc */ | |
315 | VDBG(dev, "rx shutdown, code %d\n", status); | |
316 | goto quiesce; | |
317 | ||
318 | /* for hardware automagic (such as pxa) */ | |
319 | case -ECONNABORTED: /* endpoint reset */ | |
320 | DBG(dev, "rx %s reset\n", ep->name); | |
321 | defer_kevent(dev, WORK_RX_MEMORY); | |
322 | quiesce: | |
323 | dev_kfree_skb_any(skb); | |
324 | goto clean; | |
325 | ||
326 | /* data overrun */ | |
327 | case -EOVERFLOW: | |
328 | dev->net->stats.rx_over_errors++; | |
329 | /* FALLTHROUGH */ | |
330 | ||
331 | default: | |
332 | dev->net->stats.rx_errors++; | |
333 | DBG(dev, "rx status %d\n", status); | |
334 | break; | |
335 | } | |
336 | ||
9189a330 FB |
337 | if (skb) |
338 | dev_kfree_skb_any(skb); | |
339 | if (!netif_running(dev->net)) { | |
2b3d942c DB |
340 | clean: |
341 | spin_lock(&dev->req_lock); | |
342 | list_add(&req->list, &dev->rx_reqs); | |
343 | spin_unlock(&dev->req_lock); | |
9189a330 FB |
344 | req = NULL; |
345 | } | |
346 | if (req) | |
347 | rx_submit(dev, req, GFP_ATOMIC); | |
2b3d942c DB |
348 | } |
349 | ||
350 | static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n) | |
351 | { | |
352 | unsigned i; | |
353 | struct usb_request *req; | |
354 | ||
355 | if (!n) | |
356 | return -ENOMEM; | |
357 | ||
358 | /* queue/recycle up to N requests */ | |
359 | i = n; | |
360 | list_for_each_entry(req, list, list) { | |
361 | if (i-- == 0) | |
362 | goto extra; | |
363 | } | |
364 | while (i--) { | |
365 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
366 | if (!req) | |
367 | return list_empty(list) ? -ENOMEM : 0; | |
368 | list_add(&req->list, list); | |
369 | } | |
370 | return 0; | |
371 | ||
372 | extra: | |
373 | /* free extras */ | |
374 | for (;;) { | |
375 | struct list_head *next; | |
376 | ||
377 | next = req->list.next; | |
378 | list_del(&req->list); | |
379 | usb_ep_free_request(ep, req); | |
380 | ||
381 | if (next == list) | |
382 | break; | |
383 | ||
384 | req = container_of(next, struct usb_request, list); | |
385 | } | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n) | |
390 | { | |
391 | int status; | |
392 | ||
393 | spin_lock(&dev->req_lock); | |
394 | status = prealloc(&dev->tx_reqs, link->in_ep, n); | |
395 | if (status < 0) | |
396 | goto fail; | |
397 | status = prealloc(&dev->rx_reqs, link->out_ep, n); | |
398 | if (status < 0) | |
399 | goto fail; | |
400 | goto done; | |
401 | fail: | |
402 | DBG(dev, "can't alloc requests\n"); | |
403 | done: | |
404 | spin_unlock(&dev->req_lock); | |
405 | return status; | |
406 | } | |
407 | ||
408 | static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags) | |
409 | { | |
410 | struct usb_request *req; | |
411 | unsigned long flags; | |
412 | ||
413 | /* fill unused rxq slots with some skb */ | |
414 | spin_lock_irqsave(&dev->req_lock, flags); | |
415 | while (!list_empty(&dev->rx_reqs)) { | |
416 | req = container_of(dev->rx_reqs.next, | |
417 | struct usb_request, list); | |
418 | list_del_init(&req->list); | |
419 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
420 | ||
421 | if (rx_submit(dev, req, gfp_flags) < 0) { | |
422 | defer_kevent(dev, WORK_RX_MEMORY); | |
423 | return; | |
424 | } | |
425 | ||
426 | spin_lock_irqsave(&dev->req_lock, flags); | |
427 | } | |
428 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
429 | } | |
430 | ||
431 | static void eth_work(struct work_struct *work) | |
432 | { | |
433 | struct eth_dev *dev = container_of(work, struct eth_dev, work); | |
434 | ||
435 | if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) { | |
436 | if (netif_running(dev->net)) | |
437 | rx_fill(dev, GFP_KERNEL); | |
438 | } | |
439 | ||
440 | if (dev->todo) | |
441 | DBG(dev, "work done, flags = 0x%lx\n", dev->todo); | |
442 | } | |
443 | ||
444 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
445 | { | |
446 | struct sk_buff *skb = req->context; | |
447 | struct eth_dev *dev = ep->driver_data; | |
448 | ||
449 | switch (req->status) { | |
450 | default: | |
451 | dev->net->stats.tx_errors++; | |
452 | VDBG(dev, "tx err %d\n", req->status); | |
453 | /* FALLTHROUGH */ | |
454 | case -ECONNRESET: /* unlink */ | |
455 | case -ESHUTDOWN: /* disconnect etc */ | |
456 | break; | |
457 | case 0: | |
458 | dev->net->stats.tx_bytes += skb->len; | |
459 | } | |
460 | dev->net->stats.tx_packets++; | |
461 | ||
462 | spin_lock(&dev->req_lock); | |
463 | list_add(&req->list, &dev->tx_reqs); | |
464 | spin_unlock(&dev->req_lock); | |
465 | dev_kfree_skb_any(skb); | |
466 | ||
467 | atomic_dec(&dev->tx_qlen); | |
468 | if (netif_carrier_ok(dev->net)) | |
469 | netif_wake_queue(dev->net); | |
470 | } | |
471 | ||
472 | static inline int is_promisc(u16 cdc_filter) | |
473 | { | |
474 | return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS; | |
475 | } | |
476 | ||
25a79c41 SH |
477 | static netdev_tx_t eth_start_xmit(struct sk_buff *skb, |
478 | struct net_device *net) | |
2b3d942c DB |
479 | { |
480 | struct eth_dev *dev = netdev_priv(net); | |
6d3865f9 | 481 | int length = 0; |
2b3d942c DB |
482 | int retval; |
483 | struct usb_request *req = NULL; | |
484 | unsigned long flags; | |
485 | struct usb_ep *in; | |
486 | u16 cdc_filter; | |
487 | ||
488 | spin_lock_irqsave(&dev->lock, flags); | |
489 | if (dev->port_usb) { | |
490 | in = dev->port_usb->in_ep; | |
491 | cdc_filter = dev->port_usb->cdc_filter; | |
492 | } else { | |
493 | in = NULL; | |
494 | cdc_filter = 0; | |
495 | } | |
496 | spin_unlock_irqrestore(&dev->lock, flags); | |
497 | ||
6d3865f9 | 498 | if (skb && !in) { |
2b3d942c | 499 | dev_kfree_skb_any(skb); |
6ed10654 | 500 | return NETDEV_TX_OK; |
2b3d942c DB |
501 | } |
502 | ||
503 | /* apply outgoing CDC or RNDIS filters */ | |
6d3865f9 | 504 | if (skb && !is_promisc(cdc_filter)) { |
2b3d942c DB |
505 | u8 *dest = skb->data; |
506 | ||
507 | if (is_multicast_ether_addr(dest)) { | |
508 | u16 type; | |
509 | ||
510 | /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host | |
511 | * SET_ETHERNET_MULTICAST_FILTERS requests | |
512 | */ | |
513 | if (is_broadcast_ether_addr(dest)) | |
514 | type = USB_CDC_PACKET_TYPE_BROADCAST; | |
515 | else | |
516 | type = USB_CDC_PACKET_TYPE_ALL_MULTICAST; | |
517 | if (!(cdc_filter & type)) { | |
518 | dev_kfree_skb_any(skb); | |
6ed10654 | 519 | return NETDEV_TX_OK; |
2b3d942c DB |
520 | } |
521 | } | |
522 | /* ignores USB_CDC_PACKET_TYPE_DIRECTED */ | |
523 | } | |
524 | ||
525 | spin_lock_irqsave(&dev->req_lock, flags); | |
526 | /* | |
527 | * this freelist can be empty if an interrupt triggered disconnect() | |
528 | * and reconfigured the gadget (shutting down this queue) after the | |
529 | * network stack decided to xmit but before we got the spinlock. | |
530 | */ | |
531 | if (list_empty(&dev->tx_reqs)) { | |
532 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
5b548140 | 533 | return NETDEV_TX_BUSY; |
2b3d942c DB |
534 | } |
535 | ||
536 | req = container_of(dev->tx_reqs.next, struct usb_request, list); | |
537 | list_del(&req->list); | |
538 | ||
539 | /* temporarily stop TX queue when the freelist empties */ | |
540 | if (list_empty(&dev->tx_reqs)) | |
541 | netif_stop_queue(net); | |
542 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
543 | ||
544 | /* no buffer copies needed, unless the network stack did it | |
545 | * or the hardware can't use skb buffers. | |
546 | * or there's not enough space for extra headers we need | |
547 | */ | |
548 | if (dev->wrap) { | |
9b39e9dd | 549 | unsigned long flags; |
2b3d942c | 550 | |
9b39e9dd BN |
551 | spin_lock_irqsave(&dev->lock, flags); |
552 | if (dev->port_usb) | |
553 | skb = dev->wrap(dev->port_usb, skb); | |
554 | spin_unlock_irqrestore(&dev->lock, flags); | |
6d3865f9 JB |
555 | if (!skb) { |
556 | /* Multi frame CDC protocols may store the frame for | |
557 | * later which is not a dropped frame. | |
558 | */ | |
88c09eac PC |
559 | if (dev->port_usb && |
560 | dev->port_usb->supports_multi_frame) | |
6d3865f9 | 561 | goto multiframe; |
2b3d942c | 562 | goto drop; |
6d3865f9 | 563 | } |
2b3d942c | 564 | } |
6d3865f9 JB |
565 | |
566 | length = skb->len; | |
2b3d942c DB |
567 | req->buf = skb->data; |
568 | req->context = skb; | |
569 | req->complete = tx_complete; | |
570 | ||
5c1168db YK |
571 | /* NCM requires no zlp if transfer is dwNtbInMaxSize */ |
572 | if (dev->port_usb->is_fixed && | |
573 | length == dev->port_usb->fixed_in_len && | |
574 | (length % in->maxpacket) == 0) | |
575 | req->zero = 0; | |
576 | else | |
577 | req->zero = 1; | |
578 | ||
2b3d942c DB |
579 | /* use zlp framing on tx for strict CDC-Ether conformance, |
580 | * though any robust network rx path ignores extra padding. | |
581 | * and some hardware doesn't like to write zlps. | |
582 | */ | |
5c1168db | 583 | if (req->zero && !dev->zlp && (length % in->maxpacket) == 0) |
2b3d942c DB |
584 | length++; |
585 | ||
586 | req->length = length; | |
587 | ||
04617db7 | 588 | /* throttle high/super speed IRQ rate back slightly */ |
2b3d942c | 589 | if (gadget_is_dualspeed(dev->gadget)) |
04617db7 PZ |
590 | req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH || |
591 | dev->gadget->speed == USB_SPEED_SUPER) | |
f1a1823f | 592 | ? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0) |
2b3d942c DB |
593 | : 0; |
594 | ||
595 | retval = usb_ep_queue(in, req, GFP_ATOMIC); | |
596 | switch (retval) { | |
597 | default: | |
598 | DBG(dev, "tx queue err %d\n", retval); | |
599 | break; | |
600 | case 0: | |
860e9538 | 601 | netif_trans_update(net); |
2b3d942c DB |
602 | atomic_inc(&dev->tx_qlen); |
603 | } | |
604 | ||
605 | if (retval) { | |
9b39e9dd | 606 | dev_kfree_skb_any(skb); |
2b3d942c DB |
607 | drop: |
608 | dev->net->stats.tx_dropped++; | |
6d3865f9 | 609 | multiframe: |
2b3d942c DB |
610 | spin_lock_irqsave(&dev->req_lock, flags); |
611 | if (list_empty(&dev->tx_reqs)) | |
612 | netif_start_queue(net); | |
613 | list_add(&req->list, &dev->tx_reqs); | |
614 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
615 | } | |
6ed10654 | 616 | return NETDEV_TX_OK; |
2b3d942c DB |
617 | } |
618 | ||
619 | /*-------------------------------------------------------------------------*/ | |
620 | ||
621 | static void eth_start(struct eth_dev *dev, gfp_t gfp_flags) | |
622 | { | |
623 | DBG(dev, "%s\n", __func__); | |
624 | ||
625 | /* fill the rx queue */ | |
626 | rx_fill(dev, gfp_flags); | |
627 | ||
628 | /* and open the tx floodgates */ | |
629 | atomic_set(&dev->tx_qlen, 0); | |
630 | netif_wake_queue(dev->net); | |
631 | } | |
632 | ||
633 | static int eth_open(struct net_device *net) | |
634 | { | |
635 | struct eth_dev *dev = netdev_priv(net); | |
636 | struct gether *link; | |
637 | ||
638 | DBG(dev, "%s\n", __func__); | |
639 | if (netif_carrier_ok(dev->net)) | |
640 | eth_start(dev, GFP_KERNEL); | |
641 | ||
642 | spin_lock_irq(&dev->lock); | |
643 | link = dev->port_usb; | |
644 | if (link && link->open) | |
645 | link->open(link); | |
646 | spin_unlock_irq(&dev->lock); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static int eth_stop(struct net_device *net) | |
652 | { | |
653 | struct eth_dev *dev = netdev_priv(net); | |
654 | unsigned long flags; | |
655 | ||
656 | VDBG(dev, "%s\n", __func__); | |
657 | netif_stop_queue(net); | |
658 | ||
659 | DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", | |
660 | dev->net->stats.rx_packets, dev->net->stats.tx_packets, | |
661 | dev->net->stats.rx_errors, dev->net->stats.tx_errors | |
662 | ); | |
663 | ||
664 | /* ensure there are no more active requests */ | |
665 | spin_lock_irqsave(&dev->lock, flags); | |
666 | if (dev->port_usb) { | |
667 | struct gether *link = dev->port_usb; | |
b1b552a6 MG |
668 | const struct usb_endpoint_descriptor *in; |
669 | const struct usb_endpoint_descriptor *out; | |
2b3d942c DB |
670 | |
671 | if (link->close) | |
672 | link->close(link); | |
673 | ||
674 | /* NOTE: we have no abort-queue primitive we could use | |
675 | * to cancel all pending I/O. Instead, we disable then | |
676 | * reenable the endpoints ... this idiom may leave toggle | |
677 | * wrong, but that's a self-correcting error. | |
678 | * | |
679 | * REVISIT: we *COULD* just let the transfers complete at | |
680 | * their own pace; the network stack can handle old packets. | |
681 | * For the moment we leave this here, since it works. | |
682 | */ | |
b1b552a6 MG |
683 | in = link->in_ep->desc; |
684 | out = link->out_ep->desc; | |
2b3d942c DB |
685 | usb_ep_disable(link->in_ep); |
686 | usb_ep_disable(link->out_ep); | |
687 | if (netif_carrier_ok(net)) { | |
688 | DBG(dev, "host still using in/out endpoints\n"); | |
b1b552a6 MG |
689 | link->in_ep->desc = in; |
690 | link->out_ep->desc = out; | |
72c973dd TB |
691 | usb_ep_enable(link->in_ep); |
692 | usb_ep_enable(link->out_ep); | |
2b3d942c DB |
693 | } |
694 | } | |
695 | spin_unlock_irqrestore(&dev->lock, flags); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | /*-------------------------------------------------------------------------*/ | |
701 | ||
28824b18 | 702 | static int get_ether_addr(const char *str, u8 *dev_addr) |
2b3d942c DB |
703 | { |
704 | if (str) { | |
705 | unsigned i; | |
706 | ||
707 | for (i = 0; i < 6; i++) { | |
708 | unsigned char num; | |
709 | ||
710 | if ((*str == '.') || (*str == ':')) | |
711 | str++; | |
e644814a AS |
712 | num = hex_to_bin(*str++) << 4; |
713 | num |= hex_to_bin(*str++); | |
2b3d942c DB |
714 | dev_addr [i] = num; |
715 | } | |
716 | if (is_valid_ether_addr(dev_addr)) | |
717 | return 0; | |
718 | } | |
006c9139 | 719 | eth_random_addr(dev_addr); |
2b3d942c DB |
720 | return 1; |
721 | } | |
722 | ||
bcd4a1c4 AP |
723 | static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len) |
724 | { | |
725 | if (len < 18) | |
726 | return -EINVAL; | |
727 | ||
27f38705 | 728 | snprintf(str, len, "%pM", dev_addr); |
bcd4a1c4 AP |
729 | return 18; |
730 | } | |
731 | ||
5ec38f30 SH |
732 | static const struct net_device_ops eth_netdev_ops = { |
733 | .ndo_open = eth_open, | |
734 | .ndo_stop = eth_stop, | |
735 | .ndo_start_xmit = eth_start_xmit, | |
736 | .ndo_change_mtu = ueth_change_mtu, | |
737 | .ndo_set_mac_address = eth_mac_addr, | |
738 | .ndo_validate_addr = eth_validate_addr, | |
739 | }; | |
2b3d942c | 740 | |
aa790740 MH |
741 | static struct device_type gadget_type = { |
742 | .name = "gadget", | |
743 | }; | |
744 | ||
2b3d942c | 745 | /** |
036e98b2 | 746 | * gether_setup_name - initialize one ethernet-over-usb link |
2b3d942c DB |
747 | * @g: gadget to associated with these links |
748 | * @ethaddr: NULL, or a buffer in which the ethernet address of the | |
749 | * host side of the link is recorded | |
036e98b2 | 750 | * @netname: name for network device (for example, "usb") |
2b3d942c DB |
751 | * Context: may sleep |
752 | * | |
753 | * This sets up the single network link that may be exported by a | |
754 | * gadget driver using this framework. The link layer addresses are | |
755 | * set up using module parameters. | |
756 | * | |
574f24f7 | 757 | * Returns an eth_dev pointer on success, or an ERR_PTR on failure. |
2b3d942c | 758 | */ |
f1a1823f AP |
759 | struct eth_dev *gether_setup_name(struct usb_gadget *g, |
760 | const char *dev_addr, const char *host_addr, | |
761 | u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname) | |
2b3d942c DB |
762 | { |
763 | struct eth_dev *dev; | |
764 | struct net_device *net; | |
765 | int status; | |
766 | ||
2b3d942c DB |
767 | net = alloc_etherdev(sizeof *dev); |
768 | if (!net) | |
d6a01439 | 769 | return ERR_PTR(-ENOMEM); |
2b3d942c DB |
770 | |
771 | dev = netdev_priv(net); | |
772 | spin_lock_init(&dev->lock); | |
773 | spin_lock_init(&dev->req_lock); | |
774 | INIT_WORK(&dev->work, eth_work); | |
775 | INIT_LIST_HEAD(&dev->tx_reqs); | |
776 | INIT_LIST_HEAD(&dev->rx_reqs); | |
777 | ||
9b39e9dd BN |
778 | skb_queue_head_init(&dev->rx_frames); |
779 | ||
2b3d942c DB |
780 | /* network device setup */ |
781 | dev->net = net; | |
f1a1823f | 782 | dev->qmult = qmult; |
036e98b2 | 783 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
2b3d942c DB |
784 | |
785 | if (get_ether_addr(dev_addr, net->dev_addr)) | |
786 | dev_warn(&g->dev, | |
787 | "using random %s ethernet address\n", "self"); | |
788 | if (get_ether_addr(host_addr, dev->host_mac)) | |
789 | dev_warn(&g->dev, | |
790 | "using random %s ethernet address\n", "host"); | |
791 | ||
792 | if (ethaddr) | |
793 | memcpy(ethaddr, dev->host_mac, ETH_ALEN); | |
794 | ||
5ec38f30 SH |
795 | net->netdev_ops = ð_netdev_ops; |
796 | ||
7ad24ea4 | 797 | net->ethtool_ops = &ops; |
2b3d942c | 798 | |
2b3d942c DB |
799 | dev->gadget = g; |
800 | SET_NETDEV_DEV(net, &g->dev); | |
aa790740 | 801 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
2b3d942c DB |
802 | |
803 | status = register_netdev(net); | |
804 | if (status < 0) { | |
805 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); | |
806 | free_netdev(net); | |
d6a01439 | 807 | dev = ERR_PTR(status); |
2b3d942c | 808 | } else { |
e174961c JB |
809 | INFO(dev, "MAC %pM\n", net->dev_addr); |
810 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); | |
2b3d942c | 811 | |
bcd4a1c4 AP |
812 | /* |
813 | * two kinds of host-initiated state changes: | |
31bde1ce KC |
814 | * - iff DATA transfer is active, carrier is "on" |
815 | * - tx queueing enabled if open *and* carrier is "on" | |
816 | */ | |
817 | netif_carrier_off(net); | |
2b3d942c DB |
818 | } |
819 | ||
d6a01439 | 820 | return dev; |
2b3d942c | 821 | } |
0700faaf | 822 | EXPORT_SYMBOL_GPL(gether_setup_name); |
2b3d942c | 823 | |
bcd4a1c4 AP |
824 | struct net_device *gether_setup_name_default(const char *netname) |
825 | { | |
826 | struct net_device *net; | |
827 | struct eth_dev *dev; | |
828 | ||
829 | net = alloc_etherdev(sizeof(*dev)); | |
830 | if (!net) | |
831 | return ERR_PTR(-ENOMEM); | |
832 | ||
833 | dev = netdev_priv(net); | |
834 | spin_lock_init(&dev->lock); | |
835 | spin_lock_init(&dev->req_lock); | |
836 | INIT_WORK(&dev->work, eth_work); | |
837 | INIT_LIST_HEAD(&dev->tx_reqs); | |
838 | INIT_LIST_HEAD(&dev->rx_reqs); | |
839 | ||
840 | skb_queue_head_init(&dev->rx_frames); | |
841 | ||
842 | /* network device setup */ | |
843 | dev->net = net; | |
844 | dev->qmult = QMULT_DEFAULT; | |
845 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); | |
846 | ||
847 | eth_random_addr(dev->dev_mac); | |
848 | pr_warn("using random %s ethernet address\n", "self"); | |
849 | eth_random_addr(dev->host_mac); | |
850 | pr_warn("using random %s ethernet address\n", "host"); | |
851 | ||
852 | net->netdev_ops = ð_netdev_ops; | |
853 | ||
7ad24ea4 | 854 | net->ethtool_ops = &ops; |
bcd4a1c4 AP |
855 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
856 | ||
857 | return net; | |
858 | } | |
0700faaf | 859 | EXPORT_SYMBOL_GPL(gether_setup_name_default); |
bcd4a1c4 AP |
860 | |
861 | int gether_register_netdev(struct net_device *net) | |
862 | { | |
863 | struct eth_dev *dev; | |
864 | struct usb_gadget *g; | |
865 | struct sockaddr sa; | |
866 | int status; | |
867 | ||
868 | if (!net->dev.parent) | |
869 | return -EINVAL; | |
870 | dev = netdev_priv(net); | |
871 | g = dev->gadget; | |
872 | status = register_netdev(net); | |
873 | if (status < 0) { | |
874 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); | |
875 | return status; | |
876 | } else { | |
877 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); | |
878 | ||
879 | /* two kinds of host-initiated state changes: | |
880 | * - iff DATA transfer is active, carrier is "on" | |
881 | * - tx queueing enabled if open *and* carrier is "on" | |
882 | */ | |
883 | netif_carrier_off(net); | |
884 | } | |
885 | sa.sa_family = net->type; | |
886 | memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN); | |
887 | rtnl_lock(); | |
888 | status = dev_set_mac_address(net, &sa); | |
889 | rtnl_unlock(); | |
890 | if (status) | |
891 | pr_warn("cannot set self ethernet address: %d\n", status); | |
892 | else | |
893 | INFO(dev, "MAC %pM\n", dev->dev_mac); | |
894 | ||
895 | return status; | |
896 | } | |
0700faaf | 897 | EXPORT_SYMBOL_GPL(gether_register_netdev); |
bcd4a1c4 AP |
898 | |
899 | void gether_set_gadget(struct net_device *net, struct usb_gadget *g) | |
900 | { | |
901 | struct eth_dev *dev; | |
902 | ||
903 | dev = netdev_priv(net); | |
904 | dev->gadget = g; | |
905 | SET_NETDEV_DEV(net, &g->dev); | |
906 | } | |
0700faaf | 907 | EXPORT_SYMBOL_GPL(gether_set_gadget); |
bcd4a1c4 AP |
908 | |
909 | int gether_set_dev_addr(struct net_device *net, const char *dev_addr) | |
910 | { | |
911 | struct eth_dev *dev; | |
912 | u8 new_addr[ETH_ALEN]; | |
913 | ||
914 | dev = netdev_priv(net); | |
915 | if (get_ether_addr(dev_addr, new_addr)) | |
916 | return -EINVAL; | |
917 | memcpy(dev->dev_mac, new_addr, ETH_ALEN); | |
918 | return 0; | |
919 | } | |
0700faaf | 920 | EXPORT_SYMBOL_GPL(gether_set_dev_addr); |
bcd4a1c4 AP |
921 | |
922 | int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len) | |
923 | { | |
924 | struct eth_dev *dev; | |
925 | ||
926 | dev = netdev_priv(net); | |
927 | return get_ether_addr_str(dev->dev_mac, dev_addr, len); | |
928 | } | |
0700faaf | 929 | EXPORT_SYMBOL_GPL(gether_get_dev_addr); |
bcd4a1c4 AP |
930 | |
931 | int gether_set_host_addr(struct net_device *net, const char *host_addr) | |
932 | { | |
933 | struct eth_dev *dev; | |
934 | u8 new_addr[ETH_ALEN]; | |
935 | ||
936 | dev = netdev_priv(net); | |
937 | if (get_ether_addr(host_addr, new_addr)) | |
938 | return -EINVAL; | |
939 | memcpy(dev->host_mac, new_addr, ETH_ALEN); | |
940 | return 0; | |
941 | } | |
0700faaf | 942 | EXPORT_SYMBOL_GPL(gether_set_host_addr); |
bcd4a1c4 AP |
943 | |
944 | int gether_get_host_addr(struct net_device *net, char *host_addr, int len) | |
945 | { | |
946 | struct eth_dev *dev; | |
947 | ||
948 | dev = netdev_priv(net); | |
949 | return get_ether_addr_str(dev->host_mac, host_addr, len); | |
950 | } | |
0700faaf | 951 | EXPORT_SYMBOL_GPL(gether_get_host_addr); |
bcd4a1c4 AP |
952 | |
953 | int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len) | |
954 | { | |
955 | struct eth_dev *dev; | |
956 | ||
957 | if (len < 13) | |
958 | return -EINVAL; | |
959 | ||
960 | dev = netdev_priv(net); | |
961 | snprintf(host_addr, len, "%pm", dev->host_mac); | |
962 | ||
963 | return strlen(host_addr); | |
964 | } | |
0700faaf | 965 | EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc); |
bcd4a1c4 | 966 | |
bf4277c7 AP |
967 | void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]) |
968 | { | |
969 | struct eth_dev *dev; | |
970 | ||
971 | dev = netdev_priv(net); | |
972 | memcpy(host_mac, dev->host_mac, ETH_ALEN); | |
973 | } | |
0700faaf | 974 | EXPORT_SYMBOL_GPL(gether_get_host_addr_u8); |
bf4277c7 | 975 | |
bcd4a1c4 AP |
976 | void gether_set_qmult(struct net_device *net, unsigned qmult) |
977 | { | |
978 | struct eth_dev *dev; | |
979 | ||
980 | dev = netdev_priv(net); | |
981 | dev->qmult = qmult; | |
982 | } | |
0700faaf | 983 | EXPORT_SYMBOL_GPL(gether_set_qmult); |
bcd4a1c4 AP |
984 | |
985 | unsigned gether_get_qmult(struct net_device *net) | |
986 | { | |
987 | struct eth_dev *dev; | |
988 | ||
989 | dev = netdev_priv(net); | |
990 | return dev->qmult; | |
991 | } | |
0700faaf | 992 | EXPORT_SYMBOL_GPL(gether_get_qmult); |
bcd4a1c4 AP |
993 | |
994 | int gether_get_ifname(struct net_device *net, char *name, int len) | |
995 | { | |
996 | rtnl_lock(); | |
997 | strlcpy(name, netdev_name(net), len); | |
998 | rtnl_unlock(); | |
999 | return strlen(name); | |
1000 | } | |
0700faaf | 1001 | EXPORT_SYMBOL_GPL(gether_get_ifname); |
bcd4a1c4 | 1002 | |
2b3d942c DB |
1003 | /** |
1004 | * gether_cleanup - remove Ethernet-over-USB device | |
1005 | * Context: may sleep | |
1006 | * | |
1007 | * This is called to free all resources allocated by @gether_setup(). | |
1008 | */ | |
d6a01439 | 1009 | void gether_cleanup(struct eth_dev *dev) |
2b3d942c | 1010 | { |
d6a01439 | 1011 | if (!dev) |
2b3d942c DB |
1012 | return; |
1013 | ||
d6a01439 SAS |
1014 | unregister_netdev(dev->net); |
1015 | flush_work(&dev->work); | |
1016 | free_netdev(dev->net); | |
2b3d942c | 1017 | } |
0700faaf | 1018 | EXPORT_SYMBOL_GPL(gether_cleanup); |
2b3d942c | 1019 | |
2b3d942c DB |
1020 | /** |
1021 | * gether_connect - notify network layer that USB link is active | |
1022 | * @link: the USB link, set up with endpoints, descriptors matching | |
1023 | * current device speed, and any framing wrapper(s) set up. | |
1024 | * Context: irqs blocked | |
1025 | * | |
1026 | * This is called to activate endpoints and let the network layer know | |
1027 | * the connection is active ("carrier detect"). It may cause the I/O | |
1028 | * queues to open and start letting network packets flow, but will in | |
1029 | * any case activate the endpoints so that they respond properly to the | |
1030 | * USB host. | |
1031 | * | |
1032 | * Verify net_device pointer returned using IS_ERR(). If it doesn't | |
1033 | * indicate some error code (negative errno), ep->driver_data values | |
1034 | * have been overwritten. | |
1035 | */ | |
1036 | struct net_device *gether_connect(struct gether *link) | |
1037 | { | |
d6a01439 | 1038 | struct eth_dev *dev = link->ioport; |
2b3d942c DB |
1039 | int result = 0; |
1040 | ||
1041 | if (!dev) | |
1042 | return ERR_PTR(-EINVAL); | |
1043 | ||
1044 | link->in_ep->driver_data = dev; | |
72c973dd | 1045 | result = usb_ep_enable(link->in_ep); |
2b3d942c DB |
1046 | if (result != 0) { |
1047 | DBG(dev, "enable %s --> %d\n", | |
1048 | link->in_ep->name, result); | |
1049 | goto fail0; | |
1050 | } | |
1051 | ||
1052 | link->out_ep->driver_data = dev; | |
72c973dd | 1053 | result = usb_ep_enable(link->out_ep); |
2b3d942c DB |
1054 | if (result != 0) { |
1055 | DBG(dev, "enable %s --> %d\n", | |
1056 | link->out_ep->name, result); | |
1057 | goto fail1; | |
1058 | } | |
1059 | ||
1060 | if (result == 0) | |
f1a1823f AP |
1061 | result = alloc_requests(dev, link, qlen(dev->gadget, |
1062 | dev->qmult)); | |
2b3d942c DB |
1063 | |
1064 | if (result == 0) { | |
1065 | dev->zlp = link->is_zlp_ok; | |
f1a1823f | 1066 | DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult)); |
2b3d942c DB |
1067 | |
1068 | dev->header_len = link->header_len; | |
1069 | dev->unwrap = link->unwrap; | |
1070 | dev->wrap = link->wrap; | |
1071 | ||
1072 | spin_lock(&dev->lock); | |
1073 | dev->port_usb = link; | |
29bac7b7 DB |
1074 | if (netif_running(dev->net)) { |
1075 | if (link->open) | |
1076 | link->open(link); | |
1077 | } else { | |
1078 | if (link->close) | |
1079 | link->close(link); | |
1080 | } | |
2b3d942c DB |
1081 | spin_unlock(&dev->lock); |
1082 | ||
1083 | netif_carrier_on(dev->net); | |
1084 | if (netif_running(dev->net)) | |
1085 | eth_start(dev, GFP_ATOMIC); | |
1086 | ||
1087 | /* on error, disable any endpoints */ | |
1088 | } else { | |
1089 | (void) usb_ep_disable(link->out_ep); | |
1090 | fail1: | |
1091 | (void) usb_ep_disable(link->in_ep); | |
1092 | } | |
1093 | fail0: | |
1094 | /* caller is responsible for cleanup on error */ | |
1095 | if (result < 0) | |
1096 | return ERR_PTR(result); | |
1097 | return dev->net; | |
1098 | } | |
0700faaf | 1099 | EXPORT_SYMBOL_GPL(gether_connect); |
2b3d942c DB |
1100 | |
1101 | /** | |
1102 | * gether_disconnect - notify network layer that USB link is inactive | |
1103 | * @link: the USB link, on which gether_connect() was called | |
1104 | * Context: irqs blocked | |
1105 | * | |
1106 | * This is called to deactivate endpoints and let the network layer know | |
1107 | * the connection went inactive ("no carrier"). | |
1108 | * | |
1109 | * On return, the state is as if gether_connect() had never been called. | |
1110 | * The endpoints are inactive, and accordingly without active USB I/O. | |
1111 | * Pointers to endpoint descriptors and endpoint private data are nulled. | |
1112 | */ | |
1113 | void gether_disconnect(struct gether *link) | |
1114 | { | |
1115 | struct eth_dev *dev = link->ioport; | |
1116 | struct usb_request *req; | |
1117 | ||
1118 | WARN_ON(!dev); | |
1119 | if (!dev) | |
1120 | return; | |
1121 | ||
1122 | DBG(dev, "%s\n", __func__); | |
1123 | ||
1124 | netif_stop_queue(dev->net); | |
1125 | netif_carrier_off(dev->net); | |
1126 | ||
1127 | /* disable endpoints, forcing (synchronous) completion | |
1128 | * of all pending i/o. then free the request objects | |
1129 | * and forget about the endpoints. | |
1130 | */ | |
1131 | usb_ep_disable(link->in_ep); | |
1132 | spin_lock(&dev->req_lock); | |
1133 | while (!list_empty(&dev->tx_reqs)) { | |
1134 | req = container_of(dev->tx_reqs.next, | |
1135 | struct usb_request, list); | |
1136 | list_del(&req->list); | |
1137 | ||
1138 | spin_unlock(&dev->req_lock); | |
1139 | usb_ep_free_request(link->in_ep, req); | |
1140 | spin_lock(&dev->req_lock); | |
1141 | } | |
1142 | spin_unlock(&dev->req_lock); | |
72c973dd | 1143 | link->in_ep->desc = NULL; |
2b3d942c DB |
1144 | |
1145 | usb_ep_disable(link->out_ep); | |
1146 | spin_lock(&dev->req_lock); | |
1147 | while (!list_empty(&dev->rx_reqs)) { | |
1148 | req = container_of(dev->rx_reqs.next, | |
1149 | struct usb_request, list); | |
1150 | list_del(&req->list); | |
1151 | ||
1152 | spin_unlock(&dev->req_lock); | |
1153 | usb_ep_free_request(link->out_ep, req); | |
1154 | spin_lock(&dev->req_lock); | |
1155 | } | |
1156 | spin_unlock(&dev->req_lock); | |
72c973dd | 1157 | link->out_ep->desc = NULL; |
2b3d942c DB |
1158 | |
1159 | /* finish forgetting about this USB link episode */ | |
1160 | dev->header_len = 0; | |
1161 | dev->unwrap = NULL; | |
1162 | dev->wrap = NULL; | |
1163 | ||
1164 | spin_lock(&dev->lock); | |
1165 | dev->port_usb = NULL; | |
2b3d942c DB |
1166 | spin_unlock(&dev->lock); |
1167 | } | |
0700faaf | 1168 | EXPORT_SYMBOL_GPL(gether_disconnect); |
f1a1823f AP |
1169 | |
1170 | MODULE_LICENSE("GPL"); | |
1171 | MODULE_AUTHOR("David Brownell"); |