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 DB |
50 | |
51 | struct eth_dev { | |
52 | /* lock is held while accessing port_usb | |
2b3d942c DB |
53 | */ |
54 | spinlock_t lock; | |
55 | struct gether *port_usb; | |
56 | ||
57 | struct net_device *net; | |
58 | struct usb_gadget *gadget; | |
59 | ||
60 | spinlock_t req_lock; /* guard {rx,tx}_reqs */ | |
61 | struct list_head tx_reqs, rx_reqs; | |
62 | atomic_t tx_qlen; | |
63 | ||
9b39e9dd BN |
64 | struct sk_buff_head rx_frames; |
65 | ||
f1a1823f AP |
66 | unsigned qmult; |
67 | ||
2b3d942c | 68 | unsigned header_len; |
9b39e9dd BN |
69 | struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb); |
70 | int (*unwrap)(struct gether *, | |
71 | struct sk_buff *skb, | |
72 | struct sk_buff_head *list); | |
2b3d942c DB |
73 | |
74 | struct work_struct work; | |
75 | ||
76 | unsigned long todo; | |
77 | #define WORK_RX_MEMORY 0 | |
78 | ||
79 | bool zlp; | |
80 | u8 host_mac[ETH_ALEN]; | |
bcd4a1c4 | 81 | u8 dev_mac[ETH_ALEN]; |
2b3d942c DB |
82 | }; |
83 | ||
84 | /*-------------------------------------------------------------------------*/ | |
85 | ||
86 | #define RX_EXTRA 20 /* bytes guarding against rx overflows */ | |
87 | ||
88 | #define DEFAULT_QLEN 2 /* double buffering by default */ | |
89 | ||
04617db7 | 90 | /* for dual-speed hardware, use deeper queues at high/super speed */ |
f1a1823f | 91 | static inline int qlen(struct usb_gadget *gadget, unsigned qmult) |
2b3d942c | 92 | { |
04617db7 PZ |
93 | if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH || |
94 | gadget->speed == USB_SPEED_SUPER)) | |
2b3d942c DB |
95 | return qmult * DEFAULT_QLEN; |
96 | else | |
97 | return DEFAULT_QLEN; | |
98 | } | |
99 | ||
100 | /*-------------------------------------------------------------------------*/ | |
101 | ||
102 | /* REVISIT there must be a better way than having two sets | |
103 | * of debug calls ... | |
104 | */ | |
105 | ||
106 | #undef DBG | |
107 | #undef VDBG | |
108 | #undef ERROR | |
2b3d942c DB |
109 | #undef INFO |
110 | ||
111 | #define xprintk(d, level, fmt, args...) \ | |
112 | printk(level "%s: " fmt , (d)->net->name , ## args) | |
113 | ||
114 | #ifdef DEBUG | |
115 | #undef DEBUG | |
116 | #define DBG(dev, fmt, args...) \ | |
117 | xprintk(dev , KERN_DEBUG , fmt , ## args) | |
118 | #else | |
119 | #define DBG(dev, fmt, args...) \ | |
120 | do { } while (0) | |
121 | #endif /* DEBUG */ | |
122 | ||
123 | #ifdef VERBOSE_DEBUG | |
124 | #define VDBG DBG | |
125 | #else | |
126 | #define VDBG(dev, fmt, args...) \ | |
127 | do { } while (0) | |
128 | #endif /* DEBUG */ | |
129 | ||
130 | #define ERROR(dev, fmt, args...) \ | |
131 | xprintk(dev , KERN_ERR , fmt , ## args) | |
2b3d942c DB |
132 | #define INFO(dev, fmt, args...) \ |
133 | xprintk(dev , KERN_INFO , fmt , ## args) | |
134 | ||
135 | /*-------------------------------------------------------------------------*/ | |
136 | ||
137 | /* NETWORK DRIVER HOOKUP (to the layer above this driver) */ | |
138 | ||
ccad637b | 139 | static int ueth_change_mtu(struct net_device *net, int new_mtu) |
2b3d942c DB |
140 | { |
141 | struct eth_dev *dev = netdev_priv(net); | |
142 | unsigned long flags; | |
143 | int status = 0; | |
144 | ||
145 | /* don't change MTU on "live" link (peer won't know) */ | |
146 | spin_lock_irqsave(&dev->lock, flags); | |
147 | if (dev->port_usb) | |
148 | status = -EBUSY; | |
149 | else if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN) | |
150 | status = -ERANGE; | |
151 | else | |
152 | net->mtu = new_mtu; | |
153 | spin_unlock_irqrestore(&dev->lock, flags); | |
154 | ||
155 | return status; | |
156 | } | |
157 | ||
158 | static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p) | |
159 | { | |
7826d43f | 160 | struct eth_dev *dev = netdev_priv(net); |
2b3d942c | 161 | |
7826d43f JP |
162 | strlcpy(p->driver, "g_ether", sizeof(p->driver)); |
163 | strlcpy(p->version, UETH__VERSION, sizeof(p->version)); | |
164 | strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version)); | |
165 | strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info)); | |
2b3d942c DB |
166 | } |
167 | ||
2b3d942c DB |
168 | /* REVISIT can also support: |
169 | * - WOL (by tracking suspends and issuing remote wakeup) | |
170 | * - msglevel (implies updated messaging) | |
171 | * - ... probably more ethtool ops | |
172 | */ | |
173 | ||
0fc0b732 | 174 | static const struct ethtool_ops ops = { |
2b3d942c | 175 | .get_drvinfo = eth_get_drvinfo, |
237e75bf | 176 | .get_link = ethtool_op_get_link, |
2b3d942c DB |
177 | }; |
178 | ||
179 | static void defer_kevent(struct eth_dev *dev, int flag) | |
180 | { | |
181 | if (test_and_set_bit(flag, &dev->todo)) | |
182 | return; | |
183 | if (!schedule_work(&dev->work)) | |
184 | ERROR(dev, "kevent %d may have been dropped\n", flag); | |
185 | else | |
186 | DBG(dev, "kevent %d scheduled\n", flag); | |
187 | } | |
188 | ||
189 | static void rx_complete(struct usb_ep *ep, struct usb_request *req); | |
190 | ||
191 | static int | |
192 | rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags) | |
193 | { | |
194 | struct sk_buff *skb; | |
195 | int retval = -ENOMEM; | |
196 | size_t size = 0; | |
197 | struct usb_ep *out; | |
198 | unsigned long flags; | |
199 | ||
200 | spin_lock_irqsave(&dev->lock, flags); | |
201 | if (dev->port_usb) | |
202 | out = dev->port_usb->out_ep; | |
203 | else | |
204 | out = NULL; | |
205 | spin_unlock_irqrestore(&dev->lock, flags); | |
206 | ||
207 | if (!out) | |
208 | return -ENOTCONN; | |
209 | ||
210 | ||
211 | /* Padding up to RX_EXTRA handles minor disagreements with host. | |
212 | * Normally we use the USB "terminate on short read" convention; | |
213 | * so allow up to (N*maxpacket), since that memory is normally | |
214 | * already allocated. Some hardware doesn't deal well with short | |
215 | * reads (e.g. DMA must be N*maxpacket), so for now don't trim a | |
216 | * byte off the end (to force hardware errors on overflow). | |
217 | * | |
218 | * RNDIS uses internal framing, and explicitly allows senders to | |
219 | * pad to end-of-packet. That's potentially nice for speed, but | |
220 | * means receivers can't recover lost synch on their own (because | |
221 | * new packets don't only start after a short RX). | |
222 | */ | |
223 | size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA; | |
224 | size += dev->port_usb->header_len; | |
225 | size += out->maxpacket - 1; | |
226 | size -= size % out->maxpacket; | |
227 | ||
5c1168db | 228 | if (dev->port_usb->is_fixed) |
45d1b7ae | 229 | size = max_t(size_t, size, dev->port_usb->fixed_out_len); |
5c1168db | 230 | |
2b3d942c DB |
231 | skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags); |
232 | if (skb == NULL) { | |
233 | DBG(dev, "no rx skb\n"); | |
234 | goto enomem; | |
235 | } | |
236 | ||
237 | /* Some platforms perform better when IP packets are aligned, | |
238 | * but on at least one, checksumming fails otherwise. Note: | |
239 | * RNDIS headers involve variable numbers of LE32 values. | |
240 | */ | |
241 | skb_reserve(skb, NET_IP_ALIGN); | |
242 | ||
243 | req->buf = skb->data; | |
244 | req->length = size; | |
245 | req->complete = rx_complete; | |
246 | req->context = skb; | |
247 | ||
248 | retval = usb_ep_queue(out, req, gfp_flags); | |
249 | if (retval == -ENOMEM) | |
250 | enomem: | |
251 | defer_kevent(dev, WORK_RX_MEMORY); | |
252 | if (retval) { | |
253 | DBG(dev, "rx submit --> %d\n", retval); | |
254 | if (skb) | |
255 | dev_kfree_skb_any(skb); | |
9189a330 FB |
256 | spin_lock_irqsave(&dev->req_lock, flags); |
257 | list_add(&req->list, &dev->rx_reqs); | |
258 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
2b3d942c DB |
259 | } |
260 | return retval; | |
261 | } | |
262 | ||
263 | static void rx_complete(struct usb_ep *ep, struct usb_request *req) | |
264 | { | |
9189a330 | 265 | struct sk_buff *skb = req->context, *skb2; |
2b3d942c DB |
266 | struct eth_dev *dev = ep->driver_data; |
267 | int status = req->status; | |
268 | ||
269 | switch (status) { | |
270 | ||
271 | /* normal completion */ | |
272 | case 0: | |
273 | skb_put(skb, req->actual); | |
2b3d942c | 274 | |
9b39e9dd BN |
275 | if (dev->unwrap) { |
276 | unsigned long flags; | |
2b3d942c | 277 | |
9b39e9dd BN |
278 | spin_lock_irqsave(&dev->lock, flags); |
279 | if (dev->port_usb) { | |
280 | status = dev->unwrap(dev->port_usb, | |
281 | skb, | |
282 | &dev->rx_frames); | |
283 | } else { | |
284 | dev_kfree_skb_any(skb); | |
285 | status = -ENOTCONN; | |
286 | } | |
287 | spin_unlock_irqrestore(&dev->lock, flags); | |
288 | } else { | |
289 | skb_queue_tail(&dev->rx_frames, skb); | |
290 | } | |
9189a330 FB |
291 | skb = NULL; |
292 | ||
293 | skb2 = skb_dequeue(&dev->rx_frames); | |
294 | while (skb2) { | |
295 | if (status < 0 | |
296 | || ETH_HLEN > skb2->len | |
297 | || skb2->len > VLAN_ETH_FRAME_LEN) { | |
298 | dev->net->stats.rx_errors++; | |
299 | dev->net->stats.rx_length_errors++; | |
300 | DBG(dev, "rx length %d\n", skb2->len); | |
301 | dev_kfree_skb_any(skb2); | |
302 | goto next_frame; | |
303 | } | |
304 | skb2->protocol = eth_type_trans(skb2, dev->net); | |
305 | dev->net->stats.rx_packets++; | |
306 | dev->net->stats.rx_bytes += skb2->len; | |
307 | ||
308 | /* no buffer copies needed, unless hardware can't | |
309 | * use skb buffers. | |
310 | */ | |
311 | status = netif_rx(skb2); | |
312 | next_frame: | |
313 | skb2 = skb_dequeue(&dev->rx_frames); | |
314 | } | |
2b3d942c DB |
315 | break; |
316 | ||
317 | /* software-driven interface shutdown */ | |
318 | case -ECONNRESET: /* unlink */ | |
319 | case -ESHUTDOWN: /* disconnect etc */ | |
320 | VDBG(dev, "rx shutdown, code %d\n", status); | |
321 | goto quiesce; | |
322 | ||
323 | /* for hardware automagic (such as pxa) */ | |
324 | case -ECONNABORTED: /* endpoint reset */ | |
325 | DBG(dev, "rx %s reset\n", ep->name); | |
326 | defer_kevent(dev, WORK_RX_MEMORY); | |
327 | quiesce: | |
328 | dev_kfree_skb_any(skb); | |
329 | goto clean; | |
330 | ||
331 | /* data overrun */ | |
332 | case -EOVERFLOW: | |
333 | dev->net->stats.rx_over_errors++; | |
334 | /* FALLTHROUGH */ | |
335 | ||
336 | default: | |
337 | dev->net->stats.rx_errors++; | |
338 | DBG(dev, "rx status %d\n", status); | |
339 | break; | |
340 | } | |
341 | ||
9189a330 FB |
342 | if (skb) |
343 | dev_kfree_skb_any(skb); | |
344 | if (!netif_running(dev->net)) { | |
2b3d942c DB |
345 | clean: |
346 | spin_lock(&dev->req_lock); | |
347 | list_add(&req->list, &dev->rx_reqs); | |
348 | spin_unlock(&dev->req_lock); | |
9189a330 FB |
349 | req = NULL; |
350 | } | |
351 | if (req) | |
352 | rx_submit(dev, req, GFP_ATOMIC); | |
2b3d942c DB |
353 | } |
354 | ||
355 | static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n) | |
356 | { | |
357 | unsigned i; | |
358 | struct usb_request *req; | |
359 | ||
360 | if (!n) | |
361 | return -ENOMEM; | |
362 | ||
363 | /* queue/recycle up to N requests */ | |
364 | i = n; | |
365 | list_for_each_entry(req, list, list) { | |
366 | if (i-- == 0) | |
367 | goto extra; | |
368 | } | |
369 | while (i--) { | |
370 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); | |
371 | if (!req) | |
372 | return list_empty(list) ? -ENOMEM : 0; | |
373 | list_add(&req->list, list); | |
374 | } | |
375 | return 0; | |
376 | ||
377 | extra: | |
378 | /* free extras */ | |
379 | for (;;) { | |
380 | struct list_head *next; | |
381 | ||
382 | next = req->list.next; | |
383 | list_del(&req->list); | |
384 | usb_ep_free_request(ep, req); | |
385 | ||
386 | if (next == list) | |
387 | break; | |
388 | ||
389 | req = container_of(next, struct usb_request, list); | |
390 | } | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n) | |
395 | { | |
396 | int status; | |
397 | ||
398 | spin_lock(&dev->req_lock); | |
399 | status = prealloc(&dev->tx_reqs, link->in_ep, n); | |
400 | if (status < 0) | |
401 | goto fail; | |
402 | status = prealloc(&dev->rx_reqs, link->out_ep, n); | |
403 | if (status < 0) | |
404 | goto fail; | |
405 | goto done; | |
406 | fail: | |
407 | DBG(dev, "can't alloc requests\n"); | |
408 | done: | |
409 | spin_unlock(&dev->req_lock); | |
410 | return status; | |
411 | } | |
412 | ||
413 | static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags) | |
414 | { | |
415 | struct usb_request *req; | |
416 | unsigned long flags; | |
417 | ||
418 | /* fill unused rxq slots with some skb */ | |
419 | spin_lock_irqsave(&dev->req_lock, flags); | |
420 | while (!list_empty(&dev->rx_reqs)) { | |
421 | req = container_of(dev->rx_reqs.next, | |
422 | struct usb_request, list); | |
423 | list_del_init(&req->list); | |
424 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
425 | ||
426 | if (rx_submit(dev, req, gfp_flags) < 0) { | |
427 | defer_kevent(dev, WORK_RX_MEMORY); | |
428 | return; | |
429 | } | |
430 | ||
431 | spin_lock_irqsave(&dev->req_lock, flags); | |
432 | } | |
433 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
434 | } | |
435 | ||
436 | static void eth_work(struct work_struct *work) | |
437 | { | |
438 | struct eth_dev *dev = container_of(work, struct eth_dev, work); | |
439 | ||
440 | if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) { | |
441 | if (netif_running(dev->net)) | |
442 | rx_fill(dev, GFP_KERNEL); | |
443 | } | |
444 | ||
445 | if (dev->todo) | |
446 | DBG(dev, "work done, flags = 0x%lx\n", dev->todo); | |
447 | } | |
448 | ||
449 | static void tx_complete(struct usb_ep *ep, struct usb_request *req) | |
450 | { | |
451 | struct sk_buff *skb = req->context; | |
452 | struct eth_dev *dev = ep->driver_data; | |
453 | ||
454 | switch (req->status) { | |
455 | default: | |
456 | dev->net->stats.tx_errors++; | |
457 | VDBG(dev, "tx err %d\n", req->status); | |
458 | /* FALLTHROUGH */ | |
459 | case -ECONNRESET: /* unlink */ | |
460 | case -ESHUTDOWN: /* disconnect etc */ | |
461 | break; | |
462 | case 0: | |
463 | dev->net->stats.tx_bytes += skb->len; | |
464 | } | |
465 | dev->net->stats.tx_packets++; | |
466 | ||
467 | spin_lock(&dev->req_lock); | |
468 | list_add(&req->list, &dev->tx_reqs); | |
469 | spin_unlock(&dev->req_lock); | |
470 | dev_kfree_skb_any(skb); | |
471 | ||
472 | atomic_dec(&dev->tx_qlen); | |
473 | if (netif_carrier_ok(dev->net)) | |
474 | netif_wake_queue(dev->net); | |
475 | } | |
476 | ||
477 | static inline int is_promisc(u16 cdc_filter) | |
478 | { | |
479 | return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS; | |
480 | } | |
481 | ||
25a79c41 SH |
482 | static netdev_tx_t eth_start_xmit(struct sk_buff *skb, |
483 | struct net_device *net) | |
2b3d942c DB |
484 | { |
485 | struct eth_dev *dev = netdev_priv(net); | |
6d3865f9 | 486 | int length = 0; |
2b3d942c DB |
487 | int retval; |
488 | struct usb_request *req = NULL; | |
489 | unsigned long flags; | |
490 | struct usb_ep *in; | |
491 | u16 cdc_filter; | |
492 | ||
493 | spin_lock_irqsave(&dev->lock, flags); | |
494 | if (dev->port_usb) { | |
495 | in = dev->port_usb->in_ep; | |
496 | cdc_filter = dev->port_usb->cdc_filter; | |
497 | } else { | |
498 | in = NULL; | |
499 | cdc_filter = 0; | |
500 | } | |
501 | spin_unlock_irqrestore(&dev->lock, flags); | |
502 | ||
6d3865f9 | 503 | if (skb && !in) { |
2b3d942c | 504 | dev_kfree_skb_any(skb); |
6ed10654 | 505 | return NETDEV_TX_OK; |
2b3d942c DB |
506 | } |
507 | ||
508 | /* apply outgoing CDC or RNDIS filters */ | |
6d3865f9 | 509 | if (skb && !is_promisc(cdc_filter)) { |
2b3d942c DB |
510 | u8 *dest = skb->data; |
511 | ||
512 | if (is_multicast_ether_addr(dest)) { | |
513 | u16 type; | |
514 | ||
515 | /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host | |
516 | * SET_ETHERNET_MULTICAST_FILTERS requests | |
517 | */ | |
518 | if (is_broadcast_ether_addr(dest)) | |
519 | type = USB_CDC_PACKET_TYPE_BROADCAST; | |
520 | else | |
521 | type = USB_CDC_PACKET_TYPE_ALL_MULTICAST; | |
522 | if (!(cdc_filter & type)) { | |
523 | dev_kfree_skb_any(skb); | |
6ed10654 | 524 | return NETDEV_TX_OK; |
2b3d942c DB |
525 | } |
526 | } | |
527 | /* ignores USB_CDC_PACKET_TYPE_DIRECTED */ | |
528 | } | |
529 | ||
530 | spin_lock_irqsave(&dev->req_lock, flags); | |
531 | /* | |
532 | * this freelist can be empty if an interrupt triggered disconnect() | |
533 | * and reconfigured the gadget (shutting down this queue) after the | |
534 | * network stack decided to xmit but before we got the spinlock. | |
535 | */ | |
536 | if (list_empty(&dev->tx_reqs)) { | |
537 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
5b548140 | 538 | return NETDEV_TX_BUSY; |
2b3d942c DB |
539 | } |
540 | ||
541 | req = container_of(dev->tx_reqs.next, struct usb_request, list); | |
542 | list_del(&req->list); | |
543 | ||
544 | /* temporarily stop TX queue when the freelist empties */ | |
545 | if (list_empty(&dev->tx_reqs)) | |
546 | netif_stop_queue(net); | |
547 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
548 | ||
549 | /* no buffer copies needed, unless the network stack did it | |
550 | * or the hardware can't use skb buffers. | |
551 | * or there's not enough space for extra headers we need | |
552 | */ | |
553 | if (dev->wrap) { | |
9b39e9dd | 554 | unsigned long flags; |
2b3d942c | 555 | |
9b39e9dd BN |
556 | spin_lock_irqsave(&dev->lock, flags); |
557 | if (dev->port_usb) | |
558 | skb = dev->wrap(dev->port_usb, skb); | |
559 | spin_unlock_irqrestore(&dev->lock, flags); | |
6d3865f9 JB |
560 | if (!skb) { |
561 | /* Multi frame CDC protocols may store the frame for | |
562 | * later which is not a dropped frame. | |
563 | */ | |
564 | if (dev->port_usb->supports_multi_frame) | |
565 | goto multiframe; | |
2b3d942c | 566 | goto drop; |
6d3865f9 | 567 | } |
2b3d942c | 568 | } |
6d3865f9 JB |
569 | |
570 | length = skb->len; | |
2b3d942c DB |
571 | req->buf = skb->data; |
572 | req->context = skb; | |
573 | req->complete = tx_complete; | |
574 | ||
5c1168db YK |
575 | /* NCM requires no zlp if transfer is dwNtbInMaxSize */ |
576 | if (dev->port_usb->is_fixed && | |
577 | length == dev->port_usb->fixed_in_len && | |
578 | (length % in->maxpacket) == 0) | |
579 | req->zero = 0; | |
580 | else | |
581 | req->zero = 1; | |
582 | ||
2b3d942c DB |
583 | /* use zlp framing on tx for strict CDC-Ether conformance, |
584 | * though any robust network rx path ignores extra padding. | |
585 | * and some hardware doesn't like to write zlps. | |
586 | */ | |
5c1168db | 587 | if (req->zero && !dev->zlp && (length % in->maxpacket) == 0) |
2b3d942c DB |
588 | length++; |
589 | ||
590 | req->length = length; | |
591 | ||
04617db7 | 592 | /* throttle high/super speed IRQ rate back slightly */ |
2b3d942c | 593 | if (gadget_is_dualspeed(dev->gadget)) |
04617db7 PZ |
594 | req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH || |
595 | dev->gadget->speed == USB_SPEED_SUPER) | |
f1a1823f | 596 | ? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0) |
2b3d942c DB |
597 | : 0; |
598 | ||
599 | retval = usb_ep_queue(in, req, GFP_ATOMIC); | |
600 | switch (retval) { | |
601 | default: | |
602 | DBG(dev, "tx queue err %d\n", retval); | |
603 | break; | |
604 | case 0: | |
605 | net->trans_start = jiffies; | |
606 | atomic_inc(&dev->tx_qlen); | |
607 | } | |
608 | ||
609 | if (retval) { | |
9b39e9dd | 610 | dev_kfree_skb_any(skb); |
2b3d942c DB |
611 | drop: |
612 | dev->net->stats.tx_dropped++; | |
6d3865f9 | 613 | multiframe: |
2b3d942c DB |
614 | spin_lock_irqsave(&dev->req_lock, flags); |
615 | if (list_empty(&dev->tx_reqs)) | |
616 | netif_start_queue(net); | |
617 | list_add(&req->list, &dev->tx_reqs); | |
618 | spin_unlock_irqrestore(&dev->req_lock, flags); | |
619 | } | |
6ed10654 | 620 | return NETDEV_TX_OK; |
2b3d942c DB |
621 | } |
622 | ||
623 | /*-------------------------------------------------------------------------*/ | |
624 | ||
625 | static void eth_start(struct eth_dev *dev, gfp_t gfp_flags) | |
626 | { | |
627 | DBG(dev, "%s\n", __func__); | |
628 | ||
629 | /* fill the rx queue */ | |
630 | rx_fill(dev, gfp_flags); | |
631 | ||
632 | /* and open the tx floodgates */ | |
633 | atomic_set(&dev->tx_qlen, 0); | |
634 | netif_wake_queue(dev->net); | |
635 | } | |
636 | ||
637 | static int eth_open(struct net_device *net) | |
638 | { | |
639 | struct eth_dev *dev = netdev_priv(net); | |
640 | struct gether *link; | |
641 | ||
642 | DBG(dev, "%s\n", __func__); | |
643 | if (netif_carrier_ok(dev->net)) | |
644 | eth_start(dev, GFP_KERNEL); | |
645 | ||
646 | spin_lock_irq(&dev->lock); | |
647 | link = dev->port_usb; | |
648 | if (link && link->open) | |
649 | link->open(link); | |
650 | spin_unlock_irq(&dev->lock); | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | static int eth_stop(struct net_device *net) | |
656 | { | |
657 | struct eth_dev *dev = netdev_priv(net); | |
658 | unsigned long flags; | |
659 | ||
660 | VDBG(dev, "%s\n", __func__); | |
661 | netif_stop_queue(net); | |
662 | ||
663 | DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", | |
664 | dev->net->stats.rx_packets, dev->net->stats.tx_packets, | |
665 | dev->net->stats.rx_errors, dev->net->stats.tx_errors | |
666 | ); | |
667 | ||
668 | /* ensure there are no more active requests */ | |
669 | spin_lock_irqsave(&dev->lock, flags); | |
670 | if (dev->port_usb) { | |
671 | struct gether *link = dev->port_usb; | |
b1b552a6 MG |
672 | const struct usb_endpoint_descriptor *in; |
673 | const struct usb_endpoint_descriptor *out; | |
2b3d942c DB |
674 | |
675 | if (link->close) | |
676 | link->close(link); | |
677 | ||
678 | /* NOTE: we have no abort-queue primitive we could use | |
679 | * to cancel all pending I/O. Instead, we disable then | |
680 | * reenable the endpoints ... this idiom may leave toggle | |
681 | * wrong, but that's a self-correcting error. | |
682 | * | |
683 | * REVISIT: we *COULD* just let the transfers complete at | |
684 | * their own pace; the network stack can handle old packets. | |
685 | * For the moment we leave this here, since it works. | |
686 | */ | |
b1b552a6 MG |
687 | in = link->in_ep->desc; |
688 | out = link->out_ep->desc; | |
2b3d942c DB |
689 | usb_ep_disable(link->in_ep); |
690 | usb_ep_disable(link->out_ep); | |
691 | if (netif_carrier_ok(net)) { | |
692 | DBG(dev, "host still using in/out endpoints\n"); | |
b1b552a6 MG |
693 | link->in_ep->desc = in; |
694 | link->out_ep->desc = out; | |
72c973dd TB |
695 | usb_ep_enable(link->in_ep); |
696 | usb_ep_enable(link->out_ep); | |
2b3d942c DB |
697 | } |
698 | } | |
699 | spin_unlock_irqrestore(&dev->lock, flags); | |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | /*-------------------------------------------------------------------------*/ | |
705 | ||
28824b18 | 706 | static int get_ether_addr(const char *str, u8 *dev_addr) |
2b3d942c DB |
707 | { |
708 | if (str) { | |
709 | unsigned i; | |
710 | ||
711 | for (i = 0; i < 6; i++) { | |
712 | unsigned char num; | |
713 | ||
714 | if ((*str == '.') || (*str == ':')) | |
715 | str++; | |
e644814a AS |
716 | num = hex_to_bin(*str++) << 4; |
717 | num |= hex_to_bin(*str++); | |
2b3d942c DB |
718 | dev_addr [i] = num; |
719 | } | |
720 | if (is_valid_ether_addr(dev_addr)) | |
721 | return 0; | |
722 | } | |
006c9139 | 723 | eth_random_addr(dev_addr); |
2b3d942c DB |
724 | return 1; |
725 | } | |
726 | ||
bcd4a1c4 AP |
727 | static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len) |
728 | { | |
729 | if (len < 18) | |
730 | return -EINVAL; | |
731 | ||
732 | snprintf(str, len, "%02x:%02x:%02x:%02x:%02x:%02x", | |
733 | dev_addr[0], dev_addr[1], dev_addr[2], | |
734 | dev_addr[3], dev_addr[4], dev_addr[5]); | |
735 | return 18; | |
736 | } | |
737 | ||
5ec38f30 SH |
738 | static const struct net_device_ops eth_netdev_ops = { |
739 | .ndo_open = eth_open, | |
740 | .ndo_stop = eth_stop, | |
741 | .ndo_start_xmit = eth_start_xmit, | |
742 | .ndo_change_mtu = ueth_change_mtu, | |
743 | .ndo_set_mac_address = eth_mac_addr, | |
744 | .ndo_validate_addr = eth_validate_addr, | |
745 | }; | |
2b3d942c | 746 | |
aa790740 MH |
747 | static struct device_type gadget_type = { |
748 | .name = "gadget", | |
749 | }; | |
750 | ||
2b3d942c | 751 | /** |
036e98b2 | 752 | * gether_setup_name - initialize one ethernet-over-usb link |
2b3d942c DB |
753 | * @g: gadget to associated with these links |
754 | * @ethaddr: NULL, or a buffer in which the ethernet address of the | |
755 | * host side of the link is recorded | |
036e98b2 | 756 | * @netname: name for network device (for example, "usb") |
2b3d942c DB |
757 | * Context: may sleep |
758 | * | |
759 | * This sets up the single network link that may be exported by a | |
760 | * gadget driver using this framework. The link layer addresses are | |
761 | * set up using module parameters. | |
762 | * | |
574f24f7 | 763 | * Returns an eth_dev pointer on success, or an ERR_PTR on failure. |
2b3d942c | 764 | */ |
f1a1823f AP |
765 | struct eth_dev *gether_setup_name(struct usb_gadget *g, |
766 | const char *dev_addr, const char *host_addr, | |
767 | u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname) | |
2b3d942c DB |
768 | { |
769 | struct eth_dev *dev; | |
770 | struct net_device *net; | |
771 | int status; | |
772 | ||
2b3d942c DB |
773 | net = alloc_etherdev(sizeof *dev); |
774 | if (!net) | |
d6a01439 | 775 | return ERR_PTR(-ENOMEM); |
2b3d942c DB |
776 | |
777 | dev = netdev_priv(net); | |
778 | spin_lock_init(&dev->lock); | |
779 | spin_lock_init(&dev->req_lock); | |
780 | INIT_WORK(&dev->work, eth_work); | |
781 | INIT_LIST_HEAD(&dev->tx_reqs); | |
782 | INIT_LIST_HEAD(&dev->rx_reqs); | |
783 | ||
9b39e9dd BN |
784 | skb_queue_head_init(&dev->rx_frames); |
785 | ||
2b3d942c DB |
786 | /* network device setup */ |
787 | dev->net = net; | |
f1a1823f | 788 | dev->qmult = qmult; |
036e98b2 | 789 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); |
2b3d942c DB |
790 | |
791 | if (get_ether_addr(dev_addr, net->dev_addr)) | |
792 | dev_warn(&g->dev, | |
793 | "using random %s ethernet address\n", "self"); | |
794 | if (get_ether_addr(host_addr, dev->host_mac)) | |
795 | dev_warn(&g->dev, | |
796 | "using random %s ethernet address\n", "host"); | |
797 | ||
798 | if (ethaddr) | |
799 | memcpy(ethaddr, dev->host_mac, ETH_ALEN); | |
800 | ||
5ec38f30 SH |
801 | net->netdev_ops = ð_netdev_ops; |
802 | ||
7ad24ea4 | 803 | net->ethtool_ops = &ops; |
2b3d942c | 804 | |
2b3d942c DB |
805 | dev->gadget = g; |
806 | SET_NETDEV_DEV(net, &g->dev); | |
aa790740 | 807 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
2b3d942c DB |
808 | |
809 | status = register_netdev(net); | |
810 | if (status < 0) { | |
811 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); | |
812 | free_netdev(net); | |
d6a01439 | 813 | dev = ERR_PTR(status); |
2b3d942c | 814 | } else { |
e174961c JB |
815 | INFO(dev, "MAC %pM\n", net->dev_addr); |
816 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); | |
2b3d942c | 817 | |
bcd4a1c4 AP |
818 | /* |
819 | * two kinds of host-initiated state changes: | |
31bde1ce KC |
820 | * - iff DATA transfer is active, carrier is "on" |
821 | * - tx queueing enabled if open *and* carrier is "on" | |
822 | */ | |
823 | netif_carrier_off(net); | |
2b3d942c DB |
824 | } |
825 | ||
d6a01439 | 826 | return dev; |
2b3d942c | 827 | } |
0700faaf | 828 | EXPORT_SYMBOL_GPL(gether_setup_name); |
2b3d942c | 829 | |
bcd4a1c4 AP |
830 | struct net_device *gether_setup_name_default(const char *netname) |
831 | { | |
832 | struct net_device *net; | |
833 | struct eth_dev *dev; | |
834 | ||
835 | net = alloc_etherdev(sizeof(*dev)); | |
836 | if (!net) | |
837 | return ERR_PTR(-ENOMEM); | |
838 | ||
839 | dev = netdev_priv(net); | |
840 | spin_lock_init(&dev->lock); | |
841 | spin_lock_init(&dev->req_lock); | |
842 | INIT_WORK(&dev->work, eth_work); | |
843 | INIT_LIST_HEAD(&dev->tx_reqs); | |
844 | INIT_LIST_HEAD(&dev->rx_reqs); | |
845 | ||
846 | skb_queue_head_init(&dev->rx_frames); | |
847 | ||
848 | /* network device setup */ | |
849 | dev->net = net; | |
850 | dev->qmult = QMULT_DEFAULT; | |
851 | snprintf(net->name, sizeof(net->name), "%s%%d", netname); | |
852 | ||
853 | eth_random_addr(dev->dev_mac); | |
854 | pr_warn("using random %s ethernet address\n", "self"); | |
855 | eth_random_addr(dev->host_mac); | |
856 | pr_warn("using random %s ethernet address\n", "host"); | |
857 | ||
858 | net->netdev_ops = ð_netdev_ops; | |
859 | ||
7ad24ea4 | 860 | net->ethtool_ops = &ops; |
bcd4a1c4 AP |
861 | SET_NETDEV_DEVTYPE(net, &gadget_type); |
862 | ||
863 | return net; | |
864 | } | |
0700faaf | 865 | EXPORT_SYMBOL_GPL(gether_setup_name_default); |
bcd4a1c4 AP |
866 | |
867 | int gether_register_netdev(struct net_device *net) | |
868 | { | |
869 | struct eth_dev *dev; | |
870 | struct usb_gadget *g; | |
871 | struct sockaddr sa; | |
872 | int status; | |
873 | ||
874 | if (!net->dev.parent) | |
875 | return -EINVAL; | |
876 | dev = netdev_priv(net); | |
877 | g = dev->gadget; | |
878 | status = register_netdev(net); | |
879 | if (status < 0) { | |
880 | dev_dbg(&g->dev, "register_netdev failed, %d\n", status); | |
881 | return status; | |
882 | } else { | |
883 | INFO(dev, "HOST MAC %pM\n", dev->host_mac); | |
884 | ||
885 | /* two kinds of host-initiated state changes: | |
886 | * - iff DATA transfer is active, carrier is "on" | |
887 | * - tx queueing enabled if open *and* carrier is "on" | |
888 | */ | |
889 | netif_carrier_off(net); | |
890 | } | |
891 | sa.sa_family = net->type; | |
892 | memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN); | |
893 | rtnl_lock(); | |
894 | status = dev_set_mac_address(net, &sa); | |
895 | rtnl_unlock(); | |
896 | if (status) | |
897 | pr_warn("cannot set self ethernet address: %d\n", status); | |
898 | else | |
899 | INFO(dev, "MAC %pM\n", dev->dev_mac); | |
900 | ||
901 | return status; | |
902 | } | |
0700faaf | 903 | EXPORT_SYMBOL_GPL(gether_register_netdev); |
bcd4a1c4 AP |
904 | |
905 | void gether_set_gadget(struct net_device *net, struct usb_gadget *g) | |
906 | { | |
907 | struct eth_dev *dev; | |
908 | ||
909 | dev = netdev_priv(net); | |
910 | dev->gadget = g; | |
911 | SET_NETDEV_DEV(net, &g->dev); | |
912 | } | |
0700faaf | 913 | EXPORT_SYMBOL_GPL(gether_set_gadget); |
bcd4a1c4 AP |
914 | |
915 | int gether_set_dev_addr(struct net_device *net, const char *dev_addr) | |
916 | { | |
917 | struct eth_dev *dev; | |
918 | u8 new_addr[ETH_ALEN]; | |
919 | ||
920 | dev = netdev_priv(net); | |
921 | if (get_ether_addr(dev_addr, new_addr)) | |
922 | return -EINVAL; | |
923 | memcpy(dev->dev_mac, new_addr, ETH_ALEN); | |
924 | return 0; | |
925 | } | |
0700faaf | 926 | EXPORT_SYMBOL_GPL(gether_set_dev_addr); |
bcd4a1c4 AP |
927 | |
928 | int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len) | |
929 | { | |
930 | struct eth_dev *dev; | |
931 | ||
932 | dev = netdev_priv(net); | |
933 | return get_ether_addr_str(dev->dev_mac, dev_addr, len); | |
934 | } | |
0700faaf | 935 | EXPORT_SYMBOL_GPL(gether_get_dev_addr); |
bcd4a1c4 AP |
936 | |
937 | int gether_set_host_addr(struct net_device *net, const char *host_addr) | |
938 | { | |
939 | struct eth_dev *dev; | |
940 | u8 new_addr[ETH_ALEN]; | |
941 | ||
942 | dev = netdev_priv(net); | |
943 | if (get_ether_addr(host_addr, new_addr)) | |
944 | return -EINVAL; | |
945 | memcpy(dev->host_mac, new_addr, ETH_ALEN); | |
946 | return 0; | |
947 | } | |
0700faaf | 948 | EXPORT_SYMBOL_GPL(gether_set_host_addr); |
bcd4a1c4 AP |
949 | |
950 | int gether_get_host_addr(struct net_device *net, char *host_addr, int len) | |
951 | { | |
952 | struct eth_dev *dev; | |
953 | ||
954 | dev = netdev_priv(net); | |
955 | return get_ether_addr_str(dev->host_mac, host_addr, len); | |
956 | } | |
0700faaf | 957 | EXPORT_SYMBOL_GPL(gether_get_host_addr); |
bcd4a1c4 AP |
958 | |
959 | int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len) | |
960 | { | |
961 | struct eth_dev *dev; | |
962 | ||
963 | if (len < 13) | |
964 | return -EINVAL; | |
965 | ||
966 | dev = netdev_priv(net); | |
967 | snprintf(host_addr, len, "%pm", dev->host_mac); | |
968 | ||
969 | return strlen(host_addr); | |
970 | } | |
0700faaf | 971 | EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc); |
bcd4a1c4 | 972 | |
bf4277c7 AP |
973 | void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN]) |
974 | { | |
975 | struct eth_dev *dev; | |
976 | ||
977 | dev = netdev_priv(net); | |
978 | memcpy(host_mac, dev->host_mac, ETH_ALEN); | |
979 | } | |
0700faaf | 980 | EXPORT_SYMBOL_GPL(gether_get_host_addr_u8); |
bf4277c7 | 981 | |
bcd4a1c4 AP |
982 | void gether_set_qmult(struct net_device *net, unsigned qmult) |
983 | { | |
984 | struct eth_dev *dev; | |
985 | ||
986 | dev = netdev_priv(net); | |
987 | dev->qmult = qmult; | |
988 | } | |
0700faaf | 989 | EXPORT_SYMBOL_GPL(gether_set_qmult); |
bcd4a1c4 AP |
990 | |
991 | unsigned gether_get_qmult(struct net_device *net) | |
992 | { | |
993 | struct eth_dev *dev; | |
994 | ||
995 | dev = netdev_priv(net); | |
996 | return dev->qmult; | |
997 | } | |
0700faaf | 998 | EXPORT_SYMBOL_GPL(gether_get_qmult); |
bcd4a1c4 AP |
999 | |
1000 | int gether_get_ifname(struct net_device *net, char *name, int len) | |
1001 | { | |
1002 | rtnl_lock(); | |
1003 | strlcpy(name, netdev_name(net), len); | |
1004 | rtnl_unlock(); | |
1005 | return strlen(name); | |
1006 | } | |
0700faaf | 1007 | EXPORT_SYMBOL_GPL(gether_get_ifname); |
bcd4a1c4 | 1008 | |
2b3d942c DB |
1009 | /** |
1010 | * gether_cleanup - remove Ethernet-over-USB device | |
1011 | * Context: may sleep | |
1012 | * | |
1013 | * This is called to free all resources allocated by @gether_setup(). | |
1014 | */ | |
d6a01439 | 1015 | void gether_cleanup(struct eth_dev *dev) |
2b3d942c | 1016 | { |
d6a01439 | 1017 | if (!dev) |
2b3d942c DB |
1018 | return; |
1019 | ||
d6a01439 SAS |
1020 | unregister_netdev(dev->net); |
1021 | flush_work(&dev->work); | |
1022 | free_netdev(dev->net); | |
2b3d942c | 1023 | } |
0700faaf | 1024 | EXPORT_SYMBOL_GPL(gether_cleanup); |
2b3d942c | 1025 | |
2b3d942c DB |
1026 | /** |
1027 | * gether_connect - notify network layer that USB link is active | |
1028 | * @link: the USB link, set up with endpoints, descriptors matching | |
1029 | * current device speed, and any framing wrapper(s) set up. | |
1030 | * Context: irqs blocked | |
1031 | * | |
1032 | * This is called to activate endpoints and let the network layer know | |
1033 | * the connection is active ("carrier detect"). It may cause the I/O | |
1034 | * queues to open and start letting network packets flow, but will in | |
1035 | * any case activate the endpoints so that they respond properly to the | |
1036 | * USB host. | |
1037 | * | |
1038 | * Verify net_device pointer returned using IS_ERR(). If it doesn't | |
1039 | * indicate some error code (negative errno), ep->driver_data values | |
1040 | * have been overwritten. | |
1041 | */ | |
1042 | struct net_device *gether_connect(struct gether *link) | |
1043 | { | |
d6a01439 | 1044 | struct eth_dev *dev = link->ioport; |
2b3d942c DB |
1045 | int result = 0; |
1046 | ||
1047 | if (!dev) | |
1048 | return ERR_PTR(-EINVAL); | |
1049 | ||
1050 | link->in_ep->driver_data = dev; | |
72c973dd | 1051 | result = usb_ep_enable(link->in_ep); |
2b3d942c DB |
1052 | if (result != 0) { |
1053 | DBG(dev, "enable %s --> %d\n", | |
1054 | link->in_ep->name, result); | |
1055 | goto fail0; | |
1056 | } | |
1057 | ||
1058 | link->out_ep->driver_data = dev; | |
72c973dd | 1059 | result = usb_ep_enable(link->out_ep); |
2b3d942c DB |
1060 | if (result != 0) { |
1061 | DBG(dev, "enable %s --> %d\n", | |
1062 | link->out_ep->name, result); | |
1063 | goto fail1; | |
1064 | } | |
1065 | ||
1066 | if (result == 0) | |
f1a1823f AP |
1067 | result = alloc_requests(dev, link, qlen(dev->gadget, |
1068 | dev->qmult)); | |
2b3d942c DB |
1069 | |
1070 | if (result == 0) { | |
1071 | dev->zlp = link->is_zlp_ok; | |
f1a1823f | 1072 | DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult)); |
2b3d942c DB |
1073 | |
1074 | dev->header_len = link->header_len; | |
1075 | dev->unwrap = link->unwrap; | |
1076 | dev->wrap = link->wrap; | |
1077 | ||
1078 | spin_lock(&dev->lock); | |
1079 | dev->port_usb = link; | |
29bac7b7 DB |
1080 | if (netif_running(dev->net)) { |
1081 | if (link->open) | |
1082 | link->open(link); | |
1083 | } else { | |
1084 | if (link->close) | |
1085 | link->close(link); | |
1086 | } | |
2b3d942c DB |
1087 | spin_unlock(&dev->lock); |
1088 | ||
1089 | netif_carrier_on(dev->net); | |
1090 | if (netif_running(dev->net)) | |
1091 | eth_start(dev, GFP_ATOMIC); | |
1092 | ||
1093 | /* on error, disable any endpoints */ | |
1094 | } else { | |
1095 | (void) usb_ep_disable(link->out_ep); | |
1096 | fail1: | |
1097 | (void) usb_ep_disable(link->in_ep); | |
1098 | } | |
1099 | fail0: | |
1100 | /* caller is responsible for cleanup on error */ | |
1101 | if (result < 0) | |
1102 | return ERR_PTR(result); | |
1103 | return dev->net; | |
1104 | } | |
0700faaf | 1105 | EXPORT_SYMBOL_GPL(gether_connect); |
2b3d942c DB |
1106 | |
1107 | /** | |
1108 | * gether_disconnect - notify network layer that USB link is inactive | |
1109 | * @link: the USB link, on which gether_connect() was called | |
1110 | * Context: irqs blocked | |
1111 | * | |
1112 | * This is called to deactivate endpoints and let the network layer know | |
1113 | * the connection went inactive ("no carrier"). | |
1114 | * | |
1115 | * On return, the state is as if gether_connect() had never been called. | |
1116 | * The endpoints are inactive, and accordingly without active USB I/O. | |
1117 | * Pointers to endpoint descriptors and endpoint private data are nulled. | |
1118 | */ | |
1119 | void gether_disconnect(struct gether *link) | |
1120 | { | |
1121 | struct eth_dev *dev = link->ioport; | |
1122 | struct usb_request *req; | |
1123 | ||
1124 | WARN_ON(!dev); | |
1125 | if (!dev) | |
1126 | return; | |
1127 | ||
1128 | DBG(dev, "%s\n", __func__); | |
1129 | ||
1130 | netif_stop_queue(dev->net); | |
1131 | netif_carrier_off(dev->net); | |
1132 | ||
1133 | /* disable endpoints, forcing (synchronous) completion | |
1134 | * of all pending i/o. then free the request objects | |
1135 | * and forget about the endpoints. | |
1136 | */ | |
1137 | usb_ep_disable(link->in_ep); | |
1138 | spin_lock(&dev->req_lock); | |
1139 | while (!list_empty(&dev->tx_reqs)) { | |
1140 | req = container_of(dev->tx_reqs.next, | |
1141 | struct usb_request, list); | |
1142 | list_del(&req->list); | |
1143 | ||
1144 | spin_unlock(&dev->req_lock); | |
1145 | usb_ep_free_request(link->in_ep, req); | |
1146 | spin_lock(&dev->req_lock); | |
1147 | } | |
1148 | spin_unlock(&dev->req_lock); | |
1149 | link->in_ep->driver_data = NULL; | |
72c973dd | 1150 | link->in_ep->desc = NULL; |
2b3d942c DB |
1151 | |
1152 | usb_ep_disable(link->out_ep); | |
1153 | spin_lock(&dev->req_lock); | |
1154 | while (!list_empty(&dev->rx_reqs)) { | |
1155 | req = container_of(dev->rx_reqs.next, | |
1156 | struct usb_request, list); | |
1157 | list_del(&req->list); | |
1158 | ||
1159 | spin_unlock(&dev->req_lock); | |
1160 | usb_ep_free_request(link->out_ep, req); | |
1161 | spin_lock(&dev->req_lock); | |
1162 | } | |
1163 | spin_unlock(&dev->req_lock); | |
1164 | link->out_ep->driver_data = NULL; | |
72c973dd | 1165 | link->out_ep->desc = NULL; |
2b3d942c DB |
1166 | |
1167 | /* finish forgetting about this USB link episode */ | |
1168 | dev->header_len = 0; | |
1169 | dev->unwrap = NULL; | |
1170 | dev->wrap = NULL; | |
1171 | ||
1172 | spin_lock(&dev->lock); | |
1173 | dev->port_usb = NULL; | |
2b3d942c DB |
1174 | spin_unlock(&dev->lock); |
1175 | } | |
0700faaf | 1176 | EXPORT_SYMBOL_GPL(gether_disconnect); |
f1a1823f AP |
1177 | |
1178 | MODULE_LICENSE("GPL"); | |
1179 | MODULE_AUTHOR("David Brownell"); |