]>
Commit | Line | Data |
---|---|---|
ce6cde92 IPG |
1 | /* |
2 | * Intel Wireless WiMAX Connection 2400m | |
3 | * Glue with the networking stack | |
4 | * | |
5 | * | |
6 | * Copyright (C) 2007 Intel Corporation <linux-wimax@intel.com> | |
7 | * Yanir Lubetkin <yanirx.lubetkin@intel.com> | |
8 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License version | |
12 | * 2 as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
22 | * 02110-1301, USA. | |
23 | * | |
24 | * | |
25 | * This implements an ethernet device for the i2400m. | |
26 | * | |
27 | * We fake being an ethernet device to simplify the support from user | |
28 | * space and from the other side. The world is (sadly) configured to | |
29 | * take in only Ethernet devices... | |
30 | * | |
fd5c565c IPG |
31 | * Because of this, when using firmwares <= v1.3, there is an |
32 | * copy-each-rxed-packet overhead on the RX path. Each IP packet has | |
33 | * to be reallocated to add an ethernet header (as there is no space | |
34 | * in what we get from the device). This is a known drawback and | |
35 | * firmwares >= 1.4 add header space that can be used to insert the | |
36 | * ethernet header without having to reallocate and copy. | |
ce6cde92 IPG |
37 | * |
38 | * TX error handling is tricky; because we have to FIFO/queue the | |
39 | * buffers for transmission (as the hardware likes it aggregated), we | |
40 | * just give the skb to the TX subsystem and by the time it is | |
41 | * transmitted, we have long forgotten about it. So we just don't care | |
42 | * too much about it. | |
43 | * | |
44 | * Note that when the device is in idle mode with the basestation, we | |
45 | * need to negotiate coming back up online. That involves negotiation | |
46 | * and possible user space interaction. Thus, we defer to a workqueue | |
47 | * to do all that. By default, we only queue a single packet and drop | |
48 | * the rest, as potentially the time to go back from idle to normal is | |
49 | * long. | |
50 | * | |
51 | * ROADMAP | |
52 | * | |
53 | * i2400m_open Called on ifconfig up | |
54 | * i2400m_stop Called on ifconfig down | |
55 | * | |
56 | * i2400m_hard_start_xmit Called by the network stack to send a packet | |
57 | * i2400m_net_wake_tx Wake up device from basestation-IDLE & TX | |
58 | * i2400m_wake_tx_work | |
59 | * i2400m_cmd_exit_idle | |
60 | * i2400m_tx | |
61 | * i2400m_net_tx TX a data frame | |
62 | * i2400m_tx | |
63 | * | |
64 | * i2400m_change_mtu Called on ifconfig mtu XXX | |
65 | * | |
66 | * i2400m_tx_timeout Called when the device times out | |
67 | * | |
68 | * i2400m_net_rx Called by the RX code when a data frame is | |
fd5c565c IPG |
69 | * available (firmware <= 1.3) |
70 | * i2400m_net_erx Called by the RX code when a data frame is | |
71 | * available (firmware >= 1.4). | |
ce6cde92 IPG |
72 | * i2400m_netdev_setup Called to setup all the netdev stuff from |
73 | * alloc_netdev. | |
74 | */ | |
75 | #include <linux/if_arp.h> | |
5a0e3ad6 | 76 | #include <linux/slab.h> |
ce6cde92 | 77 | #include <linux/netdevice.h> |
abb30733 | 78 | #include <linux/ethtool.h> |
ee40fa06 | 79 | #include <linux/export.h> |
ce6cde92 IPG |
80 | #include "i2400m.h" |
81 | ||
82 | ||
83 | #define D_SUBMODULE netdev | |
84 | #include "debug-levels.h" | |
85 | ||
86 | enum { | |
87 | /* netdev interface */ | |
5ab5a721 IPG |
88 | /* 20 secs? yep, this is the maximum timeout that the device |
89 | * might take to get out of IDLE / negotiate it with the base | |
90 | * station. We add 1sec for good measure. */ | |
91 | I2400M_TX_TIMEOUT = 21 * HZ, | |
ded0fd62 PP |
92 | /* |
93 | * Experimentation has determined that, 20 to be a good value | |
94 | * for minimizing the jitter in the throughput. | |
95 | */ | |
96 | I2400M_TX_QLEN = 20, | |
ce6cde92 IPG |
97 | }; |
98 | ||
99 | ||
100 | static | |
101 | int i2400m_open(struct net_device *net_dev) | |
102 | { | |
103 | int result; | |
104 | struct i2400m *i2400m = net_dev_to_i2400m(net_dev); | |
105 | struct device *dev = i2400m_dev(i2400m); | |
106 | ||
107 | d_fnstart(3, dev, "(net_dev %p [i2400m %p])\n", net_dev, i2400m); | |
8f90f3ee IPG |
108 | /* Make sure we wait until init is complete... */ |
109 | mutex_lock(&i2400m->init_mutex); | |
110 | if (i2400m->updown) | |
ce6cde92 | 111 | result = 0; |
8f90f3ee IPG |
112 | else |
113 | result = -EBUSY; | |
114 | mutex_unlock(&i2400m->init_mutex); | |
ce6cde92 IPG |
115 | d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n", |
116 | net_dev, i2400m, result); | |
117 | return result; | |
118 | } | |
119 | ||
120 | ||
ce6cde92 IPG |
121 | static |
122 | int i2400m_stop(struct net_device *net_dev) | |
123 | { | |
124 | struct i2400m *i2400m = net_dev_to_i2400m(net_dev); | |
125 | struct device *dev = i2400m_dev(i2400m); | |
126 | ||
127 | d_fnstart(3, dev, "(net_dev %p [i2400m %p])\n", net_dev, i2400m); | |
ac53aed9 | 128 | i2400m_net_wake_stop(i2400m); |
ce6cde92 IPG |
129 | d_fnend(3, dev, "(net_dev %p [i2400m %p]) = 0\n", net_dev, i2400m); |
130 | return 0; | |
131 | } | |
132 | ||
133 | ||
134 | /* | |
135 | * Wake up the device and transmit a held SKB, then restart the net queue | |
136 | * | |
137 | * When the device goes into basestation-idle mode, we need to tell it | |
138 | * to exit that mode; it will negotiate with the base station, user | |
139 | * space may have to intervene to rehandshake crypto and then tell us | |
140 | * when it is ready to transmit the packet we have "queued". Still we | |
141 | * need to give it sometime after it reports being ok. | |
142 | * | |
143 | * On error, there is not much we can do. If the error was on TX, we | |
144 | * still wake the queue up to see if the next packet will be luckier. | |
145 | * | |
146 | * If _cmd_exit_idle() fails...well, it could be many things; most | |
147 | * commonly it is that something else took the device out of IDLE mode | |
148 | * (for example, the base station). In that case we get an -EILSEQ and | |
149 | * we are just going to ignore that one. If the device is back to | |
150 | * connected, then fine -- if it is someother state, the packet will | |
151 | * be dropped anyway. | |
152 | */ | |
153 | void i2400m_wake_tx_work(struct work_struct *ws) | |
154 | { | |
155 | int result; | |
156 | struct i2400m *i2400m = container_of(ws, struct i2400m, wake_tx_ws); | |
5ab5a721 | 157 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; |
ce6cde92 | 158 | struct device *dev = i2400m_dev(i2400m); |
23663c87 | 159 | struct sk_buff *skb; |
ce6cde92 IPG |
160 | unsigned long flags; |
161 | ||
162 | spin_lock_irqsave(&i2400m->tx_lock, flags); | |
163 | skb = i2400m->wake_tx_skb; | |
164 | i2400m->wake_tx_skb = NULL; | |
165 | spin_unlock_irqrestore(&i2400m->tx_lock, flags); | |
166 | ||
167 | d_fnstart(3, dev, "(ws %p i2400m %p skb %p)\n", ws, i2400m, skb); | |
168 | result = -EINVAL; | |
169 | if (skb == NULL) { | |
25985edc | 170 | dev_err(dev, "WAKE&TX: skb disappeared!\n"); |
ce6cde92 IPG |
171 | goto out_put; |
172 | } | |
5ab5a721 IPG |
173 | /* If we have, somehow, lost the connection after this was |
174 | * queued, don't do anything; this might be the device got | |
175 | * reset or just disconnected. */ | |
176 | if (unlikely(!netif_carrier_ok(net_dev))) | |
177 | goto out_kfree; | |
ce6cde92 IPG |
178 | result = i2400m_cmd_exit_idle(i2400m); |
179 | if (result == -EILSEQ) | |
180 | result = 0; | |
181 | if (result < 0) { | |
182 | dev_err(dev, "WAKE&TX: device didn't get out of idle: " | |
c931ceeb IPG |
183 | "%d - resetting\n", result); |
184 | i2400m_reset(i2400m, I2400M_RT_BUS); | |
185 | goto error; | |
ce6cde92 IPG |
186 | } |
187 | result = wait_event_timeout(i2400m->state_wq, | |
5ab5a721 IPG |
188 | i2400m->state != I2400M_SS_IDLE, |
189 | net_dev->watchdog_timeo - HZ/2); | |
ce6cde92 IPG |
190 | if (result == 0) |
191 | result = -ETIMEDOUT; | |
192 | if (result < 0) { | |
193 | dev_err(dev, "WAKE&TX: error waiting for device to exit IDLE: " | |
c931ceeb IPG |
194 | "%d - resetting\n", result); |
195 | i2400m_reset(i2400m, I2400M_RT_BUS); | |
ce6cde92 IPG |
196 | goto error; |
197 | } | |
198 | msleep(20); /* device still needs some time or it drops it */ | |
199 | result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA); | |
ce6cde92 | 200 | error: |
5ab5a721 IPG |
201 | netif_wake_queue(net_dev); |
202 | out_kfree: | |
ce6cde92 IPG |
203 | kfree_skb(skb); /* refcount transferred by _hard_start_xmit() */ |
204 | out_put: | |
205 | i2400m_put(i2400m); | |
206 | d_fnend(3, dev, "(ws %p i2400m %p skb %p) = void [%d]\n", | |
207 | ws, i2400m, skb, result); | |
208 | } | |
209 | ||
210 | ||
211 | /* | |
212 | * Prepare the data payload TX header | |
213 | * | |
214 | * The i2400m expects a 4 byte header in front of a data packet. | |
215 | * | |
216 | * Because we pretend to be an ethernet device, this packet comes with | |
217 | * an ethernet header. Pull it and push our header. | |
218 | */ | |
219 | static | |
220 | void i2400m_tx_prep_header(struct sk_buff *skb) | |
221 | { | |
222 | struct i2400m_pl_data_hdr *pl_hdr; | |
223 | skb_pull(skb, ETH_HLEN); | |
d58ff351 | 224 | pl_hdr = skb_push(skb, sizeof(*pl_hdr)); |
ce6cde92 IPG |
225 | pl_hdr->reserved = 0; |
226 | } | |
227 | ||
228 | ||
ac53aed9 IPG |
229 | |
230 | /* | |
231 | * Cleanup resources acquired during i2400m_net_wake_tx() | |
232 | * | |
233 | * This is called by __i2400m_dev_stop and means we have to make sure | |
234 | * the workqueue is flushed from any pending work. | |
235 | */ | |
236 | void i2400m_net_wake_stop(struct i2400m *i2400m) | |
237 | { | |
238 | struct device *dev = i2400m_dev(i2400m); | |
23663c87 TH |
239 | struct sk_buff *wake_tx_skb; |
240 | unsigned long flags; | |
ac53aed9 IPG |
241 | |
242 | d_fnstart(3, dev, "(i2400m %p)\n", i2400m); | |
23663c87 TH |
243 | /* |
244 | * See i2400m_hard_start_xmit(), references are taken there and | |
245 | * here we release them if the packet was still pending. | |
246 | */ | |
247 | cancel_work_sync(&i2400m->wake_tx_ws); | |
248 | ||
249 | spin_lock_irqsave(&i2400m->tx_lock, flags); | |
250 | wake_tx_skb = i2400m->wake_tx_skb; | |
251 | i2400m->wake_tx_skb = NULL; | |
252 | spin_unlock_irqrestore(&i2400m->tx_lock, flags); | |
253 | ||
254 | if (wake_tx_skb) { | |
ac53aed9 IPG |
255 | i2400m_put(i2400m); |
256 | kfree_skb(wake_tx_skb); | |
257 | } | |
23663c87 | 258 | |
ac53aed9 | 259 | d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); |
ac53aed9 IPG |
260 | } |
261 | ||
262 | ||
ce6cde92 IPG |
263 | /* |
264 | * TX an skb to an idle device | |
265 | * | |
266 | * When the device is in basestation-idle mode, we need to wake it up | |
267 | * and then TX. So we queue a work_struct for doing so. | |
268 | * | |
269 | * We need to get an extra ref for the skb (so it is not dropped), as | |
270 | * well as be careful not to queue more than one request (won't help | |
271 | * at all). If more than one request comes or there are errors, we | |
272 | * just drop the packets (see i2400m_hard_start_xmit()). | |
273 | */ | |
274 | static | |
275 | int i2400m_net_wake_tx(struct i2400m *i2400m, struct net_device *net_dev, | |
276 | struct sk_buff *skb) | |
277 | { | |
278 | int result; | |
279 | struct device *dev = i2400m_dev(i2400m); | |
280 | unsigned long flags; | |
281 | ||
282 | d_fnstart(3, dev, "(skb %p net_dev %p)\n", skb, net_dev); | |
283 | if (net_ratelimit()) { | |
284 | d_printf(3, dev, "WAKE&NETTX: " | |
285 | "skb %p sending %d bytes to radio\n", | |
286 | skb, skb->len); | |
287 | d_dump(4, dev, skb->data, skb->len); | |
288 | } | |
289 | /* We hold a ref count for i2400m and skb, so when | |
290 | * stopping() the device, we need to cancel that work | |
291 | * and if pending, release those resources. */ | |
292 | result = 0; | |
293 | spin_lock_irqsave(&i2400m->tx_lock, flags); | |
23663c87 | 294 | if (!i2400m->wake_tx_skb) { |
ce6cde92 IPG |
295 | netif_stop_queue(net_dev); |
296 | i2400m_get(i2400m); | |
297 | i2400m->wake_tx_skb = skb_get(skb); /* transfer ref count */ | |
298 | i2400m_tx_prep_header(skb); | |
299 | result = schedule_work(&i2400m->wake_tx_ws); | |
300 | WARN_ON(result == 0); | |
301 | } | |
302 | spin_unlock_irqrestore(&i2400m->tx_lock, flags); | |
303 | if (result == 0) { | |
304 | /* Yes, this happens even if we stopped the | |
305 | * queue -- blame the queue disciplines that | |
306 | * queue without looking -- I guess there is a reason | |
307 | * for that. */ | |
308 | if (net_ratelimit()) | |
309 | d_printf(1, dev, "NETTX: device exiting idle, " | |
310 | "dropping skb %p, queue running %d\n", | |
311 | skb, netif_queue_stopped(net_dev)); | |
312 | result = -EBUSY; | |
313 | } | |
314 | d_fnend(3, dev, "(skb %p net_dev %p) = %d\n", skb, net_dev, result); | |
315 | return result; | |
316 | } | |
317 | ||
318 | ||
319 | /* | |
320 | * Transmit a packet to the base station on behalf of the network stack. | |
321 | * | |
322 | * Returns: 0 if ok, < 0 errno code on error. | |
323 | * | |
324 | * We need to pull the ethernet header and add the hardware header, | |
325 | * which is currently set to all zeroes and reserved. | |
326 | */ | |
327 | static | |
328 | int i2400m_net_tx(struct i2400m *i2400m, struct net_device *net_dev, | |
329 | struct sk_buff *skb) | |
330 | { | |
331 | int result; | |
332 | struct device *dev = i2400m_dev(i2400m); | |
333 | ||
334 | d_fnstart(3, dev, "(i2400m %p net_dev %p skb %p)\n", | |
335 | i2400m, net_dev, skb); | |
336 | /* FIXME: check eth hdr, only IPv4 is routed by the device as of now */ | |
860e9538 | 337 | netif_trans_update(net_dev); |
ce6cde92 IPG |
338 | i2400m_tx_prep_header(skb); |
339 | d_printf(3, dev, "NETTX: skb %p sending %d bytes to radio\n", | |
340 | skb, skb->len); | |
341 | d_dump(4, dev, skb->data, skb->len); | |
342 | result = i2400m_tx(i2400m, skb->data, skb->len, I2400M_PT_DATA); | |
343 | d_fnend(3, dev, "(i2400m %p net_dev %p skb %p) = %d\n", | |
344 | i2400m, net_dev, skb, result); | |
345 | return result; | |
346 | } | |
347 | ||
348 | ||
349 | /* | |
350 | * Transmit a packet to the base station on behalf of the network stack | |
351 | * | |
352 | * | |
353 | * Returns: NETDEV_TX_OK (always, even in case of error) | |
354 | * | |
355 | * In case of error, we just drop it. Reasons: | |
356 | * | |
357 | * - we add a hw header to each skb, and if the network stack | |
358 | * retries, we have no way to know if that skb has it or not. | |
359 | * | |
360 | * - network protocols have their own drop-recovery mechanisms | |
361 | * | |
362 | * - there is not much else we can do | |
363 | * | |
364 | * If the device is idle, we need to wake it up; that is an operation | |
365 | * that will sleep. See i2400m_net_wake_tx() for details. | |
366 | */ | |
367 | static | |
d0cf9c0d SH |
368 | netdev_tx_t i2400m_hard_start_xmit(struct sk_buff *skb, |
369 | struct net_device *net_dev) | |
ce6cde92 | 370 | { |
ce6cde92 IPG |
371 | struct i2400m *i2400m = net_dev_to_i2400m(net_dev); |
372 | struct device *dev = i2400m_dev(i2400m); | |
b8fbaef5 | 373 | int result = -1; |
ce6cde92 IPG |
374 | |
375 | d_fnstart(3, dev, "(skb %p net_dev %p)\n", skb, net_dev); | |
b8fbaef5 | 376 | |
b06626b8 | 377 | if (skb_cow_head(skb, 0)) |
b8fbaef5 | 378 | goto drop; |
9835fd84 | 379 | |
ce6cde92 IPG |
380 | if (i2400m->state == I2400M_SS_IDLE) |
381 | result = i2400m_net_wake_tx(i2400m, net_dev, skb); | |
382 | else | |
383 | result = i2400m_net_tx(i2400m, net_dev, skb); | |
b8fbaef5 ED |
384 | if (result < 0) { |
385 | drop: | |
ce6cde92 | 386 | net_dev->stats.tx_dropped++; |
b8fbaef5 | 387 | } else { |
ce6cde92 IPG |
388 | net_dev->stats.tx_packets++; |
389 | net_dev->stats.tx_bytes += skb->len; | |
390 | } | |
b8fbaef5 | 391 | dev_kfree_skb(skb); |
9835fd84 | 392 | d_fnend(3, dev, "(skb %p net_dev %p) = %d\n", skb, net_dev, result); |
b8fbaef5 | 393 | return NETDEV_TX_OK; |
ce6cde92 IPG |
394 | } |
395 | ||
396 | ||
ce6cde92 IPG |
397 | static |
398 | void i2400m_tx_timeout(struct net_device *net_dev) | |
399 | { | |
400 | /* | |
401 | * We might want to kick the device | |
402 | * | |
403 | * There is not much we can do though, as the device requires | |
404 | * that we send the data aggregated. By the time we receive | |
405 | * this, there might be data pending to be sent or not... | |
406 | */ | |
407 | net_dev->stats.tx_errors++; | |
ce6cde92 IPG |
408 | } |
409 | ||
410 | ||
411 | /* | |
412 | * Create a fake ethernet header | |
413 | * | |
414 | * For emulating an ethernet device, every received IP header has to | |
fd5c565c IPG |
415 | * be prefixed with an ethernet header. Fake it with the given |
416 | * protocol. | |
ce6cde92 IPG |
417 | */ |
418 | static | |
419 | void i2400m_rx_fake_eth_header(struct net_device *net_dev, | |
61b8d268 | 420 | void *_eth_hdr, __be16 protocol) |
ce6cde92 | 421 | { |
fe442683 | 422 | struct i2400m *i2400m = net_dev_to_i2400m(net_dev); |
ce6cde92 IPG |
423 | struct ethhdr *eth_hdr = _eth_hdr; |
424 | ||
425 | memcpy(eth_hdr->h_dest, net_dev->dev_addr, sizeof(eth_hdr->h_dest)); | |
fe442683 IPG |
426 | memcpy(eth_hdr->h_source, i2400m->src_mac_addr, |
427 | sizeof(eth_hdr->h_source)); | |
61b8d268 | 428 | eth_hdr->h_proto = protocol; |
ce6cde92 IPG |
429 | } |
430 | ||
431 | ||
432 | /* | |
433 | * i2400m_net_rx - pass a network packet to the stack | |
434 | * | |
435 | * @i2400m: device instance | |
436 | * @skb_rx: the skb where the buffer pointed to by @buf is | |
437 | * @i: 1 if payload is the only one | |
438 | * @buf: pointer to the buffer containing the data | |
439 | * @len: buffer's length | |
440 | * | |
fd5c565c IPG |
441 | * This is only used now for the v1.3 firmware. It will be deprecated |
442 | * in >= 2.6.31. | |
443 | * | |
444 | * Note that due to firmware limitations, we don't have space to add | |
445 | * an ethernet header, so we need to copy each packet. Firmware | |
446 | * versions >= v1.4 fix this [see i2400m_net_erx()]. | |
447 | * | |
ce6cde92 IPG |
448 | * We just clone the skb and set it up so that it's skb->data pointer |
449 | * points to "buf" and it's length. | |
450 | * | |
451 | * Note that if the payload is the last (or the only one) in a | |
452 | * multi-payload message, we don't clone the SKB but just reuse it. | |
453 | * | |
454 | * This function is normally run from a thread context. However, we | |
455 | * still use netif_rx() instead of netif_receive_skb() as was | |
456 | * recommended in the mailing list. Reason is in some stress tests | |
457 | * when sending/receiving a lot of data we seem to hit a softlock in | |
458 | * the kernel's TCP implementation [aroudn tcp_delay_timer()]. Using | |
459 | * netif_rx() took care of the issue. | |
460 | * | |
461 | * This is, of course, still open to do more research on why running | |
462 | * with netif_receive_skb() hits this softlock. FIXME. | |
463 | * | |
464 | * FIXME: currently we don't do any efforts at distinguishing if what | |
465 | * we got was an IPv4 or IPv6 header, to setup the protocol field | |
466 | * correctly. | |
467 | */ | |
468 | void i2400m_net_rx(struct i2400m *i2400m, struct sk_buff *skb_rx, | |
469 | unsigned i, const void *buf, int buf_len) | |
470 | { | |
471 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; | |
472 | struct device *dev = i2400m_dev(i2400m); | |
473 | struct sk_buff *skb; | |
474 | ||
475 | d_fnstart(2, dev, "(i2400m %p buf %p buf_len %d)\n", | |
476 | i2400m, buf, buf_len); | |
477 | if (i) { | |
478 | skb = skb_get(skb_rx); | |
479 | d_printf(2, dev, "RX: reusing first payload skb %p\n", skb); | |
480 | skb_pull(skb, buf - (void *) skb->data); | |
481 | skb_trim(skb, (void *) skb_end_pointer(skb) - buf); | |
482 | } else { | |
483 | /* Yes, this is bad -- a lot of overhead -- see | |
484 | * comments at the top of the file */ | |
485 | skb = __netdev_alloc_skb(net_dev, buf_len, GFP_KERNEL); | |
486 | if (skb == NULL) { | |
487 | dev_err(dev, "NETRX: no memory to realloc skb\n"); | |
488 | net_dev->stats.rx_dropped++; | |
489 | goto error_skb_realloc; | |
490 | } | |
59ae1d12 | 491 | skb_put_data(skb, buf, buf_len); |
ce6cde92 IPG |
492 | } |
493 | i2400m_rx_fake_eth_header(i2400m->wimax_dev.net_dev, | |
61b8d268 HH |
494 | skb->data - ETH_HLEN, |
495 | cpu_to_be16(ETH_P_IP)); | |
ce6cde92 IPG |
496 | skb_set_mac_header(skb, -ETH_HLEN); |
497 | skb->dev = i2400m->wimax_dev.net_dev; | |
498 | skb->protocol = htons(ETH_P_IP); | |
499 | net_dev->stats.rx_packets++; | |
500 | net_dev->stats.rx_bytes += buf_len; | |
501 | d_printf(3, dev, "NETRX: receiving %d bytes to network stack\n", | |
502 | buf_len); | |
503 | d_dump(4, dev, buf, buf_len); | |
504 | netif_rx_ni(skb); /* see notes in function header */ | |
505 | error_skb_realloc: | |
506 | d_fnend(2, dev, "(i2400m %p buf %p buf_len %d) = void\n", | |
507 | i2400m, buf, buf_len); | |
508 | } | |
509 | ||
fd5c565c IPG |
510 | |
511 | /* | |
512 | * i2400m_net_erx - pass a network packet to the stack (extended version) | |
513 | * | |
514 | * @i2400m: device descriptor | |
515 | * @skb: the skb where the packet is - the skb should be set to point | |
516 | * at the IP packet; this function will add ethernet headers if | |
517 | * needed. | |
518 | * @cs: packet type | |
519 | * | |
520 | * This is only used now for firmware >= v1.4. Note it is quite | |
521 | * similar to i2400m_net_rx() (used only for v1.3 firmware). | |
522 | * | |
523 | * This function is normally run from a thread context. However, we | |
524 | * still use netif_rx() instead of netif_receive_skb() as was | |
525 | * recommended in the mailing list. Reason is in some stress tests | |
526 | * when sending/receiving a lot of data we seem to hit a softlock in | |
527 | * the kernel's TCP implementation [aroudn tcp_delay_timer()]. Using | |
528 | * netif_rx() took care of the issue. | |
529 | * | |
530 | * This is, of course, still open to do more research on why running | |
531 | * with netif_receive_skb() hits this softlock. FIXME. | |
532 | */ | |
533 | void i2400m_net_erx(struct i2400m *i2400m, struct sk_buff *skb, | |
534 | enum i2400m_cs cs) | |
535 | { | |
536 | struct net_device *net_dev = i2400m->wimax_dev.net_dev; | |
537 | struct device *dev = i2400m_dev(i2400m); | |
538 | int protocol; | |
539 | ||
ff5e2b47 | 540 | d_fnstart(2, dev, "(i2400m %p skb %p [%u] cs %d)\n", |
fd5c565c IPG |
541 | i2400m, skb, skb->len, cs); |
542 | switch(cs) { | |
543 | case I2400M_CS_IPV4_0: | |
544 | case I2400M_CS_IPV4: | |
545 | protocol = ETH_P_IP; | |
546 | i2400m_rx_fake_eth_header(i2400m->wimax_dev.net_dev, | |
61b8d268 HH |
547 | skb->data - ETH_HLEN, |
548 | cpu_to_be16(ETH_P_IP)); | |
fd5c565c IPG |
549 | skb_set_mac_header(skb, -ETH_HLEN); |
550 | skb->dev = i2400m->wimax_dev.net_dev; | |
551 | skb->protocol = htons(ETH_P_IP); | |
552 | net_dev->stats.rx_packets++; | |
553 | net_dev->stats.rx_bytes += skb->len; | |
554 | break; | |
555 | default: | |
556 | dev_err(dev, "ERX: BUG? CS type %u unsupported\n", cs); | |
557 | goto error; | |
558 | ||
559 | } | |
560 | d_printf(3, dev, "ERX: receiving %d bytes to the network stack\n", | |
561 | skb->len); | |
562 | d_dump(4, dev, skb->data, skb->len); | |
563 | netif_rx_ni(skb); /* see notes in function header */ | |
564 | error: | |
ff5e2b47 | 565 | d_fnend(2, dev, "(i2400m %p skb %p [%u] cs %d) = void\n", |
fd5c565c IPG |
566 | i2400m, skb, skb->len, cs); |
567 | } | |
568 | ||
a962dc25 IPG |
569 | static const struct net_device_ops i2400m_netdev_ops = { |
570 | .ndo_open = i2400m_open, | |
571 | .ndo_stop = i2400m_stop, | |
572 | .ndo_start_xmit = i2400m_hard_start_xmit, | |
573 | .ndo_tx_timeout = i2400m_tx_timeout, | |
a962dc25 IPG |
574 | }; |
575 | ||
abb30733 DW |
576 | static void i2400m_get_drvinfo(struct net_device *net_dev, |
577 | struct ethtool_drvinfo *info) | |
578 | { | |
579 | struct i2400m *i2400m = net_dev_to_i2400m(net_dev); | |
580 | ||
7826d43f JP |
581 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); |
582 | strlcpy(info->fw_version, i2400m->fw_name ? : "", | |
583 | sizeof(info->fw_version)); | |
abb30733 | 584 | if (net_dev->dev.parent) |
7826d43f JP |
585 | strlcpy(info->bus_info, dev_name(net_dev->dev.parent), |
586 | sizeof(info->bus_info)); | |
abb30733 DW |
587 | } |
588 | ||
589 | static const struct ethtool_ops i2400m_ethtool_ops = { | |
590 | .get_drvinfo = i2400m_get_drvinfo, | |
591 | .get_link = ethtool_op_get_link, | |
592 | }; | |
ce6cde92 IPG |
593 | |
594 | /** | |
595 | * i2400m_netdev_setup - Setup setup @net_dev's i2400m private data | |
596 | * | |
597 | * Called by alloc_netdev() | |
598 | */ | |
599 | void i2400m_netdev_setup(struct net_device *net_dev) | |
600 | { | |
601 | d_fnstart(3, NULL, "(net_dev %p)\n", net_dev); | |
602 | ether_setup(net_dev); | |
603 | net_dev->mtu = I2400M_MAX_MTU; | |
9c22b4a3 JW |
604 | net_dev->min_mtu = 0; |
605 | net_dev->max_mtu = I2400M_MAX_MTU; | |
ce6cde92 IPG |
606 | net_dev->tx_queue_len = I2400M_TX_QLEN; |
607 | net_dev->features = | |
608 | NETIF_F_VLAN_CHALLENGED | |
609 | | NETIF_F_HIGHDMA; | |
610 | net_dev->flags = | |
611 | IFF_NOARP /* i2400m is apure IP device */ | |
612 | & (~IFF_BROADCAST /* i2400m is P2P */ | |
613 | & ~IFF_MULTICAST); | |
614 | net_dev->watchdog_timeo = I2400M_TX_TIMEOUT; | |
a962dc25 | 615 | net_dev->netdev_ops = &i2400m_netdev_ops; |
abb30733 | 616 | net_dev->ethtool_ops = &i2400m_ethtool_ops; |
ce6cde92 IPG |
617 | d_fnend(3, NULL, "(net_dev %p) = void\n", net_dev); |
618 | } | |
619 | EXPORT_SYMBOL_GPL(i2400m_netdev_setup); | |
620 |