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8ceee660 BH |
1 | /**************************************************************************** |
2 | * Driver for Solarflare Solarstorm network controllers and boards | |
3 | * Copyright 2005-2006 Fen Systems Ltd. | |
4 | * Copyright 2005-2008 Solarflare Communications Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation, incorporated herein by reference. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/notifier.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/tcp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/crc32.h> | |
21 | #include <linux/ethtool.h> | |
22 | #include "net_driver.h" | |
23 | #include "gmii.h" | |
24 | #include "ethtool.h" | |
25 | #include "tx.h" | |
26 | #include "rx.h" | |
27 | #include "efx.h" | |
28 | #include "mdio_10g.h" | |
29 | #include "falcon.h" | |
30 | #include "workarounds.h" | |
31 | #include "mac.h" | |
32 | ||
33 | #define EFX_MAX_MTU (9 * 1024) | |
34 | ||
35 | /* RX slow fill workqueue. If memory allocation fails in the fast path, | |
36 | * a work item is pushed onto this work queue to retry the allocation later, | |
37 | * to avoid the NIC being starved of RX buffers. Since this is a per cpu | |
38 | * workqueue, there is nothing to be gained in making it per NIC | |
39 | */ | |
40 | static struct workqueue_struct *refill_workqueue; | |
41 | ||
42 | /************************************************************************** | |
43 | * | |
44 | * Configurable values | |
45 | * | |
46 | *************************************************************************/ | |
47 | ||
48 | /* | |
49 | * Enable large receive offload (LRO) aka soft segment reassembly (SSR) | |
50 | * | |
51 | * This sets the default for new devices. It can be controlled later | |
52 | * using ethtool. | |
53 | */ | |
54 | static int lro = 1; | |
55 | module_param(lro, int, 0644); | |
56 | MODULE_PARM_DESC(lro, "Large receive offload acceleration"); | |
57 | ||
58 | /* | |
59 | * Use separate channels for TX and RX events | |
60 | * | |
61 | * Set this to 1 to use separate channels for TX and RX. It allows us to | |
62 | * apply a higher level of interrupt moderation to TX events. | |
63 | * | |
64 | * This is forced to 0 for MSI interrupt mode as the interrupt vector | |
65 | * is not written | |
66 | */ | |
67 | static unsigned int separate_tx_and_rx_channels = 1; | |
68 | ||
69 | /* This is the weight assigned to each of the (per-channel) virtual | |
70 | * NAPI devices. | |
71 | */ | |
72 | static int napi_weight = 64; | |
73 | ||
74 | /* This is the time (in jiffies) between invocations of the hardware | |
75 | * monitor, which checks for known hardware bugs and resets the | |
76 | * hardware and driver as necessary. | |
77 | */ | |
78 | unsigned int efx_monitor_interval = 1 * HZ; | |
79 | ||
80 | /* This controls whether or not the hardware monitor will trigger a | |
81 | * reset when it detects an error condition. | |
82 | */ | |
83 | static unsigned int monitor_reset = 1; | |
84 | ||
85 | /* This controls whether or not the driver will initialise devices | |
86 | * with invalid MAC addresses stored in the EEPROM or flash. If true, | |
87 | * such devices will be initialised with a random locally-generated | |
88 | * MAC address. This allows for loading the sfc_mtd driver to | |
89 | * reprogram the flash, even if the flash contents (including the MAC | |
90 | * address) have previously been erased. | |
91 | */ | |
92 | static unsigned int allow_bad_hwaddr; | |
93 | ||
94 | /* Initial interrupt moderation settings. They can be modified after | |
95 | * module load with ethtool. | |
96 | * | |
97 | * The default for RX should strike a balance between increasing the | |
98 | * round-trip latency and reducing overhead. | |
99 | */ | |
100 | static unsigned int rx_irq_mod_usec = 60; | |
101 | ||
102 | /* Initial interrupt moderation settings. They can be modified after | |
103 | * module load with ethtool. | |
104 | * | |
105 | * This default is chosen to ensure that a 10G link does not go idle | |
106 | * while a TX queue is stopped after it has become full. A queue is | |
107 | * restarted when it drops below half full. The time this takes (assuming | |
108 | * worst case 3 descriptors per packet and 1024 descriptors) is | |
109 | * 512 / 3 * 1.2 = 205 usec. | |
110 | */ | |
111 | static unsigned int tx_irq_mod_usec = 150; | |
112 | ||
113 | /* This is the first interrupt mode to try out of: | |
114 | * 0 => MSI-X | |
115 | * 1 => MSI | |
116 | * 2 => legacy | |
117 | */ | |
118 | static unsigned int interrupt_mode; | |
119 | ||
120 | /* This is the requested number of CPUs to use for Receive-Side Scaling (RSS), | |
121 | * i.e. the number of CPUs among which we may distribute simultaneous | |
122 | * interrupt handling. | |
123 | * | |
124 | * Cards without MSI-X will only target one CPU via legacy or MSI interrupt. | |
125 | * The default (0) means to assign an interrupt to each package (level II cache) | |
126 | */ | |
127 | static unsigned int rss_cpus; | |
128 | module_param(rss_cpus, uint, 0444); | |
129 | MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling"); | |
130 | ||
131 | /************************************************************************** | |
132 | * | |
133 | * Utility functions and prototypes | |
134 | * | |
135 | *************************************************************************/ | |
136 | static void efx_remove_channel(struct efx_channel *channel); | |
137 | static void efx_remove_port(struct efx_nic *efx); | |
138 | static void efx_fini_napi(struct efx_nic *efx); | |
139 | static void efx_fini_channels(struct efx_nic *efx); | |
140 | ||
141 | #define EFX_ASSERT_RESET_SERIALISED(efx) \ | |
142 | do { \ | |
143 | if ((efx->state == STATE_RUNNING) || \ | |
144 | (efx->state == STATE_RESETTING)) \ | |
145 | ASSERT_RTNL(); \ | |
146 | } while (0) | |
147 | ||
148 | /************************************************************************** | |
149 | * | |
150 | * Event queue processing | |
151 | * | |
152 | *************************************************************************/ | |
153 | ||
154 | /* Process channel's event queue | |
155 | * | |
156 | * This function is responsible for processing the event queue of a | |
157 | * single channel. The caller must guarantee that this function will | |
158 | * never be concurrently called more than once on the same channel, | |
159 | * though different channels may be being processed concurrently. | |
160 | */ | |
161 | static inline int efx_process_channel(struct efx_channel *channel, int rx_quota) | |
162 | { | |
163 | int rxdmaqs; | |
164 | struct efx_rx_queue *rx_queue; | |
165 | ||
166 | if (unlikely(channel->efx->reset_pending != RESET_TYPE_NONE || | |
167 | !channel->enabled)) | |
168 | return rx_quota; | |
169 | ||
170 | rxdmaqs = falcon_process_eventq(channel, &rx_quota); | |
171 | ||
172 | /* Deliver last RX packet. */ | |
173 | if (channel->rx_pkt) { | |
174 | __efx_rx_packet(channel, channel->rx_pkt, | |
175 | channel->rx_pkt_csummed); | |
176 | channel->rx_pkt = NULL; | |
177 | } | |
178 | ||
179 | efx_flush_lro(channel); | |
180 | efx_rx_strategy(channel); | |
181 | ||
182 | /* Refill descriptor rings as necessary */ | |
183 | rx_queue = &channel->efx->rx_queue[0]; | |
184 | while (rxdmaqs) { | |
185 | if (rxdmaqs & 0x01) | |
186 | efx_fast_push_rx_descriptors(rx_queue); | |
187 | rx_queue++; | |
188 | rxdmaqs >>= 1; | |
189 | } | |
190 | ||
191 | return rx_quota; | |
192 | } | |
193 | ||
194 | /* Mark channel as finished processing | |
195 | * | |
196 | * Note that since we will not receive further interrupts for this | |
197 | * channel before we finish processing and call the eventq_read_ack() | |
198 | * method, there is no need to use the interrupt hold-off timers. | |
199 | */ | |
200 | static inline void efx_channel_processed(struct efx_channel *channel) | |
201 | { | |
5b9e207c BH |
202 | /* The interrupt handler for this channel may set work_pending |
203 | * as soon as we acknowledge the events we've seen. Make sure | |
204 | * it's cleared before then. */ | |
8ceee660 | 205 | channel->work_pending = 0; |
5b9e207c BH |
206 | smp_wmb(); |
207 | ||
8ceee660 BH |
208 | falcon_eventq_read_ack(channel); |
209 | } | |
210 | ||
211 | /* NAPI poll handler | |
212 | * | |
213 | * NAPI guarantees serialisation of polls of the same device, which | |
214 | * provides the guarantee required by efx_process_channel(). | |
215 | */ | |
216 | static int efx_poll(struct napi_struct *napi, int budget) | |
217 | { | |
218 | struct efx_channel *channel = | |
219 | container_of(napi, struct efx_channel, napi_str); | |
220 | struct net_device *napi_dev = channel->napi_dev; | |
221 | int unused; | |
222 | int rx_packets; | |
223 | ||
224 | EFX_TRACE(channel->efx, "channel %d NAPI poll executing on CPU %d\n", | |
225 | channel->channel, raw_smp_processor_id()); | |
226 | ||
227 | unused = efx_process_channel(channel, budget); | |
228 | rx_packets = (budget - unused); | |
229 | ||
230 | if (rx_packets < budget) { | |
231 | /* There is no race here; although napi_disable() will | |
232 | * only wait for netif_rx_complete(), this isn't a problem | |
233 | * since efx_channel_processed() will have no effect if | |
234 | * interrupts have already been disabled. | |
235 | */ | |
236 | netif_rx_complete(napi_dev, napi); | |
237 | efx_channel_processed(channel); | |
238 | } | |
239 | ||
240 | return rx_packets; | |
241 | } | |
242 | ||
243 | /* Process the eventq of the specified channel immediately on this CPU | |
244 | * | |
245 | * Disable hardware generated interrupts, wait for any existing | |
246 | * processing to finish, then directly poll (and ack ) the eventq. | |
247 | * Finally reenable NAPI and interrupts. | |
248 | * | |
249 | * Since we are touching interrupts the caller should hold the suspend lock | |
250 | */ | |
251 | void efx_process_channel_now(struct efx_channel *channel) | |
252 | { | |
253 | struct efx_nic *efx = channel->efx; | |
254 | ||
255 | BUG_ON(!channel->used_flags); | |
256 | BUG_ON(!channel->enabled); | |
257 | ||
258 | /* Disable interrupts and wait for ISRs to complete */ | |
259 | falcon_disable_interrupts(efx); | |
260 | if (efx->legacy_irq) | |
261 | synchronize_irq(efx->legacy_irq); | |
262 | if (channel->has_interrupt && channel->irq) | |
263 | synchronize_irq(channel->irq); | |
264 | ||
265 | /* Wait for any NAPI processing to complete */ | |
266 | napi_disable(&channel->napi_str); | |
267 | ||
268 | /* Poll the channel */ | |
91ad757c | 269 | efx_process_channel(channel, efx->type->evq_size); |
8ceee660 BH |
270 | |
271 | /* Ack the eventq. This may cause an interrupt to be generated | |
272 | * when they are reenabled */ | |
273 | efx_channel_processed(channel); | |
274 | ||
275 | napi_enable(&channel->napi_str); | |
276 | falcon_enable_interrupts(efx); | |
277 | } | |
278 | ||
279 | /* Create event queue | |
280 | * Event queue memory allocations are done only once. If the channel | |
281 | * is reset, the memory buffer will be reused; this guards against | |
282 | * errors during channel reset and also simplifies interrupt handling. | |
283 | */ | |
284 | static int efx_probe_eventq(struct efx_channel *channel) | |
285 | { | |
286 | EFX_LOG(channel->efx, "chan %d create event queue\n", channel->channel); | |
287 | ||
288 | return falcon_probe_eventq(channel); | |
289 | } | |
290 | ||
291 | /* Prepare channel's event queue */ | |
292 | static int efx_init_eventq(struct efx_channel *channel) | |
293 | { | |
294 | EFX_LOG(channel->efx, "chan %d init event queue\n", channel->channel); | |
295 | ||
296 | channel->eventq_read_ptr = 0; | |
297 | ||
298 | return falcon_init_eventq(channel); | |
299 | } | |
300 | ||
301 | static void efx_fini_eventq(struct efx_channel *channel) | |
302 | { | |
303 | EFX_LOG(channel->efx, "chan %d fini event queue\n", channel->channel); | |
304 | ||
305 | falcon_fini_eventq(channel); | |
306 | } | |
307 | ||
308 | static void efx_remove_eventq(struct efx_channel *channel) | |
309 | { | |
310 | EFX_LOG(channel->efx, "chan %d remove event queue\n", channel->channel); | |
311 | ||
312 | falcon_remove_eventq(channel); | |
313 | } | |
314 | ||
315 | /************************************************************************** | |
316 | * | |
317 | * Channel handling | |
318 | * | |
319 | *************************************************************************/ | |
320 | ||
8ceee660 BH |
321 | static int efx_probe_channel(struct efx_channel *channel) |
322 | { | |
323 | struct efx_tx_queue *tx_queue; | |
324 | struct efx_rx_queue *rx_queue; | |
325 | int rc; | |
326 | ||
327 | EFX_LOG(channel->efx, "creating channel %d\n", channel->channel); | |
328 | ||
329 | rc = efx_probe_eventq(channel); | |
330 | if (rc) | |
331 | goto fail1; | |
332 | ||
333 | efx_for_each_channel_tx_queue(tx_queue, channel) { | |
334 | rc = efx_probe_tx_queue(tx_queue); | |
335 | if (rc) | |
336 | goto fail2; | |
337 | } | |
338 | ||
339 | efx_for_each_channel_rx_queue(rx_queue, channel) { | |
340 | rc = efx_probe_rx_queue(rx_queue); | |
341 | if (rc) | |
342 | goto fail3; | |
343 | } | |
344 | ||
345 | channel->n_rx_frm_trunc = 0; | |
346 | ||
347 | return 0; | |
348 | ||
349 | fail3: | |
350 | efx_for_each_channel_rx_queue(rx_queue, channel) | |
351 | efx_remove_rx_queue(rx_queue); | |
352 | fail2: | |
353 | efx_for_each_channel_tx_queue(tx_queue, channel) | |
354 | efx_remove_tx_queue(tx_queue); | |
355 | fail1: | |
356 | return rc; | |
357 | } | |
358 | ||
359 | ||
360 | /* Channels are shutdown and reinitialised whilst the NIC is running | |
361 | * to propagate configuration changes (mtu, checksum offload), or | |
362 | * to clear hardware error conditions | |
363 | */ | |
364 | static int efx_init_channels(struct efx_nic *efx) | |
365 | { | |
366 | struct efx_tx_queue *tx_queue; | |
367 | struct efx_rx_queue *rx_queue; | |
368 | struct efx_channel *channel; | |
369 | int rc = 0; | |
370 | ||
f7f13b0b BH |
371 | /* Calculate the rx buffer allocation parameters required to |
372 | * support the current MTU, including padding for header | |
373 | * alignment and overruns. | |
374 | */ | |
375 | efx->rx_buffer_len = (max(EFX_PAGE_IP_ALIGN, NET_IP_ALIGN) + | |
376 | EFX_MAX_FRAME_LEN(efx->net_dev->mtu) + | |
377 | efx->type->rx_buffer_padding); | |
378 | efx->rx_buffer_order = get_order(efx->rx_buffer_len); | |
8ceee660 BH |
379 | |
380 | /* Initialise the channels */ | |
381 | efx_for_each_channel(channel, efx) { | |
382 | EFX_LOG(channel->efx, "init chan %d\n", channel->channel); | |
383 | ||
384 | rc = efx_init_eventq(channel); | |
385 | if (rc) | |
386 | goto err; | |
387 | ||
388 | efx_for_each_channel_tx_queue(tx_queue, channel) { | |
389 | rc = efx_init_tx_queue(tx_queue); | |
390 | if (rc) | |
391 | goto err; | |
392 | } | |
393 | ||
394 | /* The rx buffer allocation strategy is MTU dependent */ | |
395 | efx_rx_strategy(channel); | |
396 | ||
397 | efx_for_each_channel_rx_queue(rx_queue, channel) { | |
398 | rc = efx_init_rx_queue(rx_queue); | |
399 | if (rc) | |
400 | goto err; | |
401 | } | |
402 | ||
403 | WARN_ON(channel->rx_pkt != NULL); | |
404 | efx_rx_strategy(channel); | |
405 | } | |
406 | ||
407 | return 0; | |
408 | ||
409 | err: | |
410 | EFX_ERR(efx, "failed to initialise channel %d\n", | |
411 | channel ? channel->channel : -1); | |
412 | efx_fini_channels(efx); | |
413 | return rc; | |
414 | } | |
415 | ||
416 | /* This enables event queue processing and packet transmission. | |
417 | * | |
418 | * Note that this function is not allowed to fail, since that would | |
419 | * introduce too much complexity into the suspend/resume path. | |
420 | */ | |
421 | static void efx_start_channel(struct efx_channel *channel) | |
422 | { | |
423 | struct efx_rx_queue *rx_queue; | |
424 | ||
425 | EFX_LOG(channel->efx, "starting chan %d\n", channel->channel); | |
426 | ||
427 | if (!(channel->efx->net_dev->flags & IFF_UP)) | |
428 | netif_napi_add(channel->napi_dev, &channel->napi_str, | |
429 | efx_poll, napi_weight); | |
430 | ||
5b9e207c BH |
431 | /* The interrupt handler for this channel may set work_pending |
432 | * as soon as we enable it. Make sure it's cleared before | |
433 | * then. Similarly, make sure it sees the enabled flag set. */ | |
8ceee660 BH |
434 | channel->work_pending = 0; |
435 | channel->enabled = 1; | |
5b9e207c | 436 | smp_wmb(); |
8ceee660 BH |
437 | |
438 | napi_enable(&channel->napi_str); | |
439 | ||
440 | /* Load up RX descriptors */ | |
441 | efx_for_each_channel_rx_queue(rx_queue, channel) | |
442 | efx_fast_push_rx_descriptors(rx_queue); | |
443 | } | |
444 | ||
445 | /* This disables event queue processing and packet transmission. | |
446 | * This function does not guarantee that all queue processing | |
447 | * (e.g. RX refill) is complete. | |
448 | */ | |
449 | static void efx_stop_channel(struct efx_channel *channel) | |
450 | { | |
451 | struct efx_rx_queue *rx_queue; | |
452 | ||
453 | if (!channel->enabled) | |
454 | return; | |
455 | ||
456 | EFX_LOG(channel->efx, "stop chan %d\n", channel->channel); | |
457 | ||
458 | channel->enabled = 0; | |
459 | napi_disable(&channel->napi_str); | |
460 | ||
461 | /* Ensure that any worker threads have exited or will be no-ops */ | |
462 | efx_for_each_channel_rx_queue(rx_queue, channel) { | |
463 | spin_lock_bh(&rx_queue->add_lock); | |
464 | spin_unlock_bh(&rx_queue->add_lock); | |
465 | } | |
466 | } | |
467 | ||
468 | static void efx_fini_channels(struct efx_nic *efx) | |
469 | { | |
470 | struct efx_channel *channel; | |
471 | struct efx_tx_queue *tx_queue; | |
472 | struct efx_rx_queue *rx_queue; | |
473 | ||
474 | EFX_ASSERT_RESET_SERIALISED(efx); | |
475 | BUG_ON(efx->port_enabled); | |
476 | ||
477 | efx_for_each_channel(channel, efx) { | |
478 | EFX_LOG(channel->efx, "shut down chan %d\n", channel->channel); | |
479 | ||
480 | efx_for_each_channel_rx_queue(rx_queue, channel) | |
481 | efx_fini_rx_queue(rx_queue); | |
482 | efx_for_each_channel_tx_queue(tx_queue, channel) | |
483 | efx_fini_tx_queue(tx_queue); | |
484 | } | |
485 | ||
486 | /* Do the event queues last so that we can handle flush events | |
487 | * for all DMA queues. */ | |
488 | efx_for_each_channel(channel, efx) { | |
489 | EFX_LOG(channel->efx, "shut down evq %d\n", channel->channel); | |
490 | ||
491 | efx_fini_eventq(channel); | |
492 | } | |
493 | } | |
494 | ||
495 | static void efx_remove_channel(struct efx_channel *channel) | |
496 | { | |
497 | struct efx_tx_queue *tx_queue; | |
498 | struct efx_rx_queue *rx_queue; | |
499 | ||
500 | EFX_LOG(channel->efx, "destroy chan %d\n", channel->channel); | |
501 | ||
502 | efx_for_each_channel_rx_queue(rx_queue, channel) | |
503 | efx_remove_rx_queue(rx_queue); | |
504 | efx_for_each_channel_tx_queue(tx_queue, channel) | |
505 | efx_remove_tx_queue(tx_queue); | |
506 | efx_remove_eventq(channel); | |
507 | ||
508 | channel->used_flags = 0; | |
509 | } | |
510 | ||
511 | void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue, int delay) | |
512 | { | |
513 | queue_delayed_work(refill_workqueue, &rx_queue->work, delay); | |
514 | } | |
515 | ||
516 | /************************************************************************** | |
517 | * | |
518 | * Port handling | |
519 | * | |
520 | **************************************************************************/ | |
521 | ||
522 | /* This ensures that the kernel is kept informed (via | |
523 | * netif_carrier_on/off) of the link status, and also maintains the | |
524 | * link status's stop on the port's TX queue. | |
525 | */ | |
526 | static void efx_link_status_changed(struct efx_nic *efx) | |
527 | { | |
528 | int carrier_ok; | |
529 | ||
530 | /* SFC Bug 5356: A net_dev notifier is registered, so we must ensure | |
531 | * that no events are triggered between unregister_netdev() and the | |
532 | * driver unloading. A more general condition is that NETDEV_CHANGE | |
533 | * can only be generated between NETDEV_UP and NETDEV_DOWN */ | |
534 | if (!netif_running(efx->net_dev)) | |
535 | return; | |
536 | ||
537 | carrier_ok = netif_carrier_ok(efx->net_dev) ? 1 : 0; | |
538 | if (efx->link_up != carrier_ok) { | |
539 | efx->n_link_state_changes++; | |
540 | ||
541 | if (efx->link_up) | |
542 | netif_carrier_on(efx->net_dev); | |
543 | else | |
544 | netif_carrier_off(efx->net_dev); | |
545 | } | |
546 | ||
547 | /* Status message for kernel log */ | |
548 | if (efx->link_up) { | |
549 | struct mii_if_info *gmii = &efx->mii; | |
550 | unsigned adv, lpa; | |
551 | /* NONE here means direct XAUI from the controller, with no | |
552 | * MDIO-attached device we can query. */ | |
553 | if (efx->phy_type != PHY_TYPE_NONE) { | |
554 | adv = gmii_advertised(gmii); | |
555 | lpa = gmii_lpa(gmii); | |
556 | } else { | |
557 | lpa = GM_LPA_10000 | LPA_DUPLEX; | |
558 | adv = lpa; | |
559 | } | |
560 | EFX_INFO(efx, "link up at %dMbps %s-duplex " | |
561 | "(adv %04x lpa %04x) (MTU %d)%s\n", | |
562 | (efx->link_options & GM_LPA_10000 ? 10000 : | |
563 | (efx->link_options & GM_LPA_1000 ? 1000 : | |
564 | (efx->link_options & GM_LPA_100 ? 100 : | |
565 | 10))), | |
566 | (efx->link_options & GM_LPA_DUPLEX ? | |
567 | "full" : "half"), | |
568 | adv, lpa, | |
569 | efx->net_dev->mtu, | |
570 | (efx->promiscuous ? " [PROMISC]" : "")); | |
571 | } else { | |
572 | EFX_INFO(efx, "link down\n"); | |
573 | } | |
574 | ||
575 | } | |
576 | ||
577 | /* This call reinitialises the MAC to pick up new PHY settings. The | |
578 | * caller must hold the mac_lock */ | |
579 | static void __efx_reconfigure_port(struct efx_nic *efx) | |
580 | { | |
581 | WARN_ON(!mutex_is_locked(&efx->mac_lock)); | |
582 | ||
583 | EFX_LOG(efx, "reconfiguring MAC from PHY settings on CPU %d\n", | |
584 | raw_smp_processor_id()); | |
585 | ||
586 | falcon_reconfigure_xmac(efx); | |
587 | ||
588 | /* Inform kernel of loss/gain of carrier */ | |
589 | efx_link_status_changed(efx); | |
590 | } | |
591 | ||
592 | /* Reinitialise the MAC to pick up new PHY settings, even if the port is | |
593 | * disabled. */ | |
594 | void efx_reconfigure_port(struct efx_nic *efx) | |
595 | { | |
596 | EFX_ASSERT_RESET_SERIALISED(efx); | |
597 | ||
598 | mutex_lock(&efx->mac_lock); | |
599 | __efx_reconfigure_port(efx); | |
600 | mutex_unlock(&efx->mac_lock); | |
601 | } | |
602 | ||
603 | /* Asynchronous efx_reconfigure_port work item. To speed up efx_flush_all() | |
604 | * we don't efx_reconfigure_port() if the port is disabled. Care is taken | |
605 | * in efx_stop_all() and efx_start_port() to prevent PHY events being lost */ | |
606 | static void efx_reconfigure_work(struct work_struct *data) | |
607 | { | |
608 | struct efx_nic *efx = container_of(data, struct efx_nic, | |
609 | reconfigure_work); | |
610 | ||
611 | mutex_lock(&efx->mac_lock); | |
612 | if (efx->port_enabled) | |
613 | __efx_reconfigure_port(efx); | |
614 | mutex_unlock(&efx->mac_lock); | |
615 | } | |
616 | ||
617 | static int efx_probe_port(struct efx_nic *efx) | |
618 | { | |
619 | int rc; | |
620 | ||
621 | EFX_LOG(efx, "create port\n"); | |
622 | ||
623 | /* Connect up MAC/PHY operations table and read MAC address */ | |
624 | rc = falcon_probe_port(efx); | |
625 | if (rc) | |
626 | goto err; | |
627 | ||
628 | /* Sanity check MAC address */ | |
629 | if (is_valid_ether_addr(efx->mac_address)) { | |
630 | memcpy(efx->net_dev->dev_addr, efx->mac_address, ETH_ALEN); | |
631 | } else { | |
632 | DECLARE_MAC_BUF(mac); | |
633 | ||
634 | EFX_ERR(efx, "invalid MAC address %s\n", | |
635 | print_mac(mac, efx->mac_address)); | |
636 | if (!allow_bad_hwaddr) { | |
637 | rc = -EINVAL; | |
638 | goto err; | |
639 | } | |
640 | random_ether_addr(efx->net_dev->dev_addr); | |
641 | EFX_INFO(efx, "using locally-generated MAC %s\n", | |
642 | print_mac(mac, efx->net_dev->dev_addr)); | |
643 | } | |
644 | ||
645 | return 0; | |
646 | ||
647 | err: | |
648 | efx_remove_port(efx); | |
649 | return rc; | |
650 | } | |
651 | ||
652 | static int efx_init_port(struct efx_nic *efx) | |
653 | { | |
654 | int rc; | |
655 | ||
656 | EFX_LOG(efx, "init port\n"); | |
657 | ||
658 | /* Initialise the MAC and PHY */ | |
659 | rc = falcon_init_xmac(efx); | |
660 | if (rc) | |
661 | return rc; | |
662 | ||
663 | efx->port_initialized = 1; | |
664 | ||
665 | /* Reconfigure port to program MAC registers */ | |
666 | falcon_reconfigure_xmac(efx); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | /* Allow efx_reconfigure_port() to be scheduled, and close the window | |
672 | * between efx_stop_port and efx_flush_all whereby a previously scheduled | |
673 | * efx_reconfigure_port() may have been cancelled */ | |
674 | static void efx_start_port(struct efx_nic *efx) | |
675 | { | |
676 | EFX_LOG(efx, "start port\n"); | |
677 | BUG_ON(efx->port_enabled); | |
678 | ||
679 | mutex_lock(&efx->mac_lock); | |
680 | efx->port_enabled = 1; | |
681 | __efx_reconfigure_port(efx); | |
682 | mutex_unlock(&efx->mac_lock); | |
683 | } | |
684 | ||
685 | /* Prevent efx_reconfigure_work and efx_monitor() from executing, and | |
686 | * efx_set_multicast_list() from scheduling efx_reconfigure_work. | |
687 | * efx_reconfigure_work can still be scheduled via NAPI processing | |
688 | * until efx_flush_all() is called */ | |
689 | static void efx_stop_port(struct efx_nic *efx) | |
690 | { | |
691 | EFX_LOG(efx, "stop port\n"); | |
692 | ||
693 | mutex_lock(&efx->mac_lock); | |
694 | efx->port_enabled = 0; | |
695 | mutex_unlock(&efx->mac_lock); | |
696 | ||
697 | /* Serialise against efx_set_multicast_list() */ | |
55668611 | 698 | if (efx_dev_registered(efx)) { |
b9e40857 DM |
699 | netif_addr_lock_bh(efx->net_dev); |
700 | netif_addr_unlock_bh(efx->net_dev); | |
8ceee660 BH |
701 | } |
702 | } | |
703 | ||
704 | static void efx_fini_port(struct efx_nic *efx) | |
705 | { | |
706 | EFX_LOG(efx, "shut down port\n"); | |
707 | ||
708 | if (!efx->port_initialized) | |
709 | return; | |
710 | ||
711 | falcon_fini_xmac(efx); | |
712 | efx->port_initialized = 0; | |
713 | ||
714 | efx->link_up = 0; | |
715 | efx_link_status_changed(efx); | |
716 | } | |
717 | ||
718 | static void efx_remove_port(struct efx_nic *efx) | |
719 | { | |
720 | EFX_LOG(efx, "destroying port\n"); | |
721 | ||
722 | falcon_remove_port(efx); | |
723 | } | |
724 | ||
725 | /************************************************************************** | |
726 | * | |
727 | * NIC handling | |
728 | * | |
729 | **************************************************************************/ | |
730 | ||
731 | /* This configures the PCI device to enable I/O and DMA. */ | |
732 | static int efx_init_io(struct efx_nic *efx) | |
733 | { | |
734 | struct pci_dev *pci_dev = efx->pci_dev; | |
735 | dma_addr_t dma_mask = efx->type->max_dma_mask; | |
736 | int rc; | |
737 | ||
738 | EFX_LOG(efx, "initialising I/O\n"); | |
739 | ||
740 | rc = pci_enable_device(pci_dev); | |
741 | if (rc) { | |
742 | EFX_ERR(efx, "failed to enable PCI device\n"); | |
743 | goto fail1; | |
744 | } | |
745 | ||
746 | pci_set_master(pci_dev); | |
747 | ||
748 | /* Set the PCI DMA mask. Try all possibilities from our | |
749 | * genuine mask down to 32 bits, because some architectures | |
750 | * (e.g. x86_64 with iommu_sac_force set) will allow 40 bit | |
751 | * masks event though they reject 46 bit masks. | |
752 | */ | |
753 | while (dma_mask > 0x7fffffffUL) { | |
754 | if (pci_dma_supported(pci_dev, dma_mask) && | |
755 | ((rc = pci_set_dma_mask(pci_dev, dma_mask)) == 0)) | |
756 | break; | |
757 | dma_mask >>= 1; | |
758 | } | |
759 | if (rc) { | |
760 | EFX_ERR(efx, "could not find a suitable DMA mask\n"); | |
761 | goto fail2; | |
762 | } | |
763 | EFX_LOG(efx, "using DMA mask %llx\n", (unsigned long long) dma_mask); | |
764 | rc = pci_set_consistent_dma_mask(pci_dev, dma_mask); | |
765 | if (rc) { | |
766 | /* pci_set_consistent_dma_mask() is not *allowed* to | |
767 | * fail with a mask that pci_set_dma_mask() accepted, | |
768 | * but just in case... | |
769 | */ | |
770 | EFX_ERR(efx, "failed to set consistent DMA mask\n"); | |
771 | goto fail2; | |
772 | } | |
773 | ||
774 | efx->membase_phys = pci_resource_start(efx->pci_dev, | |
775 | efx->type->mem_bar); | |
776 | rc = pci_request_region(pci_dev, efx->type->mem_bar, "sfc"); | |
777 | if (rc) { | |
778 | EFX_ERR(efx, "request for memory BAR failed\n"); | |
779 | rc = -EIO; | |
780 | goto fail3; | |
781 | } | |
782 | efx->membase = ioremap_nocache(efx->membase_phys, | |
783 | efx->type->mem_map_size); | |
784 | if (!efx->membase) { | |
086ea356 BH |
785 | EFX_ERR(efx, "could not map memory BAR %d at %llx+%x\n", |
786 | efx->type->mem_bar, | |
787 | (unsigned long long)efx->membase_phys, | |
8ceee660 BH |
788 | efx->type->mem_map_size); |
789 | rc = -ENOMEM; | |
790 | goto fail4; | |
791 | } | |
086ea356 BH |
792 | EFX_LOG(efx, "memory BAR %u at %llx+%x (virtual %p)\n", |
793 | efx->type->mem_bar, (unsigned long long)efx->membase_phys, | |
794 | efx->type->mem_map_size, efx->membase); | |
8ceee660 BH |
795 | |
796 | return 0; | |
797 | ||
798 | fail4: | |
799 | release_mem_region(efx->membase_phys, efx->type->mem_map_size); | |
800 | fail3: | |
2c118e0f | 801 | efx->membase_phys = 0; |
8ceee660 BH |
802 | fail2: |
803 | pci_disable_device(efx->pci_dev); | |
804 | fail1: | |
805 | return rc; | |
806 | } | |
807 | ||
808 | static void efx_fini_io(struct efx_nic *efx) | |
809 | { | |
810 | EFX_LOG(efx, "shutting down I/O\n"); | |
811 | ||
812 | if (efx->membase) { | |
813 | iounmap(efx->membase); | |
814 | efx->membase = NULL; | |
815 | } | |
816 | ||
817 | if (efx->membase_phys) { | |
818 | pci_release_region(efx->pci_dev, efx->type->mem_bar); | |
2c118e0f | 819 | efx->membase_phys = 0; |
8ceee660 BH |
820 | } |
821 | ||
822 | pci_disable_device(efx->pci_dev); | |
823 | } | |
824 | ||
825 | /* Probe the number and type of interrupts we are able to obtain. */ | |
826 | static void efx_probe_interrupts(struct efx_nic *efx) | |
827 | { | |
828 | int max_channel = efx->type->phys_addr_channels - 1; | |
829 | struct msix_entry xentries[EFX_MAX_CHANNELS]; | |
830 | int rc, i; | |
831 | ||
832 | if (efx->interrupt_mode == EFX_INT_MODE_MSIX) { | |
833 | BUG_ON(!pci_find_capability(efx->pci_dev, PCI_CAP_ID_MSIX)); | |
834 | ||
835 | efx->rss_queues = rss_cpus ? rss_cpus : num_online_cpus(); | |
836 | efx->rss_queues = min(efx->rss_queues, max_channel + 1); | |
837 | efx->rss_queues = min(efx->rss_queues, EFX_MAX_CHANNELS); | |
838 | ||
839 | /* Request maximum number of MSI interrupts, and fill out | |
840 | * the channel interrupt information the allowed allocation */ | |
841 | for (i = 0; i < efx->rss_queues; i++) | |
842 | xentries[i].entry = i; | |
843 | rc = pci_enable_msix(efx->pci_dev, xentries, efx->rss_queues); | |
844 | if (rc > 0) { | |
845 | EFX_BUG_ON_PARANOID(rc >= efx->rss_queues); | |
846 | efx->rss_queues = rc; | |
847 | rc = pci_enable_msix(efx->pci_dev, xentries, | |
848 | efx->rss_queues); | |
849 | } | |
850 | ||
851 | if (rc == 0) { | |
852 | for (i = 0; i < efx->rss_queues; i++) { | |
853 | efx->channel[i].has_interrupt = 1; | |
854 | efx->channel[i].irq = xentries[i].vector; | |
855 | } | |
856 | } else { | |
857 | /* Fall back to single channel MSI */ | |
858 | efx->interrupt_mode = EFX_INT_MODE_MSI; | |
859 | EFX_ERR(efx, "could not enable MSI-X\n"); | |
860 | } | |
861 | } | |
862 | ||
863 | /* Try single interrupt MSI */ | |
864 | if (efx->interrupt_mode == EFX_INT_MODE_MSI) { | |
865 | efx->rss_queues = 1; | |
866 | rc = pci_enable_msi(efx->pci_dev); | |
867 | if (rc == 0) { | |
868 | efx->channel[0].irq = efx->pci_dev->irq; | |
869 | efx->channel[0].has_interrupt = 1; | |
870 | } else { | |
871 | EFX_ERR(efx, "could not enable MSI\n"); | |
872 | efx->interrupt_mode = EFX_INT_MODE_LEGACY; | |
873 | } | |
874 | } | |
875 | ||
876 | /* Assume legacy interrupts */ | |
877 | if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) { | |
878 | efx->rss_queues = 1; | |
879 | /* Every channel is interruptible */ | |
880 | for (i = 0; i < EFX_MAX_CHANNELS; i++) | |
881 | efx->channel[i].has_interrupt = 1; | |
882 | efx->legacy_irq = efx->pci_dev->irq; | |
883 | } | |
884 | } | |
885 | ||
886 | static void efx_remove_interrupts(struct efx_nic *efx) | |
887 | { | |
888 | struct efx_channel *channel; | |
889 | ||
890 | /* Remove MSI/MSI-X interrupts */ | |
891 | efx_for_each_channel_with_interrupt(channel, efx) | |
892 | channel->irq = 0; | |
893 | pci_disable_msi(efx->pci_dev); | |
894 | pci_disable_msix(efx->pci_dev); | |
895 | ||
896 | /* Remove legacy interrupt */ | |
897 | efx->legacy_irq = 0; | |
898 | } | |
899 | ||
900 | /* Select number of used resources | |
901 | * Should be called after probe_interrupts() | |
902 | */ | |
903 | static void efx_select_used(struct efx_nic *efx) | |
904 | { | |
905 | struct efx_tx_queue *tx_queue; | |
906 | struct efx_rx_queue *rx_queue; | |
907 | int i; | |
908 | ||
909 | /* TX queues. One per port per channel with TX capability | |
910 | * (more than one per port won't work on Linux, due to out | |
911 | * of order issues... but will be fine on Solaris) | |
912 | */ | |
913 | tx_queue = &efx->tx_queue[0]; | |
914 | ||
915 | /* Perform this for each channel with TX capabilities. | |
916 | * At the moment, we only support a single TX queue | |
917 | */ | |
918 | tx_queue->used = 1; | |
919 | if ((!EFX_INT_MODE_USE_MSI(efx)) && separate_tx_and_rx_channels) | |
920 | tx_queue->channel = &efx->channel[1]; | |
921 | else | |
922 | tx_queue->channel = &efx->channel[0]; | |
923 | tx_queue->channel->used_flags |= EFX_USED_BY_TX; | |
924 | tx_queue++; | |
925 | ||
926 | /* RX queues. Each has a dedicated channel. */ | |
927 | for (i = 0; i < EFX_MAX_RX_QUEUES; i++) { | |
928 | rx_queue = &efx->rx_queue[i]; | |
929 | ||
930 | if (i < efx->rss_queues) { | |
931 | rx_queue->used = 1; | |
932 | /* If we allow multiple RX queues per channel | |
933 | * we need to decide that here | |
934 | */ | |
935 | rx_queue->channel = &efx->channel[rx_queue->queue]; | |
936 | rx_queue->channel->used_flags |= EFX_USED_BY_RX; | |
937 | rx_queue++; | |
938 | } | |
939 | } | |
940 | } | |
941 | ||
942 | static int efx_probe_nic(struct efx_nic *efx) | |
943 | { | |
944 | int rc; | |
945 | ||
946 | EFX_LOG(efx, "creating NIC\n"); | |
947 | ||
948 | /* Carry out hardware-type specific initialisation */ | |
949 | rc = falcon_probe_nic(efx); | |
950 | if (rc) | |
951 | return rc; | |
952 | ||
953 | /* Determine the number of channels and RX queues by trying to hook | |
954 | * in MSI-X interrupts. */ | |
955 | efx_probe_interrupts(efx); | |
956 | ||
957 | /* Determine number of RX queues and TX queues */ | |
958 | efx_select_used(efx); | |
959 | ||
960 | /* Initialise the interrupt moderation settings */ | |
961 | efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec); | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | static void efx_remove_nic(struct efx_nic *efx) | |
967 | { | |
968 | EFX_LOG(efx, "destroying NIC\n"); | |
969 | ||
970 | efx_remove_interrupts(efx); | |
971 | falcon_remove_nic(efx); | |
972 | } | |
973 | ||
974 | /************************************************************************** | |
975 | * | |
976 | * NIC startup/shutdown | |
977 | * | |
978 | *************************************************************************/ | |
979 | ||
980 | static int efx_probe_all(struct efx_nic *efx) | |
981 | { | |
982 | struct efx_channel *channel; | |
983 | int rc; | |
984 | ||
985 | /* Create NIC */ | |
986 | rc = efx_probe_nic(efx); | |
987 | if (rc) { | |
988 | EFX_ERR(efx, "failed to create NIC\n"); | |
989 | goto fail1; | |
990 | } | |
991 | ||
992 | /* Create port */ | |
993 | rc = efx_probe_port(efx); | |
994 | if (rc) { | |
995 | EFX_ERR(efx, "failed to create port\n"); | |
996 | goto fail2; | |
997 | } | |
998 | ||
999 | /* Create channels */ | |
1000 | efx_for_each_channel(channel, efx) { | |
1001 | rc = efx_probe_channel(channel); | |
1002 | if (rc) { | |
1003 | EFX_ERR(efx, "failed to create channel %d\n", | |
1004 | channel->channel); | |
1005 | goto fail3; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | return 0; | |
1010 | ||
1011 | fail3: | |
1012 | efx_for_each_channel(channel, efx) | |
1013 | efx_remove_channel(channel); | |
1014 | efx_remove_port(efx); | |
1015 | fail2: | |
1016 | efx_remove_nic(efx); | |
1017 | fail1: | |
1018 | return rc; | |
1019 | } | |
1020 | ||
1021 | /* Called after previous invocation(s) of efx_stop_all, restarts the | |
1022 | * port, kernel transmit queue, NAPI processing and hardware interrupts, | |
1023 | * and ensures that the port is scheduled to be reconfigured. | |
1024 | * This function is safe to call multiple times when the NIC is in any | |
1025 | * state. */ | |
1026 | static void efx_start_all(struct efx_nic *efx) | |
1027 | { | |
1028 | struct efx_channel *channel; | |
1029 | ||
1030 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1031 | ||
1032 | /* Check that it is appropriate to restart the interface. All | |
1033 | * of these flags are safe to read under just the rtnl lock */ | |
1034 | if (efx->port_enabled) | |
1035 | return; | |
1036 | if ((efx->state != STATE_RUNNING) && (efx->state != STATE_INIT)) | |
1037 | return; | |
55668611 | 1038 | if (efx_dev_registered(efx) && !netif_running(efx->net_dev)) |
8ceee660 BH |
1039 | return; |
1040 | ||
1041 | /* Mark the port as enabled so port reconfigurations can start, then | |
1042 | * restart the transmit interface early so the watchdog timer stops */ | |
1043 | efx_start_port(efx); | |
1044 | efx_wake_queue(efx); | |
1045 | ||
1046 | efx_for_each_channel(channel, efx) | |
1047 | efx_start_channel(channel); | |
1048 | ||
1049 | falcon_enable_interrupts(efx); | |
1050 | ||
1051 | /* Start hardware monitor if we're in RUNNING */ | |
1052 | if (efx->state == STATE_RUNNING) | |
1053 | queue_delayed_work(efx->workqueue, &efx->monitor_work, | |
1054 | efx_monitor_interval); | |
1055 | } | |
1056 | ||
1057 | /* Flush all delayed work. Should only be called when no more delayed work | |
1058 | * will be scheduled. This doesn't flush pending online resets (efx_reset), | |
1059 | * since we're holding the rtnl_lock at this point. */ | |
1060 | static void efx_flush_all(struct efx_nic *efx) | |
1061 | { | |
1062 | struct efx_rx_queue *rx_queue; | |
1063 | ||
1064 | /* Make sure the hardware monitor is stopped */ | |
1065 | cancel_delayed_work_sync(&efx->monitor_work); | |
1066 | ||
1067 | /* Ensure that all RX slow refills are complete. */ | |
b3475645 | 1068 | efx_for_each_rx_queue(rx_queue, efx) |
8ceee660 | 1069 | cancel_delayed_work_sync(&rx_queue->work); |
8ceee660 BH |
1070 | |
1071 | /* Stop scheduled port reconfigurations */ | |
1072 | cancel_work_sync(&efx->reconfigure_work); | |
1073 | ||
1074 | } | |
1075 | ||
1076 | /* Quiesce hardware and software without bringing the link down. | |
1077 | * Safe to call multiple times, when the nic and interface is in any | |
1078 | * state. The caller is guaranteed to subsequently be in a position | |
1079 | * to modify any hardware and software state they see fit without | |
1080 | * taking locks. */ | |
1081 | static void efx_stop_all(struct efx_nic *efx) | |
1082 | { | |
1083 | struct efx_channel *channel; | |
1084 | ||
1085 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1086 | ||
1087 | /* port_enabled can be read safely under the rtnl lock */ | |
1088 | if (!efx->port_enabled) | |
1089 | return; | |
1090 | ||
1091 | /* Disable interrupts and wait for ISR to complete */ | |
1092 | falcon_disable_interrupts(efx); | |
1093 | if (efx->legacy_irq) | |
1094 | synchronize_irq(efx->legacy_irq); | |
b3475645 | 1095 | efx_for_each_channel_with_interrupt(channel, efx) { |
8ceee660 BH |
1096 | if (channel->irq) |
1097 | synchronize_irq(channel->irq); | |
b3475645 | 1098 | } |
8ceee660 BH |
1099 | |
1100 | /* Stop all NAPI processing and synchronous rx refills */ | |
1101 | efx_for_each_channel(channel, efx) | |
1102 | efx_stop_channel(channel); | |
1103 | ||
1104 | /* Stop all asynchronous port reconfigurations. Since all | |
1105 | * event processing has already been stopped, there is no | |
1106 | * window to loose phy events */ | |
1107 | efx_stop_port(efx); | |
1108 | ||
1109 | /* Flush reconfigure_work, refill_workqueue, monitor_work */ | |
1110 | efx_flush_all(efx); | |
1111 | ||
1112 | /* Isolate the MAC from the TX and RX engines, so that queue | |
1113 | * flushes will complete in a timely fashion. */ | |
1114 | falcon_deconfigure_mac_wrapper(efx); | |
1115 | falcon_drain_tx_fifo(efx); | |
1116 | ||
1117 | /* Stop the kernel transmit interface late, so the watchdog | |
1118 | * timer isn't ticking over the flush */ | |
1119 | efx_stop_queue(efx); | |
55668611 | 1120 | if (efx_dev_registered(efx)) { |
8ceee660 BH |
1121 | netif_tx_lock_bh(efx->net_dev); |
1122 | netif_tx_unlock_bh(efx->net_dev); | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | static void efx_remove_all(struct efx_nic *efx) | |
1127 | { | |
1128 | struct efx_channel *channel; | |
1129 | ||
1130 | efx_for_each_channel(channel, efx) | |
1131 | efx_remove_channel(channel); | |
1132 | efx_remove_port(efx); | |
1133 | efx_remove_nic(efx); | |
1134 | } | |
1135 | ||
1136 | /* A convinience function to safely flush all the queues */ | |
1137 | int efx_flush_queues(struct efx_nic *efx) | |
1138 | { | |
1139 | int rc; | |
1140 | ||
1141 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1142 | ||
1143 | efx_stop_all(efx); | |
1144 | ||
1145 | efx_fini_channels(efx); | |
1146 | rc = efx_init_channels(efx); | |
1147 | if (rc) { | |
1148 | efx_schedule_reset(efx, RESET_TYPE_DISABLE); | |
1149 | return rc; | |
1150 | } | |
1151 | ||
1152 | efx_start_all(efx); | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | /************************************************************************** | |
1158 | * | |
1159 | * Interrupt moderation | |
1160 | * | |
1161 | **************************************************************************/ | |
1162 | ||
1163 | /* Set interrupt moderation parameters */ | |
1164 | void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs, int rx_usecs) | |
1165 | { | |
1166 | struct efx_tx_queue *tx_queue; | |
1167 | struct efx_rx_queue *rx_queue; | |
1168 | ||
1169 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1170 | ||
1171 | efx_for_each_tx_queue(tx_queue, efx) | |
1172 | tx_queue->channel->irq_moderation = tx_usecs; | |
1173 | ||
1174 | efx_for_each_rx_queue(rx_queue, efx) | |
1175 | rx_queue->channel->irq_moderation = rx_usecs; | |
1176 | } | |
1177 | ||
1178 | /************************************************************************** | |
1179 | * | |
1180 | * Hardware monitor | |
1181 | * | |
1182 | **************************************************************************/ | |
1183 | ||
1184 | /* Run periodically off the general workqueue. Serialised against | |
1185 | * efx_reconfigure_port via the mac_lock */ | |
1186 | static void efx_monitor(struct work_struct *data) | |
1187 | { | |
1188 | struct efx_nic *efx = container_of(data, struct efx_nic, | |
1189 | monitor_work.work); | |
1190 | int rc = 0; | |
1191 | ||
1192 | EFX_TRACE(efx, "hardware monitor executing on CPU %d\n", | |
1193 | raw_smp_processor_id()); | |
1194 | ||
1195 | ||
1196 | /* If the mac_lock is already held then it is likely a port | |
1197 | * reconfiguration is already in place, which will likely do | |
1198 | * most of the work of check_hw() anyway. */ | |
1199 | if (!mutex_trylock(&efx->mac_lock)) { | |
1200 | queue_delayed_work(efx->workqueue, &efx->monitor_work, | |
1201 | efx_monitor_interval); | |
1202 | return; | |
1203 | } | |
1204 | ||
1205 | if (efx->port_enabled) | |
1206 | rc = falcon_check_xmac(efx); | |
1207 | mutex_unlock(&efx->mac_lock); | |
1208 | ||
1209 | if (rc) { | |
1210 | if (monitor_reset) { | |
1211 | EFX_ERR(efx, "hardware monitor detected a fault: " | |
1212 | "triggering reset\n"); | |
1213 | efx_schedule_reset(efx, RESET_TYPE_MONITOR); | |
1214 | } else { | |
1215 | EFX_ERR(efx, "hardware monitor detected a fault, " | |
1216 | "skipping reset\n"); | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | queue_delayed_work(efx->workqueue, &efx->monitor_work, | |
1221 | efx_monitor_interval); | |
1222 | } | |
1223 | ||
1224 | /************************************************************************** | |
1225 | * | |
1226 | * ioctls | |
1227 | * | |
1228 | *************************************************************************/ | |
1229 | ||
1230 | /* Net device ioctl | |
1231 | * Context: process, rtnl_lock() held. | |
1232 | */ | |
1233 | static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd) | |
1234 | { | |
1235 | struct efx_nic *efx = net_dev->priv; | |
1236 | ||
1237 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1238 | ||
1239 | return generic_mii_ioctl(&efx->mii, if_mii(ifr), cmd, NULL); | |
1240 | } | |
1241 | ||
1242 | /************************************************************************** | |
1243 | * | |
1244 | * NAPI interface | |
1245 | * | |
1246 | **************************************************************************/ | |
1247 | ||
1248 | static int efx_init_napi(struct efx_nic *efx) | |
1249 | { | |
1250 | struct efx_channel *channel; | |
1251 | int rc; | |
1252 | ||
1253 | efx_for_each_channel(channel, efx) { | |
1254 | channel->napi_dev = efx->net_dev; | |
1255 | rc = efx_lro_init(&channel->lro_mgr, efx); | |
1256 | if (rc) | |
1257 | goto err; | |
1258 | } | |
1259 | return 0; | |
1260 | err: | |
1261 | efx_fini_napi(efx); | |
1262 | return rc; | |
1263 | } | |
1264 | ||
1265 | static void efx_fini_napi(struct efx_nic *efx) | |
1266 | { | |
1267 | struct efx_channel *channel; | |
1268 | ||
1269 | efx_for_each_channel(channel, efx) { | |
1270 | efx_lro_fini(&channel->lro_mgr); | |
1271 | channel->napi_dev = NULL; | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | /************************************************************************** | |
1276 | * | |
1277 | * Kernel netpoll interface | |
1278 | * | |
1279 | *************************************************************************/ | |
1280 | ||
1281 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1282 | ||
1283 | /* Although in the common case interrupts will be disabled, this is not | |
1284 | * guaranteed. However, all our work happens inside the NAPI callback, | |
1285 | * so no locking is required. | |
1286 | */ | |
1287 | static void efx_netpoll(struct net_device *net_dev) | |
1288 | { | |
1289 | struct efx_nic *efx = net_dev->priv; | |
1290 | struct efx_channel *channel; | |
1291 | ||
1292 | efx_for_each_channel_with_interrupt(channel, efx) | |
1293 | efx_schedule_channel(channel); | |
1294 | } | |
1295 | ||
1296 | #endif | |
1297 | ||
1298 | /************************************************************************** | |
1299 | * | |
1300 | * Kernel net device interface | |
1301 | * | |
1302 | *************************************************************************/ | |
1303 | ||
1304 | /* Context: process, rtnl_lock() held. */ | |
1305 | static int efx_net_open(struct net_device *net_dev) | |
1306 | { | |
1307 | struct efx_nic *efx = net_dev->priv; | |
1308 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1309 | ||
1310 | EFX_LOG(efx, "opening device %s on CPU %d\n", net_dev->name, | |
1311 | raw_smp_processor_id()); | |
1312 | ||
1313 | efx_start_all(efx); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /* Context: process, rtnl_lock() held. | |
1318 | * Note that the kernel will ignore our return code; this method | |
1319 | * should really be a void. | |
1320 | */ | |
1321 | static int efx_net_stop(struct net_device *net_dev) | |
1322 | { | |
1323 | struct efx_nic *efx = net_dev->priv; | |
1324 | int rc; | |
1325 | ||
1326 | EFX_LOG(efx, "closing %s on CPU %d\n", net_dev->name, | |
1327 | raw_smp_processor_id()); | |
1328 | ||
1329 | /* Stop the device and flush all the channels */ | |
1330 | efx_stop_all(efx); | |
1331 | efx_fini_channels(efx); | |
1332 | rc = efx_init_channels(efx); | |
1333 | if (rc) | |
1334 | efx_schedule_reset(efx, RESET_TYPE_DISABLE); | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | ||
5b9e207c | 1339 | /* Context: process, dev_base_lock or RTNL held, non-blocking. */ |
8ceee660 BH |
1340 | static struct net_device_stats *efx_net_stats(struct net_device *net_dev) |
1341 | { | |
1342 | struct efx_nic *efx = net_dev->priv; | |
1343 | struct efx_mac_stats *mac_stats = &efx->mac_stats; | |
1344 | struct net_device_stats *stats = &net_dev->stats; | |
1345 | ||
5b9e207c BH |
1346 | /* Update stats if possible, but do not wait if another thread |
1347 | * is updating them (or resetting the NIC); slightly stale | |
1348 | * stats are acceptable. | |
1349 | */ | |
8ceee660 BH |
1350 | if (!spin_trylock(&efx->stats_lock)) |
1351 | return stats; | |
1352 | if (efx->state == STATE_RUNNING) { | |
1353 | falcon_update_stats_xmac(efx); | |
1354 | falcon_update_nic_stats(efx); | |
1355 | } | |
1356 | spin_unlock(&efx->stats_lock); | |
1357 | ||
1358 | stats->rx_packets = mac_stats->rx_packets; | |
1359 | stats->tx_packets = mac_stats->tx_packets; | |
1360 | stats->rx_bytes = mac_stats->rx_bytes; | |
1361 | stats->tx_bytes = mac_stats->tx_bytes; | |
1362 | stats->multicast = mac_stats->rx_multicast; | |
1363 | stats->collisions = mac_stats->tx_collision; | |
1364 | stats->rx_length_errors = (mac_stats->rx_gtjumbo + | |
1365 | mac_stats->rx_length_error); | |
1366 | stats->rx_over_errors = efx->n_rx_nodesc_drop_cnt; | |
1367 | stats->rx_crc_errors = mac_stats->rx_bad; | |
1368 | stats->rx_frame_errors = mac_stats->rx_align_error; | |
1369 | stats->rx_fifo_errors = mac_stats->rx_overflow; | |
1370 | stats->rx_missed_errors = mac_stats->rx_missed; | |
1371 | stats->tx_window_errors = mac_stats->tx_late_collision; | |
1372 | ||
1373 | stats->rx_errors = (stats->rx_length_errors + | |
1374 | stats->rx_over_errors + | |
1375 | stats->rx_crc_errors + | |
1376 | stats->rx_frame_errors + | |
1377 | stats->rx_fifo_errors + | |
1378 | stats->rx_missed_errors + | |
1379 | mac_stats->rx_symbol_error); | |
1380 | stats->tx_errors = (stats->tx_window_errors + | |
1381 | mac_stats->tx_bad); | |
1382 | ||
1383 | return stats; | |
1384 | } | |
1385 | ||
1386 | /* Context: netif_tx_lock held, BHs disabled. */ | |
1387 | static void efx_watchdog(struct net_device *net_dev) | |
1388 | { | |
1389 | struct efx_nic *efx = net_dev->priv; | |
1390 | ||
1391 | EFX_ERR(efx, "TX stuck with stop_count=%d port_enabled=%d: %s\n", | |
1392 | atomic_read(&efx->netif_stop_count), efx->port_enabled, | |
1393 | monitor_reset ? "resetting channels" : "skipping reset"); | |
1394 | ||
1395 | if (monitor_reset) | |
1396 | efx_schedule_reset(efx, RESET_TYPE_MONITOR); | |
1397 | } | |
1398 | ||
1399 | ||
1400 | /* Context: process, rtnl_lock() held. */ | |
1401 | static int efx_change_mtu(struct net_device *net_dev, int new_mtu) | |
1402 | { | |
1403 | struct efx_nic *efx = net_dev->priv; | |
1404 | int rc = 0; | |
1405 | ||
1406 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1407 | ||
1408 | if (new_mtu > EFX_MAX_MTU) | |
1409 | return -EINVAL; | |
1410 | ||
1411 | efx_stop_all(efx); | |
1412 | ||
1413 | EFX_LOG(efx, "changing MTU to %d\n", new_mtu); | |
1414 | ||
1415 | efx_fini_channels(efx); | |
1416 | net_dev->mtu = new_mtu; | |
1417 | rc = efx_init_channels(efx); | |
1418 | if (rc) | |
1419 | goto fail; | |
1420 | ||
1421 | efx_start_all(efx); | |
1422 | return rc; | |
1423 | ||
1424 | fail: | |
1425 | efx_schedule_reset(efx, RESET_TYPE_DISABLE); | |
1426 | return rc; | |
1427 | } | |
1428 | ||
1429 | static int efx_set_mac_address(struct net_device *net_dev, void *data) | |
1430 | { | |
1431 | struct efx_nic *efx = net_dev->priv; | |
1432 | struct sockaddr *addr = data; | |
1433 | char *new_addr = addr->sa_data; | |
1434 | ||
1435 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1436 | ||
1437 | if (!is_valid_ether_addr(new_addr)) { | |
1438 | DECLARE_MAC_BUF(mac); | |
1439 | EFX_ERR(efx, "invalid ethernet MAC address requested: %s\n", | |
1440 | print_mac(mac, new_addr)); | |
1441 | return -EINVAL; | |
1442 | } | |
1443 | ||
1444 | memcpy(net_dev->dev_addr, new_addr, net_dev->addr_len); | |
1445 | ||
1446 | /* Reconfigure the MAC */ | |
1447 | efx_reconfigure_port(efx); | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | /* Context: netif_tx_lock held, BHs disabled. */ | |
1453 | static void efx_set_multicast_list(struct net_device *net_dev) | |
1454 | { | |
1455 | struct efx_nic *efx = net_dev->priv; | |
1456 | struct dev_mc_list *mc_list = net_dev->mc_list; | |
1457 | union efx_multicast_hash *mc_hash = &efx->multicast_hash; | |
1458 | int promiscuous; | |
1459 | u32 crc; | |
1460 | int bit; | |
1461 | int i; | |
1462 | ||
1463 | /* Set per-MAC promiscuity flag and reconfigure MAC if necessary */ | |
1464 | promiscuous = (net_dev->flags & IFF_PROMISC) ? 1 : 0; | |
1465 | if (efx->promiscuous != promiscuous) { | |
1466 | efx->promiscuous = promiscuous; | |
1467 | /* Close the window between efx_stop_port() and efx_flush_all() | |
1468 | * by only queuing work when the port is enabled. */ | |
1469 | if (efx->port_enabled) | |
1470 | queue_work(efx->workqueue, &efx->reconfigure_work); | |
1471 | } | |
1472 | ||
1473 | /* Build multicast hash table */ | |
1474 | if (promiscuous || (net_dev->flags & IFF_ALLMULTI)) { | |
1475 | memset(mc_hash, 0xff, sizeof(*mc_hash)); | |
1476 | } else { | |
1477 | memset(mc_hash, 0x00, sizeof(*mc_hash)); | |
1478 | for (i = 0; i < net_dev->mc_count; i++) { | |
1479 | crc = ether_crc_le(ETH_ALEN, mc_list->dmi_addr); | |
1480 | bit = crc & (EFX_MCAST_HASH_ENTRIES - 1); | |
1481 | set_bit_le(bit, mc_hash->byte); | |
1482 | mc_list = mc_list->next; | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | /* Create and activate new global multicast hash table */ | |
1487 | falcon_set_multicast_hash(efx); | |
1488 | } | |
1489 | ||
1490 | static int efx_netdev_event(struct notifier_block *this, | |
1491 | unsigned long event, void *ptr) | |
1492 | { | |
d3208b5e | 1493 | struct net_device *net_dev = ptr; |
8ceee660 BH |
1494 | |
1495 | if (net_dev->open == efx_net_open && event == NETDEV_CHANGENAME) { | |
1496 | struct efx_nic *efx = net_dev->priv; | |
1497 | ||
1498 | strcpy(efx->name, net_dev->name); | |
1499 | } | |
1500 | ||
1501 | return NOTIFY_DONE; | |
1502 | } | |
1503 | ||
1504 | static struct notifier_block efx_netdev_notifier = { | |
1505 | .notifier_call = efx_netdev_event, | |
1506 | }; | |
1507 | ||
1508 | static int efx_register_netdev(struct efx_nic *efx) | |
1509 | { | |
1510 | struct net_device *net_dev = efx->net_dev; | |
1511 | int rc; | |
1512 | ||
1513 | net_dev->watchdog_timeo = 5 * HZ; | |
1514 | net_dev->irq = efx->pci_dev->irq; | |
1515 | net_dev->open = efx_net_open; | |
1516 | net_dev->stop = efx_net_stop; | |
1517 | net_dev->get_stats = efx_net_stats; | |
1518 | net_dev->tx_timeout = &efx_watchdog; | |
1519 | net_dev->hard_start_xmit = efx_hard_start_xmit; | |
1520 | net_dev->do_ioctl = efx_ioctl; | |
1521 | net_dev->change_mtu = efx_change_mtu; | |
1522 | net_dev->set_mac_address = efx_set_mac_address; | |
1523 | net_dev->set_multicast_list = efx_set_multicast_list; | |
1524 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1525 | net_dev->poll_controller = efx_netpoll; | |
1526 | #endif | |
1527 | SET_NETDEV_DEV(net_dev, &efx->pci_dev->dev); | |
1528 | SET_ETHTOOL_OPS(net_dev, &efx_ethtool_ops); | |
1529 | ||
1530 | /* Always start with carrier off; PHY events will detect the link */ | |
1531 | netif_carrier_off(efx->net_dev); | |
1532 | ||
1533 | /* Clear MAC statistics */ | |
1534 | falcon_update_stats_xmac(efx); | |
1535 | memset(&efx->mac_stats, 0, sizeof(efx->mac_stats)); | |
1536 | ||
1537 | rc = register_netdev(net_dev); | |
1538 | if (rc) { | |
1539 | EFX_ERR(efx, "could not register net dev\n"); | |
1540 | return rc; | |
1541 | } | |
1542 | strcpy(efx->name, net_dev->name); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | static void efx_unregister_netdev(struct efx_nic *efx) | |
1548 | { | |
1549 | struct efx_tx_queue *tx_queue; | |
1550 | ||
1551 | if (!efx->net_dev) | |
1552 | return; | |
1553 | ||
1554 | BUG_ON(efx->net_dev->priv != efx); | |
1555 | ||
1556 | /* Free up any skbs still remaining. This has to happen before | |
1557 | * we try to unregister the netdev as running their destructors | |
1558 | * may be needed to get the device ref. count to 0. */ | |
1559 | efx_for_each_tx_queue(tx_queue, efx) | |
1560 | efx_release_tx_buffers(tx_queue); | |
1561 | ||
55668611 | 1562 | if (efx_dev_registered(efx)) { |
8ceee660 BH |
1563 | strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name)); |
1564 | unregister_netdev(efx->net_dev); | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | /************************************************************************** | |
1569 | * | |
1570 | * Device reset and suspend | |
1571 | * | |
1572 | **************************************************************************/ | |
1573 | ||
1574 | /* The final hardware and software finalisation before reset. */ | |
1575 | static int efx_reset_down(struct efx_nic *efx, struct ethtool_cmd *ecmd) | |
1576 | { | |
1577 | int rc; | |
1578 | ||
1579 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1580 | ||
1581 | rc = falcon_xmac_get_settings(efx, ecmd); | |
1582 | if (rc) { | |
1583 | EFX_ERR(efx, "could not back up PHY settings\n"); | |
1584 | goto fail; | |
1585 | } | |
1586 | ||
1587 | efx_fini_channels(efx); | |
1588 | return 0; | |
1589 | ||
1590 | fail: | |
1591 | return rc; | |
1592 | } | |
1593 | ||
1594 | /* The first part of software initialisation after a hardware reset | |
1595 | * This function does not handle serialisation with the kernel, it | |
1596 | * assumes the caller has done this */ | |
1597 | static int efx_reset_up(struct efx_nic *efx, struct ethtool_cmd *ecmd) | |
1598 | { | |
1599 | int rc; | |
1600 | ||
1601 | rc = efx_init_channels(efx); | |
1602 | if (rc) | |
1603 | goto fail1; | |
1604 | ||
1605 | /* Restore MAC and PHY settings. */ | |
1606 | rc = falcon_xmac_set_settings(efx, ecmd); | |
1607 | if (rc) { | |
1608 | EFX_ERR(efx, "could not restore PHY settings\n"); | |
1609 | goto fail2; | |
1610 | } | |
1611 | ||
1612 | return 0; | |
1613 | ||
1614 | fail2: | |
1615 | efx_fini_channels(efx); | |
1616 | fail1: | |
1617 | return rc; | |
1618 | } | |
1619 | ||
1620 | /* Reset the NIC as transparently as possible. Do not reset the PHY | |
1621 | * Note that the reset may fail, in which case the card will be left | |
1622 | * in a most-probably-unusable state. | |
1623 | * | |
1624 | * This function will sleep. You cannot reset from within an atomic | |
1625 | * state; use efx_schedule_reset() instead. | |
1626 | * | |
1627 | * Grabs the rtnl_lock. | |
1628 | */ | |
1629 | static int efx_reset(struct efx_nic *efx) | |
1630 | { | |
1631 | struct ethtool_cmd ecmd; | |
1632 | enum reset_type method = efx->reset_pending; | |
1633 | int rc; | |
1634 | ||
1635 | /* Serialise with kernel interfaces */ | |
1636 | rtnl_lock(); | |
1637 | ||
1638 | /* If we're not RUNNING then don't reset. Leave the reset_pending | |
1639 | * flag set so that efx_pci_probe_main will be retried */ | |
1640 | if (efx->state != STATE_RUNNING) { | |
1641 | EFX_INFO(efx, "scheduled reset quenched. NIC not RUNNING\n"); | |
1642 | goto unlock_rtnl; | |
1643 | } | |
1644 | ||
1645 | efx->state = STATE_RESETTING; | |
1646 | EFX_INFO(efx, "resetting (%d)\n", method); | |
1647 | ||
1648 | /* The net_dev->get_stats handler is quite slow, and will fail | |
1649 | * if a fetch is pending over reset. Serialise against it. */ | |
1650 | spin_lock(&efx->stats_lock); | |
1651 | spin_unlock(&efx->stats_lock); | |
1652 | ||
1653 | efx_stop_all(efx); | |
1654 | mutex_lock(&efx->mac_lock); | |
1655 | ||
1656 | rc = efx_reset_down(efx, &ecmd); | |
1657 | if (rc) | |
1658 | goto fail1; | |
1659 | ||
1660 | rc = falcon_reset_hw(efx, method); | |
1661 | if (rc) { | |
1662 | EFX_ERR(efx, "failed to reset hardware\n"); | |
1663 | goto fail2; | |
1664 | } | |
1665 | ||
1666 | /* Allow resets to be rescheduled. */ | |
1667 | efx->reset_pending = RESET_TYPE_NONE; | |
1668 | ||
1669 | /* Reinitialise bus-mastering, which may have been turned off before | |
1670 | * the reset was scheduled. This is still appropriate, even in the | |
1671 | * RESET_TYPE_DISABLE since this driver generally assumes the hardware | |
1672 | * can respond to requests. */ | |
1673 | pci_set_master(efx->pci_dev); | |
1674 | ||
1675 | /* Reinitialise device. This is appropriate in the RESET_TYPE_DISABLE | |
1676 | * case so the driver can talk to external SRAM */ | |
1677 | rc = falcon_init_nic(efx); | |
1678 | if (rc) { | |
1679 | EFX_ERR(efx, "failed to initialise NIC\n"); | |
1680 | goto fail3; | |
1681 | } | |
1682 | ||
1683 | /* Leave device stopped if necessary */ | |
1684 | if (method == RESET_TYPE_DISABLE) { | |
1685 | /* Reinitialise the device anyway so the driver unload sequence | |
1686 | * can talk to the external SRAM */ | |
91ad757c | 1687 | falcon_init_nic(efx); |
8ceee660 BH |
1688 | rc = -EIO; |
1689 | goto fail4; | |
1690 | } | |
1691 | ||
1692 | rc = efx_reset_up(efx, &ecmd); | |
1693 | if (rc) | |
1694 | goto fail5; | |
1695 | ||
1696 | mutex_unlock(&efx->mac_lock); | |
1697 | EFX_LOG(efx, "reset complete\n"); | |
1698 | ||
1699 | efx->state = STATE_RUNNING; | |
1700 | efx_start_all(efx); | |
1701 | ||
1702 | unlock_rtnl: | |
1703 | rtnl_unlock(); | |
1704 | return 0; | |
1705 | ||
1706 | fail5: | |
1707 | fail4: | |
1708 | fail3: | |
1709 | fail2: | |
1710 | fail1: | |
1711 | EFX_ERR(efx, "has been disabled\n"); | |
1712 | efx->state = STATE_DISABLED; | |
1713 | ||
1714 | mutex_unlock(&efx->mac_lock); | |
1715 | rtnl_unlock(); | |
1716 | efx_unregister_netdev(efx); | |
1717 | efx_fini_port(efx); | |
1718 | return rc; | |
1719 | } | |
1720 | ||
1721 | /* The worker thread exists so that code that cannot sleep can | |
1722 | * schedule a reset for later. | |
1723 | */ | |
1724 | static void efx_reset_work(struct work_struct *data) | |
1725 | { | |
1726 | struct efx_nic *nic = container_of(data, struct efx_nic, reset_work); | |
1727 | ||
1728 | efx_reset(nic); | |
1729 | } | |
1730 | ||
1731 | void efx_schedule_reset(struct efx_nic *efx, enum reset_type type) | |
1732 | { | |
1733 | enum reset_type method; | |
1734 | ||
1735 | if (efx->reset_pending != RESET_TYPE_NONE) { | |
1736 | EFX_INFO(efx, "quenching already scheduled reset\n"); | |
1737 | return; | |
1738 | } | |
1739 | ||
1740 | switch (type) { | |
1741 | case RESET_TYPE_INVISIBLE: | |
1742 | case RESET_TYPE_ALL: | |
1743 | case RESET_TYPE_WORLD: | |
1744 | case RESET_TYPE_DISABLE: | |
1745 | method = type; | |
1746 | break; | |
1747 | case RESET_TYPE_RX_RECOVERY: | |
1748 | case RESET_TYPE_RX_DESC_FETCH: | |
1749 | case RESET_TYPE_TX_DESC_FETCH: | |
1750 | case RESET_TYPE_TX_SKIP: | |
1751 | method = RESET_TYPE_INVISIBLE; | |
1752 | break; | |
1753 | default: | |
1754 | method = RESET_TYPE_ALL; | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | if (method != type) | |
1759 | EFX_LOG(efx, "scheduling reset (%d:%d)\n", type, method); | |
1760 | else | |
1761 | EFX_LOG(efx, "scheduling reset (%d)\n", method); | |
1762 | ||
1763 | efx->reset_pending = method; | |
1764 | ||
8d9853d9 | 1765 | queue_work(efx->reset_workqueue, &efx->reset_work); |
8ceee660 BH |
1766 | } |
1767 | ||
1768 | /************************************************************************** | |
1769 | * | |
1770 | * List of NICs we support | |
1771 | * | |
1772 | **************************************************************************/ | |
1773 | ||
1774 | /* PCI device ID table */ | |
1775 | static struct pci_device_id efx_pci_table[] __devinitdata = { | |
1776 | {PCI_DEVICE(EFX_VENDID_SFC, FALCON_A_P_DEVID), | |
1777 | .driver_data = (unsigned long) &falcon_a_nic_type}, | |
1778 | {PCI_DEVICE(EFX_VENDID_SFC, FALCON_B_P_DEVID), | |
1779 | .driver_data = (unsigned long) &falcon_b_nic_type}, | |
1780 | {0} /* end of list */ | |
1781 | }; | |
1782 | ||
1783 | /************************************************************************** | |
1784 | * | |
1785 | * Dummy PHY/MAC/Board operations | |
1786 | * | |
1787 | * Can be used where the MAC does not implement this operation | |
1788 | * Needed so all function pointers are valid and do not have to be tested | |
1789 | * before use | |
1790 | * | |
1791 | **************************************************************************/ | |
1792 | int efx_port_dummy_op_int(struct efx_nic *efx) | |
1793 | { | |
1794 | return 0; | |
1795 | } | |
1796 | void efx_port_dummy_op_void(struct efx_nic *efx) {} | |
1797 | void efx_port_dummy_op_blink(struct efx_nic *efx, int blink) {} | |
1798 | ||
1799 | static struct efx_phy_operations efx_dummy_phy_operations = { | |
1800 | .init = efx_port_dummy_op_int, | |
1801 | .reconfigure = efx_port_dummy_op_void, | |
1802 | .check_hw = efx_port_dummy_op_int, | |
1803 | .fini = efx_port_dummy_op_void, | |
1804 | .clear_interrupt = efx_port_dummy_op_void, | |
1805 | .reset_xaui = efx_port_dummy_op_void, | |
1806 | }; | |
1807 | ||
1808 | /* Dummy board operations */ | |
1809 | static int efx_nic_dummy_op_int(struct efx_nic *nic) | |
1810 | { | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | static struct efx_board efx_dummy_board_info = { | |
1815 | .init = efx_nic_dummy_op_int, | |
1816 | .init_leds = efx_port_dummy_op_int, | |
1817 | .set_fault_led = efx_port_dummy_op_blink, | |
37b5a603 | 1818 | .fini = efx_port_dummy_op_void, |
8ceee660 BH |
1819 | }; |
1820 | ||
1821 | /************************************************************************** | |
1822 | * | |
1823 | * Data housekeeping | |
1824 | * | |
1825 | **************************************************************************/ | |
1826 | ||
1827 | /* This zeroes out and then fills in the invariants in a struct | |
1828 | * efx_nic (including all sub-structures). | |
1829 | */ | |
1830 | static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type, | |
1831 | struct pci_dev *pci_dev, struct net_device *net_dev) | |
1832 | { | |
1833 | struct efx_channel *channel; | |
1834 | struct efx_tx_queue *tx_queue; | |
1835 | struct efx_rx_queue *rx_queue; | |
1836 | int i, rc; | |
1837 | ||
1838 | /* Initialise common structures */ | |
1839 | memset(efx, 0, sizeof(*efx)); | |
1840 | spin_lock_init(&efx->biu_lock); | |
1841 | spin_lock_init(&efx->phy_lock); | |
1842 | INIT_WORK(&efx->reset_work, efx_reset_work); | |
1843 | INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor); | |
1844 | efx->pci_dev = pci_dev; | |
1845 | efx->state = STATE_INIT; | |
1846 | efx->reset_pending = RESET_TYPE_NONE; | |
1847 | strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name)); | |
1848 | efx->board_info = efx_dummy_board_info; | |
1849 | ||
1850 | efx->net_dev = net_dev; | |
1851 | efx->rx_checksum_enabled = 1; | |
1852 | spin_lock_init(&efx->netif_stop_lock); | |
1853 | spin_lock_init(&efx->stats_lock); | |
1854 | mutex_init(&efx->mac_lock); | |
1855 | efx->phy_op = &efx_dummy_phy_operations; | |
1856 | efx->mii.dev = net_dev; | |
1857 | INIT_WORK(&efx->reconfigure_work, efx_reconfigure_work); | |
1858 | atomic_set(&efx->netif_stop_count, 1); | |
1859 | ||
1860 | for (i = 0; i < EFX_MAX_CHANNELS; i++) { | |
1861 | channel = &efx->channel[i]; | |
1862 | channel->efx = efx; | |
1863 | channel->channel = i; | |
1864 | channel->evqnum = i; | |
1865 | channel->work_pending = 0; | |
1866 | } | |
1867 | for (i = 0; i < EFX_MAX_TX_QUEUES; i++) { | |
1868 | tx_queue = &efx->tx_queue[i]; | |
1869 | tx_queue->efx = efx; | |
1870 | tx_queue->queue = i; | |
1871 | tx_queue->buffer = NULL; | |
1872 | tx_queue->channel = &efx->channel[0]; /* for safety */ | |
b9b39b62 | 1873 | tx_queue->tso_headers_free = NULL; |
8ceee660 BH |
1874 | } |
1875 | for (i = 0; i < EFX_MAX_RX_QUEUES; i++) { | |
1876 | rx_queue = &efx->rx_queue[i]; | |
1877 | rx_queue->efx = efx; | |
1878 | rx_queue->queue = i; | |
1879 | rx_queue->channel = &efx->channel[0]; /* for safety */ | |
1880 | rx_queue->buffer = NULL; | |
1881 | spin_lock_init(&rx_queue->add_lock); | |
1882 | INIT_DELAYED_WORK(&rx_queue->work, efx_rx_work); | |
1883 | } | |
1884 | ||
1885 | efx->type = type; | |
1886 | ||
1887 | /* Sanity-check NIC type */ | |
1888 | EFX_BUG_ON_PARANOID(efx->type->txd_ring_mask & | |
1889 | (efx->type->txd_ring_mask + 1)); | |
1890 | EFX_BUG_ON_PARANOID(efx->type->rxd_ring_mask & | |
1891 | (efx->type->rxd_ring_mask + 1)); | |
1892 | EFX_BUG_ON_PARANOID(efx->type->evq_size & | |
1893 | (efx->type->evq_size - 1)); | |
1894 | /* As close as we can get to guaranteeing that we don't overflow */ | |
1895 | EFX_BUG_ON_PARANOID(efx->type->evq_size < | |
1896 | (efx->type->txd_ring_mask + 1 + | |
1897 | efx->type->rxd_ring_mask + 1)); | |
1898 | EFX_BUG_ON_PARANOID(efx->type->phys_addr_channels > EFX_MAX_CHANNELS); | |
1899 | ||
1900 | /* Higher numbered interrupt modes are less capable! */ | |
1901 | efx->interrupt_mode = max(efx->type->max_interrupt_mode, | |
1902 | interrupt_mode); | |
1903 | ||
1904 | efx->workqueue = create_singlethread_workqueue("sfc_work"); | |
1905 | if (!efx->workqueue) { | |
1906 | rc = -ENOMEM; | |
1907 | goto fail1; | |
1908 | } | |
1909 | ||
8d9853d9 BH |
1910 | efx->reset_workqueue = create_singlethread_workqueue("sfc_reset"); |
1911 | if (!efx->reset_workqueue) { | |
1912 | rc = -ENOMEM; | |
1913 | goto fail2; | |
1914 | } | |
1915 | ||
8ceee660 BH |
1916 | return 0; |
1917 | ||
8d9853d9 BH |
1918 | fail2: |
1919 | destroy_workqueue(efx->workqueue); | |
1920 | efx->workqueue = NULL; | |
1921 | ||
8ceee660 BH |
1922 | fail1: |
1923 | return rc; | |
1924 | } | |
1925 | ||
1926 | static void efx_fini_struct(struct efx_nic *efx) | |
1927 | { | |
8d9853d9 BH |
1928 | if (efx->reset_workqueue) { |
1929 | destroy_workqueue(efx->reset_workqueue); | |
1930 | efx->reset_workqueue = NULL; | |
1931 | } | |
8ceee660 BH |
1932 | if (efx->workqueue) { |
1933 | destroy_workqueue(efx->workqueue); | |
1934 | efx->workqueue = NULL; | |
1935 | } | |
1936 | } | |
1937 | ||
1938 | /************************************************************************** | |
1939 | * | |
1940 | * PCI interface | |
1941 | * | |
1942 | **************************************************************************/ | |
1943 | ||
1944 | /* Main body of final NIC shutdown code | |
1945 | * This is called only at module unload (or hotplug removal). | |
1946 | */ | |
1947 | static void efx_pci_remove_main(struct efx_nic *efx) | |
1948 | { | |
1949 | EFX_ASSERT_RESET_SERIALISED(efx); | |
1950 | ||
1951 | /* Skip everything if we never obtained a valid membase */ | |
1952 | if (!efx->membase) | |
1953 | return; | |
1954 | ||
1955 | efx_fini_channels(efx); | |
1956 | efx_fini_port(efx); | |
1957 | ||
1958 | /* Shutdown the board, then the NIC and board state */ | |
37b5a603 | 1959 | efx->board_info.fini(efx); |
8ceee660 BH |
1960 | falcon_fini_interrupt(efx); |
1961 | ||
1962 | efx_fini_napi(efx); | |
1963 | efx_remove_all(efx); | |
1964 | } | |
1965 | ||
1966 | /* Final NIC shutdown | |
1967 | * This is called only at module unload (or hotplug removal). | |
1968 | */ | |
1969 | static void efx_pci_remove(struct pci_dev *pci_dev) | |
1970 | { | |
1971 | struct efx_nic *efx; | |
1972 | ||
1973 | efx = pci_get_drvdata(pci_dev); | |
1974 | if (!efx) | |
1975 | return; | |
1976 | ||
1977 | /* Mark the NIC as fini, then stop the interface */ | |
1978 | rtnl_lock(); | |
1979 | efx->state = STATE_FINI; | |
1980 | dev_close(efx->net_dev); | |
1981 | ||
1982 | /* Allow any queued efx_resets() to complete */ | |
1983 | rtnl_unlock(); | |
1984 | ||
1985 | if (efx->membase == NULL) | |
1986 | goto out; | |
1987 | ||
1988 | efx_unregister_netdev(efx); | |
1989 | ||
1990 | /* Wait for any scheduled resets to complete. No more will be | |
1991 | * scheduled from this point because efx_stop_all() has been | |
1992 | * called, we are no longer registered with driverlink, and | |
1993 | * the net_device's have been removed. */ | |
8d9853d9 | 1994 | flush_workqueue(efx->reset_workqueue); |
8ceee660 BH |
1995 | |
1996 | efx_pci_remove_main(efx); | |
1997 | ||
1998 | out: | |
1999 | efx_fini_io(efx); | |
2000 | EFX_LOG(efx, "shutdown successful\n"); | |
2001 | ||
2002 | pci_set_drvdata(pci_dev, NULL); | |
2003 | efx_fini_struct(efx); | |
2004 | free_netdev(efx->net_dev); | |
2005 | }; | |
2006 | ||
2007 | /* Main body of NIC initialisation | |
2008 | * This is called at module load (or hotplug insertion, theoretically). | |
2009 | */ | |
2010 | static int efx_pci_probe_main(struct efx_nic *efx) | |
2011 | { | |
2012 | int rc; | |
2013 | ||
2014 | /* Do start-of-day initialisation */ | |
2015 | rc = efx_probe_all(efx); | |
2016 | if (rc) | |
2017 | goto fail1; | |
2018 | ||
2019 | rc = efx_init_napi(efx); | |
2020 | if (rc) | |
2021 | goto fail2; | |
2022 | ||
2023 | /* Initialise the board */ | |
2024 | rc = efx->board_info.init(efx); | |
2025 | if (rc) { | |
2026 | EFX_ERR(efx, "failed to initialise board\n"); | |
2027 | goto fail3; | |
2028 | } | |
2029 | ||
2030 | rc = falcon_init_nic(efx); | |
2031 | if (rc) { | |
2032 | EFX_ERR(efx, "failed to initialise NIC\n"); | |
2033 | goto fail4; | |
2034 | } | |
2035 | ||
2036 | rc = efx_init_port(efx); | |
2037 | if (rc) { | |
2038 | EFX_ERR(efx, "failed to initialise port\n"); | |
2039 | goto fail5; | |
2040 | } | |
2041 | ||
2042 | rc = efx_init_channels(efx); | |
2043 | if (rc) | |
2044 | goto fail6; | |
2045 | ||
2046 | rc = falcon_init_interrupt(efx); | |
2047 | if (rc) | |
2048 | goto fail7; | |
2049 | ||
2050 | return 0; | |
2051 | ||
2052 | fail7: | |
2053 | efx_fini_channels(efx); | |
2054 | fail6: | |
2055 | efx_fini_port(efx); | |
2056 | fail5: | |
2057 | fail4: | |
2058 | fail3: | |
2059 | efx_fini_napi(efx); | |
2060 | fail2: | |
2061 | efx_remove_all(efx); | |
2062 | fail1: | |
2063 | return rc; | |
2064 | } | |
2065 | ||
2066 | /* NIC initialisation | |
2067 | * | |
2068 | * This is called at module load (or hotplug insertion, | |
2069 | * theoretically). It sets up PCI mappings, tests and resets the NIC, | |
2070 | * sets up and registers the network devices with the kernel and hooks | |
2071 | * the interrupt service routine. It does not prepare the device for | |
2072 | * transmission; this is left to the first time one of the network | |
2073 | * interfaces is brought up (i.e. efx_net_open). | |
2074 | */ | |
2075 | static int __devinit efx_pci_probe(struct pci_dev *pci_dev, | |
2076 | const struct pci_device_id *entry) | |
2077 | { | |
2078 | struct efx_nic_type *type = (struct efx_nic_type *) entry->driver_data; | |
2079 | struct net_device *net_dev; | |
2080 | struct efx_nic *efx; | |
2081 | int i, rc; | |
2082 | ||
2083 | /* Allocate and initialise a struct net_device and struct efx_nic */ | |
2084 | net_dev = alloc_etherdev(sizeof(*efx)); | |
2085 | if (!net_dev) | |
2086 | return -ENOMEM; | |
b9b39b62 BH |
2087 | net_dev->features |= (NETIF_F_IP_CSUM | NETIF_F_SG | |
2088 | NETIF_F_HIGHDMA | NETIF_F_TSO); | |
8ceee660 BH |
2089 | if (lro) |
2090 | net_dev->features |= NETIF_F_LRO; | |
2091 | efx = net_dev->priv; | |
2092 | pci_set_drvdata(pci_dev, efx); | |
2093 | rc = efx_init_struct(efx, type, pci_dev, net_dev); | |
2094 | if (rc) | |
2095 | goto fail1; | |
2096 | ||
2097 | EFX_INFO(efx, "Solarflare Communications NIC detected\n"); | |
2098 | ||
2099 | /* Set up basic I/O (BAR mappings etc) */ | |
2100 | rc = efx_init_io(efx); | |
2101 | if (rc) | |
2102 | goto fail2; | |
2103 | ||
2104 | /* No serialisation is required with the reset path because | |
2105 | * we're in STATE_INIT. */ | |
2106 | for (i = 0; i < 5; i++) { | |
2107 | rc = efx_pci_probe_main(efx); | |
2108 | if (rc == 0) | |
2109 | break; | |
2110 | ||
2111 | /* Serialise against efx_reset(). No more resets will be | |
2112 | * scheduled since efx_stop_all() has been called, and we | |
2113 | * have not and never have been registered with either | |
2114 | * the rtnetlink or driverlink layers. */ | |
8d9853d9 | 2115 | flush_workqueue(efx->reset_workqueue); |
8ceee660 BH |
2116 | |
2117 | /* Retry if a recoverably reset event has been scheduled */ | |
2118 | if ((efx->reset_pending != RESET_TYPE_INVISIBLE) && | |
2119 | (efx->reset_pending != RESET_TYPE_ALL)) | |
2120 | goto fail3; | |
2121 | ||
2122 | efx->reset_pending = RESET_TYPE_NONE; | |
2123 | } | |
2124 | ||
2125 | if (rc) { | |
2126 | EFX_ERR(efx, "Could not reset NIC\n"); | |
2127 | goto fail4; | |
2128 | } | |
2129 | ||
2130 | /* Switch to the running state before we expose the device to | |
2131 | * the OS. This is to ensure that the initial gathering of | |
2132 | * MAC stats succeeds. */ | |
2133 | rtnl_lock(); | |
2134 | efx->state = STATE_RUNNING; | |
2135 | rtnl_unlock(); | |
2136 | ||
2137 | rc = efx_register_netdev(efx); | |
2138 | if (rc) | |
2139 | goto fail5; | |
2140 | ||
2141 | EFX_LOG(efx, "initialisation successful\n"); | |
2142 | ||
2143 | return 0; | |
2144 | ||
2145 | fail5: | |
2146 | efx_pci_remove_main(efx); | |
2147 | fail4: | |
2148 | fail3: | |
2149 | efx_fini_io(efx); | |
2150 | fail2: | |
2151 | efx_fini_struct(efx); | |
2152 | fail1: | |
2153 | EFX_LOG(efx, "initialisation failed. rc=%d\n", rc); | |
2154 | free_netdev(net_dev); | |
2155 | return rc; | |
2156 | } | |
2157 | ||
2158 | static struct pci_driver efx_pci_driver = { | |
2159 | .name = EFX_DRIVER_NAME, | |
2160 | .id_table = efx_pci_table, | |
2161 | .probe = efx_pci_probe, | |
2162 | .remove = efx_pci_remove, | |
2163 | }; | |
2164 | ||
2165 | /************************************************************************** | |
2166 | * | |
2167 | * Kernel module interface | |
2168 | * | |
2169 | *************************************************************************/ | |
2170 | ||
2171 | module_param(interrupt_mode, uint, 0444); | |
2172 | MODULE_PARM_DESC(interrupt_mode, | |
2173 | "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)"); | |
2174 | ||
2175 | static int __init efx_init_module(void) | |
2176 | { | |
2177 | int rc; | |
2178 | ||
2179 | printk(KERN_INFO "Solarflare NET driver v" EFX_DRIVER_VERSION "\n"); | |
2180 | ||
2181 | rc = register_netdevice_notifier(&efx_netdev_notifier); | |
2182 | if (rc) | |
2183 | goto err_notifier; | |
2184 | ||
2185 | refill_workqueue = create_workqueue("sfc_refill"); | |
2186 | if (!refill_workqueue) { | |
2187 | rc = -ENOMEM; | |
2188 | goto err_refill; | |
2189 | } | |
2190 | ||
2191 | rc = pci_register_driver(&efx_pci_driver); | |
2192 | if (rc < 0) | |
2193 | goto err_pci; | |
2194 | ||
2195 | return 0; | |
2196 | ||
2197 | err_pci: | |
2198 | destroy_workqueue(refill_workqueue); | |
2199 | err_refill: | |
2200 | unregister_netdevice_notifier(&efx_netdev_notifier); | |
2201 | err_notifier: | |
2202 | return rc; | |
2203 | } | |
2204 | ||
2205 | static void __exit efx_exit_module(void) | |
2206 | { | |
2207 | printk(KERN_INFO "Solarflare NET driver unloading\n"); | |
2208 | ||
2209 | pci_unregister_driver(&efx_pci_driver); | |
2210 | destroy_workqueue(refill_workqueue); | |
2211 | unregister_netdevice_notifier(&efx_netdev_notifier); | |
2212 | ||
2213 | } | |
2214 | ||
2215 | module_init(efx_init_module); | |
2216 | module_exit(efx_exit_module); | |
2217 | ||
2218 | MODULE_AUTHOR("Michael Brown <mbrown@fensystems.co.uk> and " | |
2219 | "Solarflare Communications"); | |
2220 | MODULE_DESCRIPTION("Solarflare Communications network driver"); | |
2221 | MODULE_LICENSE("GPL"); | |
2222 | MODULE_DEVICE_TABLE(pci, efx_pci_table); |