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2eecd2873c79686eae669a9d49ce1588c86f219f
[deliverable/linux.git] / drivers / net / ethernet / sfc / efx.c
1 /****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2005-2013 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/ethtool.h>
21 #include <linux/topology.h>
22 #include <linux/gfp.h>
23 #include <linux/aer.h>
24 #include <linux/interrupt.h>
25 #include "net_driver.h"
26 #include "efx.h"
27 #include "nic.h"
28 #include "selftest.h"
29 #include "sriov.h"
30
31 #include "mcdi.h"
32 #include "workarounds.h"
33
34 /**************************************************************************
35 *
36 * Type name strings
37 *
38 **************************************************************************
39 */
40
41 /* Loopback mode names (see LOOPBACK_MODE()) */
42 const unsigned int efx_loopback_mode_max = LOOPBACK_MAX;
43 const char *const efx_loopback_mode_names[] = {
44 [LOOPBACK_NONE] = "NONE",
45 [LOOPBACK_DATA] = "DATAPATH",
46 [LOOPBACK_GMAC] = "GMAC",
47 [LOOPBACK_XGMII] = "XGMII",
48 [LOOPBACK_XGXS] = "XGXS",
49 [LOOPBACK_XAUI] = "XAUI",
50 [LOOPBACK_GMII] = "GMII",
51 [LOOPBACK_SGMII] = "SGMII",
52 [LOOPBACK_XGBR] = "XGBR",
53 [LOOPBACK_XFI] = "XFI",
54 [LOOPBACK_XAUI_FAR] = "XAUI_FAR",
55 [LOOPBACK_GMII_FAR] = "GMII_FAR",
56 [LOOPBACK_SGMII_FAR] = "SGMII_FAR",
57 [LOOPBACK_XFI_FAR] = "XFI_FAR",
58 [LOOPBACK_GPHY] = "GPHY",
59 [LOOPBACK_PHYXS] = "PHYXS",
60 [LOOPBACK_PCS] = "PCS",
61 [LOOPBACK_PMAPMD] = "PMA/PMD",
62 [LOOPBACK_XPORT] = "XPORT",
63 [LOOPBACK_XGMII_WS] = "XGMII_WS",
64 [LOOPBACK_XAUI_WS] = "XAUI_WS",
65 [LOOPBACK_XAUI_WS_FAR] = "XAUI_WS_FAR",
66 [LOOPBACK_XAUI_WS_NEAR] = "XAUI_WS_NEAR",
67 [LOOPBACK_GMII_WS] = "GMII_WS",
68 [LOOPBACK_XFI_WS] = "XFI_WS",
69 [LOOPBACK_XFI_WS_FAR] = "XFI_WS_FAR",
70 [LOOPBACK_PHYXS_WS] = "PHYXS_WS",
71 };
72
73 const unsigned int efx_reset_type_max = RESET_TYPE_MAX;
74 const char *const efx_reset_type_names[] = {
75 [RESET_TYPE_INVISIBLE] = "INVISIBLE",
76 [RESET_TYPE_ALL] = "ALL",
77 [RESET_TYPE_RECOVER_OR_ALL] = "RECOVER_OR_ALL",
78 [RESET_TYPE_WORLD] = "WORLD",
79 [RESET_TYPE_RECOVER_OR_DISABLE] = "RECOVER_OR_DISABLE",
80 [RESET_TYPE_DATAPATH] = "DATAPATH",
81 [RESET_TYPE_MC_BIST] = "MC_BIST",
82 [RESET_TYPE_DISABLE] = "DISABLE",
83 [RESET_TYPE_TX_WATCHDOG] = "TX_WATCHDOG",
84 [RESET_TYPE_INT_ERROR] = "INT_ERROR",
85 [RESET_TYPE_RX_RECOVERY] = "RX_RECOVERY",
86 [RESET_TYPE_DMA_ERROR] = "DMA_ERROR",
87 [RESET_TYPE_TX_SKIP] = "TX_SKIP",
88 [RESET_TYPE_MC_FAILURE] = "MC_FAILURE",
89 [RESET_TYPE_MCDI_TIMEOUT] = "MCDI_TIMEOUT (FLR)",
90 };
91
92 /* Reset workqueue. If any NIC has a hardware failure then a reset will be
93 * queued onto this work queue. This is not a per-nic work queue, because
94 * efx_reset_work() acquires the rtnl lock, so resets are naturally serialised.
95 */
96 static struct workqueue_struct *reset_workqueue;
97
98 /* How often and how many times to poll for a reset while waiting for a
99 * BIST that another function started to complete.
100 */
101 #define BIST_WAIT_DELAY_MS 100
102 #define BIST_WAIT_DELAY_COUNT 100
103
104 /**************************************************************************
105 *
106 * Configurable values
107 *
108 *************************************************************************/
109
110 /*
111 * Use separate channels for TX and RX events
112 *
113 * Set this to 1 to use separate channels for TX and RX. It allows us
114 * to control interrupt affinity separately for TX and RX.
115 *
116 * This is only used in MSI-X interrupt mode
117 */
118 bool efx_separate_tx_channels;
119 module_param(efx_separate_tx_channels, bool, 0444);
120 MODULE_PARM_DESC(efx_separate_tx_channels,
121 "Use separate channels for TX and RX");
122
123 /* This is the weight assigned to each of the (per-channel) virtual
124 * NAPI devices.
125 */
126 static int napi_weight = 64;
127
128 /* This is the time (in jiffies) between invocations of the hardware
129 * monitor.
130 * On Falcon-based NICs, this will:
131 * - Check the on-board hardware monitor;
132 * - Poll the link state and reconfigure the hardware as necessary.
133 * On Siena-based NICs for power systems with EEH support, this will give EEH a
134 * chance to start.
135 */
136 static unsigned int efx_monitor_interval = 1 * HZ;
137
138 /* Initial interrupt moderation settings. They can be modified after
139 * module load with ethtool.
140 *
141 * The default for RX should strike a balance between increasing the
142 * round-trip latency and reducing overhead.
143 */
144 static unsigned int rx_irq_mod_usec = 60;
145
146 /* Initial interrupt moderation settings. They can be modified after
147 * module load with ethtool.
148 *
149 * This default is chosen to ensure that a 10G link does not go idle
150 * while a TX queue is stopped after it has become full. A queue is
151 * restarted when it drops below half full. The time this takes (assuming
152 * worst case 3 descriptors per packet and 1024 descriptors) is
153 * 512 / 3 * 1.2 = 205 usec.
154 */
155 static unsigned int tx_irq_mod_usec = 150;
156
157 /* This is the first interrupt mode to try out of:
158 * 0 => MSI-X
159 * 1 => MSI
160 * 2 => legacy
161 */
162 static unsigned int interrupt_mode;
163
164 /* This is the requested number of CPUs to use for Receive-Side Scaling (RSS),
165 * i.e. the number of CPUs among which we may distribute simultaneous
166 * interrupt handling.
167 *
168 * Cards without MSI-X will only target one CPU via legacy or MSI interrupt.
169 * The default (0) means to assign an interrupt to each core.
170 */
171 static unsigned int rss_cpus;
172 module_param(rss_cpus, uint, 0444);
173 MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling");
174
175 static bool phy_flash_cfg;
176 module_param(phy_flash_cfg, bool, 0644);
177 MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");
178
179 static unsigned irq_adapt_low_thresh = 8000;
180 module_param(irq_adapt_low_thresh, uint, 0644);
181 MODULE_PARM_DESC(irq_adapt_low_thresh,
182 "Threshold score for reducing IRQ moderation");
183
184 static unsigned irq_adapt_high_thresh = 16000;
185 module_param(irq_adapt_high_thresh, uint, 0644);
186 MODULE_PARM_DESC(irq_adapt_high_thresh,
187 "Threshold score for increasing IRQ moderation");
188
189 static unsigned debug = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
190 NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
191 NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
192 NETIF_MSG_TX_ERR | NETIF_MSG_HW);
193 module_param(debug, uint, 0);
194 MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");
195
196 /**************************************************************************
197 *
198 * Utility functions and prototypes
199 *
200 *************************************************************************/
201
202 static int efx_soft_enable_interrupts(struct efx_nic *efx);
203 static void efx_soft_disable_interrupts(struct efx_nic *efx);
204 static void efx_remove_channel(struct efx_channel *channel);
205 static void efx_remove_channels(struct efx_nic *efx);
206 static const struct efx_channel_type efx_default_channel_type;
207 static void efx_remove_port(struct efx_nic *efx);
208 static void efx_init_napi_channel(struct efx_channel *channel);
209 static void efx_fini_napi(struct efx_nic *efx);
210 static void efx_fini_napi_channel(struct efx_channel *channel);
211 static void efx_fini_struct(struct efx_nic *efx);
212 static void efx_start_all(struct efx_nic *efx);
213 static void efx_stop_all(struct efx_nic *efx);
214
215 #define EFX_ASSERT_RESET_SERIALISED(efx) \
216 do { \
217 if ((efx->state == STATE_READY) || \
218 (efx->state == STATE_RECOVERY) || \
219 (efx->state == STATE_DISABLED)) \
220 ASSERT_RTNL(); \
221 } while (0)
222
223 static int efx_check_disabled(struct efx_nic *efx)
224 {
225 if (efx->state == STATE_DISABLED || efx->state == STATE_RECOVERY) {
226 netif_err(efx, drv, efx->net_dev,
227 "device is disabled due to earlier errors\n");
228 return -EIO;
229 }
230 return 0;
231 }
232
233 /**************************************************************************
234 *
235 * Event queue processing
236 *
237 *************************************************************************/
238
239 /* Process channel's event queue
240 *
241 * This function is responsible for processing the event queue of a
242 * single channel. The caller must guarantee that this function will
243 * never be concurrently called more than once on the same channel,
244 * though different channels may be being processed concurrently.
245 */
246 static int efx_process_channel(struct efx_channel *channel, int budget)
247 {
248 struct efx_tx_queue *tx_queue;
249 int spent;
250
251 if (unlikely(!channel->enabled))
252 return 0;
253
254 efx_for_each_channel_tx_queue(tx_queue, channel) {
255 tx_queue->pkts_compl = 0;
256 tx_queue->bytes_compl = 0;
257 }
258
259 spent = efx_nic_process_eventq(channel, budget);
260 if (spent && efx_channel_has_rx_queue(channel)) {
261 struct efx_rx_queue *rx_queue =
262 efx_channel_get_rx_queue(channel);
263
264 efx_rx_flush_packet(channel);
265 efx_fast_push_rx_descriptors(rx_queue, true);
266 }
267
268 /* Update BQL */
269 efx_for_each_channel_tx_queue(tx_queue, channel) {
270 if (tx_queue->bytes_compl) {
271 netdev_tx_completed_queue(tx_queue->core_txq,
272 tx_queue->pkts_compl, tx_queue->bytes_compl);
273 }
274 }
275
276 return spent;
277 }
278
279 /* NAPI poll handler
280 *
281 * NAPI guarantees serialisation of polls of the same device, which
282 * provides the guarantee required by efx_process_channel().
283 */
284 static int efx_poll(struct napi_struct *napi, int budget)
285 {
286 struct efx_channel *channel =
287 container_of(napi, struct efx_channel, napi_str);
288 struct efx_nic *efx = channel->efx;
289 int spent;
290
291 if (!efx_channel_lock_napi(channel))
292 return budget;
293
294 netif_vdbg(efx, intr, efx->net_dev,
295 "channel %d NAPI poll executing on CPU %d\n",
296 channel->channel, raw_smp_processor_id());
297
298 spent = efx_process_channel(channel, budget);
299
300 if (spent < budget) {
301 if (efx_channel_has_rx_queue(channel) &&
302 efx->irq_rx_adaptive &&
303 unlikely(++channel->irq_count == 1000)) {
304 if (unlikely(channel->irq_mod_score <
305 irq_adapt_low_thresh)) {
306 if (channel->irq_moderation > 1) {
307 channel->irq_moderation -= 1;
308 efx->type->push_irq_moderation(channel);
309 }
310 } else if (unlikely(channel->irq_mod_score >
311 irq_adapt_high_thresh)) {
312 if (channel->irq_moderation <
313 efx->irq_rx_moderation) {
314 channel->irq_moderation += 1;
315 efx->type->push_irq_moderation(channel);
316 }
317 }
318 channel->irq_count = 0;
319 channel->irq_mod_score = 0;
320 }
321
322 efx_filter_rfs_expire(channel);
323
324 /* There is no race here; although napi_disable() will
325 * only wait for napi_complete(), this isn't a problem
326 * since efx_nic_eventq_read_ack() will have no effect if
327 * interrupts have already been disabled.
328 */
329 napi_complete(napi);
330 efx_nic_eventq_read_ack(channel);
331 }
332
333 efx_channel_unlock_napi(channel);
334 return spent;
335 }
336
337 /* Create event queue
338 * Event queue memory allocations are done only once. If the channel
339 * is reset, the memory buffer will be reused; this guards against
340 * errors during channel reset and also simplifies interrupt handling.
341 */
342 static int efx_probe_eventq(struct efx_channel *channel)
343 {
344 struct efx_nic *efx = channel->efx;
345 unsigned long entries;
346
347 netif_dbg(efx, probe, efx->net_dev,
348 "chan %d create event queue\n", channel->channel);
349
350 /* Build an event queue with room for one event per tx and rx buffer,
351 * plus some extra for link state events and MCDI completions. */
352 entries = roundup_pow_of_two(efx->rxq_entries + efx->txq_entries + 128);
353 EFX_BUG_ON_PARANOID(entries > EFX_MAX_EVQ_SIZE);
354 channel->eventq_mask = max(entries, EFX_MIN_EVQ_SIZE) - 1;
355
356 return efx_nic_probe_eventq(channel);
357 }
358
359 /* Prepare channel's event queue */
360 static int efx_init_eventq(struct efx_channel *channel)
361 {
362 struct efx_nic *efx = channel->efx;
363 int rc;
364
365 EFX_WARN_ON_PARANOID(channel->eventq_init);
366
367 netif_dbg(efx, drv, efx->net_dev,
368 "chan %d init event queue\n", channel->channel);
369
370 rc = efx_nic_init_eventq(channel);
371 if (rc == 0) {
372 efx->type->push_irq_moderation(channel);
373 channel->eventq_read_ptr = 0;
374 channel->eventq_init = true;
375 }
376 return rc;
377 }
378
379 /* Enable event queue processing and NAPI */
380 void efx_start_eventq(struct efx_channel *channel)
381 {
382 netif_dbg(channel->efx, ifup, channel->efx->net_dev,
383 "chan %d start event queue\n", channel->channel);
384
385 /* Make sure the NAPI handler sees the enabled flag set */
386 channel->enabled = true;
387 smp_wmb();
388
389 efx_channel_enable(channel);
390 napi_enable(&channel->napi_str);
391 efx_nic_eventq_read_ack(channel);
392 }
393
394 /* Disable event queue processing and NAPI */
395 void efx_stop_eventq(struct efx_channel *channel)
396 {
397 if (!channel->enabled)
398 return;
399
400 napi_disable(&channel->napi_str);
401 while (!efx_channel_disable(channel))
402 usleep_range(1000, 20000);
403 channel->enabled = false;
404 }
405
406 static void efx_fini_eventq(struct efx_channel *channel)
407 {
408 if (!channel->eventq_init)
409 return;
410
411 netif_dbg(channel->efx, drv, channel->efx->net_dev,
412 "chan %d fini event queue\n", channel->channel);
413
414 efx_nic_fini_eventq(channel);
415 channel->eventq_init = false;
416 }
417
418 static void efx_remove_eventq(struct efx_channel *channel)
419 {
420 netif_dbg(channel->efx, drv, channel->efx->net_dev,
421 "chan %d remove event queue\n", channel->channel);
422
423 efx_nic_remove_eventq(channel);
424 }
425
426 /**************************************************************************
427 *
428 * Channel handling
429 *
430 *************************************************************************/
431
432 /* Allocate and initialise a channel structure. */
433 static struct efx_channel *
434 efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
435 {
436 struct efx_channel *channel;
437 struct efx_rx_queue *rx_queue;
438 struct efx_tx_queue *tx_queue;
439 int j;
440
441 channel = kzalloc(sizeof(*channel), GFP_KERNEL);
442 if (!channel)
443 return NULL;
444
445 channel->efx = efx;
446 channel->channel = i;
447 channel->type = &efx_default_channel_type;
448
449 for (j = 0; j < EFX_TXQ_TYPES; j++) {
450 tx_queue = &channel->tx_queue[j];
451 tx_queue->efx = efx;
452 tx_queue->queue = i * EFX_TXQ_TYPES + j;
453 tx_queue->channel = channel;
454 }
455
456 rx_queue = &channel->rx_queue;
457 rx_queue->efx = efx;
458 setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
459 (unsigned long)rx_queue);
460
461 return channel;
462 }
463
464 /* Allocate and initialise a channel structure, copying parameters
465 * (but not resources) from an old channel structure.
466 */
467 static struct efx_channel *
468 efx_copy_channel(const struct efx_channel *old_channel)
469 {
470 struct efx_channel *channel;
471 struct efx_rx_queue *rx_queue;
472 struct efx_tx_queue *tx_queue;
473 int j;
474
475 channel = kmalloc(sizeof(*channel), GFP_KERNEL);
476 if (!channel)
477 return NULL;
478
479 *channel = *old_channel;
480
481 channel->napi_dev = NULL;
482 memset(&channel->eventq, 0, sizeof(channel->eventq));
483
484 for (j = 0; j < EFX_TXQ_TYPES; j++) {
485 tx_queue = &channel->tx_queue[j];
486 if (tx_queue->channel)
487 tx_queue->channel = channel;
488 tx_queue->buffer = NULL;
489 memset(&tx_queue->txd, 0, sizeof(tx_queue->txd));
490 }
491
492 rx_queue = &channel->rx_queue;
493 rx_queue->buffer = NULL;
494 memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
495 setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
496 (unsigned long)rx_queue);
497
498 return channel;
499 }
500
501 static int efx_probe_channel(struct efx_channel *channel)
502 {
503 struct efx_tx_queue *tx_queue;
504 struct efx_rx_queue *rx_queue;
505 int rc;
506
507 netif_dbg(channel->efx, probe, channel->efx->net_dev,
508 "creating channel %d\n", channel->channel);
509
510 rc = channel->type->pre_probe(channel);
511 if (rc)
512 goto fail;
513
514 rc = efx_probe_eventq(channel);
515 if (rc)
516 goto fail;
517
518 efx_for_each_channel_tx_queue(tx_queue, channel) {
519 rc = efx_probe_tx_queue(tx_queue);
520 if (rc)
521 goto fail;
522 }
523
524 efx_for_each_channel_rx_queue(rx_queue, channel) {
525 rc = efx_probe_rx_queue(rx_queue);
526 if (rc)
527 goto fail;
528 }
529
530 return 0;
531
532 fail:
533 efx_remove_channel(channel);
534 return rc;
535 }
536
537 static void
538 efx_get_channel_name(struct efx_channel *channel, char *buf, size_t len)
539 {
540 struct efx_nic *efx = channel->efx;
541 const char *type;
542 int number;
543
544 number = channel->channel;
545 if (efx->tx_channel_offset == 0) {
546 type = "";
547 } else if (channel->channel < efx->tx_channel_offset) {
548 type = "-rx";
549 } else {
550 type = "-tx";
551 number -= efx->tx_channel_offset;
552 }
553 snprintf(buf, len, "%s%s-%d", efx->name, type, number);
554 }
555
556 static void efx_set_channel_names(struct efx_nic *efx)
557 {
558 struct efx_channel *channel;
559
560 efx_for_each_channel(channel, efx)
561 channel->type->get_name(channel,
562 efx->msi_context[channel->channel].name,
563 sizeof(efx->msi_context[0].name));
564 }
565
566 static int efx_probe_channels(struct efx_nic *efx)
567 {
568 struct efx_channel *channel;
569 int rc;
570
571 /* Restart special buffer allocation */
572 efx->next_buffer_table = 0;
573
574 /* Probe channels in reverse, so that any 'extra' channels
575 * use the start of the buffer table. This allows the traffic
576 * channels to be resized without moving them or wasting the
577 * entries before them.
578 */
579 efx_for_each_channel_rev(channel, efx) {
580 rc = efx_probe_channel(channel);
581 if (rc) {
582 netif_err(efx, probe, efx->net_dev,
583 "failed to create channel %d\n",
584 channel->channel);
585 goto fail;
586 }
587 }
588 efx_set_channel_names(efx);
589
590 return 0;
591
592 fail:
593 efx_remove_channels(efx);
594 return rc;
595 }
596
597 /* Channels are shutdown and reinitialised whilst the NIC is running
598 * to propagate configuration changes (mtu, checksum offload), or
599 * to clear hardware error conditions
600 */
601 static void efx_start_datapath(struct efx_nic *efx)
602 {
603 netdev_features_t old_features = efx->net_dev->features;
604 bool old_rx_scatter = efx->rx_scatter;
605 struct efx_tx_queue *tx_queue;
606 struct efx_rx_queue *rx_queue;
607 struct efx_channel *channel;
608 size_t rx_buf_len;
609
610 /* Calculate the rx buffer allocation parameters required to
611 * support the current MTU, including padding for header
612 * alignment and overruns.
613 */
614 efx->rx_dma_len = (efx->rx_prefix_size +
615 EFX_MAX_FRAME_LEN(efx->net_dev->mtu) +
616 efx->type->rx_buffer_padding);
617 rx_buf_len = (sizeof(struct efx_rx_page_state) +
618 efx->rx_ip_align + efx->rx_dma_len);
619 if (rx_buf_len <= PAGE_SIZE) {
620 efx->rx_scatter = efx->type->always_rx_scatter;
621 efx->rx_buffer_order = 0;
622 } else if (efx->type->can_rx_scatter) {
623 BUILD_BUG_ON(EFX_RX_USR_BUF_SIZE % L1_CACHE_BYTES);
624 BUILD_BUG_ON(sizeof(struct efx_rx_page_state) +
625 2 * ALIGN(NET_IP_ALIGN + EFX_RX_USR_BUF_SIZE,
626 EFX_RX_BUF_ALIGNMENT) >
627 PAGE_SIZE);
628 efx->rx_scatter = true;
629 efx->rx_dma_len = EFX_RX_USR_BUF_SIZE;
630 efx->rx_buffer_order = 0;
631 } else {
632 efx->rx_scatter = false;
633 efx->rx_buffer_order = get_order(rx_buf_len);
634 }
635
636 efx_rx_config_page_split(efx);
637 if (efx->rx_buffer_order)
638 netif_dbg(efx, drv, efx->net_dev,
639 "RX buf len=%u; page order=%u batch=%u\n",
640 efx->rx_dma_len, efx->rx_buffer_order,
641 efx->rx_pages_per_batch);
642 else
643 netif_dbg(efx, drv, efx->net_dev,
644 "RX buf len=%u step=%u bpp=%u; page batch=%u\n",
645 efx->rx_dma_len, efx->rx_page_buf_step,
646 efx->rx_bufs_per_page, efx->rx_pages_per_batch);
647
648 /* Restore previously fixed features in hw_features and remove
649 * features which are fixed now
650 */
651 efx->net_dev->hw_features |= efx->net_dev->features;
652 efx->net_dev->hw_features &= ~efx->fixed_features;
653 efx->net_dev->features |= efx->fixed_features;
654 if (efx->net_dev->features != old_features)
655 netdev_features_change(efx->net_dev);
656
657 /* RX filters may also have scatter-enabled flags */
658 if (efx->rx_scatter != old_rx_scatter)
659 efx->type->filter_update_rx_scatter(efx);
660
661 /* We must keep at least one descriptor in a TX ring empty.
662 * We could avoid this when the queue size does not exactly
663 * match the hardware ring size, but it's not that important.
664 * Therefore we stop the queue when one more skb might fill
665 * the ring completely. We wake it when half way back to
666 * empty.
667 */
668 efx->txq_stop_thresh = efx->txq_entries - efx_tx_max_skb_descs(efx);
669 efx->txq_wake_thresh = efx->txq_stop_thresh / 2;
670
671 /* Initialise the channels */
672 efx_for_each_channel(channel, efx) {
673 efx_for_each_channel_tx_queue(tx_queue, channel) {
674 efx_init_tx_queue(tx_queue);
675 atomic_inc(&efx->active_queues);
676 }
677
678 efx_for_each_channel_rx_queue(rx_queue, channel) {
679 efx_init_rx_queue(rx_queue);
680 atomic_inc(&efx->active_queues);
681 efx_stop_eventq(channel);
682 efx_fast_push_rx_descriptors(rx_queue, false);
683 efx_start_eventq(channel);
684 }
685
686 WARN_ON(channel->rx_pkt_n_frags);
687 }
688
689 efx_ptp_start_datapath(efx);
690
691 if (netif_device_present(efx->net_dev))
692 netif_tx_wake_all_queues(efx->net_dev);
693 }
694
695 static void efx_stop_datapath(struct efx_nic *efx)
696 {
697 struct efx_channel *channel;
698 struct efx_tx_queue *tx_queue;
699 struct efx_rx_queue *rx_queue;
700 int rc;
701
702 EFX_ASSERT_RESET_SERIALISED(efx);
703 BUG_ON(efx->port_enabled);
704
705 efx_ptp_stop_datapath(efx);
706
707 /* Stop RX refill */
708 efx_for_each_channel(channel, efx) {
709 efx_for_each_channel_rx_queue(rx_queue, channel)
710 rx_queue->refill_enabled = false;
711 }
712
713 efx_for_each_channel(channel, efx) {
714 /* RX packet processing is pipelined, so wait for the
715 * NAPI handler to complete. At least event queue 0
716 * might be kept active by non-data events, so don't
717 * use napi_synchronize() but actually disable NAPI
718 * temporarily.
719 */
720 if (efx_channel_has_rx_queue(channel)) {
721 efx_stop_eventq(channel);
722 efx_start_eventq(channel);
723 }
724 }
725
726 rc = efx->type->fini_dmaq(efx);
727 if (rc && EFX_WORKAROUND_7803(efx)) {
728 /* Schedule a reset to recover from the flush failure. The
729 * descriptor caches reference memory we're about to free,
730 * but falcon_reconfigure_mac_wrapper() won't reconnect
731 * the MACs because of the pending reset.
732 */
733 netif_err(efx, drv, efx->net_dev,
734 "Resetting to recover from flush failure\n");
735 efx_schedule_reset(efx, RESET_TYPE_ALL);
736 } else if (rc) {
737 netif_err(efx, drv, efx->net_dev, "failed to flush queues\n");
738 } else {
739 netif_dbg(efx, drv, efx->net_dev,
740 "successfully flushed all queues\n");
741 }
742
743 efx_for_each_channel(channel, efx) {
744 efx_for_each_channel_rx_queue(rx_queue, channel)
745 efx_fini_rx_queue(rx_queue);
746 efx_for_each_possible_channel_tx_queue(tx_queue, channel)
747 efx_fini_tx_queue(tx_queue);
748 }
749 }
750
751 static void efx_remove_channel(struct efx_channel *channel)
752 {
753 struct efx_tx_queue *tx_queue;
754 struct efx_rx_queue *rx_queue;
755
756 netif_dbg(channel->efx, drv, channel->efx->net_dev,
757 "destroy chan %d\n", channel->channel);
758
759 efx_for_each_channel_rx_queue(rx_queue, channel)
760 efx_remove_rx_queue(rx_queue);
761 efx_for_each_possible_channel_tx_queue(tx_queue, channel)
762 efx_remove_tx_queue(tx_queue);
763 efx_remove_eventq(channel);
764 channel->type->post_remove(channel);
765 }
766
767 static void efx_remove_channels(struct efx_nic *efx)
768 {
769 struct efx_channel *channel;
770
771 efx_for_each_channel(channel, efx)
772 efx_remove_channel(channel);
773 }
774
775 int
776 efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
777 {
778 struct efx_channel *other_channel[EFX_MAX_CHANNELS], *channel;
779 u32 old_rxq_entries, old_txq_entries;
780 unsigned i, next_buffer_table = 0;
781 int rc, rc2;
782
783 rc = efx_check_disabled(efx);
784 if (rc)
785 return rc;
786
787 /* Not all channels should be reallocated. We must avoid
788 * reallocating their buffer table entries.
789 */
790 efx_for_each_channel(channel, efx) {
791 struct efx_rx_queue *rx_queue;
792 struct efx_tx_queue *tx_queue;
793
794 if (channel->type->copy)
795 continue;
796 next_buffer_table = max(next_buffer_table,
797 channel->eventq.index +
798 channel->eventq.entries);
799 efx_for_each_channel_rx_queue(rx_queue, channel)
800 next_buffer_table = max(next_buffer_table,
801 rx_queue->rxd.index +
802 rx_queue->rxd.entries);
803 efx_for_each_channel_tx_queue(tx_queue, channel)
804 next_buffer_table = max(next_buffer_table,
805 tx_queue->txd.index +
806 tx_queue->txd.entries);
807 }
808
809 efx_device_detach_sync(efx);
810 efx_stop_all(efx);
811 efx_soft_disable_interrupts(efx);
812
813 /* Clone channels (where possible) */
814 memset(other_channel, 0, sizeof(other_channel));
815 for (i = 0; i < efx->n_channels; i++) {
816 channel = efx->channel[i];
817 if (channel->type->copy)
818 channel = channel->type->copy(channel);
819 if (!channel) {
820 rc = -ENOMEM;
821 goto out;
822 }
823 other_channel[i] = channel;
824 }
825
826 /* Swap entry counts and channel pointers */
827 old_rxq_entries = efx->rxq_entries;
828 old_txq_entries = efx->txq_entries;
829 efx->rxq_entries = rxq_entries;
830 efx->txq_entries = txq_entries;
831 for (i = 0; i < efx->n_channels; i++) {
832 channel = efx->channel[i];
833 efx->channel[i] = other_channel[i];
834 other_channel[i] = channel;
835 }
836
837 /* Restart buffer table allocation */
838 efx->next_buffer_table = next_buffer_table;
839
840 for (i = 0; i < efx->n_channels; i++) {
841 channel = efx->channel[i];
842 if (!channel->type->copy)
843 continue;
844 rc = efx_probe_channel(channel);
845 if (rc)
846 goto rollback;
847 efx_init_napi_channel(efx->channel[i]);
848 }
849
850 out:
851 /* Destroy unused channel structures */
852 for (i = 0; i < efx->n_channels; i++) {
853 channel = other_channel[i];
854 if (channel && channel->type->copy) {
855 efx_fini_napi_channel(channel);
856 efx_remove_channel(channel);
857 kfree(channel);
858 }
859 }
860
861 rc2 = efx_soft_enable_interrupts(efx);
862 if (rc2) {
863 rc = rc ? rc : rc2;
864 netif_err(efx, drv, efx->net_dev,
865 "unable to restart interrupts on channel reallocation\n");
866 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
867 } else {
868 efx_start_all(efx);
869 netif_device_attach(efx->net_dev);
870 }
871 return rc;
872
873 rollback:
874 /* Swap back */
875 efx->rxq_entries = old_rxq_entries;
876 efx->txq_entries = old_txq_entries;
877 for (i = 0; i < efx->n_channels; i++) {
878 channel = efx->channel[i];
879 efx->channel[i] = other_channel[i];
880 other_channel[i] = channel;
881 }
882 goto out;
883 }
884
885 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
886 {
887 mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
888 }
889
890 static const struct efx_channel_type efx_default_channel_type = {
891 .pre_probe = efx_channel_dummy_op_int,
892 .post_remove = efx_channel_dummy_op_void,
893 .get_name = efx_get_channel_name,
894 .copy = efx_copy_channel,
895 .keep_eventq = false,
896 };
897
898 int efx_channel_dummy_op_int(struct efx_channel *channel)
899 {
900 return 0;
901 }
902
903 void efx_channel_dummy_op_void(struct efx_channel *channel)
904 {
905 }
906
907 /**************************************************************************
908 *
909 * Port handling
910 *
911 **************************************************************************/
912
913 /* This ensures that the kernel is kept informed (via
914 * netif_carrier_on/off) of the link status, and also maintains the
915 * link status's stop on the port's TX queue.
916 */
917 void efx_link_status_changed(struct efx_nic *efx)
918 {
919 struct efx_link_state *link_state = &efx->link_state;
920
921 /* SFC Bug 5356: A net_dev notifier is registered, so we must ensure
922 * that no events are triggered between unregister_netdev() and the
923 * driver unloading. A more general condition is that NETDEV_CHANGE
924 * can only be generated between NETDEV_UP and NETDEV_DOWN */
925 if (!netif_running(efx->net_dev))
926 return;
927
928 if (link_state->up != netif_carrier_ok(efx->net_dev)) {
929 efx->n_link_state_changes++;
930
931 if (link_state->up)
932 netif_carrier_on(efx->net_dev);
933 else
934 netif_carrier_off(efx->net_dev);
935 }
936
937 /* Status message for kernel log */
938 if (link_state->up)
939 netif_info(efx, link, efx->net_dev,
940 "link up at %uMbps %s-duplex (MTU %d)\n",
941 link_state->speed, link_state->fd ? "full" : "half",
942 efx->net_dev->mtu);
943 else
944 netif_info(efx, link, efx->net_dev, "link down\n");
945 }
946
947 void efx_link_set_advertising(struct efx_nic *efx, u32 advertising)
948 {
949 efx->link_advertising = advertising;
950 if (advertising) {
951 if (advertising & ADVERTISED_Pause)
952 efx->wanted_fc |= (EFX_FC_TX | EFX_FC_RX);
953 else
954 efx->wanted_fc &= ~(EFX_FC_TX | EFX_FC_RX);
955 if (advertising & ADVERTISED_Asym_Pause)
956 efx->wanted_fc ^= EFX_FC_TX;
957 }
958 }
959
960 void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
961 {
962 efx->wanted_fc = wanted_fc;
963 if (efx->link_advertising) {
964 if (wanted_fc & EFX_FC_RX)
965 efx->link_advertising |= (ADVERTISED_Pause |
966 ADVERTISED_Asym_Pause);
967 else
968 efx->link_advertising &= ~(ADVERTISED_Pause |
969 ADVERTISED_Asym_Pause);
970 if (wanted_fc & EFX_FC_TX)
971 efx->link_advertising ^= ADVERTISED_Asym_Pause;
972 }
973 }
974
975 static void efx_fini_port(struct efx_nic *efx);
976
977 /* We assume that efx->type->reconfigure_mac will always try to sync RX
978 * filters and therefore needs to read-lock the filter table against freeing
979 */
980 void efx_mac_reconfigure(struct efx_nic *efx)
981 {
982 down_read(&efx->filter_sem);
983 efx->type->reconfigure_mac(efx);
984 up_read(&efx->filter_sem);
985 }
986
987 /* Push loopback/power/transmit disable settings to the PHY, and reconfigure
988 * the MAC appropriately. All other PHY configuration changes are pushed
989 * through phy_op->set_settings(), and pushed asynchronously to the MAC
990 * through efx_monitor().
991 *
992 * Callers must hold the mac_lock
993 */
994 int __efx_reconfigure_port(struct efx_nic *efx)
995 {
996 enum efx_phy_mode phy_mode;
997 int rc;
998
999 WARN_ON(!mutex_is_locked(&efx->mac_lock));
1000
1001 /* Disable PHY transmit in mac level loopbacks */
1002 phy_mode = efx->phy_mode;
1003 if (LOOPBACK_INTERNAL(efx))
1004 efx->phy_mode |= PHY_MODE_TX_DISABLED;
1005 else
1006 efx->phy_mode &= ~PHY_MODE_TX_DISABLED;
1007
1008 rc = efx->type->reconfigure_port(efx);
1009
1010 if (rc)
1011 efx->phy_mode = phy_mode;
1012
1013 return rc;
1014 }
1015
1016 /* Reinitialise the MAC to pick up new PHY settings, even if the port is
1017 * disabled. */
1018 int efx_reconfigure_port(struct efx_nic *efx)
1019 {
1020 int rc;
1021
1022 EFX_ASSERT_RESET_SERIALISED(efx);
1023
1024 mutex_lock(&efx->mac_lock);
1025 rc = __efx_reconfigure_port(efx);
1026 mutex_unlock(&efx->mac_lock);
1027
1028 return rc;
1029 }
1030
1031 /* Asynchronous work item for changing MAC promiscuity and multicast
1032 * hash. Avoid a drain/rx_ingress enable by reconfiguring the current
1033 * MAC directly. */
1034 static void efx_mac_work(struct work_struct *data)
1035 {
1036 struct efx_nic *efx = container_of(data, struct efx_nic, mac_work);
1037
1038 mutex_lock(&efx->mac_lock);
1039 if (efx->port_enabled)
1040 efx_mac_reconfigure(efx);
1041 mutex_unlock(&efx->mac_lock);
1042 }
1043
1044 static int efx_probe_port(struct efx_nic *efx)
1045 {
1046 int rc;
1047
1048 netif_dbg(efx, probe, efx->net_dev, "create port\n");
1049
1050 if (phy_flash_cfg)
1051 efx->phy_mode = PHY_MODE_SPECIAL;
1052
1053 /* Connect up MAC/PHY operations table */
1054 rc = efx->type->probe_port(efx);
1055 if (rc)
1056 return rc;
1057
1058 /* Initialise MAC address to permanent address */
1059 ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
1060
1061 return 0;
1062 }
1063
1064 static int efx_init_port(struct efx_nic *efx)
1065 {
1066 int rc;
1067
1068 netif_dbg(efx, drv, efx->net_dev, "init port\n");
1069
1070 mutex_lock(&efx->mac_lock);
1071
1072 rc = efx->phy_op->init(efx);
1073 if (rc)
1074 goto fail1;
1075
1076 efx->port_initialized = true;
1077
1078 /* Reconfigure the MAC before creating dma queues (required for
1079 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
1080 efx_mac_reconfigure(efx);
1081
1082 /* Ensure the PHY advertises the correct flow control settings */
1083 rc = efx->phy_op->reconfigure(efx);
1084 if (rc && rc != -EPERM)
1085 goto fail2;
1086
1087 mutex_unlock(&efx->mac_lock);
1088 return 0;
1089
1090 fail2:
1091 efx->phy_op->fini(efx);
1092 fail1:
1093 mutex_unlock(&efx->mac_lock);
1094 return rc;
1095 }
1096
1097 static void efx_start_port(struct efx_nic *efx)
1098 {
1099 netif_dbg(efx, ifup, efx->net_dev, "start port\n");
1100 BUG_ON(efx->port_enabled);
1101
1102 mutex_lock(&efx->mac_lock);
1103 efx->port_enabled = true;
1104
1105 /* Ensure MAC ingress/egress is enabled */
1106 efx_mac_reconfigure(efx);
1107
1108 mutex_unlock(&efx->mac_lock);
1109 }
1110
1111 /* Cancel work for MAC reconfiguration, periodic hardware monitoring
1112 * and the async self-test, wait for them to finish and prevent them
1113 * being scheduled again. This doesn't cover online resets, which
1114 * should only be cancelled when removing the device.
1115 */
1116 static void efx_stop_port(struct efx_nic *efx)
1117 {
1118 netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1119
1120 EFX_ASSERT_RESET_SERIALISED(efx);
1121
1122 mutex_lock(&efx->mac_lock);
1123 efx->port_enabled = false;
1124 mutex_unlock(&efx->mac_lock);
1125
1126 /* Serialise against efx_set_multicast_list() */
1127 netif_addr_lock_bh(efx->net_dev);
1128 netif_addr_unlock_bh(efx->net_dev);
1129
1130 cancel_delayed_work_sync(&efx->monitor_work);
1131 efx_selftest_async_cancel(efx);
1132 cancel_work_sync(&efx->mac_work);
1133 }
1134
1135 static void efx_fini_port(struct efx_nic *efx)
1136 {
1137 netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1138
1139 if (!efx->port_initialized)
1140 return;
1141
1142 efx->phy_op->fini(efx);
1143 efx->port_initialized = false;
1144
1145 efx->link_state.up = false;
1146 efx_link_status_changed(efx);
1147 }
1148
1149 static void efx_remove_port(struct efx_nic *efx)
1150 {
1151 netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1152
1153 efx->type->remove_port(efx);
1154 }
1155
1156 /**************************************************************************
1157 *
1158 * NIC handling
1159 *
1160 **************************************************************************/
1161
1162 static LIST_HEAD(efx_primary_list);
1163 static LIST_HEAD(efx_unassociated_list);
1164
1165 static bool efx_same_controller(struct efx_nic *left, struct efx_nic *right)
1166 {
1167 return left->type == right->type &&
1168 left->vpd_sn && right->vpd_sn &&
1169 !strcmp(left->vpd_sn, right->vpd_sn);
1170 }
1171
1172 static void efx_associate(struct efx_nic *efx)
1173 {
1174 struct efx_nic *other, *next;
1175
1176 if (efx->primary == efx) {
1177 /* Adding primary function; look for secondaries */
1178
1179 netif_dbg(efx, probe, efx->net_dev, "adding to primary list\n");
1180 list_add_tail(&efx->node, &efx_primary_list);
1181
1182 list_for_each_entry_safe(other, next, &efx_unassociated_list,
1183 node) {
1184 if (efx_same_controller(efx, other)) {
1185 list_del(&other->node);
1186 netif_dbg(other, probe, other->net_dev,
1187 "moving to secondary list of %s %s\n",
1188 pci_name(efx->pci_dev),
1189 efx->net_dev->name);
1190 list_add_tail(&other->node,
1191 &efx->secondary_list);
1192 other->primary = efx;
1193 }
1194 }
1195 } else {
1196 /* Adding secondary function; look for primary */
1197
1198 list_for_each_entry(other, &efx_primary_list, node) {
1199 if (efx_same_controller(efx, other)) {
1200 netif_dbg(efx, probe, efx->net_dev,
1201 "adding to secondary list of %s %s\n",
1202 pci_name(other->pci_dev),
1203 other->net_dev->name);
1204 list_add_tail(&efx->node,
1205 &other->secondary_list);
1206 efx->primary = other;
1207 return;
1208 }
1209 }
1210
1211 netif_dbg(efx, probe, efx->net_dev,
1212 "adding to unassociated list\n");
1213 list_add_tail(&efx->node, &efx_unassociated_list);
1214 }
1215 }
1216
1217 static void efx_dissociate(struct efx_nic *efx)
1218 {
1219 struct efx_nic *other, *next;
1220
1221 list_del(&efx->node);
1222 efx->primary = NULL;
1223
1224 list_for_each_entry_safe(other, next, &efx->secondary_list, node) {
1225 list_del(&other->node);
1226 netif_dbg(other, probe, other->net_dev,
1227 "moving to unassociated list\n");
1228 list_add_tail(&other->node, &efx_unassociated_list);
1229 other->primary = NULL;
1230 }
1231 }
1232
1233 /* This configures the PCI device to enable I/O and DMA. */
1234 static int efx_init_io(struct efx_nic *efx)
1235 {
1236 struct pci_dev *pci_dev = efx->pci_dev;
1237 dma_addr_t dma_mask = efx->type->max_dma_mask;
1238 unsigned int mem_map_size = efx->type->mem_map_size(efx);
1239 int rc, bar;
1240
1241 netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1242
1243 bar = efx->type->mem_bar;
1244
1245 rc = pci_enable_device(pci_dev);
1246 if (rc) {
1247 netif_err(efx, probe, efx->net_dev,
1248 "failed to enable PCI device\n");
1249 goto fail1;
1250 }
1251
1252 pci_set_master(pci_dev);
1253
1254 /* Set the PCI DMA mask. Try all possibilities from our
1255 * genuine mask down to 32 bits, because some architectures
1256 * (e.g. x86_64 with iommu_sac_force set) will allow 40 bit
1257 * masks event though they reject 46 bit masks.
1258 */
1259 while (dma_mask > 0x7fffffffUL) {
1260 rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
1261 if (rc == 0)
1262 break;
1263 dma_mask >>= 1;
1264 }
1265 if (rc) {
1266 netif_err(efx, probe, efx->net_dev,
1267 "could not find a suitable DMA mask\n");
1268 goto fail2;
1269 }
1270 netif_dbg(efx, probe, efx->net_dev,
1271 "using DMA mask %llx\n", (unsigned long long) dma_mask);
1272
1273 efx->membase_phys = pci_resource_start(efx->pci_dev, bar);
1274 rc = pci_request_region(pci_dev, bar, "sfc");
1275 if (rc) {
1276 netif_err(efx, probe, efx->net_dev,
1277 "request for memory BAR failed\n");
1278 rc = -EIO;
1279 goto fail3;
1280 }
1281 efx->membase = ioremap_nocache(efx->membase_phys, mem_map_size);
1282 if (!efx->membase) {
1283 netif_err(efx, probe, efx->net_dev,
1284 "could not map memory BAR at %llx+%x\n",
1285 (unsigned long long)efx->membase_phys, mem_map_size);
1286 rc = -ENOMEM;
1287 goto fail4;
1288 }
1289 netif_dbg(efx, probe, efx->net_dev,
1290 "memory BAR at %llx+%x (virtual %p)\n",
1291 (unsigned long long)efx->membase_phys, mem_map_size,
1292 efx->membase);
1293
1294 return 0;
1295
1296 fail4:
1297 pci_release_region(efx->pci_dev, bar);
1298 fail3:
1299 efx->membase_phys = 0;
1300 fail2:
1301 pci_disable_device(efx->pci_dev);
1302 fail1:
1303 return rc;
1304 }
1305
1306 static void efx_fini_io(struct efx_nic *efx)
1307 {
1308 int bar;
1309
1310 netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1311
1312 if (efx->membase) {
1313 iounmap(efx->membase);
1314 efx->membase = NULL;
1315 }
1316
1317 if (efx->membase_phys) {
1318 bar = efx->type->mem_bar;
1319 pci_release_region(efx->pci_dev, bar);
1320 efx->membase_phys = 0;
1321 }
1322
1323 /* Don't disable bus-mastering if VFs are assigned */
1324 if (!pci_vfs_assigned(efx->pci_dev))
1325 pci_disable_device(efx->pci_dev);
1326 }
1327
1328 void efx_set_default_rx_indir_table(struct efx_nic *efx)
1329 {
1330 size_t i;
1331
1332 for (i = 0; i < ARRAY_SIZE(efx->rx_indir_table); i++)
1333 efx->rx_indir_table[i] =
1334 ethtool_rxfh_indir_default(i, efx->rss_spread);
1335 }
1336
1337 static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
1338 {
1339 cpumask_var_t thread_mask;
1340 unsigned int count;
1341 int cpu;
1342
1343 if (rss_cpus) {
1344 count = rss_cpus;
1345 } else {
1346 if (unlikely(!zalloc_cpumask_var(&thread_mask, GFP_KERNEL))) {
1347 netif_warn(efx, probe, efx->net_dev,
1348 "RSS disabled due to allocation failure\n");
1349 return 1;
1350 }
1351
1352 count = 0;
1353 for_each_online_cpu(cpu) {
1354 if (!cpumask_test_cpu(cpu, thread_mask)) {
1355 ++count;
1356 cpumask_or(thread_mask, thread_mask,
1357 topology_sibling_cpumask(cpu));
1358 }
1359 }
1360
1361 free_cpumask_var(thread_mask);
1362 }
1363
1364 /* If RSS is requested for the PF *and* VFs then we can't write RSS
1365 * table entries that are inaccessible to VFs
1366 */
1367 #ifdef CONFIG_SFC_SRIOV
1368 if (efx->type->sriov_wanted) {
1369 if (efx->type->sriov_wanted(efx) && efx_vf_size(efx) > 1 &&
1370 count > efx_vf_size(efx)) {
1371 netif_warn(efx, probe, efx->net_dev,
1372 "Reducing number of RSS channels from %u to %u for "
1373 "VF support. Increase vf-msix-limit to use more "
1374 "channels on the PF.\n",
1375 count, efx_vf_size(efx));
1376 count = efx_vf_size(efx);
1377 }
1378 }
1379 #endif
1380
1381 return count;
1382 }
1383
1384 /* Probe the number and type of interrupts we are able to obtain, and
1385 * the resulting numbers of channels and RX queues.
1386 */
1387 static int efx_probe_interrupts(struct efx_nic *efx)
1388 {
1389 unsigned int extra_channels = 0;
1390 unsigned int i, j;
1391 int rc;
1392
1393 for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++)
1394 if (efx->extra_channel_type[i])
1395 ++extra_channels;
1396
1397 if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1398 struct msix_entry xentries[EFX_MAX_CHANNELS];
1399 unsigned int n_channels;
1400
1401 n_channels = efx_wanted_parallelism(efx);
1402 if (efx_separate_tx_channels)
1403 n_channels *= 2;
1404 n_channels += extra_channels;
1405 n_channels = min(n_channels, efx->max_channels);
1406
1407 for (i = 0; i < n_channels; i++)
1408 xentries[i].entry = i;
1409 rc = pci_enable_msix_range(efx->pci_dev,
1410 xentries, 1, n_channels);
1411 if (rc < 0) {
1412 /* Fall back to single channel MSI */
1413 efx->interrupt_mode = EFX_INT_MODE_MSI;
1414 netif_err(efx, drv, efx->net_dev,
1415 "could not enable MSI-X\n");
1416 } else if (rc < n_channels) {
1417 netif_err(efx, drv, efx->net_dev,
1418 "WARNING: Insufficient MSI-X vectors"
1419 " available (%d < %u).\n", rc, n_channels);
1420 netif_err(efx, drv, efx->net_dev,
1421 "WARNING: Performance may be reduced.\n");
1422 n_channels = rc;
1423 }
1424
1425 if (rc > 0) {
1426 efx->n_channels = n_channels;
1427 if (n_channels > extra_channels)
1428 n_channels -= extra_channels;
1429 if (efx_separate_tx_channels) {
1430 efx->n_tx_channels = min(max(n_channels / 2,
1431 1U),
1432 efx->max_tx_channels);
1433 efx->n_rx_channels = max(n_channels -
1434 efx->n_tx_channels,
1435 1U);
1436 } else {
1437 efx->n_tx_channels = min(n_channels,
1438 efx->max_tx_channels);
1439 efx->n_rx_channels = n_channels;
1440 }
1441 for (i = 0; i < efx->n_channels; i++)
1442 efx_get_channel(efx, i)->irq =
1443 xentries[i].vector;
1444 }
1445 }
1446
1447 /* Try single interrupt MSI */
1448 if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1449 efx->n_channels = 1;
1450 efx->n_rx_channels = 1;
1451 efx->n_tx_channels = 1;
1452 rc = pci_enable_msi(efx->pci_dev);
1453 if (rc == 0) {
1454 efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1455 } else {
1456 netif_err(efx, drv, efx->net_dev,
1457 "could not enable MSI\n");
1458 efx->interrupt_mode = EFX_INT_MODE_LEGACY;
1459 }
1460 }
1461
1462 /* Assume legacy interrupts */
1463 if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1464 efx->n_channels = 1 + (efx_separate_tx_channels ? 1 : 0);
1465 efx->n_rx_channels = 1;
1466 efx->n_tx_channels = 1;
1467 efx->legacy_irq = efx->pci_dev->irq;
1468 }
1469
1470 /* Assign extra channels if possible */
1471 j = efx->n_channels;
1472 for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++) {
1473 if (!efx->extra_channel_type[i])
1474 continue;
1475 if (efx->interrupt_mode != EFX_INT_MODE_MSIX ||
1476 efx->n_channels <= extra_channels) {
1477 efx->extra_channel_type[i]->handle_no_channel(efx);
1478 } else {
1479 --j;
1480 efx_get_channel(efx, j)->type =
1481 efx->extra_channel_type[i];
1482 }
1483 }
1484
1485 /* RSS might be usable on VFs even if it is disabled on the PF */
1486 #ifdef CONFIG_SFC_SRIOV
1487 if (efx->type->sriov_wanted) {
1488 efx->rss_spread = ((efx->n_rx_channels > 1 ||
1489 !efx->type->sriov_wanted(efx)) ?
1490 efx->n_rx_channels : efx_vf_size(efx));
1491 return 0;
1492 }
1493 #endif
1494 efx->rss_spread = efx->n_rx_channels;
1495
1496 return 0;
1497 }
1498
1499 static int efx_soft_enable_interrupts(struct efx_nic *efx)
1500 {
1501 struct efx_channel *channel, *end_channel;
1502 int rc;
1503
1504 BUG_ON(efx->state == STATE_DISABLED);
1505
1506 efx->irq_soft_enabled = true;
1507 smp_wmb();
1508
1509 efx_for_each_channel(channel, efx) {
1510 if (!channel->type->keep_eventq) {
1511 rc = efx_init_eventq(channel);
1512 if (rc)
1513 goto fail;
1514 }
1515 efx_start_eventq(channel);
1516 }
1517
1518 efx_mcdi_mode_event(efx);
1519
1520 return 0;
1521 fail:
1522 end_channel = channel;
1523 efx_for_each_channel(channel, efx) {
1524 if (channel == end_channel)
1525 break;
1526 efx_stop_eventq(channel);
1527 if (!channel->type->keep_eventq)
1528 efx_fini_eventq(channel);
1529 }
1530
1531 return rc;
1532 }
1533
1534 static void efx_soft_disable_interrupts(struct efx_nic *efx)
1535 {
1536 struct efx_channel *channel;
1537
1538 if (efx->state == STATE_DISABLED)
1539 return;
1540
1541 efx_mcdi_mode_poll(efx);
1542
1543 efx->irq_soft_enabled = false;
1544 smp_wmb();
1545
1546 if (efx->legacy_irq)
1547 synchronize_irq(efx->legacy_irq);
1548
1549 efx_for_each_channel(channel, efx) {
1550 if (channel->irq)
1551 synchronize_irq(channel->irq);
1552
1553 efx_stop_eventq(channel);
1554 if (!channel->type->keep_eventq)
1555 efx_fini_eventq(channel);
1556 }
1557
1558 /* Flush the asynchronous MCDI request queue */
1559 efx_mcdi_flush_async(efx);
1560 }
1561
1562 static int efx_enable_interrupts(struct efx_nic *efx)
1563 {
1564 struct efx_channel *channel, *end_channel;
1565 int rc;
1566
1567 BUG_ON(efx->state == STATE_DISABLED);
1568
1569 if (efx->eeh_disabled_legacy_irq) {
1570 enable_irq(efx->legacy_irq);
1571 efx->eeh_disabled_legacy_irq = false;
1572 }
1573
1574 efx->type->irq_enable_master(efx);
1575
1576 efx_for_each_channel(channel, efx) {
1577 if (channel->type->keep_eventq) {
1578 rc = efx_init_eventq(channel);
1579 if (rc)
1580 goto fail;
1581 }
1582 }
1583
1584 rc = efx_soft_enable_interrupts(efx);
1585 if (rc)
1586 goto fail;
1587
1588 return 0;
1589
1590 fail:
1591 end_channel = channel;
1592 efx_for_each_channel(channel, efx) {
1593 if (channel == end_channel)
1594 break;
1595 if (channel->type->keep_eventq)
1596 efx_fini_eventq(channel);
1597 }
1598
1599 efx->type->irq_disable_non_ev(efx);
1600
1601 return rc;
1602 }
1603
1604 static void efx_disable_interrupts(struct efx_nic *efx)
1605 {
1606 struct efx_channel *channel;
1607
1608 efx_soft_disable_interrupts(efx);
1609
1610 efx_for_each_channel(channel, efx) {
1611 if (channel->type->keep_eventq)
1612 efx_fini_eventq(channel);
1613 }
1614
1615 efx->type->irq_disable_non_ev(efx);
1616 }
1617
1618 static void efx_remove_interrupts(struct efx_nic *efx)
1619 {
1620 struct efx_channel *channel;
1621
1622 /* Remove MSI/MSI-X interrupts */
1623 efx_for_each_channel(channel, efx)
1624 channel->irq = 0;
1625 pci_disable_msi(efx->pci_dev);
1626 pci_disable_msix(efx->pci_dev);
1627
1628 /* Remove legacy interrupt */
1629 efx->legacy_irq = 0;
1630 }
1631
1632 static void efx_set_channels(struct efx_nic *efx)
1633 {
1634 struct efx_channel *channel;
1635 struct efx_tx_queue *tx_queue;
1636
1637 efx->tx_channel_offset =
1638 efx_separate_tx_channels ?
1639 efx->n_channels - efx->n_tx_channels : 0;
1640
1641 /* We need to mark which channels really have RX and TX
1642 * queues, and adjust the TX queue numbers if we have separate
1643 * RX-only and TX-only channels.
1644 */
1645 efx_for_each_channel(channel, efx) {
1646 if (channel->channel < efx->n_rx_channels)
1647 channel->rx_queue.core_index = channel->channel;
1648 else
1649 channel->rx_queue.core_index = -1;
1650
1651 efx_for_each_channel_tx_queue(tx_queue, channel)
1652 tx_queue->queue -= (efx->tx_channel_offset *
1653 EFX_TXQ_TYPES);
1654 }
1655 }
1656
1657 static int efx_probe_nic(struct efx_nic *efx)
1658 {
1659 int rc;
1660
1661 netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1662
1663 /* Carry out hardware-type specific initialisation */
1664 rc = efx->type->probe(efx);
1665 if (rc)
1666 return rc;
1667
1668 do {
1669 if (!efx->max_channels || !efx->max_tx_channels) {
1670 netif_err(efx, drv, efx->net_dev,
1671 "Insufficient resources to allocate"
1672 " any channels\n");
1673 rc = -ENOSPC;
1674 goto fail1;
1675 }
1676
1677 /* Determine the number of channels and queues by trying
1678 * to hook in MSI-X interrupts.
1679 */
1680 rc = efx_probe_interrupts(efx);
1681 if (rc)
1682 goto fail1;
1683
1684 efx_set_channels(efx);
1685
1686 /* dimension_resources can fail with EAGAIN */
1687 rc = efx->type->dimension_resources(efx);
1688 if (rc != 0 && rc != -EAGAIN)
1689 goto fail2;
1690
1691 if (rc == -EAGAIN)
1692 /* try again with new max_channels */
1693 efx_remove_interrupts(efx);
1694
1695 } while (rc == -EAGAIN);
1696
1697 if (efx->n_channels > 1)
1698 netdev_rss_key_fill(&efx->rx_hash_key,
1699 sizeof(efx->rx_hash_key));
1700 efx_set_default_rx_indir_table(efx);
1701
1702 netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels);
1703 netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels);
1704
1705 /* Initialise the interrupt moderation settings */
1706 efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
1707 true);
1708
1709 return 0;
1710
1711 fail2:
1712 efx_remove_interrupts(efx);
1713 fail1:
1714 efx->type->remove(efx);
1715 return rc;
1716 }
1717
1718 static void efx_remove_nic(struct efx_nic *efx)
1719 {
1720 netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1721
1722 efx_remove_interrupts(efx);
1723 efx->type->remove(efx);
1724 }
1725
1726 static int efx_probe_filters(struct efx_nic *efx)
1727 {
1728 int rc;
1729
1730 spin_lock_init(&efx->filter_lock);
1731 init_rwsem(&efx->filter_sem);
1732 down_write(&efx->filter_sem);
1733 rc = efx->type->filter_table_probe(efx);
1734 if (rc)
1735 goto out_unlock;
1736
1737 #ifdef CONFIG_RFS_ACCEL
1738 if (efx->type->offload_features & NETIF_F_NTUPLE) {
1739 struct efx_channel *channel;
1740 int i, success = 1;
1741
1742 efx_for_each_channel(channel, efx) {
1743 channel->rps_flow_id =
1744 kcalloc(efx->type->max_rx_ip_filters,
1745 sizeof(*channel->rps_flow_id),
1746 GFP_KERNEL);
1747 if (!channel->rps_flow_id)
1748 success = 0;
1749 else
1750 for (i = 0;
1751 i < efx->type->max_rx_ip_filters;
1752 ++i)
1753 channel->rps_flow_id[i] =
1754 RPS_FLOW_ID_INVALID;
1755 }
1756
1757 if (!success) {
1758 efx_for_each_channel(channel, efx)
1759 kfree(channel->rps_flow_id);
1760 efx->type->filter_table_remove(efx);
1761 rc = -ENOMEM;
1762 goto out_unlock;
1763 }
1764
1765 efx->rps_expire_index = efx->rps_expire_channel = 0;
1766 }
1767 #endif
1768 out_unlock:
1769 up_write(&efx->filter_sem);
1770 return rc;
1771 }
1772
1773 static void efx_remove_filters(struct efx_nic *efx)
1774 {
1775 #ifdef CONFIG_RFS_ACCEL
1776 struct efx_channel *channel;
1777
1778 efx_for_each_channel(channel, efx)
1779 kfree(channel->rps_flow_id);
1780 #endif
1781 down_write(&efx->filter_sem);
1782 efx->type->filter_table_remove(efx);
1783 up_write(&efx->filter_sem);
1784 }
1785
1786 static void efx_restore_filters(struct efx_nic *efx)
1787 {
1788 down_read(&efx->filter_sem);
1789 efx->type->filter_table_restore(efx);
1790 up_read(&efx->filter_sem);
1791 }
1792
1793 /**************************************************************************
1794 *
1795 * NIC startup/shutdown
1796 *
1797 *************************************************************************/
1798
1799 static int efx_probe_all(struct efx_nic *efx)
1800 {
1801 int rc;
1802
1803 rc = efx_probe_nic(efx);
1804 if (rc) {
1805 netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1806 goto fail1;
1807 }
1808
1809 rc = efx_probe_port(efx);
1810 if (rc) {
1811 netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1812 goto fail2;
1813 }
1814
1815 BUILD_BUG_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_RXQ_MIN_ENT);
1816 if (WARN_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_TXQ_MIN_ENT(efx))) {
1817 rc = -EINVAL;
1818 goto fail3;
1819 }
1820 efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1821
1822 #ifdef CONFIG_SFC_SRIOV
1823 rc = efx->type->vswitching_probe(efx);
1824 if (rc) /* not fatal; the PF will still work fine */
1825 netif_warn(efx, probe, efx->net_dev,
1826 "failed to setup vswitching rc=%d;"
1827 " VFs may not function\n", rc);
1828 #endif
1829
1830 rc = efx_probe_filters(efx);
1831 if (rc) {
1832 netif_err(efx, probe, efx->net_dev,
1833 "failed to create filter tables\n");
1834 goto fail4;
1835 }
1836
1837 rc = efx_probe_channels(efx);
1838 if (rc)
1839 goto fail5;
1840
1841 return 0;
1842
1843 fail5:
1844 efx_remove_filters(efx);
1845 fail4:
1846 #ifdef CONFIG_SFC_SRIOV
1847 efx->type->vswitching_remove(efx);
1848 #endif
1849 fail3:
1850 efx_remove_port(efx);
1851 fail2:
1852 efx_remove_nic(efx);
1853 fail1:
1854 return rc;
1855 }
1856
1857 /* If the interface is supposed to be running but is not, start
1858 * the hardware and software data path, regular activity for the port
1859 * (MAC statistics, link polling, etc.) and schedule the port to be
1860 * reconfigured. Interrupts must already be enabled. This function
1861 * is safe to call multiple times, so long as the NIC is not disabled.
1862 * Requires the RTNL lock.
1863 */
1864 static void efx_start_all(struct efx_nic *efx)
1865 {
1866 EFX_ASSERT_RESET_SERIALISED(efx);
1867 BUG_ON(efx->state == STATE_DISABLED);
1868
1869 /* Check that it is appropriate to restart the interface. All
1870 * of these flags are safe to read under just the rtnl lock */
1871 if (efx->port_enabled || !netif_running(efx->net_dev) ||
1872 efx->reset_pending)
1873 return;
1874
1875 efx_start_port(efx);
1876 efx_start_datapath(efx);
1877
1878 /* Start the hardware monitor if there is one */
1879 if (efx->type->monitor != NULL)
1880 queue_delayed_work(efx->workqueue, &efx->monitor_work,
1881 efx_monitor_interval);
1882
1883 /* If link state detection is normally event-driven, we have
1884 * to poll now because we could have missed a change
1885 */
1886 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0) {
1887 mutex_lock(&efx->mac_lock);
1888 if (efx->phy_op->poll(efx))
1889 efx_link_status_changed(efx);
1890 mutex_unlock(&efx->mac_lock);
1891 }
1892
1893 efx->type->start_stats(efx);
1894 efx->type->pull_stats(efx);
1895 spin_lock_bh(&efx->stats_lock);
1896 efx->type->update_stats(efx, NULL, NULL);
1897 spin_unlock_bh(&efx->stats_lock);
1898 }
1899
1900 /* Quiesce the hardware and software data path, and regular activity
1901 * for the port without bringing the link down. Safe to call multiple
1902 * times with the NIC in almost any state, but interrupts should be
1903 * enabled. Requires the RTNL lock.
1904 */
1905 static void efx_stop_all(struct efx_nic *efx)
1906 {
1907 EFX_ASSERT_RESET_SERIALISED(efx);
1908
1909 /* port_enabled can be read safely under the rtnl lock */
1910 if (!efx->port_enabled)
1911 return;
1912
1913 /* update stats before we go down so we can accurately count
1914 * rx_nodesc_drops
1915 */
1916 efx->type->pull_stats(efx);
1917 spin_lock_bh(&efx->stats_lock);
1918 efx->type->update_stats(efx, NULL, NULL);
1919 spin_unlock_bh(&efx->stats_lock);
1920 efx->type->stop_stats(efx);
1921 efx_stop_port(efx);
1922
1923 /* Stop the kernel transmit interface. This is only valid if
1924 * the device is stopped or detached; otherwise the watchdog
1925 * may fire immediately.
1926 */
1927 WARN_ON(netif_running(efx->net_dev) &&
1928 netif_device_present(efx->net_dev));
1929 netif_tx_disable(efx->net_dev);
1930
1931 efx_stop_datapath(efx);
1932 }
1933
1934 static void efx_remove_all(struct efx_nic *efx)
1935 {
1936 efx_remove_channels(efx);
1937 efx_remove_filters(efx);
1938 #ifdef CONFIG_SFC_SRIOV
1939 efx->type->vswitching_remove(efx);
1940 #endif
1941 efx_remove_port(efx);
1942 efx_remove_nic(efx);
1943 }
1944
1945 /**************************************************************************
1946 *
1947 * Interrupt moderation
1948 *
1949 **************************************************************************/
1950
1951 static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int quantum_ns)
1952 {
1953 if (usecs == 0)
1954 return 0;
1955 if (usecs * 1000 < quantum_ns)
1956 return 1; /* never round down to 0 */
1957 return usecs * 1000 / quantum_ns;
1958 }
1959
1960 /* Set interrupt moderation parameters */
1961 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
1962 unsigned int rx_usecs, bool rx_adaptive,
1963 bool rx_may_override_tx)
1964 {
1965 struct efx_channel *channel;
1966 unsigned int irq_mod_max = DIV_ROUND_UP(efx->type->timer_period_max *
1967 efx->timer_quantum_ns,
1968 1000);
1969 unsigned int tx_ticks;
1970 unsigned int rx_ticks;
1971
1972 EFX_ASSERT_RESET_SERIALISED(efx);
1973
1974 if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
1975 return -EINVAL;
1976
1977 tx_ticks = irq_mod_ticks(tx_usecs, efx->timer_quantum_ns);
1978 rx_ticks = irq_mod_ticks(rx_usecs, efx->timer_quantum_ns);
1979
1980 if (tx_ticks != rx_ticks && efx->tx_channel_offset == 0 &&
1981 !rx_may_override_tx) {
1982 netif_err(efx, drv, efx->net_dev, "Channels are shared. "
1983 "RX and TX IRQ moderation must be equal\n");
1984 return -EINVAL;
1985 }
1986
1987 efx->irq_rx_adaptive = rx_adaptive;
1988 efx->irq_rx_moderation = rx_ticks;
1989 efx_for_each_channel(channel, efx) {
1990 if (efx_channel_has_rx_queue(channel))
1991 channel->irq_moderation = rx_ticks;
1992 else if (efx_channel_has_tx_queues(channel))
1993 channel->irq_moderation = tx_ticks;
1994 }
1995
1996 return 0;
1997 }
1998
1999 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
2000 unsigned int *rx_usecs, bool *rx_adaptive)
2001 {
2002 /* We must round up when converting ticks to microseconds
2003 * because we round down when converting the other way.
2004 */
2005
2006 *rx_adaptive = efx->irq_rx_adaptive;
2007 *rx_usecs = DIV_ROUND_UP(efx->irq_rx_moderation *
2008 efx->timer_quantum_ns,
2009 1000);
2010
2011 /* If channels are shared between RX and TX, so is IRQ
2012 * moderation. Otherwise, IRQ moderation is the same for all
2013 * TX channels and is not adaptive.
2014 */
2015 if (efx->tx_channel_offset == 0)
2016 *tx_usecs = *rx_usecs;
2017 else
2018 *tx_usecs = DIV_ROUND_UP(
2019 efx->channel[efx->tx_channel_offset]->irq_moderation *
2020 efx->timer_quantum_ns,
2021 1000);
2022 }
2023
2024 /**************************************************************************
2025 *
2026 * Hardware monitor
2027 *
2028 **************************************************************************/
2029
2030 /* Run periodically off the general workqueue */
2031 static void efx_monitor(struct work_struct *data)
2032 {
2033 struct efx_nic *efx = container_of(data, struct efx_nic,
2034 monitor_work.work);
2035
2036 netif_vdbg(efx, timer, efx->net_dev,
2037 "hardware monitor executing on CPU %d\n",
2038 raw_smp_processor_id());
2039 BUG_ON(efx->type->monitor == NULL);
2040
2041 /* If the mac_lock is already held then it is likely a port
2042 * reconfiguration is already in place, which will likely do
2043 * most of the work of monitor() anyway. */
2044 if (mutex_trylock(&efx->mac_lock)) {
2045 if (efx->port_enabled)
2046 efx->type->monitor(efx);
2047 mutex_unlock(&efx->mac_lock);
2048 }
2049
2050 queue_delayed_work(efx->workqueue, &efx->monitor_work,
2051 efx_monitor_interval);
2052 }
2053
2054 /**************************************************************************
2055 *
2056 * ioctls
2057 *
2058 *************************************************************************/
2059
2060 /* Net device ioctl
2061 * Context: process, rtnl_lock() held.
2062 */
2063 static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
2064 {
2065 struct efx_nic *efx = netdev_priv(net_dev);
2066 struct mii_ioctl_data *data = if_mii(ifr);
2067
2068 if (cmd == SIOCSHWTSTAMP)
2069 return efx_ptp_set_ts_config(efx, ifr);
2070 if (cmd == SIOCGHWTSTAMP)
2071 return efx_ptp_get_ts_config(efx, ifr);
2072
2073 /* Convert phy_id from older PRTAD/DEVAD format */
2074 if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) &&
2075 (data->phy_id & 0xfc00) == 0x0400)
2076 data->phy_id ^= MDIO_PHY_ID_C45 | 0x0400;
2077
2078 return mdio_mii_ioctl(&efx->mdio, data, cmd);
2079 }
2080
2081 /**************************************************************************
2082 *
2083 * NAPI interface
2084 *
2085 **************************************************************************/
2086
2087 static void efx_init_napi_channel(struct efx_channel *channel)
2088 {
2089 struct efx_nic *efx = channel->efx;
2090
2091 channel->napi_dev = efx->net_dev;
2092 netif_napi_add(channel->napi_dev, &channel->napi_str,
2093 efx_poll, napi_weight);
2094 efx_channel_busy_poll_init(channel);
2095 }
2096
2097 static void efx_init_napi(struct efx_nic *efx)
2098 {
2099 struct efx_channel *channel;
2100
2101 efx_for_each_channel(channel, efx)
2102 efx_init_napi_channel(channel);
2103 }
2104
2105 static void efx_fini_napi_channel(struct efx_channel *channel)
2106 {
2107 if (channel->napi_dev) {
2108 netif_napi_del(&channel->napi_str);
2109 napi_hash_del(&channel->napi_str);
2110 }
2111 channel->napi_dev = NULL;
2112 }
2113
2114 static void efx_fini_napi(struct efx_nic *efx)
2115 {
2116 struct efx_channel *channel;
2117
2118 efx_for_each_channel(channel, efx)
2119 efx_fini_napi_channel(channel);
2120 }
2121
2122 /**************************************************************************
2123 *
2124 * Kernel netpoll interface
2125 *
2126 *************************************************************************/
2127
2128 #ifdef CONFIG_NET_POLL_CONTROLLER
2129
2130 /* Although in the common case interrupts will be disabled, this is not
2131 * guaranteed. However, all our work happens inside the NAPI callback,
2132 * so no locking is required.
2133 */
2134 static void efx_netpoll(struct net_device *net_dev)
2135 {
2136 struct efx_nic *efx = netdev_priv(net_dev);
2137 struct efx_channel *channel;
2138
2139 efx_for_each_channel(channel, efx)
2140 efx_schedule_channel(channel);
2141 }
2142
2143 #endif
2144
2145 #ifdef CONFIG_NET_RX_BUSY_POLL
2146 static int efx_busy_poll(struct napi_struct *napi)
2147 {
2148 struct efx_channel *channel =
2149 container_of(napi, struct efx_channel, napi_str);
2150 struct efx_nic *efx = channel->efx;
2151 int budget = 4;
2152 int old_rx_packets, rx_packets;
2153
2154 if (!netif_running(efx->net_dev))
2155 return LL_FLUSH_FAILED;
2156
2157 if (!efx_channel_try_lock_poll(channel))
2158 return LL_FLUSH_BUSY;
2159
2160 old_rx_packets = channel->rx_queue.rx_packets;
2161 efx_process_channel(channel, budget);
2162
2163 rx_packets = channel->rx_queue.rx_packets - old_rx_packets;
2164
2165 /* There is no race condition with NAPI here.
2166 * NAPI will automatically be rescheduled if it yielded during busy
2167 * polling, because it was not able to take the lock and thus returned
2168 * the full budget.
2169 */
2170 efx_channel_unlock_poll(channel);
2171
2172 return rx_packets;
2173 }
2174 #endif
2175
2176 /**************************************************************************
2177 *
2178 * Kernel net device interface
2179 *
2180 *************************************************************************/
2181
2182 /* Context: process, rtnl_lock() held. */
2183 int efx_net_open(struct net_device *net_dev)
2184 {
2185 struct efx_nic *efx = netdev_priv(net_dev);
2186 int rc;
2187
2188 netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
2189 raw_smp_processor_id());
2190
2191 rc = efx_check_disabled(efx);
2192 if (rc)
2193 return rc;
2194 if (efx->phy_mode & PHY_MODE_SPECIAL)
2195 return -EBUSY;
2196 if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
2197 return -EIO;
2198
2199 /* Notify the kernel of the link state polled during driver load,
2200 * before the monitor starts running */
2201 efx_link_status_changed(efx);
2202
2203 efx_start_all(efx);
2204 efx_selftest_async_start(efx);
2205 return 0;
2206 }
2207
2208 /* Context: process, rtnl_lock() held.
2209 * Note that the kernel will ignore our return code; this method
2210 * should really be a void.
2211 */
2212 int efx_net_stop(struct net_device *net_dev)
2213 {
2214 struct efx_nic *efx = netdev_priv(net_dev);
2215
2216 netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
2217 raw_smp_processor_id());
2218
2219 /* Stop the device and flush all the channels */
2220 efx_stop_all(efx);
2221
2222 return 0;
2223 }
2224
2225 /* Context: process, dev_base_lock or RTNL held, non-blocking. */
2226 static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev,
2227 struct rtnl_link_stats64 *stats)
2228 {
2229 struct efx_nic *efx = netdev_priv(net_dev);
2230
2231 spin_lock_bh(&efx->stats_lock);
2232 efx->type->update_stats(efx, NULL, stats);
2233 spin_unlock_bh(&efx->stats_lock);
2234
2235 return stats;
2236 }
2237
2238 /* Context: netif_tx_lock held, BHs disabled. */
2239 static void efx_watchdog(struct net_device *net_dev)
2240 {
2241 struct efx_nic *efx = netdev_priv(net_dev);
2242
2243 netif_err(efx, tx_err, efx->net_dev,
2244 "TX stuck with port_enabled=%d: resetting channels\n",
2245 efx->port_enabled);
2246
2247 efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
2248 }
2249
2250
2251 /* Context: process, rtnl_lock() held. */
2252 static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
2253 {
2254 struct efx_nic *efx = netdev_priv(net_dev);
2255 int rc;
2256
2257 rc = efx_check_disabled(efx);
2258 if (rc)
2259 return rc;
2260 if (new_mtu > EFX_MAX_MTU)
2261 return -EINVAL;
2262
2263 netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
2264
2265 efx_device_detach_sync(efx);
2266 efx_stop_all(efx);
2267
2268 mutex_lock(&efx->mac_lock);
2269 net_dev->mtu = new_mtu;
2270 efx_mac_reconfigure(efx);
2271 mutex_unlock(&efx->mac_lock);
2272
2273 efx_start_all(efx);
2274 netif_device_attach(efx->net_dev);
2275 return 0;
2276 }
2277
2278 static int efx_set_mac_address(struct net_device *net_dev, void *data)
2279 {
2280 struct efx_nic *efx = netdev_priv(net_dev);
2281 struct sockaddr *addr = data;
2282 u8 *new_addr = addr->sa_data;
2283 u8 old_addr[6];
2284 int rc;
2285
2286 if (!is_valid_ether_addr(new_addr)) {
2287 netif_err(efx, drv, efx->net_dev,
2288 "invalid ethernet MAC address requested: %pM\n",
2289 new_addr);
2290 return -EADDRNOTAVAIL;
2291 }
2292
2293 /* save old address */
2294 ether_addr_copy(old_addr, net_dev->dev_addr);
2295 ether_addr_copy(net_dev->dev_addr, new_addr);
2296 if (efx->type->set_mac_address) {
2297 rc = efx->type->set_mac_address(efx);
2298 if (rc) {
2299 ether_addr_copy(net_dev->dev_addr, old_addr);
2300 return rc;
2301 }
2302 }
2303
2304 /* Reconfigure the MAC */
2305 mutex_lock(&efx->mac_lock);
2306 efx_mac_reconfigure(efx);
2307 mutex_unlock(&efx->mac_lock);
2308
2309 return 0;
2310 }
2311
2312 /* Context: netif_addr_lock held, BHs disabled. */
2313 static void efx_set_rx_mode(struct net_device *net_dev)
2314 {
2315 struct efx_nic *efx = netdev_priv(net_dev);
2316
2317 if (efx->port_enabled)
2318 queue_work(efx->workqueue, &efx->mac_work);
2319 /* Otherwise efx_start_port() will do this */
2320 }
2321
2322 static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
2323 {
2324 struct efx_nic *efx = netdev_priv(net_dev);
2325
2326 /* If disabling RX n-tuple filtering, clear existing filters */
2327 if (net_dev->features & ~data & NETIF_F_NTUPLE)
2328 return efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
2329
2330 return 0;
2331 }
2332
2333 static const struct net_device_ops efx_netdev_ops = {
2334 .ndo_open = efx_net_open,
2335 .ndo_stop = efx_net_stop,
2336 .ndo_get_stats64 = efx_net_stats,
2337 .ndo_tx_timeout = efx_watchdog,
2338 .ndo_start_xmit = efx_hard_start_xmit,
2339 .ndo_validate_addr = eth_validate_addr,
2340 .ndo_do_ioctl = efx_ioctl,
2341 .ndo_change_mtu = efx_change_mtu,
2342 .ndo_set_mac_address = efx_set_mac_address,
2343 .ndo_set_rx_mode = efx_set_rx_mode,
2344 .ndo_set_features = efx_set_features,
2345 #ifdef CONFIG_SFC_SRIOV
2346 .ndo_set_vf_mac = efx_sriov_set_vf_mac,
2347 .ndo_set_vf_vlan = efx_sriov_set_vf_vlan,
2348 .ndo_set_vf_spoofchk = efx_sriov_set_vf_spoofchk,
2349 .ndo_get_vf_config = efx_sriov_get_vf_config,
2350 .ndo_set_vf_link_state = efx_sriov_set_vf_link_state,
2351 .ndo_get_phys_port_id = efx_sriov_get_phys_port_id,
2352 #endif
2353 #ifdef CONFIG_NET_POLL_CONTROLLER
2354 .ndo_poll_controller = efx_netpoll,
2355 #endif
2356 .ndo_setup_tc = efx_setup_tc,
2357 #ifdef CONFIG_NET_RX_BUSY_POLL
2358 .ndo_busy_poll = efx_busy_poll,
2359 #endif
2360 #ifdef CONFIG_RFS_ACCEL
2361 .ndo_rx_flow_steer = efx_filter_rfs,
2362 #endif
2363 };
2364
2365 static void efx_update_name(struct efx_nic *efx)
2366 {
2367 strcpy(efx->name, efx->net_dev->name);
2368 efx_mtd_rename(efx);
2369 efx_set_channel_names(efx);
2370 }
2371
2372 static int efx_netdev_event(struct notifier_block *this,
2373 unsigned long event, void *ptr)
2374 {
2375 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
2376
2377 if ((net_dev->netdev_ops == &efx_netdev_ops) &&
2378 event == NETDEV_CHANGENAME)
2379 efx_update_name(netdev_priv(net_dev));
2380
2381 return NOTIFY_DONE;
2382 }
2383
2384 static struct notifier_block efx_netdev_notifier = {
2385 .notifier_call = efx_netdev_event,
2386 };
2387
2388 static ssize_t
2389 show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
2390 {
2391 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
2392 return sprintf(buf, "%d\n", efx->phy_type);
2393 }
2394 static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
2395
2396 #ifdef CONFIG_SFC_MCDI_LOGGING
2397 static ssize_t show_mcdi_log(struct device *dev, struct device_attribute *attr,
2398 char *buf)
2399 {
2400 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
2401 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
2402
2403 return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
2404 }
2405 static ssize_t set_mcdi_log(struct device *dev, struct device_attribute *attr,
2406 const char *buf, size_t count)
2407 {
2408 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
2409 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
2410 bool enable = count > 0 && *buf != '0';
2411
2412 mcdi->logging_enabled = enable;
2413 return count;
2414 }
2415 static DEVICE_ATTR(mcdi_logging, 0644, show_mcdi_log, set_mcdi_log);
2416 #endif
2417
2418 static int efx_register_netdev(struct efx_nic *efx)
2419 {
2420 struct net_device *net_dev = efx->net_dev;
2421 struct efx_channel *channel;
2422 int rc;
2423
2424 net_dev->watchdog_timeo = 5 * HZ;
2425 net_dev->irq = efx->pci_dev->irq;
2426 net_dev->netdev_ops = &efx_netdev_ops;
2427 if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
2428 net_dev->priv_flags |= IFF_UNICAST_FLT;
2429 net_dev->ethtool_ops = &efx_ethtool_ops;
2430 net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
2431
2432 rtnl_lock();
2433
2434 /* Enable resets to be scheduled and check whether any were
2435 * already requested. If so, the NIC is probably hosed so we
2436 * abort.
2437 */
2438 efx->state = STATE_READY;
2439 smp_mb(); /* ensure we change state before checking reset_pending */
2440 if (efx->reset_pending) {
2441 netif_err(efx, probe, efx->net_dev,
2442 "aborting probe due to scheduled reset\n");
2443 rc = -EIO;
2444 goto fail_locked;
2445 }
2446
2447 rc = dev_alloc_name(net_dev, net_dev->name);
2448 if (rc < 0)
2449 goto fail_locked;
2450 efx_update_name(efx);
2451
2452 /* Always start with carrier off; PHY events will detect the link */
2453 netif_carrier_off(net_dev);
2454
2455 rc = register_netdevice(net_dev);
2456 if (rc)
2457 goto fail_locked;
2458
2459 efx_for_each_channel(channel, efx) {
2460 struct efx_tx_queue *tx_queue;
2461 efx_for_each_channel_tx_queue(tx_queue, channel)
2462 efx_init_tx_queue_core_txq(tx_queue);
2463 }
2464
2465 efx_associate(efx);
2466
2467 rtnl_unlock();
2468
2469 rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
2470 if (rc) {
2471 netif_err(efx, drv, efx->net_dev,
2472 "failed to init net dev attributes\n");
2473 goto fail_registered;
2474 }
2475 #ifdef CONFIG_SFC_MCDI_LOGGING
2476 rc = device_create_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
2477 if (rc) {
2478 netif_err(efx, drv, efx->net_dev,
2479 "failed to init net dev attributes\n");
2480 goto fail_attr_mcdi_logging;
2481 }
2482 #endif
2483
2484 return 0;
2485
2486 #ifdef CONFIG_SFC_MCDI_LOGGING
2487 fail_attr_mcdi_logging:
2488 device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
2489 #endif
2490 fail_registered:
2491 rtnl_lock();
2492 efx_dissociate(efx);
2493 unregister_netdevice(net_dev);
2494 fail_locked:
2495 efx->state = STATE_UNINIT;
2496 rtnl_unlock();
2497 netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2498 return rc;
2499 }
2500
2501 static void efx_unregister_netdev(struct efx_nic *efx)
2502 {
2503 if (!efx->net_dev)
2504 return;
2505
2506 BUG_ON(netdev_priv(efx->net_dev) != efx);
2507
2508 if (efx_dev_registered(efx)) {
2509 strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
2510 #ifdef CONFIG_SFC_MCDI_LOGGING
2511 device_remove_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
2512 #endif
2513 device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
2514 unregister_netdev(efx->net_dev);
2515 }
2516 }
2517
2518 /**************************************************************************
2519 *
2520 * Device reset and suspend
2521 *
2522 **************************************************************************/
2523
2524 /* Tears down the entire software state and most of the hardware state
2525 * before reset. */
2526 void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2527 {
2528 EFX_ASSERT_RESET_SERIALISED(efx);
2529
2530 if (method == RESET_TYPE_MCDI_TIMEOUT)
2531 efx->type->prepare_flr(efx);
2532
2533 efx_stop_all(efx);
2534 efx_disable_interrupts(efx);
2535
2536 mutex_lock(&efx->mac_lock);
2537 if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
2538 method != RESET_TYPE_DATAPATH)
2539 efx->phy_op->fini(efx);
2540 efx->type->fini(efx);
2541 }
2542
2543 /* This function will always ensure that the locks acquired in
2544 * efx_reset_down() are released. A failure return code indicates
2545 * that we were unable to reinitialise the hardware, and the
2546 * driver should be disabled. If ok is false, then the rx and tx
2547 * engines are not restarted, pending a RESET_DISABLE. */
2548 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2549 {
2550 int rc;
2551
2552 EFX_ASSERT_RESET_SERIALISED(efx);
2553
2554 if (method == RESET_TYPE_MCDI_TIMEOUT)
2555 efx->type->finish_flr(efx);
2556
2557 /* Ensure that SRAM is initialised even if we're disabling the device */
2558 rc = efx->type->init(efx);
2559 if (rc) {
2560 netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2561 goto fail;
2562 }
2563
2564 if (!ok)
2565 goto fail;
2566
2567 if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
2568 method != RESET_TYPE_DATAPATH) {
2569 rc = efx->phy_op->init(efx);
2570 if (rc)
2571 goto fail;
2572 rc = efx->phy_op->reconfigure(efx);
2573 if (rc && rc != -EPERM)
2574 netif_err(efx, drv, efx->net_dev,
2575 "could not restore PHY settings\n");
2576 }
2577
2578 rc = efx_enable_interrupts(efx);
2579 if (rc)
2580 goto fail;
2581
2582 #ifdef CONFIG_SFC_SRIOV
2583 rc = efx->type->vswitching_restore(efx);
2584 if (rc) /* not fatal; the PF will still work fine */
2585 netif_warn(efx, probe, efx->net_dev,
2586 "failed to restore vswitching rc=%d;"
2587 " VFs may not function\n", rc);
2588 #endif
2589
2590 down_read(&efx->filter_sem);
2591 efx_restore_filters(efx);
2592 up_read(&efx->filter_sem);
2593 if (efx->type->sriov_reset)
2594 efx->type->sriov_reset(efx);
2595
2596 mutex_unlock(&efx->mac_lock);
2597
2598 efx_start_all(efx);
2599
2600 return 0;
2601
2602 fail:
2603 efx->port_initialized = false;
2604
2605 mutex_unlock(&efx->mac_lock);
2606
2607 return rc;
2608 }
2609
2610 /* Reset the NIC using the specified method. Note that the reset may
2611 * fail, in which case the card will be left in an unusable state.
2612 *
2613 * Caller must hold the rtnl_lock.
2614 */
2615 int efx_reset(struct efx_nic *efx, enum reset_type method)
2616 {
2617 int rc, rc2;
2618 bool disabled;
2619
2620 netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
2621 RESET_TYPE(method));
2622
2623 efx_device_detach_sync(efx);
2624 efx_reset_down(efx, method);
2625
2626 rc = efx->type->reset(efx, method);
2627 if (rc) {
2628 netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2629 goto out;
2630 }
2631
2632 /* Clear flags for the scopes we covered. We assume the NIC and
2633 * driver are now quiescent so that there is no race here.
2634 */
2635 if (method < RESET_TYPE_MAX_METHOD)
2636 efx->reset_pending &= -(1 << (method + 1));
2637 else /* it doesn't fit into the well-ordered scope hierarchy */
2638 __clear_bit(method, &efx->reset_pending);
2639
2640 /* Reinitialise bus-mastering, which may have been turned off before
2641 * the reset was scheduled. This is still appropriate, even in the
2642 * RESET_TYPE_DISABLE since this driver generally assumes the hardware
2643 * can respond to requests. */
2644 pci_set_master(efx->pci_dev);
2645
2646 out:
2647 /* Leave device stopped if necessary */
2648 disabled = rc ||
2649 method == RESET_TYPE_DISABLE ||
2650 method == RESET_TYPE_RECOVER_OR_DISABLE;
2651 rc2 = efx_reset_up(efx, method, !disabled);
2652 if (rc2) {
2653 disabled = true;
2654 if (!rc)
2655 rc = rc2;
2656 }
2657
2658 if (disabled) {
2659 dev_close(efx->net_dev);
2660 netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2661 efx->state = STATE_DISABLED;
2662 } else {
2663 netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2664 netif_device_attach(efx->net_dev);
2665 }
2666 return rc;
2667 }
2668
2669 /* Try recovery mechanisms.
2670 * For now only EEH is supported.
2671 * Returns 0 if the recovery mechanisms are unsuccessful.
2672 * Returns a non-zero value otherwise.
2673 */
2674 int efx_try_recovery(struct efx_nic *efx)
2675 {
2676 #ifdef CONFIG_EEH
2677 /* A PCI error can occur and not be seen by EEH because nothing
2678 * happens on the PCI bus. In this case the driver may fail and
2679 * schedule a 'recover or reset', leading to this recovery handler.
2680 * Manually call the eeh failure check function.
2681 */
2682 struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
2683 if (eeh_dev_check_failure(eehdev)) {
2684 /* The EEH mechanisms will handle the error and reset the
2685 * device if necessary.
2686 */
2687 return 1;
2688 }
2689 #endif
2690 return 0;
2691 }
2692
2693 static void efx_wait_for_bist_end(struct efx_nic *efx)
2694 {
2695 int i;
2696
2697 for (i = 0; i < BIST_WAIT_DELAY_COUNT; ++i) {
2698 if (efx_mcdi_poll_reboot(efx))
2699 goto out;
2700 msleep(BIST_WAIT_DELAY_MS);
2701 }
2702
2703 netif_err(efx, drv, efx->net_dev, "Warning: No MC reboot after BIST mode\n");
2704 out:
2705 /* Either way unset the BIST flag. If we found no reboot we probably
2706 * won't recover, but we should try.
2707 */
2708 efx->mc_bist_for_other_fn = false;
2709 }
2710
2711 /* The worker thread exists so that code that cannot sleep can
2712 * schedule a reset for later.
2713 */
2714 static void efx_reset_work(struct work_struct *data)
2715 {
2716 struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2717 unsigned long pending;
2718 enum reset_type method;
2719
2720 pending = ACCESS_ONCE(efx->reset_pending);
2721 method = fls(pending) - 1;
2722
2723 if (method == RESET_TYPE_MC_BIST)
2724 efx_wait_for_bist_end(efx);
2725
2726 if ((method == RESET_TYPE_RECOVER_OR_DISABLE ||
2727 method == RESET_TYPE_RECOVER_OR_ALL) &&
2728 efx_try_recovery(efx))
2729 return;
2730
2731 if (!pending)
2732 return;
2733
2734 rtnl_lock();
2735
2736 /* We checked the state in efx_schedule_reset() but it may
2737 * have changed by now. Now that we have the RTNL lock,
2738 * it cannot change again.
2739 */
2740 if (efx->state == STATE_READY)
2741 (void)efx_reset(efx, method);
2742
2743 rtnl_unlock();
2744 }
2745
2746 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)
2747 {
2748 enum reset_type method;
2749
2750 if (efx->state == STATE_RECOVERY) {
2751 netif_dbg(efx, drv, efx->net_dev,
2752 "recovering: skip scheduling %s reset\n",
2753 RESET_TYPE(type));
2754 return;
2755 }
2756
2757 switch (type) {
2758 case RESET_TYPE_INVISIBLE:
2759 case RESET_TYPE_ALL:
2760 case RESET_TYPE_RECOVER_OR_ALL:
2761 case RESET_TYPE_WORLD:
2762 case RESET_TYPE_DISABLE:
2763 case RESET_TYPE_RECOVER_OR_DISABLE:
2764 case RESET_TYPE_DATAPATH:
2765 case RESET_TYPE_MC_BIST:
2766 case RESET_TYPE_MCDI_TIMEOUT:
2767 method = type;
2768 netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
2769 RESET_TYPE(method));
2770 break;
2771 default:
2772 method = efx->type->map_reset_reason(type);
2773 netif_dbg(efx, drv, efx->net_dev,
2774 "scheduling %s reset for %s\n",
2775 RESET_TYPE(method), RESET_TYPE(type));
2776 break;
2777 }
2778
2779 set_bit(method, &efx->reset_pending);
2780 smp_mb(); /* ensure we change reset_pending before checking state */
2781
2782 /* If we're not READY then just leave the flags set as the cue
2783 * to abort probing or reschedule the reset later.
2784 */
2785 if (ACCESS_ONCE(efx->state) != STATE_READY)
2786 return;
2787
2788 /* efx_process_channel() will no longer read events once a
2789 * reset is scheduled. So switch back to poll'd MCDI completions. */
2790 efx_mcdi_mode_poll(efx);
2791
2792 queue_work(reset_workqueue, &efx->reset_work);
2793 }
2794
2795 /**************************************************************************
2796 *
2797 * List of NICs we support
2798 *
2799 **************************************************************************/
2800
2801 /* PCI device ID table */
2802 static const struct pci_device_id efx_pci_table[] = {
2803 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
2804 PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2805 .driver_data = (unsigned long) &falcon_a1_nic_type},
2806 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
2807 PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2808 .driver_data = (unsigned long) &falcon_b0_nic_type},
2809 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803), /* SFC9020 */
2810 .driver_data = (unsigned long) &siena_a0_nic_type},
2811 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813), /* SFL9021 */
2812 .driver_data = (unsigned long) &siena_a0_nic_type},
2813 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903), /* SFC9120 PF */
2814 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2815 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903), /* SFC9120 VF */
2816 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2817 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923), /* SFC9140 PF */
2818 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2819 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1923), /* SFC9140 VF */
2820 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2821 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0a03), /* SFC9220 PF */
2822 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2823 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1a03), /* SFC9220 VF */
2824 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2825 {0} /* end of list */
2826 };
2827
2828 /**************************************************************************
2829 *
2830 * Dummy PHY/MAC operations
2831 *
2832 * Can be used for some unimplemented operations
2833 * Needed so all function pointers are valid and do not have to be tested
2834 * before use
2835 *
2836 **************************************************************************/
2837 int efx_port_dummy_op_int(struct efx_nic *efx)
2838 {
2839 return 0;
2840 }
2841 void efx_port_dummy_op_void(struct efx_nic *efx) {}
2842
2843 static bool efx_port_dummy_op_poll(struct efx_nic *efx)
2844 {
2845 return false;
2846 }
2847
2848 static const struct efx_phy_operations efx_dummy_phy_operations = {
2849 .init = efx_port_dummy_op_int,
2850 .reconfigure = efx_port_dummy_op_int,
2851 .poll = efx_port_dummy_op_poll,
2852 .fini = efx_port_dummy_op_void,
2853 };
2854
2855 /**************************************************************************
2856 *
2857 * Data housekeeping
2858 *
2859 **************************************************************************/
2860
2861 /* This zeroes out and then fills in the invariants in a struct
2862 * efx_nic (including all sub-structures).
2863 */
2864 static int efx_init_struct(struct efx_nic *efx,
2865 struct pci_dev *pci_dev, struct net_device *net_dev)
2866 {
2867 int i;
2868
2869 /* Initialise common structures */
2870 INIT_LIST_HEAD(&efx->node);
2871 INIT_LIST_HEAD(&efx->secondary_list);
2872 spin_lock_init(&efx->biu_lock);
2873 #ifdef CONFIG_SFC_MTD
2874 INIT_LIST_HEAD(&efx->mtd_list);
2875 #endif
2876 INIT_WORK(&efx->reset_work, efx_reset_work);
2877 INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
2878 INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
2879 efx->pci_dev = pci_dev;
2880 efx->msg_enable = debug;
2881 efx->state = STATE_UNINIT;
2882 strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));
2883
2884 efx->net_dev = net_dev;
2885 efx->rx_prefix_size = efx->type->rx_prefix_size;
2886 efx->rx_ip_align =
2887 NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0;
2888 efx->rx_packet_hash_offset =
2889 efx->type->rx_hash_offset - efx->type->rx_prefix_size;
2890 efx->rx_packet_ts_offset =
2891 efx->type->rx_ts_offset - efx->type->rx_prefix_size;
2892 spin_lock_init(&efx->stats_lock);
2893 mutex_init(&efx->mac_lock);
2894 efx->phy_op = &efx_dummy_phy_operations;
2895 efx->mdio.dev = net_dev;
2896 INIT_WORK(&efx->mac_work, efx_mac_work);
2897 init_waitqueue_head(&efx->flush_wq);
2898
2899 for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2900 efx->channel[i] = efx_alloc_channel(efx, i, NULL);
2901 if (!efx->channel[i])
2902 goto fail;
2903 efx->msi_context[i].efx = efx;
2904 efx->msi_context[i].index = i;
2905 }
2906
2907 /* Higher numbered interrupt modes are less capable! */
2908 efx->interrupt_mode = max(efx->type->max_interrupt_mode,
2909 interrupt_mode);
2910
2911 /* Would be good to use the net_dev name, but we're too early */
2912 snprintf(efx->workqueue_name, sizeof(efx->workqueue_name), "sfc%s",
2913 pci_name(pci_dev));
2914 efx->workqueue = create_singlethread_workqueue(efx->workqueue_name);
2915 if (!efx->workqueue)
2916 goto fail;
2917
2918 return 0;
2919
2920 fail:
2921 efx_fini_struct(efx);
2922 return -ENOMEM;
2923 }
2924
2925 static void efx_fini_struct(struct efx_nic *efx)
2926 {
2927 int i;
2928
2929 for (i = 0; i < EFX_MAX_CHANNELS; i++)
2930 kfree(efx->channel[i]);
2931
2932 kfree(efx->vpd_sn);
2933
2934 if (efx->workqueue) {
2935 destroy_workqueue(efx->workqueue);
2936 efx->workqueue = NULL;
2937 }
2938 }
2939
2940 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats)
2941 {
2942 u64 n_rx_nodesc_trunc = 0;
2943 struct efx_channel *channel;
2944
2945 efx_for_each_channel(channel, efx)
2946 n_rx_nodesc_trunc += channel->n_rx_nodesc_trunc;
2947 stats[GENERIC_STAT_rx_nodesc_trunc] = n_rx_nodesc_trunc;
2948 stats[GENERIC_STAT_rx_noskb_drops] = atomic_read(&efx->n_rx_noskb_drops);
2949 }
2950
2951 /**************************************************************************
2952 *
2953 * PCI interface
2954 *
2955 **************************************************************************/
2956
2957 /* Main body of final NIC shutdown code
2958 * This is called only at module unload (or hotplug removal).
2959 */
2960 static void efx_pci_remove_main(struct efx_nic *efx)
2961 {
2962 /* Flush reset_work. It can no longer be scheduled since we
2963 * are not READY.
2964 */
2965 BUG_ON(efx->state == STATE_READY);
2966 cancel_work_sync(&efx->reset_work);
2967
2968 efx_disable_interrupts(efx);
2969 efx_nic_fini_interrupt(efx);
2970 efx_fini_port(efx);
2971 efx->type->fini(efx);
2972 efx_fini_napi(efx);
2973 efx_remove_all(efx);
2974 }
2975
2976 /* Final NIC shutdown
2977 * This is called only at module unload (or hotplug removal). A PF can call
2978 * this on its VFs to ensure they are unbound first.
2979 */
2980 static void efx_pci_remove(struct pci_dev *pci_dev)
2981 {
2982 struct efx_nic *efx;
2983
2984 efx = pci_get_drvdata(pci_dev);
2985 if (!efx)
2986 return;
2987
2988 /* Mark the NIC as fini, then stop the interface */
2989 rtnl_lock();
2990 efx_dissociate(efx);
2991 dev_close(efx->net_dev);
2992 efx_disable_interrupts(efx);
2993 efx->state = STATE_UNINIT;
2994 rtnl_unlock();
2995
2996 if (efx->type->sriov_fini)
2997 efx->type->sriov_fini(efx);
2998
2999 efx_unregister_netdev(efx);
3000
3001 efx_mtd_remove(efx);
3002
3003 efx_pci_remove_main(efx);
3004
3005 efx_fini_io(efx);
3006 netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
3007
3008 efx_fini_struct(efx);
3009 free_netdev(efx->net_dev);
3010
3011 pci_disable_pcie_error_reporting(pci_dev);
3012 };
3013
3014 /* NIC VPD information
3015 * Called during probe to display the part number of the
3016 * installed NIC. VPD is potentially very large but this should
3017 * always appear within the first 512 bytes.
3018 */
3019 #define SFC_VPD_LEN 512
3020 static void efx_probe_vpd_strings(struct efx_nic *efx)
3021 {
3022 struct pci_dev *dev = efx->pci_dev;
3023 char vpd_data[SFC_VPD_LEN];
3024 ssize_t vpd_size;
3025 int ro_start, ro_size, i, j;
3026
3027 /* Get the vpd data from the device */
3028 vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
3029 if (vpd_size <= 0) {
3030 netif_err(efx, drv, efx->net_dev, "Unable to read VPD\n");
3031 return;
3032 }
3033
3034 /* Get the Read only section */
3035 ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
3036 if (ro_start < 0) {
3037 netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
3038 return;
3039 }
3040
3041 ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
3042 j = ro_size;
3043 i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
3044 if (i + j > vpd_size)
3045 j = vpd_size - i;
3046
3047 /* Get the Part number */
3048 i = pci_vpd_find_info_keyword(vpd_data, i, j, "PN");
3049 if (i < 0) {
3050 netif_err(efx, drv, efx->net_dev, "Part number not found\n");
3051 return;
3052 }
3053
3054 j = pci_vpd_info_field_size(&vpd_data[i]);
3055 i += PCI_VPD_INFO_FLD_HDR_SIZE;
3056 if (i + j > vpd_size) {
3057 netif_err(efx, drv, efx->net_dev, "Incomplete part number\n");
3058 return;
3059 }
3060
3061 netif_info(efx, drv, efx->net_dev,
3062 "Part Number : %.*s\n", j, &vpd_data[i]);
3063
3064 i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
3065 j = ro_size;
3066 i = pci_vpd_find_info_keyword(vpd_data, i, j, "SN");
3067 if (i < 0) {
3068 netif_err(efx, drv, efx->net_dev, "Serial number not found\n");
3069 return;
3070 }
3071
3072 j = pci_vpd_info_field_size(&vpd_data[i]);
3073 i += PCI_VPD_INFO_FLD_HDR_SIZE;
3074 if (i + j > vpd_size) {
3075 netif_err(efx, drv, efx->net_dev, "Incomplete serial number\n");
3076 return;
3077 }
3078
3079 efx->vpd_sn = kmalloc(j + 1, GFP_KERNEL);
3080 if (!efx->vpd_sn)
3081 return;
3082
3083 snprintf(efx->vpd_sn, j + 1, "%s", &vpd_data[i]);
3084 }
3085
3086
3087 /* Main body of NIC initialisation
3088 * This is called at module load (or hotplug insertion, theoretically).
3089 */
3090 static int efx_pci_probe_main(struct efx_nic *efx)
3091 {
3092 int rc;
3093
3094 /* Do start-of-day initialisation */
3095 rc = efx_probe_all(efx);
3096 if (rc)
3097 goto fail1;
3098
3099 efx_init_napi(efx);
3100
3101 rc = efx->type->init(efx);
3102 if (rc) {
3103 netif_err(efx, probe, efx->net_dev,
3104 "failed to initialise NIC\n");
3105 goto fail3;
3106 }
3107
3108 rc = efx_init_port(efx);
3109 if (rc) {
3110 netif_err(efx, probe, efx->net_dev,
3111 "failed to initialise port\n");
3112 goto fail4;
3113 }
3114
3115 rc = efx_nic_init_interrupt(efx);
3116 if (rc)
3117 goto fail5;
3118 rc = efx_enable_interrupts(efx);
3119 if (rc)
3120 goto fail6;
3121
3122 return 0;
3123
3124 fail6:
3125 efx_nic_fini_interrupt(efx);
3126 fail5:
3127 efx_fini_port(efx);
3128 fail4:
3129 efx->type->fini(efx);
3130 fail3:
3131 efx_fini_napi(efx);
3132 efx_remove_all(efx);
3133 fail1:
3134 return rc;
3135 }
3136
3137 /* NIC initialisation
3138 *
3139 * This is called at module load (or hotplug insertion,
3140 * theoretically). It sets up PCI mappings, resets the NIC,
3141 * sets up and registers the network devices with the kernel and hooks
3142 * the interrupt service routine. It does not prepare the device for
3143 * transmission; this is left to the first time one of the network
3144 * interfaces is brought up (i.e. efx_net_open).
3145 */
3146 static int efx_pci_probe(struct pci_dev *pci_dev,
3147 const struct pci_device_id *entry)
3148 {
3149 struct net_device *net_dev;
3150 struct efx_nic *efx;
3151 int rc;
3152
3153 /* Allocate and initialise a struct net_device and struct efx_nic */
3154 net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
3155 EFX_MAX_RX_QUEUES);
3156 if (!net_dev)
3157 return -ENOMEM;
3158 efx = netdev_priv(net_dev);
3159 efx->type = (const struct efx_nic_type *) entry->driver_data;
3160 efx->fixed_features |= NETIF_F_HIGHDMA;
3161 net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
3162 NETIF_F_TSO | NETIF_F_RXCSUM);
3163 if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
3164 net_dev->features |= NETIF_F_TSO6;
3165 /* Mask for features that also apply to VLAN devices */
3166 net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
3167 NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
3168 NETIF_F_RXCSUM);
3169 net_dev->features |= efx->fixed_features;
3170 net_dev->hw_features = net_dev->features & ~efx->fixed_features;
3171 pci_set_drvdata(pci_dev, efx);
3172 SET_NETDEV_DEV(net_dev, &pci_dev->dev);
3173 rc = efx_init_struct(efx, pci_dev, net_dev);
3174 if (rc)
3175 goto fail1;
3176
3177 netif_info(efx, probe, efx->net_dev,
3178 "Solarflare NIC detected\n");
3179
3180 if (!efx->type->is_vf)
3181 efx_probe_vpd_strings(efx);
3182
3183 /* Set up basic I/O (BAR mappings etc) */
3184 rc = efx_init_io(efx);
3185 if (rc)
3186 goto fail2;
3187
3188 rc = efx_pci_probe_main(efx);
3189 if (rc)
3190 goto fail3;
3191
3192 rc = efx_register_netdev(efx);
3193 if (rc)
3194 goto fail4;
3195
3196 if (efx->type->sriov_init) {
3197 rc = efx->type->sriov_init(efx);
3198 if (rc)
3199 netif_err(efx, probe, efx->net_dev,
3200 "SR-IOV can't be enabled rc %d\n", rc);
3201 }
3202
3203 netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
3204
3205 /* Try to create MTDs, but allow this to fail */
3206 rtnl_lock();
3207 rc = efx_mtd_probe(efx);
3208 rtnl_unlock();
3209 if (rc && rc != -EPERM)
3210 netif_warn(efx, probe, efx->net_dev,
3211 "failed to create MTDs (%d)\n", rc);
3212
3213 rc = pci_enable_pcie_error_reporting(pci_dev);
3214 if (rc && rc != -EINVAL)
3215 netif_notice(efx, probe, efx->net_dev,
3216 "PCIE error reporting unavailable (%d).\n",
3217 rc);
3218
3219 return 0;
3220
3221 fail4:
3222 efx_pci_remove_main(efx);
3223 fail3:
3224 efx_fini_io(efx);
3225 fail2:
3226 efx_fini_struct(efx);
3227 fail1:
3228 WARN_ON(rc > 0);
3229 netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
3230 free_netdev(net_dev);
3231 return rc;
3232 }
3233
3234 /* efx_pci_sriov_configure returns the actual number of Virtual Functions
3235 * enabled on success
3236 */
3237 #ifdef CONFIG_SFC_SRIOV
3238 static int efx_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
3239 {
3240 int rc;
3241 struct efx_nic *efx = pci_get_drvdata(dev);
3242
3243 if (efx->type->sriov_configure) {
3244 rc = efx->type->sriov_configure(efx, num_vfs);
3245 if (rc)
3246 return rc;
3247 else
3248 return num_vfs;
3249 } else
3250 return -EOPNOTSUPP;
3251 }
3252 #endif
3253
3254 static int efx_pm_freeze(struct device *dev)
3255 {
3256 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
3257
3258 rtnl_lock();
3259
3260 if (efx->state != STATE_DISABLED) {
3261 efx->state = STATE_UNINIT;
3262
3263 efx_device_detach_sync(efx);
3264
3265 efx_stop_all(efx);
3266 efx_disable_interrupts(efx);
3267 }
3268
3269 rtnl_unlock();
3270
3271 return 0;
3272 }
3273
3274 static int efx_pm_thaw(struct device *dev)
3275 {
3276 int rc;
3277 struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
3278
3279 rtnl_lock();
3280
3281 if (efx->state != STATE_DISABLED) {
3282 rc = efx_enable_interrupts(efx);
3283 if (rc)
3284 goto fail;
3285
3286 mutex_lock(&efx->mac_lock);
3287 efx->phy_op->reconfigure(efx);
3288 mutex_unlock(&efx->mac_lock);
3289
3290 efx_start_all(efx);
3291
3292 netif_device_attach(efx->net_dev);
3293
3294 efx->state = STATE_READY;
3295
3296 efx->type->resume_wol(efx);
3297 }
3298
3299 rtnl_unlock();
3300
3301 /* Reschedule any quenched resets scheduled during efx_pm_freeze() */
3302 queue_work(reset_workqueue, &efx->reset_work);
3303
3304 return 0;
3305
3306 fail:
3307 rtnl_unlock();
3308
3309 return rc;
3310 }
3311
3312 static int efx_pm_poweroff(struct device *dev)
3313 {
3314 struct pci_dev *pci_dev = to_pci_dev(dev);
3315 struct efx_nic *efx = pci_get_drvdata(pci_dev);
3316
3317 efx->type->fini(efx);
3318
3319 efx->reset_pending = 0;
3320
3321 pci_save_state(pci_dev);
3322 return pci_set_power_state(pci_dev, PCI_D3hot);
3323 }
3324
3325 /* Used for both resume and restore */
3326 static int efx_pm_resume(struct device *dev)
3327 {
3328 struct pci_dev *pci_dev = to_pci_dev(dev);
3329 struct efx_nic *efx = pci_get_drvdata(pci_dev);
3330 int rc;
3331
3332 rc = pci_set_power_state(pci_dev, PCI_D0);
3333 if (rc)
3334 return rc;
3335 pci_restore_state(pci_dev);
3336 rc = pci_enable_device(pci_dev);
3337 if (rc)
3338 return rc;
3339 pci_set_master(efx->pci_dev);
3340 rc = efx->type->reset(efx, RESET_TYPE_ALL);
3341 if (rc)
3342 return rc;
3343 rc = efx->type->init(efx);
3344 if (rc)
3345 return rc;
3346 rc = efx_pm_thaw(dev);
3347 return rc;
3348 }
3349
3350 static int efx_pm_suspend(struct device *dev)
3351 {
3352 int rc;
3353
3354 efx_pm_freeze(dev);
3355 rc = efx_pm_poweroff(dev);
3356 if (rc)
3357 efx_pm_resume(dev);
3358 return rc;
3359 }
3360
3361 static const struct dev_pm_ops efx_pm_ops = {
3362 .suspend = efx_pm_suspend,
3363 .resume = efx_pm_resume,
3364 .freeze = efx_pm_freeze,
3365 .thaw = efx_pm_thaw,
3366 .poweroff = efx_pm_poweroff,
3367 .restore = efx_pm_resume,
3368 };
3369
3370 /* A PCI error affecting this device was detected.
3371 * At this point MMIO and DMA may be disabled.
3372 * Stop the software path and request a slot reset.
3373 */
3374 static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
3375 enum pci_channel_state state)
3376 {
3377 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
3378 struct efx_nic *efx = pci_get_drvdata(pdev);
3379
3380 if (state == pci_channel_io_perm_failure)
3381 return PCI_ERS_RESULT_DISCONNECT;
3382
3383 rtnl_lock();
3384
3385 if (efx->state != STATE_DISABLED) {
3386 efx->state = STATE_RECOVERY;
3387 efx->reset_pending = 0;
3388
3389 efx_device_detach_sync(efx);
3390
3391 efx_stop_all(efx);
3392 efx_disable_interrupts(efx);
3393
3394 status = PCI_ERS_RESULT_NEED_RESET;
3395 } else {
3396 /* If the interface is disabled we don't want to do anything
3397 * with it.
3398 */
3399 status = PCI_ERS_RESULT_RECOVERED;
3400 }
3401
3402 rtnl_unlock();
3403
3404 pci_disable_device(pdev);
3405
3406 return status;
3407 }
3408
3409 /* Fake a successful reset, which will be performed later in efx_io_resume. */
3410 static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
3411 {
3412 struct efx_nic *efx = pci_get_drvdata(pdev);
3413 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
3414 int rc;
3415
3416 if (pci_enable_device(pdev)) {
3417 netif_err(efx, hw, efx->net_dev,
3418 "Cannot re-enable PCI device after reset.\n");
3419 status = PCI_ERS_RESULT_DISCONNECT;
3420 }
3421
3422 rc = pci_cleanup_aer_uncorrect_error_status(pdev);
3423 if (rc) {
3424 netif_err(efx, hw, efx->net_dev,
3425 "pci_cleanup_aer_uncorrect_error_status failed (%d)\n", rc);
3426 /* Non-fatal error. Continue. */
3427 }
3428
3429 return status;
3430 }
3431
3432 /* Perform the actual reset and resume I/O operations. */
3433 static void efx_io_resume(struct pci_dev *pdev)
3434 {
3435 struct efx_nic *efx = pci_get_drvdata(pdev);
3436 int rc;
3437
3438 rtnl_lock();
3439
3440 if (efx->state == STATE_DISABLED)
3441 goto out;
3442
3443 rc = efx_reset(efx, RESET_TYPE_ALL);
3444 if (rc) {
3445 netif_err(efx, hw, efx->net_dev,
3446 "efx_reset failed after PCI error (%d)\n", rc);
3447 } else {
3448 efx->state = STATE_READY;
3449 netif_dbg(efx, hw, efx->net_dev,
3450 "Done resetting and resuming IO after PCI error.\n");
3451 }
3452
3453 out:
3454 rtnl_unlock();
3455 }
3456
3457 /* For simplicity and reliability, we always require a slot reset and try to
3458 * reset the hardware when a pci error affecting the device is detected.
3459 * We leave both the link_reset and mmio_enabled callback unimplemented:
3460 * with our request for slot reset the mmio_enabled callback will never be
3461 * called, and the link_reset callback is not used by AER or EEH mechanisms.
3462 */
3463 static const struct pci_error_handlers efx_err_handlers = {
3464 .error_detected = efx_io_error_detected,
3465 .slot_reset = efx_io_slot_reset,
3466 .resume = efx_io_resume,
3467 };
3468
3469 static struct pci_driver efx_pci_driver = {
3470 .name = KBUILD_MODNAME,
3471 .id_table = efx_pci_table,
3472 .probe = efx_pci_probe,
3473 .remove = efx_pci_remove,
3474 .driver.pm = &efx_pm_ops,
3475 .err_handler = &efx_err_handlers,
3476 #ifdef CONFIG_SFC_SRIOV
3477 .sriov_configure = efx_pci_sriov_configure,
3478 #endif
3479 };
3480
3481 /**************************************************************************
3482 *
3483 * Kernel module interface
3484 *
3485 *************************************************************************/
3486
3487 module_param(interrupt_mode, uint, 0444);
3488 MODULE_PARM_DESC(interrupt_mode,
3489 "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");
3490
3491 static int __init efx_init_module(void)
3492 {
3493 int rc;
3494
3495 printk(KERN_INFO "Solarflare NET driver v" EFX_DRIVER_VERSION "\n");
3496
3497 rc = register_netdevice_notifier(&efx_netdev_notifier);
3498 if (rc)
3499 goto err_notifier;
3500
3501 #ifdef CONFIG_SFC_SRIOV
3502 rc = efx_init_sriov();
3503 if (rc)
3504 goto err_sriov;
3505 #endif
3506
3507 reset_workqueue = create_singlethread_workqueue("sfc_reset");
3508 if (!reset_workqueue) {
3509 rc = -ENOMEM;
3510 goto err_reset;
3511 }
3512
3513 rc = pci_register_driver(&efx_pci_driver);
3514 if (rc < 0)
3515 goto err_pci;
3516
3517 return 0;
3518
3519 err_pci:
3520 destroy_workqueue(reset_workqueue);
3521 err_reset:
3522 #ifdef CONFIG_SFC_SRIOV
3523 efx_fini_sriov();
3524 err_sriov:
3525 #endif
3526 unregister_netdevice_notifier(&efx_netdev_notifier);
3527 err_notifier:
3528 return rc;
3529 }
3530
3531 static void __exit efx_exit_module(void)
3532 {
3533 printk(KERN_INFO "Solarflare NET driver unloading\n");
3534
3535 pci_unregister_driver(&efx_pci_driver);
3536 destroy_workqueue(reset_workqueue);
3537 #ifdef CONFIG_SFC_SRIOV
3538 efx_fini_sriov();
3539 #endif
3540 unregister_netdevice_notifier(&efx_netdev_notifier);
3541
3542 }
3543
3544 module_init(efx_init_module);
3545 module_exit(efx_exit_module);
3546
3547 MODULE_AUTHOR("Solarflare Communications and "
3548 "Michael Brown <mbrown@fensystems.co.uk>");
3549 MODULE_DESCRIPTION("Solarflare network driver");
3550 MODULE_LICENSE("GPL");
3551 MODULE_DEVICE_TABLE(pci, efx_pci_table);
Linux kernel - Deliverables
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