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1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2006-2012 Solarflare Communications Inc.
6 */
7
8#include <linux/netdevice.h>
9#include <linux/module.h>
10#include <linux/delay.h>
11#include <linux/kernel_stat.h>
12#include <linux/pci.h>
13#include <linux/ethtool.h>
14#include <linux/ip.h>
15#include <linux/in.h>
16#include <linux/udp.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include "net_driver.h"
20#include "efx.h"
21#include "efx_common.h"
22#include "efx_channels.h"
23#include "nic.h"
24#include "mcdi_port_common.h"
25#include "selftest.h"
26#include "workarounds.h"
27
28/* IRQ latency can be enormous because:
29 * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
30 * slow serial console or an old IDE driver doing error recovery
31 * - The PREEMPT_RT patches mostly deal with this, but also allow a
32 * tasklet or normal task to be given higher priority than our IRQ
33 * threads
34 * Try to avoid blaming the hardware for this.
35 */
36#define IRQ_TIMEOUT HZ
37
38/*
39 * Loopback test packet structure
40 *
41 * The self-test should stress every RSS vector.
42 */
43struct efx_loopback_payload {
44 char pad[2]; /* Ensures ip is 4-byte aligned */
45 struct_group_attr(packet, __packed,
46 struct ethhdr header;
47 struct iphdr ip;
48 struct udphdr udp;
49 __be16 iteration;
50 char msg[64];
51 );
52} __packed __aligned(4);
53#define EFX_LOOPBACK_PAYLOAD_LEN \
54 sizeof_field(struct efx_loopback_payload, packet)
55
56/* Loopback test source MAC address */
57static const u8 payload_source[ETH_ALEN] __aligned(2) = {
58 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
59};
60
61static const char payload_msg[] =
62 "Hello world! This is an Efx loopback test in progress!";
63
64/* Interrupt mode names */
65static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
66static const char *const efx_interrupt_mode_names[] = {
67 [EFX_INT_MODE_MSIX] = "MSI-X",
68 [EFX_INT_MODE_MSI] = "MSI",
69 [EFX_INT_MODE_LEGACY] = "legacy",
70};
71#define INT_MODE(efx) \
72 STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
73
74/**
75 * struct efx_loopback_state - persistent state during a loopback selftest
76 * @flush: Drop all packets in efx_loopback_rx_packet
77 * @packet_count: Number of packets being used in this test
78 * @skbs: An array of skbs transmitted
79 * @offload_csum: Checksums are being offloaded
80 * @rx_good: RX good packet count
81 * @rx_bad: RX bad packet count
82 * @payload: Payload used in tests
83 */
84struct efx_loopback_state {
85 bool flush;
86 int packet_count;
87 struct sk_buff **skbs;
88 bool offload_csum;
89 atomic_t rx_good;
90 atomic_t rx_bad;
91 struct efx_loopback_payload payload;
92};
93
94/* How long to wait for all the packets to arrive (in ms) */
95#define LOOPBACK_TIMEOUT_MS 1000
96
97/**************************************************************************
98 *
99 * MII, NVRAM and register tests
100 *
101 **************************************************************************/
102
103static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
104{
105 int rc = 0;
106
107 rc = efx_mcdi_phy_test_alive(efx);
108 tests->phy_alive = rc ? -1 : 1;
109
110 return rc;
111}
112
113static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
114{
115 int rc = 0;
116
117 if (efx->type->test_nvram) {
118 rc = efx->type->test_nvram(efx);
119 if (rc == -EPERM)
120 rc = 0;
121 else
122 tests->nvram = rc ? -1 : 1;
123 }
124
125 return rc;
126}
127
128/**************************************************************************
129 *
130 * Interrupt and event queue testing
131 *
132 **************************************************************************/
133
134/* Test generation and receipt of interrupts */
135static int efx_test_interrupts(struct efx_nic *efx,
136 struct efx_self_tests *tests)
137{
138 unsigned long timeout, wait;
139 int cpu;
140 int rc;
141
142 netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
143 tests->interrupt = -1;
144
145 rc = efx_nic_irq_test_start(efx);
146 if (rc == -ENOTSUPP) {
147 netif_dbg(efx, drv, efx->net_dev,
148 "direct interrupt testing not supported\n");
149 tests->interrupt = 0;
150 return 0;
151 }
152
153 timeout = jiffies + IRQ_TIMEOUT;
154 wait = 1;
155
156 /* Wait for arrival of test interrupt. */
157 netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
158 do {
159 schedule_timeout_uninterruptible(wait);
160 cpu = efx_nic_irq_test_irq_cpu(efx);
161 if (cpu >= 0)
162 goto success;
163 wait *= 2;
164 } while (time_before(jiffies, timeout));
165
166 netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
167 return -ETIMEDOUT;
168
169 success:
170 netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
171 INT_MODE(efx), cpu);
172 tests->interrupt = 1;
173 return 0;
174}
175
176/* Test generation and receipt of interrupting events */
177static int efx_test_eventq_irq(struct efx_nic *efx,
178 struct efx_self_tests *tests)
179{
180 struct efx_channel *channel;
181 unsigned int read_ptr[EFX_MAX_CHANNELS];
182 unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
183 unsigned long timeout, wait;
184
185 BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
186
187 efx_for_each_channel(channel, efx) {
188 read_ptr[channel->channel] = channel->eventq_read_ptr;
189 set_bit(channel->channel, &dma_pend);
190 set_bit(channel->channel, &int_pend);
191 efx_nic_event_test_start(channel);
192 }
193
194 timeout = jiffies + IRQ_TIMEOUT;
195 wait = 1;
196
197 /* Wait for arrival of interrupts. NAPI processing may or may
198 * not complete in time, but we can cope in any case.
199 */
200 do {
201 schedule_timeout_uninterruptible(wait);
202
203 efx_for_each_channel(channel, efx) {
204 efx_stop_eventq(channel);
205 if (channel->eventq_read_ptr !=
206 read_ptr[channel->channel]) {
207 set_bit(channel->channel, &napi_ran);
208 clear_bit(channel->channel, &dma_pend);
209 clear_bit(channel->channel, &int_pend);
210 } else {
211 if (efx_nic_event_present(channel))
212 clear_bit(channel->channel, &dma_pend);
213 if (efx_nic_event_test_irq_cpu(channel) >= 0)
214 clear_bit(channel->channel, &int_pend);
215 }
216 efx_start_eventq(channel);
217 }
218
219 wait *= 2;
220 } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
221
222 efx_for_each_channel(channel, efx) {
223 bool dma_seen = !test_bit(channel->channel, &dma_pend);
224 bool int_seen = !test_bit(channel->channel, &int_pend);
225
226 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
227 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
228
229 if (dma_seen && int_seen) {
230 netif_dbg(efx, drv, efx->net_dev,
231 "channel %d event queue passed (with%s NAPI)\n",
232 channel->channel,
233 test_bit(channel->channel, &napi_ran) ?
234 "" : "out");
235 } else {
236 /* Report failure and whether either interrupt or DMA
237 * worked
238 */
239 netif_err(efx, drv, efx->net_dev,
240 "channel %d timed out waiting for event queue\n",
241 channel->channel);
242 if (int_seen)
243 netif_err(efx, drv, efx->net_dev,
244 "channel %d saw interrupt "
245 "during event queue test\n",
246 channel->channel);
247 if (dma_seen)
248 netif_err(efx, drv, efx->net_dev,
249 "channel %d event was generated, but "
250 "failed to trigger an interrupt\n",
251 channel->channel);
252 }
253 }
254
255 return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
256}
257
258static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
259 unsigned flags)
260{
261 int rc;
262
263 mutex_lock(&efx->mac_lock);
264 rc = efx_mcdi_phy_run_tests(efx, tests->phy_ext, flags);
265 mutex_unlock(&efx->mac_lock);
266 if (rc == -EPERM)
267 rc = 0;
268 else
269 netif_info(efx, drv, efx->net_dev,
270 "%s phy selftest\n", rc ? "Failed" : "Passed");
271
272 return rc;
273}
274
275/**************************************************************************
276 *
277 * Loopback testing
278 * NB Only one loopback test can be executing concurrently.
279 *
280 **************************************************************************/
281
282/* Loopback test RX callback
283 * This is called for each received packet during loopback testing.
284 */
285void efx_loopback_rx_packet(struct efx_nic *efx,
286 const char *buf_ptr, int pkt_len)
287{
288 struct efx_loopback_state *state = efx->loopback_selftest;
289 struct efx_loopback_payload received;
290 struct efx_loopback_payload *payload;
291
292 BUG_ON(!buf_ptr);
293
294 /* If we are just flushing, then drop the packet */
295 if ((state == NULL) || state->flush)
296 return;
297
298 payload = &state->payload;
299
300 memcpy(&received.packet, buf_ptr,
301 min_t(int, pkt_len, EFX_LOOPBACK_PAYLOAD_LEN));
302 received.ip.saddr = payload->ip.saddr;
303 if (state->offload_csum)
304 received.ip.check = payload->ip.check;
305
306 /* Check that header exists */
307 if (pkt_len < sizeof(received.header)) {
308 netif_err(efx, drv, efx->net_dev,
309 "saw runt RX packet (length %d) in %s loopback "
310 "test\n", pkt_len, LOOPBACK_MODE(efx));
311 goto err;
312 }
313
314 /* Check that the ethernet header exists */
315 if (memcmp(&received.header, &payload->header, ETH_HLEN) != 0) {
316 netif_err(efx, drv, efx->net_dev,
317 "saw non-loopback RX packet in %s loopback test\n",
318 LOOPBACK_MODE(efx));
319 goto err;
320 }
321
322 /* Check packet length */
323 if (pkt_len != EFX_LOOPBACK_PAYLOAD_LEN) {
324 netif_err(efx, drv, efx->net_dev,
325 "saw incorrect RX packet length %d (wanted %d) in "
326 "%s loopback test\n", pkt_len,
327 (int)EFX_LOOPBACK_PAYLOAD_LEN, LOOPBACK_MODE(efx));
328 goto err;
329 }
330
331 /* Check that IP header matches */
332 if (memcmp(&received.ip, &payload->ip, sizeof(payload->ip)) != 0) {
333 netif_err(efx, drv, efx->net_dev,
334 "saw corrupted IP header in %s loopback test\n",
335 LOOPBACK_MODE(efx));
336 goto err;
337 }
338
339 /* Check that msg and padding matches */
340 if (memcmp(&received.msg, &payload->msg, sizeof(received.msg)) != 0) {
341 netif_err(efx, drv, efx->net_dev,
342 "saw corrupted RX packet in %s loopback test\n",
343 LOOPBACK_MODE(efx));
344 goto err;
345 }
346
347 /* Check that iteration matches */
348 if (received.iteration != payload->iteration) {
349 netif_err(efx, drv, efx->net_dev,
350 "saw RX packet from iteration %d (wanted %d) in "
351 "%s loopback test\n", ntohs(received.iteration),
352 ntohs(payload->iteration), LOOPBACK_MODE(efx));
353 goto err;
354 }
355
356 /* Increase correct RX count */
357 netif_vdbg(efx, drv, efx->net_dev,
358 "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
359
360 atomic_inc(&state->rx_good);
361 return;
362
363 err:
364#ifdef DEBUG
365 if (atomic_read(&state->rx_bad) == 0) {
366 netif_err(efx, drv, efx->net_dev, "received packet:\n");
367 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
368 buf_ptr, pkt_len, 0);
369 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
370 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
371 &state->payload.packet, EFX_LOOPBACK_PAYLOAD_LEN,
372 0);
373 }
374#endif
375 atomic_inc(&state->rx_bad);
376}
377
378/* Initialise an efx_selftest_state for a new iteration */
379static void efx_iterate_state(struct efx_nic *efx)
380{
381 struct efx_loopback_state *state = efx->loopback_selftest;
382 struct net_device *net_dev = efx->net_dev;
383 struct efx_loopback_payload *payload = &state->payload;
384
385 /* Initialise the layerII header */
386 ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
387 ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
388 payload->header.h_proto = htons(ETH_P_IP);
389
390 /* saddr set later and used as incrementing count */
391 payload->ip.daddr = htonl(INADDR_LOOPBACK);
392 payload->ip.ihl = 5;
393 payload->ip.check = (__force __sum16) htons(0xdead);
394 payload->ip.tot_len = htons(sizeof(*payload) -
395 offsetof(struct efx_loopback_payload, ip));
396 payload->ip.version = IPVERSION;
397 payload->ip.protocol = IPPROTO_UDP;
398
399 /* Initialise udp header */
400 payload->udp.source = 0;
401 payload->udp.len = htons(sizeof(*payload) -
402 offsetof(struct efx_loopback_payload, udp));
403 payload->udp.check = 0; /* checksum ignored */
404
405 /* Fill out payload */
406 payload->iteration = htons(ntohs(payload->iteration) + 1);
407 memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
408
409 /* Fill out remaining state members */
410 atomic_set(&state->rx_good, 0);
411 atomic_set(&state->rx_bad, 0);
412 smp_wmb();
413}
414
415static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
416{
417 struct efx_nic *efx = tx_queue->efx;
418 struct efx_loopback_state *state = efx->loopback_selftest;
419 struct efx_loopback_payload *payload;
420 struct sk_buff *skb;
421 int i;
422 netdev_tx_t rc;
423
424 /* Transmit N copies of buffer */
425 for (i = 0; i < state->packet_count; i++) {
426 /* Allocate an skb, holding an extra reference for
427 * transmit completion counting */
428 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
429 if (!skb)
430 return -ENOMEM;
431 state->skbs[i] = skb;
432 skb_get(skb);
433
434 /* Copy the payload in, incrementing the source address to
435 * exercise the rss vectors */
436 payload = skb_put(skb, sizeof(state->payload));
437 memcpy(payload, &state->payload, sizeof(state->payload));
438 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
439 /* Strip off the leading padding */
440 skb_pull(skb, offsetof(struct efx_loopback_payload, header));
441 /* Strip off the trailing padding */
442 skb_trim(skb, EFX_LOOPBACK_PAYLOAD_LEN);
443
444 /* Ensure everything we've written is visible to the
445 * interrupt handler. */
446 smp_wmb();
447
448 netif_tx_lock_bh(efx->net_dev);
449 rc = efx_enqueue_skb(tx_queue, skb);
450 netif_tx_unlock_bh(efx->net_dev);
451
452 if (rc != NETDEV_TX_OK) {
453 netif_err(efx, drv, efx->net_dev,
454 "TX queue %d could not transmit packet %d of "
455 "%d in %s loopback test\n", tx_queue->label,
456 i + 1, state->packet_count,
457 LOOPBACK_MODE(efx));
458
459 /* Defer cleaning up the other skbs for the caller */
460 kfree_skb(skb);
461 return -EPIPE;
462 }
463 }
464
465 return 0;
466}
467
468static int efx_poll_loopback(struct efx_nic *efx)
469{
470 struct efx_loopback_state *state = efx->loopback_selftest;
471
472 return atomic_read(&state->rx_good) == state->packet_count;
473}
474
475static int efx_end_loopback(struct efx_tx_queue *tx_queue,
476 struct efx_loopback_self_tests *lb_tests)
477{
478 struct efx_nic *efx = tx_queue->efx;
479 struct efx_loopback_state *state = efx->loopback_selftest;
480 struct sk_buff *skb;
481 int tx_done = 0, rx_good, rx_bad;
482 int i, rc = 0;
483
484 netif_tx_lock_bh(efx->net_dev);
485
486 /* Count the number of tx completions, and decrement the refcnt. Any
487 * skbs not already completed will be free'd when the queue is flushed */
488 for (i = 0; i < state->packet_count; i++) {
489 skb = state->skbs[i];
490 if (skb && !skb_shared(skb))
491 ++tx_done;
492 dev_kfree_skb(skb);
493 }
494
495 netif_tx_unlock_bh(efx->net_dev);
496
497 /* Check TX completion and received packet counts */
498 rx_good = atomic_read(&state->rx_good);
499 rx_bad = atomic_read(&state->rx_bad);
500 if (tx_done != state->packet_count) {
501 /* Don't free the skbs; they will be picked up on TX
502 * overflow or channel teardown.
503 */
504 netif_err(efx, drv, efx->net_dev,
505 "TX queue %d saw only %d out of an expected %d "
506 "TX completion events in %s loopback test\n",
507 tx_queue->label, tx_done, state->packet_count,
508 LOOPBACK_MODE(efx));
509 rc = -ETIMEDOUT;
510 /* Allow to fall through so we see the RX errors as well */
511 }
512
513 /* We may always be up to a flush away from our desired packet total */
514 if (rx_good != state->packet_count) {
515 netif_dbg(efx, drv, efx->net_dev,
516 "TX queue %d saw only %d out of an expected %d "
517 "received packets in %s loopback test\n",
518 tx_queue->label, rx_good, state->packet_count,
519 LOOPBACK_MODE(efx));
520 rc = -ETIMEDOUT;
521 /* Fall through */
522 }
523
524 /* Update loopback test structure */
525 lb_tests->tx_sent[tx_queue->label] += state->packet_count;
526 lb_tests->tx_done[tx_queue->label] += tx_done;
527 lb_tests->rx_good += rx_good;
528 lb_tests->rx_bad += rx_bad;
529
530 return rc;
531}
532
533static int
534efx_test_loopback(struct efx_tx_queue *tx_queue,
535 struct efx_loopback_self_tests *lb_tests)
536{
537 struct efx_nic *efx = tx_queue->efx;
538 struct efx_loopback_state *state = efx->loopback_selftest;
539 int i, begin_rc, end_rc;
540
541 for (i = 0; i < 3; i++) {
542 /* Determine how many packets to send */
543 state->packet_count = efx->txq_entries / 3;
544 state->packet_count = min(1 << (i << 2), state->packet_count);
545 state->skbs = kcalloc(state->packet_count,
546 sizeof(state->skbs[0]), GFP_KERNEL);
547 if (!state->skbs)
548 return -ENOMEM;
549 state->flush = false;
550
551 netif_dbg(efx, drv, efx->net_dev,
552 "TX queue %d (hw %d) testing %s loopback with %d packets\n",
553 tx_queue->label, tx_queue->queue, LOOPBACK_MODE(efx),
554 state->packet_count);
555
556 efx_iterate_state(efx);
557 begin_rc = efx_begin_loopback(tx_queue);
558
559 /* This will normally complete very quickly, but be
560 * prepared to wait much longer. */
561 msleep(1);
562 if (!efx_poll_loopback(efx)) {
563 msleep(LOOPBACK_TIMEOUT_MS);
564 efx_poll_loopback(efx);
565 }
566
567 end_rc = efx_end_loopback(tx_queue, lb_tests);
568 kfree(state->skbs);
569
570 if (begin_rc || end_rc) {
571 /* Wait a while to ensure there are no packets
572 * floating around after a failure. */
573 schedule_timeout_uninterruptible(HZ / 10);
574 return begin_rc ? begin_rc : end_rc;
575 }
576 }
577
578 netif_dbg(efx, drv, efx->net_dev,
579 "TX queue %d passed %s loopback test with a burst length "
580 "of %d packets\n", tx_queue->label, LOOPBACK_MODE(efx),
581 state->packet_count);
582
583 return 0;
584}
585
586static int efx_wait_for_link(struct efx_nic *efx)
587{
588 struct efx_link_state *link_state = &efx->link_state;
589 int count, link_up_count = 0;
590 bool link_up;
591
592 for (count = 0; count < 40; count++) {
593 schedule_timeout_uninterruptible(HZ / 10);
594
595 if (efx->type->monitor != NULL) {
596 mutex_lock(&efx->mac_lock);
597 efx->type->monitor(efx);
598 mutex_unlock(&efx->mac_lock);
599 }
600
601 mutex_lock(&efx->mac_lock);
602 link_up = link_state->up;
603 if (link_up)
604 link_up = !efx->type->check_mac_fault(efx);
605 mutex_unlock(&efx->mac_lock);
606
607 if (link_up) {
608 if (++link_up_count == 2)
609 return 0;
610 } else {
611 link_up_count = 0;
612 }
613 }
614
615 return -ETIMEDOUT;
616}
617
618static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
619 unsigned int loopback_modes)
620{
621 enum efx_loopback_mode mode;
622 struct efx_loopback_state *state;
623 struct efx_channel *channel =
624 efx_get_channel(efx, efx->tx_channel_offset);
625 struct efx_tx_queue *tx_queue;
626 int rc = 0;
627
628 /* Set the port loopback_selftest member. From this point on
629 * all received packets will be dropped. Mark the state as
630 * "flushing" so all inflight packets are dropped */
631 state = kzalloc(sizeof(*state), GFP_KERNEL);
632 if (state == NULL)
633 return -ENOMEM;
634 BUG_ON(efx->loopback_selftest);
635 state->flush = true;
636 efx->loopback_selftest = state;
637
638 /* Test all supported loopback modes */
639 for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
640 if (!(loopback_modes & (1 << mode)))
641 continue;
642
643 /* Move the port into the specified loopback mode. */
644 state->flush = true;
645 mutex_lock(&efx->mac_lock);
646 efx->loopback_mode = mode;
647 rc = __efx_reconfigure_port(efx);
648 mutex_unlock(&efx->mac_lock);
649 if (rc) {
650 netif_err(efx, drv, efx->net_dev,
651 "unable to move into %s loopback\n",
652 LOOPBACK_MODE(efx));
653 goto out;
654 }
655
656 rc = efx_wait_for_link(efx);
657 if (rc) {
658 netif_err(efx, drv, efx->net_dev,
659 "loopback %s never came up\n",
660 LOOPBACK_MODE(efx));
661 goto out;
662 }
663
664 /* Test all enabled types of TX queue */
665 efx_for_each_channel_tx_queue(tx_queue, channel) {
666 state->offload_csum = (tx_queue->type &
667 EFX_TXQ_TYPE_OUTER_CSUM);
668 rc = efx_test_loopback(tx_queue,
669 &tests->loopback[mode]);
670 if (rc)
671 goto out;
672 }
673 }
674
675 out:
676 /* Remove the flush. The caller will remove the loopback setting */
677 state->flush = true;
678 efx->loopback_selftest = NULL;
679 wmb();
680 kfree(state);
681
682 if (rc == -EPERM)
683 rc = 0;
684
685 return rc;
686}
687
688/**************************************************************************
689 *
690 * Entry point
691 *
692 *************************************************************************/
693
694int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
695 unsigned flags)
696{
697 enum efx_loopback_mode loopback_mode = efx->loopback_mode;
698 int phy_mode = efx->phy_mode;
699 int rc_test = 0, rc_reset, rc;
700
701 efx_selftest_async_cancel(efx);
702
703 /* Online (i.e. non-disruptive) testing
704 * This checks interrupt generation, event delivery and PHY presence. */
705
706 rc = efx_test_phy_alive(efx, tests);
707 if (rc && !rc_test)
708 rc_test = rc;
709
710 rc = efx_test_nvram(efx, tests);
711 if (rc && !rc_test)
712 rc_test = rc;
713
714 rc = efx_test_interrupts(efx, tests);
715 if (rc && !rc_test)
716 rc_test = rc;
717
718 rc = efx_test_eventq_irq(efx, tests);
719 if (rc && !rc_test)
720 rc_test = rc;
721
722 if (rc_test)
723 return rc_test;
724
725 if (!(flags & ETH_TEST_FL_OFFLINE))
726 return efx_test_phy(efx, tests, flags);
727
728 /* Offline (i.e. disruptive) testing
729 * This checks MAC and PHY loopback on the specified port. */
730
731 /* Detach the device so the kernel doesn't transmit during the
732 * loopback test and the watchdog timeout doesn't fire.
733 */
734 efx_device_detach_sync(efx);
735
736 if (efx->type->test_chip) {
737 rc_reset = efx->type->test_chip(efx, tests);
738 if (rc_reset) {
739 netif_err(efx, hw, efx->net_dev,
740 "Unable to recover from chip test\n");
741 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
742 return rc_reset;
743 }
744
745 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
746 rc_test = -EIO;
747 }
748
749 /* Ensure that the phy is powered and out of loopback
750 * for the bist and loopback tests */
751 mutex_lock(&efx->mac_lock);
752 efx->phy_mode &= ~PHY_MODE_LOW_POWER;
753 efx->loopback_mode = LOOPBACK_NONE;
754 __efx_reconfigure_port(efx);
755 mutex_unlock(&efx->mac_lock);
756
757 rc = efx_test_phy(efx, tests, flags);
758 if (rc && !rc_test)
759 rc_test = rc;
760
761 rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
762 if (rc && !rc_test)
763 rc_test = rc;
764
765 /* restore the PHY to the previous state */
766 mutex_lock(&efx->mac_lock);
767 efx->phy_mode = phy_mode;
768 efx->loopback_mode = loopback_mode;
769 __efx_reconfigure_port(efx);
770 mutex_unlock(&efx->mac_lock);
771
772 efx_device_attach_if_not_resetting(efx);
773
774 return rc_test;
775}
776
777void efx_selftest_async_start(struct efx_nic *efx)
778{
779 struct efx_channel *channel;
780
781 efx_for_each_channel(channel, efx)
782 efx_nic_event_test_start(channel);
783 schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
784}
785
786void efx_selftest_async_cancel(struct efx_nic *efx)
787{
788 cancel_delayed_work_sync(&efx->selftest_work);
789}
790
791static void efx_selftest_async_work(struct work_struct *data)
792{
793 struct efx_nic *efx = container_of(data, struct efx_nic,
794 selftest_work.work);
795 struct efx_channel *channel;
796 int cpu;
797
798 efx_for_each_channel(channel, efx) {
799 cpu = efx_nic_event_test_irq_cpu(channel);
800 if (cpu < 0)
801 netif_err(efx, ifup, efx->net_dev,
802 "channel %d failed to trigger an interrupt\n",
803 channel->channel);
804 else
805 netif_dbg(efx, ifup, efx->net_dev,
806 "channel %d triggered interrupt on CPU %d\n",
807 channel->channel, cpu);
808 }
809}
810
811void efx_selftest_async_init(struct efx_nic *efx)
812{
813 INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
814}
1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2006-2012 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/netdevice.h>
12#include <linux/module.h>
13#include <linux/delay.h>
14#include <linux/kernel_stat.h>
15#include <linux/pci.h>
16#include <linux/ethtool.h>
17#include <linux/ip.h>
18#include <linux/in.h>
19#include <linux/udp.h>
20#include <linux/rtnetlink.h>
21#include <linux/slab.h>
22#include "net_driver.h"
23#include "efx.h"
24#include "nic.h"
25#include "selftest.h"
26#include "workarounds.h"
27
28/* IRQ latency can be enormous because:
29 * - All IRQs may be disabled on a CPU for a *long* time by e.g. a
30 * slow serial console or an old IDE driver doing error recovery
31 * - The PREEMPT_RT patches mostly deal with this, but also allow a
32 * tasklet or normal task to be given higher priority than our IRQ
33 * threads
34 * Try to avoid blaming the hardware for this.
35 */
36#define IRQ_TIMEOUT HZ
37
38/*
39 * Loopback test packet structure
40 *
41 * The self-test should stress every RSS vector, and unfortunately
42 * Falcon only performs RSS on TCP/UDP packets.
43 */
44struct efx_loopback_payload {
45 struct ethhdr header;
46 struct iphdr ip;
47 struct udphdr udp;
48 __be16 iteration;
49 char msg[64];
50} __packed;
51
52/* Loopback test source MAC address */
53static const u8 payload_source[ETH_ALEN] __aligned(2) = {
54 0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
55};
56
57static const char payload_msg[] =
58 "Hello world! This is an Efx loopback test in progress!";
59
60/* Interrupt mode names */
61static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
62static const char *const efx_interrupt_mode_names[] = {
63 [EFX_INT_MODE_MSIX] = "MSI-X",
64 [EFX_INT_MODE_MSI] = "MSI",
65 [EFX_INT_MODE_LEGACY] = "legacy",
66};
67#define INT_MODE(efx) \
68 STRING_TABLE_LOOKUP(efx->interrupt_mode, efx_interrupt_mode)
69
70/**
71 * efx_loopback_state - persistent state during a loopback selftest
72 * @flush: Drop all packets in efx_loopback_rx_packet
73 * @packet_count: Number of packets being used in this test
74 * @skbs: An array of skbs transmitted
75 * @offload_csum: Checksums are being offloaded
76 * @rx_good: RX good packet count
77 * @rx_bad: RX bad packet count
78 * @payload: Payload used in tests
79 */
80struct efx_loopback_state {
81 bool flush;
82 int packet_count;
83 struct sk_buff **skbs;
84 bool offload_csum;
85 atomic_t rx_good;
86 atomic_t rx_bad;
87 struct efx_loopback_payload payload;
88};
89
90/* How long to wait for all the packets to arrive (in ms) */
91#define LOOPBACK_TIMEOUT_MS 1000
92
93/**************************************************************************
94 *
95 * MII, NVRAM and register tests
96 *
97 **************************************************************************/
98
99static int efx_test_phy_alive(struct efx_nic *efx, struct efx_self_tests *tests)
100{
101 int rc = 0;
102
103 if (efx->phy_op->test_alive) {
104 rc = efx->phy_op->test_alive(efx);
105 tests->phy_alive = rc ? -1 : 1;
106 }
107
108 return rc;
109}
110
111static int efx_test_nvram(struct efx_nic *efx, struct efx_self_tests *tests)
112{
113 int rc = 0;
114
115 if (efx->type->test_nvram) {
116 rc = efx->type->test_nvram(efx);
117 if (rc == -EPERM)
118 rc = 0;
119 else
120 tests->nvram = rc ? -1 : 1;
121 }
122
123 return rc;
124}
125
126/**************************************************************************
127 *
128 * Interrupt and event queue testing
129 *
130 **************************************************************************/
131
132/* Test generation and receipt of interrupts */
133static int efx_test_interrupts(struct efx_nic *efx,
134 struct efx_self_tests *tests)
135{
136 unsigned long timeout, wait;
137 int cpu;
138
139 netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
140 tests->interrupt = -1;
141
142 efx_nic_irq_test_start(efx);
143 timeout = jiffies + IRQ_TIMEOUT;
144 wait = 1;
145
146 /* Wait for arrival of test interrupt. */
147 netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
148 do {
149 schedule_timeout_uninterruptible(wait);
150 cpu = efx_nic_irq_test_irq_cpu(efx);
151 if (cpu >= 0)
152 goto success;
153 wait *= 2;
154 } while (time_before(jiffies, timeout));
155
156 netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
157 return -ETIMEDOUT;
158
159 success:
160 netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
161 INT_MODE(efx), cpu);
162 tests->interrupt = 1;
163 return 0;
164}
165
166/* Test generation and receipt of interrupting events */
167static int efx_test_eventq_irq(struct efx_nic *efx,
168 struct efx_self_tests *tests)
169{
170 struct efx_channel *channel;
171 unsigned int read_ptr[EFX_MAX_CHANNELS];
172 unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
173 unsigned long timeout, wait;
174
175 BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
176
177 efx_for_each_channel(channel, efx) {
178 read_ptr[channel->channel] = channel->eventq_read_ptr;
179 set_bit(channel->channel, &dma_pend);
180 set_bit(channel->channel, &int_pend);
181 efx_nic_event_test_start(channel);
182 }
183
184 timeout = jiffies + IRQ_TIMEOUT;
185 wait = 1;
186
187 /* Wait for arrival of interrupts. NAPI processing may or may
188 * not complete in time, but we can cope in any case.
189 */
190 do {
191 schedule_timeout_uninterruptible(wait);
192
193 efx_for_each_channel(channel, efx) {
194 efx_stop_eventq(channel);
195 if (channel->eventq_read_ptr !=
196 read_ptr[channel->channel]) {
197 set_bit(channel->channel, &napi_ran);
198 clear_bit(channel->channel, &dma_pend);
199 clear_bit(channel->channel, &int_pend);
200 } else {
201 if (efx_nic_event_present(channel))
202 clear_bit(channel->channel, &dma_pend);
203 if (efx_nic_event_test_irq_cpu(channel) >= 0)
204 clear_bit(channel->channel, &int_pend);
205 }
206 efx_start_eventq(channel);
207 }
208
209 wait *= 2;
210 } while ((dma_pend || int_pend) && time_before(jiffies, timeout));
211
212 efx_for_each_channel(channel, efx) {
213 bool dma_seen = !test_bit(channel->channel, &dma_pend);
214 bool int_seen = !test_bit(channel->channel, &int_pend);
215
216 tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
217 tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
218
219 if (dma_seen && int_seen) {
220 netif_dbg(efx, drv, efx->net_dev,
221 "channel %d event queue passed (with%s NAPI)\n",
222 channel->channel,
223 test_bit(channel->channel, &napi_ran) ?
224 "" : "out");
225 } else {
226 /* Report failure and whether either interrupt or DMA
227 * worked
228 */
229 netif_err(efx, drv, efx->net_dev,
230 "channel %d timed out waiting for event queue\n",
231 channel->channel);
232 if (int_seen)
233 netif_err(efx, drv, efx->net_dev,
234 "channel %d saw interrupt "
235 "during event queue test\n",
236 channel->channel);
237 if (dma_seen)
238 netif_err(efx, drv, efx->net_dev,
239 "channel %d event was generated, but "
240 "failed to trigger an interrupt\n",
241 channel->channel);
242 }
243 }
244
245 return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
246}
247
248static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
249 unsigned flags)
250{
251 int rc;
252
253 if (!efx->phy_op->run_tests)
254 return 0;
255
256 mutex_lock(&efx->mac_lock);
257 rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
258 mutex_unlock(&efx->mac_lock);
259 if (rc == -EPERM)
260 rc = 0;
261 else
262 netif_info(efx, drv, efx->net_dev,
263 "%s phy selftest\n", rc ? "Failed" : "Passed");
264
265 return rc;
266}
267
268/**************************************************************************
269 *
270 * Loopback testing
271 * NB Only one loopback test can be executing concurrently.
272 *
273 **************************************************************************/
274
275/* Loopback test RX callback
276 * This is called for each received packet during loopback testing.
277 */
278void efx_loopback_rx_packet(struct efx_nic *efx,
279 const char *buf_ptr, int pkt_len)
280{
281 struct efx_loopback_state *state = efx->loopback_selftest;
282 struct efx_loopback_payload *received;
283 struct efx_loopback_payload *payload;
284
285 BUG_ON(!buf_ptr);
286
287 /* If we are just flushing, then drop the packet */
288 if ((state == NULL) || state->flush)
289 return;
290
291 payload = &state->payload;
292
293 received = (struct efx_loopback_payload *) buf_ptr;
294 received->ip.saddr = payload->ip.saddr;
295 if (state->offload_csum)
296 received->ip.check = payload->ip.check;
297
298 /* Check that header exists */
299 if (pkt_len < sizeof(received->header)) {
300 netif_err(efx, drv, efx->net_dev,
301 "saw runt RX packet (length %d) in %s loopback "
302 "test\n", pkt_len, LOOPBACK_MODE(efx));
303 goto err;
304 }
305
306 /* Check that the ethernet header exists */
307 if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
308 netif_err(efx, drv, efx->net_dev,
309 "saw non-loopback RX packet in %s loopback test\n",
310 LOOPBACK_MODE(efx));
311 goto err;
312 }
313
314 /* Check packet length */
315 if (pkt_len != sizeof(*payload)) {
316 netif_err(efx, drv, efx->net_dev,
317 "saw incorrect RX packet length %d (wanted %d) in "
318 "%s loopback test\n", pkt_len, (int)sizeof(*payload),
319 LOOPBACK_MODE(efx));
320 goto err;
321 }
322
323 /* Check that IP header matches */
324 if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
325 netif_err(efx, drv, efx->net_dev,
326 "saw corrupted IP header in %s loopback test\n",
327 LOOPBACK_MODE(efx));
328 goto err;
329 }
330
331 /* Check that msg and padding matches */
332 if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
333 netif_err(efx, drv, efx->net_dev,
334 "saw corrupted RX packet in %s loopback test\n",
335 LOOPBACK_MODE(efx));
336 goto err;
337 }
338
339 /* Check that iteration matches */
340 if (received->iteration != payload->iteration) {
341 netif_err(efx, drv, efx->net_dev,
342 "saw RX packet from iteration %d (wanted %d) in "
343 "%s loopback test\n", ntohs(received->iteration),
344 ntohs(payload->iteration), LOOPBACK_MODE(efx));
345 goto err;
346 }
347
348 /* Increase correct RX count */
349 netif_vdbg(efx, drv, efx->net_dev,
350 "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
351
352 atomic_inc(&state->rx_good);
353 return;
354
355 err:
356#ifdef DEBUG
357 if (atomic_read(&state->rx_bad) == 0) {
358 netif_err(efx, drv, efx->net_dev, "received packet:\n");
359 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
360 buf_ptr, pkt_len, 0);
361 netif_err(efx, drv, efx->net_dev, "expected packet:\n");
362 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
363 &state->payload, sizeof(state->payload), 0);
364 }
365#endif
366 atomic_inc(&state->rx_bad);
367}
368
369/* Initialise an efx_selftest_state for a new iteration */
370static void efx_iterate_state(struct efx_nic *efx)
371{
372 struct efx_loopback_state *state = efx->loopback_selftest;
373 struct net_device *net_dev = efx->net_dev;
374 struct efx_loopback_payload *payload = &state->payload;
375
376 /* Initialise the layerII header */
377 ether_addr_copy((u8 *)&payload->header.h_dest, net_dev->dev_addr);
378 ether_addr_copy((u8 *)&payload->header.h_source, payload_source);
379 payload->header.h_proto = htons(ETH_P_IP);
380
381 /* saddr set later and used as incrementing count */
382 payload->ip.daddr = htonl(INADDR_LOOPBACK);
383 payload->ip.ihl = 5;
384 payload->ip.check = (__force __sum16) htons(0xdead);
385 payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
386 payload->ip.version = IPVERSION;
387 payload->ip.protocol = IPPROTO_UDP;
388
389 /* Initialise udp header */
390 payload->udp.source = 0;
391 payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
392 sizeof(struct iphdr));
393 payload->udp.check = 0; /* checksum ignored */
394
395 /* Fill out payload */
396 payload->iteration = htons(ntohs(payload->iteration) + 1);
397 memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
398
399 /* Fill out remaining state members */
400 atomic_set(&state->rx_good, 0);
401 atomic_set(&state->rx_bad, 0);
402 smp_wmb();
403}
404
405static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
406{
407 struct efx_nic *efx = tx_queue->efx;
408 struct efx_loopback_state *state = efx->loopback_selftest;
409 struct efx_loopback_payload *payload;
410 struct sk_buff *skb;
411 int i;
412 netdev_tx_t rc;
413
414 /* Transmit N copies of buffer */
415 for (i = 0; i < state->packet_count; i++) {
416 /* Allocate an skb, holding an extra reference for
417 * transmit completion counting */
418 skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
419 if (!skb)
420 return -ENOMEM;
421 state->skbs[i] = skb;
422 skb_get(skb);
423
424 /* Copy the payload in, incrementing the source address to
425 * exercise the rss vectors */
426 payload = ((struct efx_loopback_payload *)
427 skb_put(skb, sizeof(state->payload)));
428 memcpy(payload, &state->payload, sizeof(state->payload));
429 payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
430
431 /* Ensure everything we've written is visible to the
432 * interrupt handler. */
433 smp_wmb();
434
435 netif_tx_lock_bh(efx->net_dev);
436 rc = efx_enqueue_skb(tx_queue, skb);
437 netif_tx_unlock_bh(efx->net_dev);
438
439 if (rc != NETDEV_TX_OK) {
440 netif_err(efx, drv, efx->net_dev,
441 "TX queue %d could not transmit packet %d of "
442 "%d in %s loopback test\n", tx_queue->queue,
443 i + 1, state->packet_count,
444 LOOPBACK_MODE(efx));
445
446 /* Defer cleaning up the other skbs for the caller */
447 kfree_skb(skb);
448 return -EPIPE;
449 }
450 }
451
452 return 0;
453}
454
455static int efx_poll_loopback(struct efx_nic *efx)
456{
457 struct efx_loopback_state *state = efx->loopback_selftest;
458
459 return atomic_read(&state->rx_good) == state->packet_count;
460}
461
462static int efx_end_loopback(struct efx_tx_queue *tx_queue,
463 struct efx_loopback_self_tests *lb_tests)
464{
465 struct efx_nic *efx = tx_queue->efx;
466 struct efx_loopback_state *state = efx->loopback_selftest;
467 struct sk_buff *skb;
468 int tx_done = 0, rx_good, rx_bad;
469 int i, rc = 0;
470
471 netif_tx_lock_bh(efx->net_dev);
472
473 /* Count the number of tx completions, and decrement the refcnt. Any
474 * skbs not already completed will be free'd when the queue is flushed */
475 for (i = 0; i < state->packet_count; i++) {
476 skb = state->skbs[i];
477 if (skb && !skb_shared(skb))
478 ++tx_done;
479 dev_kfree_skb(skb);
480 }
481
482 netif_tx_unlock_bh(efx->net_dev);
483
484 /* Check TX completion and received packet counts */
485 rx_good = atomic_read(&state->rx_good);
486 rx_bad = atomic_read(&state->rx_bad);
487 if (tx_done != state->packet_count) {
488 /* Don't free the skbs; they will be picked up on TX
489 * overflow or channel teardown.
490 */
491 netif_err(efx, drv, efx->net_dev,
492 "TX queue %d saw only %d out of an expected %d "
493 "TX completion events in %s loopback test\n",
494 tx_queue->queue, tx_done, state->packet_count,
495 LOOPBACK_MODE(efx));
496 rc = -ETIMEDOUT;
497 /* Allow to fall through so we see the RX errors as well */
498 }
499
500 /* We may always be up to a flush away from our desired packet total */
501 if (rx_good != state->packet_count) {
502 netif_dbg(efx, drv, efx->net_dev,
503 "TX queue %d saw only %d out of an expected %d "
504 "received packets in %s loopback test\n",
505 tx_queue->queue, rx_good, state->packet_count,
506 LOOPBACK_MODE(efx));
507 rc = -ETIMEDOUT;
508 /* Fall through */
509 }
510
511 /* Update loopback test structure */
512 lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
513 lb_tests->tx_done[tx_queue->queue] += tx_done;
514 lb_tests->rx_good += rx_good;
515 lb_tests->rx_bad += rx_bad;
516
517 return rc;
518}
519
520static int
521efx_test_loopback(struct efx_tx_queue *tx_queue,
522 struct efx_loopback_self_tests *lb_tests)
523{
524 struct efx_nic *efx = tx_queue->efx;
525 struct efx_loopback_state *state = efx->loopback_selftest;
526 int i, begin_rc, end_rc;
527
528 for (i = 0; i < 3; i++) {
529 /* Determine how many packets to send */
530 state->packet_count = efx->txq_entries / 3;
531 state->packet_count = min(1 << (i << 2), state->packet_count);
532 state->skbs = kcalloc(state->packet_count,
533 sizeof(state->skbs[0]), GFP_KERNEL);
534 if (!state->skbs)
535 return -ENOMEM;
536 state->flush = false;
537
538 netif_dbg(efx, drv, efx->net_dev,
539 "TX queue %d testing %s loopback with %d packets\n",
540 tx_queue->queue, LOOPBACK_MODE(efx),
541 state->packet_count);
542
543 efx_iterate_state(efx);
544 begin_rc = efx_begin_loopback(tx_queue);
545
546 /* This will normally complete very quickly, but be
547 * prepared to wait much longer. */
548 msleep(1);
549 if (!efx_poll_loopback(efx)) {
550 msleep(LOOPBACK_TIMEOUT_MS);
551 efx_poll_loopback(efx);
552 }
553
554 end_rc = efx_end_loopback(tx_queue, lb_tests);
555 kfree(state->skbs);
556
557 if (begin_rc || end_rc) {
558 /* Wait a while to ensure there are no packets
559 * floating around after a failure. */
560 schedule_timeout_uninterruptible(HZ / 10);
561 return begin_rc ? begin_rc : end_rc;
562 }
563 }
564
565 netif_dbg(efx, drv, efx->net_dev,
566 "TX queue %d passed %s loopback test with a burst length "
567 "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
568 state->packet_count);
569
570 return 0;
571}
572
573/* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
574 * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
575 * to delay and retry. Therefore, it's safer to just poll directly. Wait
576 * for link up and any faults to dissipate. */
577static int efx_wait_for_link(struct efx_nic *efx)
578{
579 struct efx_link_state *link_state = &efx->link_state;
580 int count, link_up_count = 0;
581 bool link_up;
582
583 for (count = 0; count < 40; count++) {
584 schedule_timeout_uninterruptible(HZ / 10);
585
586 if (efx->type->monitor != NULL) {
587 mutex_lock(&efx->mac_lock);
588 efx->type->monitor(efx);
589 mutex_unlock(&efx->mac_lock);
590 }
591
592 mutex_lock(&efx->mac_lock);
593 link_up = link_state->up;
594 if (link_up)
595 link_up = !efx->type->check_mac_fault(efx);
596 mutex_unlock(&efx->mac_lock);
597
598 if (link_up) {
599 if (++link_up_count == 2)
600 return 0;
601 } else {
602 link_up_count = 0;
603 }
604 }
605
606 return -ETIMEDOUT;
607}
608
609static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
610 unsigned int loopback_modes)
611{
612 enum efx_loopback_mode mode;
613 struct efx_loopback_state *state;
614 struct efx_channel *channel =
615 efx_get_channel(efx, efx->tx_channel_offset);
616 struct efx_tx_queue *tx_queue;
617 int rc = 0;
618
619 /* Set the port loopback_selftest member. From this point on
620 * all received packets will be dropped. Mark the state as
621 * "flushing" so all inflight packets are dropped */
622 state = kzalloc(sizeof(*state), GFP_KERNEL);
623 if (state == NULL)
624 return -ENOMEM;
625 BUG_ON(efx->loopback_selftest);
626 state->flush = true;
627 efx->loopback_selftest = state;
628
629 /* Test all supported loopback modes */
630 for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
631 if (!(loopback_modes & (1 << mode)))
632 continue;
633
634 /* Move the port into the specified loopback mode. */
635 state->flush = true;
636 mutex_lock(&efx->mac_lock);
637 efx->loopback_mode = mode;
638 rc = __efx_reconfigure_port(efx);
639 mutex_unlock(&efx->mac_lock);
640 if (rc) {
641 netif_err(efx, drv, efx->net_dev,
642 "unable to move into %s loopback\n",
643 LOOPBACK_MODE(efx));
644 goto out;
645 }
646
647 rc = efx_wait_for_link(efx);
648 if (rc) {
649 netif_err(efx, drv, efx->net_dev,
650 "loopback %s never came up\n",
651 LOOPBACK_MODE(efx));
652 goto out;
653 }
654
655 /* Test all enabled types of TX queue */
656 efx_for_each_channel_tx_queue(tx_queue, channel) {
657 state->offload_csum = (tx_queue->queue &
658 EFX_TXQ_TYPE_OFFLOAD);
659 rc = efx_test_loopback(tx_queue,
660 &tests->loopback[mode]);
661 if (rc)
662 goto out;
663 }
664 }
665
666 out:
667 /* Remove the flush. The caller will remove the loopback setting */
668 state->flush = true;
669 efx->loopback_selftest = NULL;
670 wmb();
671 kfree(state);
672
673 if (rc == -EPERM)
674 rc = 0;
675
676 return rc;
677}
678
679/**************************************************************************
680 *
681 * Entry point
682 *
683 *************************************************************************/
684
685int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
686 unsigned flags)
687{
688 enum efx_loopback_mode loopback_mode = efx->loopback_mode;
689 int phy_mode = efx->phy_mode;
690 int rc_test = 0, rc_reset, rc;
691
692 efx_selftest_async_cancel(efx);
693
694 /* Online (i.e. non-disruptive) testing
695 * This checks interrupt generation, event delivery and PHY presence. */
696
697 rc = efx_test_phy_alive(efx, tests);
698 if (rc && !rc_test)
699 rc_test = rc;
700
701 rc = efx_test_nvram(efx, tests);
702 if (rc && !rc_test)
703 rc_test = rc;
704
705 rc = efx_test_interrupts(efx, tests);
706 if (rc && !rc_test)
707 rc_test = rc;
708
709 rc = efx_test_eventq_irq(efx, tests);
710 if (rc && !rc_test)
711 rc_test = rc;
712
713 if (rc_test)
714 return rc_test;
715
716 if (!(flags & ETH_TEST_FL_OFFLINE))
717 return efx_test_phy(efx, tests, flags);
718
719 /* Offline (i.e. disruptive) testing
720 * This checks MAC and PHY loopback on the specified port. */
721
722 /* Detach the device so the kernel doesn't transmit during the
723 * loopback test and the watchdog timeout doesn't fire.
724 */
725 efx_device_detach_sync(efx);
726
727 if (efx->type->test_chip) {
728 rc_reset = efx->type->test_chip(efx, tests);
729 if (rc_reset) {
730 netif_err(efx, hw, efx->net_dev,
731 "Unable to recover from chip test\n");
732 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
733 return rc_reset;
734 }
735
736 if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
737 rc_test = -EIO;
738 }
739
740 /* Ensure that the phy is powered and out of loopback
741 * for the bist and loopback tests */
742 mutex_lock(&efx->mac_lock);
743 efx->phy_mode &= ~PHY_MODE_LOW_POWER;
744 efx->loopback_mode = LOOPBACK_NONE;
745 __efx_reconfigure_port(efx);
746 mutex_unlock(&efx->mac_lock);
747
748 rc = efx_test_phy(efx, tests, flags);
749 if (rc && !rc_test)
750 rc_test = rc;
751
752 rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
753 if (rc && !rc_test)
754 rc_test = rc;
755
756 /* restore the PHY to the previous state */
757 mutex_lock(&efx->mac_lock);
758 efx->phy_mode = phy_mode;
759 efx->loopback_mode = loopback_mode;
760 __efx_reconfigure_port(efx);
761 mutex_unlock(&efx->mac_lock);
762
763 netif_device_attach(efx->net_dev);
764
765 return rc_test;
766}
767
768void efx_selftest_async_start(struct efx_nic *efx)
769{
770 struct efx_channel *channel;
771
772 efx_for_each_channel(channel, efx)
773 efx_nic_event_test_start(channel);
774 schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
775}
776
777void efx_selftest_async_cancel(struct efx_nic *efx)
778{
779 cancel_delayed_work_sync(&efx->selftest_work);
780}
781
782void efx_selftest_async_work(struct work_struct *data)
783{
784 struct efx_nic *efx = container_of(data, struct efx_nic,
785 selftest_work.work);
786 struct efx_channel *channel;
787 int cpu;
788
789 efx_for_each_channel(channel, efx) {
790 cpu = efx_nic_event_test_irq_cpu(channel);
791 if (cpu < 0)
792 netif_err(efx, ifup, efx->net_dev,
793 "channel %d failed to trigger an interrupt\n",
794 channel->channel);
795 else
796 netif_dbg(efx, ifup, efx->net_dev,
797 "channel %d triggered interrupt on CPU %d\n",
798 channel->channel, cpu);
799 }
800}