xref: /linux/drivers/net/ethernet/sfc/selftest.c (revision cc11f372e9371ec3a3dad02396dbe0a55eec0b8f)
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  */
44 struct efx_loopback_payload {
45 	struct ethhdr header;
46 	struct iphdr ip;
47 	struct udphdr udp;
48 	__be16 iteration;
49 	const char msg[64];
50 } __packed;
51 
52 /* Loopback test source MAC address */
53 static const unsigned char payload_source[ETH_ALEN] = {
54 	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
55 };
56 
57 static const char payload_msg[] =
58 	"Hello world! This is an Efx loopback test in progress!";
59 
60 /* Interrupt mode names */
61 static const unsigned int efx_interrupt_mode_max = EFX_INT_MODE_MAX;
62 static 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  */
80 struct 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 
99 static 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 
111 static 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 		tests->nvram = rc ? -1 : 1;
118 	}
119 
120 	return rc;
121 }
122 
123 /**************************************************************************
124  *
125  * Interrupt and event queue testing
126  *
127  **************************************************************************/
128 
129 /* Test generation and receipt of interrupts */
130 static int efx_test_interrupts(struct efx_nic *efx,
131 			       struct efx_self_tests *tests)
132 {
133 	unsigned long timeout, wait;
134 	int cpu;
135 
136 	netif_dbg(efx, drv, efx->net_dev, "testing interrupts\n");
137 	tests->interrupt = -1;
138 
139 	efx_nic_irq_test_start(efx);
140 	timeout = jiffies + IRQ_TIMEOUT;
141 	wait = 1;
142 
143 	/* Wait for arrival of test interrupt. */
144 	netif_dbg(efx, drv, efx->net_dev, "waiting for test interrupt\n");
145 	do {
146 		schedule_timeout_uninterruptible(wait);
147 		cpu = efx_nic_irq_test_irq_cpu(efx);
148 		if (cpu >= 0)
149 			goto success;
150 		wait *= 2;
151 	} while (time_before(jiffies, timeout));
152 
153 	netif_err(efx, drv, efx->net_dev, "timed out waiting for interrupt\n");
154 	return -ETIMEDOUT;
155 
156  success:
157 	netif_dbg(efx, drv, efx->net_dev, "%s test interrupt seen on CPU%d\n",
158 		  INT_MODE(efx), cpu);
159 	tests->interrupt = 1;
160 	return 0;
161 }
162 
163 /* Test generation and receipt of interrupting events */
164 static int efx_test_eventq_irq(struct efx_nic *efx,
165 			       struct efx_self_tests *tests)
166 {
167 	struct efx_channel *channel;
168 	unsigned int read_ptr[EFX_MAX_CHANNELS];
169 	unsigned long napi_ran = 0, dma_pend = 0, int_pend = 0;
170 	unsigned long timeout, wait;
171 
172 	BUILD_BUG_ON(EFX_MAX_CHANNELS > BITS_PER_LONG);
173 
174 	efx_for_each_channel(channel, efx) {
175 		read_ptr[channel->channel] = channel->eventq_read_ptr;
176 		set_bit(channel->channel, &dma_pend);
177 		set_bit(channel->channel, &int_pend);
178 		efx_nic_event_test_start(channel);
179 	}
180 
181 	timeout = jiffies + IRQ_TIMEOUT;
182 	wait = 1;
183 
184 	/* Wait for arrival of interrupts.  NAPI processing may or may
185 	 * not complete in time, but we can cope in any case.
186 	 */
187 	do {
188 		schedule_timeout_uninterruptible(wait);
189 
190 		efx_for_each_channel(channel, efx) {
191 			napi_disable(&channel->napi_str);
192 			if (channel->eventq_read_ptr !=
193 			    read_ptr[channel->channel]) {
194 				set_bit(channel->channel, &napi_ran);
195 				clear_bit(channel->channel, &dma_pend);
196 				clear_bit(channel->channel, &int_pend);
197 			} else {
198 				if (efx_nic_event_present(channel))
199 					clear_bit(channel->channel, &dma_pend);
200 				if (efx_nic_event_test_irq_cpu(channel) >= 0)
201 					clear_bit(channel->channel, &int_pend);
202 			}
203 			napi_enable(&channel->napi_str);
204 			efx_nic_eventq_read_ack(channel);
205 		}
206 
207 		wait *= 2;
208 	} while ((dma_pend || int_pend) && time_before(jiffies, timeout));
209 
210 	efx_for_each_channel(channel, efx) {
211 		bool dma_seen = !test_bit(channel->channel, &dma_pend);
212 		bool int_seen = !test_bit(channel->channel, &int_pend);
213 
214 		tests->eventq_dma[channel->channel] = dma_seen ? 1 : -1;
215 		tests->eventq_int[channel->channel] = int_seen ? 1 : -1;
216 
217 		if (dma_seen && int_seen) {
218 			netif_dbg(efx, drv, efx->net_dev,
219 				  "channel %d event queue passed (with%s NAPI)\n",
220 				  channel->channel,
221 				  test_bit(channel->channel, &napi_ran) ?
222 				  "" : "out");
223 		} else {
224 			/* Report failure and whether either interrupt or DMA
225 			 * worked
226 			 */
227 			netif_err(efx, drv, efx->net_dev,
228 				  "channel %d timed out waiting for event queue\n",
229 				  channel->channel);
230 			if (int_seen)
231 				netif_err(efx, drv, efx->net_dev,
232 					  "channel %d saw interrupt "
233 					  "during event queue test\n",
234 					  channel->channel);
235 			if (dma_seen)
236 				netif_err(efx, drv, efx->net_dev,
237 					  "channel %d event was generated, but "
238 					  "failed to trigger an interrupt\n",
239 					  channel->channel);
240 		}
241 	}
242 
243 	return (dma_pend || int_pend) ? -ETIMEDOUT : 0;
244 }
245 
246 static int efx_test_phy(struct efx_nic *efx, struct efx_self_tests *tests,
247 			unsigned flags)
248 {
249 	int rc;
250 
251 	if (!efx->phy_op->run_tests)
252 		return 0;
253 
254 	mutex_lock(&efx->mac_lock);
255 	rc = efx->phy_op->run_tests(efx, tests->phy_ext, flags);
256 	mutex_unlock(&efx->mac_lock);
257 	return rc;
258 }
259 
260 /**************************************************************************
261  *
262  * Loopback testing
263  * NB Only one loopback test can be executing concurrently.
264  *
265  **************************************************************************/
266 
267 /* Loopback test RX callback
268  * This is called for each received packet during loopback testing.
269  */
270 void efx_loopback_rx_packet(struct efx_nic *efx,
271 			    const char *buf_ptr, int pkt_len)
272 {
273 	struct efx_loopback_state *state = efx->loopback_selftest;
274 	struct efx_loopback_payload *received;
275 	struct efx_loopback_payload *payload;
276 
277 	BUG_ON(!buf_ptr);
278 
279 	/* If we are just flushing, then drop the packet */
280 	if ((state == NULL) || state->flush)
281 		return;
282 
283 	payload = &state->payload;
284 
285 	received = (struct efx_loopback_payload *) buf_ptr;
286 	received->ip.saddr = payload->ip.saddr;
287 	if (state->offload_csum)
288 		received->ip.check = payload->ip.check;
289 
290 	/* Check that header exists */
291 	if (pkt_len < sizeof(received->header)) {
292 		netif_err(efx, drv, efx->net_dev,
293 			  "saw runt RX packet (length %d) in %s loopback "
294 			  "test\n", pkt_len, LOOPBACK_MODE(efx));
295 		goto err;
296 	}
297 
298 	/* Check that the ethernet header exists */
299 	if (memcmp(&received->header, &payload->header, ETH_HLEN) != 0) {
300 		netif_err(efx, drv, efx->net_dev,
301 			  "saw non-loopback RX packet in %s loopback test\n",
302 			  LOOPBACK_MODE(efx));
303 		goto err;
304 	}
305 
306 	/* Check packet length */
307 	if (pkt_len != sizeof(*payload)) {
308 		netif_err(efx, drv, efx->net_dev,
309 			  "saw incorrect RX packet length %d (wanted %d) in "
310 			  "%s loopback test\n", pkt_len, (int)sizeof(*payload),
311 			  LOOPBACK_MODE(efx));
312 		goto err;
313 	}
314 
315 	/* Check that IP header matches */
316 	if (memcmp(&received->ip, &payload->ip, sizeof(payload->ip)) != 0) {
317 		netif_err(efx, drv, efx->net_dev,
318 			  "saw corrupted IP header in %s loopback test\n",
319 			  LOOPBACK_MODE(efx));
320 		goto err;
321 	}
322 
323 	/* Check that msg and padding matches */
324 	if (memcmp(&received->msg, &payload->msg, sizeof(received->msg)) != 0) {
325 		netif_err(efx, drv, efx->net_dev,
326 			  "saw corrupted RX packet in %s loopback test\n",
327 			  LOOPBACK_MODE(efx));
328 		goto err;
329 	}
330 
331 	/* Check that iteration matches */
332 	if (received->iteration != payload->iteration) {
333 		netif_err(efx, drv, efx->net_dev,
334 			  "saw RX packet from iteration %d (wanted %d) in "
335 			  "%s loopback test\n", ntohs(received->iteration),
336 			  ntohs(payload->iteration), LOOPBACK_MODE(efx));
337 		goto err;
338 	}
339 
340 	/* Increase correct RX count */
341 	netif_vdbg(efx, drv, efx->net_dev,
342 		   "got loopback RX in %s loopback test\n", LOOPBACK_MODE(efx));
343 
344 	atomic_inc(&state->rx_good);
345 	return;
346 
347  err:
348 #ifdef DEBUG
349 	if (atomic_read(&state->rx_bad) == 0) {
350 		netif_err(efx, drv, efx->net_dev, "received packet:\n");
351 		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
352 			       buf_ptr, pkt_len, 0);
353 		netif_err(efx, drv, efx->net_dev, "expected packet:\n");
354 		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 0x10, 1,
355 			       &state->payload, sizeof(state->payload), 0);
356 	}
357 #endif
358 	atomic_inc(&state->rx_bad);
359 }
360 
361 /* Initialise an efx_selftest_state for a new iteration */
362 static void efx_iterate_state(struct efx_nic *efx)
363 {
364 	struct efx_loopback_state *state = efx->loopback_selftest;
365 	struct net_device *net_dev = efx->net_dev;
366 	struct efx_loopback_payload *payload = &state->payload;
367 
368 	/* Initialise the layerII header */
369 	memcpy(&payload->header.h_dest, net_dev->dev_addr, ETH_ALEN);
370 	memcpy(&payload->header.h_source, &payload_source, ETH_ALEN);
371 	payload->header.h_proto = htons(ETH_P_IP);
372 
373 	/* saddr set later and used as incrementing count */
374 	payload->ip.daddr = htonl(INADDR_LOOPBACK);
375 	payload->ip.ihl = 5;
376 	payload->ip.check = (__force __sum16) htons(0xdead);
377 	payload->ip.tot_len = htons(sizeof(*payload) - sizeof(struct ethhdr));
378 	payload->ip.version = IPVERSION;
379 	payload->ip.protocol = IPPROTO_UDP;
380 
381 	/* Initialise udp header */
382 	payload->udp.source = 0;
383 	payload->udp.len = htons(sizeof(*payload) - sizeof(struct ethhdr) -
384 				 sizeof(struct iphdr));
385 	payload->udp.check = 0;	/* checksum ignored */
386 
387 	/* Fill out payload */
388 	payload->iteration = htons(ntohs(payload->iteration) + 1);
389 	memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
390 
391 	/* Fill out remaining state members */
392 	atomic_set(&state->rx_good, 0);
393 	atomic_set(&state->rx_bad, 0);
394 	smp_wmb();
395 }
396 
397 static int efx_begin_loopback(struct efx_tx_queue *tx_queue)
398 {
399 	struct efx_nic *efx = tx_queue->efx;
400 	struct efx_loopback_state *state = efx->loopback_selftest;
401 	struct efx_loopback_payload *payload;
402 	struct sk_buff *skb;
403 	int i;
404 	netdev_tx_t rc;
405 
406 	/* Transmit N copies of buffer */
407 	for (i = 0; i < state->packet_count; i++) {
408 		/* Allocate an skb, holding an extra reference for
409 		 * transmit completion counting */
410 		skb = alloc_skb(sizeof(state->payload), GFP_KERNEL);
411 		if (!skb)
412 			return -ENOMEM;
413 		state->skbs[i] = skb;
414 		skb_get(skb);
415 
416 		/* Copy the payload in, incrementing the source address to
417 		 * exercise the rss vectors */
418 		payload = ((struct efx_loopback_payload *)
419 			   skb_put(skb, sizeof(state->payload)));
420 		memcpy(payload, &state->payload, sizeof(state->payload));
421 		payload->ip.saddr = htonl(INADDR_LOOPBACK | (i << 2));
422 
423 		/* Ensure everything we've written is visible to the
424 		 * interrupt handler. */
425 		smp_wmb();
426 
427 		netif_tx_lock_bh(efx->net_dev);
428 		rc = efx_enqueue_skb(tx_queue, skb);
429 		netif_tx_unlock_bh(efx->net_dev);
430 
431 		if (rc != NETDEV_TX_OK) {
432 			netif_err(efx, drv, efx->net_dev,
433 				  "TX queue %d could not transmit packet %d of "
434 				  "%d in %s loopback test\n", tx_queue->queue,
435 				  i + 1, state->packet_count,
436 				  LOOPBACK_MODE(efx));
437 
438 			/* Defer cleaning up the other skbs for the caller */
439 			kfree_skb(skb);
440 			return -EPIPE;
441 		}
442 	}
443 
444 	return 0;
445 }
446 
447 static int efx_poll_loopback(struct efx_nic *efx)
448 {
449 	struct efx_loopback_state *state = efx->loopback_selftest;
450 
451 	return atomic_read(&state->rx_good) == state->packet_count;
452 }
453 
454 static int efx_end_loopback(struct efx_tx_queue *tx_queue,
455 			    struct efx_loopback_self_tests *lb_tests)
456 {
457 	struct efx_nic *efx = tx_queue->efx;
458 	struct efx_loopback_state *state = efx->loopback_selftest;
459 	struct sk_buff *skb;
460 	int tx_done = 0, rx_good, rx_bad;
461 	int i, rc = 0;
462 
463 	netif_tx_lock_bh(efx->net_dev);
464 
465 	/* Count the number of tx completions, and decrement the refcnt. Any
466 	 * skbs not already completed will be free'd when the queue is flushed */
467 	for (i = 0; i < state->packet_count; i++) {
468 		skb = state->skbs[i];
469 		if (skb && !skb_shared(skb))
470 			++tx_done;
471 		dev_kfree_skb(skb);
472 	}
473 
474 	netif_tx_unlock_bh(efx->net_dev);
475 
476 	/* Check TX completion and received packet counts */
477 	rx_good = atomic_read(&state->rx_good);
478 	rx_bad = atomic_read(&state->rx_bad);
479 	if (tx_done != state->packet_count) {
480 		/* Don't free the skbs; they will be picked up on TX
481 		 * overflow or channel teardown.
482 		 */
483 		netif_err(efx, drv, efx->net_dev,
484 			  "TX queue %d saw only %d out of an expected %d "
485 			  "TX completion events in %s loopback test\n",
486 			  tx_queue->queue, tx_done, state->packet_count,
487 			  LOOPBACK_MODE(efx));
488 		rc = -ETIMEDOUT;
489 		/* Allow to fall through so we see the RX errors as well */
490 	}
491 
492 	/* We may always be up to a flush away from our desired packet total */
493 	if (rx_good != state->packet_count) {
494 		netif_dbg(efx, drv, efx->net_dev,
495 			  "TX queue %d saw only %d out of an expected %d "
496 			  "received packets in %s loopback test\n",
497 			  tx_queue->queue, rx_good, state->packet_count,
498 			  LOOPBACK_MODE(efx));
499 		rc = -ETIMEDOUT;
500 		/* Fall through */
501 	}
502 
503 	/* Update loopback test structure */
504 	lb_tests->tx_sent[tx_queue->queue] += state->packet_count;
505 	lb_tests->tx_done[tx_queue->queue] += tx_done;
506 	lb_tests->rx_good += rx_good;
507 	lb_tests->rx_bad += rx_bad;
508 
509 	return rc;
510 }
511 
512 static int
513 efx_test_loopback(struct efx_tx_queue *tx_queue,
514 		  struct efx_loopback_self_tests *lb_tests)
515 {
516 	struct efx_nic *efx = tx_queue->efx;
517 	struct efx_loopback_state *state = efx->loopback_selftest;
518 	int i, begin_rc, end_rc;
519 
520 	for (i = 0; i < 3; i++) {
521 		/* Determine how many packets to send */
522 		state->packet_count = efx->txq_entries / 3;
523 		state->packet_count = min(1 << (i << 2), state->packet_count);
524 		state->skbs = kcalloc(state->packet_count,
525 				      sizeof(state->skbs[0]), GFP_KERNEL);
526 		if (!state->skbs)
527 			return -ENOMEM;
528 		state->flush = false;
529 
530 		netif_dbg(efx, drv, efx->net_dev,
531 			  "TX queue %d testing %s loopback with %d packets\n",
532 			  tx_queue->queue, LOOPBACK_MODE(efx),
533 			  state->packet_count);
534 
535 		efx_iterate_state(efx);
536 		begin_rc = efx_begin_loopback(tx_queue);
537 
538 		/* This will normally complete very quickly, but be
539 		 * prepared to wait much longer. */
540 		msleep(1);
541 		if (!efx_poll_loopback(efx)) {
542 			msleep(LOOPBACK_TIMEOUT_MS);
543 			efx_poll_loopback(efx);
544 		}
545 
546 		end_rc = efx_end_loopback(tx_queue, lb_tests);
547 		kfree(state->skbs);
548 
549 		if (begin_rc || end_rc) {
550 			/* Wait a while to ensure there are no packets
551 			 * floating around after a failure. */
552 			schedule_timeout_uninterruptible(HZ / 10);
553 			return begin_rc ? begin_rc : end_rc;
554 		}
555 	}
556 
557 	netif_dbg(efx, drv, efx->net_dev,
558 		  "TX queue %d passed %s loopback test with a burst length "
559 		  "of %d packets\n", tx_queue->queue, LOOPBACK_MODE(efx),
560 		  state->packet_count);
561 
562 	return 0;
563 }
564 
565 /* Wait for link up. On Falcon, we would prefer to rely on efx_monitor, but
566  * any contention on the mac lock (via e.g. efx_mac_mcast_work) causes it
567  * to delay and retry. Therefore, it's safer to just poll directly. Wait
568  * for link up and any faults to dissipate. */
569 static int efx_wait_for_link(struct efx_nic *efx)
570 {
571 	struct efx_link_state *link_state = &efx->link_state;
572 	int count, link_up_count = 0;
573 	bool link_up;
574 
575 	for (count = 0; count < 40; count++) {
576 		schedule_timeout_uninterruptible(HZ / 10);
577 
578 		if (efx->type->monitor != NULL) {
579 			mutex_lock(&efx->mac_lock);
580 			efx->type->monitor(efx);
581 			mutex_unlock(&efx->mac_lock);
582 		}
583 
584 		mutex_lock(&efx->mac_lock);
585 		link_up = link_state->up;
586 		if (link_up)
587 			link_up = !efx->type->check_mac_fault(efx);
588 		mutex_unlock(&efx->mac_lock);
589 
590 		if (link_up) {
591 			if (++link_up_count == 2)
592 				return 0;
593 		} else {
594 			link_up_count = 0;
595 		}
596 	}
597 
598 	return -ETIMEDOUT;
599 }
600 
601 static int efx_test_loopbacks(struct efx_nic *efx, struct efx_self_tests *tests,
602 			      unsigned int loopback_modes)
603 {
604 	enum efx_loopback_mode mode;
605 	struct efx_loopback_state *state;
606 	struct efx_channel *channel =
607 		efx_get_channel(efx, efx->tx_channel_offset);
608 	struct efx_tx_queue *tx_queue;
609 	int rc = 0;
610 
611 	/* Set the port loopback_selftest member. From this point on
612 	 * all received packets will be dropped. Mark the state as
613 	 * "flushing" so all inflight packets are dropped */
614 	state = kzalloc(sizeof(*state), GFP_KERNEL);
615 	if (state == NULL)
616 		return -ENOMEM;
617 	BUG_ON(efx->loopback_selftest);
618 	state->flush = true;
619 	efx->loopback_selftest = state;
620 
621 	/* Test all supported loopback modes */
622 	for (mode = LOOPBACK_NONE; mode <= LOOPBACK_TEST_MAX; mode++) {
623 		if (!(loopback_modes & (1 << mode)))
624 			continue;
625 
626 		/* Move the port into the specified loopback mode. */
627 		state->flush = true;
628 		mutex_lock(&efx->mac_lock);
629 		efx->loopback_mode = mode;
630 		rc = __efx_reconfigure_port(efx);
631 		mutex_unlock(&efx->mac_lock);
632 		if (rc) {
633 			netif_err(efx, drv, efx->net_dev,
634 				  "unable to move into %s loopback\n",
635 				  LOOPBACK_MODE(efx));
636 			goto out;
637 		}
638 
639 		rc = efx_wait_for_link(efx);
640 		if (rc) {
641 			netif_err(efx, drv, efx->net_dev,
642 				  "loopback %s never came up\n",
643 				  LOOPBACK_MODE(efx));
644 			goto out;
645 		}
646 
647 		/* Test all enabled types of TX queue */
648 		efx_for_each_channel_tx_queue(tx_queue, channel) {
649 			state->offload_csum = (tx_queue->queue &
650 					       EFX_TXQ_TYPE_OFFLOAD);
651 			rc = efx_test_loopback(tx_queue,
652 					       &tests->loopback[mode]);
653 			if (rc)
654 				goto out;
655 		}
656 	}
657 
658  out:
659 	/* Remove the flush. The caller will remove the loopback setting */
660 	state->flush = true;
661 	efx->loopback_selftest = NULL;
662 	wmb();
663 	kfree(state);
664 
665 	return rc;
666 }
667 
668 /**************************************************************************
669  *
670  * Entry point
671  *
672  *************************************************************************/
673 
674 int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
675 		 unsigned flags)
676 {
677 	enum efx_loopback_mode loopback_mode = efx->loopback_mode;
678 	int phy_mode = efx->phy_mode;
679 	int rc_test = 0, rc_reset, rc;
680 
681 	efx_selftest_async_cancel(efx);
682 
683 	/* Online (i.e. non-disruptive) testing
684 	 * This checks interrupt generation, event delivery and PHY presence. */
685 
686 	rc = efx_test_phy_alive(efx, tests);
687 	if (rc && !rc_test)
688 		rc_test = rc;
689 
690 	rc = efx_test_nvram(efx, tests);
691 	if (rc && !rc_test)
692 		rc_test = rc;
693 
694 	rc = efx_test_interrupts(efx, tests);
695 	if (rc && !rc_test)
696 		rc_test = rc;
697 
698 	rc = efx_test_eventq_irq(efx, tests);
699 	if (rc && !rc_test)
700 		rc_test = rc;
701 
702 	if (rc_test)
703 		return rc_test;
704 
705 	if (!(flags & ETH_TEST_FL_OFFLINE))
706 		return efx_test_phy(efx, tests, flags);
707 
708 	/* Offline (i.e. disruptive) testing
709 	 * This checks MAC and PHY loopback on the specified port. */
710 
711 	/* Detach the device so the kernel doesn't transmit during the
712 	 * loopback test and the watchdog timeout doesn't fire.
713 	 */
714 	efx_device_detach_sync(efx);
715 
716 	if (efx->type->test_chip) {
717 		rc_reset = efx->type->test_chip(efx, tests);
718 		if (rc_reset) {
719 			netif_err(efx, hw, efx->net_dev,
720 				  "Unable to recover from chip test\n");
721 			efx_schedule_reset(efx, RESET_TYPE_DISABLE);
722 			return rc_reset;
723 		}
724 
725 		if ((tests->memory < 0 || tests->registers < 0) && !rc_test)
726 			rc_test = -EIO;
727 	}
728 
729 	/* Ensure that the phy is powered and out of loopback
730 	 * for the bist and loopback tests */
731 	mutex_lock(&efx->mac_lock);
732 	efx->phy_mode &= ~PHY_MODE_LOW_POWER;
733 	efx->loopback_mode = LOOPBACK_NONE;
734 	__efx_reconfigure_port(efx);
735 	mutex_unlock(&efx->mac_lock);
736 
737 	rc = efx_test_phy(efx, tests, flags);
738 	if (rc && !rc_test)
739 		rc_test = rc;
740 
741 	rc = efx_test_loopbacks(efx, tests, efx->loopback_modes);
742 	if (rc && !rc_test)
743 		rc_test = rc;
744 
745 	/* restore the PHY to the previous state */
746 	mutex_lock(&efx->mac_lock);
747 	efx->phy_mode = phy_mode;
748 	efx->loopback_mode = loopback_mode;
749 	__efx_reconfigure_port(efx);
750 	mutex_unlock(&efx->mac_lock);
751 
752 	netif_device_attach(efx->net_dev);
753 
754 	return rc_test;
755 }
756 
757 void efx_selftest_async_start(struct efx_nic *efx)
758 {
759 	struct efx_channel *channel;
760 
761 	efx_for_each_channel(channel, efx)
762 		efx_nic_event_test_start(channel);
763 	schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
764 }
765 
766 void efx_selftest_async_cancel(struct efx_nic *efx)
767 {
768 	cancel_delayed_work_sync(&efx->selftest_work);
769 }
770 
771 void efx_selftest_async_work(struct work_struct *data)
772 {
773 	struct efx_nic *efx = container_of(data, struct efx_nic,
774 					   selftest_work.work);
775 	struct efx_channel *channel;
776 	int cpu;
777 
778 	efx_for_each_channel(channel, efx) {
779 		cpu = efx_nic_event_test_irq_cpu(channel);
780 		if (cpu < 0)
781 			netif_err(efx, ifup, efx->net_dev,
782 				  "channel %d failed to trigger an interrupt\n",
783 				  channel->channel);
784 		else
785 			netif_dbg(efx, ifup, efx->net_dev,
786 				  "channel %d triggered interrupt on CPU %d\n",
787 				  channel->channel, cpu);
788 	}
789 }
790