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