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 */
 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 * struct 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	rc = efx_mcdi_phy_test_alive(efx);
104	tests->phy_alive = rc ? -1 : 1;
 
 
105
106	return rc;
107}
108
109static 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 */
131static 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_nic_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 */
173static 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_nic_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_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_nic_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_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
254static 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_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 */
281void efx_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_selftest_state for a new iteration */
373static 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
408static 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
457static 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
464static 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
522static int
523efx_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. */
579static 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
611static 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_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
687int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests,
688		 unsigned 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_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_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_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_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
770void efx_selftest_async_start(struct efx_nic *efx)
771{
772	struct efx_channel *channel;
773
774	efx_for_each_channel(channel, efx)
775		efx_nic_event_test_start(channel);
776	schedule_delayed_work(&efx->selftest_work, IRQ_TIMEOUT);
777}
778
779void efx_selftest_async_cancel(struct efx_nic *efx)
780{
781	cancel_delayed_work_sync(&efx->selftest_work);
782}
783
784static void efx_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
804void efx_selftest_async_init(struct efx_nic *efx)
805{
806	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
807}