efx.c 89.3 KB
Newer Older
1
/****************************************************************************
B
Ben Hutchings 已提交
2
 * Driver for Solarflare network controllers and boards
3
 * Copyright 2005-2006 Fen Systems Ltd.
B
Ben Hutchings 已提交
4
 * Copyright 2005-2013 Solarflare Communications Inc.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/in.h>
#include <linux/ethtool.h>
21
#include <linux/topology.h>
22
#include <linux/gfp.h>
23
#include <linux/aer.h>
24
#include <linux/interrupt.h>
25 26
#include "net_driver.h"
#include "efx.h"
B
Ben Hutchings 已提交
27
#include "nic.h"
28
#include "selftest.h"
29
#include "sriov.h"
30

31
#include "mcdi.h"
32
#include "workarounds.h"
33

34 35 36 37 38 39 40 41 42
/**************************************************************************
 *
 * Type name strings
 *
 **************************************************************************
 */

/* Loopback mode names (see LOOPBACK_MODE()) */
const unsigned int efx_loopback_mode_max = LOOPBACK_MAX;
43
const char *const efx_loopback_mode_names[] = {
44
	[LOOPBACK_NONE]		= "NONE",
45
	[LOOPBACK_DATA]		= "DATAPATH",
46 47 48
	[LOOPBACK_GMAC]		= "GMAC",
	[LOOPBACK_XGMII]	= "XGMII",
	[LOOPBACK_XGXS]		= "XGXS",
49 50 51
	[LOOPBACK_XAUI]		= "XAUI",
	[LOOPBACK_GMII]		= "GMII",
	[LOOPBACK_SGMII]	= "SGMII",
52 53 54 55 56 57
	[LOOPBACK_XGBR]		= "XGBR",
	[LOOPBACK_XFI]		= "XFI",
	[LOOPBACK_XAUI_FAR]	= "XAUI_FAR",
	[LOOPBACK_GMII_FAR]	= "GMII_FAR",
	[LOOPBACK_SGMII_FAR]	= "SGMII_FAR",
	[LOOPBACK_XFI_FAR]	= "XFI_FAR",
58 59
	[LOOPBACK_GPHY]		= "GPHY",
	[LOOPBACK_PHYXS]	= "PHYXS",
60 61
	[LOOPBACK_PCS]		= "PCS",
	[LOOPBACK_PMAPMD]	= "PMA/PMD",
62 63
	[LOOPBACK_XPORT]	= "XPORT",
	[LOOPBACK_XGMII_WS]	= "XGMII_WS",
64
	[LOOPBACK_XAUI_WS]	= "XAUI_WS",
65 66
	[LOOPBACK_XAUI_WS_FAR]  = "XAUI_WS_FAR",
	[LOOPBACK_XAUI_WS_NEAR] = "XAUI_WS_NEAR",
67
	[LOOPBACK_GMII_WS]	= "GMII_WS",
68 69
	[LOOPBACK_XFI_WS]	= "XFI_WS",
	[LOOPBACK_XFI_WS_FAR]	= "XFI_WS_FAR",
70
	[LOOPBACK_PHYXS_WS]	= "PHYXS_WS",
71 72 73
};

const unsigned int efx_reset_type_max = RESET_TYPE_MAX;
74
const char *const efx_reset_type_names[] = {
75 76 77 78 79
	[RESET_TYPE_INVISIBLE]          = "INVISIBLE",
	[RESET_TYPE_ALL]                = "ALL",
	[RESET_TYPE_RECOVER_OR_ALL]     = "RECOVER_OR_ALL",
	[RESET_TYPE_WORLD]              = "WORLD",
	[RESET_TYPE_RECOVER_OR_DISABLE] = "RECOVER_OR_DISABLE",
80
	[RESET_TYPE_DATAPATH]           = "DATAPATH",
81
	[RESET_TYPE_MC_BIST]		= "MC_BIST",
82 83 84 85
	[RESET_TYPE_DISABLE]            = "DISABLE",
	[RESET_TYPE_TX_WATCHDOG]        = "TX_WATCHDOG",
	[RESET_TYPE_INT_ERROR]          = "INT_ERROR",
	[RESET_TYPE_RX_RECOVERY]        = "RX_RECOVERY",
86
	[RESET_TYPE_DMA_ERROR]          = "DMA_ERROR",
87 88
	[RESET_TYPE_TX_SKIP]            = "TX_SKIP",
	[RESET_TYPE_MC_FAILURE]         = "MC_FAILURE",
89
	[RESET_TYPE_MCDI_TIMEOUT]	= "MCDI_TIMEOUT (FLR)",
90 91
};

92 93 94 95 96 97
/* Reset workqueue. If any NIC has a hardware failure then a reset will be
 * queued onto this work queue. This is not a per-nic work queue, because
 * efx_reset_work() acquires the rtnl lock, so resets are naturally serialised.
 */
static struct workqueue_struct *reset_workqueue;

98 99 100 101 102 103
/* How often and how many times to poll for a reset while waiting for a
 * BIST that another function started to complete.
 */
#define BIST_WAIT_DELAY_MS	100
#define BIST_WAIT_DELAY_COUNT	100

104 105 106 107 108 109 110 111 112
/**************************************************************************
 *
 * Configurable values
 *
 *************************************************************************/

/*
 * Use separate channels for TX and RX events
 *
113 114
 * Set this to 1 to use separate channels for TX and RX. It allows us
 * to control interrupt affinity separately for TX and RX.
115
 *
116
 * This is only used in MSI-X interrupt mode
117
 */
118 119 120
bool efx_separate_tx_channels;
module_param(efx_separate_tx_channels, bool, 0444);
MODULE_PARM_DESC(efx_separate_tx_channels,
121
		 "Use separate channels for TX and RX");
122 123 124 125 126 127 128

/* This is the weight assigned to each of the (per-channel) virtual
 * NAPI devices.
 */
static int napi_weight = 64;

/* This is the time (in jiffies) between invocations of the hardware
129 130
 * monitor.
 * On Falcon-based NICs, this will:
131 132
 * - Check the on-board hardware monitor;
 * - Poll the link state and reconfigure the hardware as necessary.
133 134
 * On Siena-based NICs for power systems with EEH support, this will give EEH a
 * chance to start.
135
 */
S
stephen hemminger 已提交
136
static unsigned int efx_monitor_interval = 1 * HZ;
137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168

/* Initial interrupt moderation settings.  They can be modified after
 * module load with ethtool.
 *
 * The default for RX should strike a balance between increasing the
 * round-trip latency and reducing overhead.
 */
static unsigned int rx_irq_mod_usec = 60;

/* Initial interrupt moderation settings.  They can be modified after
 * module load with ethtool.
 *
 * This default is chosen to ensure that a 10G link does not go idle
 * while a TX queue is stopped after it has become full.  A queue is
 * restarted when it drops below half full.  The time this takes (assuming
 * worst case 3 descriptors per packet and 1024 descriptors) is
 *   512 / 3 * 1.2 = 205 usec.
 */
static unsigned int tx_irq_mod_usec = 150;

/* This is the first interrupt mode to try out of:
 * 0 => MSI-X
 * 1 => MSI
 * 2 => legacy
 */
static unsigned int interrupt_mode;

/* This is the requested number of CPUs to use for Receive-Side Scaling (RSS),
 * i.e. the number of CPUs among which we may distribute simultaneous
 * interrupt handling.
 *
 * Cards without MSI-X will only target one CPU via legacy or MSI interrupt.
169
 * The default (0) means to assign an interrupt to each core.
170 171 172 173 174
 */
static unsigned int rss_cpus;
module_param(rss_cpus, uint, 0444);
MODULE_PARM_DESC(rss_cpus, "Number of CPUs to use for Receive-Side Scaling");

175 176
static bool phy_flash_cfg;
module_param(phy_flash_cfg, bool, 0644);
177 178
MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");

179
static unsigned irq_adapt_low_thresh = 8000;
180 181 182 183
module_param(irq_adapt_low_thresh, uint, 0644);
MODULE_PARM_DESC(irq_adapt_low_thresh,
		 "Threshold score for reducing IRQ moderation");

184
static unsigned irq_adapt_high_thresh = 16000;
185 186 187 188
module_param(irq_adapt_high_thresh, uint, 0644);
MODULE_PARM_DESC(irq_adapt_high_thresh,
		 "Threshold score for increasing IRQ moderation");

189 190 191 192 193 194 195
static unsigned debug = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
			 NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
			 NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
			 NETIF_MSG_TX_ERR | NETIF_MSG_HW);
module_param(debug, uint, 0);
MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");

196 197 198 199 200
/**************************************************************************
 *
 * Utility functions and prototypes
 *
 *************************************************************************/
201

202
static int efx_soft_enable_interrupts(struct efx_nic *efx);
B
Ben Hutchings 已提交
203
static void efx_soft_disable_interrupts(struct efx_nic *efx);
204
static void efx_remove_channel(struct efx_channel *channel);
205
static void efx_remove_channels(struct efx_nic *efx);
206
static const struct efx_channel_type efx_default_channel_type;
207
static void efx_remove_port(struct efx_nic *efx);
208
static void efx_init_napi_channel(struct efx_channel *channel);
209
static void efx_fini_napi(struct efx_nic *efx);
210
static void efx_fini_napi_channel(struct efx_channel *channel);
211 212 213
static void efx_fini_struct(struct efx_nic *efx);
static void efx_start_all(struct efx_nic *efx);
static void efx_stop_all(struct efx_nic *efx);
214 215 216

#define EFX_ASSERT_RESET_SERIALISED(efx)		\
	do {						\
217
		if ((efx->state == STATE_READY) ||	\
218
		    (efx->state == STATE_RECOVERY) ||	\
219
		    (efx->state == STATE_DISABLED))	\
220 221 222
			ASSERT_RTNL();			\
	} while (0)

223 224
static int efx_check_disabled(struct efx_nic *efx)
{
225
	if (efx->state == STATE_DISABLED || efx->state == STATE_RECOVERY) {
226 227 228 229 230 231 232
		netif_err(efx, drv, efx->net_dev,
			  "device is disabled due to earlier errors\n");
		return -EIO;
	}
	return 0;
}

233 234 235 236 237 238 239 240 241 242 243 244 245
/**************************************************************************
 *
 * Event queue processing
 *
 *************************************************************************/

/* Process channel's event queue
 *
 * This function is responsible for processing the event queue of a
 * single channel.  The caller must guarantee that this function will
 * never be concurrently called more than once on the same channel,
 * though different channels may be being processed concurrently.
 */
246
static int efx_process_channel(struct efx_channel *channel, int budget)
247
{
248
	struct efx_tx_queue *tx_queue;
249
	int spent;
250

251
	if (unlikely(!channel->enabled))
B
Ben Hutchings 已提交
252
		return 0;
253

254 255 256 257 258
	efx_for_each_channel_tx_queue(tx_queue, channel) {
		tx_queue->pkts_compl = 0;
		tx_queue->bytes_compl = 0;
	}

259
	spent = efx_nic_process_eventq(channel, budget);
260 261 262 263
	if (spent && efx_channel_has_rx_queue(channel)) {
		struct efx_rx_queue *rx_queue =
			efx_channel_get_rx_queue(channel);

264
		efx_rx_flush_packet(channel);
265
		efx_fast_push_rx_descriptors(rx_queue, true);
266 267
	}

268 269 270 271 272 273 274 275
	/* Update BQL */
	efx_for_each_channel_tx_queue(tx_queue, channel) {
		if (tx_queue->bytes_compl) {
			netdev_tx_completed_queue(tx_queue->core_txq,
				tx_queue->pkts_compl, tx_queue->bytes_compl);
		}
	}

276
	return spent;
277 278 279 280 281 282 283 284 285 286 287
}

/* NAPI poll handler
 *
 * NAPI guarantees serialisation of polls of the same device, which
 * provides the guarantee required by efx_process_channel().
 */
static int efx_poll(struct napi_struct *napi, int budget)
{
	struct efx_channel *channel =
		container_of(napi, struct efx_channel, napi_str);
288
	struct efx_nic *efx = channel->efx;
289
	int spent;
290

291 292 293
	if (!efx_channel_lock_napi(channel))
		return budget;

294 295 296
	netif_vdbg(efx, intr, efx->net_dev,
		   "channel %d NAPI poll executing on CPU %d\n",
		   channel->channel, raw_smp_processor_id());
297

298
	spent = efx_process_channel(channel, budget);
299

300
	if (spent < budget) {
301
		if (efx_channel_has_rx_queue(channel) &&
302 303 304 305
		    efx->irq_rx_adaptive &&
		    unlikely(++channel->irq_count == 1000)) {
			if (unlikely(channel->irq_mod_score <
				     irq_adapt_low_thresh)) {
306 307
				if (channel->irq_moderation > 1) {
					channel->irq_moderation -= 1;
308
					efx->type->push_irq_moderation(channel);
309
				}
310 311
			} else if (unlikely(channel->irq_mod_score >
					    irq_adapt_high_thresh)) {
312 313 314
				if (channel->irq_moderation <
				    efx->irq_rx_moderation) {
					channel->irq_moderation += 1;
315
					efx->type->push_irq_moderation(channel);
316
				}
317 318 319 320 321
			}
			channel->irq_count = 0;
			channel->irq_mod_score = 0;
		}

322 323
		efx_filter_rfs_expire(channel);

324
		/* There is no race here; although napi_disable() will
325
		 * only wait for napi_complete(), this isn't a problem
326
		 * since efx_nic_eventq_read_ack() will have no effect if
327 328
		 * interrupts have already been disabled.
		 */
329
		napi_complete(napi);
330
		efx_nic_eventq_read_ack(channel);
331 332
	}

333
	efx_channel_unlock_napi(channel);
334
	return spent;
335 336 337 338 339 340 341 342 343
}

/* Create event queue
 * Event queue memory allocations are done only once.  If the channel
 * is reset, the memory buffer will be reused; this guards against
 * errors during channel reset and also simplifies interrupt handling.
 */
static int efx_probe_eventq(struct efx_channel *channel)
{
344 345 346
	struct efx_nic *efx = channel->efx;
	unsigned long entries;

347
	netif_dbg(efx, probe, efx->net_dev,
348
		  "chan %d create event queue\n", channel->channel);
349

350 351 352 353 354 355
	/* Build an event queue with room for one event per tx and rx buffer,
	 * plus some extra for link state events and MCDI completions. */
	entries = roundup_pow_of_two(efx->rxq_entries + efx->txq_entries + 128);
	EFX_BUG_ON_PARANOID(entries > EFX_MAX_EVQ_SIZE);
	channel->eventq_mask = max(entries, EFX_MIN_EVQ_SIZE) - 1;

356
	return efx_nic_probe_eventq(channel);
357 358 359
}

/* Prepare channel's event queue */
360
static int efx_init_eventq(struct efx_channel *channel)
361
{
362
	struct efx_nic *efx = channel->efx;
363 364 365 366
	int rc;

	EFX_WARN_ON_PARANOID(channel->eventq_init);

367
	netif_dbg(efx, drv, efx->net_dev,
368
		  "chan %d init event queue\n", channel->channel);
369

370 371
	rc = efx_nic_init_eventq(channel);
	if (rc == 0) {
372
		efx->type->push_irq_moderation(channel);
373 374 375 376
		channel->eventq_read_ptr = 0;
		channel->eventq_init = true;
	}
	return rc;
377 378
}

379
/* Enable event queue processing and NAPI */
380
void efx_start_eventq(struct efx_channel *channel)
381 382 383 384
{
	netif_dbg(channel->efx, ifup, channel->efx->net_dev,
		  "chan %d start event queue\n", channel->channel);

385
	/* Make sure the NAPI handler sees the enabled flag set */
386 387 388
	channel->enabled = true;
	smp_wmb();

389
	efx_channel_enable(channel);
390 391 392 393 394
	napi_enable(&channel->napi_str);
	efx_nic_eventq_read_ack(channel);
}

/* Disable event queue processing and NAPI */
395
void efx_stop_eventq(struct efx_channel *channel)
396 397 398 399 400
{
	if (!channel->enabled)
		return;

	napi_disable(&channel->napi_str);
401 402
	while (!efx_channel_disable(channel))
		usleep_range(1000, 20000);
403 404 405
	channel->enabled = false;
}

406 407
static void efx_fini_eventq(struct efx_channel *channel)
{
408 409 410
	if (!channel->eventq_init)
		return;

411 412
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "chan %d fini event queue\n", channel->channel);
413

414
	efx_nic_fini_eventq(channel);
415
	channel->eventq_init = false;
416 417 418 419
}

static void efx_remove_eventq(struct efx_channel *channel)
{
420 421
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "chan %d remove event queue\n", channel->channel);
422

423
	efx_nic_remove_eventq(channel);
424 425 426 427 428 429 430 431
}

/**************************************************************************
 *
 * Channel handling
 *
 *************************************************************************/

432
/* Allocate and initialise a channel structure. */
433 434 435 436 437 438 439 440
static struct efx_channel *
efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
{
	struct efx_channel *channel;
	struct efx_rx_queue *rx_queue;
	struct efx_tx_queue *tx_queue;
	int j;

441 442 443
	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return NULL;
444

445 446 447
	channel->efx = efx;
	channel->channel = i;
	channel->type = &efx_default_channel_type;
448

449 450 451 452 453 454
	for (j = 0; j < EFX_TXQ_TYPES; j++) {
		tx_queue = &channel->tx_queue[j];
		tx_queue->efx = efx;
		tx_queue->queue = i * EFX_TXQ_TYPES + j;
		tx_queue->channel = channel;
	}
455

456 457 458 459
	rx_queue = &channel->rx_queue;
	rx_queue->efx = efx;
	setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
		    (unsigned long)rx_queue);
460

461 462 463 464 465 466 467 468 469 470 471 472 473
	return channel;
}

/* Allocate and initialise a channel structure, copying parameters
 * (but not resources) from an old channel structure.
 */
static struct efx_channel *
efx_copy_channel(const struct efx_channel *old_channel)
{
	struct efx_channel *channel;
	struct efx_rx_queue *rx_queue;
	struct efx_tx_queue *tx_queue;
	int j;
474

475 476 477 478 479 480 481 482
	channel = kmalloc(sizeof(*channel), GFP_KERNEL);
	if (!channel)
		return NULL;

	*channel = *old_channel;

	channel->napi_dev = NULL;
	memset(&channel->eventq, 0, sizeof(channel->eventq));
483

484 485 486
	for (j = 0; j < EFX_TXQ_TYPES; j++) {
		tx_queue = &channel->tx_queue[j];
		if (tx_queue->channel)
487
			tx_queue->channel = channel;
488 489
		tx_queue->buffer = NULL;
		memset(&tx_queue->txd, 0, sizeof(tx_queue->txd));
490 491 492
	}

	rx_queue = &channel->rx_queue;
493 494
	rx_queue->buffer = NULL;
	memset(&rx_queue->rxd, 0, sizeof(rx_queue->rxd));
495 496 497 498 499 500
	setup_timer(&rx_queue->slow_fill, efx_rx_slow_fill,
		    (unsigned long)rx_queue);

	return channel;
}

501 502 503 504 505 506
static int efx_probe_channel(struct efx_channel *channel)
{
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	int rc;

507 508
	netif_dbg(channel->efx, probe, channel->efx->net_dev,
		  "creating channel %d\n", channel->channel);
509

510 511 512 513
	rc = channel->type->pre_probe(channel);
	if (rc)
		goto fail;

514 515
	rc = efx_probe_eventq(channel);
	if (rc)
516
		goto fail;
517 518 519 520

	efx_for_each_channel_tx_queue(tx_queue, channel) {
		rc = efx_probe_tx_queue(tx_queue);
		if (rc)
521
			goto fail;
522 523 524 525 526
	}

	efx_for_each_channel_rx_queue(rx_queue, channel) {
		rc = efx_probe_rx_queue(rx_queue);
		if (rc)
527
			goto fail;
528 529 530 531
	}

	return 0;

532 533
fail:
	efx_remove_channel(channel);
534 535 536
	return rc;
}

537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554
static void
efx_get_channel_name(struct efx_channel *channel, char *buf, size_t len)
{
	struct efx_nic *efx = channel->efx;
	const char *type;
	int number;

	number = channel->channel;
	if (efx->tx_channel_offset == 0) {
		type = "";
	} else if (channel->channel < efx->tx_channel_offset) {
		type = "-rx";
	} else {
		type = "-tx";
		number -= efx->tx_channel_offset;
	}
	snprintf(buf, len, "%s%s-%d", efx->name, type, number);
}
555

556 557 558 559
static void efx_set_channel_names(struct efx_nic *efx)
{
	struct efx_channel *channel;

560 561
	efx_for_each_channel(channel, efx)
		channel->type->get_name(channel,
B
Ben Hutchings 已提交
562 563
					efx->msi_context[channel->channel].name,
					sizeof(efx->msi_context[0].name));
564 565
}

566 567 568 569 570 571 572 573
static int efx_probe_channels(struct efx_nic *efx)
{
	struct efx_channel *channel;
	int rc;

	/* Restart special buffer allocation */
	efx->next_buffer_table = 0;

574 575 576 577 578 579
	/* Probe channels in reverse, so that any 'extra' channels
	 * use the start of the buffer table. This allows the traffic
	 * channels to be resized without moving them or wasting the
	 * entries before them.
	 */
	efx_for_each_channel_rev(channel, efx) {
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
		rc = efx_probe_channel(channel);
		if (rc) {
			netif_err(efx, probe, efx->net_dev,
				  "failed to create channel %d\n",
				  channel->channel);
			goto fail;
		}
	}
	efx_set_channel_names(efx);

	return 0;

fail:
	efx_remove_channels(efx);
	return rc;
}

597 598 599 600
/* Channels are shutdown and reinitialised whilst the NIC is running
 * to propagate configuration changes (mtu, checksum offload), or
 * to clear hardware error conditions
 */
601
static void efx_start_datapath(struct efx_nic *efx)
602
{
603
	bool old_rx_scatter = efx->rx_scatter;
604 605 606
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	struct efx_channel *channel;
607
	size_t rx_buf_len;
608

609 610 611 612
	/* Calculate the rx buffer allocation parameters required to
	 * support the current MTU, including padding for header
	 * alignment and overruns.
	 */
613
	efx->rx_dma_len = (efx->rx_prefix_size +
614 615
			   EFX_MAX_FRAME_LEN(efx->net_dev->mtu) +
			   efx->type->rx_buffer_padding);
616
	rx_buf_len = (sizeof(struct efx_rx_page_state) +
617
		      efx->rx_ip_align + efx->rx_dma_len);
618
	if (rx_buf_len <= PAGE_SIZE) {
J
Jon Cooper 已提交
619
		efx->rx_scatter = efx->type->always_rx_scatter;
620 621
		efx->rx_buffer_order = 0;
	} else if (efx->type->can_rx_scatter) {
622
		BUILD_BUG_ON(EFX_RX_USR_BUF_SIZE % L1_CACHE_BYTES);
623
		BUILD_BUG_ON(sizeof(struct efx_rx_page_state) +
624 625 626
			     2 * ALIGN(NET_IP_ALIGN + EFX_RX_USR_BUF_SIZE,
				       EFX_RX_BUF_ALIGNMENT) >
			     PAGE_SIZE);
627 628 629 630 631 632 633 634
		efx->rx_scatter = true;
		efx->rx_dma_len = EFX_RX_USR_BUF_SIZE;
		efx->rx_buffer_order = 0;
	} else {
		efx->rx_scatter = false;
		efx->rx_buffer_order = get_order(rx_buf_len);
	}

635 636 637 638 639 640 641 642 643 644 645
	efx_rx_config_page_split(efx);
	if (efx->rx_buffer_order)
		netif_dbg(efx, drv, efx->net_dev,
			  "RX buf len=%u; page order=%u batch=%u\n",
			  efx->rx_dma_len, efx->rx_buffer_order,
			  efx->rx_pages_per_batch);
	else
		netif_dbg(efx, drv, efx->net_dev,
			  "RX buf len=%u step=%u bpp=%u; page batch=%u\n",
			  efx->rx_dma_len, efx->rx_page_buf_step,
			  efx->rx_bufs_per_page, efx->rx_pages_per_batch);
646

J
Jon Cooper 已提交
647
	/* RX filters may also have scatter-enabled flags */
648
	if (efx->rx_scatter != old_rx_scatter)
649
		efx->type->filter_update_rx_scatter(efx);
650

651 652 653 654 655 656 657 658 659 660
	/* We must keep at least one descriptor in a TX ring empty.
	 * We could avoid this when the queue size does not exactly
	 * match the hardware ring size, but it's not that important.
	 * Therefore we stop the queue when one more skb might fill
	 * the ring completely.  We wake it when half way back to
	 * empty.
	 */
	efx->txq_stop_thresh = efx->txq_entries - efx_tx_max_skb_descs(efx);
	efx->txq_wake_thresh = efx->txq_stop_thresh / 2;

661 662
	/* Initialise the channels */
	efx_for_each_channel(channel, efx) {
663
		efx_for_each_channel_tx_queue(tx_queue, channel) {
664
			efx_init_tx_queue(tx_queue);
665 666
			atomic_inc(&efx->active_queues);
		}
667

668
		efx_for_each_channel_rx_queue(rx_queue, channel) {
669
			efx_init_rx_queue(rx_queue);
670
			atomic_inc(&efx->active_queues);
671 672 673
			efx_stop_eventq(channel);
			efx_fast_push_rx_descriptors(rx_queue, false);
			efx_start_eventq(channel);
674
		}
675

676
		WARN_ON(channel->rx_pkt_n_frags);
677 678
	}

679 680
	efx_ptp_start_datapath(efx);

681 682
	if (netif_device_present(efx->net_dev))
		netif_tx_wake_all_queues(efx->net_dev);
683 684
}

685
static void efx_stop_datapath(struct efx_nic *efx)
686 687 688 689
{
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
690
	int rc;
691 692 693 694

	EFX_ASSERT_RESET_SERIALISED(efx);
	BUG_ON(efx->port_enabled);

695 696
	efx_ptp_stop_datapath(efx);

697 698 699 700 701 702
	/* Stop RX refill */
	efx_for_each_channel(channel, efx) {
		efx_for_each_channel_rx_queue(rx_queue, channel)
			rx_queue->refill_enabled = false;
	}

703
	efx_for_each_channel(channel, efx) {
704 705 706 707 708 709 710 711 712 713
		/* RX packet processing is pipelined, so wait for the
		 * NAPI handler to complete.  At least event queue 0
		 * might be kept active by non-data events, so don't
		 * use napi_synchronize() but actually disable NAPI
		 * temporarily.
		 */
		if (efx_channel_has_rx_queue(channel)) {
			efx_stop_eventq(channel);
			efx_start_eventq(channel);
		}
714
	}
715

716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
	rc = efx->type->fini_dmaq(efx);
	if (rc && EFX_WORKAROUND_7803(efx)) {
		/* Schedule a reset to recover from the flush failure. The
		 * descriptor caches reference memory we're about to free,
		 * but falcon_reconfigure_mac_wrapper() won't reconnect
		 * the MACs because of the pending reset.
		 */
		netif_err(efx, drv, efx->net_dev,
			  "Resetting to recover from flush failure\n");
		efx_schedule_reset(efx, RESET_TYPE_ALL);
	} else if (rc) {
		netif_err(efx, drv, efx->net_dev, "failed to flush queues\n");
	} else {
		netif_dbg(efx, drv, efx->net_dev,
			  "successfully flushed all queues\n");
	}

	efx_for_each_channel(channel, efx) {
734 735
		efx_for_each_channel_rx_queue(rx_queue, channel)
			efx_fini_rx_queue(rx_queue);
736
		efx_for_each_possible_channel_tx_queue(tx_queue, channel)
737 738 739 740 741 742 743 744 745
			efx_fini_tx_queue(tx_queue);
	}
}

static void efx_remove_channel(struct efx_channel *channel)
{
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;

746 747
	netif_dbg(channel->efx, drv, channel->efx->net_dev,
		  "destroy chan %d\n", channel->channel);
748 749 750

	efx_for_each_channel_rx_queue(rx_queue, channel)
		efx_remove_rx_queue(rx_queue);
751
	efx_for_each_possible_channel_tx_queue(tx_queue, channel)
752 753
		efx_remove_tx_queue(tx_queue);
	efx_remove_eventq(channel);
754
	channel->type->post_remove(channel);
755 756
}

757 758 759 760 761 762 763 764 765 766 767 768 769
static void efx_remove_channels(struct efx_nic *efx)
{
	struct efx_channel *channel;

	efx_for_each_channel(channel, efx)
		efx_remove_channel(channel);
}

int
efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
{
	struct efx_channel *other_channel[EFX_MAX_CHANNELS], *channel;
	u32 old_rxq_entries, old_txq_entries;
770
	unsigned i, next_buffer_table = 0;
771
	int rc, rc2;
772 773 774 775

	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797

	/* Not all channels should be reallocated. We must avoid
	 * reallocating their buffer table entries.
	 */
	efx_for_each_channel(channel, efx) {
		struct efx_rx_queue *rx_queue;
		struct efx_tx_queue *tx_queue;

		if (channel->type->copy)
			continue;
		next_buffer_table = max(next_buffer_table,
					channel->eventq.index +
					channel->eventq.entries);
		efx_for_each_channel_rx_queue(rx_queue, channel)
			next_buffer_table = max(next_buffer_table,
						rx_queue->rxd.index +
						rx_queue->rxd.entries);
		efx_for_each_channel_tx_queue(tx_queue, channel)
			next_buffer_table = max(next_buffer_table,
						tx_queue->txd.index +
						tx_queue->txd.entries);
	}
798

799
	efx_device_detach_sync(efx);
800
	efx_stop_all(efx);
B
Ben Hutchings 已提交
801
	efx_soft_disable_interrupts(efx);
802

803
	/* Clone channels (where possible) */
804 805
	memset(other_channel, 0, sizeof(other_channel));
	for (i = 0; i < efx->n_channels; i++) {
806 807 808
		channel = efx->channel[i];
		if (channel->type->copy)
			channel = channel->type->copy(channel);
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
		if (!channel) {
			rc = -ENOMEM;
			goto out;
		}
		other_channel[i] = channel;
	}

	/* Swap entry counts and channel pointers */
	old_rxq_entries = efx->rxq_entries;
	old_txq_entries = efx->txq_entries;
	efx->rxq_entries = rxq_entries;
	efx->txq_entries = txq_entries;
	for (i = 0; i < efx->n_channels; i++) {
		channel = efx->channel[i];
		efx->channel[i] = other_channel[i];
		other_channel[i] = channel;
	}

827 828
	/* Restart buffer table allocation */
	efx->next_buffer_table = next_buffer_table;
829 830

	for (i = 0; i < efx->n_channels; i++) {
831 832 833 834 835 836 837
		channel = efx->channel[i];
		if (!channel->type->copy)
			continue;
		rc = efx_probe_channel(channel);
		if (rc)
			goto rollback;
		efx_init_napi_channel(efx->channel[i]);
838
	}
839

840
out:
841 842 843 844 845 846 847 848 849
	/* Destroy unused channel structures */
	for (i = 0; i < efx->n_channels; i++) {
		channel = other_channel[i];
		if (channel && channel->type->copy) {
			efx_fini_napi_channel(channel);
			efx_remove_channel(channel);
			kfree(channel);
		}
	}
850

851 852 853 854 855 856 857 858 859 860
	rc2 = efx_soft_enable_interrupts(efx);
	if (rc2) {
		rc = rc ? rc : rc2;
		netif_err(efx, drv, efx->net_dev,
			  "unable to restart interrupts on channel reallocation\n");
		efx_schedule_reset(efx, RESET_TYPE_DISABLE);
	} else {
		efx_start_all(efx);
		netif_device_attach(efx->net_dev);
	}
861 862 863 864 865 866 867 868 869 870 871 872 873 874
	return rc;

rollback:
	/* Swap back */
	efx->rxq_entries = old_rxq_entries;
	efx->txq_entries = old_txq_entries;
	for (i = 0; i < efx->n_channels; i++) {
		channel = efx->channel[i];
		efx->channel[i] = other_channel[i];
		other_channel[i] = channel;
	}
	goto out;
}

875
void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue)
876
{
877
	mod_timer(&rx_queue->slow_fill, jiffies + msecs_to_jiffies(100));
878 879
}

880 881
static const struct efx_channel_type efx_default_channel_type = {
	.pre_probe		= efx_channel_dummy_op_int,
882
	.post_remove		= efx_channel_dummy_op_void,
883 884 885 886 887 888 889 890 891 892
	.get_name		= efx_get_channel_name,
	.copy			= efx_copy_channel,
	.keep_eventq		= false,
};

int efx_channel_dummy_op_int(struct efx_channel *channel)
{
	return 0;
}

893 894 895 896
void efx_channel_dummy_op_void(struct efx_channel *channel)
{
}

897 898 899 900 901 902 903 904 905 906
/**************************************************************************
 *
 * Port handling
 *
 **************************************************************************/

/* This ensures that the kernel is kept informed (via
 * netif_carrier_on/off) of the link status, and also maintains the
 * link status's stop on the port's TX queue.
 */
S
Steve Hodgson 已提交
907
void efx_link_status_changed(struct efx_nic *efx)
908
{
909 910
	struct efx_link_state *link_state = &efx->link_state;

911 912 913 914 915 916 917
	/* SFC Bug 5356: A net_dev notifier is registered, so we must ensure
	 * that no events are triggered between unregister_netdev() and the
	 * driver unloading. A more general condition is that NETDEV_CHANGE
	 * can only be generated between NETDEV_UP and NETDEV_DOWN */
	if (!netif_running(efx->net_dev))
		return;

918
	if (link_state->up != netif_carrier_ok(efx->net_dev)) {
919 920
		efx->n_link_state_changes++;

921
		if (link_state->up)
922 923 924 925 926 927
			netif_carrier_on(efx->net_dev);
		else
			netif_carrier_off(efx->net_dev);
	}

	/* Status message for kernel log */
B
Ben Hutchings 已提交
928
	if (link_state->up)
929
		netif_info(efx, link, efx->net_dev,
930
			   "link up at %uMbps %s-duplex (MTU %d)\n",
931
			   link_state->speed, link_state->fd ? "full" : "half",
932
			   efx->net_dev->mtu);
B
Ben Hutchings 已提交
933
	else
934
		netif_info(efx, link, efx->net_dev, "link down\n");
935 936
}

B
Ben Hutchings 已提交
937 938 939 940 941 942 943 944 945 946 947 948 949
void efx_link_set_advertising(struct efx_nic *efx, u32 advertising)
{
	efx->link_advertising = advertising;
	if (advertising) {
		if (advertising & ADVERTISED_Pause)
			efx->wanted_fc |= (EFX_FC_TX | EFX_FC_RX);
		else
			efx->wanted_fc &= ~(EFX_FC_TX | EFX_FC_RX);
		if (advertising & ADVERTISED_Asym_Pause)
			efx->wanted_fc ^= EFX_FC_TX;
	}
}

950
void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
B
Ben Hutchings 已提交
951 952 953 954 955 956 957 958 959 960 961 962 963 964
{
	efx->wanted_fc = wanted_fc;
	if (efx->link_advertising) {
		if (wanted_fc & EFX_FC_RX)
			efx->link_advertising |= (ADVERTISED_Pause |
						  ADVERTISED_Asym_Pause);
		else
			efx->link_advertising &= ~(ADVERTISED_Pause |
						   ADVERTISED_Asym_Pause);
		if (wanted_fc & EFX_FC_TX)
			efx->link_advertising ^= ADVERTISED_Asym_Pause;
	}
}

965 966
static void efx_fini_port(struct efx_nic *efx);

967 968 969 970 971 972 973 974 975 976
/* We assume that efx->type->reconfigure_mac will always try to sync RX
 * filters and therefore needs to read-lock the filter table against freeing
 */
void efx_mac_reconfigure(struct efx_nic *efx)
{
	down_read(&efx->filter_sem);
	efx->type->reconfigure_mac(efx);
	up_read(&efx->filter_sem);
}

B
Ben Hutchings 已提交
977 978 979 980 981 982 983 984
/* Push loopback/power/transmit disable settings to the PHY, and reconfigure
 * the MAC appropriately. All other PHY configuration changes are pushed
 * through phy_op->set_settings(), and pushed asynchronously to the MAC
 * through efx_monitor().
 *
 * Callers must hold the mac_lock
 */
int __efx_reconfigure_port(struct efx_nic *efx)
985
{
B
Ben Hutchings 已提交
986 987
	enum efx_phy_mode phy_mode;
	int rc;
988

B
Ben Hutchings 已提交
989
	WARN_ON(!mutex_is_locked(&efx->mac_lock));
990

B
Ben Hutchings 已提交
991 992
	/* Disable PHY transmit in mac level loopbacks */
	phy_mode = efx->phy_mode;
993 994 995 996 997
	if (LOOPBACK_INTERNAL(efx))
		efx->phy_mode |= PHY_MODE_TX_DISABLED;
	else
		efx->phy_mode &= ~PHY_MODE_TX_DISABLED;

B
Ben Hutchings 已提交
998
	rc = efx->type->reconfigure_port(efx);
999

B
Ben Hutchings 已提交
1000 1001
	if (rc)
		efx->phy_mode = phy_mode;
1002

B
Ben Hutchings 已提交
1003
	return rc;
1004 1005 1006 1007
}

/* Reinitialise the MAC to pick up new PHY settings, even if the port is
 * disabled. */
B
Ben Hutchings 已提交
1008
int efx_reconfigure_port(struct efx_nic *efx)
1009
{
B
Ben Hutchings 已提交
1010 1011
	int rc;

1012 1013 1014
	EFX_ASSERT_RESET_SERIALISED(efx);

	mutex_lock(&efx->mac_lock);
B
Ben Hutchings 已提交
1015
	rc = __efx_reconfigure_port(efx);
1016
	mutex_unlock(&efx->mac_lock);
B
Ben Hutchings 已提交
1017 1018

	return rc;
1019 1020
}

1021 1022 1023
/* Asynchronous work item for changing MAC promiscuity and multicast
 * hash.  Avoid a drain/rx_ingress enable by reconfiguring the current
 * MAC directly. */
1024 1025 1026 1027 1028
static void efx_mac_work(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic, mac_work);

	mutex_lock(&efx->mac_lock);
1029
	if (efx->port_enabled)
1030
		efx_mac_reconfigure(efx);
1031 1032 1033
	mutex_unlock(&efx->mac_lock);
}

1034 1035 1036 1037
static int efx_probe_port(struct efx_nic *efx)
{
	int rc;

1038
	netif_dbg(efx, probe, efx->net_dev, "create port\n");
1039

1040 1041 1042
	if (phy_flash_cfg)
		efx->phy_mode = PHY_MODE_SPECIAL;

1043 1044
	/* Connect up MAC/PHY operations table */
	rc = efx->type->probe_port(efx);
1045
	if (rc)
1046
		return rc;
1047

1048
	/* Initialise MAC address to permanent address */
1049
	ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
1050 1051 1052 1053 1054 1055 1056 1057

	return 0;
}

static int efx_init_port(struct efx_nic *efx)
{
	int rc;

1058
	netif_dbg(efx, drv, efx->net_dev, "init port\n");
1059

1060 1061
	mutex_lock(&efx->mac_lock);

1062
	rc = efx->phy_op->init(efx);
1063
	if (rc)
1064
		goto fail1;
1065

1066
	efx->port_initialized = true;
1067

B
Ben Hutchings 已提交
1068 1069
	/* Reconfigure the MAC before creating dma queues (required for
	 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
1070
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
1071 1072 1073

	/* Ensure the PHY advertises the correct flow control settings */
	rc = efx->phy_op->reconfigure(efx);
1074
	if (rc && rc != -EPERM)
B
Ben Hutchings 已提交
1075 1076
		goto fail2;

1077
	mutex_unlock(&efx->mac_lock);
1078
	return 0;
1079

1080
fail2:
1081
	efx->phy_op->fini(efx);
1082 1083
fail1:
	mutex_unlock(&efx->mac_lock);
1084
	return rc;
1085 1086 1087 1088
}

static void efx_start_port(struct efx_nic *efx)
{
1089
	netif_dbg(efx, ifup, efx->net_dev, "start port\n");
1090 1091 1092
	BUG_ON(efx->port_enabled);

	mutex_lock(&efx->mac_lock);
1093
	efx->port_enabled = true;
1094

1095
	/* Ensure MAC ingress/egress is enabled */
1096
	efx_mac_reconfigure(efx);
1097

1098 1099 1100
	mutex_unlock(&efx->mac_lock);
}

1101 1102 1103 1104 1105
/* Cancel work for MAC reconfiguration, periodic hardware monitoring
 * and the async self-test, wait for them to finish and prevent them
 * being scheduled again.  This doesn't cover online resets, which
 * should only be cancelled when removing the device.
 */
1106 1107
static void efx_stop_port(struct efx_nic *efx)
{
1108
	netif_dbg(efx, ifdown, efx->net_dev, "stop port\n");
1109

1110 1111
	EFX_ASSERT_RESET_SERIALISED(efx);

1112
	mutex_lock(&efx->mac_lock);
1113
	efx->port_enabled = false;
1114 1115 1116
	mutex_unlock(&efx->mac_lock);

	/* Serialise against efx_set_multicast_list() */
1117 1118
	netif_addr_lock_bh(efx->net_dev);
	netif_addr_unlock_bh(efx->net_dev);
1119 1120 1121 1122

	cancel_delayed_work_sync(&efx->monitor_work);
	efx_selftest_async_cancel(efx);
	cancel_work_sync(&efx->mac_work);
1123 1124 1125 1126
}

static void efx_fini_port(struct efx_nic *efx)
{
1127
	netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
1128 1129 1130 1131

	if (!efx->port_initialized)
		return;

1132
	efx->phy_op->fini(efx);
1133
	efx->port_initialized = false;
1134

1135
	efx->link_state.up = false;
1136 1137 1138 1139 1140
	efx_link_status_changed(efx);
}

static void efx_remove_port(struct efx_nic *efx)
{
1141
	netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
1142

1143
	efx->type->remove_port(efx);
1144 1145 1146 1147 1148 1149 1150 1151
}

/**************************************************************************
 *
 * NIC handling
 *
 **************************************************************************/

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
static LIST_HEAD(efx_primary_list);
static LIST_HEAD(efx_unassociated_list);

static bool efx_same_controller(struct efx_nic *left, struct efx_nic *right)
{
	return left->type == right->type &&
		left->vpd_sn && right->vpd_sn &&
		!strcmp(left->vpd_sn, right->vpd_sn);
}

static void efx_associate(struct efx_nic *efx)
{
	struct efx_nic *other, *next;

	if (efx->primary == efx) {
		/* Adding primary function; look for secondaries */

		netif_dbg(efx, probe, efx->net_dev, "adding to primary list\n");
		list_add_tail(&efx->node, &efx_primary_list);

		list_for_each_entry_safe(other, next, &efx_unassociated_list,
					 node) {
			if (efx_same_controller(efx, other)) {
				list_del(&other->node);
				netif_dbg(other, probe, other->net_dev,
					  "moving to secondary list of %s %s\n",
					  pci_name(efx->pci_dev),
					  efx->net_dev->name);
				list_add_tail(&other->node,
					      &efx->secondary_list);
				other->primary = efx;
			}
		}
	} else {
		/* Adding secondary function; look for primary */

		list_for_each_entry(other, &efx_primary_list, node) {
			if (efx_same_controller(efx, other)) {
				netif_dbg(efx, probe, efx->net_dev,
					  "adding to secondary list of %s %s\n",
					  pci_name(other->pci_dev),
					  other->net_dev->name);
				list_add_tail(&efx->node,
					      &other->secondary_list);
				efx->primary = other;
				return;
			}
		}

		netif_dbg(efx, probe, efx->net_dev,
			  "adding to unassociated list\n");
		list_add_tail(&efx->node, &efx_unassociated_list);
	}
}

static void efx_dissociate(struct efx_nic *efx)
{
	struct efx_nic *other, *next;

	list_del(&efx->node);
	efx->primary = NULL;

	list_for_each_entry_safe(other, next, &efx->secondary_list, node) {
		list_del(&other->node);
		netif_dbg(other, probe, other->net_dev,
			  "moving to unassociated list\n");
		list_add_tail(&other->node, &efx_unassociated_list);
		other->primary = NULL;
	}
}

1223 1224 1225 1226 1227
/* This configures the PCI device to enable I/O and DMA. */
static int efx_init_io(struct efx_nic *efx)
{
	struct pci_dev *pci_dev = efx->pci_dev;
	dma_addr_t dma_mask = efx->type->max_dma_mask;
1228
	unsigned int mem_map_size = efx->type->mem_map_size(efx);
1229
	int rc, bar;
1230

1231
	netif_dbg(efx, probe, efx->net_dev, "initialising I/O\n");
1232

1233 1234
	bar = efx->type->mem_bar;

1235 1236
	rc = pci_enable_device(pci_dev);
	if (rc) {
1237 1238
		netif_err(efx, probe, efx->net_dev,
			  "failed to enable PCI device\n");
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
		goto fail1;
	}

	pci_set_master(pci_dev);

	/* Set the PCI DMA mask.  Try all possibilities from our
	 * genuine mask down to 32 bits, because some architectures
	 * (e.g. x86_64 with iommu_sac_force set) will allow 40 bit
	 * masks event though they reject 46 bit masks.
	 */
	while (dma_mask > 0x7fffffffUL) {
1250
		if (dma_supported(&pci_dev->dev, dma_mask)) {
1251
			rc = dma_set_mask_and_coherent(&pci_dev->dev, dma_mask);
1252 1253 1254
			if (rc == 0)
				break;
		}
1255 1256 1257
		dma_mask >>= 1;
	}
	if (rc) {
1258 1259
		netif_err(efx, probe, efx->net_dev,
			  "could not find a suitable DMA mask\n");
1260 1261
		goto fail2;
	}
1262 1263
	netif_dbg(efx, probe, efx->net_dev,
		  "using DMA mask %llx\n", (unsigned long long) dma_mask);
1264

1265 1266
	efx->membase_phys = pci_resource_start(efx->pci_dev, bar);
	rc = pci_request_region(pci_dev, bar, "sfc");
1267
	if (rc) {
1268 1269
		netif_err(efx, probe, efx->net_dev,
			  "request for memory BAR failed\n");
1270 1271 1272
		rc = -EIO;
		goto fail3;
	}
1273
	efx->membase = ioremap_nocache(efx->membase_phys, mem_map_size);
1274
	if (!efx->membase) {
1275 1276
		netif_err(efx, probe, efx->net_dev,
			  "could not map memory BAR at %llx+%x\n",
1277
			  (unsigned long long)efx->membase_phys, mem_map_size);
1278 1279 1280
		rc = -ENOMEM;
		goto fail4;
	}
1281 1282
	netif_dbg(efx, probe, efx->net_dev,
		  "memory BAR at %llx+%x (virtual %p)\n",
1283 1284
		  (unsigned long long)efx->membase_phys, mem_map_size,
		  efx->membase);
1285 1286 1287 1288

	return 0;

 fail4:
1289
	pci_release_region(efx->pci_dev, bar);
1290
 fail3:
1291
	efx->membase_phys = 0;
1292 1293 1294 1295 1296 1297 1298 1299
 fail2:
	pci_disable_device(efx->pci_dev);
 fail1:
	return rc;
}

static void efx_fini_io(struct efx_nic *efx)
{
1300 1301
	int bar;

1302
	netif_dbg(efx, drv, efx->net_dev, "shutting down I/O\n");
1303 1304 1305 1306 1307 1308 1309

	if (efx->membase) {
		iounmap(efx->membase);
		efx->membase = NULL;
	}

	if (efx->membase_phys) {
1310 1311
		bar = efx->type->mem_bar;
		pci_release_region(efx->pci_dev, bar);
1312
		efx->membase_phys = 0;
1313 1314
	}

1315 1316 1317
	/* Don't disable bus-mastering if VFs are assigned */
	if (!pci_vfs_assigned(efx->pci_dev))
		pci_disable_device(efx->pci_dev);
1318 1319
}

1320 1321 1322 1323 1324 1325 1326
void efx_set_default_rx_indir_table(struct efx_nic *efx)
{
	size_t i;

	for (i = 0; i < ARRAY_SIZE(efx->rx_indir_table); i++)
		efx->rx_indir_table[i] =
			ethtool_rxfh_indir_default(i, efx->rss_spread);
1327 1328
}

1329
static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
1330
{
1331
	cpumask_var_t thread_mask;
1332
	unsigned int count;
1333
	int cpu;
1334

1335 1336 1337 1338 1339 1340 1341 1342
	if (rss_cpus) {
		count = rss_cpus;
	} else {
		if (unlikely(!zalloc_cpumask_var(&thread_mask, GFP_KERNEL))) {
			netif_warn(efx, probe, efx->net_dev,
				   "RSS disabled due to allocation failure\n");
			return 1;
		}
1343

1344 1345 1346 1347 1348
		count = 0;
		for_each_online_cpu(cpu) {
			if (!cpumask_test_cpu(cpu, thread_mask)) {
				++count;
				cpumask_or(thread_mask, thread_mask,
1349
					   topology_sibling_cpumask(cpu));
1350 1351 1352 1353
			}
		}

		free_cpumask_var(thread_mask);
R
Rusty Russell 已提交
1354 1355
	}

1356 1357 1358
	/* If RSS is requested for the PF *and* VFs then we can't write RSS
	 * table entries that are inaccessible to VFs
	 */
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369
#ifdef CONFIG_SFC_SRIOV
	if (efx->type->sriov_wanted) {
		if (efx->type->sriov_wanted(efx) && efx_vf_size(efx) > 1 &&
		    count > efx_vf_size(efx)) {
			netif_warn(efx, probe, efx->net_dev,
				   "Reducing number of RSS channels from %u to %u for "
				   "VF support. Increase vf-msix-limit to use more "
				   "channels on the PF.\n",
				   count, efx_vf_size(efx));
			count = efx_vf_size(efx);
		}
1370
	}
1371
#endif
1372 1373 1374 1375 1376 1377 1378

	return count;
}

/* Probe the number and type of interrupts we are able to obtain, and
 * the resulting numbers of channels and RX queues.
 */
1379
static int efx_probe_interrupts(struct efx_nic *efx)
1380
{
1381 1382
	unsigned int extra_channels = 0;
	unsigned int i, j;
1383
	int rc;
1384

1385 1386 1387 1388
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++)
		if (efx->extra_channel_type[i])
			++extra_channels;

1389
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
1390
		struct msix_entry xentries[EFX_MAX_CHANNELS];
1391
		unsigned int n_channels;
1392

1393
		n_channels = efx_wanted_parallelism(efx);
1394
		if (efx_separate_tx_channels)
B
Ben Hutchings 已提交
1395
			n_channels *= 2;
1396
		n_channels += extra_channels;
1397
		n_channels = min(n_channels, efx->max_channels);
1398

B
Ben Hutchings 已提交
1399
		for (i = 0; i < n_channels; i++)
1400
			xentries[i].entry = i;
1401 1402 1403 1404 1405 1406 1407 1408
		rc = pci_enable_msix_range(efx->pci_dev,
					   xentries, 1, n_channels);
		if (rc < 0) {
			/* Fall back to single channel MSI */
			efx->interrupt_mode = EFX_INT_MODE_MSI;
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI-X\n");
		} else if (rc < n_channels) {
1409 1410
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Insufficient MSI-X vectors"
1411
				  " available (%d < %u).\n", rc, n_channels);
1412 1413
			netif_err(efx, drv, efx->net_dev,
				  "WARNING: Performance may be reduced.\n");
B
Ben Hutchings 已提交
1414
			n_channels = rc;
1415 1416
		}

1417
		if (rc > 0) {
B
Ben Hutchings 已提交
1418
			efx->n_channels = n_channels;
1419 1420
			if (n_channels > extra_channels)
				n_channels -= extra_channels;
1421 1422 1423 1424
			if (efx_separate_tx_channels) {
				efx->n_tx_channels = min(max(n_channels / 2,
							     1U),
							 efx->max_tx_channels);
1425 1426 1427
				efx->n_rx_channels = max(n_channels -
							 efx->n_tx_channels,
							 1U);
B
Ben Hutchings 已提交
1428
			} else {
1429 1430
				efx->n_tx_channels = min(n_channels,
							 efx->max_tx_channels);
1431
				efx->n_rx_channels = n_channels;
B
Ben Hutchings 已提交
1432
			}
1433
			for (i = 0; i < efx->n_channels; i++)
1434 1435
				efx_get_channel(efx, i)->irq =
					xentries[i].vector;
1436 1437 1438 1439 1440
		}
	}

	/* Try single interrupt MSI */
	if (efx->interrupt_mode == EFX_INT_MODE_MSI) {
1441
		efx->n_channels = 1;
B
Ben Hutchings 已提交
1442 1443
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1444 1445
		rc = pci_enable_msi(efx->pci_dev);
		if (rc == 0) {
1446
			efx_get_channel(efx, 0)->irq = efx->pci_dev->irq;
1447
		} else {
1448 1449
			netif_err(efx, drv, efx->net_dev,
				  "could not enable MSI\n");
1450 1451 1452 1453 1454 1455
			efx->interrupt_mode = EFX_INT_MODE_LEGACY;
		}
	}

	/* Assume legacy interrupts */
	if (efx->interrupt_mode == EFX_INT_MODE_LEGACY) {
1456
		efx->n_channels = 1 + (efx_separate_tx_channels ? 1 : 0);
B
Ben Hutchings 已提交
1457 1458
		efx->n_rx_channels = 1;
		efx->n_tx_channels = 1;
1459 1460
		efx->legacy_irq = efx->pci_dev->irq;
	}
1461

1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
	/* Assign extra channels if possible */
	j = efx->n_channels;
	for (i = 0; i < EFX_MAX_EXTRA_CHANNELS; i++) {
		if (!efx->extra_channel_type[i])
			continue;
		if (efx->interrupt_mode != EFX_INT_MODE_MSIX ||
		    efx->n_channels <= extra_channels) {
			efx->extra_channel_type[i]->handle_no_channel(efx);
		} else {
			--j;
			efx_get_channel(efx, j)->type =
				efx->extra_channel_type[i];
		}
	}

1477
	/* RSS might be usable on VFs even if it is disabled on the PF */
1478 1479 1480 1481 1482 1483 1484 1485 1486
#ifdef CONFIG_SFC_SRIOV
	if (efx->type->sriov_wanted) {
		efx->rss_spread = ((efx->n_rx_channels > 1 ||
				    !efx->type->sriov_wanted(efx)) ?
				   efx->n_rx_channels : efx_vf_size(efx));
		return 0;
	}
#endif
	efx->rss_spread = efx->n_rx_channels;
1487

1488
	return 0;
1489 1490
}

1491
static int efx_soft_enable_interrupts(struct efx_nic *efx)
1492
{
1493 1494
	struct efx_channel *channel, *end_channel;
	int rc;
1495

1496 1497
	BUG_ON(efx->state == STATE_DISABLED);

B
Ben Hutchings 已提交
1498 1499
	efx->irq_soft_enabled = true;
	smp_wmb();
1500 1501

	efx_for_each_channel(channel, efx) {
1502 1503 1504 1505 1506
		if (!channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
1507 1508 1509 1510
		efx_start_eventq(channel);
	}

	efx_mcdi_mode_event(efx);
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523

	return 0;
fail:
	end_channel = channel;
	efx_for_each_channel(channel, efx) {
		if (channel == end_channel)
			break;
		efx_stop_eventq(channel);
		if (!channel->type->keep_eventq)
			efx_fini_eventq(channel);
	}

	return rc;
1524 1525
}

B
Ben Hutchings 已提交
1526
static void efx_soft_disable_interrupts(struct efx_nic *efx)
1527 1528 1529
{
	struct efx_channel *channel;

1530 1531 1532
	if (efx->state == STATE_DISABLED)
		return;

1533 1534
	efx_mcdi_mode_poll(efx);

B
Ben Hutchings 已提交
1535 1536 1537 1538
	efx->irq_soft_enabled = false;
	smp_wmb();

	if (efx->legacy_irq)
1539 1540 1541 1542 1543 1544 1545
		synchronize_irq(efx->legacy_irq);

	efx_for_each_channel(channel, efx) {
		if (channel->irq)
			synchronize_irq(channel->irq);

		efx_stop_eventq(channel);
B
Ben Hutchings 已提交
1546
		if (!channel->type->keep_eventq)
1547
			efx_fini_eventq(channel);
1548
	}
1549 1550 1551

	/* Flush the asynchronous MCDI request queue */
	efx_mcdi_flush_async(efx);
1552 1553
}

1554
static int efx_enable_interrupts(struct efx_nic *efx)
B
Ben Hutchings 已提交
1555
{
1556 1557
	struct efx_channel *channel, *end_channel;
	int rc;
B
Ben Hutchings 已提交
1558 1559 1560 1561 1562 1563 1564 1565

	BUG_ON(efx->state == STATE_DISABLED);

	if (efx->eeh_disabled_legacy_irq) {
		enable_irq(efx->legacy_irq);
		efx->eeh_disabled_legacy_irq = false;
	}

1566
	efx->type->irq_enable_master(efx);
B
Ben Hutchings 已提交
1567 1568

	efx_for_each_channel(channel, efx) {
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
		if (channel->type->keep_eventq) {
			rc = efx_init_eventq(channel);
			if (rc)
				goto fail;
		}
	}

	rc = efx_soft_enable_interrupts(efx);
	if (rc)
		goto fail;

	return 0;

fail:
	end_channel = channel;
	efx_for_each_channel(channel, efx) {
		if (channel == end_channel)
			break;
B
Ben Hutchings 已提交
1587
		if (channel->type->keep_eventq)
1588
			efx_fini_eventq(channel);
B
Ben Hutchings 已提交
1589 1590
	}

1591 1592 1593
	efx->type->irq_disable_non_ev(efx);

	return rc;
B
Ben Hutchings 已提交
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
}

static void efx_disable_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	efx_soft_disable_interrupts(efx);

	efx_for_each_channel(channel, efx) {
		if (channel->type->keep_eventq)
			efx_fini_eventq(channel);
	}

1607
	efx->type->irq_disable_non_ev(efx);
B
Ben Hutchings 已提交
1608 1609
}

1610 1611 1612 1613 1614
static void efx_remove_interrupts(struct efx_nic *efx)
{
	struct efx_channel *channel;

	/* Remove MSI/MSI-X interrupts */
1615
	efx_for_each_channel(channel, efx)
1616 1617 1618 1619 1620 1621 1622 1623
		channel->irq = 0;
	pci_disable_msi(efx->pci_dev);
	pci_disable_msix(efx->pci_dev);

	/* Remove legacy interrupt */
	efx->legacy_irq = 0;
}

1624
static void efx_set_channels(struct efx_nic *efx)
1625
{
1626 1627 1628
	struct efx_channel *channel;
	struct efx_tx_queue *tx_queue;

1629
	efx->tx_channel_offset =
1630 1631
		efx_separate_tx_channels ?
		efx->n_channels - efx->n_tx_channels : 0;
1632

1633 1634
	/* We need to mark which channels really have RX and TX
	 * queues, and adjust the TX queue numbers if we have separate
1635 1636 1637
	 * RX-only and TX-only channels.
	 */
	efx_for_each_channel(channel, efx) {
1638 1639 1640 1641 1642
		if (channel->channel < efx->n_rx_channels)
			channel->rx_queue.core_index = channel->channel;
		else
			channel->rx_queue.core_index = -1;

1643 1644 1645 1646
		efx_for_each_channel_tx_queue(tx_queue, channel)
			tx_queue->queue -= (efx->tx_channel_offset *
					    EFX_TXQ_TYPES);
	}
1647 1648 1649 1650 1651 1652
}

static int efx_probe_nic(struct efx_nic *efx)
{
	int rc;

1653
	netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
1654 1655

	/* Carry out hardware-type specific initialisation */
1656
	rc = efx->type->probe(efx);
1657 1658 1659
	if (rc)
		return rc;

1660 1661 1662 1663 1664 1665 1666 1667
	do {
		if (!efx->max_channels || !efx->max_tx_channels) {
			netif_err(efx, drv, efx->net_dev,
				  "Insufficient resources to allocate"
				  " any channels\n");
			rc = -ENOSPC;
			goto fail1;
		}
1668

1669 1670 1671 1672 1673 1674
		/* Determine the number of channels and queues by trying
		 * to hook in MSI-X interrupts.
		 */
		rc = efx_probe_interrupts(efx);
		if (rc)
			goto fail1;
1675

1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
		efx_set_channels(efx);

		/* dimension_resources can fail with EAGAIN */
		rc = efx->type->dimension_resources(efx);
		if (rc != 0 && rc != -EAGAIN)
			goto fail2;

		if (rc == -EAGAIN)
			/* try again with new max_channels */
			efx_remove_interrupts(efx);

	} while (rc == -EAGAIN);
1688

1689
	if (efx->n_channels > 1)
1690 1691 1692
		netdev_rss_key_fill(&efx->rx_hash_key,
				    sizeof(efx->rx_hash_key));
	efx_set_default_rx_indir_table(efx);
1693

1694 1695
	netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels);
	netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels);
1696 1697

	/* Initialise the interrupt moderation settings */
1698 1699
	efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
				true);
1700 1701

	return 0;
1702

1703 1704 1705
fail2:
	efx_remove_interrupts(efx);
fail1:
1706 1707
	efx->type->remove(efx);
	return rc;
1708 1709 1710 1711
}

static void efx_remove_nic(struct efx_nic *efx)
{
1712
	netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
1713 1714

	efx_remove_interrupts(efx);
1715
	efx->type->remove(efx);
1716 1717
}

1718 1719 1720 1721 1722
static int efx_probe_filters(struct efx_nic *efx)
{
	int rc;

	spin_lock_init(&efx->filter_lock);
1723 1724
	init_rwsem(&efx->filter_sem);
	down_write(&efx->filter_sem);
1725 1726
	rc = efx->type->filter_table_probe(efx);
	if (rc)
1727
		goto out_unlock;
1728 1729 1730 1731 1732 1733 1734 1735

#ifdef CONFIG_RFS_ACCEL
	if (efx->type->offload_features & NETIF_F_NTUPLE) {
		efx->rps_flow_id = kcalloc(efx->type->max_rx_ip_filters,
					   sizeof(*efx->rps_flow_id),
					   GFP_KERNEL);
		if (!efx->rps_flow_id) {
			efx->type->filter_table_remove(efx);
1736 1737
			rc = -ENOMEM;
			goto out_unlock;
1738 1739 1740
		}
	}
#endif
1741 1742 1743
out_unlock:
	up_write(&efx->filter_sem);
	return rc;
1744 1745 1746 1747 1748 1749 1750
}

static void efx_remove_filters(struct efx_nic *efx)
{
#ifdef CONFIG_RFS_ACCEL
	kfree(efx->rps_flow_id);
#endif
1751
	down_write(&efx->filter_sem);
1752
	efx->type->filter_table_remove(efx);
1753
	up_write(&efx->filter_sem);
1754 1755 1756 1757
}

static void efx_restore_filters(struct efx_nic *efx)
{
1758
	down_read(&efx->filter_sem);
1759
	efx->type->filter_table_restore(efx);
1760
	up_read(&efx->filter_sem);
1761 1762
}

1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
/**************************************************************************
 *
 * NIC startup/shutdown
 *
 *************************************************************************/

static int efx_probe_all(struct efx_nic *efx)
{
	int rc;

	rc = efx_probe_nic(efx);
	if (rc) {
1775
		netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
1776 1777 1778 1779 1780
		goto fail1;
	}

	rc = efx_probe_port(efx);
	if (rc) {
1781
		netif_err(efx, probe, efx->net_dev, "failed to create port\n");
1782 1783 1784
		goto fail2;
	}

1785 1786 1787 1788 1789
	BUILD_BUG_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_RXQ_MIN_ENT);
	if (WARN_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_TXQ_MIN_ENT(efx))) {
		rc = -EINVAL;
		goto fail3;
	}
1790
	efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
1791

1792 1793 1794 1795 1796 1797 1798 1799
#ifdef CONFIG_SFC_SRIOV
	rc = efx->type->vswitching_probe(efx);
	if (rc) /* not fatal; the PF will still work fine */
		netif_warn(efx, probe, efx->net_dev,
			   "failed to setup vswitching rc=%d;"
			   " VFs may not function\n", rc);
#endif

B
Ben Hutchings 已提交
1800 1801 1802 1803
	rc = efx_probe_filters(efx);
	if (rc) {
		netif_err(efx, probe, efx->net_dev,
			  "failed to create filter tables\n");
1804
		goto fail4;
B
Ben Hutchings 已提交
1805 1806
	}

1807 1808
	rc = efx_probe_channels(efx);
	if (rc)
1809
		goto fail5;
1810

1811 1812
	return 0;

1813
 fail5:
1814
	efx_remove_filters(efx);
1815 1816 1817 1818
 fail4:
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1819 1820 1821 1822 1823 1824 1825 1826
 fail3:
	efx_remove_port(efx);
 fail2:
	efx_remove_nic(efx);
 fail1:
	return rc;
}

1827 1828 1829 1830 1831 1832
/* If the interface is supposed to be running but is not, start
 * the hardware and software data path, regular activity for the port
 * (MAC statistics, link polling, etc.) and schedule the port to be
 * reconfigured.  Interrupts must already be enabled.  This function
 * is safe to call multiple times, so long as the NIC is not disabled.
 * Requires the RTNL lock.
1833
 */
1834 1835 1836
static void efx_start_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);
1837
	BUG_ON(efx->state == STATE_DISABLED);
1838 1839 1840

	/* Check that it is appropriate to restart the interface. All
	 * of these flags are safe to read under just the rtnl lock */
1841 1842
	if (efx->port_enabled || !netif_running(efx->net_dev) ||
	    efx->reset_pending)
1843 1844 1845
		return;

	efx_start_port(efx);
1846
	efx_start_datapath(efx);
1847

1848 1849
	/* Start the hardware monitor if there is one */
	if (efx->type->monitor != NULL)
1850 1851
		queue_delayed_work(efx->workqueue, &efx->monitor_work,
				   efx_monitor_interval);
1852 1853 1854 1855 1856

	/* If link state detection is normally event-driven, we have
	 * to poll now because we could have missed a change
	 */
	if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0) {
1857 1858 1859 1860 1861
		mutex_lock(&efx->mac_lock);
		if (efx->phy_op->poll(efx))
			efx_link_status_changed(efx);
		mutex_unlock(&efx->mac_lock);
	}
1862

1863
	efx->type->start_stats(efx);
1864 1865 1866 1867
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1868 1869
}

1870 1871 1872 1873 1874
/* Quiesce the hardware and software data path, and regular activity
 * for the port without bringing the link down.  Safe to call multiple
 * times with the NIC in almost any state, but interrupts should be
 * enabled.  Requires the RTNL lock.
 */
1875 1876 1877 1878 1879 1880 1881 1882
static void efx_stop_all(struct efx_nic *efx)
{
	EFX_ASSERT_RESET_SERIALISED(efx);

	/* port_enabled can be read safely under the rtnl lock */
	if (!efx->port_enabled)
		return;

1883 1884 1885 1886 1887 1888 1889
	/* update stats before we go down so we can accurately count
	 * rx_nodesc_drops
	 */
	efx->type->pull_stats(efx);
	spin_lock_bh(&efx->stats_lock);
	efx->type->update_stats(efx, NULL, NULL);
	spin_unlock_bh(&efx->stats_lock);
1890
	efx->type->stop_stats(efx);
1891 1892
	efx_stop_port(efx);

1893 1894 1895 1896 1897 1898
	/* Stop the kernel transmit interface.  This is only valid if
	 * the device is stopped or detached; otherwise the watchdog
	 * may fire immediately.
	 */
	WARN_ON(netif_running(efx->net_dev) &&
		netif_device_present(efx->net_dev));
1899 1900 1901
	netif_tx_disable(efx->net_dev);

	efx_stop_datapath(efx);
1902 1903 1904 1905
}

static void efx_remove_all(struct efx_nic *efx)
{
1906
	efx_remove_channels(efx);
1907
	efx_remove_filters(efx);
1908 1909 1910
#ifdef CONFIG_SFC_SRIOV
	efx->type->vswitching_remove(efx);
#endif
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
	efx_remove_port(efx);
	efx_remove_nic(efx);
}

/**************************************************************************
 *
 * Interrupt moderation
 *
 **************************************************************************/

1921
static unsigned int irq_mod_ticks(unsigned int usecs, unsigned int quantum_ns)
1922
{
1923 1924
	if (usecs == 0)
		return 0;
1925
	if (usecs * 1000 < quantum_ns)
1926
		return 1; /* never round down to 0 */
1927
	return usecs * 1000 / quantum_ns;
1928 1929
}

1930
/* Set interrupt moderation parameters */
1931 1932 1933
int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
			    unsigned int rx_usecs, bool rx_adaptive,
			    bool rx_may_override_tx)
1934
{
1935
	struct efx_channel *channel;
1936 1937 1938 1939 1940
	unsigned int irq_mod_max = DIV_ROUND_UP(efx->type->timer_period_max *
						efx->timer_quantum_ns,
						1000);
	unsigned int tx_ticks;
	unsigned int rx_ticks;
1941 1942 1943

	EFX_ASSERT_RESET_SERIALISED(efx);

1944
	if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
1945 1946
		return -EINVAL;

1947 1948 1949
	tx_ticks = irq_mod_ticks(tx_usecs, efx->timer_quantum_ns);
	rx_ticks = irq_mod_ticks(rx_usecs, efx->timer_quantum_ns);

1950 1951 1952 1953 1954 1955 1956
	if (tx_ticks != rx_ticks && efx->tx_channel_offset == 0 &&
	    !rx_may_override_tx) {
		netif_err(efx, drv, efx->net_dev, "Channels are shared. "
			  "RX and TX IRQ moderation must be equal\n");
		return -EINVAL;
	}

1957
	efx->irq_rx_adaptive = rx_adaptive;
1958
	efx->irq_rx_moderation = rx_ticks;
1959
	efx_for_each_channel(channel, efx) {
1960
		if (efx_channel_has_rx_queue(channel))
1961
			channel->irq_moderation = rx_ticks;
1962
		else if (efx_channel_has_tx_queues(channel))
1963 1964
			channel->irq_moderation = tx_ticks;
	}
1965 1966

	return 0;
1967 1968
}

1969 1970 1971
void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
			    unsigned int *rx_usecs, bool *rx_adaptive)
{
1972 1973 1974 1975
	/* We must round up when converting ticks to microseconds
	 * because we round down when converting the other way.
	 */

1976
	*rx_adaptive = efx->irq_rx_adaptive;
1977 1978 1979
	*rx_usecs = DIV_ROUND_UP(efx->irq_rx_moderation *
				 efx->timer_quantum_ns,
				 1000);
1980 1981 1982 1983 1984 1985 1986 1987

	/* If channels are shared between RX and TX, so is IRQ
	 * moderation.  Otherwise, IRQ moderation is the same for all
	 * TX channels and is not adaptive.
	 */
	if (efx->tx_channel_offset == 0)
		*tx_usecs = *rx_usecs;
	else
1988
		*tx_usecs = DIV_ROUND_UP(
1989
			efx->channel[efx->tx_channel_offset]->irq_moderation *
1990 1991
			efx->timer_quantum_ns,
			1000);
1992 1993
}

1994 1995 1996 1997 1998 1999
/**************************************************************************
 *
 * Hardware monitor
 *
 **************************************************************************/

2000
/* Run periodically off the general workqueue */
2001 2002 2003 2004 2005
static void efx_monitor(struct work_struct *data)
{
	struct efx_nic *efx = container_of(data, struct efx_nic,
					   monitor_work.work);

2006 2007 2008
	netif_vdbg(efx, timer, efx->net_dev,
		   "hardware monitor executing on CPU %d\n",
		   raw_smp_processor_id());
2009
	BUG_ON(efx->type->monitor == NULL);
2010 2011 2012

	/* If the mac_lock is already held then it is likely a port
	 * reconfiguration is already in place, which will likely do
2013 2014 2015 2016 2017 2018
	 * most of the work of monitor() anyway. */
	if (mutex_trylock(&efx->mac_lock)) {
		if (efx->port_enabled)
			efx->type->monitor(efx);
		mutex_unlock(&efx->mac_lock);
	}
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034

	queue_delayed_work(efx->workqueue, &efx->monitor_work,
			   efx_monitor_interval);
}

/**************************************************************************
 *
 * ioctls
 *
 *************************************************************************/

/* Net device ioctl
 * Context: process, rtnl_lock() held.
 */
static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
{
2035
	struct efx_nic *efx = netdev_priv(net_dev);
2036
	struct mii_ioctl_data *data = if_mii(ifr);
2037

2038
	if (cmd == SIOCSHWTSTAMP)
2039 2040 2041
		return efx_ptp_set_ts_config(efx, ifr);
	if (cmd == SIOCGHWTSTAMP)
		return efx_ptp_get_ts_config(efx, ifr);
2042

2043 2044 2045 2046 2047 2048
	/* Convert phy_id from older PRTAD/DEVAD format */
	if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) &&
	    (data->phy_id & 0xfc00) == 0x0400)
		data->phy_id ^= MDIO_PHY_ID_C45 | 0x0400;

	return mdio_mii_ioctl(&efx->mdio, data, cmd);
2049 2050 2051 2052 2053 2054 2055 2056
}

/**************************************************************************
 *
 * NAPI interface
 *
 **************************************************************************/

2057 2058 2059 2060 2061 2062 2063
static void efx_init_napi_channel(struct efx_channel *channel)
{
	struct efx_nic *efx = channel->efx;

	channel->napi_dev = efx->net_dev;
	netif_napi_add(channel->napi_dev, &channel->napi_str,
		       efx_poll, napi_weight);
2064 2065
	napi_hash_add(&channel->napi_str);
	efx_channel_init_lock(channel);
2066 2067
}

2068
static void efx_init_napi(struct efx_nic *efx)
2069 2070 2071
{
	struct efx_channel *channel;

2072 2073
	efx_for_each_channel(channel, efx)
		efx_init_napi_channel(channel);
2074 2075 2076 2077
}

static void efx_fini_napi_channel(struct efx_channel *channel)
{
2078
	if (channel->napi_dev) {
2079
		netif_napi_del(&channel->napi_str);
2080 2081
		napi_hash_del(&channel->napi_str);
	}
2082
	channel->napi_dev = NULL;
2083 2084 2085 2086 2087 2088
}

static void efx_fini_napi(struct efx_nic *efx)
{
	struct efx_channel *channel;

2089 2090
	efx_for_each_channel(channel, efx)
		efx_fini_napi_channel(channel);
2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
}

/**************************************************************************
 *
 * Kernel netpoll interface
 *
 *************************************************************************/

#ifdef CONFIG_NET_POLL_CONTROLLER

/* Although in the common case interrupts will be disabled, this is not
 * guaranteed. However, all our work happens inside the NAPI callback,
 * so no locking is required.
 */
static void efx_netpoll(struct net_device *net_dev)
{
2107
	struct efx_nic *efx = netdev_priv(net_dev);
2108 2109
	struct efx_channel *channel;

2110
	efx_for_each_channel(channel, efx)
2111 2112 2113 2114 2115
		efx_schedule_channel(channel);
}

#endif

2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
#ifdef CONFIG_NET_RX_BUSY_POLL
static int efx_busy_poll(struct napi_struct *napi)
{
	struct efx_channel *channel =
		container_of(napi, struct efx_channel, napi_str);
	struct efx_nic *efx = channel->efx;
	int budget = 4;
	int old_rx_packets, rx_packets;

	if (!netif_running(efx->net_dev))
		return LL_FLUSH_FAILED;

	if (!efx_channel_lock_poll(channel))
		return LL_FLUSH_BUSY;

	old_rx_packets = channel->rx_queue.rx_packets;
	efx_process_channel(channel, budget);

	rx_packets = channel->rx_queue.rx_packets - old_rx_packets;

	/* There is no race condition with NAPI here.
	 * NAPI will automatically be rescheduled if it yielded during busy
	 * polling, because it was not able to take the lock and thus returned
	 * the full budget.
	 */
	efx_channel_unlock_poll(channel);

	return rx_packets;
}
#endif

2147 2148 2149 2150 2151 2152 2153
/**************************************************************************
 *
 * Kernel net device interface
 *
 *************************************************************************/

/* Context: process, rtnl_lock() held. */
2154
int efx_net_open(struct net_device *net_dev)
2155
{
2156
	struct efx_nic *efx = netdev_priv(net_dev);
2157 2158
	int rc;

2159 2160
	netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
		  raw_smp_processor_id());
2161

2162 2163 2164
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2165 2166
	if (efx->phy_mode & PHY_MODE_SPECIAL)
		return -EBUSY;
2167 2168
	if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
		return -EIO;
2169

2170 2171 2172 2173
	/* Notify the kernel of the link state polled during driver load,
	 * before the monitor starts running */
	efx_link_status_changed(efx);

2174
	efx_start_all(efx);
2175
	efx_selftest_async_start(efx);
2176 2177 2178 2179 2180 2181 2182
	return 0;
}

/* Context: process, rtnl_lock() held.
 * Note that the kernel will ignore our return code; this method
 * should really be a void.
 */
2183
int efx_net_stop(struct net_device *net_dev)
2184
{
2185
	struct efx_nic *efx = netdev_priv(net_dev);
2186

2187 2188
	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
		  raw_smp_processor_id());
2189

2190 2191
	/* Stop the device and flush all the channels */
	efx_stop_all(efx);
2192 2193 2194 2195

	return 0;
}

2196
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
B
Ben Hutchings 已提交
2197 2198
static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev,
					       struct rtnl_link_stats64 *stats)
2199
{
2200
	struct efx_nic *efx = netdev_priv(net_dev);
2201

2202
	spin_lock_bh(&efx->stats_lock);
2203
	efx->type->update_stats(efx, NULL, stats);
2204 2205
	spin_unlock_bh(&efx->stats_lock);

2206 2207 2208 2209 2210 2211
	return stats;
}

/* Context: netif_tx_lock held, BHs disabled. */
static void efx_watchdog(struct net_device *net_dev)
{
2212
	struct efx_nic *efx = netdev_priv(net_dev);
2213

2214 2215 2216
	netif_err(efx, tx_err, efx->net_dev,
		  "TX stuck with port_enabled=%d: resetting channels\n",
		  efx->port_enabled);
2217

2218
	efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
2219 2220 2221 2222 2223 2224
}


/* Context: process, rtnl_lock() held. */
static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
{
2225
	struct efx_nic *efx = netdev_priv(net_dev);
2226
	int rc;
2227

2228 2229 2230
	rc = efx_check_disabled(efx);
	if (rc)
		return rc;
2231 2232 2233
	if (new_mtu > EFX_MAX_MTU)
		return -EINVAL;

2234
	netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);
2235

2236 2237 2238
	efx_device_detach_sync(efx);
	efx_stop_all(efx);

B
Ben Hutchings 已提交
2239
	mutex_lock(&efx->mac_lock);
2240
	net_dev->mtu = new_mtu;
2241
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2242 2243
	mutex_unlock(&efx->mac_lock);

2244
	efx_start_all(efx);
2245
	netif_device_attach(efx->net_dev);
2246
	return 0;
2247 2248 2249 2250
}

static int efx_set_mac_address(struct net_device *net_dev, void *data)
{
2251
	struct efx_nic *efx = netdev_priv(net_dev);
2252
	struct sockaddr *addr = data;
2253
	u8 *new_addr = addr->sa_data;
2254 2255
	u8 old_addr[6];
	int rc;
2256 2257

	if (!is_valid_ether_addr(new_addr)) {
2258 2259 2260
		netif_err(efx, drv, efx->net_dev,
			  "invalid ethernet MAC address requested: %pM\n",
			  new_addr);
2261
		return -EADDRNOTAVAIL;
2262 2263
	}

2264 2265
	/* save old address */
	ether_addr_copy(old_addr, net_dev->dev_addr);
2266
	ether_addr_copy(net_dev->dev_addr, new_addr);
2267 2268
	if (efx->type->set_mac_address) {
		rc = efx->type->set_mac_address(efx);
2269 2270 2271 2272 2273
		if (rc) {
			ether_addr_copy(net_dev->dev_addr, old_addr);
			return rc;
		}
	}
2274 2275

	/* Reconfigure the MAC */
B
Ben Hutchings 已提交
2276
	mutex_lock(&efx->mac_lock);
2277
	efx_mac_reconfigure(efx);
B
Ben Hutchings 已提交
2278
	mutex_unlock(&efx->mac_lock);
2279 2280 2281 2282

	return 0;
}

2283
/* Context: netif_addr_lock held, BHs disabled. */
2284
static void efx_set_rx_mode(struct net_device *net_dev)
2285
{
2286
	struct efx_nic *efx = netdev_priv(net_dev);
2287

2288 2289 2290
	if (efx->port_enabled)
		queue_work(efx->workqueue, &efx->mac_work);
	/* Otherwise efx_start_port() will do this */
2291 2292
}

2293
static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
2294 2295 2296 2297 2298
{
	struct efx_nic *efx = netdev_priv(net_dev);

	/* If disabling RX n-tuple filtering, clear existing filters */
	if (net_dev->features & ~data & NETIF_F_NTUPLE)
2299
		return efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
2300 2301 2302 2303

	return 0;
}

2304
static const struct net_device_ops efx_netdev_ops = {
S
Stephen Hemminger 已提交
2305 2306
	.ndo_open		= efx_net_open,
	.ndo_stop		= efx_net_stop,
2307
	.ndo_get_stats64	= efx_net_stats,
S
Stephen Hemminger 已提交
2308 2309 2310 2311 2312 2313
	.ndo_tx_timeout		= efx_watchdog,
	.ndo_start_xmit		= efx_hard_start_xmit,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_do_ioctl		= efx_ioctl,
	.ndo_change_mtu		= efx_change_mtu,
	.ndo_set_mac_address	= efx_set_mac_address,
2314
	.ndo_set_rx_mode	= efx_set_rx_mode,
2315
	.ndo_set_features	= efx_set_features,
2316
#ifdef CONFIG_SFC_SRIOV
2317 2318 2319 2320
	.ndo_set_vf_mac		= efx_sriov_set_vf_mac,
	.ndo_set_vf_vlan	= efx_sriov_set_vf_vlan,
	.ndo_set_vf_spoofchk	= efx_sriov_set_vf_spoofchk,
	.ndo_get_vf_config	= efx_sriov_get_vf_config,
2321
	.ndo_set_vf_link_state  = efx_sriov_set_vf_link_state,
2322
	.ndo_get_phys_port_id   = efx_sriov_get_phys_port_id,
2323
#endif
S
Stephen Hemminger 已提交
2324 2325 2326
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = efx_netpoll,
#endif
2327
	.ndo_setup_tc		= efx_setup_tc,
2328 2329 2330
#ifdef CONFIG_NET_RX_BUSY_POLL
	.ndo_busy_poll		= efx_busy_poll,
#endif
2331 2332 2333
#ifdef CONFIG_RFS_ACCEL
	.ndo_rx_flow_steer	= efx_filter_rfs,
#endif
S
Stephen Hemminger 已提交
2334 2335
};

2336 2337 2338 2339 2340 2341 2342
static void efx_update_name(struct efx_nic *efx)
{
	strcpy(efx->name, efx->net_dev->name);
	efx_mtd_rename(efx);
	efx_set_channel_names(efx);
}

2343 2344 2345
static int efx_netdev_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
2346
	struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
2347

2348
	if ((net_dev->netdev_ops == &efx_netdev_ops) &&
2349 2350
	    event == NETDEV_CHANGENAME)
		efx_update_name(netdev_priv(net_dev));
2351 2352 2353 2354 2355 2356 2357 2358

	return NOTIFY_DONE;
}

static struct notifier_block efx_netdev_notifier = {
	.notifier_call = efx_netdev_event,
};

B
Ben Hutchings 已提交
2359 2360 2361 2362 2363 2364
static ssize_t
show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
	return sprintf(buf, "%d\n", efx->phy_type);
}
2365
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
B
Ben Hutchings 已提交
2366

2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
#ifdef CONFIG_SFC_MCDI_LOGGING
static ssize_t show_mcdi_log(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);

	return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
}
static ssize_t set_mcdi_log(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
	bool enable = count > 0 && *buf != '0';

	mcdi->logging_enabled = enable;
	return count;
}
static DEVICE_ATTR(mcdi_logging, 0644, show_mcdi_log, set_mcdi_log);
#endif

2389 2390 2391
static int efx_register_netdev(struct efx_nic *efx)
{
	struct net_device *net_dev = efx->net_dev;
2392
	struct efx_channel *channel;
2393 2394 2395 2396
	int rc;

	net_dev->watchdog_timeo = 5 * HZ;
	net_dev->irq = efx->pci_dev->irq;
2397 2398
	net_dev->netdev_ops = &efx_netdev_ops;
	if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
2399
		net_dev->priv_flags |= IFF_UNICAST_FLT;
2400
	net_dev->ethtool_ops = &efx_ethtool_ops;
2401
	net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
2402

2403
	rtnl_lock();
2404

2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417
	/* Enable resets to be scheduled and check whether any were
	 * already requested.  If so, the NIC is probably hosed so we
	 * abort.
	 */
	efx->state = STATE_READY;
	smp_mb(); /* ensure we change state before checking reset_pending */
	if (efx->reset_pending) {
		netif_err(efx, probe, efx->net_dev,
			  "aborting probe due to scheduled reset\n");
		rc = -EIO;
		goto fail_locked;
	}

2418 2419 2420
	rc = dev_alloc_name(net_dev, net_dev->name);
	if (rc < 0)
		goto fail_locked;
2421
	efx_update_name(efx);
2422

2423 2424 2425
	/* Always start with carrier off; PHY events will detect the link */
	netif_carrier_off(net_dev);

2426 2427 2428 2429
	rc = register_netdevice(net_dev);
	if (rc)
		goto fail_locked;

2430 2431
	efx_for_each_channel(channel, efx) {
		struct efx_tx_queue *tx_queue;
2432 2433
		efx_for_each_channel_tx_queue(tx_queue, channel)
			efx_init_tx_queue_core_txq(tx_queue);
2434 2435
	}

2436 2437
	efx_associate(efx);

2438
	rtnl_unlock();
2439

B
Ben Hutchings 已提交
2440 2441
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
	if (rc) {
2442 2443
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
B
Ben Hutchings 已提交
2444 2445
		goto fail_registered;
	}
2446 2447 2448 2449 2450 2451 2452 2453
#ifdef CONFIG_SFC_MCDI_LOGGING
	rc = device_create_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
	if (rc) {
		netif_err(efx, drv, efx->net_dev,
			  "failed to init net dev attributes\n");
		goto fail_attr_mcdi_logging;
	}
#endif
B
Ben Hutchings 已提交
2454

2455
	return 0;
B
Ben Hutchings 已提交
2456

2457 2458 2459 2460
#ifdef CONFIG_SFC_MCDI_LOGGING
fail_attr_mcdi_logging:
	device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
#endif
2461 2462
fail_registered:
	rtnl_lock();
2463
	efx_dissociate(efx);
2464
	unregister_netdevice(net_dev);
2465
fail_locked:
2466
	efx->state = STATE_UNINIT;
2467
	rtnl_unlock();
2468
	netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
2469
	return rc;
2470 2471 2472 2473 2474 2475 2476
}

static void efx_unregister_netdev(struct efx_nic *efx)
{
	if (!efx->net_dev)
		return;

2477
	BUG_ON(netdev_priv(efx->net_dev) != efx);
2478

2479 2480 2481 2482 2483 2484 2485 2486
	if (efx_dev_registered(efx)) {
		strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
#ifdef CONFIG_SFC_MCDI_LOGGING
		device_remove_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
#endif
		device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
		unregister_netdev(efx->net_dev);
	}
2487 2488 2489 2490 2491 2492 2493 2494
}

/**************************************************************************
 *
 * Device reset and suspend
 *
 **************************************************************************/

B
Ben Hutchings 已提交
2495 2496
/* Tears down the entire software state and most of the hardware state
 * before reset.  */
B
Ben Hutchings 已提交
2497
void efx_reset_down(struct efx_nic *efx, enum reset_type method)
2498 2499 2500
{
	EFX_ASSERT_RESET_SERIALISED(efx);

2501 2502 2503
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->prepare_flr(efx);

B
Ben Hutchings 已提交
2504
	efx_stop_all(efx);
B
Ben Hutchings 已提交
2505
	efx_disable_interrupts(efx);
2506 2507

	mutex_lock(&efx->mac_lock);
2508 2509
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH)
2510
		efx->phy_op->fini(efx);
2511
	efx->type->fini(efx);
2512 2513
}

B
Ben Hutchings 已提交
2514 2515 2516 2517 2518
/* This function will always ensure that the locks acquired in
 * efx_reset_down() are released. A failure return code indicates
 * that we were unable to reinitialise the hardware, and the
 * driver should be disabled. If ok is false, then the rx and tx
 * engines are not restarted, pending a RESET_DISABLE. */
B
Ben Hutchings 已提交
2519
int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)
2520 2521 2522
{
	int rc;

B
Ben Hutchings 已提交
2523
	EFX_ASSERT_RESET_SERIALISED(efx);
2524

2525 2526 2527 2528
	if (method == RESET_TYPE_MCDI_TIMEOUT)
		efx->type->finish_flr(efx);

	/* Ensure that SRAM is initialised even if we're disabling the device */
2529
	rc = efx->type->init(efx);
2530
	if (rc) {
2531
		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");
2532
		goto fail;
2533 2534
	}

2535 2536 2537
	if (!ok)
		goto fail;

2538 2539
	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&
	    method != RESET_TYPE_DATAPATH) {
2540 2541 2542
		rc = efx->phy_op->init(efx);
		if (rc)
			goto fail;
2543 2544
		rc = efx->phy_op->reconfigure(efx);
		if (rc && rc != -EPERM)
2545 2546
			netif_err(efx, drv, efx->net_dev,
				  "could not restore PHY settings\n");
2547 2548
	}

2549 2550 2551
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail;
2552 2553 2554 2555 2556 2557 2558 2559 2560

#ifdef CONFIG_SFC_SRIOV
	rc = efx->type->vswitching_restore(efx);
	if (rc) /* not fatal; the PF will still work fine */
		netif_warn(efx, probe, efx->net_dev,
			   "failed to restore vswitching rc=%d;"
			   " VFs may not function\n", rc);
#endif

2561
	down_read(&efx->filter_sem);
B
Ben Hutchings 已提交
2562
	efx_restore_filters(efx);
2563
	up_read(&efx->filter_sem);
2564 2565
	if (efx->type->sriov_reset)
		efx->type->sriov_reset(efx);
2566 2567 2568 2569 2570 2571 2572 2573 2574

	mutex_unlock(&efx->mac_lock);

	efx_start_all(efx);

	return 0;

fail:
	efx->port_initialized = false;
B
Ben Hutchings 已提交
2575 2576 2577

	mutex_unlock(&efx->mac_lock);

2578 2579 2580
	return rc;
}

2581 2582
/* Reset the NIC using the specified method.  Note that the reset may
 * fail, in which case the card will be left in an unusable state.
2583
 *
2584
 * Caller must hold the rtnl_lock.
2585
 */
2586
int efx_reset(struct efx_nic *efx, enum reset_type method)
2587
{
2588 2589
	int rc, rc2;
	bool disabled;
2590

2591 2592
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",
		   RESET_TYPE(method));
2593

2594
	efx_device_detach_sync(efx);
B
Ben Hutchings 已提交
2595
	efx_reset_down(efx, method);
2596

2597
	rc = efx->type->reset(efx, method);
2598
	if (rc) {
2599
		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");
2600
		goto out;
2601 2602
	}

2603 2604 2605
	/* Clear flags for the scopes we covered.  We assume the NIC and
	 * driver are now quiescent so that there is no race here.
	 */
2606 2607 2608 2609
	if (method < RESET_TYPE_MAX_METHOD)
		efx->reset_pending &= -(1 << (method + 1));
	else /* it doesn't fit into the well-ordered scope hierarchy */
		__clear_bit(method, &efx->reset_pending);
2610 2611 2612 2613 2614 2615 2616

	/* Reinitialise bus-mastering, which may have been turned off before
	 * the reset was scheduled. This is still appropriate, even in the
	 * RESET_TYPE_DISABLE since this driver generally assumes the hardware
	 * can respond to requests. */
	pci_set_master(efx->pci_dev);

2617
out:
2618
	/* Leave device stopped if necessary */
2619 2620 2621
	disabled = rc ||
		method == RESET_TYPE_DISABLE ||
		method == RESET_TYPE_RECOVER_OR_DISABLE;
2622 2623 2624 2625 2626
	rc2 = efx_reset_up(efx, method, !disabled);
	if (rc2) {
		disabled = true;
		if (!rc)
			rc = rc2;
2627 2628
	}

2629
	if (disabled) {
2630
		dev_close(efx->net_dev);
2631
		netif_err(efx, drv, efx->net_dev, "has been disabled\n");
2632 2633
		efx->state = STATE_DISABLED;
	} else {
2634
		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
2635
		netif_device_attach(efx->net_dev);
2636
	}
2637 2638 2639
	return rc;
}

2640 2641 2642 2643 2644
/* Try recovery mechanisms.
 * For now only EEH is supported.
 * Returns 0 if the recovery mechanisms are unsuccessful.
 * Returns a non-zero value otherwise.
 */
2645
int efx_try_recovery(struct efx_nic *efx)
2646 2647 2648 2649 2650 2651 2652
{
#ifdef CONFIG_EEH
	/* A PCI error can occur and not be seen by EEH because nothing
	 * happens on the PCI bus. In this case the driver may fail and
	 * schedule a 'recover or reset', leading to this recovery handler.
	 * Manually call the eeh failure check function.
	 */
2653
	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);
2654 2655 2656 2657 2658 2659 2660 2661 2662 2663
	if (eeh_dev_check_failure(eehdev)) {
		/* The EEH mechanisms will handle the error and reset the
		 * device if necessary.
		 */
		return 1;
	}
#endif
	return 0;
}

2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681
static void efx_wait_for_bist_end(struct efx_nic *efx)
{
	int i;

	for (i = 0; i < BIST_WAIT_DELAY_COUNT; ++i) {
		if (efx_mcdi_poll_reboot(efx))
			goto out;
		msleep(BIST_WAIT_DELAY_MS);
	}

	netif_err(efx, drv, efx->net_dev, "Warning: No MC reboot after BIST mode\n");
out:
	/* Either way unset the BIST flag. If we found no reboot we probably
	 * won't recover, but we should try.
	 */
	efx->mc_bist_for_other_fn = false;
}

2682 2683 2684 2685 2686
/* The worker thread exists so that code that cannot sleep can
 * schedule a reset for later.
 */
static void efx_reset_work(struct work_struct *data)
{
2687
	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
2688 2689 2690 2691 2692 2693
	unsigned long pending;
	enum reset_type method;

	pending = ACCESS_ONCE(efx->reset_pending);
	method = fls(pending) - 1;

2694 2695 2696
	if (method == RESET_TYPE_MC_BIST)
		efx_wait_for_bist_end(efx);

2697 2698 2699 2700
	if ((method == RESET_TYPE_RECOVER_OR_DISABLE ||
	     method == RESET_TYPE_RECOVER_OR_ALL) &&
	    efx_try_recovery(efx))
		return;
2701

2702
	if (!pending)
2703 2704
		return;

2705
	rtnl_lock();
2706 2707 2708 2709 2710 2711

	/* We checked the state in efx_schedule_reset() but it may
	 * have changed by now.  Now that we have the RTNL lock,
	 * it cannot change again.
	 */
	if (efx->state == STATE_READY)
2712
		(void)efx_reset(efx, method);
2713

2714
	rtnl_unlock();
2715 2716 2717 2718 2719 2720
}

void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)
{
	enum reset_type method;

2721 2722 2723 2724 2725 2726 2727
	if (efx->state == STATE_RECOVERY) {
		netif_dbg(efx, drv, efx->net_dev,
			  "recovering: skip scheduling %s reset\n",
			  RESET_TYPE(type));
		return;
	}

2728 2729 2730
	switch (type) {
	case RESET_TYPE_INVISIBLE:
	case RESET_TYPE_ALL:
2731
	case RESET_TYPE_RECOVER_OR_ALL:
2732 2733
	case RESET_TYPE_WORLD:
	case RESET_TYPE_DISABLE:
2734
	case RESET_TYPE_RECOVER_OR_DISABLE:
2735
	case RESET_TYPE_DATAPATH:
2736
	case RESET_TYPE_MC_BIST:
2737
	case RESET_TYPE_MCDI_TIMEOUT:
2738
		method = type;
2739 2740
		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",
			  RESET_TYPE(method));
2741 2742
		break;
	default:
2743
		method = efx->type->map_reset_reason(type);
2744 2745 2746
		netif_dbg(efx, drv, efx->net_dev,
			  "scheduling %s reset for %s\n",
			  RESET_TYPE(method), RESET_TYPE(type));
2747 2748
		break;
	}
2749

2750
	set_bit(method, &efx->reset_pending);
2751 2752 2753 2754 2755 2756 2757
	smp_mb(); /* ensure we change reset_pending before checking state */

	/* If we're not READY then just leave the flags set as the cue
	 * to abort probing or reschedule the reset later.
	 */
	if (ACCESS_ONCE(efx->state) != STATE_READY)
		return;
2758

2759 2760 2761 2762
	/* efx_process_channel() will no longer read events once a
	 * reset is scheduled. So switch back to poll'd MCDI completions. */
	efx_mcdi_mode_poll(efx);

2763
	queue_work(reset_workqueue, &efx->reset_work);
2764 2765 2766 2767 2768 2769 2770 2771 2772
}

/**************************************************************************
 *
 * List of NICs we support
 *
 **************************************************************************/

/* PCI device ID table */
2773
static const struct pci_device_id efx_pci_table[] = {
2774 2775
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000A_0),
2776
	 .driver_data = (unsigned long) &falcon_a1_nic_type},
2777 2778
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE,
		    PCI_DEVICE_ID_SOLARFLARE_SFC4000B),
2779
	 .driver_data = (unsigned long) &falcon_b0_nic_type},
2780
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803),	/* SFC9020 */
2781
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2782
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813),	/* SFL9021 */
2783
	 .driver_data = (unsigned long) &siena_a0_nic_type},
2784 2785
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903),  /* SFC9120 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2786 2787
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903),  /* SFC9120 VF */
	 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
2788 2789
	{PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923),  /* SFC9140 PF */
	 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
2790 2791 2792 2793 2794
	{0}			/* end of list */
};

/**************************************************************************
 *
2795
 * Dummy PHY/MAC operations
2796
 *
2797
 * Can be used for some unimplemented operations
2798 2799 2800 2801 2802 2803 2804 2805 2806
 * Needed so all function pointers are valid and do not have to be tested
 * before use
 *
 **************************************************************************/
int efx_port_dummy_op_int(struct efx_nic *efx)
{
	return 0;
}
void efx_port_dummy_op_void(struct efx_nic *efx) {}
S
stephen hemminger 已提交
2807 2808

static bool efx_port_dummy_op_poll(struct efx_nic *efx)
S
Steve Hodgson 已提交
2809 2810 2811
{
	return false;
}
2812

2813
static const struct efx_phy_operations efx_dummy_phy_operations = {
2814
	.init		 = efx_port_dummy_op_int,
B
Ben Hutchings 已提交
2815
	.reconfigure	 = efx_port_dummy_op_int,
S
Steve Hodgson 已提交
2816
	.poll		 = efx_port_dummy_op_poll,
2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
	.fini		 = efx_port_dummy_op_void,
};

/**************************************************************************
 *
 * Data housekeeping
 *
 **************************************************************************/

/* This zeroes out and then fills in the invariants in a struct
 * efx_nic (including all sub-structures).
 */
2829
static int efx_init_struct(struct efx_nic *efx,
2830 2831
			   struct pci_dev *pci_dev, struct net_device *net_dev)
{
2832
	int i;
2833 2834

	/* Initialise common structures */
2835 2836
	INIT_LIST_HEAD(&efx->node);
	INIT_LIST_HEAD(&efx->secondary_list);
2837
	spin_lock_init(&efx->biu_lock);
2838 2839 2840
#ifdef CONFIG_SFC_MTD
	INIT_LIST_HEAD(&efx->mtd_list);
#endif
2841 2842
	INIT_WORK(&efx->reset_work, efx_reset_work);
	INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
2843
	INIT_DELAYED_WORK(&efx->selftest_work, efx_selftest_async_work);
2844
	efx->pci_dev = pci_dev;
2845
	efx->msg_enable = debug;
2846
	efx->state = STATE_UNINIT;
2847 2848 2849
	strlcpy(efx->name, pci_name(pci_dev), sizeof(efx->name));

	efx->net_dev = net_dev;
2850
	efx->rx_prefix_size = efx->type->rx_prefix_size;
2851 2852
	efx->rx_ip_align =
		NET_IP_ALIGN ? (efx->rx_prefix_size + NET_IP_ALIGN) % 4 : 0;
2853 2854
	efx->rx_packet_hash_offset =
		efx->type->rx_hash_offset - efx->type->rx_prefix_size;
2855 2856
	efx->rx_packet_ts_offset =
		efx->type->rx_ts_offset - efx->type->rx_prefix_size;
2857 2858 2859
	spin_lock_init(&efx->stats_lock);
	mutex_init(&efx->mac_lock);
	efx->phy_op = &efx_dummy_phy_operations;
2860
	efx->mdio.dev = net_dev;
2861
	INIT_WORK(&efx->mac_work, efx_mac_work);
2862
	init_waitqueue_head(&efx->flush_wq);
2863 2864

	for (i = 0; i < EFX_MAX_CHANNELS; i++) {
2865 2866 2867
		efx->channel[i] = efx_alloc_channel(efx, i, NULL);
		if (!efx->channel[i])
			goto fail;
B
Ben Hutchings 已提交
2868 2869
		efx->msi_context[i].efx = efx;
		efx->msi_context[i].index = i;
2870 2871 2872 2873 2874 2875
	}

	/* Higher numbered interrupt modes are less capable! */
	efx->interrupt_mode = max(efx->type->max_interrupt_mode,
				  interrupt_mode);

2876 2877 2878 2879
	/* Would be good to use the net_dev name, but we're too early */
	snprintf(efx->workqueue_name, sizeof(efx->workqueue_name), "sfc%s",
		 pci_name(pci_dev));
	efx->workqueue = create_singlethread_workqueue(efx->workqueue_name);
2880
	if (!efx->workqueue)
2881
		goto fail;
2882

2883
	return 0;
2884 2885 2886 2887

fail:
	efx_fini_struct(efx);
	return -ENOMEM;
2888 2889 2890 2891
}

static void efx_fini_struct(struct efx_nic *efx)
{
2892 2893 2894 2895 2896
	int i;

	for (i = 0; i < EFX_MAX_CHANNELS; i++)
		kfree(efx->channel[i]);

2897 2898
	kfree(efx->vpd_sn);

2899 2900 2901 2902 2903 2904
	if (efx->workqueue) {
		destroy_workqueue(efx->workqueue);
		efx->workqueue = NULL;
	}
}

2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
void efx_update_sw_stats(struct efx_nic *efx, u64 *stats)
{
	u64 n_rx_nodesc_trunc = 0;
	struct efx_channel *channel;

	efx_for_each_channel(channel, efx)
		n_rx_nodesc_trunc += channel->n_rx_nodesc_trunc;
	stats[GENERIC_STAT_rx_nodesc_trunc] = n_rx_nodesc_trunc;
	stats[GENERIC_STAT_rx_noskb_drops] = atomic_read(&efx->n_rx_noskb_drops);
}

2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
/**************************************************************************
 *
 * PCI interface
 *
 **************************************************************************/

/* Main body of final NIC shutdown code
 * This is called only at module unload (or hotplug removal).
 */
static void efx_pci_remove_main(struct efx_nic *efx)
{
2927 2928 2929 2930 2931 2932
	/* Flush reset_work. It can no longer be scheduled since we
	 * are not READY.
	 */
	BUG_ON(efx->state == STATE_READY);
	cancel_work_sync(&efx->reset_work);

B
Ben Hutchings 已提交
2933
	efx_disable_interrupts(efx);
2934
	efx_nic_fini_interrupt(efx);
2935
	efx_fini_port(efx);
2936
	efx->type->fini(efx);
2937 2938 2939 2940 2941
	efx_fini_napi(efx);
	efx_remove_all(efx);
}

/* Final NIC shutdown
2942 2943
 * This is called only at module unload (or hotplug removal).  A PF can call
 * this on its VFs to ensure they are unbound first.
2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954
 */
static void efx_pci_remove(struct pci_dev *pci_dev)
{
	struct efx_nic *efx;

	efx = pci_get_drvdata(pci_dev);
	if (!efx)
		return;

	/* Mark the NIC as fini, then stop the interface */
	rtnl_lock();
2955
	efx_dissociate(efx);
2956
	dev_close(efx->net_dev);
B
Ben Hutchings 已提交
2957
	efx_disable_interrupts(efx);
2958
	efx->state = STATE_UNINIT;
2959 2960
	rtnl_unlock();

2961 2962 2963
	if (efx->type->sriov_fini)
		efx->type->sriov_fini(efx);

2964 2965
	efx_unregister_netdev(efx);

2966 2967
	efx_mtd_remove(efx);

2968 2969 2970
	efx_pci_remove_main(efx);

	efx_fini_io(efx);
2971
	netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
2972 2973 2974

	efx_fini_struct(efx);
	free_netdev(efx->net_dev);
2975 2976

	pci_disable_pcie_error_reporting(pci_dev);
2977 2978
};

2979 2980 2981 2982 2983 2984
/* NIC VPD information
 * Called during probe to display the part number of the
 * installed NIC.  VPD is potentially very large but this should
 * always appear within the first 512 bytes.
 */
#define SFC_VPD_LEN 512
2985
static void efx_probe_vpd_strings(struct efx_nic *efx)
2986 2987 2988 2989
{
	struct pci_dev *dev = efx->pci_dev;
	char vpd_data[SFC_VPD_LEN];
	ssize_t vpd_size;
2990
	int ro_start, ro_size, i, j;
2991 2992 2993 2994 2995 2996 2997 2998 2999

	/* Get the vpd data from the device */
	vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
	if (vpd_size <= 0) {
		netif_err(efx, drv, efx->net_dev, "Unable to read VPD\n");
		return;
	}

	/* Get the Read only section */
3000 3001
	ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
	if (ro_start < 0) {
3002 3003 3004 3005
		netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
		return;
	}

3006 3007 3008
	ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
	j = ro_size;
	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027
	if (i + j > vpd_size)
		j = vpd_size - i;

	/* Get the Part number */
	i = pci_vpd_find_info_keyword(vpd_data, i, j, "PN");
	if (i < 0) {
		netif_err(efx, drv, efx->net_dev, "Part number not found\n");
		return;
	}

	j = pci_vpd_info_field_size(&vpd_data[i]);
	i += PCI_VPD_INFO_FLD_HDR_SIZE;
	if (i + j > vpd_size) {
		netif_err(efx, drv, efx->net_dev, "Incomplete part number\n");
		return;
	}

	netif_info(efx, drv, efx->net_dev,
		   "Part Number : %.*s\n", j, &vpd_data[i]);
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048

	i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
	j = ro_size;
	i = pci_vpd_find_info_keyword(vpd_data, i, j, "SN");
	if (i < 0) {
		netif_err(efx, drv, efx->net_dev, "Serial number not found\n");
		return;
	}

	j = pci_vpd_info_field_size(&vpd_data[i]);
	i += PCI_VPD_INFO_FLD_HDR_SIZE;
	if (i + j > vpd_size) {
		netif_err(efx, drv, efx->net_dev, "Incomplete serial number\n");
		return;
	}

	efx->vpd_sn = kmalloc(j + 1, GFP_KERNEL);
	if (!efx->vpd_sn)
		return;

	snprintf(efx->vpd_sn, j + 1, "%s", &vpd_data[i]);
3049 3050 3051
}


3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063
/* Main body of NIC initialisation
 * This is called at module load (or hotplug insertion, theoretically).
 */
static int efx_pci_probe_main(struct efx_nic *efx)
{
	int rc;

	/* Do start-of-day initialisation */
	rc = efx_probe_all(efx);
	if (rc)
		goto fail1;

3064
	efx_init_napi(efx);
3065

3066
	rc = efx->type->init(efx);
3067
	if (rc) {
3068 3069
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise NIC\n");
3070
		goto fail3;
3071 3072 3073 3074
	}

	rc = efx_init_port(efx);
	if (rc) {
3075 3076
		netif_err(efx, probe, efx->net_dev,
			  "failed to initialise port\n");
3077
		goto fail4;
3078 3079
	}

3080
	rc = efx_nic_init_interrupt(efx);
3081
	if (rc)
3082
		goto fail5;
3083 3084 3085
	rc = efx_enable_interrupts(efx);
	if (rc)
		goto fail6;
3086 3087 3088

	return 0;

3089 3090
 fail6:
	efx_nic_fini_interrupt(efx);
3091
 fail5:
3092 3093
	efx_fini_port(efx);
 fail4:
3094
	efx->type->fini(efx);
3095 3096 3097 3098 3099 3100 3101 3102 3103 3104
 fail3:
	efx_fini_napi(efx);
	efx_remove_all(efx);
 fail1:
	return rc;
}

/* NIC initialisation
 *
 * This is called at module load (or hotplug insertion,
3105
 * theoretically).  It sets up PCI mappings, resets the NIC,
3106 3107 3108 3109 3110
 * sets up and registers the network devices with the kernel and hooks
 * the interrupt service routine.  It does not prepare the device for
 * transmission; this is left to the first time one of the network
 * interfaces is brought up (i.e. efx_net_open).
 */
B
Bill Pemberton 已提交
3111
static int efx_pci_probe(struct pci_dev *pci_dev,
3112
			 const struct pci_device_id *entry)
3113 3114 3115
{
	struct net_device *net_dev;
	struct efx_nic *efx;
3116
	int rc;
3117 3118

	/* Allocate and initialise a struct net_device and struct efx_nic */
3119 3120
	net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
				     EFX_MAX_RX_QUEUES);
3121 3122
	if (!net_dev)
		return -ENOMEM;
3123 3124 3125
	efx = netdev_priv(net_dev);
	efx->type = (const struct efx_nic_type *) entry->driver_data;
	net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
B
Ben Hutchings 已提交
3126
			      NETIF_F_HIGHDMA | NETIF_F_TSO |
3127
			      NETIF_F_RXCSUM);
3128
	if (efx->type->offload_features & NETIF_F_V6_CSUM)
B
Ben Hutchings 已提交
3129
		net_dev->features |= NETIF_F_TSO6;
3130 3131
	/* Mask for features that also apply to VLAN devices */
	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
3132 3133 3134 3135
				   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
				   NETIF_F_RXCSUM);
	/* All offloads can be toggled */
	net_dev->hw_features = net_dev->features & ~NETIF_F_HIGHDMA;
3136
	pci_set_drvdata(pci_dev, efx);
3137
	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
3138
	rc = efx_init_struct(efx, pci_dev, net_dev);
3139 3140 3141
	if (rc)
		goto fail1;

3142
	netif_info(efx, probe, efx->net_dev,
3143
		   "Solarflare NIC detected\n");
3144

3145 3146
	if (!efx->type->is_vf)
		efx_probe_vpd_strings(efx);
3147

3148 3149 3150 3151 3152
	/* Set up basic I/O (BAR mappings etc) */
	rc = efx_init_io(efx);
	if (rc)
		goto fail2;

3153 3154 3155
	rc = efx_pci_probe_main(efx);
	if (rc)
		goto fail3;
3156 3157 3158

	rc = efx_register_netdev(efx);
	if (rc)
3159
		goto fail4;
3160

3161 3162 3163 3164 3165 3166
	if (efx->type->sriov_init) {
		rc = efx->type->sriov_init(efx);
		if (rc)
			netif_err(efx, probe, efx->net_dev,
				  "SR-IOV can't be enabled rc %d\n", rc);
	}
3167

3168
	netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
3169

3170
	/* Try to create MTDs, but allow this to fail */
3171
	rtnl_lock();
3172
	rc = efx_mtd_probe(efx);
3173
	rtnl_unlock();
3174 3175 3176 3177
	if (rc)
		netif_warn(efx, probe, efx->net_dev,
			   "failed to create MTDs (%d)\n", rc);

3178 3179 3180 3181 3182
	rc = pci_enable_pcie_error_reporting(pci_dev);
	if (rc && rc != -EINVAL)
		netif_warn(efx, probe, efx->net_dev,
			   "pci_enable_pcie_error_reporting failed (%d)\n", rc);

3183 3184 3185
	return 0;

 fail4:
3186
	efx_pci_remove_main(efx);
3187 3188 3189 3190 3191
 fail3:
	efx_fini_io(efx);
 fail2:
	efx_fini_struct(efx);
 fail1:
S
Steve Hodgson 已提交
3192
	WARN_ON(rc > 0);
3193
	netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
3194 3195 3196 3197
	free_netdev(net_dev);
	return rc;
}

3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217
/* efx_pci_sriov_configure returns the actual number of Virtual Functions
 * enabled on success
 */
#ifdef CONFIG_SFC_SRIOV
static int efx_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
{
	int rc;
	struct efx_nic *efx = pci_get_drvdata(dev);

	if (efx->type->sriov_configure) {
		rc = efx->type->sriov_configure(efx, num_vfs);
		if (rc)
			return rc;
		else
			return num_vfs;
	} else
		return -EOPNOTSUPP;
}
#endif

3218 3219 3220 3221
static int efx_pm_freeze(struct device *dev)
{
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3222 3223
	rtnl_lock();

3224 3225
	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_UNINIT;
3226

3227
		efx_device_detach_sync(efx);
3228

3229
		efx_stop_all(efx);
B
Ben Hutchings 已提交
3230
		efx_disable_interrupts(efx);
3231
	}
3232

3233 3234
	rtnl_unlock();

3235 3236 3237 3238 3239
	return 0;
}

static int efx_pm_thaw(struct device *dev)
{
3240
	int rc;
3241 3242
	struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));

3243 3244
	rtnl_lock();

3245
	if (efx->state != STATE_DISABLED) {
3246 3247 3248
		rc = efx_enable_interrupts(efx);
		if (rc)
			goto fail;
3249

3250 3251 3252
		mutex_lock(&efx->mac_lock);
		efx->phy_op->reconfigure(efx);
		mutex_unlock(&efx->mac_lock);
3253

3254
		efx_start_all(efx);
3255

3256
		netif_device_attach(efx->net_dev);
3257

3258
		efx->state = STATE_READY;
3259

3260 3261
		efx->type->resume_wol(efx);
	}
3262

3263 3264
	rtnl_unlock();

3265 3266 3267
	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
	queue_work(reset_workqueue, &efx->reset_work);

3268
	return 0;
3269 3270 3271 3272 3273

fail:
	rtnl_unlock();

	return rc;
3274 3275 3276 3277 3278 3279 3280 3281 3282
}

static int efx_pm_poweroff(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	struct efx_nic *efx = pci_get_drvdata(pci_dev);

	efx->type->fini(efx);

3283
	efx->reset_pending = 0;
3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309

	pci_save_state(pci_dev);
	return pci_set_power_state(pci_dev, PCI_D3hot);
}

/* Used for both resume and restore */
static int efx_pm_resume(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	struct efx_nic *efx = pci_get_drvdata(pci_dev);
	int rc;

	rc = pci_set_power_state(pci_dev, PCI_D0);
	if (rc)
		return rc;
	pci_restore_state(pci_dev);
	rc = pci_enable_device(pci_dev);
	if (rc)
		return rc;
	pci_set_master(efx->pci_dev);
	rc = efx->type->reset(efx, RESET_TYPE_ALL);
	if (rc)
		return rc;
	rc = efx->type->init(efx);
	if (rc)
		return rc;
3310 3311
	rc = efx_pm_thaw(dev);
	return rc;
3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324
}

static int efx_pm_suspend(struct device *dev)
{
	int rc;

	efx_pm_freeze(dev);
	rc = efx_pm_poweroff(dev);
	if (rc)
		efx_pm_resume(dev);
	return rc;
}

3325
static const struct dev_pm_ops efx_pm_ops = {
3326 3327 3328 3329 3330 3331 3332 3333
	.suspend	= efx_pm_suspend,
	.resume		= efx_pm_resume,
	.freeze		= efx_pm_freeze,
	.thaw		= efx_pm_thaw,
	.poweroff	= efx_pm_poweroff,
	.restore	= efx_pm_resume,
};

3334 3335 3336 3337
/* A PCI error affecting this device was detected.
 * At this point MMIO and DMA may be disabled.
 * Stop the software path and request a slot reset.
 */
3338 3339
static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
					      enum pci_channel_state state)
3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355
{
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
	struct efx_nic *efx = pci_get_drvdata(pdev);

	if (state == pci_channel_io_perm_failure)
		return PCI_ERS_RESULT_DISCONNECT;

	rtnl_lock();

	if (efx->state != STATE_DISABLED) {
		efx->state = STATE_RECOVERY;
		efx->reset_pending = 0;

		efx_device_detach_sync(efx);

		efx_stop_all(efx);
B
Ben Hutchings 已提交
3356
		efx_disable_interrupts(efx);
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372

		status = PCI_ERS_RESULT_NEED_RESET;
	} else {
		/* If the interface is disabled we don't want to do anything
		 * with it.
		 */
		status = PCI_ERS_RESULT_RECOVERED;
	}

	rtnl_unlock();

	pci_disable_device(pdev);

	return status;
}

3373
/* Fake a successful reset, which will be performed later in efx_io_resume. */
3374
static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432
{
	struct efx_nic *efx = pci_get_drvdata(pdev);
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
	int rc;

	if (pci_enable_device(pdev)) {
		netif_err(efx, hw, efx->net_dev,
			  "Cannot re-enable PCI device after reset.\n");
		status =  PCI_ERS_RESULT_DISCONNECT;
	}

	rc = pci_cleanup_aer_uncorrect_error_status(pdev);
	if (rc) {
		netif_err(efx, hw, efx->net_dev,
		"pci_cleanup_aer_uncorrect_error_status failed (%d)\n", rc);
		/* Non-fatal error. Continue. */
	}

	return status;
}

/* Perform the actual reset and resume I/O operations. */
static void efx_io_resume(struct pci_dev *pdev)
{
	struct efx_nic *efx = pci_get_drvdata(pdev);
	int rc;

	rtnl_lock();

	if (efx->state == STATE_DISABLED)
		goto out;

	rc = efx_reset(efx, RESET_TYPE_ALL);
	if (rc) {
		netif_err(efx, hw, efx->net_dev,
			  "efx_reset failed after PCI error (%d)\n", rc);
	} else {
		efx->state = STATE_READY;
		netif_dbg(efx, hw, efx->net_dev,
			  "Done resetting and resuming IO after PCI error.\n");
	}

out:
	rtnl_unlock();
}

/* For simplicity and reliability, we always require a slot reset and try to
 * reset the hardware when a pci error affecting the device is detected.
 * We leave both the link_reset and mmio_enabled callback unimplemented:
 * with our request for slot reset the mmio_enabled callback will never be
 * called, and the link_reset callback is not used by AER or EEH mechanisms.
 */
static struct pci_error_handlers efx_err_handlers = {
	.error_detected = efx_io_error_detected,
	.slot_reset	= efx_io_slot_reset,
	.resume		= efx_io_resume,
};

3433
static struct pci_driver efx_pci_driver = {
3434
	.name		= KBUILD_MODNAME,
3435 3436 3437
	.id_table	= efx_pci_table,
	.probe		= efx_pci_probe,
	.remove		= efx_pci_remove,
3438
	.driver.pm	= &efx_pm_ops,
3439
	.err_handler	= &efx_err_handlers,
3440 3441 3442
#ifdef CONFIG_SFC_SRIOV
	.sriov_configure = efx_pci_sriov_configure,
#endif
3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464
};

/**************************************************************************
 *
 * Kernel module interface
 *
 *************************************************************************/

module_param(interrupt_mode, uint, 0444);
MODULE_PARM_DESC(interrupt_mode,
		 "Interrupt mode (0=>MSIX 1=>MSI 2=>legacy)");

static int __init efx_init_module(void)
{
	int rc;

	printk(KERN_INFO "Solarflare NET driver v" EFX_DRIVER_VERSION "\n");

	rc = register_netdevice_notifier(&efx_netdev_notifier);
	if (rc)
		goto err_notifier;

3465
#ifdef CONFIG_SFC_SRIOV
3466 3467 3468
	rc = efx_init_sriov();
	if (rc)
		goto err_sriov;
3469
#endif
3470

3471 3472 3473 3474 3475
	reset_workqueue = create_singlethread_workqueue("sfc_reset");
	if (!reset_workqueue) {
		rc = -ENOMEM;
		goto err_reset;
	}
3476 3477 3478 3479 3480 3481 3482 3483

	rc = pci_register_driver(&efx_pci_driver);
	if (rc < 0)
		goto err_pci;

	return 0;

 err_pci:
3484 3485
	destroy_workqueue(reset_workqueue);
 err_reset:
3486
#ifdef CONFIG_SFC_SRIOV
3487 3488
	efx_fini_sriov();
 err_sriov:
3489
#endif
3490 3491 3492 3493 3494 3495 3496 3497 3498 3499
	unregister_netdevice_notifier(&efx_netdev_notifier);
 err_notifier:
	return rc;
}

static void __exit efx_exit_module(void)
{
	printk(KERN_INFO "Solarflare NET driver unloading\n");

	pci_unregister_driver(&efx_pci_driver);
3500
	destroy_workqueue(reset_workqueue);
3501
#ifdef CONFIG_SFC_SRIOV
3502
	efx_fini_sriov();
3503
#endif
3504 3505 3506 3507 3508 3509 3510
	unregister_netdevice_notifier(&efx_netdev_notifier);

}

module_init(efx_init_module);
module_exit(efx_exit_module);

3511 3512
MODULE_AUTHOR("Solarflare Communications and "
	      "Michael Brown <mbrown@fensystems.co.uk>");
B
Ben Hutchings 已提交
3513
MODULE_DESCRIPTION("Solarflare network driver");
3514 3515
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, efx_pci_table);