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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / sfc / efx.c
blob4481f21a1f43bf39fa12650300b7f1599539c118
1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2005-2013 Solarflare Communications Inc.
6 */
7
8 #include <linux/module.h>
9 #include <linux/pci.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/delay.h>
13 #include <linux/notifier.h>
14 #include <linux/ip.h>
15 #include <linux/tcp.h>
16 #include <linux/in.h>
17 #include <linux/ethtool.h>
18 #include <linux/topology.h>
19 #include <linux/gfp.h>
20 #include <linux/aer.h>
21 #include <linux/interrupt.h>
22 #include "net_driver.h"
23 #include <net/gre.h>
24 #include <net/udp_tunnel.h>
25 #include "efx.h"
26 #include "efx_common.h"
27 #include "efx_channels.h"
28 #include "rx_common.h"
29 #include "tx_common.h"
30 #include "nic.h"
31 #include "io.h"
32 #include "selftest.h"
33 #include "sriov.h"
34
35 #include "mcdi.h"
36 #include "mcdi_pcol.h"
37 #include "workarounds.h"
38
39 /**************************************************************************
40 *
41 * Type name strings
42 *
43 **************************************************************************
44 */
45
46 /* UDP tunnel type names */
47 static const char *const efx_udp_tunnel_type_names[] = {
48 [TUNNEL_ENCAP_UDP_PORT_ENTRY_VXLAN] = "vxlan",
49 [TUNNEL_ENCAP_UDP_PORT_ENTRY_GENEVE] = "geneve",
50 };
51
52 void efx_get_udp_tunnel_type_name(u16 type, char *buf, size_t buflen)
53 {
54 if (type < ARRAY_SIZE(efx_udp_tunnel_type_names) &&
55 efx_udp_tunnel_type_names[type] != NULL)
56 snprintf(buf, buflen, "%s", efx_udp_tunnel_type_names[type]);
57 else
58 snprintf(buf, buflen, "type %d", type);
59 }
60
61 /**************************************************************************
62 *
63 * Configurable values
64 *
65 *************************************************************************/
66
67 /*
68 * Use separate channels for TX and RX events
69 *
70 * Set this to 1 to use separate channels for TX and RX. It allows us
71 * to control interrupt affinity separately for TX and RX.
72 *
73 * This is only used in MSI-X interrupt mode
74 */
75 bool efx_separate_tx_channels;
76 module_param(efx_separate_tx_channels, bool, 0444);
77 MODULE_PARM_DESC(efx_separate_tx_channels,
78 "Use separate channels for TX and RX");
79
80 /* Initial interrupt moderation settings. They can be modified after
81 * module load with ethtool.
82 *
83 * The default for RX should strike a balance between increasing the
84 * round-trip latency and reducing overhead.
85 */
86 static unsigned int rx_irq_mod_usec = 60;
87
88 /* Initial interrupt moderation settings. They can be modified after
89 * module load with ethtool.
90 *
91 * This default is chosen to ensure that a 10G link does not go idle
92 * while a TX queue is stopped after it has become full. A queue is
93 * restarted when it drops below half full. The time this takes (assuming
94 * worst case 3 descriptors per packet and 1024 descriptors) is
95 * 512 / 3 * 1.2 = 205 usec.
96 */
97 static unsigned int tx_irq_mod_usec = 150;
98
99 static bool phy_flash_cfg;
100 module_param(phy_flash_cfg, bool, 0644);
101 MODULE_PARM_DESC(phy_flash_cfg, "Set PHYs into reflash mode initially");
102
103 static unsigned debug = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
104 NETIF_MSG_LINK | NETIF_MSG_IFDOWN |
105 NETIF_MSG_IFUP | NETIF_MSG_RX_ERR |
106 NETIF_MSG_TX_ERR | NETIF_MSG_HW);
107 module_param(debug, uint, 0);
108 MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");
109
110 /**************************************************************************
111 *
112 * Utility functions and prototypes
113 *
114 *************************************************************************/
115
116 static const struct efx_channel_type efx_default_channel_type;
117 static void efx_remove_port(struct efx_nic *efx);
118 static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog);
119 static int efx_xdp(struct net_device *dev, struct netdev_bpf *xdp);
120 static int efx_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **xdpfs,
121 u32 flags);
122
123 #define EFX_ASSERT_RESET_SERIALISED(efx) \
124 do { \
125 if ((efx->state == STATE_READY) || \
126 (efx->state == STATE_RECOVERY) || \
127 (efx->state == STATE_DISABLED)) \
128 ASSERT_RTNL(); \
129 } while (0)
130
131 /**************************************************************************
132 *
133 * Port handling
134 *
135 **************************************************************************/
136
137 /* Equivalent to efx_link_set_advertising with all-zeroes, except does not
138 * force the Autoneg bit on.
139 */
140 void efx_link_clear_advertising(struct efx_nic *efx)
141 {
142 bitmap_zero(efx->link_advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
143 efx->wanted_fc &= ~(EFX_FC_TX | EFX_FC_RX);
144 }
145
146 void efx_link_set_wanted_fc(struct efx_nic *efx, u8 wanted_fc)
147 {
148 efx->wanted_fc = wanted_fc;
149 if (efx->link_advertising[0]) {
150 if (wanted_fc & EFX_FC_RX)
151 efx->link_advertising[0] |= (ADVERTISED_Pause |
152 ADVERTISED_Asym_Pause);
153 else
154 efx->link_advertising[0] &= ~(ADVERTISED_Pause |
155 ADVERTISED_Asym_Pause);
156 if (wanted_fc & EFX_FC_TX)
157 efx->link_advertising[0] ^= ADVERTISED_Asym_Pause;
158 }
159 }
160
161 static void efx_fini_port(struct efx_nic *efx);
162
163 static int efx_probe_port(struct efx_nic *efx)
164 {
165 int rc;
166
167 netif_dbg(efx, probe, efx->net_dev, "create port\n");
168
169 if (phy_flash_cfg)
170 efx->phy_mode = PHY_MODE_SPECIAL;
171
172 /* Connect up MAC/PHY operations table */
173 rc = efx->type->probe_port(efx);
174 if (rc)
175 return rc;
176
177 /* Initialise MAC address to permanent address */
178 ether_addr_copy(efx->net_dev->dev_addr, efx->net_dev->perm_addr);
179
180 return 0;
181 }
182
183 static int efx_init_port(struct efx_nic *efx)
184 {
185 int rc;
186
187 netif_dbg(efx, drv, efx->net_dev, "init port\n");
188
189 mutex_lock(&efx->mac_lock);
190
191 rc = efx->phy_op->init(efx);
192 if (rc)
193 goto fail1;
194
195 efx->port_initialized = true;
196
197 /* Reconfigure the MAC before creating dma queues (required for
198 * Falcon/A1 where RX_INGR_EN/TX_DRAIN_EN isn't supported) */
199 efx_mac_reconfigure(efx);
200
201 /* Ensure the PHY advertises the correct flow control settings */
202 rc = efx->phy_op->reconfigure(efx);
203 if (rc && rc != -EPERM)
204 goto fail2;
205
206 mutex_unlock(&efx->mac_lock);
207 return 0;
208
209 fail2:
210 efx->phy_op->fini(efx);
211 fail1:
212 mutex_unlock(&efx->mac_lock);
213 return rc;
214 }
215
216 static void efx_fini_port(struct efx_nic *efx)
217 {
218 netif_dbg(efx, drv, efx->net_dev, "shut down port\n");
219
220 if (!efx->port_initialized)
221 return;
222
223 efx->phy_op->fini(efx);
224 efx->port_initialized = false;
225
226 efx->link_state.up = false;
227 efx_link_status_changed(efx);
228 }
229
230 static void efx_remove_port(struct efx_nic *efx)
231 {
232 netif_dbg(efx, drv, efx->net_dev, "destroying port\n");
233
234 efx->type->remove_port(efx);
235 }
236
237 /**************************************************************************
238 *
239 * NIC handling
240 *
241 **************************************************************************/
242
243 static LIST_HEAD(efx_primary_list);
244 static LIST_HEAD(efx_unassociated_list);
245
246 static bool efx_same_controller(struct efx_nic *left, struct efx_nic *right)
247 {
248 return left->type == right->type &&
249 left->vpd_sn && right->vpd_sn &&
250 !strcmp(left->vpd_sn, right->vpd_sn);
251 }
252
253 static void efx_associate(struct efx_nic *efx)
254 {
255 struct efx_nic *other, *next;
256
257 if (efx->primary == efx) {
258 /* Adding primary function; look for secondaries */
259
260 netif_dbg(efx, probe, efx->net_dev, "adding to primary list\n");
261 list_add_tail(&efx->node, &efx_primary_list);
262
263 list_for_each_entry_safe(other, next, &efx_unassociated_list,
264 node) {
265 if (efx_same_controller(efx, other)) {
266 list_del(&other->node);
267 netif_dbg(other, probe, other->net_dev,
268 "moving to secondary list of %s %s\n",
269 pci_name(efx->pci_dev),
270 efx->net_dev->name);
271 list_add_tail(&other->node,
272 &efx->secondary_list);
273 other->primary = efx;
274 }
275 }
276 } else {
277 /* Adding secondary function; look for primary */
278
279 list_for_each_entry(other, &efx_primary_list, node) {
280 if (efx_same_controller(efx, other)) {
281 netif_dbg(efx, probe, efx->net_dev,
282 "adding to secondary list of %s %s\n",
283 pci_name(other->pci_dev),
284 other->net_dev->name);
285 list_add_tail(&efx->node,
286 &other->secondary_list);
287 efx->primary = other;
288 return;
289 }
290 }
291
292 netif_dbg(efx, probe, efx->net_dev,
293 "adding to unassociated list\n");
294 list_add_tail(&efx->node, &efx_unassociated_list);
295 }
296 }
297
298 static void efx_dissociate(struct efx_nic *efx)
299 {
300 struct efx_nic *other, *next;
301
302 list_del(&efx->node);
303 efx->primary = NULL;
304
305 list_for_each_entry_safe(other, next, &efx->secondary_list, node) {
306 list_del(&other->node);
307 netif_dbg(other, probe, other->net_dev,
308 "moving to unassociated list\n");
309 list_add_tail(&other->node, &efx_unassociated_list);
310 other->primary = NULL;
311 }
312 }
313
314 static int efx_probe_nic(struct efx_nic *efx)
315 {
316 int rc;
317
318 netif_dbg(efx, probe, efx->net_dev, "creating NIC\n");
319
320 /* Carry out hardware-type specific initialisation */
321 rc = efx->type->probe(efx);
322 if (rc)
323 return rc;
324
325 do {
326 if (!efx->max_channels || !efx->max_tx_channels) {
327 netif_err(efx, drv, efx->net_dev,
328 "Insufficient resources to allocate"
329 " any channels\n");
330 rc = -ENOSPC;
331 goto fail1;
332 }
333
334 /* Determine the number of channels and queues by trying
335 * to hook in MSI-X interrupts.
336 */
337 rc = efx_probe_interrupts(efx);
338 if (rc)
339 goto fail1;
340
341 rc = efx_set_channels(efx);
342 if (rc)
343 goto fail1;
344
345 /* dimension_resources can fail with EAGAIN */
346 rc = efx->type->dimension_resources(efx);
347 if (rc != 0 && rc != -EAGAIN)
348 goto fail2;
349
350 if (rc == -EAGAIN)
351 /* try again with new max_channels */
352 efx_remove_interrupts(efx);
353
354 } while (rc == -EAGAIN);
355
356 if (efx->n_channels > 1)
357 netdev_rss_key_fill(efx->rss_context.rx_hash_key,
358 sizeof(efx->rss_context.rx_hash_key));
359 efx_set_default_rx_indir_table(efx, &efx->rss_context);
360
361 netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels);
362 netif_set_real_num_rx_queues(efx->net_dev, efx->n_rx_channels);
363
364 /* Initialise the interrupt moderation settings */
365 efx->irq_mod_step_us = DIV_ROUND_UP(efx->timer_quantum_ns, 1000);
366 efx_init_irq_moderation(efx, tx_irq_mod_usec, rx_irq_mod_usec, true,
367 true);
368
369 return 0;
370
371 fail2:
372 efx_remove_interrupts(efx);
373 fail1:
374 efx->type->remove(efx);
375 return rc;
376 }
377
378 static void efx_remove_nic(struct efx_nic *efx)
379 {
380 netif_dbg(efx, drv, efx->net_dev, "destroying NIC\n");
381
382 efx_remove_interrupts(efx);
383 efx->type->remove(efx);
384 }
385
386 /**************************************************************************
387 *
388 * NIC startup/shutdown
389 *
390 *************************************************************************/
391
392 static int efx_probe_all(struct efx_nic *efx)
393 {
394 int rc;
395
396 rc = efx_probe_nic(efx);
397 if (rc) {
398 netif_err(efx, probe, efx->net_dev, "failed to create NIC\n");
399 goto fail1;
400 }
401
402 rc = efx_probe_port(efx);
403 if (rc) {
404 netif_err(efx, probe, efx->net_dev, "failed to create port\n");
405 goto fail2;
406 }
407
408 BUILD_BUG_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_RXQ_MIN_ENT);
409 if (WARN_ON(EFX_DEFAULT_DMAQ_SIZE < EFX_TXQ_MIN_ENT(efx))) {
410 rc = -EINVAL;
411 goto fail3;
412 }
413 efx->rxq_entries = efx->txq_entries = EFX_DEFAULT_DMAQ_SIZE;
414
415 #ifdef CONFIG_SFC_SRIOV
416 rc = efx->type->vswitching_probe(efx);
417 if (rc) /* not fatal; the PF will still work fine */
418 netif_warn(efx, probe, efx->net_dev,
419 "failed to setup vswitching rc=%d;"
420 " VFs may not function\n", rc);
421 #endif
422
423 rc = efx_probe_filters(efx);
424 if (rc) {
425 netif_err(efx, probe, efx->net_dev,
426 "failed to create filter tables\n");
427 goto fail4;
428 }
429
430 rc = efx_probe_channels(efx);
431 if (rc)
432 goto fail5;
433
434 return 0;
435
436 fail5:
437 efx_remove_filters(efx);
438 fail4:
439 #ifdef CONFIG_SFC_SRIOV
440 efx->type->vswitching_remove(efx);
441 #endif
442 fail3:
443 efx_remove_port(efx);
444 fail2:
445 efx_remove_nic(efx);
446 fail1:
447 return rc;
448 }
449
450 static void efx_remove_all(struct efx_nic *efx)
451 {
452 rtnl_lock();
453 efx_xdp_setup_prog(efx, NULL);
454 rtnl_unlock();
455
456 efx_remove_channels(efx);
457 efx_remove_filters(efx);
458 #ifdef CONFIG_SFC_SRIOV
459 efx->type->vswitching_remove(efx);
460 #endif
461 efx_remove_port(efx);
462 efx_remove_nic(efx);
463 }
464
465 /**************************************************************************
466 *
467 * Interrupt moderation
468 *
469 **************************************************************************/
470 unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs)
471 {
472 if (usecs == 0)
473 return 0;
474 if (usecs * 1000 < efx->timer_quantum_ns)
475 return 1; /* never round down to 0 */
476 return usecs * 1000 / efx->timer_quantum_ns;
477 }
478
479 unsigned int efx_ticks_to_usecs(struct efx_nic *efx, unsigned int ticks)
480 {
481 /* We must round up when converting ticks to microseconds
482 * because we round down when converting the other way.
483 */
484 return DIV_ROUND_UP(ticks * efx->timer_quantum_ns, 1000);
485 }
486
487 /* Set interrupt moderation parameters */
488 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
489 unsigned int rx_usecs, bool rx_adaptive,
490 bool rx_may_override_tx)
491 {
492 struct efx_channel *channel;
493 unsigned int timer_max_us;
494
495 EFX_ASSERT_RESET_SERIALISED(efx);
496
497 timer_max_us = efx->timer_max_ns / 1000;
498
499 if (tx_usecs > timer_max_us || rx_usecs > timer_max_us)
500 return -EINVAL;
501
502 if (tx_usecs != rx_usecs && efx->tx_channel_offset == 0 &&
503 !rx_may_override_tx) {
504 netif_err(efx, drv, efx->net_dev, "Channels are shared. "
505 "RX and TX IRQ moderation must be equal\n");
506 return -EINVAL;
507 }
508
509 efx->irq_rx_adaptive = rx_adaptive;
510 efx->irq_rx_moderation_us = rx_usecs;
511 efx_for_each_channel(channel, efx) {
512 if (efx_channel_has_rx_queue(channel))
513 channel->irq_moderation_us = rx_usecs;
514 else if (efx_channel_has_tx_queues(channel))
515 channel->irq_moderation_us = tx_usecs;
516 else if (efx_channel_is_xdp_tx(channel))
517 channel->irq_moderation_us = tx_usecs;
518 }
519
520 return 0;
521 }
522
523 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
524 unsigned int *rx_usecs, bool *rx_adaptive)
525 {
526 *rx_adaptive = efx->irq_rx_adaptive;
527 *rx_usecs = efx->irq_rx_moderation_us;
528
529 /* If channels are shared between RX and TX, so is IRQ
530 * moderation. Otherwise, IRQ moderation is the same for all
531 * TX channels and is not adaptive.
532 */
533 if (efx->tx_channel_offset == 0) {
534 *tx_usecs = *rx_usecs;
535 } else {
536 struct efx_channel *tx_channel;
537
538 tx_channel = efx->channel[efx->tx_channel_offset];
539 *tx_usecs = tx_channel->irq_moderation_us;
540 }
541 }
542
543 /**************************************************************************
544 *
545 * ioctls
546 *
547 *************************************************************************/
548
549 /* Net device ioctl
550 * Context: process, rtnl_lock() held.
551 */
552 static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
553 {
554 struct efx_nic *efx = netdev_priv(net_dev);
555 struct mii_ioctl_data *data = if_mii(ifr);
556
557 if (cmd == SIOCSHWTSTAMP)
558 return efx_ptp_set_ts_config(efx, ifr);
559 if (cmd == SIOCGHWTSTAMP)
560 return efx_ptp_get_ts_config(efx, ifr);
561
562 /* Convert phy_id from older PRTAD/DEVAD format */
563 if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) &&
564 (data->phy_id & 0xfc00) == 0x0400)
565 data->phy_id ^= MDIO_PHY_ID_C45 | 0x0400;
566
567 return mdio_mii_ioctl(&efx->mdio, data, cmd);
568 }
569
570 /**************************************************************************
571 *
572 * Kernel net device interface
573 *
574 *************************************************************************/
575
576 /* Context: process, rtnl_lock() held. */
577 int efx_net_open(struct net_device *net_dev)
578 {
579 struct efx_nic *efx = netdev_priv(net_dev);
580 int rc;
581
582 netif_dbg(efx, ifup, efx->net_dev, "opening device on CPU %d\n",
583 raw_smp_processor_id());
584
585 rc = efx_check_disabled(efx);
586 if (rc)
587 return rc;
588 if (efx->phy_mode & PHY_MODE_SPECIAL)
589 return -EBUSY;
590 if (efx_mcdi_poll_reboot(efx) && efx_reset(efx, RESET_TYPE_ALL))
591 return -EIO;
592
593 /* Notify the kernel of the link state polled during driver load,
594 * before the monitor starts running */
595 efx_link_status_changed(efx);
596
597 efx_start_all(efx);
598 if (efx->state == STATE_DISABLED || efx->reset_pending)
599 netif_device_detach(efx->net_dev);
600 efx_selftest_async_start(efx);
601 return 0;
602 }
603
604 /* Context: process, rtnl_lock() held.
605 * Note that the kernel will ignore our return code; this method
606 * should really be a void.
607 */
608 int efx_net_stop(struct net_device *net_dev)
609 {
610 struct efx_nic *efx = netdev_priv(net_dev);
611
612 netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
613 raw_smp_processor_id());
614
615 /* Stop the device and flush all the channels */
616 efx_stop_all(efx);
617
618 return 0;
619 }
620
621 /* Context: netif_tx_lock held, BHs disabled. */
622 static void efx_watchdog(struct net_device *net_dev, unsigned int txqueue)
623 {
624 struct efx_nic *efx = netdev_priv(net_dev);
625
626 netif_err(efx, tx_err, efx->net_dev,
627 "TX stuck with port_enabled=%d: resetting channels\n",
628 efx->port_enabled);
629
630 efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
631 }
632
633 static int efx_set_mac_address(struct net_device *net_dev, void *data)
634 {
635 struct efx_nic *efx = netdev_priv(net_dev);
636 struct sockaddr *addr = data;
637 u8 *new_addr = addr->sa_data;
638 u8 old_addr[6];
639 int rc;
640
641 if (!is_valid_ether_addr(new_addr)) {
642 netif_err(efx, drv, efx->net_dev,
643 "invalid ethernet MAC address requested: %pM\n",
644 new_addr);
645 return -EADDRNOTAVAIL;
646 }
647
648 /* save old address */
649 ether_addr_copy(old_addr, net_dev->dev_addr);
650 ether_addr_copy(net_dev->dev_addr, new_addr);
651 if (efx->type->set_mac_address) {
652 rc = efx->type->set_mac_address(efx);
653 if (rc) {
654 ether_addr_copy(net_dev->dev_addr, old_addr);
655 return rc;
656 }
657 }
658
659 /* Reconfigure the MAC */
660 mutex_lock(&efx->mac_lock);
661 efx_mac_reconfigure(efx);
662 mutex_unlock(&efx->mac_lock);
663
664 return 0;
665 }
666
667 /* Context: netif_addr_lock held, BHs disabled. */
668 static void efx_set_rx_mode(struct net_device *net_dev)
669 {
670 struct efx_nic *efx = netdev_priv(net_dev);
671
672 if (efx->port_enabled)
673 queue_work(efx->workqueue, &efx->mac_work);
674 /* Otherwise efx_start_port() will do this */
675 }
676
677 static int efx_set_features(struct net_device *net_dev, netdev_features_t data)
678 {
679 struct efx_nic *efx = netdev_priv(net_dev);
680 int rc;
681
682 /* If disabling RX n-tuple filtering, clear existing filters */
683 if (net_dev->features & ~data & NETIF_F_NTUPLE) {
684 rc = efx->type->filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
685 if (rc)
686 return rc;
687 }
688
689 /* If Rx VLAN filter is changed, update filters via mac_reconfigure.
690 * If rx-fcs is changed, mac_reconfigure updates that too.
691 */
692 if ((net_dev->features ^ data) & (NETIF_F_HW_VLAN_CTAG_FILTER |
693 NETIF_F_RXFCS)) {
694 /* efx_set_rx_mode() will schedule MAC work to update filters
695 * when a new features are finally set in net_dev.
696 */
697 efx_set_rx_mode(net_dev);
698 }
699
700 return 0;
701 }
702
703 static int efx_get_phys_port_id(struct net_device *net_dev,
704 struct netdev_phys_item_id *ppid)
705 {
706 struct efx_nic *efx = netdev_priv(net_dev);
707
708 if (efx->type->get_phys_port_id)
709 return efx->type->get_phys_port_id(efx, ppid);
710 else
711 return -EOPNOTSUPP;
712 }
713
714 static int efx_get_phys_port_name(struct net_device *net_dev,
715 char *name, size_t len)
716 {
717 struct efx_nic *efx = netdev_priv(net_dev);
718
719 if (snprintf(name, len, "p%u", efx->port_num) >= len)
720 return -EINVAL;
721 return 0;
722 }
723
724 static int efx_vlan_rx_add_vid(struct net_device *net_dev, __be16 proto, u16 vid)
725 {
726 struct efx_nic *efx = netdev_priv(net_dev);
727
728 if (efx->type->vlan_rx_add_vid)
729 return efx->type->vlan_rx_add_vid(efx, proto, vid);
730 else
731 return -EOPNOTSUPP;
732 }
733
734 static int efx_vlan_rx_kill_vid(struct net_device *net_dev, __be16 proto, u16 vid)
735 {
736 struct efx_nic *efx = netdev_priv(net_dev);
737
738 if (efx->type->vlan_rx_kill_vid)
739 return efx->type->vlan_rx_kill_vid(efx, proto, vid);
740 else
741 return -EOPNOTSUPP;
742 }
743
744 static int efx_udp_tunnel_type_map(enum udp_parsable_tunnel_type in)
745 {
746 switch (in) {
747 case UDP_TUNNEL_TYPE_VXLAN:
748 return TUNNEL_ENCAP_UDP_PORT_ENTRY_VXLAN;
749 case UDP_TUNNEL_TYPE_GENEVE:
750 return TUNNEL_ENCAP_UDP_PORT_ENTRY_GENEVE;
751 default:
752 return -1;
753 }
754 }
755
756 static void efx_udp_tunnel_add(struct net_device *dev, struct udp_tunnel_info *ti)
757 {
758 struct efx_nic *efx = netdev_priv(dev);
759 struct efx_udp_tunnel tnl;
760 int efx_tunnel_type;
761
762 efx_tunnel_type = efx_udp_tunnel_type_map(ti->type);
763 if (efx_tunnel_type < 0)
764 return;
765
766 tnl.type = (u16)efx_tunnel_type;
767 tnl.port = ti->port;
768
769 if (efx->type->udp_tnl_add_port)
770 (void)efx->type->udp_tnl_add_port(efx, tnl);
771 }
772
773 static void efx_udp_tunnel_del(struct net_device *dev, struct udp_tunnel_info *ti)
774 {
775 struct efx_nic *efx = netdev_priv(dev);
776 struct efx_udp_tunnel tnl;
777 int efx_tunnel_type;
778
779 efx_tunnel_type = efx_udp_tunnel_type_map(ti->type);
780 if (efx_tunnel_type < 0)
781 return;
782
783 tnl.type = (u16)efx_tunnel_type;
784 tnl.port = ti->port;
785
786 if (efx->type->udp_tnl_del_port)
787 (void)efx->type->udp_tnl_del_port(efx, tnl);
788 }
789
790 static const struct net_device_ops efx_netdev_ops = {
791 .ndo_open = efx_net_open,
792 .ndo_stop = efx_net_stop,
793 .ndo_get_stats64 = efx_net_stats,
794 .ndo_tx_timeout = efx_watchdog,
795 .ndo_start_xmit = efx_hard_start_xmit,
796 .ndo_validate_addr = eth_validate_addr,
797 .ndo_do_ioctl = efx_ioctl,
798 .ndo_change_mtu = efx_change_mtu,
799 .ndo_set_mac_address = efx_set_mac_address,
800 .ndo_set_rx_mode = efx_set_rx_mode,
801 .ndo_set_features = efx_set_features,
802 .ndo_vlan_rx_add_vid = efx_vlan_rx_add_vid,
803 .ndo_vlan_rx_kill_vid = efx_vlan_rx_kill_vid,
804 #ifdef CONFIG_SFC_SRIOV
805 .ndo_set_vf_mac = efx_sriov_set_vf_mac,
806 .ndo_set_vf_vlan = efx_sriov_set_vf_vlan,
807 .ndo_set_vf_spoofchk = efx_sriov_set_vf_spoofchk,
808 .ndo_get_vf_config = efx_sriov_get_vf_config,
809 .ndo_set_vf_link_state = efx_sriov_set_vf_link_state,
810 #endif
811 .ndo_get_phys_port_id = efx_get_phys_port_id,
812 .ndo_get_phys_port_name = efx_get_phys_port_name,
813 .ndo_setup_tc = efx_setup_tc,
814 #ifdef CONFIG_RFS_ACCEL
815 .ndo_rx_flow_steer = efx_filter_rfs,
816 #endif
817 .ndo_udp_tunnel_add = efx_udp_tunnel_add,
818 .ndo_udp_tunnel_del = efx_udp_tunnel_del,
819 .ndo_xdp_xmit = efx_xdp_xmit,
820 .ndo_bpf = efx_xdp
821 };
822
823 static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog)
824 {
825 struct bpf_prog *old_prog;
826
827 if (efx->xdp_rxq_info_failed) {
828 netif_err(efx, drv, efx->net_dev,
829 "Unable to bind XDP program due to previous failure of rxq_info\n");
830 return -EINVAL;
831 }
832
833 if (prog && efx->net_dev->mtu > efx_xdp_max_mtu(efx)) {
834 netif_err(efx, drv, efx->net_dev,
835 "Unable to configure XDP with MTU of %d (max: %d)\n",
836 efx->net_dev->mtu, efx_xdp_max_mtu(efx));
837 return -EINVAL;
838 }
839
840 old_prog = rtnl_dereference(efx->xdp_prog);
841 rcu_assign_pointer(efx->xdp_prog, prog);
842 /* Release the reference that was originally passed by the caller. */
843 if (old_prog)
844 bpf_prog_put(old_prog);
845
846 return 0;
847 }
848
849 /* Context: process, rtnl_lock() held. */
850 static int efx_xdp(struct net_device *dev, struct netdev_bpf *xdp)
851 {
852 struct efx_nic *efx = netdev_priv(dev);
853 struct bpf_prog *xdp_prog;
854
855 switch (xdp->command) {
856 case XDP_SETUP_PROG:
857 return efx_xdp_setup_prog(efx, xdp->prog);
858 case XDP_QUERY_PROG:
859 xdp_prog = rtnl_dereference(efx->xdp_prog);
860 xdp->prog_id = xdp_prog ? xdp_prog->aux->id : 0;
861 return 0;
862 default:
863 return -EINVAL;
864 }
865 }
866
867 static int efx_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **xdpfs,
868 u32 flags)
869 {
870 struct efx_nic *efx = netdev_priv(dev);
871
872 if (!netif_running(dev))
873 return -EINVAL;
874
875 return efx_xdp_tx_buffers(efx, n, xdpfs, flags & XDP_XMIT_FLUSH);
876 }
877
878 static void efx_update_name(struct efx_nic *efx)
879 {
880 strcpy(efx->name, efx->net_dev->name);
881 efx_mtd_rename(efx);
882 efx_set_channel_names(efx);
883 }
884
885 static int efx_netdev_event(struct notifier_block *this,
886 unsigned long event, void *ptr)
887 {
888 struct net_device *net_dev = netdev_notifier_info_to_dev(ptr);
889
890 if ((net_dev->netdev_ops == &efx_netdev_ops) &&
891 event == NETDEV_CHANGENAME)
892 efx_update_name(netdev_priv(net_dev));
893
894 return NOTIFY_DONE;
895 }
896
897 static struct notifier_block efx_netdev_notifier = {
898 .notifier_call = efx_netdev_event,
899 };
900
901 static ssize_t
902 show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
903 {
904 struct efx_nic *efx = dev_get_drvdata(dev);
905 return sprintf(buf, "%d\n", efx->phy_type);
906 }
907 static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
908
909 static int efx_register_netdev(struct efx_nic *efx)
910 {
911 struct net_device *net_dev = efx->net_dev;
912 struct efx_channel *channel;
913 int rc;
914
915 net_dev->watchdog_timeo = 5 * HZ;
916 net_dev->irq = efx->pci_dev->irq;
917 net_dev->netdev_ops = &efx_netdev_ops;
918 if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
919 net_dev->priv_flags |= IFF_UNICAST_FLT;
920 net_dev->ethtool_ops = &efx_ethtool_ops;
921 net_dev->gso_max_segs = EFX_TSO_MAX_SEGS;
922 net_dev->min_mtu = EFX_MIN_MTU;
923 net_dev->max_mtu = EFX_MAX_MTU;
924
925 rtnl_lock();
926
927 /* Enable resets to be scheduled and check whether any were
928 * already requested. If so, the NIC is probably hosed so we
929 * abort.
930 */
931 efx->state = STATE_READY;
932 smp_mb(); /* ensure we change state before checking reset_pending */
933 if (efx->reset_pending) {
934 netif_err(efx, probe, efx->net_dev,
935 "aborting probe due to scheduled reset\n");
936 rc = -EIO;
937 goto fail_locked;
938 }
939
940 rc = dev_alloc_name(net_dev, net_dev->name);
941 if (rc < 0)
942 goto fail_locked;
943 efx_update_name(efx);
944
945 /* Always start with carrier off; PHY events will detect the link */
946 netif_carrier_off(net_dev);
947
948 rc = register_netdevice(net_dev);
949 if (rc)
950 goto fail_locked;
951
952 efx_for_each_channel(channel, efx) {
953 struct efx_tx_queue *tx_queue;
954 efx_for_each_channel_tx_queue(tx_queue, channel)
955 efx_init_tx_queue_core_txq(tx_queue);
956 }
957
958 efx_associate(efx);
959
960 rtnl_unlock();
961
962 rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_type);
963 if (rc) {
964 netif_err(efx, drv, efx->net_dev,
965 "failed to init net dev attributes\n");
966 goto fail_registered;
967 }
968
969 efx_init_mcdi_logging(efx);
970
971 return 0;
972
973 fail_registered:
974 rtnl_lock();
975 efx_dissociate(efx);
976 unregister_netdevice(net_dev);
977 fail_locked:
978 efx->state = STATE_UNINIT;
979 rtnl_unlock();
980 netif_err(efx, drv, efx->net_dev, "could not register net dev\n");
981 return rc;
982 }
983
984 static void efx_unregister_netdev(struct efx_nic *efx)
985 {
986 if (!efx->net_dev)
987 return;
988
989 BUG_ON(netdev_priv(efx->net_dev) != efx);
990
991 if (efx_dev_registered(efx)) {
992 strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
993 efx_fini_mcdi_logging(efx);
994 device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
995 unregister_netdev(efx->net_dev);
996 }
997 }
998
999 /**************************************************************************
1000 *
1001 * List of NICs we support
1002 *
1003 **************************************************************************/
1004
1005 /* PCI device ID table */
1006 static const struct pci_device_id efx_pci_table[] = {
1007 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0803), /* SFC9020 */
1008 .driver_data = (unsigned long) &siena_a0_nic_type},
1009 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0813), /* SFL9021 */
1010 .driver_data = (unsigned long) &siena_a0_nic_type},
1011 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0903), /* SFC9120 PF */
1012 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
1013 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1903), /* SFC9120 VF */
1014 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
1015 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0923), /* SFC9140 PF */
1016 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
1017 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1923), /* SFC9140 VF */
1018 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
1019 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0a03), /* SFC9220 PF */
1020 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
1021 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1a03), /* SFC9220 VF */
1022 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
1023 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x0b03), /* SFC9250 PF */
1024 .driver_data = (unsigned long) &efx_hunt_a0_nic_type},
1025 {PCI_DEVICE(PCI_VENDOR_ID_SOLARFLARE, 0x1b03), /* SFC9250 VF */
1026 .driver_data = (unsigned long) &efx_hunt_a0_vf_nic_type},
1027 {0} /* end of list */
1028 };
1029
1030 /**************************************************************************
1031 *
1032 * Data housekeeping
1033 *
1034 **************************************************************************/
1035
1036 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats)
1037 {
1038 u64 n_rx_nodesc_trunc = 0;
1039 struct efx_channel *channel;
1040
1041 efx_for_each_channel(channel, efx)
1042 n_rx_nodesc_trunc += channel->n_rx_nodesc_trunc;
1043 stats[GENERIC_STAT_rx_nodesc_trunc] = n_rx_nodesc_trunc;
1044 stats[GENERIC_STAT_rx_noskb_drops] = atomic_read(&efx->n_rx_noskb_drops);
1045 }
1046
1047 /**************************************************************************
1048 *
1049 * PCI interface
1050 *
1051 **************************************************************************/
1052
1053 /* Main body of final NIC shutdown code
1054 * This is called only at module unload (or hotplug removal).
1055 */
1056 static void efx_pci_remove_main(struct efx_nic *efx)
1057 {
1058 /* Flush reset_work. It can no longer be scheduled since we
1059 * are not READY.
1060 */
1061 BUG_ON(efx->state == STATE_READY);
1062 efx_flush_reset_workqueue(efx);
1063
1064 efx_disable_interrupts(efx);
1065 efx_clear_interrupt_affinity(efx);
1066 efx_nic_fini_interrupt(efx);
1067 efx_fini_port(efx);
1068 efx->type->fini(efx);
1069 efx_fini_napi(efx);
1070 efx_remove_all(efx);
1071 }
1072
1073 /* Final NIC shutdown
1074 * This is called only at module unload (or hotplug removal). A PF can call
1075 * this on its VFs to ensure they are unbound first.
1076 */
1077 static void efx_pci_remove(struct pci_dev *pci_dev)
1078 {
1079 struct efx_nic *efx;
1080
1081 efx = pci_get_drvdata(pci_dev);
1082 if (!efx)
1083 return;
1084
1085 /* Mark the NIC as fini, then stop the interface */
1086 rtnl_lock();
1087 efx_dissociate(efx);
1088 dev_close(efx->net_dev);
1089 efx_disable_interrupts(efx);
1090 efx->state = STATE_UNINIT;
1091 rtnl_unlock();
1092
1093 if (efx->type->sriov_fini)
1094 efx->type->sriov_fini(efx);
1095
1096 efx_unregister_netdev(efx);
1097
1098 efx_mtd_remove(efx);
1099
1100 efx_pci_remove_main(efx);
1101
1102 efx_fini_io(efx, efx->type->mem_bar(efx));
1103 netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
1104
1105 efx_fini_struct(efx);
1106 free_netdev(efx->net_dev);
1107
1108 pci_disable_pcie_error_reporting(pci_dev);
1109 };
1110
1111 /* NIC VPD information
1112 * Called during probe to display the part number of the
1113 * installed NIC. VPD is potentially very large but this should
1114 * always appear within the first 512 bytes.
1115 */
1116 #define SFC_VPD_LEN 512
1117 static void efx_probe_vpd_strings(struct efx_nic *efx)
1118 {
1119 struct pci_dev *dev = efx->pci_dev;
1120 char vpd_data[SFC_VPD_LEN];
1121 ssize_t vpd_size;
1122 int ro_start, ro_size, i, j;
1123
1124 /* Get the vpd data from the device */
1125 vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data);
1126 if (vpd_size <= 0) {
1127 netif_err(efx, drv, efx->net_dev, "Unable to read VPD\n");
1128 return;
1129 }
1130
1131 /* Get the Read only section */
1132 ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, PCI_VPD_LRDT_RO_DATA);
1133 if (ro_start < 0) {
1134 netif_err(efx, drv, efx->net_dev, "VPD Read-only not found\n");
1135 return;
1136 }
1137
1138 ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]);
1139 j = ro_size;
1140 i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
1141 if (i + j > vpd_size)
1142 j = vpd_size - i;
1143
1144 /* Get the Part number */
1145 i = pci_vpd_find_info_keyword(vpd_data, i, j, "PN");
1146 if (i < 0) {
1147 netif_err(efx, drv, efx->net_dev, "Part number not found\n");
1148 return;
1149 }
1150
1151 j = pci_vpd_info_field_size(&vpd_data[i]);
1152 i += PCI_VPD_INFO_FLD_HDR_SIZE;
1153 if (i + j > vpd_size) {
1154 netif_err(efx, drv, efx->net_dev, "Incomplete part number\n");
1155 return;
1156 }
1157
1158 netif_info(efx, drv, efx->net_dev,
1159 "Part Number : %.*s\n", j, &vpd_data[i]);
1160
1161 i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
1162 j = ro_size;
1163 i = pci_vpd_find_info_keyword(vpd_data, i, j, "SN");
1164 if (i < 0) {
1165 netif_err(efx, drv, efx->net_dev, "Serial number not found\n");
1166 return;
1167 }
1168
1169 j = pci_vpd_info_field_size(&vpd_data[i]);
1170 i += PCI_VPD_INFO_FLD_HDR_SIZE;
1171 if (i + j > vpd_size) {
1172 netif_err(efx, drv, efx->net_dev, "Incomplete serial number\n");
1173 return;
1174 }
1175
1176 efx->vpd_sn = kmalloc(j + 1, GFP_KERNEL);
1177 if (!efx->vpd_sn)
1178 return;
1179
1180 snprintf(efx->vpd_sn, j + 1, "%s", &vpd_data[i]);
1181 }
1182
1183
1184 /* Main body of NIC initialisation
1185 * This is called at module load (or hotplug insertion, theoretically).
1186 */
1187 static int efx_pci_probe_main(struct efx_nic *efx)
1188 {
1189 int rc;
1190
1191 /* Do start-of-day initialisation */
1192 rc = efx_probe_all(efx);
1193 if (rc)
1194 goto fail1;
1195
1196 efx_init_napi(efx);
1197
1198 down_write(&efx->filter_sem);
1199 rc = efx->type->init(efx);
1200 up_write(&efx->filter_sem);
1201 if (rc) {
1202 netif_err(efx, probe, efx->net_dev,
1203 "failed to initialise NIC\n");
1204 goto fail3;
1205 }
1206
1207 rc = efx_init_port(efx);
1208 if (rc) {
1209 netif_err(efx, probe, efx->net_dev,
1210 "failed to initialise port\n");
1211 goto fail4;
1212 }
1213
1214 rc = efx_nic_init_interrupt(efx);
1215 if (rc)
1216 goto fail5;
1217
1218 efx_set_interrupt_affinity(efx);
1219 rc = efx_enable_interrupts(efx);
1220 if (rc)
1221 goto fail6;
1222
1223 return 0;
1224
1225 fail6:
1226 efx_clear_interrupt_affinity(efx);
1227 efx_nic_fini_interrupt(efx);
1228 fail5:
1229 efx_fini_port(efx);
1230 fail4:
1231 efx->type->fini(efx);
1232 fail3:
1233 efx_fini_napi(efx);
1234 efx_remove_all(efx);
1235 fail1:
1236 return rc;
1237 }
1238
1239 static int efx_pci_probe_post_io(struct efx_nic *efx)
1240 {
1241 struct net_device *net_dev = efx->net_dev;
1242 int rc = efx_pci_probe_main(efx);
1243
1244 if (rc)
1245 return rc;
1246
1247 if (efx->type->sriov_init) {
1248 rc = efx->type->sriov_init(efx);
1249 if (rc)
1250 netif_err(efx, probe, efx->net_dev,
1251 "SR-IOV can't be enabled rc %d\n", rc);
1252 }
1253
1254 /* Determine netdevice features */
1255 net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
1256 NETIF_F_TSO | NETIF_F_RXCSUM | NETIF_F_RXALL);
1257 if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
1258 net_dev->features |= NETIF_F_TSO6;
1259 /* Check whether device supports TSO */
1260 if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
1261 net_dev->features &= ~NETIF_F_ALL_TSO;
1262 /* Mask for features that also apply to VLAN devices */
1263 net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
1264 NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
1265 NETIF_F_RXCSUM);
1266
1267 net_dev->hw_features |= net_dev->features & ~efx->fixed_features;
1268
1269 /* Disable receiving frames with bad FCS, by default. */
1270 net_dev->features &= ~NETIF_F_RXALL;
1271
1272 /* Disable VLAN filtering by default. It may be enforced if
1273 * the feature is fixed (i.e. VLAN filters are required to
1274 * receive VLAN tagged packets due to vPort restrictions).
1275 */
1276 net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1277 net_dev->features |= efx->fixed_features;
1278
1279 rc = efx_register_netdev(efx);
1280 if (!rc)
1281 return 0;
1282
1283 efx_pci_remove_main(efx);
1284 return rc;
1285 }
1286
1287 /* NIC initialisation
1288 *
1289 * This is called at module load (or hotplug insertion,
1290 * theoretically). It sets up PCI mappings, resets the NIC,
1291 * sets up and registers the network devices with the kernel and hooks
1292 * the interrupt service routine. It does not prepare the device for
1293 * transmission; this is left to the first time one of the network
1294 * interfaces is brought up (i.e. efx_net_open).
1295 */
1296 static int efx_pci_probe(struct pci_dev *pci_dev,
1297 const struct pci_device_id *entry)
1298 {
1299 struct net_device *net_dev;
1300 struct efx_nic *efx;
1301 int rc;
1302
1303 /* Allocate and initialise a struct net_device and struct efx_nic */
1304 net_dev = alloc_etherdev_mqs(sizeof(*efx), EFX_MAX_CORE_TX_QUEUES,
1305 EFX_MAX_RX_QUEUES);
1306 if (!net_dev)
1307 return -ENOMEM;
1308 efx = netdev_priv(net_dev);
1309 efx->type = (const struct efx_nic_type *) entry->driver_data;
1310 efx->fixed_features |= NETIF_F_HIGHDMA;
1311
1312 pci_set_drvdata(pci_dev, efx);
1313 SET_NETDEV_DEV(net_dev, &pci_dev->dev);
1314 rc = efx_init_struct(efx, pci_dev, net_dev);
1315 if (rc)
1316 goto fail1;
1317
1318 netif_info(efx, probe, efx->net_dev,
1319 "Solarflare NIC detected\n");
1320
1321 if (!efx->type->is_vf)
1322 efx_probe_vpd_strings(efx);
1323
1324 /* Set up basic I/O (BAR mappings etc) */
1325 rc = efx_init_io(efx, efx->type->mem_bar(efx), efx->type->max_dma_mask,
1326 efx->type->mem_map_size(efx));
1327 if (rc)
1328 goto fail2;
1329
1330 rc = efx_pci_probe_post_io(efx);
1331 if (rc) {
1332 /* On failure, retry once immediately.
1333 * If we aborted probe due to a scheduled reset, dismiss it.
1334 */
1335 efx->reset_pending = 0;
1336 rc = efx_pci_probe_post_io(efx);
1337 if (rc) {
1338 /* On another failure, retry once more
1339 * after a 50-305ms delay.
1340 */
1341 unsigned char r;
1342
1343 get_random_bytes(&r, 1);
1344 msleep((unsigned int)r + 50);
1345 efx->reset_pending = 0;
1346 rc = efx_pci_probe_post_io(efx);
1347 }
1348 }
1349 if (rc)
1350 goto fail3;
1351
1352 netif_dbg(efx, probe, efx->net_dev, "initialisation successful\n");
1353
1354 /* Try to create MTDs, but allow this to fail */
1355 rtnl_lock();
1356 rc = efx_mtd_probe(efx);
1357 rtnl_unlock();
1358 if (rc && rc != -EPERM)
1359 netif_warn(efx, probe, efx->net_dev,
1360 "failed to create MTDs (%d)\n", rc);
1361
1362 (void)pci_enable_pcie_error_reporting(pci_dev);
1363
1364 if (efx->type->udp_tnl_push_ports)
1365 efx->type->udp_tnl_push_ports(efx);
1366
1367 return 0;
1368
1369 fail3:
1370 efx_fini_io(efx, efx->type->mem_bar(efx));
1371 fail2:
1372 efx_fini_struct(efx);
1373 fail1:
1374 WARN_ON(rc > 0);
1375 netif_dbg(efx, drv, efx->net_dev, "initialisation failed. rc=%d\n", rc);
1376 free_netdev(net_dev);
1377 return rc;
1378 }
1379
1380 /* efx_pci_sriov_configure returns the actual number of Virtual Functions
1381 * enabled on success
1382 */
1383 #ifdef CONFIG_SFC_SRIOV
1384 static int efx_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
1385 {
1386 int rc;
1387 struct efx_nic *efx = pci_get_drvdata(dev);
1388
1389 if (efx->type->sriov_configure) {
1390 rc = efx->type->sriov_configure(efx, num_vfs);
1391 if (rc)
1392 return rc;
1393 else
1394 return num_vfs;
1395 } else
1396 return -EOPNOTSUPP;
1397 }
1398 #endif
1399
1400 static int efx_pm_freeze(struct device *dev)
1401 {
1402 struct efx_nic *efx = dev_get_drvdata(dev);
1403
1404 rtnl_lock();
1405
1406 if (efx->state != STATE_DISABLED) {
1407 efx->state = STATE_UNINIT;
1408
1409 efx_device_detach_sync(efx);
1410
1411 efx_stop_all(efx);
1412 efx_disable_interrupts(efx);
1413 }
1414
1415 rtnl_unlock();
1416
1417 return 0;
1418 }
1419
1420 static int efx_pm_thaw(struct device *dev)
1421 {
1422 int rc;
1423 struct efx_nic *efx = dev_get_drvdata(dev);
1424
1425 rtnl_lock();
1426
1427 if (efx->state != STATE_DISABLED) {
1428 rc = efx_enable_interrupts(efx);
1429 if (rc)
1430 goto fail;
1431
1432 mutex_lock(&efx->mac_lock);
1433 efx->phy_op->reconfigure(efx);
1434 mutex_unlock(&efx->mac_lock);
1435
1436 efx_start_all(efx);
1437
1438 efx_device_attach_if_not_resetting(efx);
1439
1440 efx->state = STATE_READY;
1441
1442 efx->type->resume_wol(efx);
1443 }
1444
1445 rtnl_unlock();
1446
1447 /* Reschedule any quenched resets scheduled during efx_pm_freeze() */
1448 efx_queue_reset_work(efx);
1449
1450 return 0;
1451
1452 fail:
1453 rtnl_unlock();
1454
1455 return rc;
1456 }
1457
1458 static int efx_pm_poweroff(struct device *dev)
1459 {
1460 struct pci_dev *pci_dev = to_pci_dev(dev);
1461 struct efx_nic *efx = pci_get_drvdata(pci_dev);
1462
1463 efx->type->fini(efx);
1464
1465 efx->reset_pending = 0;
1466
1467 pci_save_state(pci_dev);
1468 return pci_set_power_state(pci_dev, PCI_D3hot);
1469 }
1470
1471 /* Used for both resume and restore */
1472 static int efx_pm_resume(struct device *dev)
1473 {
1474 struct pci_dev *pci_dev = to_pci_dev(dev);
1475 struct efx_nic *efx = pci_get_drvdata(pci_dev);
1476 int rc;
1477
1478 rc = pci_set_power_state(pci_dev, PCI_D0);
1479 if (rc)
1480 return rc;
1481 pci_restore_state(pci_dev);
1482 rc = pci_enable_device(pci_dev);
1483 if (rc)
1484 return rc;
1485 pci_set_master(efx->pci_dev);
1486 rc = efx->type->reset(efx, RESET_TYPE_ALL);
1487 if (rc)
1488 return rc;
1489 down_write(&efx->filter_sem);
1490 rc = efx->type->init(efx);
1491 up_write(&efx->filter_sem);
1492 if (rc)
1493 return rc;
1494 rc = efx_pm_thaw(dev);
1495 return rc;
1496 }
1497
1498 static int efx_pm_suspend(struct device *dev)
1499 {
1500 int rc;
1501
1502 efx_pm_freeze(dev);
1503 rc = efx_pm_poweroff(dev);
1504 if (rc)
1505 efx_pm_resume(dev);
1506 return rc;
1507 }
1508
1509 static const struct dev_pm_ops efx_pm_ops = {
1510 .suspend = efx_pm_suspend,
1511 .resume = efx_pm_resume,
1512 .freeze = efx_pm_freeze,
1513 .thaw = efx_pm_thaw,
1514 .poweroff = efx_pm_poweroff,
1515 .restore = efx_pm_resume,
1516 };
1517
1518 /* A PCI error affecting this device was detected.
1519 * At this point MMIO and DMA may be disabled.
1520 * Stop the software path and request a slot reset.
1521 */
1522 static pci_ers_result_t efx_io_error_detected(struct pci_dev *pdev,
1523 enum pci_channel_state state)
1524 {
1525 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
1526 struct efx_nic *efx = pci_get_drvdata(pdev);
1527
1528 if (state == pci_channel_io_perm_failure)
1529 return PCI_ERS_RESULT_DISCONNECT;
1530
1531 rtnl_lock();
1532
1533 if (efx->state != STATE_DISABLED) {
1534 efx->state = STATE_RECOVERY;
1535 efx->reset_pending = 0;
1536
1537 efx_device_detach_sync(efx);
1538
1539 efx_stop_all(efx);
1540 efx_disable_interrupts(efx);
1541
1542 status = PCI_ERS_RESULT_NEED_RESET;
1543 } else {
1544 /* If the interface is disabled we don't want to do anything
1545 * with it.
1546 */
1547 status = PCI_ERS_RESULT_RECOVERED;
1548 }
1549
1550 rtnl_unlock();
1551
1552 pci_disable_device(pdev);
1553
1554 return status;
1555 }
1556
1557 /* Fake a successful reset, which will be performed later in efx_io_resume. */
1558 static pci_ers_result_t efx_io_slot_reset(struct pci_dev *pdev)
1559 {
1560 struct efx_nic *efx = pci_get_drvdata(pdev);
1561 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
1562
1563 if (pci_enable_device(pdev)) {
1564 netif_err(efx, hw, efx->net_dev,
1565 "Cannot re-enable PCI device after reset.\n");
1566 status = PCI_ERS_RESULT_DISCONNECT;
1567 }
1568
1569 return status;
1570 }
1571
1572 /* Perform the actual reset and resume I/O operations. */
1573 static void efx_io_resume(struct pci_dev *pdev)
1574 {
1575 struct efx_nic *efx = pci_get_drvdata(pdev);
1576 int rc;
1577
1578 rtnl_lock();
1579
1580 if (efx->state == STATE_DISABLED)
1581 goto out;
1582
1583 rc = efx_reset(efx, RESET_TYPE_ALL);
1584 if (rc) {
1585 netif_err(efx, hw, efx->net_dev,
1586 "efx_reset failed after PCI error (%d)\n", rc);
1587 } else {
1588 efx->state = STATE_READY;
1589 netif_dbg(efx, hw, efx->net_dev,
1590 "Done resetting and resuming IO after PCI error.\n");
1591 }
1592
1593 out:
1594 rtnl_unlock();
1595 }
1596
1597 /* For simplicity and reliability, we always require a slot reset and try to
1598 * reset the hardware when a pci error affecting the device is detected.
1599 * We leave both the link_reset and mmio_enabled callback unimplemented:
1600 * with our request for slot reset the mmio_enabled callback will never be
1601 * called, and the link_reset callback is not used by AER or EEH mechanisms.
1602 */
1603 static const struct pci_error_handlers efx_err_handlers = {
1604 .error_detected = efx_io_error_detected,
1605 .slot_reset = efx_io_slot_reset,
1606 .resume = efx_io_resume,
1607 };
1608
1609 static struct pci_driver efx_pci_driver = {
1610 .name = KBUILD_MODNAME,
1611 .id_table = efx_pci_table,
1612 .probe = efx_pci_probe,
1613 .remove = efx_pci_remove,
1614 .driver.pm = &efx_pm_ops,
1615 .err_handler = &efx_err_handlers,
1616 #ifdef CONFIG_SFC_SRIOV
1617 .sriov_configure = efx_pci_sriov_configure,
1618 #endif
1619 };
1620
1621 /**************************************************************************
1622 *
1623 * Kernel module interface
1624 *
1625 *************************************************************************/
1626
1627 static int __init efx_init_module(void)
1628 {
1629 int rc;
1630
1631 printk(KERN_INFO "Solarflare NET driver v" EFX_DRIVER_VERSION "\n");
1632
1633 rc = register_netdevice_notifier(&efx_netdev_notifier);
1634 if (rc)
1635 goto err_notifier;
1636
1637 #ifdef CONFIG_SFC_SRIOV
1638 rc = efx_init_sriov();
1639 if (rc)
1640 goto err_sriov;
1641 #endif
1642
1643 rc = efx_create_reset_workqueue();
1644 if (rc)
1645 goto err_reset;
1646
1647 rc = pci_register_driver(&efx_pci_driver);
1648 if (rc < 0)
1649 goto err_pci;
1650
1651 return 0;
1652
1653 err_pci:
1654 efx_destroy_reset_workqueue();
1655 err_reset:
1656 #ifdef CONFIG_SFC_SRIOV
1657 efx_fini_sriov();
1658 err_sriov:
1659 #endif
1660 unregister_netdevice_notifier(&efx_netdev_notifier);
1661 err_notifier:
1662 return rc;
1663 }
1664
1665 static void __exit efx_exit_module(void)
1666 {
1667 printk(KERN_INFO "Solarflare NET driver unloading\n");
1668
1669 pci_unregister_driver(&efx_pci_driver);
1670 efx_destroy_reset_workqueue();
1671 #ifdef CONFIG_SFC_SRIOV
1672 efx_fini_sriov();
1673 #endif
1674 unregister_netdevice_notifier(&efx_netdev_notifier);
1675
1676 }
1677
1678 module_init(efx_init_module);
1679 module_exit(efx_exit_module);
1680
1681 MODULE_AUTHOR("Solarflare Communications and "
1682 "Michael Brown <mbrown@fensystems.co.uk>");
1683 MODULE_DESCRIPTION("Solarflare network driver");
1684 MODULE_LICENSE("GPL");
1685 MODULE_DEVICE_TABLE(pci, efx_pci_table);
1686 MODULE_VERSION(EFX_DRIVER_VERSION);
Linux with added FPC-III support