linux/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright(c) 2013 - 2019 Intel Corporation. */
   3
   4#include <linux/module.h>
   5#include <linux/interrupt.h>
   6#include <linux/aer.h>
   7
   8#include "fm10k.h"
   9
  10static const struct fm10k_info *fm10k_info_tbl[] = {
  11        [fm10k_device_pf] = &fm10k_pf_info,
  12        [fm10k_device_vf] = &fm10k_vf_info,
  13};
  14
  15/*
  16 * fm10k_pci_tbl - PCI Device ID Table
  17 *
  18 * Wildcard entries (PCI_ANY_ID) should come last
  19 * Last entry must be all 0s
  20 *
  21 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  22 *   Class, Class Mask, private data (not used) }
  23 */
  24static const struct pci_device_id fm10k_pci_tbl[] = {
  25        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_PF), fm10k_device_pf },
  26        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_SDI_FM10420_QDA2), fm10k_device_pf },
  27        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_SDI_FM10420_DA2), fm10k_device_pf },
  28        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_VF), fm10k_device_vf },
  29        /* required last entry */
  30        { 0, }
  31};
  32MODULE_DEVICE_TABLE(pci, fm10k_pci_tbl);
  33
  34u16 fm10k_read_pci_cfg_word(struct fm10k_hw *hw, u32 reg)
  35{
  36        struct fm10k_intfc *interface = hw->back;
  37        u16 value = 0;
  38
  39        if (FM10K_REMOVED(hw->hw_addr))
  40                return ~value;
  41
  42        pci_read_config_word(interface->pdev, reg, &value);
  43        if (value == 0xFFFF)
  44                fm10k_write_flush(hw);
  45
  46        return value;
  47}
  48
  49u32 fm10k_read_reg(struct fm10k_hw *hw, int reg)
  50{
  51        u32 __iomem *hw_addr = READ_ONCE(hw->hw_addr);
  52        u32 value = 0;
  53
  54        if (FM10K_REMOVED(hw_addr))
  55                return ~value;
  56
  57        value = readl(&hw_addr[reg]);
  58        if (!(~value) && (!reg || !(~readl(hw_addr)))) {
  59                struct fm10k_intfc *interface = hw->back;
  60                struct net_device *netdev = interface->netdev;
  61
  62                hw->hw_addr = NULL;
  63                netif_device_detach(netdev);
  64                netdev_err(netdev, "PCIe link lost, device now detached\n");
  65        }
  66
  67        return value;
  68}
  69
  70static int fm10k_hw_ready(struct fm10k_intfc *interface)
  71{
  72        struct fm10k_hw *hw = &interface->hw;
  73
  74        fm10k_write_flush(hw);
  75
  76        return FM10K_REMOVED(hw->hw_addr) ? -ENODEV : 0;
  77}
  78
  79/**
  80 * fm10k_macvlan_schedule - Schedule MAC/VLAN queue task
  81 * @interface: fm10k private interface structure
  82 *
  83 * Schedule the MAC/VLAN queue monitor task. If the MAC/VLAN task cannot be
  84 * started immediately, request that it be restarted when possible.
  85 */
  86void fm10k_macvlan_schedule(struct fm10k_intfc *interface)
  87{
  88        /* Avoid processing the MAC/VLAN queue when the service task is
  89         * disabled, or when we're resetting the device.
  90         */
  91        if (!test_bit(__FM10K_MACVLAN_DISABLE, interface->state) &&
  92            !test_and_set_bit(__FM10K_MACVLAN_SCHED, interface->state)) {
  93                clear_bit(__FM10K_MACVLAN_REQUEST, interface->state);
  94                /* We delay the actual start of execution in order to allow
  95                 * multiple MAC/VLAN updates to accumulate before handling
  96                 * them, and to allow some time to let the mailbox drain
  97                 * between runs.
  98                 */
  99                queue_delayed_work(fm10k_workqueue,
 100                                   &interface->macvlan_task, 10);
 101        } else {
 102                set_bit(__FM10K_MACVLAN_REQUEST, interface->state);
 103        }
 104}
 105
 106/**
 107 * fm10k_stop_macvlan_task - Stop the MAC/VLAN queue monitor
 108 * @interface: fm10k private interface structure
 109 *
 110 * Wait until the MAC/VLAN queue task has stopped, and cancel any future
 111 * requests.
 112 */
 113static void fm10k_stop_macvlan_task(struct fm10k_intfc *interface)
 114{
 115        /* Disable the MAC/VLAN work item */
 116        set_bit(__FM10K_MACVLAN_DISABLE, interface->state);
 117
 118        /* Make sure we waited until any current invocations have stopped */
 119        cancel_delayed_work_sync(&interface->macvlan_task);
 120
 121        /* We set the __FM10K_MACVLAN_SCHED bit when we schedule the task.
 122         * However, it may not be unset of the MAC/VLAN task never actually
 123         * got a chance to run. Since we've canceled the task here, and it
 124         * cannot be rescheuled right now, we need to ensure the scheduled bit
 125         * gets unset.
 126         */
 127        clear_bit(__FM10K_MACVLAN_SCHED, interface->state);
 128}
 129
 130/**
 131 * fm10k_resume_macvlan_task - Restart the MAC/VLAN queue monitor
 132 * @interface: fm10k private interface structure
 133 *
 134 * Clear the __FM10K_MACVLAN_DISABLE bit and, if a request occurred, schedule
 135 * the MAC/VLAN work monitor.
 136 */
 137static void fm10k_resume_macvlan_task(struct fm10k_intfc *interface)
 138{
 139        /* Re-enable the MAC/VLAN work item */
 140        clear_bit(__FM10K_MACVLAN_DISABLE, interface->state);
 141
 142        /* We might have received a MAC/VLAN request while disabled. If so,
 143         * kick off the queue now.
 144         */
 145        if (test_bit(__FM10K_MACVLAN_REQUEST, interface->state))
 146                fm10k_macvlan_schedule(interface);
 147}
 148
 149void fm10k_service_event_schedule(struct fm10k_intfc *interface)
 150{
 151        if (!test_bit(__FM10K_SERVICE_DISABLE, interface->state) &&
 152            !test_and_set_bit(__FM10K_SERVICE_SCHED, interface->state)) {
 153                clear_bit(__FM10K_SERVICE_REQUEST, interface->state);
 154                queue_work(fm10k_workqueue, &interface->service_task);
 155        } else {
 156                set_bit(__FM10K_SERVICE_REQUEST, interface->state);
 157        }
 158}
 159
 160static void fm10k_service_event_complete(struct fm10k_intfc *interface)
 161{
 162        WARN_ON(!test_bit(__FM10K_SERVICE_SCHED, interface->state));
 163
 164        /* flush memory to make sure state is correct before next watchog */
 165        smp_mb__before_atomic();
 166        clear_bit(__FM10K_SERVICE_SCHED, interface->state);
 167
 168        /* If a service event was requested since we started, immediately
 169         * re-schedule now. This ensures we don't drop a request until the
 170         * next timer event.
 171         */
 172        if (test_bit(__FM10K_SERVICE_REQUEST, interface->state))
 173                fm10k_service_event_schedule(interface);
 174}
 175
 176static void fm10k_stop_service_event(struct fm10k_intfc *interface)
 177{
 178        set_bit(__FM10K_SERVICE_DISABLE, interface->state);
 179        cancel_work_sync(&interface->service_task);
 180
 181        /* It's possible that cancel_work_sync stopped the service task from
 182         * running before it could actually start. In this case the
 183         * __FM10K_SERVICE_SCHED bit will never be cleared. Since we know that
 184         * the service task cannot be running at this point, we need to clear
 185         * the scheduled bit, as otherwise the service task may never be
 186         * restarted.
 187         */
 188        clear_bit(__FM10K_SERVICE_SCHED, interface->state);
 189}
 190
 191static void fm10k_start_service_event(struct fm10k_intfc *interface)
 192{
 193        clear_bit(__FM10K_SERVICE_DISABLE, interface->state);
 194        fm10k_service_event_schedule(interface);
 195}
 196
 197/**
 198 * fm10k_service_timer - Timer Call-back
 199 * @t: pointer to timer data
 200 **/
 201static void fm10k_service_timer(struct timer_list *t)
 202{
 203        struct fm10k_intfc *interface = from_timer(interface, t,
 204                                                   service_timer);
 205
 206        /* Reset the timer */
 207        mod_timer(&interface->service_timer, (HZ * 2) + jiffies);
 208
 209        fm10k_service_event_schedule(interface);
 210}
 211
 212/**
 213 * fm10k_prepare_for_reset - Prepare the driver and device for a pending reset
 214 * @interface: fm10k private data structure
 215 *
 216 * This function prepares for a device reset by shutting as much down as we
 217 * can. It does nothing and returns false if __FM10K_RESETTING was already set
 218 * prior to calling this function. It returns true if it actually did work.
 219 */
 220static bool fm10k_prepare_for_reset(struct fm10k_intfc *interface)
 221{
 222        struct net_device *netdev = interface->netdev;
 223
 224        /* put off any impending NetWatchDogTimeout */
 225        netif_trans_update(netdev);
 226
 227        /* Nothing to do if a reset is already in progress */
 228        if (test_and_set_bit(__FM10K_RESETTING, interface->state))
 229                return false;
 230
 231        /* As the MAC/VLAN task will be accessing registers it must not be
 232         * running while we reset. Although the task will not be scheduled
 233         * once we start resetting it may already be running
 234         */
 235        fm10k_stop_macvlan_task(interface);
 236
 237        rtnl_lock();
 238
 239        fm10k_iov_suspend(interface->pdev);
 240
 241        if (netif_running(netdev))
 242                fm10k_close(netdev);
 243
 244        fm10k_mbx_free_irq(interface);
 245
 246        /* free interrupts */
 247        fm10k_clear_queueing_scheme(interface);
 248
 249        /* delay any future reset requests */
 250        interface->last_reset = jiffies + (10 * HZ);
 251
 252        rtnl_unlock();
 253
 254        return true;
 255}
 256
 257static int fm10k_handle_reset(struct fm10k_intfc *interface)
 258{
 259        struct net_device *netdev = interface->netdev;
 260        struct fm10k_hw *hw = &interface->hw;
 261        int err;
 262
 263        WARN_ON(!test_bit(__FM10K_RESETTING, interface->state));
 264
 265        rtnl_lock();
 266
 267        pci_set_master(interface->pdev);
 268
 269        /* reset and initialize the hardware so it is in a known state */
 270        err = hw->mac.ops.reset_hw(hw);
 271        if (err) {
 272                dev_err(&interface->pdev->dev, "reset_hw failed: %d\n", err);
 273                goto reinit_err;
 274        }
 275
 276        err = hw->mac.ops.init_hw(hw);
 277        if (err) {
 278                dev_err(&interface->pdev->dev, "init_hw failed: %d\n", err);
 279                goto reinit_err;
 280        }
 281
 282        err = fm10k_init_queueing_scheme(interface);
 283        if (err) {
 284                dev_err(&interface->pdev->dev,
 285                        "init_queueing_scheme failed: %d\n", err);
 286                goto reinit_err;
 287        }
 288
 289        /* re-associate interrupts */
 290        err = fm10k_mbx_request_irq(interface);
 291        if (err)
 292                goto err_mbx_irq;
 293
 294        err = fm10k_hw_ready(interface);
 295        if (err)
 296                goto err_open;
 297
 298        /* update hardware address for VFs if perm_addr has changed */
 299        if (hw->mac.type == fm10k_mac_vf) {
 300                if (is_valid_ether_addr(hw->mac.perm_addr)) {
 301                        ether_addr_copy(hw->mac.addr, hw->mac.perm_addr);
 302                        ether_addr_copy(netdev->perm_addr, hw->mac.perm_addr);
 303                        ether_addr_copy(netdev->dev_addr, hw->mac.perm_addr);
 304                        netdev->addr_assign_type &= ~NET_ADDR_RANDOM;
 305                }
 306
 307                if (hw->mac.vlan_override)
 308                        netdev->features &= ~NETIF_F_HW_VLAN_CTAG_RX;
 309                else
 310                        netdev->features |= NETIF_F_HW_VLAN_CTAG_RX;
 311        }
 312
 313        err = netif_running(netdev) ? fm10k_open(netdev) : 0;
 314        if (err)
 315                goto err_open;
 316
 317        fm10k_iov_resume(interface->pdev);
 318
 319        rtnl_unlock();
 320
 321        fm10k_resume_macvlan_task(interface);
 322
 323        clear_bit(__FM10K_RESETTING, interface->state);
 324
 325        return err;
 326err_open:
 327        fm10k_mbx_free_irq(interface);
 328err_mbx_irq:
 329        fm10k_clear_queueing_scheme(interface);
 330reinit_err:
 331        netif_device_detach(netdev);
 332
 333        rtnl_unlock();
 334
 335        clear_bit(__FM10K_RESETTING, interface->state);
 336
 337        return err;
 338}
 339
 340static void fm10k_detach_subtask(struct fm10k_intfc *interface)
 341{
 342        struct net_device *netdev = interface->netdev;
 343        u32 __iomem *hw_addr;
 344        u32 value;
 345
 346        /* do nothing if netdev is still present or hw_addr is set */
 347        if (netif_device_present(netdev) || interface->hw.hw_addr)
 348                return;
 349
 350        /* We've lost the PCIe register space, and can no longer access the
 351         * device. Shut everything except the detach subtask down and prepare
 352         * to reset the device in case we recover. If we actually prepare for
 353         * reset, indicate that we're detached.
 354         */
 355        if (fm10k_prepare_for_reset(interface))
 356                set_bit(__FM10K_RESET_DETACHED, interface->state);
 357
 358        /* check the real address space to see if we've recovered */
 359        hw_addr = READ_ONCE(interface->uc_addr);
 360        value = readl(hw_addr);
 361        if (~value) {
 362                int err;
 363
 364                /* Make sure the reset was initiated because we detached,
 365                 * otherwise we might race with a different reset flow.
 366                 */
 367                if (!test_and_clear_bit(__FM10K_RESET_DETACHED,
 368                                        interface->state))
 369                        return;
 370
 371                /* Restore the hardware address */
 372                interface->hw.hw_addr = interface->uc_addr;
 373
 374                /* PCIe link has been restored, and the device is active
 375                 * again. Restore everything and reset the device.
 376                 */
 377                err = fm10k_handle_reset(interface);
 378                if (err) {
 379                        netdev_err(netdev, "Unable to reset device: %d\n", err);
 380                        interface->hw.hw_addr = NULL;
 381                        return;
 382                }
 383
 384                /* Re-attach the netdev */
 385                netif_device_attach(netdev);
 386                netdev_warn(netdev, "PCIe link restored, device now attached\n");
 387                return;
 388        }
 389}
 390
 391static void fm10k_reset_subtask(struct fm10k_intfc *interface)
 392{
 393        int err;
 394
 395        if (!test_and_clear_bit(FM10K_FLAG_RESET_REQUESTED,
 396                                interface->flags))
 397                return;
 398
 399        /* If another thread has already prepared to reset the device, we
 400         * should not attempt to handle a reset here, since we'd race with
 401         * that thread. This may happen if we suspend the device or if the
 402         * PCIe link is lost. In this case, we'll just ignore the RESET
 403         * request, as it will (eventually) be taken care of when the thread
 404         * which actually started the reset is finished.
 405         */
 406        if (!fm10k_prepare_for_reset(interface))
 407                return;
 408
 409        netdev_err(interface->netdev, "Reset interface\n");
 410
 411        err = fm10k_handle_reset(interface);
 412        if (err)
 413                dev_err(&interface->pdev->dev,
 414                        "fm10k_handle_reset failed: %d\n", err);
 415}
 416
 417/**
 418 * fm10k_configure_swpri_map - Configure Receive SWPRI to PC mapping
 419 * @interface: board private structure
 420 *
 421 * Configure the SWPRI to PC mapping for the port.
 422 **/
 423static void fm10k_configure_swpri_map(struct fm10k_intfc *interface)
 424{
 425        struct net_device *netdev = interface->netdev;
 426        struct fm10k_hw *hw = &interface->hw;
 427        int i;
 428
 429        /* clear flag indicating update is needed */
 430        clear_bit(FM10K_FLAG_SWPRI_CONFIG, interface->flags);
 431
 432        /* these registers are only available on the PF */
 433        if (hw->mac.type != fm10k_mac_pf)
 434                return;
 435
 436        /* configure SWPRI to PC map */
 437        for (i = 0; i < FM10K_SWPRI_MAX; i++)
 438                fm10k_write_reg(hw, FM10K_SWPRI_MAP(i),
 439                                netdev_get_prio_tc_map(netdev, i));
 440}
 441
 442/**
 443 * fm10k_watchdog_update_host_state - Update the link status based on host.
 444 * @interface: board private structure
 445 **/
 446static void fm10k_watchdog_update_host_state(struct fm10k_intfc *interface)
 447{
 448        struct fm10k_hw *hw = &interface->hw;
 449        s32 err;
 450
 451        if (test_bit(__FM10K_LINK_DOWN, interface->state)) {
 452                interface->host_ready = false;
 453                if (time_is_after_jiffies(interface->link_down_event))
 454                        return;
 455                clear_bit(__FM10K_LINK_DOWN, interface->state);
 456        }
 457
 458        if (test_bit(FM10K_FLAG_SWPRI_CONFIG, interface->flags)) {
 459                if (rtnl_trylock()) {
 460                        fm10k_configure_swpri_map(interface);
 461                        rtnl_unlock();
 462                }
 463        }
 464
 465        /* lock the mailbox for transmit and receive */
 466        fm10k_mbx_lock(interface);
 467
 468        err = hw->mac.ops.get_host_state(hw, &interface->host_ready);
 469        if (err && time_is_before_jiffies(interface->last_reset))
 470                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
 471
 472        /* free the lock */
 473        fm10k_mbx_unlock(interface);
 474}
 475
 476/**
 477 * fm10k_mbx_subtask - Process upstream and downstream mailboxes
 478 * @interface: board private structure
 479 *
 480 * This function will process both the upstream and downstream mailboxes.
 481 **/
 482static void fm10k_mbx_subtask(struct fm10k_intfc *interface)
 483{
 484        /* If we're resetting, bail out */
 485        if (test_bit(__FM10K_RESETTING, interface->state))
 486                return;
 487
 488        /* process upstream mailbox and update device state */
 489        fm10k_watchdog_update_host_state(interface);
 490
 491        /* process downstream mailboxes */
 492        fm10k_iov_mbx(interface);
 493}
 494
 495/**
 496 * fm10k_watchdog_host_is_ready - Update netdev status based on host ready
 497 * @interface: board private structure
 498 **/
 499static void fm10k_watchdog_host_is_ready(struct fm10k_intfc *interface)
 500{
 501        struct net_device *netdev = interface->netdev;
 502
 503        /* only continue if link state is currently down */
 504        if (netif_carrier_ok(netdev))
 505                return;
 506
 507        netif_info(interface, drv, netdev, "NIC Link is up\n");
 508
 509        netif_carrier_on(netdev);
 510        netif_tx_wake_all_queues(netdev);
 511}
 512
 513/**
 514 * fm10k_watchdog_host_not_ready - Update netdev status based on host not ready
 515 * @interface: board private structure
 516 **/
 517static void fm10k_watchdog_host_not_ready(struct fm10k_intfc *interface)
 518{
 519        struct net_device *netdev = interface->netdev;
 520
 521        /* only continue if link state is currently up */
 522        if (!netif_carrier_ok(netdev))
 523                return;
 524
 525        netif_info(interface, drv, netdev, "NIC Link is down\n");
 526
 527        netif_carrier_off(netdev);
 528        netif_tx_stop_all_queues(netdev);
 529}
 530
 531/**
 532 * fm10k_update_stats - Update the board statistics counters.
 533 * @interface: board private structure
 534 **/
 535void fm10k_update_stats(struct fm10k_intfc *interface)
 536{
 537        struct net_device_stats *net_stats = &interface->netdev->stats;
 538        struct fm10k_hw *hw = &interface->hw;
 539        u64 hw_csum_tx_good = 0, hw_csum_rx_good = 0, rx_length_errors = 0;
 540        u64 rx_switch_errors = 0, rx_drops = 0, rx_pp_errors = 0;
 541        u64 rx_link_errors = 0;
 542        u64 rx_errors = 0, rx_csum_errors = 0, tx_csum_errors = 0;
 543        u64 restart_queue = 0, tx_busy = 0, alloc_failed = 0;
 544        u64 rx_bytes_nic = 0, rx_pkts_nic = 0, rx_drops_nic = 0;
 545        u64 tx_bytes_nic = 0, tx_pkts_nic = 0;
 546        u64 bytes, pkts;
 547        int i;
 548
 549        /* ensure only one thread updates stats at a time */
 550        if (test_and_set_bit(__FM10K_UPDATING_STATS, interface->state))
 551                return;
 552
 553        /* do not allow stats update via service task for next second */
 554        interface->next_stats_update = jiffies + HZ;
 555
 556        /* gather some stats to the interface struct that are per queue */
 557        for (bytes = 0, pkts = 0, i = 0; i < interface->num_tx_queues; i++) {
 558                struct fm10k_ring *tx_ring = READ_ONCE(interface->tx_ring[i]);
 559
 560                if (!tx_ring)
 561                        continue;
 562
 563                restart_queue += tx_ring->tx_stats.restart_queue;
 564                tx_busy += tx_ring->tx_stats.tx_busy;
 565                tx_csum_errors += tx_ring->tx_stats.csum_err;
 566                bytes += tx_ring->stats.bytes;
 567                pkts += tx_ring->stats.packets;
 568                hw_csum_tx_good += tx_ring->tx_stats.csum_good;
 569        }
 570
 571        interface->restart_queue = restart_queue;
 572        interface->tx_busy = tx_busy;
 573        net_stats->tx_bytes = bytes;
 574        net_stats->tx_packets = pkts;
 575        interface->tx_csum_errors = tx_csum_errors;
 576        interface->hw_csum_tx_good = hw_csum_tx_good;
 577
 578        /* gather some stats to the interface struct that are per queue */
 579        for (bytes = 0, pkts = 0, i = 0; i < interface->num_rx_queues; i++) {
 580                struct fm10k_ring *rx_ring = READ_ONCE(interface->rx_ring[i]);
 581
 582                if (!rx_ring)
 583                        continue;
 584
 585                bytes += rx_ring->stats.bytes;
 586                pkts += rx_ring->stats.packets;
 587                alloc_failed += rx_ring->rx_stats.alloc_failed;
 588                rx_csum_errors += rx_ring->rx_stats.csum_err;
 589                rx_errors += rx_ring->rx_stats.errors;
 590                hw_csum_rx_good += rx_ring->rx_stats.csum_good;
 591                rx_switch_errors += rx_ring->rx_stats.switch_errors;
 592                rx_drops += rx_ring->rx_stats.drops;
 593                rx_pp_errors += rx_ring->rx_stats.pp_errors;
 594                rx_link_errors += rx_ring->rx_stats.link_errors;
 595                rx_length_errors += rx_ring->rx_stats.length_errors;
 596        }
 597
 598        net_stats->rx_bytes = bytes;
 599        net_stats->rx_packets = pkts;
 600        interface->alloc_failed = alloc_failed;
 601        interface->rx_csum_errors = rx_csum_errors;
 602        interface->hw_csum_rx_good = hw_csum_rx_good;
 603        interface->rx_switch_errors = rx_switch_errors;
 604        interface->rx_drops = rx_drops;
 605        interface->rx_pp_errors = rx_pp_errors;
 606        interface->rx_link_errors = rx_link_errors;
 607        interface->rx_length_errors = rx_length_errors;
 608
 609        hw->mac.ops.update_hw_stats(hw, &interface->stats);
 610
 611        for (i = 0; i < hw->mac.max_queues; i++) {
 612                struct fm10k_hw_stats_q *q = &interface->stats.q[i];
 613
 614                tx_bytes_nic += q->tx_bytes.count;
 615                tx_pkts_nic += q->tx_packets.count;
 616                rx_bytes_nic += q->rx_bytes.count;
 617                rx_pkts_nic += q->rx_packets.count;
 618                rx_drops_nic += q->rx_drops.count;
 619        }
 620
 621        interface->tx_bytes_nic = tx_bytes_nic;
 622        interface->tx_packets_nic = tx_pkts_nic;
 623        interface->rx_bytes_nic = rx_bytes_nic;
 624        interface->rx_packets_nic = rx_pkts_nic;
 625        interface->rx_drops_nic = rx_drops_nic;
 626
 627        /* Fill out the OS statistics structure */
 628        net_stats->rx_errors = rx_errors;
 629        net_stats->rx_dropped = interface->stats.nodesc_drop.count;
 630
 631        /* Update VF statistics */
 632        fm10k_iov_update_stats(interface);
 633
 634        clear_bit(__FM10K_UPDATING_STATS, interface->state);
 635}
 636
 637/**
 638 * fm10k_watchdog_flush_tx - flush queues on host not ready
 639 * @interface: pointer to the device interface structure
 640 **/
 641static void fm10k_watchdog_flush_tx(struct fm10k_intfc *interface)
 642{
 643        int some_tx_pending = 0;
 644        int i;
 645
 646        /* nothing to do if carrier is up */
 647        if (netif_carrier_ok(interface->netdev))
 648                return;
 649
 650        for (i = 0; i < interface->num_tx_queues; i++) {
 651                struct fm10k_ring *tx_ring = interface->tx_ring[i];
 652
 653                if (tx_ring->next_to_use != tx_ring->next_to_clean) {
 654                        some_tx_pending = 1;
 655                        break;
 656                }
 657        }
 658
 659        /* We've lost link, so the controller stops DMA, but we've got
 660         * queued Tx work that's never going to get done, so reset
 661         * controller to flush Tx.
 662         */
 663        if (some_tx_pending)
 664                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
 665}
 666
 667/**
 668 * fm10k_watchdog_subtask - check and bring link up
 669 * @interface: pointer to the device interface structure
 670 **/
 671static void fm10k_watchdog_subtask(struct fm10k_intfc *interface)
 672{
 673        /* if interface is down do nothing */
 674        if (test_bit(__FM10K_DOWN, interface->state) ||
 675            test_bit(__FM10K_RESETTING, interface->state))
 676                return;
 677
 678        if (interface->host_ready)
 679                fm10k_watchdog_host_is_ready(interface);
 680        else
 681                fm10k_watchdog_host_not_ready(interface);
 682
 683        /* update stats only once every second */
 684        if (time_is_before_jiffies(interface->next_stats_update))
 685                fm10k_update_stats(interface);
 686
 687        /* flush any uncompleted work */
 688        fm10k_watchdog_flush_tx(interface);
 689}
 690
 691/**
 692 * fm10k_check_hang_subtask - check for hung queues and dropped interrupts
 693 * @interface: pointer to the device interface structure
 694 *
 695 * This function serves two purposes.  First it strobes the interrupt lines
 696 * in order to make certain interrupts are occurring.  Secondly it sets the
 697 * bits needed to check for TX hangs.  As a result we should immediately
 698 * determine if a hang has occurred.
 699 */
 700static void fm10k_check_hang_subtask(struct fm10k_intfc *interface)
 701{
 702        /* If we're down or resetting, just bail */
 703        if (test_bit(__FM10K_DOWN, interface->state) ||
 704            test_bit(__FM10K_RESETTING, interface->state))
 705                return;
 706
 707        /* rate limit tx hang checks to only once every 2 seconds */
 708        if (time_is_after_eq_jiffies(interface->next_tx_hang_check))
 709                return;
 710        interface->next_tx_hang_check = jiffies + (2 * HZ);
 711
 712        if (netif_carrier_ok(interface->netdev)) {
 713                int i;
 714
 715                /* Force detection of hung controller */
 716                for (i = 0; i < interface->num_tx_queues; i++)
 717                        set_check_for_tx_hang(interface->tx_ring[i]);
 718
 719                /* Rearm all in-use q_vectors for immediate firing */
 720                for (i = 0; i < interface->num_q_vectors; i++) {
 721                        struct fm10k_q_vector *qv = interface->q_vector[i];
 722
 723                        if (!qv->tx.count && !qv->rx.count)
 724                                continue;
 725                        writel(FM10K_ITR_ENABLE | FM10K_ITR_PENDING2, qv->itr);
 726                }
 727        }
 728}
 729
 730/**
 731 * fm10k_service_task - manages and runs subtasks
 732 * @work: pointer to work_struct containing our data
 733 **/
 734static void fm10k_service_task(struct work_struct *work)
 735{
 736        struct fm10k_intfc *interface;
 737
 738        interface = container_of(work, struct fm10k_intfc, service_task);
 739
 740        /* Check whether we're detached first */
 741        fm10k_detach_subtask(interface);
 742
 743        /* tasks run even when interface is down */
 744        fm10k_mbx_subtask(interface);
 745        fm10k_reset_subtask(interface);
 746
 747        /* tasks only run when interface is up */
 748        fm10k_watchdog_subtask(interface);
 749        fm10k_check_hang_subtask(interface);
 750
 751        /* release lock on service events to allow scheduling next event */
 752        fm10k_service_event_complete(interface);
 753}
 754
 755/**
 756 * fm10k_macvlan_task - send queued MAC/VLAN requests to switch manager
 757 * @work: pointer to work_struct containing our data
 758 *
 759 * This work item handles sending MAC/VLAN updates to the switch manager. When
 760 * the interface is up, it will attempt to queue mailbox messages to the
 761 * switch manager requesting updates for MAC/VLAN pairs. If the Tx fifo of the
 762 * mailbox is full, it will reschedule itself to try again in a short while.
 763 * This ensures that the driver does not overload the switch mailbox with too
 764 * many simultaneous requests, causing an unnecessary reset.
 765 **/
 766static void fm10k_macvlan_task(struct work_struct *work)
 767{
 768        struct fm10k_macvlan_request *item;
 769        struct fm10k_intfc *interface;
 770        struct delayed_work *dwork;
 771        struct list_head *requests;
 772        struct fm10k_hw *hw;
 773        unsigned long flags;
 774
 775        dwork = to_delayed_work(work);
 776        interface = container_of(dwork, struct fm10k_intfc, macvlan_task);
 777        hw = &interface->hw;
 778        requests = &interface->macvlan_requests;
 779
 780        do {
 781                /* Pop the first item off the list */
 782                spin_lock_irqsave(&interface->macvlan_lock, flags);
 783                item = list_first_entry_or_null(requests,
 784                                                struct fm10k_macvlan_request,
 785                                                list);
 786                if (item)
 787                        list_del_init(&item->list);
 788
 789                spin_unlock_irqrestore(&interface->macvlan_lock, flags);
 790
 791                /* We have no more items to process */
 792                if (!item)
 793                        goto done;
 794
 795                fm10k_mbx_lock(interface);
 796
 797                /* Check that we have plenty of space to send the message. We
 798                 * want to ensure that the mailbox stays low enough to avoid a
 799                 * change in the host state, otherwise we may see spurious
 800                 * link up / link down notifications.
 801                 */
 802                if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU + 5)) {
 803                        hw->mbx.ops.process(hw, &hw->mbx);
 804                        set_bit(__FM10K_MACVLAN_REQUEST, interface->state);
 805                        fm10k_mbx_unlock(interface);
 806
 807                        /* Put the request back on the list */
 808                        spin_lock_irqsave(&interface->macvlan_lock, flags);
 809                        list_add(&item->list, requests);
 810                        spin_unlock_irqrestore(&interface->macvlan_lock, flags);
 811                        break;
 812                }
 813
 814                switch (item->type) {
 815                case FM10K_MC_MAC_REQUEST:
 816                        hw->mac.ops.update_mc_addr(hw,
 817                                                   item->mac.glort,
 818                                                   item->mac.addr,
 819                                                   item->mac.vid,
 820                                                   item->set);
 821                        break;
 822                case FM10K_UC_MAC_REQUEST:
 823                        hw->mac.ops.update_uc_addr(hw,
 824                                                   item->mac.glort,
 825                                                   item->mac.addr,
 826                                                   item->mac.vid,
 827                                                   item->set,
 828                                                   0);
 829                        break;
 830                case FM10K_VLAN_REQUEST:
 831                        hw->mac.ops.update_vlan(hw,
 832                                                item->vlan.vid,
 833                                                item->vlan.vsi,
 834                                                item->set);
 835                        break;
 836                default:
 837                        break;
 838                }
 839
 840                fm10k_mbx_unlock(interface);
 841
 842                /* Free the item now that we've sent the update */
 843                kfree(item);
 844        } while (true);
 845
 846done:
 847        WARN_ON(!test_bit(__FM10K_MACVLAN_SCHED, interface->state));
 848
 849        /* flush memory to make sure state is correct */
 850        smp_mb__before_atomic();
 851        clear_bit(__FM10K_MACVLAN_SCHED, interface->state);
 852
 853        /* If a MAC/VLAN request was scheduled since we started, we should
 854         * re-schedule. However, there is no reason to re-schedule if there is
 855         * no work to do.
 856         */
 857        if (test_bit(__FM10K_MACVLAN_REQUEST, interface->state))
 858                fm10k_macvlan_schedule(interface);
 859}
 860
 861/**
 862 * fm10k_configure_tx_ring - Configure Tx ring after Reset
 863 * @interface: board private structure
 864 * @ring: structure containing ring specific data
 865 *
 866 * Configure the Tx descriptor ring after a reset.
 867 **/
 868static void fm10k_configure_tx_ring(struct fm10k_intfc *interface,
 869                                    struct fm10k_ring *ring)
 870{
 871        struct fm10k_hw *hw = &interface->hw;
 872        u64 tdba = ring->dma;
 873        u32 size = ring->count * sizeof(struct fm10k_tx_desc);
 874        u32 txint = FM10K_INT_MAP_DISABLE;
 875        u32 txdctl = BIT(FM10K_TXDCTL_MAX_TIME_SHIFT) | FM10K_TXDCTL_ENABLE;
 876        u8 reg_idx = ring->reg_idx;
 877
 878        /* disable queue to avoid issues while updating state */
 879        fm10k_write_reg(hw, FM10K_TXDCTL(reg_idx), 0);
 880        fm10k_write_flush(hw);
 881
 882        /* possible poll here to verify ring resources have been cleaned */
 883
 884        /* set location and size for descriptor ring */
 885        fm10k_write_reg(hw, FM10K_TDBAL(reg_idx), tdba & DMA_BIT_MASK(32));
 886        fm10k_write_reg(hw, FM10K_TDBAH(reg_idx), tdba >> 32);
 887        fm10k_write_reg(hw, FM10K_TDLEN(reg_idx), size);
 888
 889        /* reset head and tail pointers */
 890        fm10k_write_reg(hw, FM10K_TDH(reg_idx), 0);
 891        fm10k_write_reg(hw, FM10K_TDT(reg_idx), 0);
 892
 893        /* store tail pointer */
 894        ring->tail = &interface->uc_addr[FM10K_TDT(reg_idx)];
 895
 896        /* reset ntu and ntc to place SW in sync with hardware */
 897        ring->next_to_clean = 0;
 898        ring->next_to_use = 0;
 899
 900        /* Map interrupt */
 901        if (ring->q_vector) {
 902                txint = ring->q_vector->v_idx + NON_Q_VECTORS;
 903                txint |= FM10K_INT_MAP_TIMER0;
 904        }
 905
 906        fm10k_write_reg(hw, FM10K_TXINT(reg_idx), txint);
 907
 908        /* enable use of FTAG bit in Tx descriptor, register is RO for VF */
 909        fm10k_write_reg(hw, FM10K_PFVTCTL(reg_idx),
 910                        FM10K_PFVTCTL_FTAG_DESC_ENABLE);
 911
 912        /* Initialize XPS */
 913        if (!test_and_set_bit(__FM10K_TX_XPS_INIT_DONE, ring->state) &&
 914            ring->q_vector)
 915                netif_set_xps_queue(ring->netdev,
 916                                    &ring->q_vector->affinity_mask,
 917                                    ring->queue_index);
 918
 919        /* enable queue */
 920        fm10k_write_reg(hw, FM10K_TXDCTL(reg_idx), txdctl);
 921}
 922
 923/**
 924 * fm10k_enable_tx_ring - Verify Tx ring is enabled after configuration
 925 * @interface: board private structure
 926 * @ring: structure containing ring specific data
 927 *
 928 * Verify the Tx descriptor ring is ready for transmit.
 929 **/
 930static void fm10k_enable_tx_ring(struct fm10k_intfc *interface,
 931                                 struct fm10k_ring *ring)
 932{
 933        struct fm10k_hw *hw = &interface->hw;
 934        int wait_loop = 10;
 935        u32 txdctl;
 936        u8 reg_idx = ring->reg_idx;
 937
 938        /* if we are already enabled just exit */
 939        if (fm10k_read_reg(hw, FM10K_TXDCTL(reg_idx)) & FM10K_TXDCTL_ENABLE)
 940                return;
 941
 942        /* poll to verify queue is enabled */
 943        do {
 944                usleep_range(1000, 2000);
 945                txdctl = fm10k_read_reg(hw, FM10K_TXDCTL(reg_idx));
 946        } while (!(txdctl & FM10K_TXDCTL_ENABLE) && --wait_loop);
 947        if (!wait_loop)
 948                netif_err(interface, drv, interface->netdev,
 949                          "Could not enable Tx Queue %d\n", reg_idx);
 950}
 951
 952/**
 953 * fm10k_configure_tx - Configure Transmit Unit after Reset
 954 * @interface: board private structure
 955 *
 956 * Configure the Tx unit of the MAC after a reset.
 957 **/
 958static void fm10k_configure_tx(struct fm10k_intfc *interface)
 959{
 960        int i;
 961
 962        /* Setup the HW Tx Head and Tail descriptor pointers */
 963        for (i = 0; i < interface->num_tx_queues; i++)
 964                fm10k_configure_tx_ring(interface, interface->tx_ring[i]);
 965
 966        /* poll here to verify that Tx rings are now enabled */
 967        for (i = 0; i < interface->num_tx_queues; i++)
 968                fm10k_enable_tx_ring(interface, interface->tx_ring[i]);
 969}
 970
 971/**
 972 * fm10k_configure_rx_ring - Configure Rx ring after Reset
 973 * @interface: board private structure
 974 * @ring: structure containing ring specific data
 975 *
 976 * Configure the Rx descriptor ring after a reset.
 977 **/
 978static void fm10k_configure_rx_ring(struct fm10k_intfc *interface,
 979                                    struct fm10k_ring *ring)
 980{
 981        u64 rdba = ring->dma;
 982        struct fm10k_hw *hw = &interface->hw;
 983        u32 size = ring->count * sizeof(union fm10k_rx_desc);
 984        u32 rxqctl, rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
 985        u32 srrctl = FM10K_SRRCTL_BUFFER_CHAINING_EN;
 986        u32 rxint = FM10K_INT_MAP_DISABLE;
 987        u8 rx_pause = interface->rx_pause;
 988        u8 reg_idx = ring->reg_idx;
 989
 990        /* disable queue to avoid issues while updating state */
 991        rxqctl = fm10k_read_reg(hw, FM10K_RXQCTL(reg_idx));
 992        rxqctl &= ~FM10K_RXQCTL_ENABLE;
 993        fm10k_write_reg(hw, FM10K_RXQCTL(reg_idx), rxqctl);
 994        fm10k_write_flush(hw);
 995
 996        /* possible poll here to verify ring resources have been cleaned */
 997
 998        /* set location and size for descriptor ring */
 999        fm10k_write_reg(hw, FM10K_RDBAL(reg_idx), rdba & DMA_BIT_MASK(32));
1000        fm10k_write_reg(hw, FM10K_RDBAH(reg_idx), rdba >> 32);
1001        fm10k_write_reg(hw, FM10K_RDLEN(reg_idx), size);
1002
1003        /* reset head and tail pointers */
1004        fm10k_write_reg(hw, FM10K_RDH(reg_idx), 0);
1005        fm10k_write_reg(hw, FM10K_RDT(reg_idx), 0);
1006
1007        /* store tail pointer */
1008        ring->tail = &interface->uc_addr[FM10K_RDT(reg_idx)];
1009
1010        /* reset ntu and ntc to place SW in sync with hardware */
1011        ring->next_to_clean = 0;
1012        ring->next_to_use = 0;
1013        ring->next_to_alloc = 0;
1014
1015        /* Configure the Rx buffer size for one buff without split */
1016        srrctl |= FM10K_RX_BUFSZ >> FM10K_SRRCTL_BSIZEPKT_SHIFT;
1017
1018        /* Configure the Rx ring to suppress loopback packets */
1019        srrctl |= FM10K_SRRCTL_LOOPBACK_SUPPRESS;
1020        fm10k_write_reg(hw, FM10K_SRRCTL(reg_idx), srrctl);
1021
1022        /* Enable drop on empty */
1023#ifdef CONFIG_DCB
1024        if (interface->pfc_en)
1025                rx_pause = interface->pfc_en;
1026#endif
1027        if (!(rx_pause & BIT(ring->qos_pc)))
1028                rxdctl |= FM10K_RXDCTL_DROP_ON_EMPTY;
1029
1030        fm10k_write_reg(hw, FM10K_RXDCTL(reg_idx), rxdctl);
1031
1032        /* assign default VLAN to queue */
1033        ring->vid = hw->mac.default_vid;
1034
1035        /* if we have an active VLAN, disable default VLAN ID */
1036        if (test_bit(hw->mac.default_vid, interface->active_vlans))
1037                ring->vid |= FM10K_VLAN_CLEAR;
1038
1039        /* Map interrupt */
1040        if (ring->q_vector) {
1041                rxint = ring->q_vector->v_idx + NON_Q_VECTORS;
1042                rxint |= FM10K_INT_MAP_TIMER1;
1043        }
1044
1045        fm10k_write_reg(hw, FM10K_RXINT(reg_idx), rxint);
1046
1047        /* enable queue */
1048        rxqctl = fm10k_read_reg(hw, FM10K_RXQCTL(reg_idx));
1049        rxqctl |= FM10K_RXQCTL_ENABLE;
1050        fm10k_write_reg(hw, FM10K_RXQCTL(reg_idx), rxqctl);
1051
1052        /* place buffers on ring for receive data */
1053        fm10k_alloc_rx_buffers(ring, fm10k_desc_unused(ring));
1054}
1055
1056/**
1057 * fm10k_update_rx_drop_en - Configures the drop enable bits for Rx rings
1058 * @interface: board private structure
1059 *
1060 * Configure the drop enable bits for the Rx rings.
1061 **/
1062void fm10k_update_rx_drop_en(struct fm10k_intfc *interface)
1063{
1064        struct fm10k_hw *hw = &interface->hw;
1065        u8 rx_pause = interface->rx_pause;
1066        int i;
1067
1068#ifdef CONFIG_DCB
1069        if (interface->pfc_en)
1070                rx_pause = interface->pfc_en;
1071
1072#endif
1073        for (i = 0; i < interface->num_rx_queues; i++) {
1074                struct fm10k_ring *ring = interface->rx_ring[i];
1075                u32 rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
1076                u8 reg_idx = ring->reg_idx;
1077
1078                if (!(rx_pause & BIT(ring->qos_pc)))
1079                        rxdctl |= FM10K_RXDCTL_DROP_ON_EMPTY;
1080
1081                fm10k_write_reg(hw, FM10K_RXDCTL(reg_idx), rxdctl);
1082        }
1083}
1084
1085/**
1086 * fm10k_configure_dglort - Configure Receive DGLORT after reset
1087 * @interface: board private structure
1088 *
1089 * Configure the DGLORT description and RSS tables.
1090 **/
1091static void fm10k_configure_dglort(struct fm10k_intfc *interface)
1092{
1093        struct fm10k_dglort_cfg dglort = { 0 };
1094        struct fm10k_hw *hw = &interface->hw;
1095        int i;
1096        u32 mrqc;
1097
1098        /* Fill out hash function seeds */
1099        for (i = 0; i < FM10K_RSSRK_SIZE; i++)
1100                fm10k_write_reg(hw, FM10K_RSSRK(0, i), interface->rssrk[i]);
1101
1102        /* Write RETA table to hardware */
1103        for (i = 0; i < FM10K_RETA_SIZE; i++)
1104                fm10k_write_reg(hw, FM10K_RETA(0, i), interface->reta[i]);
1105
1106        /* Generate RSS hash based on packet types, TCP/UDP
1107         * port numbers and/or IPv4/v6 src and dst addresses
1108         */
1109        mrqc = FM10K_MRQC_IPV4 |
1110               FM10K_MRQC_TCP_IPV4 |
1111               FM10K_MRQC_IPV6 |
1112               FM10K_MRQC_TCP_IPV6;
1113
1114        if (test_bit(FM10K_FLAG_RSS_FIELD_IPV4_UDP, interface->flags))
1115                mrqc |= FM10K_MRQC_UDP_IPV4;
1116        if (test_bit(FM10K_FLAG_RSS_FIELD_IPV6_UDP, interface->flags))
1117                mrqc |= FM10K_MRQC_UDP_IPV6;
1118
1119        fm10k_write_reg(hw, FM10K_MRQC(0), mrqc);
1120
1121        /* configure default DGLORT mapping for RSS/DCB */
1122        dglort.inner_rss = 1;
1123        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
1124        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
1125        hw->mac.ops.configure_dglort_map(hw, &dglort);
1126
1127        /* assign GLORT per queue for queue mapped testing */
1128        if (interface->glort_count > 64) {
1129                memset(&dglort, 0, sizeof(dglort));
1130                dglort.inner_rss = 1;
1131                dglort.glort = interface->glort + 64;
1132                dglort.idx = fm10k_dglort_pf_queue;
1133                dglort.queue_l = fls(interface->num_rx_queues - 1);
1134                hw->mac.ops.configure_dglort_map(hw, &dglort);
1135        }
1136
1137        /* assign glort value for RSS/DCB specific to this interface */
1138        memset(&dglort, 0, sizeof(dglort));
1139        dglort.inner_rss = 1;
1140        dglort.glort = interface->glort;
1141        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
1142        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
1143        /* configure DGLORT mapping for RSS/DCB */
1144        dglort.idx = fm10k_dglort_pf_rss;
1145        if (interface->l2_accel)
1146                dglort.shared_l = fls(interface->l2_accel->size);
1147        hw->mac.ops.configure_dglort_map(hw, &dglort);
1148}
1149
1150/**
1151 * fm10k_configure_rx - Configure Receive Unit after Reset
1152 * @interface: board private structure
1153 *
1154 * Configure the Rx unit of the MAC after a reset.
1155 **/
1156static void fm10k_configure_rx(struct fm10k_intfc *interface)
1157{
1158        int i;
1159
1160        /* Configure SWPRI to PC map */
1161        fm10k_configure_swpri_map(interface);
1162
1163        /* Configure RSS and DGLORT map */
1164        fm10k_configure_dglort(interface);
1165
1166        /* Setup the HW Rx Head and Tail descriptor pointers */
1167        for (i = 0; i < interface->num_rx_queues; i++)
1168                fm10k_configure_rx_ring(interface, interface->rx_ring[i]);
1169
1170        /* possible poll here to verify that Rx rings are now enabled */
1171}
1172
1173static void fm10k_napi_enable_all(struct fm10k_intfc *interface)
1174{
1175        struct fm10k_q_vector *q_vector;
1176        int q_idx;
1177
1178        for (q_idx = 0; q_idx < interface->num_q_vectors; q_idx++) {
1179                q_vector = interface->q_vector[q_idx];
1180                napi_enable(&q_vector->napi);
1181        }
1182}
1183
1184static irqreturn_t fm10k_msix_clean_rings(int __always_unused irq, void *data)
1185{
1186        struct fm10k_q_vector *q_vector = data;
1187
1188        if (q_vector->rx.count || q_vector->tx.count)
1189                napi_schedule_irqoff(&q_vector->napi);
1190
1191        return IRQ_HANDLED;
1192}
1193
1194static irqreturn_t fm10k_msix_mbx_vf(int __always_unused irq, void *data)
1195{
1196        struct fm10k_intfc *interface = data;
1197        struct fm10k_hw *hw = &interface->hw;
1198        struct fm10k_mbx_info *mbx = &hw->mbx;
1199
1200        /* re-enable mailbox interrupt and indicate 20us delay */
1201        fm10k_write_reg(hw, FM10K_VFITR(FM10K_MBX_VECTOR),
1202                        (FM10K_MBX_INT_DELAY >> hw->mac.itr_scale) |
1203                        FM10K_ITR_ENABLE);
1204
1205        /* service upstream mailbox */
1206        if (fm10k_mbx_trylock(interface)) {
1207                mbx->ops.process(hw, mbx);
1208                fm10k_mbx_unlock(interface);
1209        }
1210
1211        hw->mac.get_host_state = true;
1212        fm10k_service_event_schedule(interface);
1213
1214        return IRQ_HANDLED;
1215}
1216
1217#define FM10K_ERR_MSG(type) case (type): error = #type; break
1218static void fm10k_handle_fault(struct fm10k_intfc *interface, int type,
1219                               struct fm10k_fault *fault)
1220{
1221        struct pci_dev *pdev = interface->pdev;
1222        struct fm10k_hw *hw = &interface->hw;
1223        struct fm10k_iov_data *iov_data = interface->iov_data;
1224        char *error;
1225
1226        switch (type) {
1227        case FM10K_PCA_FAULT:
1228                switch (fault->type) {
1229                default:
1230                        error = "Unknown PCA error";
1231                        break;
1232                FM10K_ERR_MSG(PCA_NO_FAULT);
1233                FM10K_ERR_MSG(PCA_UNMAPPED_ADDR);
1234                FM10K_ERR_MSG(PCA_BAD_QACCESS_PF);
1235                FM10K_ERR_MSG(PCA_BAD_QACCESS_VF);
1236                FM10K_ERR_MSG(PCA_MALICIOUS_REQ);
1237                FM10K_ERR_MSG(PCA_POISONED_TLP);
1238                FM10K_ERR_MSG(PCA_TLP_ABORT);
1239                }
1240                break;
1241        case FM10K_THI_FAULT:
1242                switch (fault->type) {
1243                default:
1244                        error = "Unknown THI error";
1245                        break;
1246                FM10K_ERR_MSG(THI_NO_FAULT);
1247                FM10K_ERR_MSG(THI_MAL_DIS_Q_FAULT);
1248                }
1249                break;
1250        case FM10K_FUM_FAULT:
1251                switch (fault->type) {
1252                default:
1253                        error = "Unknown FUM error";
1254                        break;
1255                FM10K_ERR_MSG(FUM_NO_FAULT);
1256                FM10K_ERR_MSG(FUM_UNMAPPED_ADDR);
1257                FM10K_ERR_MSG(FUM_BAD_VF_QACCESS);
1258                FM10K_ERR_MSG(FUM_ADD_DECODE_ERR);
1259                FM10K_ERR_MSG(FUM_RO_ERROR);
1260                FM10K_ERR_MSG(FUM_QPRC_CRC_ERROR);
1261                FM10K_ERR_MSG(FUM_CSR_TIMEOUT);
1262                FM10K_ERR_MSG(FUM_INVALID_TYPE);
1263                FM10K_ERR_MSG(FUM_INVALID_LENGTH);
1264                FM10K_ERR_MSG(FUM_INVALID_BE);
1265                FM10K_ERR_MSG(FUM_INVALID_ALIGN);
1266                }
1267                break;
1268        default:
1269                error = "Undocumented fault";
1270                break;
1271        }
1272
1273        dev_warn(&pdev->dev,
1274                 "%s Address: 0x%llx SpecInfo: 0x%x Func: %02x.%0x\n",
1275                 error, fault->address, fault->specinfo,
1276                 PCI_SLOT(fault->func), PCI_FUNC(fault->func));
1277
1278        /* For VF faults, clear out the respective LPORT, reset the queue
1279         * resources, and then reconnect to the mailbox. This allows the
1280         * VF in question to resume behavior. For transient faults that are
1281         * the result of non-malicious behavior this will log the fault and
1282         * allow the VF to resume functionality. Obviously for malicious VFs
1283         * they will be able to attempt malicious behavior again. In this
1284         * case, the system administrator will need to step in and manually
1285         * remove or disable the VF in question.
1286         */
1287        if (fault->func && iov_data) {
1288                int vf = fault->func - 1;
1289                struct fm10k_vf_info *vf_info = &iov_data->vf_info[vf];
1290
1291                hw->iov.ops.reset_lport(hw, vf_info);
1292                hw->iov.ops.reset_resources(hw, vf_info);
1293
1294                /* reset_lport disables the VF, so re-enable it */
1295                hw->iov.ops.set_lport(hw, vf_info, vf,
1296                                      FM10K_VF_FLAG_MULTI_CAPABLE);
1297
1298                /* reset_resources will disconnect from the mbx  */
1299                vf_info->mbx.ops.connect(hw, &vf_info->mbx);
1300        }
1301}
1302
1303static void fm10k_report_fault(struct fm10k_intfc *interface, u32 eicr)
1304{
1305        struct fm10k_hw *hw = &interface->hw;
1306        struct fm10k_fault fault = { 0 };
1307        int type, err;
1308
1309        for (eicr &= FM10K_EICR_FAULT_MASK, type = FM10K_PCA_FAULT;
1310             eicr;
1311             eicr >>= 1, type += FM10K_FAULT_SIZE) {
1312                /* only check if there is an error reported */
1313                if (!(eicr & 0x1))
1314                        continue;
1315
1316                /* retrieve fault info */
1317                err = hw->mac.ops.get_fault(hw, type, &fault);
1318                if (err) {
1319                        dev_err(&interface->pdev->dev,
1320                                "error reading fault\n");
1321                        continue;
1322                }
1323
1324                fm10k_handle_fault(interface, type, &fault);
1325        }
1326}
1327
1328static void fm10k_reset_drop_on_empty(struct fm10k_intfc *interface, u32 eicr)
1329{
1330        struct fm10k_hw *hw = &interface->hw;
1331        const u32 rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
1332        u32 maxholdq;
1333        int q;
1334
1335        if (!(eicr & FM10K_EICR_MAXHOLDTIME))
1336                return;
1337
1338        maxholdq = fm10k_read_reg(hw, FM10K_MAXHOLDQ(7));
1339        if (maxholdq)
1340                fm10k_write_reg(hw, FM10K_MAXHOLDQ(7), maxholdq);
1341        for (q = 255;;) {
1342                if (maxholdq & BIT(31)) {
1343                        if (q < FM10K_MAX_QUEUES_PF) {
1344                                interface->rx_overrun_pf++;
1345                                fm10k_write_reg(hw, FM10K_RXDCTL(q), rxdctl);
1346                        } else {
1347                                interface->rx_overrun_vf++;
1348                        }
1349                }
1350
1351                maxholdq *= 2;
1352                if (!maxholdq)
1353                        q &= ~(32 - 1);
1354
1355                if (!q)
1356                        break;
1357
1358                if (q-- % 32)
1359                        continue;
1360
1361                maxholdq = fm10k_read_reg(hw, FM10K_MAXHOLDQ(q / 32));
1362                if (maxholdq)
1363                        fm10k_write_reg(hw, FM10K_MAXHOLDQ(q / 32), maxholdq);
1364        }
1365}
1366
1367static irqreturn_t fm10k_msix_mbx_pf(int __always_unused irq, void *data)
1368{
1369        struct fm10k_intfc *interface = data;
1370        struct fm10k_hw *hw = &interface->hw;
1371        struct fm10k_mbx_info *mbx = &hw->mbx;
1372        u32 eicr;
1373        s32 err = 0;
1374
1375        /* unmask any set bits related to this interrupt */
1376        eicr = fm10k_read_reg(hw, FM10K_EICR);
1377        fm10k_write_reg(hw, FM10K_EICR, eicr & (FM10K_EICR_MAILBOX |
1378                                                FM10K_EICR_SWITCHREADY |
1379                                                FM10K_EICR_SWITCHNOTREADY));
1380
1381        /* report any faults found to the message log */
1382        fm10k_report_fault(interface, eicr);
1383
1384        /* reset any queues disabled due to receiver overrun */
1385        fm10k_reset_drop_on_empty(interface, eicr);
1386
1387        /* service mailboxes */
1388        if (fm10k_mbx_trylock(interface)) {
1389                err = mbx->ops.process(hw, mbx);
1390                /* handle VFLRE events */
1391                fm10k_iov_event(interface);
1392                fm10k_mbx_unlock(interface);
1393        }
1394
1395        if (err == FM10K_ERR_RESET_REQUESTED)
1396                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1397
1398        /* if switch toggled state we should reset GLORTs */
1399        if (eicr & FM10K_EICR_SWITCHNOTREADY) {
1400                /* force link down for at least 4 seconds */
1401                interface->link_down_event = jiffies + (4 * HZ);
1402                set_bit(__FM10K_LINK_DOWN, interface->state);
1403
1404                /* reset dglort_map back to no config */
1405                hw->mac.dglort_map = FM10K_DGLORTMAP_NONE;
1406        }
1407
1408        /* we should validate host state after interrupt event */
1409        hw->mac.get_host_state = true;
1410
1411        /* validate host state, and handle VF mailboxes in the service task */
1412        fm10k_service_event_schedule(interface);
1413
1414        /* re-enable mailbox interrupt and indicate 20us delay */
1415        fm10k_write_reg(hw, FM10K_ITR(FM10K_MBX_VECTOR),
1416                        (FM10K_MBX_INT_DELAY >> hw->mac.itr_scale) |
1417                        FM10K_ITR_ENABLE);
1418
1419        return IRQ_HANDLED;
1420}
1421
1422void fm10k_mbx_free_irq(struct fm10k_intfc *interface)
1423{
1424        struct fm10k_hw *hw = &interface->hw;
1425        struct msix_entry *entry;
1426        int itr_reg;
1427
1428        /* no mailbox IRQ to free if MSI-X is not enabled */
1429        if (!interface->msix_entries)
1430                return;
1431
1432        entry = &interface->msix_entries[FM10K_MBX_VECTOR];
1433
1434        /* disconnect the mailbox */
1435        hw->mbx.ops.disconnect(hw, &hw->mbx);
1436
1437        /* disable Mailbox cause */
1438        if (hw->mac.type == fm10k_mac_pf) {
1439                fm10k_write_reg(hw, FM10K_EIMR,
1440                                FM10K_EIMR_DISABLE(PCA_FAULT) |
1441                                FM10K_EIMR_DISABLE(FUM_FAULT) |
1442                                FM10K_EIMR_DISABLE(MAILBOX) |
1443                                FM10K_EIMR_DISABLE(SWITCHREADY) |
1444                                FM10K_EIMR_DISABLE(SWITCHNOTREADY) |
1445                                FM10K_EIMR_DISABLE(SRAMERROR) |
1446                                FM10K_EIMR_DISABLE(VFLR) |
1447                                FM10K_EIMR_DISABLE(MAXHOLDTIME));
1448                itr_reg = FM10K_ITR(FM10K_MBX_VECTOR);
1449        } else {
1450                itr_reg = FM10K_VFITR(FM10K_MBX_VECTOR);
1451        }
1452
1453        fm10k_write_reg(hw, itr_reg, FM10K_ITR_MASK_SET);
1454
1455        free_irq(entry->vector, interface);
1456}
1457
1458static s32 fm10k_mbx_mac_addr(struct fm10k_hw *hw, u32 **results,
1459                              struct fm10k_mbx_info *mbx)
1460{
1461        bool vlan_override = hw->mac.vlan_override;
1462        u16 default_vid = hw->mac.default_vid;
1463        struct fm10k_intfc *interface;
1464        s32 err;
1465
1466        err = fm10k_msg_mac_vlan_vf(hw, results, mbx);
1467        if (err)
1468                return err;
1469
1470        interface = container_of(hw, struct fm10k_intfc, hw);
1471
1472        /* MAC was changed so we need reset */
1473        if (is_valid_ether_addr(hw->mac.perm_addr) &&
1474            !ether_addr_equal(hw->mac.perm_addr, hw->mac.addr))
1475                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1476
1477        /* VLAN override was changed, or default VLAN changed */
1478        if ((vlan_override != hw->mac.vlan_override) ||
1479            (default_vid != hw->mac.default_vid))
1480                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1481
1482        return 0;
1483}
1484
1485/* generic error handler for mailbox issues */
1486static s32 fm10k_mbx_error(struct fm10k_hw *hw, u32 **results,
1487                           struct fm10k_mbx_info __always_unused *mbx)
1488{
1489        struct fm10k_intfc *interface;
1490        struct pci_dev *pdev;
1491
1492        interface = container_of(hw, struct fm10k_intfc, hw);
1493        pdev = interface->pdev;
1494
1495        dev_err(&pdev->dev, "Unknown message ID %u\n",
1496                **results & FM10K_TLV_ID_MASK);
1497
1498        return 0;
1499}
1500
1501static const struct fm10k_msg_data vf_mbx_data[] = {
1502        FM10K_TLV_MSG_TEST_HANDLER(fm10k_tlv_msg_test),
1503        FM10K_VF_MSG_MAC_VLAN_HANDLER(fm10k_mbx_mac_addr),
1504        FM10K_VF_MSG_LPORT_STATE_HANDLER(fm10k_msg_lport_state_vf),
1505        FM10K_TLV_MSG_ERROR_HANDLER(fm10k_mbx_error),
1506};
1507
1508static int fm10k_mbx_request_irq_vf(struct fm10k_intfc *interface)
1509{
1510        struct msix_entry *entry = &interface->msix_entries[FM10K_MBX_VECTOR];
1511        struct net_device *dev = interface->netdev;
1512        struct fm10k_hw *hw = &interface->hw;
1513        int err;
1514
1515        /* Use timer0 for interrupt moderation on the mailbox */
1516        u32 itr = entry->entry | FM10K_INT_MAP_TIMER0;
1517
1518        /* register mailbox handlers */
1519        err = hw->mbx.ops.register_handlers(&hw->mbx, vf_mbx_data);
1520        if (err)
1521                return err;
1522
1523        /* request the IRQ */
1524        err = request_irq(entry->vector, fm10k_msix_mbx_vf, 0,
1525                          dev->name, interface);
1526        if (err) {
1527                netif_err(interface, probe, dev,
1528                          "request_irq for msix_mbx failed: %d\n", err);
1529                return err;
1530        }
1531
1532        /* map all of the interrupt sources */
1533        fm10k_write_reg(hw, FM10K_VFINT_MAP, itr);
1534
1535        /* enable interrupt */
1536        fm10k_write_reg(hw, FM10K_VFITR(entry->entry), FM10K_ITR_ENABLE);
1537
1538        return 0;
1539}
1540
1541static s32 fm10k_lport_map(struct fm10k_hw *hw, u32 **results,
1542                           struct fm10k_mbx_info *mbx)
1543{
1544        struct fm10k_intfc *interface;
1545        u32 dglort_map = hw->mac.dglort_map;
1546        s32 err;
1547
1548        interface = container_of(hw, struct fm10k_intfc, hw);
1549
1550        err = fm10k_msg_err_pf(hw, results, mbx);
1551        if (!err && hw->swapi.status) {
1552                /* force link down for a reasonable delay */
1553                interface->link_down_event = jiffies + (2 * HZ);
1554                set_bit(__FM10K_LINK_DOWN, interface->state);
1555
1556                /* reset dglort_map back to no config */
1557                hw->mac.dglort_map = FM10K_DGLORTMAP_NONE;
1558
1559                fm10k_service_event_schedule(interface);
1560
1561                /* prevent overloading kernel message buffer */
1562                if (interface->lport_map_failed)
1563                        return 0;
1564
1565                interface->lport_map_failed = true;
1566
1567                if (hw->swapi.status == FM10K_MSG_ERR_PEP_NOT_SCHEDULED)
1568                        dev_warn(&interface->pdev->dev,
1569                                 "cannot obtain link because the host interface is configured for a PCIe host interface bandwidth of zero\n");
1570                dev_warn(&interface->pdev->dev,
1571                         "request logical port map failed: %d\n",
1572                         hw->swapi.status);
1573
1574                return 0;
1575        }
1576
1577        err = fm10k_msg_lport_map_pf(hw, results, mbx);
1578        if (err)
1579                return err;
1580
1581        interface->lport_map_failed = false;
1582
1583        /* we need to reset if port count was just updated */
1584        if (dglort_map != hw->mac.dglort_map)
1585                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1586
1587        return 0;
1588}
1589
1590static s32 fm10k_update_pvid(struct fm10k_hw *hw, u32 **results,
1591                             struct fm10k_mbx_info __always_unused *mbx)
1592{
1593        struct fm10k_intfc *interface;
1594        u16 glort, pvid;
1595        u32 pvid_update;
1596        s32 err;
1597
1598        err = fm10k_tlv_attr_get_u32(results[FM10K_PF_ATTR_ID_UPDATE_PVID],
1599                                     &pvid_update);
1600        if (err)
1601                return err;
1602
1603        /* extract values from the pvid update */
1604        glort = FM10K_MSG_HDR_FIELD_GET(pvid_update, UPDATE_PVID_GLORT);
1605        pvid = FM10K_MSG_HDR_FIELD_GET(pvid_update, UPDATE_PVID_PVID);
1606
1607        /* if glort is not valid return error */
1608        if (!fm10k_glort_valid_pf(hw, glort))
1609                return FM10K_ERR_PARAM;
1610
1611        /* verify VLAN ID is valid */
1612        if (pvid >= FM10K_VLAN_TABLE_VID_MAX)
1613                return FM10K_ERR_PARAM;
1614
1615        interface = container_of(hw, struct fm10k_intfc, hw);
1616
1617        /* check to see if this belongs to one of the VFs */
1618        err = fm10k_iov_update_pvid(interface, glort, pvid);
1619        if (!err)
1620                return 0;
1621
1622        /* we need to reset if default VLAN was just updated */
1623        if (pvid != hw->mac.default_vid)
1624                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
1625
1626        hw->mac.default_vid = pvid;
1627
1628        return 0;
1629}
1630
1631static const struct fm10k_msg_data pf_mbx_data[] = {
1632        FM10K_PF_MSG_ERR_HANDLER(XCAST_MODES, fm10k_msg_err_pf),
1633        FM10K_PF_MSG_ERR_HANDLER(UPDATE_MAC_FWD_RULE, fm10k_msg_err_pf),
1634        FM10K_PF_MSG_LPORT_MAP_HANDLER(fm10k_lport_map),
1635        FM10K_PF_MSG_ERR_HANDLER(LPORT_CREATE, fm10k_msg_err_pf),
1636        FM10K_PF_MSG_ERR_HANDLER(LPORT_DELETE, fm10k_msg_err_pf),
1637        FM10K_PF_MSG_UPDATE_PVID_HANDLER(fm10k_update_pvid),
1638        FM10K_TLV_MSG_ERROR_HANDLER(fm10k_mbx_error),
1639};
1640
1641static int fm10k_mbx_request_irq_pf(struct fm10k_intfc *interface)
1642{
1643        struct msix_entry *entry = &interface->msix_entries[FM10K_MBX_VECTOR];
1644        struct net_device *dev = interface->netdev;
1645        struct fm10k_hw *hw = &interface->hw;
1646        int err;
1647
1648        /* Use timer0 for interrupt moderation on the mailbox */
1649        u32 mbx_itr = entry->entry | FM10K_INT_MAP_TIMER0;
1650        u32 other_itr = entry->entry | FM10K_INT_MAP_IMMEDIATE;
1651
1652        /* register mailbox handlers */
1653        err = hw->mbx.ops.register_handlers(&hw->mbx, pf_mbx_data);
1654        if (err)
1655                return err;
1656
1657        /* request the IRQ */
1658        err = request_irq(entry->vector, fm10k_msix_mbx_pf, 0,
1659                          dev->name, interface);
1660        if (err) {
1661                netif_err(interface, probe, dev,
1662                          "request_irq for msix_mbx failed: %d\n", err);
1663                return err;
1664        }
1665
1666        /* Enable interrupts w/ no moderation for "other" interrupts */
1667        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_pcie_fault), other_itr);
1668        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_switch_up_down), other_itr);
1669        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_sram), other_itr);
1670        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_max_hold_time), other_itr);
1671        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_vflr), other_itr);
1672
1673        /* Enable interrupts w/ moderation for mailbox */
1674        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_mailbox), mbx_itr);
1675
1676        /* Enable individual interrupt causes */
1677        fm10k_write_reg(hw, FM10K_EIMR, FM10K_EIMR_ENABLE(PCA_FAULT) |
1678                                        FM10K_EIMR_ENABLE(FUM_FAULT) |
1679                                        FM10K_EIMR_ENABLE(MAILBOX) |
1680                                        FM10K_EIMR_ENABLE(SWITCHREADY) |
1681                                        FM10K_EIMR_ENABLE(SWITCHNOTREADY) |
1682                                        FM10K_EIMR_ENABLE(SRAMERROR) |
1683                                        FM10K_EIMR_ENABLE(VFLR) |
1684                                        FM10K_EIMR_ENABLE(MAXHOLDTIME));
1685
1686        /* enable interrupt */
1687        fm10k_write_reg(hw, FM10K_ITR(entry->entry), FM10K_ITR_ENABLE);
1688
1689        return 0;
1690}
1691
1692int fm10k_mbx_request_irq(struct fm10k_intfc *interface)
1693{
1694        struct fm10k_hw *hw = &interface->hw;
1695        int err;
1696
1697        /* enable Mailbox cause */
1698        if (hw->mac.type == fm10k_mac_pf)
1699                err = fm10k_mbx_request_irq_pf(interface);
1700        else
1701                err = fm10k_mbx_request_irq_vf(interface);
1702        if (err)
1703                return err;
1704
1705        /* connect mailbox */
1706        err = hw->mbx.ops.connect(hw, &hw->mbx);
1707
1708        /* if the mailbox failed to connect, then free IRQ */
1709        if (err)
1710                fm10k_mbx_free_irq(interface);
1711
1712        return err;
1713}
1714
1715/**
1716 * fm10k_qv_free_irq - release interrupts associated with queue vectors
1717 * @interface: board private structure
1718 *
1719 * Release all interrupts associated with this interface
1720 **/
1721void fm10k_qv_free_irq(struct fm10k_intfc *interface)
1722{
1723        int vector = interface->num_q_vectors;
1724        struct msix_entry *entry;
1725
1726        entry = &interface->msix_entries[NON_Q_VECTORS + vector];
1727
1728        while (vector) {
1729                struct fm10k_q_vector *q_vector;
1730
1731                vector--;
1732                entry--;
1733                q_vector = interface->q_vector[vector];
1734
1735                if (!q_vector->tx.count && !q_vector->rx.count)
1736                        continue;
1737
1738                /* clear the affinity_mask in the IRQ descriptor */
1739                irq_set_affinity_hint(entry->vector, NULL);
1740
1741                /* disable interrupts */
1742                writel(FM10K_ITR_MASK_SET, q_vector->itr);
1743
1744                free_irq(entry->vector, q_vector);
1745        }
1746}
1747
1748/**
1749 * fm10k_qv_request_irq - initialize interrupts for queue vectors
1750 * @interface: board private structure
1751 *
1752 * Attempts to configure interrupts using the best available
1753 * capabilities of the hardware and kernel.
1754 **/
1755int fm10k_qv_request_irq(struct fm10k_intfc *interface)
1756{
1757        struct net_device *dev = interface->netdev;
1758        struct fm10k_hw *hw = &interface->hw;
1759        struct msix_entry *entry;
1760        unsigned int ri = 0, ti = 0;
1761        int vector, err;
1762
1763        entry = &interface->msix_entries[NON_Q_VECTORS];
1764
1765        for (vector = 0; vector < interface->num_q_vectors; vector++) {
1766                struct fm10k_q_vector *q_vector = interface->q_vector[vector];
1767
1768                /* name the vector */
1769                if (q_vector->tx.count && q_vector->rx.count) {
1770                        snprintf(q_vector->name, sizeof(q_vector->name),
1771                                 "%s-TxRx-%u", dev->name, ri++);
1772                        ti++;
1773                } else if (q_vector->rx.count) {
1774                        snprintf(q_vector->name, sizeof(q_vector->name),
1775                                 "%s-rx-%u", dev->name, ri++);
1776                } else if (q_vector->tx.count) {
1777                        snprintf(q_vector->name, sizeof(q_vector->name),
1778                                 "%s-tx-%u", dev->name, ti++);
1779                } else {
1780                        /* skip this unused q_vector */
1781                        continue;
1782                }
1783
1784                /* Assign ITR register to q_vector */
1785                q_vector->itr = (hw->mac.type == fm10k_mac_pf) ?
1786                                &interface->uc_addr[FM10K_ITR(entry->entry)] :
1787                                &interface->uc_addr[FM10K_VFITR(entry->entry)];
1788
1789                /* request the IRQ */
1790                err = request_irq(entry->vector, &fm10k_msix_clean_rings, 0,
1791                                  q_vector->name, q_vector);
1792                if (err) {
1793                        netif_err(interface, probe, dev,
1794                                  "request_irq failed for MSIX interrupt Error: %d\n",
1795                                  err);
1796                        goto err_out;
1797                }
1798
1799                /* assign the mask for this irq */
1800                irq_set_affinity_hint(entry->vector, &q_vector->affinity_mask);
1801
1802                /* Enable q_vector */
1803                writel(FM10K_ITR_ENABLE, q_vector->itr);
1804
1805                entry++;
1806        }
1807
1808        return 0;
1809
1810err_out:
1811        /* wind through the ring freeing all entries and vectors */
1812        while (vector) {
1813                struct fm10k_q_vector *q_vector;
1814
1815                entry--;
1816                vector--;
1817                q_vector = interface->q_vector[vector];
1818
1819                if (!q_vector->tx.count && !q_vector->rx.count)
1820                        continue;
1821
1822                /* clear the affinity_mask in the IRQ descriptor */
1823                irq_set_affinity_hint(entry->vector, NULL);
1824
1825                /* disable interrupts */
1826                writel(FM10K_ITR_MASK_SET, q_vector->itr);
1827
1828                free_irq(entry->vector, q_vector);
1829        }
1830
1831        return err;
1832}
1833
1834void fm10k_up(struct fm10k_intfc *interface)
1835{
1836        struct fm10k_hw *hw = &interface->hw;
1837
1838        /* Enable Tx/Rx DMA */
1839        hw->mac.ops.start_hw(hw);
1840
1841        /* configure Tx descriptor rings */
1842        fm10k_configure_tx(interface);
1843
1844        /* configure Rx descriptor rings */
1845        fm10k_configure_rx(interface);
1846
1847        /* configure interrupts */
1848        hw->mac.ops.update_int_moderator(hw);
1849
1850        /* enable statistics capture again */
1851        clear_bit(__FM10K_UPDATING_STATS, interface->state);
1852
1853        /* clear down bit to indicate we are ready to go */
1854        clear_bit(__FM10K_DOWN, interface->state);
1855
1856        /* enable polling cleanups */
1857        fm10k_napi_enable_all(interface);
1858
1859        /* re-establish Rx filters */
1860        fm10k_restore_rx_state(interface);
1861
1862        /* enable transmits */
1863        netif_tx_start_all_queues(interface->netdev);
1864
1865        /* kick off the service timer now */
1866        hw->mac.get_host_state = true;
1867        mod_timer(&interface->service_timer, jiffies);
1868}
1869
1870static void fm10k_napi_disable_all(struct fm10k_intfc *interface)
1871{
1872        struct fm10k_q_vector *q_vector;
1873        int q_idx;
1874
1875        for (q_idx = 0; q_idx < interface->num_q_vectors; q_idx++) {
1876                q_vector = interface->q_vector[q_idx];
1877                napi_disable(&q_vector->napi);
1878        }
1879}
1880
1881void fm10k_down(struct fm10k_intfc *interface)
1882{
1883        struct net_device *netdev = interface->netdev;
1884        struct fm10k_hw *hw = &interface->hw;
1885        int err, i = 0, count = 0;
1886
1887        /* signal that we are down to the interrupt handler and service task */
1888        if (test_and_set_bit(__FM10K_DOWN, interface->state))
1889                return;
1890
1891        /* call carrier off first to avoid false dev_watchdog timeouts */
1892        netif_carrier_off(netdev);
1893
1894        /* disable transmits */
1895        netif_tx_stop_all_queues(netdev);
1896        netif_tx_disable(netdev);
1897
1898        /* reset Rx filters */
1899        fm10k_reset_rx_state(interface);
1900
1901        /* disable polling routines */
1902        fm10k_napi_disable_all(interface);
1903
1904        /* capture stats one last time before stopping interface */
1905        fm10k_update_stats(interface);
1906
1907        /* prevent updating statistics while we're down */
1908        while (test_and_set_bit(__FM10K_UPDATING_STATS, interface->state))
1909                usleep_range(1000, 2000);
1910
1911        /* skip waiting for TX DMA if we lost PCIe link */
1912        if (FM10K_REMOVED(hw->hw_addr))
1913                goto skip_tx_dma_drain;
1914
1915        /* In some rare circumstances it can take a while for Tx queues to
1916         * quiesce and be fully disabled. Attempt to .stop_hw() first, and
1917         * then if we get ERR_REQUESTS_PENDING, go ahead and wait in a loop
1918         * until the Tx queues have emptied, or until a number of retries. If
1919         * we fail to clear within the retry loop, we will issue a warning
1920         * indicating that Tx DMA is probably hung. Note this means we call
1921         * .stop_hw() twice but this shouldn't cause any problems.
1922         */
1923        err = hw->mac.ops.stop_hw(hw);
1924        if (err != FM10K_ERR_REQUESTS_PENDING)
1925                goto skip_tx_dma_drain;
1926
1927#define TX_DMA_DRAIN_RETRIES 25
1928        for (count = 0; count < TX_DMA_DRAIN_RETRIES; count++) {
1929                usleep_range(10000, 20000);
1930
1931                /* start checking at the last ring to have pending Tx */
1932                for (; i < interface->num_tx_queues; i++)
1933                        if (fm10k_get_tx_pending(interface->tx_ring[i], false))
1934                                break;
1935
1936                /* if all the queues are drained, we can break now */
1937                if (i == interface->num_tx_queues)
1938                        break;
1939        }
1940
1941        if (count >= TX_DMA_DRAIN_RETRIES)
1942                dev_err(&interface->pdev->dev,
1943                        "Tx queues failed to drain after %d tries. Tx DMA is probably hung.\n",
1944                        count);
1945skip_tx_dma_drain:
1946        /* Disable DMA engine for Tx/Rx */
1947        err = hw->mac.ops.stop_hw(hw);
1948        if (err == FM10K_ERR_REQUESTS_PENDING)
1949                dev_err(&interface->pdev->dev,
1950                        "due to pending requests hw was not shut down gracefully\n");
1951        else if (err)
1952                dev_err(&interface->pdev->dev, "stop_hw failed: %d\n", err);
1953
1954        /* free any buffers still on the rings */
1955        fm10k_clean_all_tx_rings(interface);
1956        fm10k_clean_all_rx_rings(interface);
1957}
1958
1959/**
1960 * fm10k_sw_init - Initialize general software structures
1961 * @interface: host interface private structure to initialize
1962 * @ent: PCI device ID entry
1963 *
1964 * fm10k_sw_init initializes the interface private data structure.
1965 * Fields are initialized based on PCI device information and
1966 * OS network device settings (MTU size).
1967 **/
1968static int fm10k_sw_init(struct fm10k_intfc *interface,
1969                         const struct pci_device_id *ent)
1970{
1971        const struct fm10k_info *fi = fm10k_info_tbl[ent->driver_data];
1972        struct fm10k_hw *hw = &interface->hw;
1973        struct pci_dev *pdev = interface->pdev;
1974        struct net_device *netdev = interface->netdev;
1975        u32 rss_key[FM10K_RSSRK_SIZE];
1976        unsigned int rss;
1977        int err;
1978
1979        /* initialize back pointer */
1980        hw->back = interface;
1981        hw->hw_addr = interface->uc_addr;
1982
1983        /* PCI config space info */
1984        hw->vendor_id = pdev->vendor;
1985        hw->device_id = pdev->device;
1986        hw->revision_id = pdev->revision;
1987        hw->subsystem_vendor_id = pdev->subsystem_vendor;
1988        hw->subsystem_device_id = pdev->subsystem_device;
1989
1990        /* Setup hw api */
1991        memcpy(&hw->mac.ops, fi->mac_ops, sizeof(hw->mac.ops));
1992        hw->mac.type = fi->mac;
1993
1994        /* Setup IOV handlers */
1995        if (fi->iov_ops)
1996                memcpy(&hw->iov.ops, fi->iov_ops, sizeof(hw->iov.ops));
1997
1998        /* Set common capability flags and settings */
1999        rss = min_t(int, FM10K_MAX_RSS_INDICES, num_online_cpus());
2000        interface->ring_feature[RING_F_RSS].limit = rss;
2001        fi->get_invariants(hw);
2002
2003        /* pick up the PCIe bus settings for reporting later */
2004        if (hw->mac.ops.get_bus_info)
2005                hw->mac.ops.get_bus_info(hw);
2006
2007        /* limit the usable DMA range */
2008        if (hw->mac.ops.set_dma_mask)
2009                hw->mac.ops.set_dma_mask(hw, dma_get_mask(&pdev->dev));
2010
2011        /* update netdev with DMA restrictions */
2012        if (dma_get_mask(&pdev->dev) > DMA_BIT_MASK(32)) {
2013                netdev->features |= NETIF_F_HIGHDMA;
2014                netdev->vlan_features |= NETIF_F_HIGHDMA;
2015        }
2016
2017        /* reset and initialize the hardware so it is in a known state */
2018        err = hw->mac.ops.reset_hw(hw);
2019        if (err) {
2020                dev_err(&pdev->dev, "reset_hw failed: %d\n", err);
2021                return err;
2022        }
2023
2024        err = hw->mac.ops.init_hw(hw);
2025        if (err) {
2026                dev_err(&pdev->dev, "init_hw failed: %d\n", err);
2027                return err;
2028        }
2029
2030        /* initialize hardware statistics */
2031        hw->mac.ops.update_hw_stats(hw, &interface->stats);
2032
2033        /* Set upper limit on IOV VFs that can be allocated */
2034        pci_sriov_set_totalvfs(pdev, hw->iov.total_vfs);
2035
2036        /* Start with random Ethernet address */
2037        eth_random_addr(hw->mac.addr);
2038
2039        /* Initialize MAC address from hardware */
2040        err = hw->mac.ops.read_mac_addr(hw);
2041        if (err) {
2042                dev_warn(&pdev->dev,
2043                         "Failed to obtain MAC address defaulting to random\n");
2044                /* tag address assignment as random */
2045                netdev->addr_assign_type |= NET_ADDR_RANDOM;
2046        }
2047
2048        ether_addr_copy(netdev->dev_addr, hw->mac.addr);
2049        ether_addr_copy(netdev->perm_addr, hw->mac.addr);
2050
2051        if (!is_valid_ether_addr(netdev->perm_addr)) {
2052                dev_err(&pdev->dev, "Invalid MAC Address\n");
2053                return -EIO;
2054        }
2055
2056        /* initialize DCBNL interface */
2057        fm10k_dcbnl_set_ops(netdev);
2058
2059        /* set default ring sizes */
2060        interface->tx_ring_count = FM10K_DEFAULT_TXD;
2061        interface->rx_ring_count = FM10K_DEFAULT_RXD;
2062
2063        /* set default interrupt moderation */
2064        interface->tx_itr = FM10K_TX_ITR_DEFAULT;
2065        interface->rx_itr = FM10K_ITR_ADAPTIVE | FM10K_RX_ITR_DEFAULT;
2066
2067        /* Initialize the MAC/VLAN queue */
2068        INIT_LIST_HEAD(&interface->macvlan_requests);
2069
2070        netdev_rss_key_fill(rss_key, sizeof(rss_key));
2071        memcpy(interface->rssrk, rss_key, sizeof(rss_key));
2072
2073        /* Initialize the mailbox lock */
2074        spin_lock_init(&interface->mbx_lock);
2075        spin_lock_init(&interface->macvlan_lock);
2076
2077        /* Start off interface as being down */
2078        set_bit(__FM10K_DOWN, interface->state);
2079        set_bit(__FM10K_UPDATING_STATS, interface->state);
2080
2081        return 0;
2082}
2083
2084/**
2085 * fm10k_probe - Device Initialization Routine
2086 * @pdev: PCI device information struct
2087 * @ent: entry in fm10k_pci_tbl
2088 *
2089 * Returns 0 on success, negative on failure
2090 *
2091 * fm10k_probe initializes an interface identified by a pci_dev structure.
2092 * The OS initialization, configuring of the interface private structure,
2093 * and a hardware reset occur.
2094 **/
2095static int fm10k_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2096{
2097        struct net_device *netdev;
2098        struct fm10k_intfc *interface;
2099        int err;
2100
2101        if (pdev->error_state != pci_channel_io_normal) {
2102                dev_err(&pdev->dev,
2103                        "PCI device still in an error state. Unable to load...\n");
2104                return -EIO;
2105        }
2106
2107        err = pci_enable_device_mem(pdev);
2108        if (err) {
2109                dev_err(&pdev->dev,
2110                        "PCI enable device failed: %d\n", err);
2111                return err;
2112        }
2113
2114        err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
2115        if (err)
2116                err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
2117        if (err) {
2118                dev_err(&pdev->dev,
2119                        "DMA configuration failed: %d\n", err);
2120                goto err_dma;
2121        }
2122
2123        err = pci_request_mem_regions(pdev, fm10k_driver_name);
2124        if (err) {
2125                dev_err(&pdev->dev,
2126                        "pci_request_selected_regions failed: %d\n", err);
2127                goto err_pci_reg;
2128        }
2129
2130        pci_enable_pcie_error_reporting(pdev);
2131
2132        pci_set_master(pdev);
2133        pci_save_state(pdev);
2134
2135        netdev = fm10k_alloc_netdev(fm10k_info_tbl[ent->driver_data]);
2136        if (!netdev) {
2137                err = -ENOMEM;
2138                goto err_alloc_netdev;
2139        }
2140
2141        SET_NETDEV_DEV(netdev, &pdev->dev);
2142
2143        interface = netdev_priv(netdev);
2144        pci_set_drvdata(pdev, interface);
2145
2146        interface->netdev = netdev;
2147        interface->pdev = pdev;
2148
2149        interface->uc_addr = ioremap(pci_resource_start(pdev, 0),
2150                                     FM10K_UC_ADDR_SIZE);
2151        if (!interface->uc_addr) {
2152                err = -EIO;
2153                goto err_ioremap;
2154        }
2155
2156        err = fm10k_sw_init(interface, ent);
2157        if (err)
2158                goto err_sw_init;
2159
2160        /* enable debugfs support */
2161        fm10k_dbg_intfc_init(interface);
2162
2163        err = fm10k_init_queueing_scheme(interface);
2164        if (err)
2165                goto err_sw_init;
2166
2167        /* the mbx interrupt might attempt to schedule the service task, so we
2168         * must ensure it is disabled since we haven't yet requested the timer
2169         * or work item.
2170         */
2171        set_bit(__FM10K_SERVICE_DISABLE, interface->state);
2172
2173        err = fm10k_mbx_request_irq(interface);
2174        if (err)
2175                goto err_mbx_interrupt;
2176
2177        /* final check of hardware state before registering the interface */
2178        err = fm10k_hw_ready(interface);
2179        if (err)
2180                goto err_register;
2181
2182        err = register_netdev(netdev);
2183        if (err)
2184                goto err_register;
2185
2186        /* carrier off reporting is important to ethtool even BEFORE open */
2187        netif_carrier_off(netdev);
2188
2189        /* stop all the transmit queues from transmitting until link is up */
2190        netif_tx_stop_all_queues(netdev);
2191
2192        /* Initialize service timer and service task late in order to avoid
2193         * cleanup issues.
2194         */
2195        timer_setup(&interface->service_timer, fm10k_service_timer, 0);
2196        INIT_WORK(&interface->service_task, fm10k_service_task);
2197
2198        /* Setup the MAC/VLAN queue */
2199        INIT_DELAYED_WORK(&interface->macvlan_task, fm10k_macvlan_task);
2200
2201        /* kick off service timer now, even when interface is down */
2202        mod_timer(&interface->service_timer, (HZ * 2) + jiffies);
2203
2204        /* print warning for non-optimal configurations */
2205        pcie_print_link_status(interface->pdev);
2206
2207        /* report MAC address for logging */
2208        dev_info(&pdev->dev, "%pM\n", netdev->dev_addr);
2209
2210        /* enable SR-IOV after registering netdev to enforce PF/VF ordering */
2211        fm10k_iov_configure(pdev, 0);
2212
2213        /* clear the service task disable bit and kick off service task */
2214        clear_bit(__FM10K_SERVICE_DISABLE, interface->state);
2215        fm10k_service_event_schedule(interface);
2216
2217        return 0;
2218
2219err_register:
2220        fm10k_mbx_free_irq(interface);
2221err_mbx_interrupt:
2222        fm10k_clear_queueing_scheme(interface);
2223err_sw_init:
2224        if (interface->sw_addr)
2225                iounmap(interface->sw_addr);
2226        iounmap(interface->uc_addr);
2227err_ioremap:
2228        free_netdev(netdev);
2229err_alloc_netdev:
2230        pci_disable_pcie_error_reporting(pdev);
2231        pci_release_mem_regions(pdev);
2232err_pci_reg:
2233err_dma:
2234        pci_disable_device(pdev);
2235        return err;
2236}
2237
2238/**
2239 * fm10k_remove - Device Removal Routine
2240 * @pdev: PCI device information struct
2241 *
2242 * fm10k_remove is called by the PCI subsystem to alert the driver
2243 * that it should release a PCI device.  The could be caused by a
2244 * Hot-Plug event, or because the driver is going to be removed from
2245 * memory.
2246 **/
2247static void fm10k_remove(struct pci_dev *pdev)
2248{
2249        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
2250        struct net_device *netdev = interface->netdev;
2251
2252        del_timer_sync(&interface->service_timer);
2253
2254        fm10k_stop_service_event(interface);
2255        fm10k_stop_macvlan_task(interface);
2256
2257        /* Remove all pending MAC/VLAN requests */
2258        fm10k_clear_macvlan_queue(interface, interface->glort, true);
2259
2260        /* free netdev, this may bounce the interrupts due to setup_tc */
2261        if (netdev->reg_state == NETREG_REGISTERED)
2262                unregister_netdev(netdev);
2263
2264        /* release VFs */
2265        fm10k_iov_disable(pdev);
2266
2267        /* disable mailbox interrupt */
2268        fm10k_mbx_free_irq(interface);
2269
2270        /* free interrupts */
2271        fm10k_clear_queueing_scheme(interface);
2272
2273        /* remove any debugfs interfaces */
2274        fm10k_dbg_intfc_exit(interface);
2275
2276        if (interface->sw_addr)
2277                iounmap(interface->sw_addr);
2278        iounmap(interface->uc_addr);
2279
2280        free_netdev(netdev);
2281
2282        pci_release_mem_regions(pdev);
2283
2284        pci_disable_pcie_error_reporting(pdev);
2285
2286        pci_disable_device(pdev);
2287}
2288
2289static void fm10k_prepare_suspend(struct fm10k_intfc *interface)
2290{
2291        /* the watchdog task reads from registers, which might appear like
2292         * a surprise remove if the PCIe device is disabled while we're
2293         * stopped. We stop the watchdog task until after we resume software
2294         * activity.
2295         *
2296         * Note that the MAC/VLAN task will be stopped as part of preparing
2297         * for reset so we don't need to handle it here.
2298         */
2299        fm10k_stop_service_event(interface);
2300
2301        if (fm10k_prepare_for_reset(interface))
2302                set_bit(__FM10K_RESET_SUSPENDED, interface->state);
2303}
2304
2305static int fm10k_handle_resume(struct fm10k_intfc *interface)
2306{
2307        struct fm10k_hw *hw = &interface->hw;
2308        int err;
2309
2310        /* Even if we didn't properly prepare for reset in
2311         * fm10k_prepare_suspend, we'll attempt to resume anyways.
2312         */
2313        if (!test_and_clear_bit(__FM10K_RESET_SUSPENDED, interface->state))
2314                dev_warn(&interface->pdev->dev,
2315                         "Device was shut down as part of suspend... Attempting to recover\n");
2316
2317        /* reset statistics starting values */
2318        hw->mac.ops.rebind_hw_stats(hw, &interface->stats);
2319
2320        err = fm10k_handle_reset(interface);
2321        if (err)
2322                return err;
2323
2324        /* assume host is not ready, to prevent race with watchdog in case we
2325         * actually don't have connection to the switch
2326         */
2327        interface->host_ready = false;
2328        fm10k_watchdog_host_not_ready(interface);
2329
2330        /* force link to stay down for a second to prevent link flutter */
2331        interface->link_down_event = jiffies + (HZ);
2332        set_bit(__FM10K_LINK_DOWN, interface->state);
2333
2334        /* restart the service task */
2335        fm10k_start_service_event(interface);
2336
2337        /* Restart the MAC/VLAN request queue in-case of outstanding events */
2338        fm10k_macvlan_schedule(interface);
2339
2340        return 0;
2341}
2342
2343/**
2344 * fm10k_resume - Generic PM resume hook
2345 * @dev: generic device structure
2346 *
2347 * Generic PM hook used when waking the device from a low power state after
2348 * suspend or hibernation. This function does not need to handle lower PCIe
2349 * device state as the stack takes care of that for us.
2350 **/
2351static int __maybe_unused fm10k_resume(struct device *dev)
2352{
2353        struct fm10k_intfc *interface = dev_get_drvdata(dev);
2354        struct net_device *netdev = interface->netdev;
2355        struct fm10k_hw *hw = &interface->hw;
2356        int err;
2357
2358        /* refresh hw_addr in case it was dropped */
2359        hw->hw_addr = interface->uc_addr;
2360
2361        err = fm10k_handle_resume(interface);
2362        if (err)
2363                return err;
2364
2365        netif_device_attach(netdev);
2366
2367        return 0;
2368}
2369
2370/**
2371 * fm10k_suspend - Generic PM suspend hook
2372 * @dev: generic device structure
2373 *
2374 * Generic PM hook used when setting the device into a low power state for
2375 * system suspend or hibernation. This function does not need to handle lower
2376 * PCIe device state as the stack takes care of that for us.
2377 **/
2378static int __maybe_unused fm10k_suspend(struct device *dev)
2379{
2380        struct fm10k_intfc *interface = dev_get_drvdata(dev);
2381        struct net_device *netdev = interface->netdev;
2382
2383        netif_device_detach(netdev);
2384
2385        fm10k_prepare_suspend(interface);
2386
2387        return 0;
2388}
2389
2390/**
2391 * fm10k_io_error_detected - called when PCI error is detected
2392 * @pdev: Pointer to PCI device
2393 * @state: The current pci connection state
2394 *
2395 * This function is called after a PCI bus error affecting
2396 * this device has been detected.
2397 */
2398static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev,
2399                                                pci_channel_state_t state)
2400{
2401        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
2402        struct net_device *netdev = interface->netdev;
2403
2404        netif_device_detach(netdev);
2405
2406        if (state == pci_channel_io_perm_failure)
2407                return PCI_ERS_RESULT_DISCONNECT;
2408
2409        fm10k_prepare_suspend(interface);
2410
2411        /* Request a slot reset. */
2412        return PCI_ERS_RESULT_NEED_RESET;
2413}
2414
2415/**
2416 * fm10k_io_slot_reset - called after the pci bus has been reset.
2417 * @pdev: Pointer to PCI device
2418 *
2419 * Restart the card from scratch, as if from a cold-boot.
2420 */
2421static pci_ers_result_t fm10k_io_slot_reset(struct pci_dev *pdev)
2422{
2423        pci_ers_result_t result;
2424
2425        if (pci_reenable_device(pdev)) {
2426                dev_err(&pdev->dev,
2427                        "Cannot re-enable PCI device after reset.\n");
2428                result = PCI_ERS_RESULT_DISCONNECT;
2429        } else {
2430                pci_set_master(pdev);
2431                pci_restore_state(pdev);
2432
2433                /* After second error pci->state_saved is false, this
2434                 * resets it so EEH doesn't break.
2435                 */
2436                pci_save_state(pdev);
2437
2438                pci_wake_from_d3(pdev, false);
2439
2440                result = PCI_ERS_RESULT_RECOVERED;
2441        }
2442
2443        return result;
2444}
2445
2446/**
2447 * fm10k_io_resume - called when traffic can start flowing again.
2448 * @pdev: Pointer to PCI device
2449 *
2450 * This callback is called when the error recovery driver tells us that
2451 * its OK to resume normal operation.
2452 */
2453static void fm10k_io_resume(struct pci_dev *pdev)
2454{
2455        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
2456        struct net_device *netdev = interface->netdev;
2457        int err;
2458
2459        err = fm10k_handle_resume(interface);
2460
2461        if (err)
2462                dev_warn(&pdev->dev,
2463                         "%s failed: %d\n", __func__, err);
2464        else
2465                netif_device_attach(netdev);
2466}
2467
2468/**
2469 * fm10k_io_reset_prepare - called when PCI function is about to be reset
2470 * @pdev: Pointer to PCI device
2471 *
2472 * This callback is called when the PCI function is about to be reset,
2473 * allowing the device driver to prepare for it.
2474 */
2475static void fm10k_io_reset_prepare(struct pci_dev *pdev)
2476{
2477        /* warn incase we have any active VF devices */
2478        if (pci_num_vf(pdev))
2479                dev_warn(&pdev->dev,
2480                         "PCIe FLR may cause issues for any active VF devices\n");
2481        fm10k_prepare_suspend(pci_get_drvdata(pdev));
2482}
2483
2484/**
2485 * fm10k_io_reset_done - called when PCI function has finished resetting
2486 * @pdev: Pointer to PCI device
2487 *
2488 * This callback is called just after the PCI function is reset, such as via
2489 * /sys/class/net/<enpX>/device/reset or similar.
2490 */
2491static void fm10k_io_reset_done(struct pci_dev *pdev)
2492{
2493        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
2494        int err = fm10k_handle_resume(interface);
2495
2496        if (err) {
2497                dev_warn(&pdev->dev,
2498                         "%s failed: %d\n", __func__, err);
2499                netif_device_detach(interface->netdev);
2500        }
2501}
2502
2503static const struct pci_error_handlers fm10k_err_handler = {
2504        .error_detected = fm10k_io_error_detected,
2505        .slot_reset = fm10k_io_slot_reset,
2506        .resume = fm10k_io_resume,
2507        .reset_prepare = fm10k_io_reset_prepare,
2508        .reset_done = fm10k_io_reset_done,
2509};
2510
2511static SIMPLE_DEV_PM_OPS(fm10k_pm_ops, fm10k_suspend, fm10k_resume);
2512
2513static struct pci_driver fm10k_driver = {
2514        .name                   = fm10k_driver_name,
2515        .id_table               = fm10k_pci_tbl,
2516        .probe                  = fm10k_probe,
2517        .remove                 = fm10k_remove,
2518        .driver = {
2519                .pm             = &fm10k_pm_ops,
2520        },
2521        .sriov_configure        = fm10k_iov_configure,
2522        .err_handler            = &fm10k_err_handler
2523};
2524
2525/**
2526 * fm10k_register_pci_driver - register driver interface
2527 *
2528 * This function is called on module load in order to register the driver.
2529 **/
2530int fm10k_register_pci_driver(void)
2531{
2532        return pci_register_driver(&fm10k_driver);
2533}
2534
2535/**
2536 * fm10k_unregister_pci_driver - unregister driver interface
2537 *
2538 * This function is called on module unload in order to remove the driver.
2539 **/
2540void fm10k_unregister_pci_driver(void)
2541{
2542        pci_unregister_driver(&fm10k_driver);
2543}
2544