amazon/ena/ena_netdev.c

0001 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
0002 /*
0003  * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
0004  */
0005
0006 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0007
0008 #ifdef CONFIG_RFS_ACCEL
0009 #include <linux/cpu_rmap.h>
0010 #endif /* CONFIG_RFS_ACCEL */
0011 #include <linux/ethtool.h>
0012 #include <linux/kernel.h>
0013 #include <linux/module.h>
0014 #include <linux/numa.h>
0015 #include <linux/pci.h>
0016 #include <linux/utsname.h>
0017 #include <linux/version.h>
0018 #include <linux/vmalloc.h>
0019 #include <net/ip.h>
0020
0021 #include "ena_netdev.h"
0022 #include <linux/bpf_trace.h>
0023 #include "ena_pci_id_tbl.h"
0024
0025 MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
0026 MODULE_DESCRIPTION(DEVICE_NAME);
0027 MODULE_LICENSE("GPL");
0028
0029 /* Time in jiffies before concluding the transmitter is hung. */
0030 #define TX_TIMEOUT  (5 * HZ)
0031
0032 #define ENA_MAX_RINGS min_t(unsigned int, ENA_MAX_NUM_IO_QUEUES, num_possible_cpus())
0033
0034 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_IFUP | \
0035         NETIF_MSG_TX_DONE | NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR)
0036
0037 static struct ena_aenq_handlers aenq_handlers;
0038
0039 static struct workqueue_struct *ena_wq;
0040
0041 MODULE_DEVICE_TABLE(pci, ena_pci_tbl);
0042
0043 static int ena_rss_init_default(struct ena_adapter *adapter);
0044 static void check_for_admin_com_state(struct ena_adapter *adapter);
0045 static void ena_destroy_device(struct ena_adapter *adapter, bool graceful);
0046 static int ena_restore_device(struct ena_adapter *adapter);
0047
0048 static void ena_init_io_rings(struct ena_adapter *adapter,
0049                   int first_index, int count);
0050 static void ena_init_napi_in_range(struct ena_adapter *adapter, int first_index,
0051                    int count);
0052 static void ena_del_napi_in_range(struct ena_adapter *adapter, int first_index,
0053                   int count);
0054 static int ena_setup_tx_resources(struct ena_adapter *adapter, int qid);
0055 static int ena_setup_tx_resources_in_range(struct ena_adapter *adapter,
0056                        int first_index,
0057                        int count);
0058 static int ena_create_io_tx_queue(struct ena_adapter *adapter, int qid);
0059 static void ena_free_tx_resources(struct ena_adapter *adapter, int qid);
0060 static int ena_clean_xdp_irq(struct ena_ring *xdp_ring, u32 budget);
0061 static void ena_destroy_all_tx_queues(struct ena_adapter *adapter);
0062 static void ena_free_all_io_tx_resources(struct ena_adapter *adapter);
0063 static void ena_napi_disable_in_range(struct ena_adapter *adapter,
0064                       int first_index, int count);
0065 static void ena_napi_enable_in_range(struct ena_adapter *adapter,
0066                      int first_index, int count);
0067 static int ena_up(struct ena_adapter *adapter);
0068 static void ena_down(struct ena_adapter *adapter);
0069 static void ena_unmask_interrupt(struct ena_ring *tx_ring,
0070                  struct ena_ring *rx_ring);
0071 static void ena_update_ring_numa_node(struct ena_ring *tx_ring,
0072                       struct ena_ring *rx_ring);
0073 static void ena_unmap_tx_buff(struct ena_ring *tx_ring,
0074                   struct ena_tx_buffer *tx_info);
0075 static int ena_create_io_tx_queues_in_range(struct ena_adapter *adapter,
0076                         int first_index, int count);
0077
0078 /* Increase a stat by cnt while holding syncp seqlock on 32bit machines */
0079 static void ena_increase_stat(u64 *statp, u64 cnt,
0080                   struct u64_stats_sync *syncp)
0081 {
0082     u64_stats_update_begin(syncp);
0083     (*statp) += cnt;
0084     u64_stats_update_end(syncp);
0085 }
0086
0087 static void ena_ring_tx_doorbell(struct ena_ring *tx_ring)
0088 {
0089     ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
0090     ena_increase_stat(&tx_ring->tx_stats.doorbells, 1, &tx_ring->syncp);
0091 }
0092
0093 static void ena_tx_timeout(struct net_device *dev, unsigned int txqueue)
0094 {
0095     struct ena_adapter *adapter = netdev_priv(dev);
0096
0097     /* Change the state of the device to trigger reset
0098      * Check that we are not in the middle or a trigger already
0099      */
0100
0101     if (test_and_set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))
0102         return;
0103
0104     ena_reset_device(adapter, ENA_REGS_RESET_OS_NETDEV_WD);
0105     ena_increase_stat(&adapter->dev_stats.tx_timeout, 1, &adapter->syncp);
0106
0107     netif_err(adapter, tx_err, dev, "Transmit time out\n");
0108 }
0109
0110 static void update_rx_ring_mtu(struct ena_adapter *adapter, int mtu)
0111 {
0112     int i;
0113
0114     for (i = 0; i < adapter->num_io_queues; i++)
0115         adapter->rx_ring[i].mtu = mtu;
0116 }
0117
0118 static int ena_change_mtu(struct net_device *dev, int new_mtu)
0119 {
0120     struct ena_adapter *adapter = netdev_priv(dev);
0121     int ret;
0122
0123     ret = ena_com_set_dev_mtu(adapter->ena_dev, new_mtu);
0124     if (!ret) {
0125         netif_dbg(adapter, drv, dev, "Set MTU to %d\n", new_mtu);
0126         update_rx_ring_mtu(adapter, new_mtu);
0127         dev->mtu = new_mtu;
0128     } else {
0129         netif_err(adapter, drv, dev, "Failed to set MTU to %d\n",
0130               new_mtu);
0131     }
0132
0133     return ret;
0134 }
0135
0136 static int ena_xmit_common(struct net_device *dev,
0137                struct ena_ring *ring,
0138                struct ena_tx_buffer *tx_info,
0139                struct ena_com_tx_ctx *ena_tx_ctx,
0140                u16 next_to_use,
0141                u32 bytes)
0142 {
0143     struct ena_adapter *adapter = netdev_priv(dev);
0144     int rc, nb_hw_desc;
0145
0146     if (unlikely(ena_com_is_doorbell_needed(ring->ena_com_io_sq,
0147                         ena_tx_ctx))) {
0148         netif_dbg(adapter, tx_queued, dev,
0149               "llq tx max burst size of queue %d achieved, writing doorbell to send burst\n",
0150               ring->qid);
0151         ena_ring_tx_doorbell(ring);
0152     }
0153
0154     /* prepare the packet's descriptors to dma engine */
0155     rc = ena_com_prepare_tx(ring->ena_com_io_sq, ena_tx_ctx,
0156                 &nb_hw_desc);
0157
0158     /* In case there isn't enough space in the queue for the packet,
0159      * we simply drop it. All other failure reasons of
0160      * ena_com_prepare_tx() are fatal and therefore require a device reset.
0161      */
0162     if (unlikely(rc)) {
0163         netif_err(adapter, tx_queued, dev,
0164               "Failed to prepare tx bufs\n");
0165         ena_increase_stat(&ring->tx_stats.prepare_ctx_err, 1,
0166                   &ring->syncp);
0167         if (rc != -ENOMEM)
0168             ena_reset_device(adapter,
0169                      ENA_REGS_RESET_DRIVER_INVALID_STATE);
0170         return rc;
0171     }
0172
0173     u64_stats_update_begin(&ring->syncp);
0174     ring->tx_stats.cnt++;
0175     ring->tx_stats.bytes += bytes;
0176     u64_stats_update_end(&ring->syncp);
0177
0178     tx_info->tx_descs = nb_hw_desc;
0179     tx_info->last_jiffies = jiffies;
0180     tx_info->print_once = 0;
0181
0182     ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use,
0183                          ring->ring_size);
0184     return 0;
0185 }
0186
0187 /* This is the XDP napi callback. XDP queues use a separate napi callback
0188  * than Rx/Tx queues.
0189  */
0190 static int ena_xdp_io_poll(struct napi_struct *napi, int budget)
0191 {
0192     struct ena_napi *ena_napi = container_of(napi, struct ena_napi, napi);
0193     u32 xdp_work_done, xdp_budget;
0194     struct ena_ring *xdp_ring;
0195     int napi_comp_call = 0;
0196     int ret;
0197
0198     xdp_ring = ena_napi->xdp_ring;
0199
0200     xdp_budget = budget;
0201
0202     if (!test_bit(ENA_FLAG_DEV_UP, &xdp_ring->adapter->flags) ||
0203         test_bit(ENA_FLAG_TRIGGER_RESET, &xdp_ring->adapter->flags)) {
0204         napi_complete_done(napi, 0);
0205         return 0;
0206     }
0207
0208     xdp_work_done = ena_clean_xdp_irq(xdp_ring, xdp_budget);
0209
0210     /* If the device is about to reset or down, avoid unmask
0211      * the interrupt and return 0 so NAPI won't reschedule
0212      */
0213     if (unlikely(!test_bit(ENA_FLAG_DEV_UP, &xdp_ring->adapter->flags))) {
0214         napi_complete_done(napi, 0);
0215         ret = 0;
0216     } else if (xdp_budget > xdp_work_done) {
0217         napi_comp_call = 1;
0218         if (napi_complete_done(napi, xdp_work_done))
0219             ena_unmask_interrupt(xdp_ring, NULL);
0220         ena_update_ring_numa_node(xdp_ring, NULL);
0221         ret = xdp_work_done;
0222     } else {
0223         ret = xdp_budget;
0224     }
0225
0226     u64_stats_update_begin(&xdp_ring->syncp);
0227     xdp_ring->tx_stats.napi_comp += napi_comp_call;
0228     xdp_ring->tx_stats.tx_poll++;
0229     u64_stats_update_end(&xdp_ring->syncp);
0230     xdp_ring->tx_stats.last_napi_jiffies = jiffies;
0231
0232     return ret;
0233 }
0234
0235 static int ena_xdp_tx_map_frame(struct ena_ring *xdp_ring,
0236                 struct ena_tx_buffer *tx_info,
0237                 struct xdp_frame *xdpf,
0238                 struct ena_com_tx_ctx *ena_tx_ctx)
0239 {
0240     struct ena_adapter *adapter = xdp_ring->adapter;
0241     struct ena_com_buf *ena_buf;
0242     int push_len = 0;
0243     dma_addr_t dma;
0244     void *data;
0245     u32 size;
0246
0247     tx_info->xdpf = xdpf;
0248     data = tx_info->xdpf->data;
0249     size = tx_info->xdpf->len;
0250
0251     if (xdp_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
0252         /* Designate part of the packet for LLQ */
0253         push_len = min_t(u32, size, xdp_ring->tx_max_header_size);
0254
0255         ena_tx_ctx->push_header = data;
0256
0257         size -= push_len;
0258         data += push_len;
0259     }
0260
0261     ena_tx_ctx->header_len = push_len;
0262
0263     if (size > 0) {
0264         dma = dma_map_single(xdp_ring->dev,
0265                      data,
0266                      size,
0267                      DMA_TO_DEVICE);
0268         if (unlikely(dma_mapping_error(xdp_ring->dev, dma)))
0269             goto error_report_dma_error;
0270
0271         tx_info->map_linear_data = 0;
0272
0273         ena_buf = tx_info->bufs;
0274         ena_buf->paddr = dma;
0275         ena_buf->len = size;
0276
0277         ena_tx_ctx->ena_bufs = ena_buf;
0278         ena_tx_ctx->num_bufs = tx_info->num_of_bufs = 1;
0279     }
0280
0281     return 0;
0282
0283 error_report_dma_error:
0284     ena_increase_stat(&xdp_ring->tx_stats.dma_mapping_err, 1,
0285               &xdp_ring->syncp);
0286     netif_warn(adapter, tx_queued, adapter->netdev, "Failed to map xdp buff\n");
0287
0288     return -EINVAL;
0289 }
0290
0291 static int ena_xdp_xmit_frame(struct ena_ring *xdp_ring,
0292                   struct net_device *dev,
0293                   struct xdp_frame *xdpf,
0294                   int flags)
0295 {
0296     struct ena_com_tx_ctx ena_tx_ctx = {};
0297     struct ena_tx_buffer *tx_info;
0298     u16 next_to_use, req_id;
0299     int rc;
0300
0301     next_to_use = xdp_ring->next_to_use;
0302     req_id = xdp_ring->free_ids[next_to_use];
0303     tx_info = &xdp_ring->tx_buffer_info[req_id];
0304     tx_info->num_of_bufs = 0;
0305
0306     rc = ena_xdp_tx_map_frame(xdp_ring, tx_info, xdpf, &ena_tx_ctx);
0307     if (unlikely(rc))
0308         return rc;
0309
0310     ena_tx_ctx.req_id = req_id;
0311
0312     rc = ena_xmit_common(dev,
0313                  xdp_ring,
0314                  tx_info,
0315                  &ena_tx_ctx,
0316                  next_to_use,
0317                  xdpf->len);
0318     if (rc)
0319         goto error_unmap_dma;
0320
0321     /* trigger the dma engine. ena_ring_tx_doorbell()
0322      * calls a memory barrier inside it.
0323      */
0324     if (flags & XDP_XMIT_FLUSH)
0325         ena_ring_tx_doorbell(xdp_ring);
0326
0327     return rc;
0328
0329 error_unmap_dma:
0330     ena_unmap_tx_buff(xdp_ring, tx_info);
0331     tx_info->xdpf = NULL;
0332     return rc;
0333 }
0334
0335 static int ena_xdp_xmit(struct net_device *dev, int n,
0336             struct xdp_frame **frames, u32 flags)
0337 {
0338     struct ena_adapter *adapter = netdev_priv(dev);
0339     struct ena_ring *xdp_ring;
0340     int qid, i, nxmit = 0;
0341
0342     if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
0343         return -EINVAL;
0344
0345     if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
0346         return -ENETDOWN;
0347
0348     /* We assume that all rings have the same XDP program */
0349     if (!READ_ONCE(adapter->rx_ring->xdp_bpf_prog))
0350         return -ENXIO;
0351
0352     qid = smp_processor_id() % adapter->xdp_num_queues;
0353     qid += adapter->xdp_first_ring;
0354     xdp_ring = &adapter->tx_ring[qid];
0355
0356     /* Other CPU ids might try to send thorugh this queue */
0357     spin_lock(&xdp_ring->xdp_tx_lock);
0358
0359     for (i = 0; i < n; i++) {
0360         if (ena_xdp_xmit_frame(xdp_ring, dev, frames[i], 0))
0361             break;
0362         nxmit++;
0363     }
0364
0365     /* Ring doorbell to make device aware of the packets */
0366     if (flags & XDP_XMIT_FLUSH)
0367         ena_ring_tx_doorbell(xdp_ring);
0368
0369     spin_unlock(&xdp_ring->xdp_tx_lock);
0370
0371     /* Return number of packets sent */
0372     return nxmit;
0373 }
0374
0375 static int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp)
0376 {
0377     struct bpf_prog *xdp_prog;
0378     struct ena_ring *xdp_ring;
0379     u32 verdict = XDP_PASS;
0380     struct xdp_frame *xdpf;
0381     u64 *xdp_stat;
0382
0383     xdp_prog = READ_ONCE(rx_ring->xdp_bpf_prog);
0384
0385     if (!xdp_prog)
0386         goto out;
0387
0388     verdict = bpf_prog_run_xdp(xdp_prog, xdp);
0389
0390     switch (verdict) {
0391     case XDP_TX:
0392         xdpf = xdp_convert_buff_to_frame(xdp);
0393         if (unlikely(!xdpf)) {
0394             trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
0395             xdp_stat = &rx_ring->rx_stats.xdp_aborted;
0396             verdict = XDP_ABORTED;
0397             break;
0398         }
0399
0400         /* Find xmit queue */
0401         xdp_ring = rx_ring->xdp_ring;
0402
0403         /* The XDP queues are shared between XDP_TX and XDP_REDIRECT */
0404         spin_lock(&xdp_ring->xdp_tx_lock);
0405
0406         if (ena_xdp_xmit_frame(xdp_ring, rx_ring->netdev, xdpf,
0407                        XDP_XMIT_FLUSH))
0408             xdp_return_frame(xdpf);
0409
0410         spin_unlock(&xdp_ring->xdp_tx_lock);
0411         xdp_stat = &rx_ring->rx_stats.xdp_tx;
0412         break;
0413     case XDP_REDIRECT:
0414         if (likely(!xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))) {
0415             xdp_stat = &rx_ring->rx_stats.xdp_redirect;
0416             break;
0417         }
0418         trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
0419         xdp_stat = &rx_ring->rx_stats.xdp_aborted;
0420         verdict = XDP_ABORTED;
0421         break;
0422     case XDP_ABORTED:
0423         trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
0424         xdp_stat = &rx_ring->rx_stats.xdp_aborted;
0425         break;
0426     case XDP_DROP:
0427         xdp_stat = &rx_ring->rx_stats.xdp_drop;
0428         break;
0429     case XDP_PASS:
0430         xdp_stat = &rx_ring->rx_stats.xdp_pass;
0431         break;
0432     default:
0433         bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, verdict);
0434         xdp_stat = &rx_ring->rx_stats.xdp_invalid;
0435     }
0436
0437     ena_increase_stat(xdp_stat, 1, &rx_ring->syncp);
0438 out:
0439     return verdict;
0440 }
0441
0442 static void ena_init_all_xdp_queues(struct ena_adapter *adapter)
0443 {
0444     adapter->xdp_first_ring = adapter->num_io_queues;
0445     adapter->xdp_num_queues = adapter->num_io_queues;
0446
0447     ena_init_io_rings(adapter,
0448               adapter->xdp_first_ring,
0449               adapter->xdp_num_queues);
0450 }
0451
0452 static int ena_setup_and_create_all_xdp_queues(struct ena_adapter *adapter)
0453 {
0454     int rc = 0;
0455
0456     rc = ena_setup_tx_resources_in_range(adapter, adapter->xdp_first_ring,
0457                          adapter->xdp_num_queues);
0458     if (rc)
0459         goto setup_err;
0460
0461     rc = ena_create_io_tx_queues_in_range(adapter,
0462                           adapter->xdp_first_ring,
0463                           adapter->xdp_num_queues);
0464     if (rc)
0465         goto create_err;
0466
0467     return 0;
0468
0469 create_err:
0470     ena_free_all_io_tx_resources(adapter);
0471 setup_err:
0472     return rc;
0473 }
0474
0475 /* Provides a way for both kernel and bpf-prog to know
0476  * more about the RX-queue a given XDP frame arrived on.
0477  */
0478 static int ena_xdp_register_rxq_info(struct ena_ring *rx_ring)
0479 {
0480     int rc;
0481
0482     rc = xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev, rx_ring->qid, 0);
0483
0484     if (rc) {
0485         netif_err(rx_ring->adapter, ifup, rx_ring->netdev,
0486               "Failed to register xdp rx queue info. RX queue num %d rc: %d\n",
0487               rx_ring->qid, rc);
0488         goto err;
0489     }
0490
0491     rc = xdp_rxq_info_reg_mem_model(&rx_ring->xdp_rxq, MEM_TYPE_PAGE_SHARED,
0492                     NULL);
0493
0494     if (rc) {
0495         netif_err(rx_ring->adapter, ifup, rx_ring->netdev,
0496               "Failed to register xdp rx queue info memory model. RX queue num %d rc: %d\n",
0497               rx_ring->qid, rc);
0498         xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
0499     }
0500
0501 err:
0502     return rc;
0503 }
0504
0505 static void ena_xdp_unregister_rxq_info(struct ena_ring *rx_ring)
0506 {
0507     xdp_rxq_info_unreg_mem_model(&rx_ring->xdp_rxq);
0508     xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
0509 }
0510
0511 static void ena_xdp_exchange_program_rx_in_range(struct ena_adapter *adapter,
0512                          struct bpf_prog *prog,
0513                          int first, int count)
0514 {
0515     struct ena_ring *rx_ring;
0516     int i = 0;
0517
0518     for (i = first; i < count; i++) {
0519         rx_ring = &adapter->rx_ring[i];
0520         xchg(&rx_ring->xdp_bpf_prog, prog);
0521         if (prog) {
0522             ena_xdp_register_rxq_info(rx_ring);
0523             rx_ring->rx_headroom = XDP_PACKET_HEADROOM;
0524         } else {
0525             ena_xdp_unregister_rxq_info(rx_ring);
0526             rx_ring->rx_headroom = NET_SKB_PAD;
0527         }
0528     }
0529 }
0530
0531 static void ena_xdp_exchange_program(struct ena_adapter *adapter,
0532                      struct bpf_prog *prog)
0533 {
0534     struct bpf_prog *old_bpf_prog = xchg(&adapter->xdp_bpf_prog, prog);
0535
0536     ena_xdp_exchange_program_rx_in_range(adapter,
0537                          prog,
0538                          0,
0539                          adapter->num_io_queues);
0540
0541     if (old_bpf_prog)
0542         bpf_prog_put(old_bpf_prog);
0543 }
0544
0545 static int ena_destroy_and_free_all_xdp_queues(struct ena_adapter *adapter)
0546 {
0547     bool was_up;
0548     int rc;
0549
0550     was_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
0551
0552     if (was_up)
0553         ena_down(adapter);
0554
0555     adapter->xdp_first_ring = 0;
0556     adapter->xdp_num_queues = 0;
0557     ena_xdp_exchange_program(adapter, NULL);
0558     if (was_up) {
0559         rc = ena_up(adapter);
0560         if (rc)
0561             return rc;
0562     }
0563     return 0;
0564 }
0565
0566 static int ena_xdp_set(struct net_device *netdev, struct netdev_bpf *bpf)
0567 {
0568     struct ena_adapter *adapter = netdev_priv(netdev);
0569     struct bpf_prog *prog = bpf->prog;
0570     struct bpf_prog *old_bpf_prog;
0571     int rc, prev_mtu;
0572     bool is_up;
0573
0574     is_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
0575     rc = ena_xdp_allowed(adapter);
0576     if (rc == ENA_XDP_ALLOWED) {
0577         old_bpf_prog = adapter->xdp_bpf_prog;
0578         if (prog) {
0579             if (!is_up) {
0580                 ena_init_all_xdp_queues(adapter);
0581             } else if (!old_bpf_prog) {
0582                 ena_down(adapter);
0583                 ena_init_all_xdp_queues(adapter);
0584             }
0585             ena_xdp_exchange_program(adapter, prog);
0586
0587             if (is_up && !old_bpf_prog) {
0588                 rc = ena_up(adapter);
0589                 if (rc)
0590                     return rc;
0591             }
0592         } else if (old_bpf_prog) {
0593             rc = ena_destroy_and_free_all_xdp_queues(adapter);
0594             if (rc)
0595                 return rc;
0596         }
0597
0598         prev_mtu = netdev->max_mtu;
0599         netdev->max_mtu = prog ? ENA_XDP_MAX_MTU : adapter->max_mtu;
0600
0601         if (!old_bpf_prog)
0602             netif_info(adapter, drv, adapter->netdev,
0603                    "XDP program is set, changing the max_mtu from %d to %d",
0604                    prev_mtu, netdev->max_mtu);
0605
0606     } else if (rc == ENA_XDP_CURRENT_MTU_TOO_LARGE) {
0607         netif_err(adapter, drv, adapter->netdev,
0608               "Failed to set xdp program, the current MTU (%d) is larger than the maximum allowed MTU (%lu) while xdp is on",
0609               netdev->mtu, ENA_XDP_MAX_MTU);
0610         NL_SET_ERR_MSG_MOD(bpf->extack,
0611                    "Failed to set xdp program, the current MTU is larger than the maximum allowed MTU. Check the dmesg for more info");
0612         return -EINVAL;
0613     } else if (rc == ENA_XDP_NO_ENOUGH_QUEUES) {
0614         netif_err(adapter, drv, adapter->netdev,
0615               "Failed to set xdp program, the Rx/Tx channel count should be at most half of the maximum allowed channel count. The current queue count (%d), the maximal queue count (%d)\n",
0616               adapter->num_io_queues, adapter->max_num_io_queues);
0617         NL_SET_ERR_MSG_MOD(bpf->extack,
0618                    "Failed to set xdp program, there is no enough space for allocating XDP queues, Check the dmesg for more info");
0619         return -EINVAL;
0620     }
0621
0622     return 0;
0623 }
0624
0625 /* This is the main xdp callback, it's used by the kernel to set/unset the xdp
0626  * program as well as to query the current xdp program id.
0627  */
0628 static int ena_xdp(struct net_device *netdev, struct netdev_bpf *bpf)
0629 {
0630     switch (bpf->command) {
0631     case XDP_SETUP_PROG:
0632         return ena_xdp_set(netdev, bpf);
0633     default:
0634         return -EINVAL;
0635     }
0636     return 0;
0637 }
0638
0639 static int ena_init_rx_cpu_rmap(struct ena_adapter *adapter)
0640 {
0641 #ifdef CONFIG_RFS_ACCEL
0642     u32 i;
0643     int rc;
0644
0645     adapter->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(adapter->num_io_queues);
0646     if (!adapter->netdev->rx_cpu_rmap)
0647         return -ENOMEM;
0648     for (i = 0; i < adapter->num_io_queues; i++) {
0649         int irq_idx = ENA_IO_IRQ_IDX(i);
0650
0651         rc = irq_cpu_rmap_add(adapter->netdev->rx_cpu_rmap,
0652                       pci_irq_vector(adapter->pdev, irq_idx));
0653         if (rc) {
0654             free_irq_cpu_rmap(adapter->netdev->rx_cpu_rmap);
0655             adapter->netdev->rx_cpu_rmap = NULL;
0656             return rc;
0657         }
0658     }
0659 #endif /* CONFIG_RFS_ACCEL */
0660     return 0;
0661 }
0662
0663 static void ena_init_io_rings_common(struct ena_adapter *adapter,
0664                      struct ena_ring *ring, u16 qid)
0665 {
0666     ring->qid = qid;
0667     ring->pdev = adapter->pdev;
0668     ring->dev = &adapter->pdev->dev;
0669     ring->netdev = adapter->netdev;
0670     ring->napi = &adapter->ena_napi[qid].napi;
0671     ring->adapter = adapter;
0672     ring->ena_dev = adapter->ena_dev;
0673     ring->per_napi_packets = 0;
0674     ring->cpu = 0;
0675     ring->no_interrupt_event_cnt = 0;
0676     u64_stats_init(&ring->syncp);
0677 }
0678
0679 static void ena_init_io_rings(struct ena_adapter *adapter,
0680                   int first_index, int count)
0681 {
0682     struct ena_com_dev *ena_dev;
0683     struct ena_ring *txr, *rxr;
0684     int i;
0685
0686     ena_dev = adapter->ena_dev;
0687
0688     for (i = first_index; i < first_index + count; i++) {
0689         txr = &adapter->tx_ring[i];
0690         rxr = &adapter->rx_ring[i];
0691
0692         /* TX common ring state */
0693         ena_init_io_rings_common(adapter, txr, i);
0694
0695         /* TX specific ring state */
0696         txr->ring_size = adapter->requested_tx_ring_size;
0697         txr->tx_max_header_size = ena_dev->tx_max_header_size;
0698         txr->tx_mem_queue_type = ena_dev->tx_mem_queue_type;
0699         txr->sgl_size = adapter->max_tx_sgl_size;
0700         txr->smoothed_interval =
0701             ena_com_get_nonadaptive_moderation_interval_tx(ena_dev);
0702         txr->disable_meta_caching = adapter->disable_meta_caching;
0703         spin_lock_init(&txr->xdp_tx_lock);
0704
0705         /* Don't init RX queues for xdp queues */
0706         if (!ENA_IS_XDP_INDEX(adapter, i)) {
0707             /* RX common ring state */
0708             ena_init_io_rings_common(adapter, rxr, i);
0709
0710             /* RX specific ring state */
0711             rxr->ring_size = adapter->requested_rx_ring_size;
0712             rxr->rx_copybreak = adapter->rx_copybreak;
0713             rxr->sgl_size = adapter->max_rx_sgl_size;
0714             rxr->smoothed_interval =
0715                 ena_com_get_nonadaptive_moderation_interval_rx(ena_dev);
0716             rxr->empty_rx_queue = 0;
0717             rxr->rx_headroom = NET_SKB_PAD;
0718             adapter->ena_napi[i].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
0719             rxr->xdp_ring = &adapter->tx_ring[i + adapter->num_io_queues];
0720         }
0721     }
0722 }
0723
0724 /* ena_setup_tx_resources - allocate I/O Tx resources (Descriptors)
0725  * @adapter: network interface device structure
0726  * @qid: queue index
0727  *
0728  * Return 0 on success, negative on failure
0729  */
0730 static int ena_setup_tx_resources(struct ena_adapter *adapter, int qid)
0731 {
0732     struct ena_ring *tx_ring = &adapter->tx_ring[qid];
0733     struct ena_irq *ena_irq = &adapter->irq_tbl[ENA_IO_IRQ_IDX(qid)];
0734     int size, i, node;
0735
0736     if (tx_ring->tx_buffer_info) {
0737         netif_err(adapter, ifup,
0738               adapter->netdev, "tx_buffer_info info is not NULL");
0739         return -EEXIST;
0740     }
0741
0742     size = sizeof(struct ena_tx_buffer) * tx_ring->ring_size;
0743     node = cpu_to_node(ena_irq->cpu);
0744
0745     tx_ring->tx_buffer_info = vzalloc_node(size, node);
0746     if (!tx_ring->tx_buffer_info) {
0747         tx_ring->tx_buffer_info = vzalloc(size);
0748         if (!tx_ring->tx_buffer_info)
0749             goto err_tx_buffer_info;
0750     }
0751
0752     size = sizeof(u16) * tx_ring->ring_size;
0753     tx_ring->free_ids = vzalloc_node(size, node);
0754     if (!tx_ring->free_ids) {
0755         tx_ring->free_ids = vzalloc(size);
0756         if (!tx_ring->free_ids)
0757             goto err_tx_free_ids;
0758     }
0759
0760     size = tx_ring->tx_max_header_size;
0761     tx_ring->push_buf_intermediate_buf = vzalloc_node(size, node);
0762     if (!tx_ring->push_buf_intermediate_buf) {
0763         tx_ring->push_buf_intermediate_buf = vzalloc(size);
0764         if (!tx_ring->push_buf_intermediate_buf)
0765             goto err_push_buf_intermediate_buf;
0766     }
0767
0768     /* Req id ring for TX out of order completions */
0769     for (i = 0; i < tx_ring->ring_size; i++)
0770         tx_ring->free_ids[i] = i;
0771
0772     /* Reset tx statistics */
0773     memset(&tx_ring->tx_stats, 0x0, sizeof(tx_ring->tx_stats));
0774
0775     tx_ring->next_to_use = 0;
0776     tx_ring->next_to_clean = 0;
0777     tx_ring->cpu = ena_irq->cpu;
0778     return 0;
0779
0780 err_push_buf_intermediate_buf:
0781     vfree(tx_ring->free_ids);
0782     tx_ring->free_ids = NULL;
0783 err_tx_free_ids:
0784     vfree(tx_ring->tx_buffer_info);
0785     tx_ring->tx_buffer_info = NULL;
0786 err_tx_buffer_info:
0787     return -ENOMEM;
0788 }
0789
0790 /* ena_free_tx_resources - Free I/O Tx Resources per Queue
0791  * @adapter: network interface device structure
0792  * @qid: queue index
0793  *
0794  * Free all transmit software resources
0795  */
0796 static void ena_free_tx_resources(struct ena_adapter *adapter, int qid)
0797 {
0798     struct ena_ring *tx_ring = &adapter->tx_ring[qid];
0799
0800     vfree(tx_ring->tx_buffer_info);
0801     tx_ring->tx_buffer_info = NULL;
0802
0803     vfree(tx_ring->free_ids);
0804     tx_ring->free_ids = NULL;
0805
0806     vfree(tx_ring->push_buf_intermediate_buf);
0807     tx_ring->push_buf_intermediate_buf = NULL;
0808 }
0809
0810 static int ena_setup_tx_resources_in_range(struct ena_adapter *adapter,
0811                        int first_index,
0812                        int count)
0813 {
0814     int i, rc = 0;
0815
0816     for (i = first_index; i < first_index + count; i++) {
0817         rc = ena_setup_tx_resources(adapter, i);
0818         if (rc)
0819             goto err_setup_tx;
0820     }
0821
0822     return 0;
0823
0824 err_setup_tx:
0825
0826     netif_err(adapter, ifup, adapter->netdev,
0827           "Tx queue %d: allocation failed\n", i);
0828
0829     /* rewind the index freeing the rings as we go */
0830     while (first_index < i--)
0831         ena_free_tx_resources(adapter, i);
0832     return rc;
0833 }
0834
0835 static void ena_free_all_io_tx_resources_in_range(struct ena_adapter *adapter,
0836                           int first_index, int count)
0837 {
0838     int i;
0839
0840     for (i = first_index; i < first_index + count; i++)
0841         ena_free_tx_resources(adapter, i);
0842 }
0843
0844 /* ena_free_all_io_tx_resources - Free I/O Tx Resources for All Queues
0845  * @adapter: board private structure
0846  *
0847  * Free all transmit software resources
0848  */
0849 static void ena_free_all_io_tx_resources(struct ena_adapter *adapter)
0850 {
0851     ena_free_all_io_tx_resources_in_range(adapter,
0852                           0,
0853                           adapter->xdp_num_queues +
0854                           adapter->num_io_queues);
0855 }
0856
0857 /* ena_setup_rx_resources - allocate I/O Rx resources (Descriptors)
0858  * @adapter: network interface device structure
0859  * @qid: queue index
0860  *
0861  * Returns 0 on success, negative on failure
0862  */
0863 static int ena_setup_rx_resources(struct ena_adapter *adapter,
0864                   u32 qid)
0865 {
0866     struct ena_ring *rx_ring = &adapter->rx_ring[qid];
0867     struct ena_irq *ena_irq = &adapter->irq_tbl[ENA_IO_IRQ_IDX(qid)];
0868     int size, node, i;
0869
0870     if (rx_ring->rx_buffer_info) {
0871         netif_err(adapter, ifup, adapter->netdev,
0872               "rx_buffer_info is not NULL");
0873         return -EEXIST;
0874     }
0875
0876     /* alloc extra element so in rx path
0877      * we can always prefetch rx_info + 1
0878      */
0879     size = sizeof(struct ena_rx_buffer) * (rx_ring->ring_size + 1);
0880     node = cpu_to_node(ena_irq->cpu);
0881
0882     rx_ring->rx_buffer_info = vzalloc_node(size, node);
0883     if (!rx_ring->rx_buffer_info) {
0884         rx_ring->rx_buffer_info = vzalloc(size);
0885         if (!rx_ring->rx_buffer_info)
0886             return -ENOMEM;
0887     }
0888
0889     size = sizeof(u16) * rx_ring->ring_size;
0890     rx_ring->free_ids = vzalloc_node(size, node);
0891     if (!rx_ring->free_ids) {
0892         rx_ring->free_ids = vzalloc(size);
0893         if (!rx_ring->free_ids) {
0894             vfree(rx_ring->rx_buffer_info);
0895             rx_ring->rx_buffer_info = NULL;
0896             return -ENOMEM;
0897         }
0898     }
0899
0900     /* Req id ring for receiving RX pkts out of order */
0901     for (i = 0; i < rx_ring->ring_size; i++)
0902         rx_ring->free_ids[i] = i;
0903
0904     /* Reset rx statistics */
0905     memset(&rx_ring->rx_stats, 0x0, sizeof(rx_ring->rx_stats));
0906
0907     rx_ring->next_to_clean = 0;
0908     rx_ring->next_to_use = 0;
0909     rx_ring->cpu = ena_irq->cpu;
0910
0911     return 0;
0912 }
0913
0914 /* ena_free_rx_resources - Free I/O Rx Resources
0915  * @adapter: network interface device structure
0916  * @qid: queue index
0917  *
0918  * Free all receive software resources
0919  */
0920 static void ena_free_rx_resources(struct ena_adapter *adapter,
0921                   u32 qid)
0922 {
0923     struct ena_ring *rx_ring = &adapter->rx_ring[qid];
0924
0925     vfree(rx_ring->rx_buffer_info);
0926     rx_ring->rx_buffer_info = NULL;
0927
0928     vfree(rx_ring->free_ids);
0929     rx_ring->free_ids = NULL;
0930 }
0931
0932 /* ena_setup_all_rx_resources - allocate I/O Rx queues resources for all queues
0933  * @adapter: board private structure
0934  *
0935  * Return 0 on success, negative on failure
0936  */
0937 static int ena_setup_all_rx_resources(struct ena_adapter *adapter)
0938 {
0939     int i, rc = 0;
0940
0941     for (i = 0; i < adapter->num_io_queues; i++) {
0942         rc = ena_setup_rx_resources(adapter, i);
0943         if (rc)
0944             goto err_setup_rx;
0945     }
0946
0947     return 0;
0948
0949 err_setup_rx:
0950
0951     netif_err(adapter, ifup, adapter->netdev,
0952           "Rx queue %d: allocation failed\n", i);
0953
0954     /* rewind the index freeing the rings as we go */
0955     while (i--)
0956         ena_free_rx_resources(adapter, i);
0957     return rc;
0958 }
0959
0960 /* ena_free_all_io_rx_resources - Free I/O Rx Resources for All Queues
0961  * @adapter: board private structure
0962  *
0963  * Free all receive software resources
0964  */
0965 static void ena_free_all_io_rx_resources(struct ena_adapter *adapter)
0966 {
0967     int i;
0968
0969     for (i = 0; i < adapter->num_io_queues; i++)
0970         ena_free_rx_resources(adapter, i);
0971 }
0972
0973 static struct page *ena_alloc_map_page(struct ena_ring *rx_ring,
0974                        dma_addr_t *dma)
0975 {
0976     struct page *page;
0977
0978     /* This would allocate the page on the same NUMA node the executing code
0979      * is running on.
0980      */
0981     page = dev_alloc_page();
0982     if (!page) {
0983         ena_increase_stat(&rx_ring->rx_stats.page_alloc_fail, 1,
0984                   &rx_ring->syncp);
0985         return ERR_PTR(-ENOSPC);
0986     }
0987
0988     /* To enable NIC-side port-mirroring, AKA SPAN port,
0989      * we make the buffer readable from the nic as well
0990      */
0991     *dma = dma_map_page(rx_ring->dev, page, 0, ENA_PAGE_SIZE,
0992                 DMA_BIDIRECTIONAL);
0993     if (unlikely(dma_mapping_error(rx_ring->dev, *dma))) {
0994         ena_increase_stat(&rx_ring->rx_stats.dma_mapping_err, 1,
0995                   &rx_ring->syncp);
0996         __free_page(page);
0997         return ERR_PTR(-EIO);
0998     }
0999
1000     return page;
1001 }
1002
1003 static int ena_alloc_rx_buffer(struct ena_ring *rx_ring,
1004                    struct ena_rx_buffer *rx_info)
1005 {
1006     int headroom = rx_ring->rx_headroom;
1007     struct ena_com_buf *ena_buf;
1008     struct page *page;
1009     dma_addr_t dma;
1010     int tailroom;
1011
1012     /* restore page offset value in case it has been changed by device */
1013     rx_info->page_offset = headroom;
1014
1015     /* if previous allocated page is not used */
1016     if (unlikely(rx_info->page))
1017         return 0;
1018
1019     /* We handle DMA here */
1020     page = ena_alloc_map_page(rx_ring, &dma);
1021     if (unlikely(IS_ERR(page)))
1022         return PTR_ERR(page);
1023
1024     netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1025           "Allocate page %p, rx_info %p\n", page, rx_info);
1026
1027     tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1028
1029     rx_info->page = page;
1030     ena_buf = &rx_info->ena_buf;
1031     ena_buf->paddr = dma + headroom;
1032     ena_buf->len = ENA_PAGE_SIZE - headroom - tailroom;
1033
1034     return 0;
1035 }
1036
1037 static void ena_unmap_rx_buff(struct ena_ring *rx_ring,
1038                   struct ena_rx_buffer *rx_info)
1039 {
1040     struct ena_com_buf *ena_buf = &rx_info->ena_buf;
1041
1042     dma_unmap_page(rx_ring->dev, ena_buf->paddr - rx_ring->rx_headroom,
1043                ENA_PAGE_SIZE,
1044                DMA_BIDIRECTIONAL);
1045 }
1046
1047 static void ena_free_rx_page(struct ena_ring *rx_ring,
1048                  struct ena_rx_buffer *rx_info)
1049 {
1050     struct page *page = rx_info->page;
1051
1052     if (unlikely(!page)) {
1053         netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
1054                "Trying to free unallocated buffer\n");
1055         return;
1056     }
1057
1058     ena_unmap_rx_buff(rx_ring, rx_info);
1059
1060     __free_page(page);
1061     rx_info->page = NULL;
1062 }
1063
1064 static int ena_refill_rx_bufs(struct ena_ring *rx_ring, u32 num)
1065 {
1066     u16 next_to_use, req_id;
1067     u32 i;
1068     int rc;
1069
1070     next_to_use = rx_ring->next_to_use;
1071
1072     for (i = 0; i < num; i++) {
1073         struct ena_rx_buffer *rx_info;
1074
1075         req_id = rx_ring->free_ids[next_to_use];
1076
1077         rx_info = &rx_ring->rx_buffer_info[req_id];
1078
1079         rc = ena_alloc_rx_buffer(rx_ring, rx_info);
1080         if (unlikely(rc < 0)) {
1081             netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
1082                    "Failed to allocate buffer for rx queue %d\n",
1083                    rx_ring->qid);
1084             break;
1085         }
1086         rc = ena_com_add_single_rx_desc(rx_ring->ena_com_io_sq,
1087                         &rx_info->ena_buf,
1088                         req_id);
1089         if (unlikely(rc)) {
1090             netif_warn(rx_ring->adapter, rx_status, rx_ring->netdev,
1091                    "Failed to add buffer for rx queue %d\n",
1092                    rx_ring->qid);
1093             break;
1094         }
1095         next_to_use = ENA_RX_RING_IDX_NEXT(next_to_use,
1096                            rx_ring->ring_size);
1097     }
1098
1099     if (unlikely(i < num)) {
1100         ena_increase_stat(&rx_ring->rx_stats.refil_partial, 1,
1101                   &rx_ring->syncp);
1102         netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
1103                "Refilled rx qid %d with only %d buffers (from %d)\n",
1104                rx_ring->qid, i, num);
1105     }
1106
1107     /* ena_com_write_sq_doorbell issues a wmb() */
1108     if (likely(i))
1109         ena_com_write_sq_doorbell(rx_ring->ena_com_io_sq);
1110
1111     rx_ring->next_to_use = next_to_use;
1112
1113     return i;
1114 }
1115
1116 static void ena_free_rx_bufs(struct ena_adapter *adapter,
1117                  u32 qid)
1118 {
1119     struct ena_ring *rx_ring = &adapter->rx_ring[qid];
1120     u32 i;
1121
1122     for (i = 0; i < rx_ring->ring_size; i++) {
1123         struct ena_rx_buffer *rx_info = &rx_ring->rx_buffer_info[i];
1124
1125         if (rx_info->page)
1126             ena_free_rx_page(rx_ring, rx_info);
1127     }
1128 }
1129
1130 /* ena_refill_all_rx_bufs - allocate all queues Rx buffers
1131  * @adapter: board private structure
1132  */
1133 static void ena_refill_all_rx_bufs(struct ena_adapter *adapter)
1134 {
1135     struct ena_ring *rx_ring;
1136     int i, rc, bufs_num;
1137
1138     for (i = 0; i < adapter->num_io_queues; i++) {
1139         rx_ring = &adapter->rx_ring[i];
1140         bufs_num = rx_ring->ring_size - 1;
1141         rc = ena_refill_rx_bufs(rx_ring, bufs_num);
1142
1143         if (unlikely(rc != bufs_num))
1144             netif_warn(rx_ring->adapter, rx_status, rx_ring->netdev,
1145                    "Refilling Queue %d failed. allocated %d buffers from: %d\n",
1146                    i, rc, bufs_num);
1147     }
1148 }
1149
1150 static void ena_free_all_rx_bufs(struct ena_adapter *adapter)
1151 {
1152     int i;
1153
1154     for (i = 0; i < adapter->num_io_queues; i++)
1155         ena_free_rx_bufs(adapter, i);
1156 }
1157
1158 static void ena_unmap_tx_buff(struct ena_ring *tx_ring,
1159                   struct ena_tx_buffer *tx_info)
1160 {
1161     struct ena_com_buf *ena_buf;
1162     u32 cnt;
1163     int i;
1164
1165     ena_buf = tx_info->bufs;
1166     cnt = tx_info->num_of_bufs;
1167
1168     if (unlikely(!cnt))
1169         return;
1170
1171     if (tx_info->map_linear_data) {
1172         dma_unmap_single(tx_ring->dev,
1173                  dma_unmap_addr(ena_buf, paddr),
1174                  dma_unmap_len(ena_buf, len),
1175                  DMA_TO_DEVICE);
1176         ena_buf++;
1177         cnt--;
1178     }
1179
1180     /* unmap remaining mapped pages */
1181     for (i = 0; i < cnt; i++) {
1182         dma_unmap_page(tx_ring->dev, dma_unmap_addr(ena_buf, paddr),
1183                    dma_unmap_len(ena_buf, len), DMA_TO_DEVICE);
1184         ena_buf++;
1185     }
1186 }
1187
1188 /* ena_free_tx_bufs - Free Tx Buffers per Queue
1189  * @tx_ring: TX ring for which buffers be freed
1190  */
1191 static void ena_free_tx_bufs(struct ena_ring *tx_ring)
1192 {
1193     bool print_once = true;
1194     u32 i;
1195
1196     for (i = 0; i < tx_ring->ring_size; i++) {
1197         struct ena_tx_buffer *tx_info = &tx_ring->tx_buffer_info[i];
1198
1199         if (!tx_info->skb)
1200             continue;
1201
1202         if (print_once) {
1203             netif_notice(tx_ring->adapter, ifdown, tx_ring->netdev,
1204                      "Free uncompleted tx skb qid %d idx 0x%x\n",
1205                      tx_ring->qid, i);
1206             print_once = false;
1207         } else {
1208             netif_dbg(tx_ring->adapter, ifdown, tx_ring->netdev,
1209                   "Free uncompleted tx skb qid %d idx 0x%x\n",
1210                   tx_ring->qid, i);
1211         }
1212
1213         ena_unmap_tx_buff(tx_ring, tx_info);
1214
1215         dev_kfree_skb_any(tx_info->skb);
1216     }
1217     netdev_tx_reset_queue(netdev_get_tx_queue(tx_ring->netdev,
1218                           tx_ring->qid));
1219 }
1220
1221 static void ena_free_all_tx_bufs(struct ena_adapter *adapter)
1222 {
1223     struct ena_ring *tx_ring;
1224     int i;
1225
1226     for (i = 0; i < adapter->num_io_queues + adapter->xdp_num_queues; i++) {
1227         tx_ring = &adapter->tx_ring[i];
1228         ena_free_tx_bufs(tx_ring);
1229     }
1230 }
1231
1232 static void ena_destroy_all_tx_queues(struct ena_adapter *adapter)
1233 {
1234     u16 ena_qid;
1235     int i;
1236
1237     for (i = 0; i < adapter->num_io_queues + adapter->xdp_num_queues; i++) {
1238         ena_qid = ENA_IO_TXQ_IDX(i);
1239         ena_com_destroy_io_queue(adapter->ena_dev, ena_qid);
1240     }
1241 }
1242
1243 static void ena_destroy_all_rx_queues(struct ena_adapter *adapter)
1244 {
1245     u16 ena_qid;
1246     int i;
1247
1248     for (i = 0; i < adapter->num_io_queues; i++) {
1249         ena_qid = ENA_IO_RXQ_IDX(i);
1250         cancel_work_sync(&adapter->ena_napi[i].dim.work);
1251         ena_com_destroy_io_queue(adapter->ena_dev, ena_qid);
1252     }
1253 }
1254
1255 static void ena_destroy_all_io_queues(struct ena_adapter *adapter)
1256 {
1257     ena_destroy_all_tx_queues(adapter);
1258     ena_destroy_all_rx_queues(adapter);
1259 }
1260
1261 static int handle_invalid_req_id(struct ena_ring *ring, u16 req_id,
1262                  struct ena_tx_buffer *tx_info, bool is_xdp)
1263 {
1264     if (tx_info)
1265         netif_err(ring->adapter,
1266               tx_done,
1267               ring->netdev,
1268               "tx_info doesn't have valid %s. qid %u req_id %u",
1269                is_xdp ? "xdp frame" : "skb", ring->qid, req_id);
1270     else
1271         netif_err(ring->adapter,
1272               tx_done,
1273               ring->netdev,
1274               "Invalid req_id %u in qid %u\n",
1275               req_id, ring->qid);
1276
1277     ena_increase_stat(&ring->tx_stats.bad_req_id, 1, &ring->syncp);
1278     ena_reset_device(ring->adapter, ENA_REGS_RESET_INV_TX_REQ_ID);
1279
1280     return -EFAULT;
1281 }
1282
1283 static int validate_tx_req_id(struct ena_ring *tx_ring, u16 req_id)
1284 {
1285     struct ena_tx_buffer *tx_info;
1286
1287     tx_info = &tx_ring->tx_buffer_info[req_id];
1288     if (likely(tx_info->skb))
1289         return 0;
1290
1291     return handle_invalid_req_id(tx_ring, req_id, tx_info, false);
1292 }
1293
1294 static int validate_xdp_req_id(struct ena_ring *xdp_ring, u16 req_id)
1295 {
1296     struct ena_tx_buffer *tx_info;
1297
1298     tx_info = &xdp_ring->tx_buffer_info[req_id];
1299     if (likely(tx_info->xdpf))
1300         return 0;
1301
1302     return handle_invalid_req_id(xdp_ring, req_id, tx_info, true);
1303 }
1304
1305 static int ena_clean_tx_irq(struct ena_ring *tx_ring, u32 budget)
1306 {
1307     struct netdev_queue *txq;
1308     bool above_thresh;
1309     u32 tx_bytes = 0;
1310     u32 total_done = 0;
1311     u16 next_to_clean;
1312     u16 req_id;
1313     int tx_pkts = 0;
1314     int rc;
1315
1316     next_to_clean = tx_ring->next_to_clean;
1317     txq = netdev_get_tx_queue(tx_ring->netdev, tx_ring->qid);
1318
1319     while (tx_pkts < budget) {
1320         struct ena_tx_buffer *tx_info;
1321         struct sk_buff *skb;
1322
1323         rc = ena_com_tx_comp_req_id_get(tx_ring->ena_com_io_cq,
1324                         &req_id);
1325         if (rc) {
1326             if (unlikely(rc == -EINVAL))
1327                 handle_invalid_req_id(tx_ring, req_id, NULL,
1328                               false);
1329             break;
1330         }
1331
1332         /* validate that the request id points to a valid skb */
1333         rc = validate_tx_req_id(tx_ring, req_id);
1334         if (rc)
1335             break;
1336
1337         tx_info = &tx_ring->tx_buffer_info[req_id];
1338         skb = tx_info->skb;
1339
1340         /* prefetch skb_end_pointer() to speedup skb_shinfo(skb) */
1341         prefetch(&skb->end);
1342
1343         tx_info->skb = NULL;
1344         tx_info->last_jiffies = 0;
1345
1346         ena_unmap_tx_buff(tx_ring, tx_info);
1347
1348         netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
1349               "tx_poll: q %d skb %p completed\n", tx_ring->qid,
1350               skb);
1351
1352         tx_bytes += skb->len;
1353         dev_kfree_skb(skb);
1354         tx_pkts++;
1355         total_done += tx_info->tx_descs;
1356
1357         tx_ring->free_ids[next_to_clean] = req_id;
1358         next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean,
1359                              tx_ring->ring_size);
1360     }
1361
1362     tx_ring->next_to_clean = next_to_clean;
1363     ena_com_comp_ack(tx_ring->ena_com_io_sq, total_done);
1364     ena_com_update_dev_comp_head(tx_ring->ena_com_io_cq);
1365
1366     netdev_tx_completed_queue(txq, tx_pkts, tx_bytes);
1367
1368     netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
1369           "tx_poll: q %d done. total pkts: %d\n",
1370           tx_ring->qid, tx_pkts);
1371
1372     /* need to make the rings circular update visible to
1373      * ena_start_xmit() before checking for netif_queue_stopped().
1374      */
1375     smp_mb();
1376
1377     above_thresh = ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
1378                             ENA_TX_WAKEUP_THRESH);
1379     if (unlikely(netif_tx_queue_stopped(txq) && above_thresh)) {
1380         __netif_tx_lock(txq, smp_processor_id());
1381         above_thresh =
1382             ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
1383                              ENA_TX_WAKEUP_THRESH);
1384         if (netif_tx_queue_stopped(txq) && above_thresh &&
1385             test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags)) {
1386             netif_tx_wake_queue(txq);
1387             ena_increase_stat(&tx_ring->tx_stats.queue_wakeup, 1,
1388                       &tx_ring->syncp);
1389         }
1390         __netif_tx_unlock(txq);
1391     }
1392
1393     return tx_pkts;
1394 }
1395
1396 static struct sk_buff *ena_alloc_skb(struct ena_ring *rx_ring, void *first_frag)
1397 {
1398     struct sk_buff *skb;
1399
1400     if (!first_frag)
1401         skb = napi_alloc_skb(rx_ring->napi, rx_ring->rx_copybreak);
1402     else
1403         skb = napi_build_skb(first_frag, ENA_PAGE_SIZE);
1404
1405     if (unlikely(!skb)) {
1406         ena_increase_stat(&rx_ring->rx_stats.skb_alloc_fail, 1,
1407                   &rx_ring->syncp);
1408
1409         netif_dbg(rx_ring->adapter, rx_err, rx_ring->netdev,
1410               "Failed to allocate skb. first_frag %s\n",
1411               first_frag ? "provided" : "not provided");
1412         return NULL;
1413     }
1414
1415     return skb;
1416 }
1417
1418 static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring,
1419                   struct ena_com_rx_buf_info *ena_bufs,
1420                   u32 descs,
1421                   u16 *next_to_clean)
1422 {
1423     struct ena_rx_buffer *rx_info;
1424     struct ena_adapter *adapter;
1425     u16 len, req_id, buf = 0;
1426     struct sk_buff *skb;
1427     void *page_addr;
1428     u32 page_offset;
1429     void *data_addr;
1430
1431     len = ena_bufs[buf].len;
1432     req_id = ena_bufs[buf].req_id;
1433
1434     rx_info = &rx_ring->rx_buffer_info[req_id];
1435
1436     if (unlikely(!rx_info->page)) {
1437         adapter = rx_ring->adapter;
1438         netif_err(adapter, rx_err, rx_ring->netdev,
1439               "Page is NULL. qid %u req_id %u\n", rx_ring->qid, req_id);
1440         ena_increase_stat(&rx_ring->rx_stats.bad_req_id, 1, &rx_ring->syncp);
1441         ena_reset_device(adapter, ENA_REGS_RESET_INV_RX_REQ_ID);
1442         return NULL;
1443     }
1444
1445     netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1446           "rx_info %p page %p\n",
1447           rx_info, rx_info->page);
1448
1449     /* save virt address of first buffer */
1450     page_addr = page_address(rx_info->page);
1451     page_offset = rx_info->page_offset;
1452     data_addr = page_addr + page_offset;
1453
1454     prefetch(data_addr);
1455
1456     if (len <= rx_ring->rx_copybreak) {
1457         skb = ena_alloc_skb(rx_ring, NULL);
1458         if (unlikely(!skb))
1459             return NULL;
1460
1461         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1462               "RX allocated small packet. len %d. data_len %d\n",
1463               skb->len, skb->data_len);
1464
1465         /* sync this buffer for CPU use */
1466         dma_sync_single_for_cpu(rx_ring->dev,
1467                     dma_unmap_addr(&rx_info->ena_buf, paddr),
1468                     len,
1469                     DMA_FROM_DEVICE);
1470         skb_copy_to_linear_data(skb, data_addr, len);
1471         dma_sync_single_for_device(rx_ring->dev,
1472                        dma_unmap_addr(&rx_info->ena_buf, paddr),
1473                        len,
1474                        DMA_FROM_DEVICE);
1475
1476         skb_put(skb, len);
1477         skb->protocol = eth_type_trans(skb, rx_ring->netdev);
1478         rx_ring->free_ids[*next_to_clean] = req_id;
1479         *next_to_clean = ENA_RX_RING_IDX_ADD(*next_to_clean, descs,
1480                              rx_ring->ring_size);
1481         return skb;
1482     }
1483
1484     ena_unmap_rx_buff(rx_ring, rx_info);
1485
1486     skb = ena_alloc_skb(rx_ring, page_addr);
1487     if (unlikely(!skb))
1488         return NULL;
1489
1490     /* Populate skb's linear part */
1491     skb_reserve(skb, page_offset);
1492     skb_put(skb, len);
1493     skb->protocol = eth_type_trans(skb, rx_ring->netdev);
1494
1495     do {
1496         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1497               "RX skb updated. len %d. data_len %d\n",
1498               skb->len, skb->data_len);
1499
1500         rx_info->page = NULL;
1501
1502         rx_ring->free_ids[*next_to_clean] = req_id;
1503         *next_to_clean =
1504             ENA_RX_RING_IDX_NEXT(*next_to_clean,
1505                          rx_ring->ring_size);
1506         if (likely(--descs == 0))
1507             break;
1508
1509         buf++;
1510         len = ena_bufs[buf].len;
1511         req_id = ena_bufs[buf].req_id;
1512
1513         rx_info = &rx_ring->rx_buffer_info[req_id];
1514
1515         ena_unmap_rx_buff(rx_ring, rx_info);
1516
1517         skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_info->page,
1518                 rx_info->page_offset, len, ENA_PAGE_SIZE);
1519
1520     } while (1);
1521
1522     return skb;
1523 }
1524
1525 /* ena_rx_checksum - indicate in skb if hw indicated a good cksum
1526  * @adapter: structure containing adapter specific data
1527  * @ena_rx_ctx: received packet context/metadata
1528  * @skb: skb currently being received and modified
1529  */
1530 static void ena_rx_checksum(struct ena_ring *rx_ring,
1531                    struct ena_com_rx_ctx *ena_rx_ctx,
1532                    struct sk_buff *skb)
1533 {
1534     /* Rx csum disabled */
1535     if (unlikely(!(rx_ring->netdev->features & NETIF_F_RXCSUM))) {
1536         skb->ip_summed = CHECKSUM_NONE;
1537         return;
1538     }
1539
1540     /* For fragmented packets the checksum isn't valid */
1541     if (ena_rx_ctx->frag) {
1542         skb->ip_summed = CHECKSUM_NONE;
1543         return;
1544     }
1545
1546     /* if IP and error */
1547     if (unlikely((ena_rx_ctx->l3_proto == ENA_ETH_IO_L3_PROTO_IPV4) &&
1548              (ena_rx_ctx->l3_csum_err))) {
1549         /* ipv4 checksum error */
1550         skb->ip_summed = CHECKSUM_NONE;
1551         ena_increase_stat(&rx_ring->rx_stats.csum_bad, 1,
1552                   &rx_ring->syncp);
1553         netif_dbg(rx_ring->adapter, rx_err, rx_ring->netdev,
1554               "RX IPv4 header checksum error\n");
1555         return;
1556     }
1557
1558     /* if TCP/UDP */
1559     if (likely((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) ||
1560            (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP))) {
1561         if (unlikely(ena_rx_ctx->l4_csum_err)) {
1562             /* TCP/UDP checksum error */
1563             ena_increase_stat(&rx_ring->rx_stats.csum_bad, 1,
1564                       &rx_ring->syncp);
1565             netif_dbg(rx_ring->adapter, rx_err, rx_ring->netdev,
1566                   "RX L4 checksum error\n");
1567             skb->ip_summed = CHECKSUM_NONE;
1568             return;
1569         }
1570
1571         if (likely(ena_rx_ctx->l4_csum_checked)) {
1572             skb->ip_summed = CHECKSUM_UNNECESSARY;
1573             ena_increase_stat(&rx_ring->rx_stats.csum_good, 1,
1574                       &rx_ring->syncp);
1575         } else {
1576             ena_increase_stat(&rx_ring->rx_stats.csum_unchecked, 1,
1577                       &rx_ring->syncp);
1578             skb->ip_summed = CHECKSUM_NONE;
1579         }
1580     } else {
1581         skb->ip_summed = CHECKSUM_NONE;
1582         return;
1583     }
1584
1585 }
1586
1587 static void ena_set_rx_hash(struct ena_ring *rx_ring,
1588                 struct ena_com_rx_ctx *ena_rx_ctx,
1589                 struct sk_buff *skb)
1590 {
1591     enum pkt_hash_types hash_type;
1592
1593     if (likely(rx_ring->netdev->features & NETIF_F_RXHASH)) {
1594         if (likely((ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_TCP) ||
1595                (ena_rx_ctx->l4_proto == ENA_ETH_IO_L4_PROTO_UDP)))
1596
1597             hash_type = PKT_HASH_TYPE_L4;
1598         else
1599             hash_type = PKT_HASH_TYPE_NONE;
1600
1601         /* Override hash type if the packet is fragmented */
1602         if (ena_rx_ctx->frag)
1603             hash_type = PKT_HASH_TYPE_NONE;
1604
1605         skb_set_hash(skb, ena_rx_ctx->hash, hash_type);
1606     }
1607 }
1608
1609 static int ena_xdp_handle_buff(struct ena_ring *rx_ring, struct xdp_buff *xdp)
1610 {
1611     struct ena_rx_buffer *rx_info;
1612     int ret;
1613
1614     rx_info = &rx_ring->rx_buffer_info[rx_ring->ena_bufs[0].req_id];
1615     xdp_prepare_buff(xdp, page_address(rx_info->page),
1616              rx_info->page_offset,
1617              rx_ring->ena_bufs[0].len, false);
1618     /* If for some reason we received a bigger packet than
1619      * we expect, then we simply drop it
1620      */
1621     if (unlikely(rx_ring->ena_bufs[0].len > ENA_XDP_MAX_MTU))
1622         return XDP_DROP;
1623
1624     ret = ena_xdp_execute(rx_ring, xdp);
1625
1626     /* The xdp program might expand the headers */
1627     if (ret == XDP_PASS) {
1628         rx_info->page_offset = xdp->data - xdp->data_hard_start;
1629         rx_ring->ena_bufs[0].len = xdp->data_end - xdp->data;
1630     }
1631
1632     return ret;
1633 }
1634 /* ena_clean_rx_irq - Cleanup RX irq
1635  * @rx_ring: RX ring to clean
1636  * @napi: napi handler
1637  * @budget: how many packets driver is allowed to clean
1638  *
1639  * Returns the number of cleaned buffers.
1640  */
1641 static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
1642                 u32 budget)
1643 {
1644     u16 next_to_clean = rx_ring->next_to_clean;
1645     struct ena_com_rx_ctx ena_rx_ctx;
1646     struct ena_rx_buffer *rx_info;
1647     struct ena_adapter *adapter;
1648     u32 res_budget, work_done;
1649     int rx_copybreak_pkt = 0;
1650     int refill_threshold;
1651     struct sk_buff *skb;
1652     int refill_required;
1653     struct xdp_buff xdp;
1654     int xdp_flags = 0;
1655     int total_len = 0;
1656     int xdp_verdict;
1657     int rc = 0;
1658     int i;
1659
1660     netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1661           "%s qid %d\n", __func__, rx_ring->qid);
1662     res_budget = budget;
1663     xdp_init_buff(&xdp, ENA_PAGE_SIZE, &rx_ring->xdp_rxq);
1664
1665     do {
1666         xdp_verdict = XDP_PASS;
1667         skb = NULL;
1668         ena_rx_ctx.ena_bufs = rx_ring->ena_bufs;
1669         ena_rx_ctx.max_bufs = rx_ring->sgl_size;
1670         ena_rx_ctx.descs = 0;
1671         ena_rx_ctx.pkt_offset = 0;
1672         rc = ena_com_rx_pkt(rx_ring->ena_com_io_cq,
1673                     rx_ring->ena_com_io_sq,
1674                     &ena_rx_ctx);
1675         if (unlikely(rc))
1676             goto error;
1677
1678         if (unlikely(ena_rx_ctx.descs == 0))
1679             break;
1680
1681         /* First descriptor might have an offset set by the device */
1682         rx_info = &rx_ring->rx_buffer_info[rx_ring->ena_bufs[0].req_id];
1683         rx_info->page_offset += ena_rx_ctx.pkt_offset;
1684
1685         netif_dbg(rx_ring->adapter, rx_status, rx_ring->netdev,
1686               "rx_poll: q %d got packet from ena. descs #: %d l3 proto %d l4 proto %d hash: %x\n",
1687               rx_ring->qid, ena_rx_ctx.descs, ena_rx_ctx.l3_proto,
1688               ena_rx_ctx.l4_proto, ena_rx_ctx.hash);
1689
1690         if (ena_xdp_present_ring(rx_ring))
1691             xdp_verdict = ena_xdp_handle_buff(rx_ring, &xdp);
1692
1693         /* allocate skb and fill it */
1694         if (xdp_verdict == XDP_PASS)
1695             skb = ena_rx_skb(rx_ring,
1696                      rx_ring->ena_bufs,
1697                      ena_rx_ctx.descs,
1698                      &next_to_clean);
1699
1700         if (unlikely(!skb)) {
1701             for (i = 0; i < ena_rx_ctx.descs; i++) {
1702                 int req_id = rx_ring->ena_bufs[i].req_id;
1703
1704                 rx_ring->free_ids[next_to_clean] = req_id;
1705                 next_to_clean =
1706                     ENA_RX_RING_IDX_NEXT(next_to_clean,
1707                                  rx_ring->ring_size);
1708
1709                 /* Packets was passed for transmission, unmap it
1710                  * from RX side.
1711                  */
1712                 if (xdp_verdict == XDP_TX || xdp_verdict == XDP_REDIRECT) {
1713                     ena_unmap_rx_buff(rx_ring,
1714                               &rx_ring->rx_buffer_info[req_id]);
1715                     rx_ring->rx_buffer_info[req_id].page = NULL;
1716                 }
1717             }
1718             if (xdp_verdict != XDP_PASS) {
1719                 xdp_flags |= xdp_verdict;
1720                 res_budget--;
1721                 continue;
1722             }
1723             break;
1724         }
1725
1726         ena_rx_checksum(rx_ring, &ena_rx_ctx, skb);
1727
1728         ena_set_rx_hash(rx_ring, &ena_rx_ctx, skb);
1729
1730         skb_record_rx_queue(skb, rx_ring->qid);
1731
1732         if (rx_ring->ena_bufs[0].len <= rx_ring->rx_copybreak)
1733             rx_copybreak_pkt++;
1734
1735         total_len += skb->len;
1736
1737         napi_gro_receive(napi, skb);
1738
1739         res_budget--;
1740     } while (likely(res_budget));
1741
1742     work_done = budget - res_budget;
1743     rx_ring->per_napi_packets += work_done;
1744     u64_stats_update_begin(&rx_ring->syncp);
1745     rx_ring->rx_stats.bytes += total_len;
1746     rx_ring->rx_stats.cnt += work_done;
1747     rx_ring->rx_stats.rx_copybreak_pkt += rx_copybreak_pkt;
1748     u64_stats_update_end(&rx_ring->syncp);
1749
1750     rx_ring->next_to_clean = next_to_clean;
1751
1752     refill_required = ena_com_free_q_entries(rx_ring->ena_com_io_sq);
1753     refill_threshold =
1754         min_t(int, rx_ring->ring_size / ENA_RX_REFILL_THRESH_DIVIDER,
1755               ENA_RX_REFILL_THRESH_PACKET);
1756
1757     /* Optimization, try to batch new rx buffers */
1758     if (refill_required > refill_threshold) {
1759         ena_com_update_dev_comp_head(rx_ring->ena_com_io_cq);
1760         ena_refill_rx_bufs(rx_ring, refill_required);
1761     }
1762
1763     if (xdp_flags & XDP_REDIRECT)
1764         xdp_do_flush_map();
1765
1766     return work_done;
1767
1768 error:
1769     adapter = netdev_priv(rx_ring->netdev);
1770
1771     if (rc == -ENOSPC) {
1772         ena_increase_stat(&rx_ring->rx_stats.bad_desc_num, 1,
1773                   &rx_ring->syncp);
1774         ena_reset_device(adapter, ENA_REGS_RESET_TOO_MANY_RX_DESCS);
1775     } else {
1776         ena_increase_stat(&rx_ring->rx_stats.bad_req_id, 1,
1777                   &rx_ring->syncp);
1778         ena_reset_device(adapter, ENA_REGS_RESET_INV_RX_REQ_ID);
1779     }
1780     return 0;
1781 }
1782
1783 static void ena_dim_work(struct work_struct *w)
1784 {
1785     struct dim *dim = container_of(w, struct dim, work);
1786     struct dim_cq_moder cur_moder =
1787         net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
1788     struct ena_napi *ena_napi = container_of(dim, struct ena_napi, dim);
1789
1790     ena_napi->rx_ring->smoothed_interval = cur_moder.usec;
1791     dim->state = DIM_START_MEASURE;
1792 }
1793
1794 static void ena_adjust_adaptive_rx_intr_moderation(struct ena_napi *ena_napi)
1795 {
1796     struct dim_sample dim_sample;
1797     struct ena_ring *rx_ring = ena_napi->rx_ring;
1798
1799     if (!rx_ring->per_napi_packets)
1800         return;
1801
1802     rx_ring->non_empty_napi_events++;
1803
1804     dim_update_sample(rx_ring->non_empty_napi_events,
1805               rx_ring->rx_stats.cnt,
1806               rx_ring->rx_stats.bytes,
1807               &dim_sample);
1808
1809     net_dim(&ena_napi->dim, dim_sample);
1810
1811     rx_ring->per_napi_packets = 0;
1812 }
1813
1814 static void ena_unmask_interrupt(struct ena_ring *tx_ring,
1815                     struct ena_ring *rx_ring)
1816 {
1817     struct ena_eth_io_intr_reg intr_reg;
1818     u32 rx_interval = 0;
1819     /* Rx ring can be NULL when for XDP tx queues which don't have an
1820      * accompanying rx_ring pair.
1821      */
1822     if (rx_ring)
1823         rx_interval = ena_com_get_adaptive_moderation_enabled(rx_ring->ena_dev) ?
1824             rx_ring->smoothed_interval :
1825             ena_com_get_nonadaptive_moderation_interval_rx(rx_ring->ena_dev);
1826
1827     /* Update intr register: rx intr delay,
1828      * tx intr delay and interrupt unmask
1829      */
1830     ena_com_update_intr_reg(&intr_reg,
1831                 rx_interval,
1832                 tx_ring->smoothed_interval,
1833                 true);
1834
1835     ena_increase_stat(&tx_ring->tx_stats.unmask_interrupt, 1,
1836               &tx_ring->syncp);
1837
1838     /* It is a shared MSI-X.
1839      * Tx and Rx CQ have pointer to it.
1840      * So we use one of them to reach the intr reg
1841      * The Tx ring is used because the rx_ring is NULL for XDP queues
1842      */
1843     ena_com_unmask_intr(tx_ring->ena_com_io_cq, &intr_reg);
1844 }
1845
1846 static void ena_update_ring_numa_node(struct ena_ring *tx_ring,
1847                          struct ena_ring *rx_ring)
1848 {
1849     int cpu = get_cpu();
1850     int numa_node;
1851
1852     /* Check only one ring since the 2 rings are running on the same cpu */
1853     if (likely(tx_ring->cpu == cpu))
1854         goto out;
1855
1856     numa_node = cpu_to_node(cpu);
1857     put_cpu();
1858
1859     if (numa_node != NUMA_NO_NODE) {
1860         ena_com_update_numa_node(tx_ring->ena_com_io_cq, numa_node);
1861         if (rx_ring)
1862             ena_com_update_numa_node(rx_ring->ena_com_io_cq,
1863                          numa_node);
1864     }
1865
1866     tx_ring->cpu = cpu;
1867     if (rx_ring)
1868         rx_ring->cpu = cpu;
1869
1870     return;
1871 out:
1872     put_cpu();
1873 }
1874
1875 static int ena_clean_xdp_irq(struct ena_ring *xdp_ring, u32 budget)
1876 {
1877     u32 total_done = 0;
1878     u16 next_to_clean;
1879     u32 tx_bytes = 0;
1880     int tx_pkts = 0;
1881     u16 req_id;
1882     int rc;
1883
1884     if (unlikely(!xdp_ring))
1885         return 0;
1886     next_to_clean = xdp_ring->next_to_clean;
1887
1888     while (tx_pkts < budget) {
1889         struct ena_tx_buffer *tx_info;
1890         struct xdp_frame *xdpf;
1891
1892         rc = ena_com_tx_comp_req_id_get(xdp_ring->ena_com_io_cq,
1893                         &req_id);
1894         if (rc) {
1895             if (unlikely(rc == -EINVAL))
1896                 handle_invalid_req_id(xdp_ring, req_id, NULL,
1897                               true);
1898             break;
1899         }
1900
1901         /* validate that the request id points to a valid xdp_frame */
1902         rc = validate_xdp_req_id(xdp_ring, req_id);
1903         if (rc)
1904             break;
1905
1906         tx_info = &xdp_ring->tx_buffer_info[req_id];
1907         xdpf = tx_info->xdpf;
1908
1909         tx_info->xdpf = NULL;
1910         tx_info->last_jiffies = 0;
1911         ena_unmap_tx_buff(xdp_ring, tx_info);
1912
1913         netif_dbg(xdp_ring->adapter, tx_done, xdp_ring->netdev,
1914               "tx_poll: q %d skb %p completed\n", xdp_ring->qid,
1915               xdpf);
1916
1917         tx_bytes += xdpf->len;
1918         tx_pkts++;
1919         total_done += tx_info->tx_descs;
1920
1921         xdp_return_frame(xdpf);
1922         xdp_ring->free_ids[next_to_clean] = req_id;
1923         next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean,
1924                              xdp_ring->ring_size);
1925     }
1926
1927     xdp_ring->next_to_clean = next_to_clean;
1928     ena_com_comp_ack(xdp_ring->ena_com_io_sq, total_done);
1929     ena_com_update_dev_comp_head(xdp_ring->ena_com_io_cq);
1930
1931     netif_dbg(xdp_ring->adapter, tx_done, xdp_ring->netdev,
1932           "tx_poll: q %d done. total pkts: %d\n",
1933           xdp_ring->qid, tx_pkts);
1934
1935     return tx_pkts;
1936 }
1937
1938 static int ena_io_poll(struct napi_struct *napi, int budget)
1939 {
1940     struct ena_napi *ena_napi = container_of(napi, struct ena_napi, napi);
1941     struct ena_ring *tx_ring, *rx_ring;
1942     int tx_work_done;
1943     int rx_work_done = 0;
1944     int tx_budget;
1945     int napi_comp_call = 0;
1946     int ret;
1947
1948     tx_ring = ena_napi->tx_ring;
1949     rx_ring = ena_napi->rx_ring;
1950
1951     tx_budget = tx_ring->ring_size / ENA_TX_POLL_BUDGET_DIVIDER;
1952
1953     if (!test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags) ||
1954         test_bit(ENA_FLAG_TRIGGER_RESET, &tx_ring->adapter->flags)) {
1955         napi_complete_done(napi, 0);
1956         return 0;
1957     }
1958
1959     tx_work_done = ena_clean_tx_irq(tx_ring, tx_budget);
1960     /* On netpoll the budget is zero and the handler should only clean the
1961      * tx completions.
1962      */
1963     if (likely(budget))
1964         rx_work_done = ena_clean_rx_irq(rx_ring, napi, budget);
1965
1966     /* If the device is about to reset or down, avoid unmask
1967      * the interrupt and return 0 so NAPI won't reschedule
1968      */
1969     if (unlikely(!test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags) ||
1970              test_bit(ENA_FLAG_TRIGGER_RESET, &tx_ring->adapter->flags))) {
1971         napi_complete_done(napi, 0);
1972         ret = 0;
1973
1974     } else if ((budget > rx_work_done) && (tx_budget > tx_work_done)) {
1975         napi_comp_call = 1;
1976
1977         /* Update numa and unmask the interrupt only when schedule
1978          * from the interrupt context (vs from sk_busy_loop)
1979          */
1980         if (napi_complete_done(napi, rx_work_done) &&
1981             READ_ONCE(ena_napi->interrupts_masked)) {
1982             smp_rmb(); /* make sure interrupts_masked is read */
1983             WRITE_ONCE(ena_napi->interrupts_masked, false);
1984             /* We apply adaptive moderation on Rx path only.
1985              * Tx uses static interrupt moderation.
1986              */
1987             if (ena_com_get_adaptive_moderation_enabled(rx_ring->ena_dev))
1988                 ena_adjust_adaptive_rx_intr_moderation(ena_napi);
1989
1990             ena_unmask_interrupt(tx_ring, rx_ring);
1991         }
1992
1993         ena_update_ring_numa_node(tx_ring, rx_ring);
1994
1995         ret = rx_work_done;
1996     } else {
1997         ret = budget;
1998     }
1999
2000     u64_stats_update_begin(&tx_ring->syncp);
2001     tx_ring->tx_stats.napi_comp += napi_comp_call;
2002     tx_ring->tx_stats.tx_poll++;
2003     u64_stats_update_end(&tx_ring->syncp);
2004
2005     tx_ring->tx_stats.last_napi_jiffies = jiffies;
2006
2007     return ret;
2008 }
2009
2010 static irqreturn_t ena_intr_msix_mgmnt(int irq, void *data)
2011 {
2012     struct ena_adapter *adapter = (struct ena_adapter *)data;
2013
2014     ena_com_admin_q_comp_intr_handler(adapter->ena_dev);
2015
2016     /* Don't call the aenq handler before probe is done */
2017     if (likely(test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags)))
2018         ena_com_aenq_intr_handler(adapter->ena_dev, data);
2019
2020     return IRQ_HANDLED;
2021 }
2022
2023 /* ena_intr_msix_io - MSI-X Interrupt Handler for Tx/Rx
2024  * @irq: interrupt number
2025  * @data: pointer to a network interface private napi device structure
2026  */
2027 static irqreturn_t ena_intr_msix_io(int irq, void *data)
2028 {
2029     struct ena_napi *ena_napi = data;
2030
2031     /* Used to check HW health */
2032     WRITE_ONCE(ena_napi->first_interrupt, true);
2033
2034     WRITE_ONCE(ena_napi->interrupts_masked, true);
2035     smp_wmb(); /* write interrupts_masked before calling napi */
2036
2037     napi_schedule_irqoff(&ena_napi->napi);
2038
2039     return IRQ_HANDLED;
2040 }
2041
2042 /* Reserve a single MSI-X vector for management (admin + aenq).
2043  * plus reserve one vector for each potential io queue.
2044  * the number of potential io queues is the minimum of what the device
2045  * supports and the number of vCPUs.
2046  */
2047 static int ena_enable_msix(struct ena_adapter *adapter)
2048 {
2049     int msix_vecs, irq_cnt;
2050
2051     if (test_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags)) {
2052         netif_err(adapter, probe, adapter->netdev,
2053               "Error, MSI-X is already enabled\n");
2054         return -EPERM;
2055     }
2056
2057     /* Reserved the max msix vectors we might need */
2058     msix_vecs = ENA_MAX_MSIX_VEC(adapter->max_num_io_queues);
2059     netif_dbg(adapter, probe, adapter->netdev,
2060           "Trying to enable MSI-X, vectors %d\n", msix_vecs);
2061
2062     irq_cnt = pci_alloc_irq_vectors(adapter->pdev, ENA_MIN_MSIX_VEC,
2063                     msix_vecs, PCI_IRQ_MSIX);
2064
2065     if (irq_cnt < 0) {
2066         netif_err(adapter, probe, adapter->netdev,
2067               "Failed to enable MSI-X. irq_cnt %d\n", irq_cnt);
2068         return -ENOSPC;
2069     }
2070
2071     if (irq_cnt != msix_vecs) {
2072         netif_notice(adapter, probe, adapter->netdev,
2073                  "Enable only %d MSI-X (out of %d), reduce the number of queues\n",
2074                  irq_cnt, msix_vecs);
2075         adapter->num_io_queues = irq_cnt - ENA_ADMIN_MSIX_VEC;
2076     }
2077
2078     if (ena_init_rx_cpu_rmap(adapter))
2079         netif_warn(adapter, probe, adapter->netdev,
2080                "Failed to map IRQs to CPUs\n");
2081
2082     adapter->msix_vecs = irq_cnt;
2083     set_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags);
2084
2085     return 0;
2086 }
2087
2088 static void ena_setup_mgmnt_intr(struct ena_adapter *adapter)
2089 {
2090     u32 cpu;
2091
2092     snprintf(adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].name,
2093          ENA_IRQNAME_SIZE, "ena-mgmnt@pci:%s",
2094          pci_name(adapter->pdev));
2095     adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].handler =
2096         ena_intr_msix_mgmnt;
2097     adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].data = adapter;
2098     adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].vector =
2099         pci_irq_vector(adapter->pdev, ENA_MGMNT_IRQ_IDX);
2100     cpu = cpumask_first(cpu_online_mask);
2101     adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].cpu = cpu;
2102     cpumask_set_cpu(cpu,
2103             &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX].affinity_hint_mask);
2104 }
2105
2106 static void ena_setup_io_intr(struct ena_adapter *adapter)
2107 {
2108     struct net_device *netdev;
2109     int irq_idx, i, cpu;
2110     int io_queue_count;
2111
2112     netdev = adapter->netdev;
2113     io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2114
2115     for (i = 0; i < io_queue_count; i++) {
2116         irq_idx = ENA_IO_IRQ_IDX(i);
2117         cpu = i % num_online_cpus();
2118
2119         snprintf(adapter->irq_tbl[irq_idx].name, ENA_IRQNAME_SIZE,
2120              "%s-Tx-Rx-%d", netdev->name, i);
2121         adapter->irq_tbl[irq_idx].handler = ena_intr_msix_io;
2122         adapter->irq_tbl[irq_idx].data = &adapter->ena_napi[i];
2123         adapter->irq_tbl[irq_idx].vector =
2124             pci_irq_vector(adapter->pdev, irq_idx);
2125         adapter->irq_tbl[irq_idx].cpu = cpu;
2126
2127         cpumask_set_cpu(cpu,
2128                 &adapter->irq_tbl[irq_idx].affinity_hint_mask);
2129     }
2130 }
2131
2132 static int ena_request_mgmnt_irq(struct ena_adapter *adapter)
2133 {
2134     unsigned long flags = 0;
2135     struct ena_irq *irq;
2136     int rc;
2137
2138     irq = &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX];
2139     rc = request_irq(irq->vector, irq->handler, flags, irq->name,
2140              irq->data);
2141     if (rc) {
2142         netif_err(adapter, probe, adapter->netdev,
2143               "Failed to request admin irq\n");
2144         return rc;
2145     }
2146
2147     netif_dbg(adapter, probe, adapter->netdev,
2148           "Set affinity hint of mgmnt irq.to 0x%lx (irq vector: %d)\n",
2149           irq->affinity_hint_mask.bits[0], irq->vector);
2150
2151     irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
2152
2153     return rc;
2154 }
2155
2156 static int ena_request_io_irq(struct ena_adapter *adapter)
2157 {
2158     u32 io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2159     unsigned long flags = 0;
2160     struct ena_irq *irq;
2161     int rc = 0, i, k;
2162
2163     if (!test_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags)) {
2164         netif_err(adapter, ifup, adapter->netdev,
2165               "Failed to request I/O IRQ: MSI-X is not enabled\n");
2166         return -EINVAL;
2167     }
2168
2169     for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++) {
2170         irq = &adapter->irq_tbl[i];
2171         rc = request_irq(irq->vector, irq->handler, flags, irq->name,
2172                  irq->data);
2173         if (rc) {
2174             netif_err(adapter, ifup, adapter->netdev,
2175                   "Failed to request I/O IRQ. index %d rc %d\n",
2176                    i, rc);
2177             goto err;
2178         }
2179
2180         netif_dbg(adapter, ifup, adapter->netdev,
2181               "Set affinity hint of irq. index %d to 0x%lx (irq vector: %d)\n",
2182               i, irq->affinity_hint_mask.bits[0], irq->vector);
2183
2184         irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
2185     }
2186
2187     return rc;
2188
2189 err:
2190     for (k = ENA_IO_IRQ_FIRST_IDX; k < i; k++) {
2191         irq = &adapter->irq_tbl[k];
2192         free_irq(irq->vector, irq->data);
2193     }
2194
2195     return rc;
2196 }
2197
2198 static void ena_free_mgmnt_irq(struct ena_adapter *adapter)
2199 {
2200     struct ena_irq *irq;
2201
2202     irq = &adapter->irq_tbl[ENA_MGMNT_IRQ_IDX];
2203     synchronize_irq(irq->vector);
2204     irq_set_affinity_hint(irq->vector, NULL);
2205     free_irq(irq->vector, irq->data);
2206 }
2207
2208 static void ena_free_io_irq(struct ena_adapter *adapter)
2209 {
2210     u32 io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2211     struct ena_irq *irq;
2212     int i;
2213
2214 #ifdef CONFIG_RFS_ACCEL
2215     if (adapter->msix_vecs >= 1) {
2216         free_irq_cpu_rmap(adapter->netdev->rx_cpu_rmap);
2217         adapter->netdev->rx_cpu_rmap = NULL;
2218     }
2219 #endif /* CONFIG_RFS_ACCEL */
2220
2221     for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++) {
2222         irq = &adapter->irq_tbl[i];
2223         irq_set_affinity_hint(irq->vector, NULL);
2224         free_irq(irq->vector, irq->data);
2225     }
2226 }
2227
2228 static void ena_disable_msix(struct ena_adapter *adapter)
2229 {
2230     if (test_and_clear_bit(ENA_FLAG_MSIX_ENABLED, &adapter->flags))
2231         pci_free_irq_vectors(adapter->pdev);
2232 }
2233
2234 static void ena_disable_io_intr_sync(struct ena_adapter *adapter)
2235 {
2236     u32 io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2237     int i;
2238
2239     if (!netif_running(adapter->netdev))
2240         return;
2241
2242     for (i = ENA_IO_IRQ_FIRST_IDX; i < ENA_MAX_MSIX_VEC(io_queue_count); i++)
2243         synchronize_irq(adapter->irq_tbl[i].vector);
2244 }
2245
2246 static void ena_del_napi_in_range(struct ena_adapter *adapter,
2247                   int first_index,
2248                   int count)
2249 {
2250     int i;
2251
2252     for (i = first_index; i < first_index + count; i++) {
2253         netif_napi_del(&adapter->ena_napi[i].napi);
2254
2255         WARN_ON(!ENA_IS_XDP_INDEX(adapter, i) &&
2256             adapter->ena_napi[i].xdp_ring);
2257     }
2258 }
2259
2260 static void ena_init_napi_in_range(struct ena_adapter *adapter,
2261                    int first_index, int count)
2262 {
2263     int i;
2264
2265     for (i = first_index; i < first_index + count; i++) {
2266         struct ena_napi *napi = &adapter->ena_napi[i];
2267
2268         netif_napi_add(adapter->netdev,
2269                    &napi->napi,
2270                    ENA_IS_XDP_INDEX(adapter, i) ? ena_xdp_io_poll : ena_io_poll,
2271                    NAPI_POLL_WEIGHT);
2272
2273         if (!ENA_IS_XDP_INDEX(adapter, i)) {
2274             napi->rx_ring = &adapter->rx_ring[i];
2275             napi->tx_ring = &adapter->tx_ring[i];
2276         } else {
2277             napi->xdp_ring = &adapter->tx_ring[i];
2278         }
2279         napi->qid = i;
2280     }
2281 }
2282
2283 static void ena_napi_disable_in_range(struct ena_adapter *adapter,
2284                       int first_index,
2285                       int count)
2286 {
2287     int i;
2288
2289     for (i = first_index; i < first_index + count; i++)
2290         napi_disable(&adapter->ena_napi[i].napi);
2291 }
2292
2293 static void ena_napi_enable_in_range(struct ena_adapter *adapter,
2294                      int first_index,
2295                      int count)
2296 {
2297     int i;
2298
2299     for (i = first_index; i < first_index + count; i++)
2300         napi_enable(&adapter->ena_napi[i].napi);
2301 }
2302
2303 /* Configure the Rx forwarding */
2304 static int ena_rss_configure(struct ena_adapter *adapter)
2305 {
2306     struct ena_com_dev *ena_dev = adapter->ena_dev;
2307     int rc;
2308
2309     /* In case the RSS table wasn't initialized by probe */
2310     if (!ena_dev->rss.tbl_log_size) {
2311         rc = ena_rss_init_default(adapter);
2312         if (rc && (rc != -EOPNOTSUPP)) {
2313             netif_err(adapter, ifup, adapter->netdev,
2314                   "Failed to init RSS rc: %d\n", rc);
2315             return rc;
2316         }
2317     }
2318
2319     /* Set indirect table */
2320     rc = ena_com_indirect_table_set(ena_dev);
2321     if (unlikely(rc && rc != -EOPNOTSUPP))
2322         return rc;
2323
2324     /* Configure hash function (if supported) */
2325     rc = ena_com_set_hash_function(ena_dev);
2326     if (unlikely(rc && (rc != -EOPNOTSUPP)))
2327         return rc;
2328
2329     /* Configure hash inputs (if supported) */
2330     rc = ena_com_set_hash_ctrl(ena_dev);
2331     if (unlikely(rc && (rc != -EOPNOTSUPP)))
2332         return rc;
2333
2334     return 0;
2335 }
2336
2337 static int ena_up_complete(struct ena_adapter *adapter)
2338 {
2339     int rc;
2340
2341     rc = ena_rss_configure(adapter);
2342     if (rc)
2343         return rc;
2344
2345     ena_change_mtu(adapter->netdev, adapter->netdev->mtu);
2346
2347     ena_refill_all_rx_bufs(adapter);
2348
2349     /* enable transmits */
2350     netif_tx_start_all_queues(adapter->netdev);
2351
2352     ena_napi_enable_in_range(adapter,
2353                  0,
2354                  adapter->xdp_num_queues + adapter->num_io_queues);
2355
2356     return 0;
2357 }
2358
2359 static int ena_create_io_tx_queue(struct ena_adapter *adapter, int qid)
2360 {
2361     struct ena_com_create_io_ctx ctx;
2362     struct ena_com_dev *ena_dev;
2363     struct ena_ring *tx_ring;
2364     u32 msix_vector;
2365     u16 ena_qid;
2366     int rc;
2367
2368     ena_dev = adapter->ena_dev;
2369
2370     tx_ring = &adapter->tx_ring[qid];
2371     msix_vector = ENA_IO_IRQ_IDX(qid);
2372     ena_qid = ENA_IO_TXQ_IDX(qid);
2373
2374     memset(&ctx, 0x0, sizeof(ctx));
2375
2376     ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_TX;
2377     ctx.qid = ena_qid;
2378     ctx.mem_queue_type = ena_dev->tx_mem_queue_type;
2379     ctx.msix_vector = msix_vector;
2380     ctx.queue_size = tx_ring->ring_size;
2381     ctx.numa_node = cpu_to_node(tx_ring->cpu);
2382
2383     rc = ena_com_create_io_queue(ena_dev, &ctx);
2384     if (rc) {
2385         netif_err(adapter, ifup, adapter->netdev,
2386               "Failed to create I/O TX queue num %d rc: %d\n",
2387               qid, rc);
2388         return rc;
2389     }
2390
2391     rc = ena_com_get_io_handlers(ena_dev, ena_qid,
2392                      &tx_ring->ena_com_io_sq,
2393                      &tx_ring->ena_com_io_cq);
2394     if (rc) {
2395         netif_err(adapter, ifup, adapter->netdev,
2396               "Failed to get TX queue handlers. TX queue num %d rc: %d\n",
2397               qid, rc);
2398         ena_com_destroy_io_queue(ena_dev, ena_qid);
2399         return rc;
2400     }
2401
2402     ena_com_update_numa_node(tx_ring->ena_com_io_cq, ctx.numa_node);
2403     return rc;
2404 }
2405
2406 static int ena_create_io_tx_queues_in_range(struct ena_adapter *adapter,
2407                         int first_index, int count)
2408 {
2409     struct ena_com_dev *ena_dev = adapter->ena_dev;
2410     int rc, i;
2411
2412     for (i = first_index; i < first_index + count; i++) {
2413         rc = ena_create_io_tx_queue(adapter, i);
2414         if (rc)
2415             goto create_err;
2416     }
2417
2418     return 0;
2419
2420 create_err:
2421     while (i-- > first_index)
2422         ena_com_destroy_io_queue(ena_dev, ENA_IO_TXQ_IDX(i));
2423
2424     return rc;
2425 }
2426
2427 static int ena_create_io_rx_queue(struct ena_adapter *adapter, int qid)
2428 {
2429     struct ena_com_dev *ena_dev;
2430     struct ena_com_create_io_ctx ctx;
2431     struct ena_ring *rx_ring;
2432     u32 msix_vector;
2433     u16 ena_qid;
2434     int rc;
2435
2436     ena_dev = adapter->ena_dev;
2437
2438     rx_ring = &adapter->rx_ring[qid];
2439     msix_vector = ENA_IO_IRQ_IDX(qid);
2440     ena_qid = ENA_IO_RXQ_IDX(qid);
2441
2442     memset(&ctx, 0x0, sizeof(ctx));
2443
2444     ctx.qid = ena_qid;
2445     ctx.direction = ENA_COM_IO_QUEUE_DIRECTION_RX;
2446     ctx.mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
2447     ctx.msix_vector = msix_vector;
2448     ctx.queue_size = rx_ring->ring_size;
2449     ctx.numa_node = cpu_to_node(rx_ring->cpu);
2450
2451     rc = ena_com_create_io_queue(ena_dev, &ctx);
2452     if (rc) {
2453         netif_err(adapter, ifup, adapter->netdev,
2454               "Failed to create I/O RX queue num %d rc: %d\n",
2455               qid, rc);
2456         return rc;
2457     }
2458
2459     rc = ena_com_get_io_handlers(ena_dev, ena_qid,
2460                      &rx_ring->ena_com_io_sq,
2461                      &rx_ring->ena_com_io_cq);
2462     if (rc) {
2463         netif_err(adapter, ifup, adapter->netdev,
2464               "Failed to get RX queue handlers. RX queue num %d rc: %d\n",
2465               qid, rc);
2466         goto err;
2467     }
2468
2469     ena_com_update_numa_node(rx_ring->ena_com_io_cq, ctx.numa_node);
2470
2471     return rc;
2472 err:
2473     ena_com_destroy_io_queue(ena_dev, ena_qid);
2474     return rc;
2475 }
2476
2477 static int ena_create_all_io_rx_queues(struct ena_adapter *adapter)
2478 {
2479     struct ena_com_dev *ena_dev = adapter->ena_dev;
2480     int rc, i;
2481
2482     for (i = 0; i < adapter->num_io_queues; i++) {
2483         rc = ena_create_io_rx_queue(adapter, i);
2484         if (rc)
2485             goto create_err;
2486         INIT_WORK(&adapter->ena_napi[i].dim.work, ena_dim_work);
2487     }
2488
2489     return 0;
2490
2491 create_err:
2492     while (i--) {
2493         cancel_work_sync(&adapter->ena_napi[i].dim.work);
2494         ena_com_destroy_io_queue(ena_dev, ENA_IO_RXQ_IDX(i));
2495     }
2496
2497     return rc;
2498 }
2499
2500 static void set_io_rings_size(struct ena_adapter *adapter,
2501                   int new_tx_size,
2502                   int new_rx_size)
2503 {
2504     int i;
2505
2506     for (i = 0; i < adapter->num_io_queues; i++) {
2507         adapter->tx_ring[i].ring_size = new_tx_size;
2508         adapter->rx_ring[i].ring_size = new_rx_size;
2509     }
2510 }
2511
2512 /* This function allows queue allocation to backoff when the system is
2513  * low on memory. If there is not enough memory to allocate io queues
2514  * the driver will try to allocate smaller queues.
2515  *
2516  * The backoff algorithm is as follows:
2517  *  1. Try to allocate TX and RX and if successful.
2518  *  1.1. return success
2519  *
2520  *  2. Divide by 2 the size of the larger of RX and TX queues (or both if their size is the same).
2521  *
2522  *  3. If TX or RX is smaller than 256
2523  *  3.1. return failure.
2524  *  4. else
2525  *  4.1. go back to 1.
2526  */
2527 static int create_queues_with_size_backoff(struct ena_adapter *adapter)
2528 {
2529     int rc, cur_rx_ring_size, cur_tx_ring_size;
2530     int new_rx_ring_size, new_tx_ring_size;
2531
2532     /* current queue sizes might be set to smaller than the requested
2533      * ones due to past queue allocation failures.
2534      */
2535     set_io_rings_size(adapter, adapter->requested_tx_ring_size,
2536               adapter->requested_rx_ring_size);
2537
2538     while (1) {
2539         if (ena_xdp_present(adapter)) {
2540             rc = ena_setup_and_create_all_xdp_queues(adapter);
2541
2542             if (rc)
2543                 goto err_setup_tx;
2544         }
2545         rc = ena_setup_tx_resources_in_range(adapter,
2546                              0,
2547                              adapter->num_io_queues);
2548         if (rc)
2549             goto err_setup_tx;
2550
2551         rc = ena_create_io_tx_queues_in_range(adapter,
2552                               0,
2553                               adapter->num_io_queues);
2554         if (rc)
2555             goto err_create_tx_queues;
2556
2557         rc = ena_setup_all_rx_resources(adapter);
2558         if (rc)
2559             goto err_setup_rx;
2560
2561         rc = ena_create_all_io_rx_queues(adapter);
2562         if (rc)
2563             goto err_create_rx_queues;
2564
2565         return 0;
2566
2567 err_create_rx_queues:
2568         ena_free_all_io_rx_resources(adapter);
2569 err_setup_rx:
2570         ena_destroy_all_tx_queues(adapter);
2571 err_create_tx_queues:
2572         ena_free_all_io_tx_resources(adapter);
2573 err_setup_tx:
2574         if (rc != -ENOMEM) {
2575             netif_err(adapter, ifup, adapter->netdev,
2576                   "Queue creation failed with error code %d\n",
2577                   rc);
2578             return rc;
2579         }
2580
2581         cur_tx_ring_size = adapter->tx_ring[0].ring_size;
2582         cur_rx_ring_size = adapter->rx_ring[0].ring_size;
2583
2584         netif_err(adapter, ifup, adapter->netdev,
2585               "Not enough memory to create queues with sizes TX=%d, RX=%d\n",
2586               cur_tx_ring_size, cur_rx_ring_size);
2587
2588         new_tx_ring_size = cur_tx_ring_size;
2589         new_rx_ring_size = cur_rx_ring_size;
2590
2591         /* Decrease the size of the larger queue, or
2592          * decrease both if they are the same size.
2593          */
2594         if (cur_rx_ring_size <= cur_tx_ring_size)
2595             new_tx_ring_size = cur_tx_ring_size / 2;
2596         if (cur_rx_ring_size >= cur_tx_ring_size)
2597             new_rx_ring_size = cur_rx_ring_size / 2;
2598
2599         if (new_tx_ring_size < ENA_MIN_RING_SIZE ||
2600             new_rx_ring_size < ENA_MIN_RING_SIZE) {
2601             netif_err(adapter, ifup, adapter->netdev,
2602                   "Queue creation failed with the smallest possible queue size of %d for both queues. Not retrying with smaller queues\n",
2603                   ENA_MIN_RING_SIZE);
2604             return rc;
2605         }
2606
2607         netif_err(adapter, ifup, adapter->netdev,
2608               "Retrying queue creation with sizes TX=%d, RX=%d\n",
2609               new_tx_ring_size,
2610               new_rx_ring_size);
2611
2612         set_io_rings_size(adapter, new_tx_ring_size,
2613                   new_rx_ring_size);
2614     }
2615 }
2616
2617 static int ena_up(struct ena_adapter *adapter)
2618 {
2619     int io_queue_count, rc, i;
2620
2621     netif_dbg(adapter, ifup, adapter->netdev, "%s\n", __func__);
2622
2623     io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2624     ena_setup_io_intr(adapter);
2625
2626     /* napi poll functions should be initialized before running
2627      * request_irq(), to handle a rare condition where there is a pending
2628      * interrupt, causing the ISR to fire immediately while the poll
2629      * function wasn't set yet, causing a null dereference
2630      */
2631     ena_init_napi_in_range(adapter, 0, io_queue_count);
2632
2633     rc = ena_request_io_irq(adapter);
2634     if (rc)
2635         goto err_req_irq;
2636
2637     rc = create_queues_with_size_backoff(adapter);
2638     if (rc)
2639         goto err_create_queues_with_backoff;
2640
2641     rc = ena_up_complete(adapter);
2642     if (rc)
2643         goto err_up;
2644
2645     if (test_bit(ENA_FLAG_LINK_UP, &adapter->flags))
2646         netif_carrier_on(adapter->netdev);
2647
2648     ena_increase_stat(&adapter->dev_stats.interface_up, 1,
2649               &adapter->syncp);
2650
2651     set_bit(ENA_FLAG_DEV_UP, &adapter->flags);
2652
2653     /* Enable completion queues interrupt */
2654     for (i = 0; i < adapter->num_io_queues; i++)
2655         ena_unmask_interrupt(&adapter->tx_ring[i],
2656                      &adapter->rx_ring[i]);
2657
2658     /* schedule napi in case we had pending packets
2659      * from the last time we disable napi
2660      */
2661     for (i = 0; i < io_queue_count; i++)
2662         napi_schedule(&adapter->ena_napi[i].napi);
2663
2664     return rc;
2665
2666 err_up:
2667     ena_destroy_all_tx_queues(adapter);
2668     ena_free_all_io_tx_resources(adapter);
2669     ena_destroy_all_rx_queues(adapter);
2670     ena_free_all_io_rx_resources(adapter);
2671 err_create_queues_with_backoff:
2672     ena_free_io_irq(adapter);
2673 err_req_irq:
2674     ena_del_napi_in_range(adapter, 0, io_queue_count);
2675
2676     return rc;
2677 }
2678
2679 static void ena_down(struct ena_adapter *adapter)
2680 {
2681     int io_queue_count = adapter->num_io_queues + adapter->xdp_num_queues;
2682
2683     netif_info(adapter, ifdown, adapter->netdev, "%s\n", __func__);
2684
2685     clear_bit(ENA_FLAG_DEV_UP, &adapter->flags);
2686
2687     ena_increase_stat(&adapter->dev_stats.interface_down, 1,
2688               &adapter->syncp);
2689
2690     netif_carrier_off(adapter->netdev);
2691     netif_tx_disable(adapter->netdev);
2692
2693     /* After this point the napi handler won't enable the tx queue */
2694     ena_napi_disable_in_range(adapter, 0, io_queue_count);
2695
2696     /* After destroy the queue there won't be any new interrupts */
2697
2698     if (test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags)) {
2699         int rc;
2700
2701         rc = ena_com_dev_reset(adapter->ena_dev, adapter->reset_reason);
2702         if (rc)
2703             netif_err(adapter, ifdown, adapter->netdev,
2704                   "Device reset failed\n");
2705         /* stop submitting admin commands on a device that was reset */
2706         ena_com_set_admin_running_state(adapter->ena_dev, false);
2707     }
2708
2709     ena_destroy_all_io_queues(adapter);
2710
2711     ena_disable_io_intr_sync(adapter);
2712     ena_free_io_irq(adapter);
2713     ena_del_napi_in_range(adapter, 0, io_queue_count);
2714
2715     ena_free_all_tx_bufs(adapter);
2716     ena_free_all_rx_bufs(adapter);
2717     ena_free_all_io_tx_resources(adapter);
2718     ena_free_all_io_rx_resources(adapter);
2719 }
2720
2721 /* ena_open - Called when a network interface is made active
2722  * @netdev: network interface device structure
2723  *
2724  * Returns 0 on success, negative value on failure
2725  *
2726  * The open entry point is called when a network interface is made
2727  * active by the system (IFF_UP).  At this point all resources needed
2728  * for transmit and receive operations are allocated, the interrupt
2729  * handler is registered with the OS, the watchdog timer is started,
2730  * and the stack is notified that the interface is ready.
2731  */
2732 static int ena_open(struct net_device *netdev)
2733 {
2734     struct ena_adapter *adapter = netdev_priv(netdev);
2735     int rc;
2736
2737     /* Notify the stack of the actual queue counts. */
2738     rc = netif_set_real_num_tx_queues(netdev, adapter->num_io_queues);
2739     if (rc) {
2740         netif_err(adapter, ifup, netdev, "Can't set num tx queues\n");
2741         return rc;
2742     }
2743
2744     rc = netif_set_real_num_rx_queues(netdev, adapter->num_io_queues);
2745     if (rc) {
2746         netif_err(adapter, ifup, netdev, "Can't set num rx queues\n");
2747         return rc;
2748     }
2749
2750     rc = ena_up(adapter);
2751     if (rc)
2752         return rc;
2753
2754     return rc;
2755 }
2756
2757 /* ena_close - Disables a network interface
2758  * @netdev: network interface device structure
2759  *
2760  * Returns 0, this is not allowed to fail
2761  *
2762  * The close entry point is called when an interface is de-activated
2763  * by the OS.  The hardware is still under the drivers control, but
2764  * needs to be disabled.  A global MAC reset is issued to stop the
2765  * hardware, and all transmit and receive resources are freed.
2766  */
2767 static int ena_close(struct net_device *netdev)
2768 {
2769     struct ena_adapter *adapter = netdev_priv(netdev);
2770
2771     netif_dbg(adapter, ifdown, netdev, "%s\n", __func__);
2772
2773     if (!test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
2774         return 0;
2775
2776     if (test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
2777         ena_down(adapter);
2778
2779     /* Check for device status and issue reset if needed*/
2780     check_for_admin_com_state(adapter);
2781     if (unlikely(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
2782         netif_err(adapter, ifdown, adapter->netdev,
2783               "Destroy failure, restarting device\n");
2784         ena_dump_stats_to_dmesg(adapter);
2785         /* rtnl lock already obtained in dev_ioctl() layer */
2786         ena_destroy_device(adapter, false);
2787         ena_restore_device(adapter);
2788     }
2789
2790     return 0;
2791 }
2792
2793 int ena_update_queue_sizes(struct ena_adapter *adapter,
2794                u32 new_tx_size,
2795                u32 new_rx_size)
2796 {
2797     bool dev_was_up;
2798
2799     dev_was_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
2800     ena_close(adapter->netdev);
2801     adapter->requested_tx_ring_size = new_tx_size;
2802     adapter->requested_rx_ring_size = new_rx_size;
2803     ena_init_io_rings(adapter,
2804               0,
2805               adapter->xdp_num_queues +
2806               adapter->num_io_queues);
2807     return dev_was_up ? ena_up(adapter) : 0;
2808 }
2809
2810 int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count)
2811 {
2812     struct ena_com_dev *ena_dev = adapter->ena_dev;
2813     int prev_channel_count;
2814     bool dev_was_up;
2815
2816     dev_was_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
2817     ena_close(adapter->netdev);
2818     prev_channel_count = adapter->num_io_queues;
2819     adapter->num_io_queues = new_channel_count;
2820     if (ena_xdp_present(adapter) &&
2821         ena_xdp_allowed(adapter) == ENA_XDP_ALLOWED) {
2822         adapter->xdp_first_ring = new_channel_count;
2823         adapter->xdp_num_queues = new_channel_count;
2824         if (prev_channel_count > new_channel_count)
2825             ena_xdp_exchange_program_rx_in_range(adapter,
2826                                  NULL,
2827                                  new_channel_count,
2828                                  prev_channel_count);
2829         else
2830             ena_xdp_exchange_program_rx_in_range(adapter,
2831                                  adapter->xdp_bpf_prog,
2832                                  prev_channel_count,
2833                                  new_channel_count);
2834     }
2835
2836     /* We need to destroy the rss table so that the indirection
2837      * table will be reinitialized by ena_up()
2838      */
2839     ena_com_rss_destroy(ena_dev);
2840     ena_init_io_rings(adapter,
2841               0,
2842               adapter->xdp_num_queues +
2843               adapter->num_io_queues);
2844     return dev_was_up ? ena_open(adapter->netdev) : 0;
2845 }
2846
2847 static void ena_tx_csum(struct ena_com_tx_ctx *ena_tx_ctx,
2848             struct sk_buff *skb,
2849             bool disable_meta_caching)
2850 {
2851     u32 mss = skb_shinfo(skb)->gso_size;
2852     struct ena_com_tx_meta *ena_meta = &ena_tx_ctx->ena_meta;
2853     u8 l4_protocol = 0;
2854
2855     if ((skb->ip_summed == CHECKSUM_PARTIAL) || mss) {
2856         ena_tx_ctx->l4_csum_enable = 1;
2857         if (mss) {
2858             ena_tx_ctx->tso_enable = 1;
2859             ena_meta->l4_hdr_len = tcp_hdr(skb)->doff;
2860             ena_tx_ctx->l4_csum_partial = 0;
2861         } else {
2862             ena_tx_ctx->tso_enable = 0;
2863             ena_meta->l4_hdr_len = 0;
2864             ena_tx_ctx->l4_csum_partial = 1;
2865         }
2866
2867         switch (ip_hdr(skb)->version) {
2868         case IPVERSION:
2869             ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV4;
2870             if (ip_hdr(skb)->frag_off & htons(IP_DF))
2871                 ena_tx_ctx->df = 1;
2872             if (mss)
2873                 ena_tx_ctx->l3_csum_enable = 1;
2874             l4_protocol = ip_hdr(skb)->protocol;
2875             break;
2876         case 6:
2877             ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV6;
2878             l4_protocol = ipv6_hdr(skb)->nexthdr;
2879             break;
2880         default:
2881             break;
2882         }
2883
2884         if (l4_protocol == IPPROTO_TCP)
2885             ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP;
2886         else
2887             ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP;
2888
2889         ena_meta->mss = mss;
2890         ena_meta->l3_hdr_len = skb_network_header_len(skb);
2891         ena_meta->l3_hdr_offset = skb_network_offset(skb);
2892         ena_tx_ctx->meta_valid = 1;
2893     } else if (disable_meta_caching) {
2894         memset(ena_meta, 0, sizeof(*ena_meta));
2895         ena_tx_ctx->meta_valid = 1;
2896     } else {
2897         ena_tx_ctx->meta_valid = 0;
2898     }
2899 }
2900
2901 static int ena_check_and_linearize_skb(struct ena_ring *tx_ring,
2902                        struct sk_buff *skb)
2903 {
2904     int num_frags, header_len, rc;
2905
2906     num_frags = skb_shinfo(skb)->nr_frags;
2907     header_len = skb_headlen(skb);
2908
2909     if (num_frags < tx_ring->sgl_size)
2910         return 0;
2911
2912     if ((num_frags == tx_ring->sgl_size) &&
2913         (header_len < tx_ring->tx_max_header_size))
2914         return 0;
2915
2916     ena_increase_stat(&tx_ring->tx_stats.linearize, 1, &tx_ring->syncp);
2917
2918     rc = skb_linearize(skb);
2919     if (unlikely(rc)) {
2920         ena_increase_stat(&tx_ring->tx_stats.linearize_failed, 1,
2921                   &tx_ring->syncp);
2922     }
2923
2924     return rc;
2925 }
2926
2927 static int ena_tx_map_skb(struct ena_ring *tx_ring,
2928               struct ena_tx_buffer *tx_info,
2929               struct sk_buff *skb,
2930               void **push_hdr,
2931               u16 *header_len)
2932 {
2933     struct ena_adapter *adapter = tx_ring->adapter;
2934     struct ena_com_buf *ena_buf;
2935     dma_addr_t dma;
2936     u32 skb_head_len, frag_len, last_frag;
2937     u16 push_len = 0;
2938     u16 delta = 0;
2939     int i = 0;
2940
2941     skb_head_len = skb_headlen(skb);
2942     tx_info->skb = skb;
2943     ena_buf = tx_info->bufs;
2944
2945     if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
2946         /* When the device is LLQ mode, the driver will copy
2947          * the header into the device memory space.
2948          * the ena_com layer assume the header is in a linear
2949          * memory space.
2950          * This assumption might be wrong since part of the header
2951          * can be in the fragmented buffers.
2952          * Use skb_header_pointer to make sure the header is in a
2953          * linear memory space.
2954          */
2955
2956         push_len = min_t(u32, skb->len, tx_ring->tx_max_header_size);
2957         *push_hdr = skb_header_pointer(skb, 0, push_len,
2958                            tx_ring->push_buf_intermediate_buf);
2959         *header_len = push_len;
2960         if (unlikely(skb->data != *push_hdr)) {
2961             ena_increase_stat(&tx_ring->tx_stats.llq_buffer_copy, 1,
2962                       &tx_ring->syncp);
2963
2964             delta = push_len - skb_head_len;
2965         }
2966     } else {
2967         *push_hdr = NULL;
2968         *header_len = min_t(u32, skb_head_len,
2969                     tx_ring->tx_max_header_size);
2970     }
2971
2972     netif_dbg(adapter, tx_queued, adapter->netdev,
2973           "skb: %p header_buf->vaddr: %p push_len: %d\n", skb,
2974           *push_hdr, push_len);
2975
2976     if (skb_head_len > push_len) {
2977         dma = dma_map_single(tx_ring->dev, skb->data + push_len,
2978                      skb_head_len - push_len, DMA_TO_DEVICE);
2979         if (unlikely(dma_mapping_error(tx_ring->dev, dma)))
2980             goto error_report_dma_error;
2981
2982         ena_buf->paddr = dma;
2983         ena_buf->len = skb_head_len - push_len;
2984
2985         ena_buf++;
2986         tx_info->num_of_bufs++;
2987         tx_info->map_linear_data = 1;
2988     } else {
2989         tx_info->map_linear_data = 0;
2990     }
2991
2992     last_frag = skb_shinfo(skb)->nr_frags;
2993
2994     for (i = 0; i < last_frag; i++) {
2995         const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2996
2997         frag_len = skb_frag_size(frag);
2998
2999         if (unlikely(delta >= frag_len)) {
3000             delta -= frag_len;
3001             continue;
3002         }
3003
3004         dma = skb_frag_dma_map(tx_ring->dev, frag, delta,
3005                        frag_len - delta, DMA_TO_DEVICE);
3006         if (unlikely(dma_mapping_error(tx_ring->dev, dma)))
3007             goto error_report_dma_error;
3008
3009         ena_buf->paddr = dma;
3010         ena_buf->len = frag_len - delta;
3011         ena_buf++;
3012         tx_info->num_of_bufs++;
3013         delta = 0;
3014     }
3015
3016     return 0;
3017
3018 error_report_dma_error:
3019     ena_increase_stat(&tx_ring->tx_stats.dma_mapping_err, 1,
3020               &tx_ring->syncp);
3021     netif_warn(adapter, tx_queued, adapter->netdev, "Failed to map skb\n");
3022
3023     tx_info->skb = NULL;
3024
3025     tx_info->num_of_bufs += i;
3026     ena_unmap_tx_buff(tx_ring, tx_info);
3027
3028     return -EINVAL;
3029 }
3030
3031 /* Called with netif_tx_lock. */
3032 static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
3033 {
3034     struct ena_adapter *adapter = netdev_priv(dev);
3035     struct ena_tx_buffer *tx_info;
3036     struct ena_com_tx_ctx ena_tx_ctx;
3037     struct ena_ring *tx_ring;
3038     struct netdev_queue *txq;
3039     void *push_hdr;
3040     u16 next_to_use, req_id, header_len;
3041     int qid, rc;
3042
3043     netif_dbg(adapter, tx_queued, dev, "%s skb %p\n", __func__, skb);
3044     /*  Determine which tx ring we will be placed on */
3045     qid = skb_get_queue_mapping(skb);
3046     tx_ring = &adapter->tx_ring[qid];
3047     txq = netdev_get_tx_queue(dev, qid);
3048
3049     rc = ena_check_and_linearize_skb(tx_ring, skb);
3050     if (unlikely(rc))
3051         goto error_drop_packet;
3052
3053     skb_tx_timestamp(skb);
3054
3055     next_to_use = tx_ring->next_to_use;
3056     req_id = tx_ring->free_ids[next_to_use];
3057     tx_info = &tx_ring->tx_buffer_info[req_id];
3058     tx_info->num_of_bufs = 0;
3059
3060     WARN(tx_info->skb, "SKB isn't NULL req_id %d\n", req_id);
3061
3062     rc = ena_tx_map_skb(tx_ring, tx_info, skb, &push_hdr, &header_len);
3063     if (unlikely(rc))
3064         goto error_drop_packet;
3065
3066     memset(&ena_tx_ctx, 0x0, sizeof(struct ena_com_tx_ctx));
3067     ena_tx_ctx.ena_bufs = tx_info->bufs;
3068     ena_tx_ctx.push_header = push_hdr;
3069     ena_tx_ctx.num_bufs = tx_info->num_of_bufs;
3070     ena_tx_ctx.req_id = req_id;
3071     ena_tx_ctx.header_len = header_len;
3072
3073     /* set flags and meta data */
3074     ena_tx_csum(&ena_tx_ctx, skb, tx_ring->disable_meta_caching);
3075
3076     rc = ena_xmit_common(dev,
3077                  tx_ring,
3078                  tx_info,
3079                  &ena_tx_ctx,
3080                  next_to_use,
3081                  skb->len);
3082     if (rc)
3083         goto error_unmap_dma;
3084
3085     netdev_tx_sent_queue(txq, skb->len);
3086
3087     /* stop the queue when no more space available, the packet can have up
3088      * to sgl_size + 2. one for the meta descriptor and one for header
3089      * (if the header is larger than tx_max_header_size).
3090      */
3091     if (unlikely(!ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
3092                            tx_ring->sgl_size + 2))) {
3093         netif_dbg(adapter, tx_queued, dev, "%s stop queue %d\n",
3094               __func__, qid);
3095
3096         netif_tx_stop_queue(txq);
3097         ena_increase_stat(&tx_ring->tx_stats.queue_stop, 1,
3098                   &tx_ring->syncp);
3099
3100         /* There is a rare condition where this function decide to
3101          * stop the queue but meanwhile clean_tx_irq updates
3102          * next_to_completion and terminates.
3103          * The queue will remain stopped forever.
3104          * To solve this issue add a mb() to make sure that
3105          * netif_tx_stop_queue() write is vissible before checking if
3106          * there is additional space in the queue.
3107          */
3108         smp_mb();
3109
3110         if (ena_com_sq_have_enough_space(tx_ring->ena_com_io_sq,
3111                          ENA_TX_WAKEUP_THRESH)) {
3112             netif_tx_wake_queue(txq);
3113             ena_increase_stat(&tx_ring->tx_stats.queue_wakeup, 1,
3114                       &tx_ring->syncp);
3115         }
3116     }
3117
3118     if (netif_xmit_stopped(txq) || !netdev_xmit_more())
3119         /* trigger the dma engine. ena_ring_tx_doorbell()
3120          * calls a memory barrier inside it.
3121          */
3122         ena_ring_tx_doorbell(tx_ring);
3123
3124     return NETDEV_TX_OK;
3125
3126 error_unmap_dma:
3127     ena_unmap_tx_buff(tx_ring, tx_info);
3128     tx_info->skb = NULL;
3129
3130 error_drop_packet:
3131     dev_kfree_skb(skb);
3132     return NETDEV_TX_OK;
3133 }
3134
3135 static u16 ena_select_queue(struct net_device *dev, struct sk_buff *skb,
3136                 struct net_device *sb_dev)
3137 {
3138     u16 qid;
3139     /* we suspect that this is good for in--kernel network services that
3140      * want to loop incoming skb rx to tx in normal user generated traffic,
3141      * most probably we will not get to this
3142      */
3143     if (skb_rx_queue_recorded(skb))
3144         qid = skb_get_rx_queue(skb);
3145     else
3146         qid = netdev_pick_tx(dev, skb, NULL);
3147
3148     return qid;
3149 }
3150
3151 static void ena_config_host_info(struct ena_com_dev *ena_dev, struct pci_dev *pdev)
3152 {
3153     struct device *dev = &pdev->dev;
3154     struct ena_admin_host_info *host_info;
3155     int rc;
3156
3157     /* Allocate only the host info */
3158     rc = ena_com_allocate_host_info(ena_dev);
3159     if (rc) {
3160         dev_err(dev, "Cannot allocate host info\n");
3161         return;
3162     }
3163
3164     host_info = ena_dev->host_attr.host_info;
3165
3166     host_info->bdf = (pdev->bus->number << 8) | pdev->devfn;
3167     host_info->os_type = ENA_ADMIN_OS_LINUX;
3168     host_info->kernel_ver = LINUX_VERSION_CODE;
3169     strlcpy(host_info->kernel_ver_str, utsname()->version,
3170         sizeof(host_info->kernel_ver_str) - 1);
3171     host_info->os_dist = 0;
3172     strncpy(host_info->os_dist_str, utsname()->release,
3173         sizeof(host_info->os_dist_str) - 1);
3174     host_info->driver_version =
3175         (DRV_MODULE_GEN_MAJOR) |
3176         (DRV_MODULE_GEN_MINOR << ENA_ADMIN_HOST_INFO_MINOR_SHIFT) |
3177         (DRV_MODULE_GEN_SUBMINOR << ENA_ADMIN_HOST_INFO_SUB_MINOR_SHIFT) |
3178         ("K"[0] << ENA_ADMIN_HOST_INFO_MODULE_TYPE_SHIFT);
3179     host_info->num_cpus = num_online_cpus();
3180
3181     host_info->driver_supported_features =
3182         ENA_ADMIN_HOST_INFO_RX_OFFSET_MASK |
3183         ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK |
3184         ENA_ADMIN_HOST_INFO_RX_BUF_MIRRORING_MASK |
3185         ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_MASK;
3186
3187     rc = ena_com_set_host_attributes(ena_dev);
3188     if (rc) {
3189         if (rc == -EOPNOTSUPP)
3190             dev_warn(dev, "Cannot set host attributes\n");
3191         else
3192             dev_err(dev, "Cannot set host attributes\n");
3193
3194         goto err;
3195     }
3196
3197     return;
3198
3199 err:
3200     ena_com_delete_host_info(ena_dev);
3201 }
3202
3203 static void ena_config_debug_area(struct ena_adapter *adapter)
3204 {
3205     u32 debug_area_size;
3206     int rc, ss_count;
3207
3208     ss_count = ena_get_sset_count(adapter->netdev, ETH_SS_STATS);
3209     if (ss_count <= 0) {
3210         netif_err(adapter, drv, adapter->netdev,
3211               "SS count is negative\n");
3212         return;
3213     }
3214
3215     /* allocate 32 bytes for each string and 64bit for the value */
3216     debug_area_size = ss_count * ETH_GSTRING_LEN + sizeof(u64) * ss_count;
3217
3218     rc = ena_com_allocate_debug_area(adapter->ena_dev, debug_area_size);
3219     if (rc) {
3220         netif_err(adapter, drv, adapter->netdev,
3221               "Cannot allocate debug area\n");
3222         return;
3223     }
3224
3225     rc = ena_com_set_host_attributes(adapter->ena_dev);
3226     if (rc) {
3227         if (rc == -EOPNOTSUPP)
3228             netif_warn(adapter, drv, adapter->netdev,
3229                    "Cannot set host attributes\n");
3230         else
3231             netif_err(adapter, drv, adapter->netdev,
3232                   "Cannot set host attributes\n");
3233         goto err;
3234     }
3235
3236     return;
3237 err:
3238     ena_com_delete_debug_area(adapter->ena_dev);
3239 }
3240
3241 int ena_update_hw_stats(struct ena_adapter *adapter)
3242 {
3243     int rc;
3244
3245     rc = ena_com_get_eni_stats(adapter->ena_dev, &adapter->eni_stats);
3246     if (rc) {
3247         netdev_err(adapter->netdev, "Failed to get ENI stats\n");
3248         return rc;
3249     }
3250
3251     return 0;
3252 }
3253
3254 static void ena_get_stats64(struct net_device *netdev,
3255                 struct rtnl_link_stats64 *stats)
3256 {
3257     struct ena_adapter *adapter = netdev_priv(netdev);
3258     struct ena_ring *rx_ring, *tx_ring;
3259     unsigned int start;
3260     u64 rx_drops;
3261     u64 tx_drops;
3262     int i;
3263
3264     if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
3265         return;
3266
3267     for (i = 0; i < adapter->num_io_queues; i++) {
3268         u64 bytes, packets;
3269
3270         tx_ring = &adapter->tx_ring[i];
3271
3272         do {
3273             start = u64_stats_fetch_begin_irq(&tx_ring->syncp);
3274             packets = tx_ring->tx_stats.cnt;
3275             bytes = tx_ring->tx_stats.bytes;
3276         } while (u64_stats_fetch_retry_irq(&tx_ring->syncp, start));
3277
3278         stats->tx_packets += packets;
3279         stats->tx_bytes += bytes;
3280
3281         rx_ring = &adapter->rx_ring[i];
3282
3283         do {
3284             start = u64_stats_fetch_begin_irq(&rx_ring->syncp);
3285             packets = rx_ring->rx_stats.cnt;
3286             bytes = rx_ring->rx_stats.bytes;
3287         } while (u64_stats_fetch_retry_irq(&rx_ring->syncp, start));
3288
3289         stats->rx_packets += packets;
3290         stats->rx_bytes += bytes;
3291     }
3292
3293     do {
3294         start = u64_stats_fetch_begin_irq(&adapter->syncp);
3295         rx_drops = adapter->dev_stats.rx_drops;
3296         tx_drops = adapter->dev_stats.tx_drops;
3297     } while (u64_stats_fetch_retry_irq(&adapter->syncp, start));
3298
3299     stats->rx_dropped = rx_drops;
3300     stats->tx_dropped = tx_drops;
3301
3302     stats->multicast = 0;
3303     stats->collisions = 0;
3304
3305     stats->rx_length_errors = 0;
3306     stats->rx_crc_errors = 0;
3307     stats->rx_frame_errors = 0;
3308     stats->rx_fifo_errors = 0;
3309     stats->rx_missed_errors = 0;
3310     stats->tx_window_errors = 0;
3311
3312     stats->rx_errors = 0;
3313     stats->tx_errors = 0;
3314 }
3315
3316 static const struct net_device_ops ena_netdev_ops = {
3317     .ndo_open       = ena_open,
3318     .ndo_stop       = ena_close,
3319     .ndo_start_xmit     = ena_start_xmit,
3320     .ndo_select_queue   = ena_select_queue,
3321     .ndo_get_stats64    = ena_get_stats64,
3322     .ndo_tx_timeout     = ena_tx_timeout,
3323     .ndo_change_mtu     = ena_change_mtu,
3324     .ndo_set_mac_address    = NULL,
3325     .ndo_validate_addr  = eth_validate_addr,
3326     .ndo_bpf        = ena_xdp,
3327     .ndo_xdp_xmit       = ena_xdp_xmit,
3328 };
3329
3330 static int ena_device_validate_params(struct ena_adapter *adapter,
3331                       struct ena_com_dev_get_features_ctx *get_feat_ctx)
3332 {
3333     struct net_device *netdev = adapter->netdev;
3334     int rc;
3335
3336     rc = ether_addr_equal(get_feat_ctx->dev_attr.mac_addr,
3337                   adapter->mac_addr);
3338     if (!rc) {
3339         netif_err(adapter, drv, netdev,
3340               "Error, mac address are different\n");
3341         return -EINVAL;
3342     }
3343
3344     if (get_feat_ctx->dev_attr.max_mtu < netdev->mtu) {
3345         netif_err(adapter, drv, netdev,
3346               "Error, device max mtu is smaller than netdev MTU\n");
3347         return -EINVAL;
3348     }
3349
3350     return 0;
3351 }
3352
3353 static void set_default_llq_configurations(struct ena_llq_configurations *llq_config)
3354 {
3355     llq_config->llq_header_location = ENA_ADMIN_INLINE_HEADER;
3356     llq_config->llq_stride_ctrl = ENA_ADMIN_MULTIPLE_DESCS_PER_ENTRY;
3357     llq_config->llq_num_decs_before_header = ENA_ADMIN_LLQ_NUM_DESCS_BEFORE_HEADER_2;
3358     llq_config->llq_ring_entry_size = ENA_ADMIN_LIST_ENTRY_SIZE_128B;
3359     llq_config->llq_ring_entry_size_value = 128;
3360 }
3361
3362 static int ena_set_queues_placement_policy(struct pci_dev *pdev,
3363                        struct ena_com_dev *ena_dev,
3364                        struct ena_admin_feature_llq_desc *llq,
3365                        struct ena_llq_configurations *llq_default_configurations)
3366 {
3367     int rc;
3368     u32 llq_feature_mask;
3369
3370     llq_feature_mask = 1 << ENA_ADMIN_LLQ;
3371     if (!(ena_dev->supported_features & llq_feature_mask)) {
3372         dev_warn(&pdev->dev,
3373             "LLQ is not supported Fallback to host mode policy.\n");
3374         ena_dev->tx_mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
3375         return 0;
3376     }
3377
3378     rc = ena_com_config_dev_mode(ena_dev, llq, llq_default_configurations);
3379     if (unlikely(rc)) {
3380         dev_err(&pdev->dev,
3381             "Failed to configure the device mode.  Fallback to host mode policy.\n");
3382         ena_dev->tx_mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
3383     }
3384
3385     return 0;
3386 }
3387
3388 static int ena_map_llq_mem_bar(struct pci_dev *pdev, struct ena_com_dev *ena_dev,
3389                    int bars)
3390 {
3391     bool has_mem_bar = !!(bars & BIT(ENA_MEM_BAR));
3392
3393     if (!has_mem_bar) {
3394         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
3395             dev_err(&pdev->dev,
3396                 "ENA device does not expose LLQ bar. Fallback to host mode policy.\n");
3397             ena_dev->tx_mem_queue_type = ENA_ADMIN_PLACEMENT_POLICY_HOST;
3398         }
3399
3400         return 0;
3401     }
3402
3403     ena_dev->mem_bar = devm_ioremap_wc(&pdev->dev,
3404                        pci_resource_start(pdev, ENA_MEM_BAR),
3405                        pci_resource_len(pdev, ENA_MEM_BAR));
3406
3407     if (!ena_dev->mem_bar)
3408         return -EFAULT;
3409
3410     return 0;
3411 }
3412
3413 static int ena_device_init(struct ena_com_dev *ena_dev, struct pci_dev *pdev,
3414                struct ena_com_dev_get_features_ctx *get_feat_ctx,
3415                bool *wd_state)
3416 {
3417     struct ena_llq_configurations llq_config;
3418     struct device *dev = &pdev->dev;
3419     bool readless_supported;
3420     u32 aenq_groups;
3421     int dma_width;
3422     int rc;
3423
3424     rc = ena_com_mmio_reg_read_request_init(ena_dev);
3425     if (rc) {
3426         dev_err(dev, "Failed to init mmio read less\n");
3427         return rc;
3428     }
3429
3430     /* The PCIe configuration space revision id indicate if mmio reg
3431      * read is disabled
3432      */
3433     readless_supported = !(pdev->revision & ENA_MMIO_DISABLE_REG_READ);
3434     ena_com_set_mmio_read_mode(ena_dev, readless_supported);
3435
3436     rc = ena_com_dev_reset(ena_dev, ENA_REGS_RESET_NORMAL);
3437     if (rc) {
3438         dev_err(dev, "Can not reset device\n");
3439         goto err_mmio_read_less;
3440     }
3441
3442     rc = ena_com_validate_version(ena_dev);
3443     if (rc) {
3444         dev_err(dev, "Device version is too low\n");
3445         goto err_mmio_read_less;
3446     }
3447
3448     dma_width = ena_com_get_dma_width(ena_dev);
3449     if (dma_width < 0) {
3450         dev_err(dev, "Invalid dma width value %d", dma_width);
3451         rc = dma_width;
3452         goto err_mmio_read_less;
3453     }
3454
3455     rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(dma_width));
3456     if (rc) {
3457         dev_err(dev, "dma_set_mask_and_coherent failed %d\n", rc);
3458         goto err_mmio_read_less;
3459     }
3460
3461     /* ENA admin level init */
3462     rc = ena_com_admin_init(ena_dev, &aenq_handlers);
3463     if (rc) {
3464         dev_err(dev,
3465             "Can not initialize ena admin queue with device\n");
3466         goto err_mmio_read_less;
3467     }
3468
3469     /* To enable the msix interrupts the driver needs to know the number
3470      * of queues. So the driver uses polling mode to retrieve this
3471      * information
3472      */
3473     ena_com_set_admin_polling_mode(ena_dev, true);
3474
3475     ena_config_host_info(ena_dev, pdev);
3476
3477     /* Get Device Attributes*/
3478     rc = ena_com_get_dev_attr_feat(ena_dev, get_feat_ctx);
3479     if (rc) {
3480         dev_err(dev, "Cannot get attribute for ena device rc=%d\n", rc);
3481         goto err_admin_init;
3482     }
3483
3484     /* Try to turn all the available aenq groups */
3485     aenq_groups = BIT(ENA_ADMIN_LINK_CHANGE) |
3486         BIT(ENA_ADMIN_FATAL_ERROR) |
3487         BIT(ENA_ADMIN_WARNING) |
3488         BIT(ENA_ADMIN_NOTIFICATION) |
3489         BIT(ENA_ADMIN_KEEP_ALIVE);
3490
3491     aenq_groups &= get_feat_ctx->aenq.supported_groups;
3492
3493     rc = ena_com_set_aenq_config(ena_dev, aenq_groups);
3494     if (rc) {
3495         dev_err(dev, "Cannot configure aenq groups rc= %d\n", rc);
3496         goto err_admin_init;
3497     }
3498
3499     *wd_state = !!(aenq_groups & BIT(ENA_ADMIN_KEEP_ALIVE));
3500
3501     set_default_llq_configurations(&llq_config);
3502
3503     rc = ena_set_queues_placement_policy(pdev, ena_dev, &get_feat_ctx->llq,
3504                          &llq_config);
3505     if (rc) {
3506         dev_err(dev, "ENA device init failed\n");
3507         goto err_admin_init;
3508     }
3509
3510     return 0;
3511
3512 err_admin_init:
3513     ena_com_delete_host_info(ena_dev);
3514     ena_com_admin_destroy(ena_dev);
3515 err_mmio_read_less:
3516     ena_com_mmio_reg_read_request_destroy(ena_dev);
3517
3518     return rc;
3519 }
3520
3521 static int ena_enable_msix_and_set_admin_interrupts(struct ena_adapter *adapter)
3522 {
3523     struct ena_com_dev *ena_dev = adapter->ena_dev;
3524     struct device *dev = &adapter->pdev->dev;
3525     int rc;
3526
3527     rc = ena_enable_msix(adapter);
3528     if (rc) {
3529         dev_err(dev, "Can not reserve msix vectors\n");
3530         return rc;
3531     }
3532
3533     ena_setup_mgmnt_intr(adapter);
3534
3535     rc = ena_request_mgmnt_irq(adapter);
3536     if (rc) {
3537         dev_err(dev, "Can not setup management interrupts\n");
3538         goto err_disable_msix;
3539     }
3540
3541     ena_com_set_admin_polling_mode(ena_dev, false);
3542
3543     ena_com_admin_aenq_enable(ena_dev);
3544
3545     return 0;
3546
3547 err_disable_msix:
3548     ena_disable_msix(adapter);
3549
3550     return rc;
3551 }
3552
3553 static void ena_destroy_device(struct ena_adapter *adapter, bool graceful)
3554 {
3555     struct net_device *netdev = adapter->netdev;
3556     struct ena_com_dev *ena_dev = adapter->ena_dev;
3557     bool dev_up;
3558
3559     if (!test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
3560         return;
3561
3562     netif_carrier_off(netdev);
3563
3564     del_timer_sync(&adapter->timer_service);
3565
3566     dev_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
3567     adapter->dev_up_before_reset = dev_up;
3568     if (!graceful)
3569         ena_com_set_admin_running_state(ena_dev, false);
3570
3571     if (test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
3572         ena_down(adapter);
3573
3574     /* Stop the device from sending AENQ events (in case reset flag is set
3575      *  and device is up, ena_down() already reset the device.
3576      */
3577     if (!(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags) && dev_up))
3578         ena_com_dev_reset(adapter->ena_dev, adapter->reset_reason);
3579
3580     ena_free_mgmnt_irq(adapter);
3581
3582     ena_disable_msix(adapter);
3583
3584     ena_com_abort_admin_commands(ena_dev);
3585
3586     ena_com_wait_for_abort_completion(ena_dev);
3587
3588     ena_com_admin_destroy(ena_dev);
3589
3590     ena_com_mmio_reg_read_request_destroy(ena_dev);
3591
3592     /* return reset reason to default value */
3593     adapter->reset_reason = ENA_REGS_RESET_NORMAL;
3594
3595     clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
3596     clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
3597 }
3598
3599 static int ena_restore_device(struct ena_adapter *adapter)
3600 {
3601     struct ena_com_dev_get_features_ctx get_feat_ctx;
3602     struct ena_com_dev *ena_dev = adapter->ena_dev;
3603     struct pci_dev *pdev = adapter->pdev;
3604     bool wd_state;
3605     int rc;
3606
3607     set_bit(ENA_FLAG_ONGOING_RESET, &adapter->flags);
3608     rc = ena_device_init(ena_dev, adapter->pdev, &get_feat_ctx, &wd_state);
3609     if (rc) {
3610         dev_err(&pdev->dev, "Can not initialize device\n");
3611         goto err;
3612     }
3613     adapter->wd_state = wd_state;
3614
3615     rc = ena_device_validate_params(adapter, &get_feat_ctx);
3616     if (rc) {
3617         dev_err(&pdev->dev, "Validation of device parameters failed\n");
3618         goto err_device_destroy;
3619     }
3620
3621     rc = ena_enable_msix_and_set_admin_interrupts(adapter);
3622     if (rc) {
3623         dev_err(&pdev->dev, "Enable MSI-X failed\n");
3624         goto err_device_destroy;
3625     }
3626     /* If the interface was up before the reset bring it up */
3627     if (adapter->dev_up_before_reset) {
3628         rc = ena_up(adapter);
3629         if (rc) {
3630             dev_err(&pdev->dev, "Failed to create I/O queues\n");
3631             goto err_disable_msix;
3632         }
3633     }
3634
3635     set_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
3636
3637     clear_bit(ENA_FLAG_ONGOING_RESET, &adapter->flags);
3638     if (test_bit(ENA_FLAG_LINK_UP, &adapter->flags))
3639         netif_carrier_on(adapter->netdev);
3640
3641     mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
3642     adapter->last_keep_alive_jiffies = jiffies;
3643
3644     return rc;
3645 err_disable_msix:
3646     ena_free_mgmnt_irq(adapter);
3647     ena_disable_msix(adapter);
3648 err_device_destroy:
3649     ena_com_abort_admin_commands(ena_dev);
3650     ena_com_wait_for_abort_completion(ena_dev);
3651     ena_com_admin_destroy(ena_dev);
3652     ena_com_dev_reset(ena_dev, ENA_REGS_RESET_DRIVER_INVALID_STATE);
3653     ena_com_mmio_reg_read_request_destroy(ena_dev);
3654 err:
3655     clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
3656     clear_bit(ENA_FLAG_ONGOING_RESET, &adapter->flags);
3657     dev_err(&pdev->dev,
3658         "Reset attempt failed. Can not reset the device\n");
3659
3660     return rc;
3661 }
3662
3663 static void ena_fw_reset_device(struct work_struct *work)
3664 {
3665     struct ena_adapter *adapter =
3666         container_of(work, struct ena_adapter, reset_task);
3667
3668     rtnl_lock();
3669
3670     if (likely(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
3671         ena_destroy_device(adapter, false);
3672         ena_restore_device(adapter);
3673
3674         dev_err(&adapter->pdev->dev, "Device reset completed successfully\n");
3675     }
3676
3677     rtnl_unlock();
3678 }
3679
3680 static int check_for_rx_interrupt_queue(struct ena_adapter *adapter,
3681                     struct ena_ring *rx_ring)
3682 {
3683     struct ena_napi *ena_napi = container_of(rx_ring->napi, struct ena_napi, napi);
3684
3685     if (likely(READ_ONCE(ena_napi->first_interrupt)))
3686         return 0;
3687
3688     if (ena_com_cq_empty(rx_ring->ena_com_io_cq))
3689         return 0;
3690
3691     rx_ring->no_interrupt_event_cnt++;
3692
3693     if (rx_ring->no_interrupt_event_cnt == ENA_MAX_NO_INTERRUPT_ITERATIONS) {
3694         netif_err(adapter, rx_err, adapter->netdev,
3695               "Potential MSIX issue on Rx side Queue = %d. Reset the device\n",
3696               rx_ring->qid);
3697
3698         ena_reset_device(adapter, ENA_REGS_RESET_MISS_INTERRUPT);
3699         return -EIO;
3700     }
3701
3702     return 0;
3703 }
3704
3705 static int check_missing_comp_in_tx_queue(struct ena_adapter *adapter,
3706                       struct ena_ring *tx_ring)
3707 {
3708     struct ena_napi *ena_napi = container_of(tx_ring->napi, struct ena_napi, napi);
3709     unsigned int time_since_last_napi;
3710     unsigned int missing_tx_comp_to;
3711     bool is_tx_comp_time_expired;
3712     struct ena_tx_buffer *tx_buf;
3713     unsigned long last_jiffies;
3714     u32 missed_tx = 0;
3715     int i, rc = 0;
3716
3717     for (i = 0; i < tx_ring->ring_size; i++) {
3718         tx_buf = &tx_ring->tx_buffer_info[i];
3719         last_jiffies = tx_buf->last_jiffies;
3720
3721         if (last_jiffies == 0)
3722             /* no pending Tx at this location */
3723             continue;
3724
3725         is_tx_comp_time_expired = time_is_before_jiffies(last_jiffies +
3726              2 * adapter->missing_tx_completion_to);
3727
3728         if (unlikely(!READ_ONCE(ena_napi->first_interrupt) && is_tx_comp_time_expired)) {
3729             /* If after graceful period interrupt is still not
3730              * received, we schedule a reset
3731              */
3732             netif_err(adapter, tx_err, adapter->netdev,
3733                   "Potential MSIX issue on Tx side Queue = %d. Reset the device\n",
3734                   tx_ring->qid);
3735             ena_reset_device(adapter, ENA_REGS_RESET_MISS_INTERRUPT);
3736             return -EIO;
3737         }
3738
3739         is_tx_comp_time_expired = time_is_before_jiffies(last_jiffies +
3740             adapter->missing_tx_completion_to);
3741
3742         if (unlikely(is_tx_comp_time_expired)) {
3743             if (!tx_buf->print_once) {
3744                 time_since_last_napi = jiffies_to_usecs(jiffies - tx_ring->tx_stats.last_napi_jiffies);
3745                 missing_tx_comp_to = jiffies_to_msecs(adapter->missing_tx_completion_to);
3746                 netif_notice(adapter, tx_err, adapter->netdev,
3747                          "Found a Tx that wasn't completed on time, qid %d, index %d. %u usecs have passed since last napi execution. Missing Tx timeout value %u msecs\n",
3748                          tx_ring->qid, i, time_since_last_napi, missing_tx_comp_to);
3749             }
3750
3751             tx_buf->print_once = 1;
3752             missed_tx++;
3753         }
3754     }
3755
3756     if (unlikely(missed_tx > adapter->missing_tx_completion_threshold)) {
3757         netif_err(adapter, tx_err, adapter->netdev,
3758               "The number of lost tx completions is above the threshold (%d > %d). Reset the device\n",
3759               missed_tx,
3760               adapter->missing_tx_completion_threshold);
3761         ena_reset_device(adapter, ENA_REGS_RESET_MISS_TX_CMPL);
3762         rc = -EIO;
3763     }
3764
3765     ena_increase_stat(&tx_ring->tx_stats.missed_tx, missed_tx,
3766               &tx_ring->syncp);
3767
3768     return rc;
3769 }
3770
3771 static void check_for_missing_completions(struct ena_adapter *adapter)
3772 {
3773     struct ena_ring *tx_ring;
3774     struct ena_ring *rx_ring;
3775     int i, budget, rc;
3776     int io_queue_count;
3777
3778     io_queue_count = adapter->xdp_num_queues + adapter->num_io_queues;
3779     /* Make sure the driver doesn't turn the device in other process */
3780     smp_rmb();
3781
3782     if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
3783         return;
3784
3785     if (test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))
3786         return;
3787
3788     if (adapter->missing_tx_completion_to == ENA_HW_HINTS_NO_TIMEOUT)
3789         return;
3790
3791     budget = ENA_MONITORED_TX_QUEUES;
3792
3793     for (i = adapter->last_monitored_tx_qid; i < io_queue_count; i++) {
3794         tx_ring = &adapter->tx_ring[i];
3795         rx_ring = &adapter->rx_ring[i];
3796
3797         rc = check_missing_comp_in_tx_queue(adapter, tx_ring);
3798         if (unlikely(rc))
3799             return;
3800
3801         rc =  !ENA_IS_XDP_INDEX(adapter, i) ?
3802             check_for_rx_interrupt_queue(adapter, rx_ring) : 0;
3803         if (unlikely(rc))
3804             return;
3805
3806         budget--;
3807         if (!budget)
3808             break;
3809     }
3810
3811     adapter->last_monitored_tx_qid = i % io_queue_count;
3812 }
3813
3814 /* trigger napi schedule after 2 consecutive detections */
3815 #define EMPTY_RX_REFILL 2
3816 /* For the rare case where the device runs out of Rx descriptors and the
3817  * napi handler failed to refill new Rx descriptors (due to a lack of memory
3818  * for example).
3819  * This case will lead to a deadlock:
3820  * The device won't send interrupts since all the new Rx packets will be dropped
3821  * The napi handler won't allocate new Rx descriptors so the device will be
3822  * able to send new packets.
3823  *
3824  * This scenario can happen when the kernel's vm.min_free_kbytes is too small.
3825  * It is recommended to have at least 512MB, with a minimum of 128MB for
3826  * constrained environment).
3827  *
3828  * When such a situation is detected - Reschedule napi
3829  */
3830 static void check_for_empty_rx_ring(struct ena_adapter *adapter)
3831 {
3832     struct ena_ring *rx_ring;
3833     int i, refill_required;
3834
3835     if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
3836         return;
3837
3838     if (test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))
3839         return;
3840
3841     for (i = 0; i < adapter->num_io_queues; i++) {
3842         rx_ring = &adapter->rx_ring[i];
3843
3844         refill_required = ena_com_free_q_entries(rx_ring->ena_com_io_sq);
3845         if (unlikely(refill_required == (rx_ring->ring_size - 1))) {
3846             rx_ring->empty_rx_queue++;
3847
3848             if (rx_ring->empty_rx_queue >= EMPTY_RX_REFILL) {
3849                 ena_increase_stat(&rx_ring->rx_stats.empty_rx_ring, 1,
3850                           &rx_ring->syncp);
3851
3852                 netif_err(adapter, drv, adapter->netdev,
3853                       "Trigger refill for ring %d\n", i);
3854
3855                 napi_schedule(rx_ring->napi);
3856                 rx_ring->empty_rx_queue = 0;
3857             }
3858         } else {
3859             rx_ring->empty_rx_queue = 0;
3860         }
3861     }
3862 }
3863
3864 /* Check for keep alive expiration */
3865 static void check_for_missing_keep_alive(struct ena_adapter *adapter)
3866 {
3867     unsigned long keep_alive_expired;
3868
3869     if (!adapter->wd_state)
3870         return;
3871
3872     if (adapter->keep_alive_timeout == ENA_HW_HINTS_NO_TIMEOUT)
3873         return;
3874
3875     keep_alive_expired = adapter->last_keep_alive_jiffies +
3876                  adapter->keep_alive_timeout;
3877     if (unlikely(time_is_before_jiffies(keep_alive_expired))) {
3878         netif_err(adapter, drv, adapter->netdev,
3879               "Keep alive watchdog timeout.\n");
3880         ena_increase_stat(&adapter->dev_stats.wd_expired, 1,
3881                   &adapter->syncp);
3882         ena_reset_device(adapter, ENA_REGS_RESET_KEEP_ALIVE_TO);
3883     }
3884 }
3885
3886 static void check_for_admin_com_state(struct ena_adapter *adapter)
3887 {
3888     if (unlikely(!ena_com_get_admin_running_state(adapter->ena_dev))) {
3889         netif_err(adapter, drv, adapter->netdev,
3890               "ENA admin queue is not in running state!\n");
3891         ena_increase_stat(&adapter->dev_stats.admin_q_pause, 1,
3892                   &adapter->syncp);
3893         ena_reset_device(adapter, ENA_REGS_RESET_ADMIN_TO);
3894     }
3895 }
3896
3897 static void ena_update_hints(struct ena_adapter *adapter,
3898                  struct ena_admin_ena_hw_hints *hints)
3899 {
3900     struct net_device *netdev = adapter->netdev;
3901
3902     if (hints->admin_completion_tx_timeout)
3903         adapter->ena_dev->admin_queue.completion_timeout =
3904             hints->admin_completion_tx_timeout * 1000;
3905
3906     if (hints->mmio_read_timeout)
3907         /* convert to usec */
3908         adapter->ena_dev->mmio_read.reg_read_to =
3909             hints->mmio_read_timeout * 1000;
3910
3911     if (hints->missed_tx_completion_count_threshold_to_reset)
3912         adapter->missing_tx_completion_threshold =
3913             hints->missed_tx_completion_count_threshold_to_reset;
3914
3915     if (hints->missing_tx_completion_timeout) {
3916         if (hints->missing_tx_completion_timeout == ENA_HW_HINTS_NO_TIMEOUT)
3917             adapter->missing_tx_completion_to = ENA_HW_HINTS_NO_TIMEOUT;
3918         else
3919             adapter->missing_tx_completion_to =
3920                 msecs_to_jiffies(hints->missing_tx_completion_timeout);
3921     }
3922
3923     if (hints->netdev_wd_timeout)
3924         netdev->watchdog_timeo = msecs_to_jiffies(hints->netdev_wd_timeout);
3925
3926     if (hints->driver_watchdog_timeout) {
3927         if (hints->driver_watchdog_timeout == ENA_HW_HINTS_NO_TIMEOUT)
3928             adapter->keep_alive_timeout = ENA_HW_HINTS_NO_TIMEOUT;
3929         else
3930             adapter->keep_alive_timeout =
3931                 msecs_to_jiffies(hints->driver_watchdog_timeout);
3932     }
3933 }
3934
3935 static void ena_update_host_info(struct ena_admin_host_info *host_info,
3936                  struct net_device *netdev)
3937 {
3938     host_info->supported_network_features[0] =
3939         netdev->features & GENMASK_ULL(31, 0);
3940     host_info->supported_network_features[1] =
3941         (netdev->features & GENMASK_ULL(63, 32)) >> 32;
3942 }
3943
3944 static void ena_timer_service(struct timer_list *t)
3945 {
3946     struct ena_adapter *adapter = from_timer(adapter, t, timer_service);
3947     u8 *debug_area = adapter->ena_dev->host_attr.debug_area_virt_addr;
3948     struct ena_admin_host_info *host_info =
3949         adapter->ena_dev->host_attr.host_info;
3950
3951     check_for_missing_keep_alive(adapter);
3952
3953     check_for_admin_com_state(adapter);
3954
3955     check_for_missing_completions(adapter);
3956
3957     check_for_empty_rx_ring(adapter);
3958
3959     if (debug_area)
3960         ena_dump_stats_to_buf(adapter, debug_area);
3961
3962     if (host_info)
3963         ena_update_host_info(host_info, adapter->netdev);
3964
3965     if (unlikely(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
3966         netif_err(adapter, drv, adapter->netdev,
3967               "Trigger reset is on\n");
3968         ena_dump_stats_to_dmesg(adapter);
3969         queue_work(ena_wq, &adapter->reset_task);
3970         return;
3971     }
3972
3973     /* Reset the timer */
3974     mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
3975 }
3976
3977 static u32 ena_calc_max_io_queue_num(struct pci_dev *pdev,
3978                      struct ena_com_dev *ena_dev,
3979                      struct ena_com_dev_get_features_ctx *get_feat_ctx)
3980 {
3981     u32 io_tx_sq_num, io_tx_cq_num, io_rx_num, max_num_io_queues;
3982
3983     if (ena_dev->supported_features & BIT(ENA_ADMIN_MAX_QUEUES_EXT)) {
3984         struct ena_admin_queue_ext_feature_fields *max_queue_ext =
3985             &get_feat_ctx->max_queue_ext.max_queue_ext;
3986         io_rx_num = min_t(u32, max_queue_ext->max_rx_sq_num,
3987                   max_queue_ext->max_rx_cq_num);
3988
3989         io_tx_sq_num = max_queue_ext->max_tx_sq_num;
3990         io_tx_cq_num = max_queue_ext->max_tx_cq_num;
3991     } else {
3992         struct ena_admin_queue_feature_desc *max_queues =
3993             &get_feat_ctx->max_queues;
3994         io_tx_sq_num = max_queues->max_sq_num;
3995         io_tx_cq_num = max_queues->max_cq_num;
3996         io_rx_num = min_t(u32, io_tx_sq_num, io_tx_cq_num);
3997     }
3998
3999     /* In case of LLQ use the llq fields for the tx SQ/CQ */
4000     if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
4001         io_tx_sq_num = get_feat_ctx->llq.max_llq_num;
4002
4003     max_num_io_queues = min_t(u32, num_online_cpus(), ENA_MAX_NUM_IO_QUEUES);
4004     max_num_io_queues = min_t(u32, max_num_io_queues, io_rx_num);
4005     max_num_io_queues = min_t(u32, max_num_io_queues, io_tx_sq_num);
4006     max_num_io_queues = min_t(u32, max_num_io_queues, io_tx_cq_num);
4007     /* 1 IRQ for mgmnt and 1 IRQs for each IO direction */
4008     max_num_io_queues = min_t(u32, max_num_io_queues, pci_msix_vec_count(pdev) - 1);
4009
4010     return max_num_io_queues;
4011 }
4012
4013 static void ena_set_dev_offloads(struct ena_com_dev_get_features_ctx *feat,
4014                  struct net_device *netdev)
4015 {
4016     netdev_features_t dev_features = 0;
4017
4018     /* Set offload features */
4019     if (feat->offload.tx &
4020         ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV4_CSUM_PART_MASK)
4021         dev_features |= NETIF_F_IP_CSUM;
4022
4023     if (feat->offload.tx &
4024         ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV6_CSUM_PART_MASK)
4025         dev_features |= NETIF_F_IPV6_CSUM;
4026
4027     if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV4_MASK)
4028         dev_features |= NETIF_F_TSO;
4029
4030     if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV6_MASK)
4031         dev_features |= NETIF_F_TSO6;
4032
4033     if (feat->offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_ECN_MASK)
4034         dev_features |= NETIF_F_TSO_ECN;
4035
4036     if (feat->offload.rx_supported &
4037         ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV4_CSUM_MASK)
4038         dev_features |= NETIF_F_RXCSUM;
4039
4040     if (feat->offload.rx_supported &
4041         ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV6_CSUM_MASK)
4042         dev_features |= NETIF_F_RXCSUM;
4043
4044     netdev->features =
4045         dev_features |
4046         NETIF_F_SG |
4047         NETIF_F_RXHASH |
4048         NETIF_F_HIGHDMA;
4049
4050     netdev->hw_features |= netdev->features;
4051     netdev->vlan_features |= netdev->features;
4052 }
4053
4054 static void ena_set_conf_feat_params(struct ena_adapter *adapter,
4055                      struct ena_com_dev_get_features_ctx *feat)
4056 {
4057     struct net_device *netdev = adapter->netdev;
4058
4059     /* Copy mac address */
4060     if (!is_valid_ether_addr(feat->dev_attr.mac_addr)) {
4061         eth_hw_addr_random(netdev);
4062         ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
4063     } else {
4064         ether_addr_copy(adapter->mac_addr, feat->dev_attr.mac_addr);
4065         eth_hw_addr_set(netdev, adapter->mac_addr);
4066     }
4067
4068     /* Set offload features */
4069     ena_set_dev_offloads(feat, netdev);
4070
4071     adapter->max_mtu = feat->dev_attr.max_mtu;
4072     netdev->max_mtu = adapter->max_mtu;
4073     netdev->min_mtu = ENA_MIN_MTU;
4074 }
4075
4076 static int ena_rss_init_default(struct ena_adapter *adapter)
4077 {
4078     struct ena_com_dev *ena_dev = adapter->ena_dev;
4079     struct device *dev = &adapter->pdev->dev;
4080     int rc, i;
4081     u32 val;
4082
4083     rc = ena_com_rss_init(ena_dev, ENA_RX_RSS_TABLE_LOG_SIZE);
4084     if (unlikely(rc)) {
4085         dev_err(dev, "Cannot init indirect table\n");
4086         goto err_rss_init;
4087     }
4088
4089     for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; i++) {
4090         val = ethtool_rxfh_indir_default(i, adapter->num_io_queues);
4091         rc = ena_com_indirect_table_fill_entry(ena_dev, i,
4092                                ENA_IO_RXQ_IDX(val));
4093         if (unlikely(rc)) {
4094             dev_err(dev, "Cannot fill indirect table\n");
4095             goto err_fill_indir;
4096         }
4097     }
4098
4099     rc = ena_com_fill_hash_function(ena_dev, ENA_ADMIN_TOEPLITZ, NULL,
4100                     ENA_HASH_KEY_SIZE, 0xFFFFFFFF);
4101     if (unlikely(rc && (rc != -EOPNOTSUPP))) {
4102         dev_err(dev, "Cannot fill hash function\n");
4103         goto err_fill_indir;
4104     }
4105
4106     rc = ena_com_set_default_hash_ctrl(ena_dev);
4107     if (unlikely(rc && (rc != -EOPNOTSUPP))) {
4108         dev_err(dev, "Cannot fill hash control\n");
4109         goto err_fill_indir;
4110     }
4111
4112     return 0;
4113
4114 err_fill_indir:
4115     ena_com_rss_destroy(ena_dev);
4116 err_rss_init:
4117
4118     return rc;
4119 }
4120
4121 static void ena_release_bars(struct ena_com_dev *ena_dev, struct pci_dev *pdev)
4122 {
4123     int release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & ENA_BAR_MASK;
4124
4125     pci_release_selected_regions(pdev, release_bars);
4126 }
4127
4128
4129 static void ena_calc_io_queue_size(struct ena_adapter *adapter,
4130                    struct ena_com_dev_get_features_ctx *get_feat_ctx)
4131 {
4132     struct ena_admin_feature_llq_desc *llq = &get_feat_ctx->llq;
4133     struct ena_com_dev *ena_dev = adapter->ena_dev;
4134     u32 tx_queue_size = ENA_DEFAULT_RING_SIZE;
4135     u32 rx_queue_size = ENA_DEFAULT_RING_SIZE;
4136     u32 max_tx_queue_size;
4137     u32 max_rx_queue_size;
4138
4139     if (ena_dev->supported_features & BIT(ENA_ADMIN_MAX_QUEUES_EXT)) {
4140         struct ena_admin_queue_ext_feature_fields *max_queue_ext =
4141             &get_feat_ctx->max_queue_ext.max_queue_ext;
4142         max_rx_queue_size = min_t(u32, max_queue_ext->max_rx_cq_depth,
4143                       max_queue_ext->max_rx_sq_depth);
4144         max_tx_queue_size = max_queue_ext->max_tx_cq_depth;
4145
4146         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
4147             max_tx_queue_size = min_t(u32, max_tx_queue_size,
4148                           llq->max_llq_depth);
4149         else
4150             max_tx_queue_size = min_t(u32, max_tx_queue_size,
4151                           max_queue_ext->max_tx_sq_depth);
4152
4153         adapter->max_tx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
4154                          max_queue_ext->max_per_packet_tx_descs);
4155         adapter->max_rx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
4156                          max_queue_ext->max_per_packet_rx_descs);
4157     } else {
4158         struct ena_admin_queue_feature_desc *max_queues =
4159             &get_feat_ctx->max_queues;
4160         max_rx_queue_size = min_t(u32, max_queues->max_cq_depth,
4161                       max_queues->max_sq_depth);
4162         max_tx_queue_size = max_queues->max_cq_depth;
4163
4164         if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
4165             max_tx_queue_size = min_t(u32, max_tx_queue_size,
4166                           llq->max_llq_depth);
4167         else
4168             max_tx_queue_size = min_t(u32, max_tx_queue_size,
4169                           max_queues->max_sq_depth);
4170
4171         adapter->max_tx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
4172                          max_queues->max_packet_tx_descs);
4173         adapter->max_rx_sgl_size = min_t(u16, ENA_PKT_MAX_BUFS,
4174                          max_queues->max_packet_rx_descs);
4175     }
4176
4177     max_tx_queue_size = rounddown_pow_of_two(max_tx_queue_size);
4178     max_rx_queue_size = rounddown_pow_of_two(max_rx_queue_size);
4179
4180     tx_queue_size = clamp_val(tx_queue_size, ENA_MIN_RING_SIZE,
4181                   max_tx_queue_size);
4182     rx_queue_size = clamp_val(rx_queue_size, ENA_MIN_RING_SIZE,
4183                   max_rx_queue_size);
4184
4185     tx_queue_size = rounddown_pow_of_two(tx_queue_size);
4186     rx_queue_size = rounddown_pow_of_two(rx_queue_size);
4187
4188     adapter->max_tx_ring_size  = max_tx_queue_size;
4189     adapter->max_rx_ring_size = max_rx_queue_size;
4190     adapter->requested_tx_ring_size = tx_queue_size;
4191     adapter->requested_rx_ring_size = rx_queue_size;
4192 }
4193
4194 /* ena_probe - Device Initialization Routine
4195  * @pdev: PCI device information struct
4196  * @ent: entry in ena_pci_tbl
4197  *
4198  * Returns 0 on success, negative on failure
4199  *
4200  * ena_probe initializes an adapter identified by a pci_dev structure.
4201  * The OS initialization, configuring of the adapter private structure,
4202  * and a hardware reset occur.
4203  */
4204 static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
4205 {
4206     struct ena_com_dev_get_features_ctx get_feat_ctx;
4207     struct ena_com_dev *ena_dev = NULL;
4208     struct ena_adapter *adapter;
4209     struct net_device *netdev;
4210     static int adapters_found;
4211     u32 max_num_io_queues;
4212     bool wd_state;
4213     int bars, rc;
4214
4215     dev_dbg(&pdev->dev, "%s\n", __func__);
4216
4217     rc = pci_enable_device_mem(pdev);
4218     if (rc) {
4219         dev_err(&pdev->dev, "pci_enable_device_mem() failed!\n");
4220         return rc;
4221     }
4222
4223     rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(ENA_MAX_PHYS_ADDR_SIZE_BITS));
4224     if (rc) {
4225         dev_err(&pdev->dev, "dma_set_mask_and_coherent failed %d\n", rc);
4226         goto err_disable_device;
4227     }
4228
4229     pci_set_master(pdev);
4230
4231     ena_dev = vzalloc(sizeof(*ena_dev));
4232     if (!ena_dev) {
4233         rc = -ENOMEM;
4234         goto err_disable_device;
4235     }
4236
4237     bars = pci_select_bars(pdev, IORESOURCE_MEM) & ENA_BAR_MASK;
4238     rc = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
4239     if (rc) {
4240         dev_err(&pdev->dev, "pci_request_selected_regions failed %d\n",
4241             rc);
4242         goto err_free_ena_dev;
4243     }
4244
4245     ena_dev->reg_bar = devm_ioremap(&pdev->dev,
4246                     pci_resource_start(pdev, ENA_REG_BAR),
4247                     pci_resource_len(pdev, ENA_REG_BAR));
4248     if (!ena_dev->reg_bar) {
4249         dev_err(&pdev->dev, "Failed to remap regs bar\n");
4250         rc = -EFAULT;
4251         goto err_free_region;
4252     }
4253
4254     ena_dev->ena_min_poll_delay_us = ENA_ADMIN_POLL_DELAY_US;
4255
4256     ena_dev->dmadev = &pdev->dev;
4257
4258     netdev = alloc_etherdev_mq(sizeof(struct ena_adapter), ENA_MAX_RINGS);
4259     if (!netdev) {
4260         dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
4261         rc = -ENOMEM;
4262         goto err_free_region;
4263     }
4264
4265     SET_NETDEV_DEV(netdev, &pdev->dev);
4266     adapter = netdev_priv(netdev);
4267     adapter->ena_dev = ena_dev;
4268     adapter->netdev = netdev;
4269     adapter->pdev = pdev;
4270     adapter->msg_enable = DEFAULT_MSG_ENABLE;
4271
4272     ena_dev->net_device = netdev;
4273
4274     pci_set_drvdata(pdev, adapter);
4275
4276     rc = ena_device_init(ena_dev, pdev, &get_feat_ctx, &wd_state);
4277     if (rc) {
4278         dev_err(&pdev->dev, "ENA device init failed\n");
4279         if (rc == -ETIME)
4280             rc = -EPROBE_DEFER;
4281         goto err_netdev_destroy;
4282     }
4283
4284     rc = ena_map_llq_mem_bar(pdev, ena_dev, bars);
4285     if (rc) {
4286         dev_err(&pdev->dev, "ENA llq bar mapping failed\n");
4287         goto err_device_destroy;
4288     }
4289
4290     /* Initial TX and RX interrupt delay. Assumes 1 usec granularity.
4291      * Updated during device initialization with the real granularity
4292      */
4293     ena_dev->intr_moder_tx_interval = ENA_INTR_INITIAL_TX_INTERVAL_USECS;
4294     ena_dev->intr_moder_rx_interval = ENA_INTR_INITIAL_RX_INTERVAL_USECS;
4295     ena_dev->intr_delay_resolution = ENA_DEFAULT_INTR_DELAY_RESOLUTION;
4296     max_num_io_queues = ena_calc_max_io_queue_num(pdev, ena_dev, &get_feat_ctx);
4297     ena_calc_io_queue_size(adapter, &get_feat_ctx);
4298     if (unlikely(!max_num_io_queues)) {
4299         rc = -EFAULT;
4300         goto err_device_destroy;
4301     }
4302
4303     ena_set_conf_feat_params(adapter, &get_feat_ctx);
4304
4305     adapter->reset_reason = ENA_REGS_RESET_NORMAL;
4306
4307     adapter->num_io_queues = max_num_io_queues;
4308     adapter->max_num_io_queues = max_num_io_queues;
4309     adapter->last_monitored_tx_qid = 0;
4310
4311     adapter->xdp_first_ring = 0;
4312     adapter->xdp_num_queues = 0;
4313
4314     adapter->rx_copybreak = ENA_DEFAULT_RX_COPYBREAK;
4315     if (ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
4316         adapter->disable_meta_caching =
4317             !!(get_feat_ctx.llq.accel_mode.u.get.supported_flags &
4318                BIT(ENA_ADMIN_DISABLE_META_CACHING));
4319
4320     adapter->wd_state = wd_state;
4321
4322     snprintf(adapter->name, ENA_NAME_MAX_LEN, "ena_%d", adapters_found);
4323
4324     rc = ena_com_init_interrupt_moderation(adapter->ena_dev);
4325     if (rc) {
4326         dev_err(&pdev->dev,
4327             "Failed to query interrupt moderation feature\n");
4328         goto err_device_destroy;
4329     }
4330     ena_init_io_rings(adapter,
4331               0,
4332               adapter->xdp_num_queues +
4333               adapter->num_io_queues);
4334
4335     netdev->netdev_ops = &ena_netdev_ops;
4336     netdev->watchdog_timeo = TX_TIMEOUT;
4337     ena_set_ethtool_ops(netdev);
4338
4339     netdev->priv_flags |= IFF_UNICAST_FLT;
4340
4341     u64_stats_init(&adapter->syncp);
4342
4343     rc = ena_enable_msix_and_set_admin_interrupts(adapter);
4344     if (rc) {
4345         dev_err(&pdev->dev,
4346             "Failed to enable and set the admin interrupts\n");
4347         goto err_worker_destroy;
4348     }
4349     rc = ena_rss_init_default(adapter);
4350     if (rc && (rc != -EOPNOTSUPP)) {
4351         dev_err(&pdev->dev, "Cannot init RSS rc: %d\n", rc);
4352         goto err_free_msix;
4353     }
4354
4355     ena_config_debug_area(adapter);
4356
4357     memcpy(adapter->netdev->perm_addr, adapter->mac_addr, netdev->addr_len);
4358
4359     netif_carrier_off(netdev);
4360
4361     rc = register_netdev(netdev);
4362     if (rc) {
4363         dev_err(&pdev->dev, "Cannot register net device\n");
4364         goto err_rss;
4365     }
4366
4367     INIT_WORK(&adapter->reset_task, ena_fw_reset_device);
4368
4369     adapter->last_keep_alive_jiffies = jiffies;
4370     adapter->keep_alive_timeout = ENA_DEVICE_KALIVE_TIMEOUT;
4371     adapter->missing_tx_completion_to = TX_TIMEOUT;
4372     adapter->missing_tx_completion_threshold = MAX_NUM_OF_TIMEOUTED_PACKETS;
4373
4374     ena_update_hints(adapter, &get_feat_ctx.hw_hints);
4375
4376     timer_setup(&adapter->timer_service, ena_timer_service, 0);
4377     mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
4378
4379     dev_info(&pdev->dev,
4380          "%s found at mem %lx, mac addr %pM\n",
4381          DEVICE_NAME, (long)pci_resource_start(pdev, 0),
4382          netdev->dev_addr);
4383
4384     set_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
4385
4386     adapters_found++;
4387
4388     return 0;
4389
4390 err_rss:
4391     ena_com_delete_debug_area(ena_dev);
4392     ena_com_rss_destroy(ena_dev);
4393 err_free_msix:
4394     ena_com_dev_reset(ena_dev, ENA_REGS_RESET_INIT_ERR);
4395     /* stop submitting admin commands on a device that was reset */
4396     ena_com_set_admin_running_state(ena_dev, false);
4397     ena_free_mgmnt_irq(adapter);
4398     ena_disable_msix(adapter);
4399 err_worker_destroy:
4400     del_timer(&adapter->timer_service);
4401 err_device_destroy:
4402     ena_com_delete_host_info(ena_dev);
4403     ena_com_admin_destroy(ena_dev);
4404 err_netdev_destroy:
4405     free_netdev(netdev);
4406 err_free_region:
4407     ena_release_bars(ena_dev, pdev);
4408 err_free_ena_dev:
4409     vfree(ena_dev);
4410 err_disable_device:
4411     pci_disable_device(pdev);
4412     return rc;
4413 }
4414
4415 /*****************************************************************************/
4416
4417 /* __ena_shutoff - Helper used in both PCI remove/shutdown routines
4418  * @pdev: PCI device information struct
4419  * @shutdown: Is it a shutdown operation? If false, means it is a removal
4420  *
4421  * __ena_shutoff is a helper routine that does the real work on shutdown and
4422  * removal paths; the difference between those paths is with regards to whether
4423  * dettach or unregister the netdevice.
4424  */
4425 static void __ena_shutoff(struct pci_dev *pdev, bool shutdown)
4426 {
4427     struct ena_adapter *adapter = pci_get_drvdata(pdev);
4428     struct ena_com_dev *ena_dev;
4429     struct net_device *netdev;
4430
4431     ena_dev = adapter->ena_dev;
4432     netdev = adapter->netdev;
4433
4434 #ifdef CONFIG_RFS_ACCEL
4435     if ((adapter->msix_vecs >= 1) && (netdev->rx_cpu_rmap)) {
4436         free_irq_cpu_rmap(netdev->rx_cpu_rmap);
4437         netdev->rx_cpu_rmap = NULL;
4438     }
4439 #endif /* CONFIG_RFS_ACCEL */
4440
4441     /* Make sure timer and reset routine won't be called after
4442      * freeing device resources.
4443      */
4444     del_timer_sync(&adapter->timer_service);
4445     cancel_work_sync(&adapter->reset_task);
4446
4447     rtnl_lock(); /* lock released inside the below if-else block */
4448     adapter->reset_reason = ENA_REGS_RESET_SHUTDOWN;
4449     ena_destroy_device(adapter, true);
4450     if (shutdown) {
4451         netif_device_detach(netdev);
4452         dev_close(netdev);
4453         rtnl_unlock();
4454     } else {
4455         rtnl_unlock();
4456         unregister_netdev(netdev);
4457         free_netdev(netdev);
4458     }
4459
4460     ena_com_rss_destroy(ena_dev);
4461
4462     ena_com_delete_debug_area(ena_dev);
4463
4464     ena_com_delete_host_info(ena_dev);
4465
4466     ena_release_bars(ena_dev, pdev);
4467
4468     pci_disable_device(pdev);
4469
4470     vfree(ena_dev);
4471 }
4472
4473 /* ena_remove - Device Removal Routine
4474  * @pdev: PCI device information struct
4475  *
4476  * ena_remove is called by the PCI subsystem to alert the driver
4477  * that it should release a PCI device.
4478  */
4479
4480 static void ena_remove(struct pci_dev *pdev)
4481 {
4482     __ena_shutoff(pdev, false);
4483 }
4484
4485 /* ena_shutdown - Device Shutdown Routine
4486  * @pdev: PCI device information struct
4487  *
4488  * ena_shutdown is called by the PCI subsystem to alert the driver that
4489  * a shutdown/reboot (or kexec) is happening and device must be disabled.
4490  */
4491
4492 static void ena_shutdown(struct pci_dev *pdev)
4493 {
4494     __ena_shutoff(pdev, true);
4495 }
4496
4497 /* ena_suspend - PM suspend callback
4498  * @dev_d: Device information struct
4499  */
4500 static int __maybe_unused ena_suspend(struct device *dev_d)
4501 {
4502     struct pci_dev *pdev = to_pci_dev(dev_d);
4503     struct ena_adapter *adapter = pci_get_drvdata(pdev);
4504
4505     ena_increase_stat(&adapter->dev_stats.suspend, 1, &adapter->syncp);
4506
4507     rtnl_lock();
4508     if (unlikely(test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags))) {
4509         dev_err(&pdev->dev,
4510             "Ignoring device reset request as the device is being suspended\n");
4511         clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
4512     }
4513     ena_destroy_device(adapter, true);
4514     rtnl_unlock();
4515     return 0;
4516 }
4517
4518 /* ena_resume - PM resume callback
4519  * @dev_d: Device information struct
4520  */
4521 static int __maybe_unused ena_resume(struct device *dev_d)
4522 {
4523     struct ena_adapter *adapter = dev_get_drvdata(dev_d);
4524     int rc;
4525
4526     ena_increase_stat(&adapter->dev_stats.resume, 1, &adapter->syncp);
4527
4528     rtnl_lock();
4529     rc = ena_restore_device(adapter);
4530     rtnl_unlock();
4531     return rc;
4532 }
4533
4534 static SIMPLE_DEV_PM_OPS(ena_pm_ops, ena_suspend, ena_resume);
4535
4536 static struct pci_driver ena_pci_driver = {
4537     .name       = DRV_MODULE_NAME,
4538     .id_table   = ena_pci_tbl,
4539     .probe      = ena_probe,
4540     .remove     = ena_remove,
4541     .shutdown   = ena_shutdown,
4542     .driver.pm  = &ena_pm_ops,
4543     .sriov_configure = pci_sriov_configure_simple,
4544 };
4545
4546 static int __init ena_init(void)
4547 {
4548     ena_wq = create_singlethread_workqueue(DRV_MODULE_NAME);
4549     if (!ena_wq) {
4550         pr_err("Failed to create workqueue\n");
4551         return -ENOMEM;
4552     }
4553
4554     return pci_register_driver(&ena_pci_driver);
4555 }
4556
4557 static void __exit ena_cleanup(void)
4558 {
4559     pci_unregister_driver(&ena_pci_driver);
4560
4561     if (ena_wq) {
4562         destroy_workqueue(ena_wq);
4563         ena_wq = NULL;
4564     }
4565 }
4566
4567 /******************************************************************************
4568  ******************************** AENQ Handlers *******************************
4569  *****************************************************************************/
4570 /* ena_update_on_link_change:
4571  * Notify the network interface about the change in link status
4572  */
4573 static void ena_update_on_link_change(void *adapter_data,
4574                       struct ena_admin_aenq_entry *aenq_e)
4575 {
4576     struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
4577     struct ena_admin_aenq_link_change_desc *aenq_desc =
4578         (struct ena_admin_aenq_link_change_desc *)aenq_e;
4579     int status = aenq_desc->flags &
4580         ENA_ADMIN_AENQ_LINK_CHANGE_DESC_LINK_STATUS_MASK;
4581
4582     if (status) {
4583         netif_dbg(adapter, ifup, adapter->netdev, "%s\n", __func__);
4584         set_bit(ENA_FLAG_LINK_UP, &adapter->flags);
4585         if (!test_bit(ENA_FLAG_ONGOING_RESET, &adapter->flags))
4586             netif_carrier_on(adapter->netdev);
4587     } else {
4588         clear_bit(ENA_FLAG_LINK_UP, &adapter->flags);
4589         netif_carrier_off(adapter->netdev);
4590     }
4591 }
4592
4593 static void ena_keep_alive_wd(void *adapter_data,
4594                   struct ena_admin_aenq_entry *aenq_e)
4595 {
4596     struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
4597     struct ena_admin_aenq_keep_alive_desc *desc;
4598     u64 rx_drops;
4599     u64 tx_drops;
4600
4601     desc = (struct ena_admin_aenq_keep_alive_desc *)aenq_e;
4602     adapter->last_keep_alive_jiffies = jiffies;
4603
4604     rx_drops = ((u64)desc->rx_drops_high << 32) | desc->rx_drops_low;
4605     tx_drops = ((u64)desc->tx_drops_high << 32) | desc->tx_drops_low;
4606
4607     u64_stats_update_begin(&adapter->syncp);
4608     /* These stats are accumulated by the device, so the counters indicate
4609      * all drops since last reset.
4610      */
4611     adapter->dev_stats.rx_drops = rx_drops;
4612     adapter->dev_stats.tx_drops = tx_drops;
4613     u64_stats_update_end(&adapter->syncp);
4614 }
4615
4616 static void ena_notification(void *adapter_data,
4617                  struct ena_admin_aenq_entry *aenq_e)
4618 {
4619     struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
4620     struct ena_admin_ena_hw_hints *hints;
4621
4622     WARN(aenq_e->aenq_common_desc.group != ENA_ADMIN_NOTIFICATION,
4623          "Invalid group(%x) expected %x\n",
4624          aenq_e->aenq_common_desc.group,
4625          ENA_ADMIN_NOTIFICATION);
4626
4627     switch (aenq_e->aenq_common_desc.syndrome) {
4628     case ENA_ADMIN_UPDATE_HINTS:
4629         hints = (struct ena_admin_ena_hw_hints *)
4630             (&aenq_e->inline_data_w4);
4631         ena_update_hints(adapter, hints);
4632         break;
4633     default:
4634         netif_err(adapter, drv, adapter->netdev,
4635               "Invalid aenq notification link state %d\n",
4636               aenq_e->aenq_common_desc.syndrome);
4637     }
4638 }
4639
4640 /* This handler will called for unknown event group or unimplemented handlers*/
4641 static void unimplemented_aenq_handler(void *data,
4642                        struct ena_admin_aenq_entry *aenq_e)
4643 {
4644     struct ena_adapter *adapter = (struct ena_adapter *)data;
4645
4646     netif_err(adapter, drv, adapter->netdev,
4647           "Unknown event was received or event with unimplemented handler\n");
4648 }
4649
4650 static struct ena_aenq_handlers aenq_handlers = {
4651     .handlers = {
4652         [ENA_ADMIN_LINK_CHANGE] = ena_update_on_link_change,
4653         [ENA_ADMIN_NOTIFICATION] = ena_notification,
4654         [ENA_ADMIN_KEEP_ALIVE] = ena_keep_alive_wd,
4655     },
4656     .unimplemented_handler = unimplemented_aenq_handler
4657 };
4658
4659 module_init(ena_init);
4660 module_exit(ena_cleanup);