drivers/net/ethernet/huawei/hinic/hinic_tx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Huawei HiNIC PCI Express Linux driver
   4  * Copyright(c) 2017 Huawei Technologies Co., Ltd
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/u64_stats_sync.h>
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/pci.h>
  13 #include <linux/device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/slab.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/smp.h>
  19 #include <asm/byteorder.h>
  20 #include <linux/ip.h>
  21 #include <linux/tcp.h>
  22 #include <linux/sctp.h>
  23 #include <linux/ipv6.h>
  24 #include <net/ipv6.h>
  25 #include <net/checksum.h>
  26 #include <net/ip6_checksum.h>
  27
  28 #include "hinic_common.h"
  29 #include "hinic_hw_if.h"
  30 #include "hinic_hw_wqe.h"
  31 #include "hinic_hw_wq.h"
  32 #include "hinic_hw_qp.h"
  33 #include "hinic_hw_dev.h"
  34 #include "hinic_dev.h"
  35 #include "hinic_tx.h"
  36
  37 #define TX_IRQ_NO_PENDING               0
  38 #define TX_IRQ_NO_COALESC               0
  39 #define TX_IRQ_NO_LLI_TIMER             0
  40 #define TX_IRQ_NO_CREDIT                0
  41 #define TX_IRQ_NO_RESEND_TIMER          0
  42
  43 #define CI_UPDATE_NO_PENDING            0
  44 #define CI_UPDATE_NO_COALESC            0
  45
  46 #define HW_CONS_IDX(sq)                 be16_to_cpu(*(u16 *)((sq)->hw_ci_addr))
  47
  48 #define MIN_SKB_LEN                     17
  49
  50 #define MAX_PAYLOAD_OFFSET              221
  51 #define TRANSPORT_OFFSET(l4_hdr, skb)   ((u32)((l4_hdr) - (skb)->data))
  52
  53 union hinic_l3 {
  54         struct iphdr *v4;
  55         struct ipv6hdr *v6;
  56         unsigned char *hdr;
  57 };
  58
  59 union hinic_l4 {
  60         struct tcphdr *tcp;
  61         struct udphdr *udp;
  62         unsigned char *hdr;
  63 };
  64
  65 enum hinic_offload_type {
  66         TX_OFFLOAD_TSO     = BIT(0),
  67         TX_OFFLOAD_CSUM    = BIT(1),
  68         TX_OFFLOAD_VLAN    = BIT(2),
  69         TX_OFFLOAD_INVALID = BIT(3),
  70 };
  71
  72 /**
  73  * hinic_txq_clean_stats - Clean the statistics of specific queue
  74  * @txq: Logical Tx Queue
  75  **/
  76 void hinic_txq_clean_stats(struct hinic_txq *txq)
  77 {
  78         struct hinic_txq_stats *txq_stats = &txq->txq_stats;
  79
  80         u64_stats_update_begin(&txq_stats->syncp);
  81         txq_stats->pkts    = 0;
  82         txq_stats->bytes   = 0;
  83         txq_stats->tx_busy = 0;
  84         txq_stats->tx_wake = 0;
  85         txq_stats->tx_dropped = 0;
  86         txq_stats->big_frags_pkts = 0;
  87         u64_stats_update_end(&txq_stats->syncp);
  88 }
  89
  90 /**
  91  * hinic_txq_get_stats - get statistics of Tx Queue
  92  * @txq: Logical Tx Queue
  93  * @stats: return updated stats here
  94  **/
  95 void hinic_txq_get_stats(struct hinic_txq *txq, struct hinic_txq_stats *stats)
  96 {
  97         struct hinic_txq_stats *txq_stats = &txq->txq_stats;
  98         unsigned int start;
  99
 100         u64_stats_update_begin(&stats->syncp);
 101         do {
 102                 start = u64_stats_fetch_begin(&txq_stats->syncp);
 103                 stats->pkts    = txq_stats->pkts;
 104                 stats->bytes   = txq_stats->bytes;
 105                 stats->tx_busy = txq_stats->tx_busy;
 106                 stats->tx_wake = txq_stats->tx_wake;
 107                 stats->tx_dropped = txq_stats->tx_dropped;
 108                 stats->big_frags_pkts = txq_stats->big_frags_pkts;
 109         } while (u64_stats_fetch_retry(&txq_stats->syncp, start));
 110         u64_stats_update_end(&stats->syncp);
 111 }
 112
 113 /**
 114  * txq_stats_init - Initialize the statistics of specific queue
 115  * @txq: Logical Tx Queue
 116  **/
 117 static void txq_stats_init(struct hinic_txq *txq)
 118 {
 119         struct hinic_txq_stats *txq_stats = &txq->txq_stats;
 120
 121         u64_stats_init(&txq_stats->syncp);
 122         hinic_txq_clean_stats(txq);
 123 }
 124
 125 /**
 126  * tx_map_skb - dma mapping for skb and return sges
 127  * @nic_dev: nic device
 128  * @skb: the skb
 129  * @sges: returned sges
 130  *
 131  * Return 0 - Success, negative - Failure
 132  **/
 133 static int tx_map_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
 134                       struct hinic_sge *sges)
 135 {
 136         struct hinic_hwdev *hwdev = nic_dev->hwdev;
 137         struct hinic_hwif *hwif = hwdev->hwif;
 138         struct pci_dev *pdev = hwif->pdev;
 139         skb_frag_t *frag;
 140         dma_addr_t dma_addr;
 141         int i, j;
 142
 143         dma_addr = dma_map_single(&pdev->dev, skb->data, skb_headlen(skb),
 144                                   DMA_TO_DEVICE);
 145         if (dma_mapping_error(&pdev->dev, dma_addr)) {
 146                 dev_err(&pdev->dev, "Failed to map Tx skb data\n");
 147                 return -EFAULT;
 148         }
 149
 150         hinic_set_sge(&sges[0], dma_addr, skb_headlen(skb));
 151
 152         for (i = 0 ; i < skb_shinfo(skb)->nr_frags; i++) {
 153                 frag = &skb_shinfo(skb)->frags[i];
 154
 155                 dma_addr = skb_frag_dma_map(&pdev->dev, frag, 0,
 156                                             skb_frag_size(frag),
 157                                             DMA_TO_DEVICE);
 158                 if (dma_mapping_error(&pdev->dev, dma_addr)) {
 159                         dev_err(&pdev->dev, "Failed to map Tx skb frag\n");
 160                         goto err_tx_map;
 161                 }
 162
 163                 hinic_set_sge(&sges[i + 1], dma_addr, skb_frag_size(frag));
 164         }
 165
 166         return 0;
 167
 168 err_tx_map:
 169         for (j = 0; j < i; j++)
 170                 dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[j + 1]),
 171                                sges[j + 1].len, DMA_TO_DEVICE);
 172
 173         dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
 174                          DMA_TO_DEVICE);
 175         return -EFAULT;
 176 }
 177
 178 /**
 179  * tx_unmap_skb - unmap the dma address of the skb
 180  * @nic_dev: nic device
 181  * @skb: the skb
 182  * @sges: the sges that are connected to the skb
 183  **/
 184 static void tx_unmap_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
 185                          struct hinic_sge *sges)
 186 {
 187         struct hinic_hwdev *hwdev = nic_dev->hwdev;
 188         struct hinic_hwif *hwif = hwdev->hwif;
 189         struct pci_dev *pdev = hwif->pdev;
 190         int i;
 191
 192         for (i = 0; i < skb_shinfo(skb)->nr_frags ; i++)
 193                 dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[i + 1]),
 194                                sges[i + 1].len, DMA_TO_DEVICE);
 195
 196         dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
 197                          DMA_TO_DEVICE);
 198 }
 199
 200 static void get_inner_l3_l4_type(struct sk_buff *skb, union hinic_l3 *ip,
 201                                  union hinic_l4 *l4,
 202                                  enum hinic_offload_type offload_type,
 203                                  enum hinic_l3_offload_type *l3_type,
 204                                  u8 *l4_proto)
 205 {
 206         u8 *exthdr;
 207
 208         if (ip->v4->version == 4) {
 209                 *l3_type = (offload_type == TX_OFFLOAD_CSUM) ?
 210                            IPV4_PKT_NO_CHKSUM_OFFLOAD :
 211                            IPV4_PKT_WITH_CHKSUM_OFFLOAD;
 212                 *l4_proto = ip->v4->protocol;
 213         } else if (ip->v4->version == 6) {
 214                 *l3_type = IPV6_PKT;
 215                 exthdr = ip->hdr + sizeof(*ip->v6);
 216                 *l4_proto = ip->v6->nexthdr;
 217                 if (exthdr != l4->hdr) {
 218                         int start = exthdr - skb->data;
 219                         __be16 frag_off;
 220
 221                         ipv6_skip_exthdr(skb, start, l4_proto, &frag_off);
 222                 }
 223         } else {
 224                 *l3_type = L3TYPE_UNKNOWN;
 225                 *l4_proto = 0;
 226         }
 227 }
 228
 229 static void get_inner_l4_info(struct sk_buff *skb, union hinic_l4 *l4,
 230                               enum hinic_offload_type offload_type, u8 l4_proto,
 231                               enum hinic_l4_offload_type *l4_offload,
 232                               u32 *l4_len, u32 *offset)
 233 {
 234         *l4_offload = OFFLOAD_DISABLE;
 235         *offset = 0;
 236         *l4_len = 0;
 237
 238         switch (l4_proto) {
 239         case IPPROTO_TCP:
 240                 *l4_offload = TCP_OFFLOAD_ENABLE;
 241                 /* doff in unit of 4B */
 242                 *l4_len = l4->tcp->doff * 4;
 243                 *offset = *l4_len + TRANSPORT_OFFSET(l4->hdr, skb);
 244                 break;
 245
 246         case IPPROTO_UDP:
 247                 *l4_offload = UDP_OFFLOAD_ENABLE;
 248                 *l4_len = sizeof(struct udphdr);
 249                 *offset = TRANSPORT_OFFSET(l4->hdr, skb);
 250                 break;
 251
 252         case IPPROTO_SCTP:
 253                 /* only csum offload support sctp */
 254                 if (offload_type != TX_OFFLOAD_CSUM)
 255                         break;
 256
 257                 *l4_offload = SCTP_OFFLOAD_ENABLE;
 258                 *l4_len = sizeof(struct sctphdr);
 259                 *offset = TRANSPORT_OFFSET(l4->hdr, skb);
 260                 break;
 261
 262         default:
 263                 break;
 264         }
 265 }
 266
 267 static __sum16 csum_magic(union hinic_l3 *ip, unsigned short proto)
 268 {
 269         return (ip->v4->version == 4) ?
 270                 csum_tcpudp_magic(ip->v4->saddr, ip->v4->daddr, 0, proto, 0) :
 271                 csum_ipv6_magic(&ip->v6->saddr, &ip->v6->daddr, 0, proto, 0);
 272 }
 273
 274 static int offload_tso(struct hinic_sq_task *task, u32 *queue_info,
 275                        struct sk_buff *skb)
 276 {
 277         u32 offset, l4_len, ip_identify, network_hdr_len;
 278         enum hinic_l3_offload_type l3_offload;
 279         enum hinic_l4_offload_type l4_offload;
 280         union hinic_l3 ip;
 281         union hinic_l4 l4;
 282         u8 l4_proto;
 283
 284         if (!skb_is_gso(skb))
 285                 return 0;
 286
 287         if (skb_cow_head(skb, 0) < 0)
 288                 return -EPROTONOSUPPORT;
 289
 290         if (skb->encapsulation) {
 291                 u32 gso_type = skb_shinfo(skb)->gso_type;
 292                 u32 tunnel_type = 0;
 293                 u32 l4_tunnel_len;
 294
 295                 ip.hdr = skb_network_header(skb);
 296                 l4.hdr = skb_transport_header(skb);
 297                 network_hdr_len = skb_inner_network_header_len(skb);
 298
 299                 if (ip.v4->version == 4) {
 300                         ip.v4->tot_len = 0;
 301                         l3_offload = IPV4_PKT_WITH_CHKSUM_OFFLOAD;
 302                 } else if (ip.v4->version == 6) {
 303                         l3_offload = IPV6_PKT;
 304                 } else {
 305                         l3_offload = 0;
 306                 }
 307
 308                 hinic_task_set_outter_l3(task, l3_offload,
 309                                          skb_network_header_len(skb));
 310
 311                 if (gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
 312                         l4.udp->check = ~csum_magic(&ip, IPPROTO_UDP);
 313                         tunnel_type = TUNNEL_UDP_CSUM;
 314                 } else if (gso_type & SKB_GSO_UDP_TUNNEL) {
 315                         tunnel_type = TUNNEL_UDP_NO_CSUM;
 316                 }
 317
 318                 l4_tunnel_len = skb_inner_network_offset(skb) -
 319                                 skb_transport_offset(skb);
 320                 hinic_task_set_tunnel_l4(task, tunnel_type, l4_tunnel_len);
 321
 322                 ip.hdr = skb_inner_network_header(skb);
 323                 l4.hdr = skb_inner_transport_header(skb);
 324         } else {
 325                 ip.hdr = skb_network_header(skb);
 326                 l4.hdr = skb_transport_header(skb);
 327                 network_hdr_len = skb_network_header_len(skb);
 328         }
 329
 330         /* initialize inner IP header fields */
 331         if (ip.v4->version == 4)
 332                 ip.v4->tot_len = 0;
 333         else
 334                 ip.v6->payload_len = 0;
 335
 336         get_inner_l3_l4_type(skb, &ip, &l4, TX_OFFLOAD_TSO, &l3_offload,
 337                              &l4_proto);
 338
 339         hinic_task_set_inner_l3(task, l3_offload, network_hdr_len);
 340
 341         ip_identify = 0;
 342         if (l4_proto == IPPROTO_TCP)
 343                 l4.tcp->check = ~csum_magic(&ip, IPPROTO_TCP);
 344
 345         get_inner_l4_info(skb, &l4, TX_OFFLOAD_TSO, l4_proto, &l4_offload,
 346                           &l4_len, &offset);
 347
 348         hinic_set_tso_inner_l4(task, queue_info, l4_offload, l4_len, offset,
 349                                ip_identify, skb_shinfo(skb)->gso_size);
 350
 351         return 1;
 352 }
 353
 354 static int offload_csum(struct hinic_sq_task *task, u32 *queue_info,
 355                         struct sk_buff *skb)
 356 {
 357         enum hinic_l4_offload_type l4_offload;
 358         u32 offset, l4_len, network_hdr_len;
 359         enum hinic_l3_offload_type l3_type;
 360         union hinic_l3 ip;
 361         union hinic_l4 l4;
 362         u8 l4_proto;
 363
 364         if (skb->ip_summed != CHECKSUM_PARTIAL)
 365                 return 0;
 366
 367         if (skb->encapsulation) {
 368                 u32 l4_tunnel_len;
 369
 370                 ip.hdr = skb_network_header(skb);
 371
 372                 if (ip.v4->version == 4)
 373                         l3_type = IPV4_PKT_NO_CHKSUM_OFFLOAD;
 374                 else if (ip.v4->version == 6)
 375                         l3_type = IPV6_PKT;
 376                 else
 377                         l3_type = L3TYPE_UNKNOWN;
 378
 379                 hinic_task_set_outter_l3(task, l3_type,
 380                                          skb_network_header_len(skb));
 381
 382                 l4_tunnel_len = skb_inner_network_offset(skb) -
 383                                 skb_transport_offset(skb);
 384
 385                 hinic_task_set_tunnel_l4(task, TUNNEL_UDP_NO_CSUM,
 386                                          l4_tunnel_len);
 387
 388                 ip.hdr = skb_inner_network_header(skb);
 389                 l4.hdr = skb_inner_transport_header(skb);
 390                 network_hdr_len = skb_inner_network_header_len(skb);
 391         } else {
 392                 ip.hdr = skb_network_header(skb);
 393                 l4.hdr = skb_transport_header(skb);
 394                 network_hdr_len = skb_network_header_len(skb);
 395         }
 396
 397         get_inner_l3_l4_type(skb, &ip, &l4, TX_OFFLOAD_CSUM, &l3_type,
 398                              &l4_proto);
 399
 400         hinic_task_set_inner_l3(task, l3_type, network_hdr_len);
 401
 402         get_inner_l4_info(skb, &l4, TX_OFFLOAD_CSUM, l4_proto, &l4_offload,
 403                           &l4_len, &offset);
 404
 405         hinic_set_cs_inner_l4(task, queue_info, l4_offload, l4_len, offset);
 406
 407         return 1;
 408 }
 409
 410 static void offload_vlan(struct hinic_sq_task *task, u32 *queue_info,
 411                          u16 vlan_tag, u16 vlan_pri)
 412 {
 413         task->pkt_info0 |= HINIC_SQ_TASK_INFO0_SET(vlan_tag, VLAN_TAG) |
 414                                 HINIC_SQ_TASK_INFO0_SET(1U, VLAN_OFFLOAD);
 415
 416         *queue_info |= HINIC_SQ_CTRL_SET(vlan_pri, QUEUE_INFO_PRI);
 417 }
 418
 419 static int hinic_tx_offload(struct sk_buff *skb, struct hinic_sq_task *task,
 420                             u32 *queue_info)
 421 {
 422         enum hinic_offload_type offload = 0;
 423         u16 vlan_tag;
 424         int enabled;
 425
 426         enabled = offload_tso(task, queue_info, skb);
 427         if (enabled > 0) {
 428                 offload |= TX_OFFLOAD_TSO;
 429         } else if (enabled == 0) {
 430                 enabled = offload_csum(task, queue_info, skb);
 431                 if (enabled)
 432                         offload |= TX_OFFLOAD_CSUM;
 433         } else {
 434                 return -EPROTONOSUPPORT;
 435         }
 436
 437         if (unlikely(skb_vlan_tag_present(skb))) {
 438                 vlan_tag = skb_vlan_tag_get(skb);
 439                 offload_vlan(task, queue_info, vlan_tag,
 440                              vlan_tag >> VLAN_PRIO_SHIFT);
 441                 offload |= TX_OFFLOAD_VLAN;
 442         }
 443
 444         if (offload)
 445                 hinic_task_set_l2hdr(task, skb_network_offset(skb));
 446
 447         /* payload offset should not more than 221 */
 448         if (HINIC_SQ_CTRL_GET(*queue_info, QUEUE_INFO_PLDOFF) >
 449             MAX_PAYLOAD_OFFSET) {
 450                 return -EPROTONOSUPPORT;
 451         }
 452
 453         /* mss should not less than 80 */
 454         if (HINIC_SQ_CTRL_GET(*queue_info, QUEUE_INFO_MSS) < HINIC_MSS_MIN) {
 455                 *queue_info = HINIC_SQ_CTRL_CLEAR(*queue_info, QUEUE_INFO_MSS);
 456                 *queue_info |= HINIC_SQ_CTRL_SET(HINIC_MSS_MIN, QUEUE_INFO_MSS);
 457         }
 458
 459         return 0;
 460 }
 461
 462 netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 463 {
 464         struct hinic_dev *nic_dev = netdev_priv(netdev);
 465         u16 prod_idx, q_id = skb->queue_mapping;
 466         struct netdev_queue *netdev_txq;
 467         int nr_sges, err = NETDEV_TX_OK;
 468         struct hinic_sq_wqe *sq_wqe;
 469         unsigned int wqe_size;
 470         struct hinic_txq *txq;
 471         struct hinic_qp *qp;
 472
 473         txq = &nic_dev->txqs[q_id];
 474         qp = container_of(txq->sq, struct hinic_qp, sq);
 475
 476         if (skb->len < MIN_SKB_LEN) {
 477                 if (skb_pad(skb, MIN_SKB_LEN - skb->len)) {
 478                         netdev_err(netdev, "Failed to pad skb\n");
 479                         goto update_error_stats;
 480                 }
 481
 482                 skb->len = MIN_SKB_LEN;
 483         }
 484
 485         nr_sges = skb_shinfo(skb)->nr_frags + 1;
 486         if (nr_sges > 17) {
 487                 u64_stats_update_begin(&txq->txq_stats.syncp);
 488                 txq->txq_stats.big_frags_pkts++;
 489                 u64_stats_update_end(&txq->txq_stats.syncp);
 490         }
 491
 492         if (nr_sges > txq->max_sges) {
 493                 netdev_err(netdev, "Too many Tx sges\n");
 494                 goto skb_error;
 495         }
 496
 497         err = tx_map_skb(nic_dev, skb, txq->sges);
 498         if (err)
 499                 goto skb_error;
 500
 501         wqe_size = HINIC_SQ_WQE_SIZE(nr_sges);
 502
 503         sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
 504         if (!sq_wqe) {
 505                 netif_stop_subqueue(netdev, qp->q_id);
 506
 507                 /* Check for the case free_tx_poll is called in another cpu
 508                  * and we stopped the subqueue after free_tx_poll check.
 509                  */
 510                 sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
 511                 if (sq_wqe) {
 512                         netif_wake_subqueue(nic_dev->netdev, qp->q_id);
 513                         goto process_sq_wqe;
 514                 }
 515
 516                 tx_unmap_skb(nic_dev, skb, txq->sges);
 517
 518                 u64_stats_update_begin(&txq->txq_stats.syncp);
 519                 txq->txq_stats.tx_busy++;
 520                 u64_stats_update_end(&txq->txq_stats.syncp);
 521                 err = NETDEV_TX_BUSY;
 522                 wqe_size = 0;
 523                 goto flush_skbs;
 524         }
 525
 526 process_sq_wqe:
 527         hinic_sq_prepare_wqe(txq->sq, prod_idx, sq_wqe, txq->sges, nr_sges);
 528
 529         err = hinic_tx_offload(skb, &sq_wqe->task, &sq_wqe->ctrl.queue_info);
 530         if (err)
 531                 goto offload_error;
 532
 533         hinic_sq_write_wqe(txq->sq, prod_idx, sq_wqe, skb, wqe_size);
 534
 535 flush_skbs:
 536         netdev_txq = netdev_get_tx_queue(netdev, q_id);
 537         if ((!netdev_xmit_more()) || (netif_xmit_stopped(netdev_txq)))
 538                 hinic_sq_write_db(txq->sq, prod_idx, wqe_size, 0);
 539
 540         return err;
 541
 542 offload_error:
 543         hinic_sq_return_wqe(txq->sq, wqe_size);
 544         tx_unmap_skb(nic_dev, skb, txq->sges);
 545
 546 skb_error:
 547         dev_kfree_skb_any(skb);
 548
 549 update_error_stats:
 550         u64_stats_update_begin(&txq->txq_stats.syncp);
 551         txq->txq_stats.tx_dropped++;
 552         u64_stats_update_end(&txq->txq_stats.syncp);
 553
 554         return NETDEV_TX_OK;
 555 }
 556
 557 /**
 558  * tx_free_skb - unmap and free skb
 559  * @nic_dev: nic device
 560  * @skb: the skb
 561  * @sges: the sges that are connected to the skb
 562  **/
 563 static void tx_free_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
 564                         struct hinic_sge *sges)
 565 {
 566         tx_unmap_skb(nic_dev, skb, sges);
 567
 568         dev_kfree_skb_any(skb);
 569 }
 570
 571 /**
 572  * free_all_rx_skbs - free all skbs in tx queue
 573  * @txq: tx queue
 574  **/
 575 static void free_all_tx_skbs(struct hinic_txq *txq)
 576 {
 577         struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
 578         struct hinic_sq *sq = txq->sq;
 579         struct hinic_sq_wqe *sq_wqe;
 580         unsigned int wqe_size;
 581         struct sk_buff *skb;
 582         int nr_sges;
 583         u16 ci;
 584
 585         while ((sq_wqe = hinic_sq_read_wqebb(sq, &skb, &wqe_size, &ci))) {
 586                 sq_wqe = hinic_sq_read_wqe(sq, &skb, wqe_size, &ci);
 587                 if (!sq_wqe)
 588                         break;
 589
 590                 nr_sges = skb_shinfo(skb)->nr_frags + 1;
 591
 592                 hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);
 593
 594                 hinic_sq_put_wqe(sq, wqe_size);
 595
 596                 tx_free_skb(nic_dev, skb, txq->free_sges);
 597         }
 598 }
 599
 600 /**
 601  * free_tx_poll - free finished tx skbs in tx queue that connected to napi
 602  * @napi: napi
 603  * @budget: number of tx
 604  *
 605  * Return 0 - Success, negative - Failure
 606  **/
 607 static int free_tx_poll(struct napi_struct *napi, int budget)
 608 {
 609         struct hinic_txq *txq = container_of(napi, struct hinic_txq, napi);
 610         struct hinic_qp *qp = container_of(txq->sq, struct hinic_qp, sq);
 611         struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
 612         struct netdev_queue *netdev_txq;
 613         struct hinic_sq *sq = txq->sq;
 614         struct hinic_wq *wq = sq->wq;
 615         struct hinic_sq_wqe *sq_wqe;
 616         unsigned int wqe_size;
 617         int nr_sges, pkts = 0;
 618         struct sk_buff *skb;
 619         u64 tx_bytes = 0;
 620         u16 hw_ci, sw_ci;
 621
 622         do {
 623                 hw_ci = HW_CONS_IDX(sq) & wq->mask;
 624
 625                 /* Reading a WQEBB to get real WQE size and consumer index. */
 626                 sq_wqe = hinic_sq_read_wqebb(sq, &skb, &wqe_size, &sw_ci);
 627                 if ((!sq_wqe) ||
 628                     (((hw_ci - sw_ci) & wq->mask) * wq->wqebb_size < wqe_size))
 629                         break;
 630
 631                 /* If this WQE have multiple WQEBBs, we will read again to get
 632                  * full size WQE.
 633                  */
 634                 if (wqe_size > wq->wqebb_size) {
 635                         sq_wqe = hinic_sq_read_wqe(sq, &skb, wqe_size, &sw_ci);
 636                         if (unlikely(!sq_wqe))
 637                                 break;
 638                 }
 639
 640                 tx_bytes += skb->len;
 641                 pkts++;
 642
 643                 nr_sges = skb_shinfo(skb)->nr_frags + 1;
 644
 645                 hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);
 646
 647                 hinic_sq_put_wqe(sq, wqe_size);
 648
 649                 tx_free_skb(nic_dev, skb, txq->free_sges);
 650         } while (pkts < budget);
 651
 652         if (__netif_subqueue_stopped(nic_dev->netdev, qp->q_id) &&
 653             hinic_get_sq_free_wqebbs(sq) >= HINIC_MIN_TX_NUM_WQEBBS(sq)) {
 654                 netdev_txq = netdev_get_tx_queue(txq->netdev, qp->q_id);
 655
 656                 __netif_tx_lock(netdev_txq, smp_processor_id());
 657
 658                 netif_wake_subqueue(nic_dev->netdev, qp->q_id);
 659
 660                 __netif_tx_unlock(netdev_txq);
 661
 662                 u64_stats_update_begin(&txq->txq_stats.syncp);
 663                 txq->txq_stats.tx_wake++;
 664                 u64_stats_update_end(&txq->txq_stats.syncp);
 665         }
 666
 667         u64_stats_update_begin(&txq->txq_stats.syncp);
 668         txq->txq_stats.bytes += tx_bytes;
 669         txq->txq_stats.pkts += pkts;
 670         u64_stats_update_end(&txq->txq_stats.syncp);
 671
 672         if (pkts < budget) {
 673                 napi_complete(napi);
 674                 hinic_hwdev_set_msix_state(nic_dev->hwdev,
 675                                            sq->msix_entry,
 676                                            HINIC_MSIX_ENABLE);
 677                 return pkts;
 678         }
 679
 680         return budget;
 681 }
 682
 683 static void tx_napi_add(struct hinic_txq *txq, int weight)
 684 {
 685         netif_napi_add(txq->netdev, &txq->napi, free_tx_poll, weight);
 686         napi_enable(&txq->napi);
 687 }
 688
 689 static void tx_napi_del(struct hinic_txq *txq)
 690 {
 691         napi_disable(&txq->napi);
 692         netif_napi_del(&txq->napi);
 693 }
 694
 695 static irqreturn_t tx_irq(int irq, void *data)
 696 {
 697         struct hinic_txq *txq = data;
 698         struct hinic_dev *nic_dev;
 699
 700         nic_dev = netdev_priv(txq->netdev);
 701
 702         /* Disable the interrupt until napi will be completed */
 703         hinic_hwdev_set_msix_state(nic_dev->hwdev,
 704                                    txq->sq->msix_entry,
 705                                    HINIC_MSIX_DISABLE);
 706
 707         hinic_hwdev_msix_cnt_set(nic_dev->hwdev, txq->sq->msix_entry);
 708
 709         napi_schedule(&txq->napi);
 710         return IRQ_HANDLED;
 711 }
 712
 713 static int tx_request_irq(struct hinic_txq *txq)
 714 {
 715         struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
 716         struct hinic_hwdev *hwdev = nic_dev->hwdev;
 717         struct hinic_hwif *hwif = hwdev->hwif;
 718         struct pci_dev *pdev = hwif->pdev;
 719         struct hinic_sq *sq = txq->sq;
 720         int err;
 721
 722         tx_napi_add(txq, nic_dev->tx_weight);
 723
 724         hinic_hwdev_msix_set(nic_dev->hwdev, sq->msix_entry,
 725                              TX_IRQ_NO_PENDING, TX_IRQ_NO_COALESC,
 726                              TX_IRQ_NO_LLI_TIMER, TX_IRQ_NO_CREDIT,
 727                              TX_IRQ_NO_RESEND_TIMER);
 728
 729         err = request_irq(sq->irq, tx_irq, 0, txq->irq_name, txq);
 730         if (err) {
 731                 dev_err(&pdev->dev, "Failed to request Tx irq\n");
 732                 tx_napi_del(txq);
 733                 return err;
 734         }
 735
 736         return 0;
 737 }
 738
 739 static void tx_free_irq(struct hinic_txq *txq)
 740 {
 741         struct hinic_sq *sq = txq->sq;
 742
 743         free_irq(sq->irq, txq);
 744         tx_napi_del(txq);
 745 }
 746
 747 /**
 748  * hinic_init_txq - Initialize the Tx Queue
 749  * @txq: Logical Tx Queue
 750  * @sq: Hardware Tx Queue to connect the Logical queue with
 751  * @netdev: network device to connect the Logical queue with
 752  *
 753  * Return 0 - Success, negative - Failure
 754  **/
 755 int hinic_init_txq(struct hinic_txq *txq, struct hinic_sq *sq,
 756                    struct net_device *netdev)
 757 {
 758         struct hinic_qp *qp = container_of(sq, struct hinic_qp, sq);
 759         struct hinic_dev *nic_dev = netdev_priv(netdev);
 760         struct hinic_hwdev *hwdev = nic_dev->hwdev;
 761         int err, irqname_len;
 762         size_t sges_size;
 763
 764         txq->netdev = netdev;
 765         txq->sq = sq;
 766
 767         txq_stats_init(txq);
 768
 769         txq->max_sges = HINIC_MAX_SQ_BUFDESCS;
 770
 771         sges_size = txq->max_sges * sizeof(*txq->sges);
 772         txq->sges = devm_kzalloc(&netdev->dev, sges_size, GFP_KERNEL);
 773         if (!txq->sges)
 774                 return -ENOMEM;
 775
 776         sges_size = txq->max_sges * sizeof(*txq->free_sges);
 777         txq->free_sges = devm_kzalloc(&netdev->dev, sges_size, GFP_KERNEL);
 778         if (!txq->free_sges) {
 779                 err = -ENOMEM;
 780                 goto err_alloc_free_sges;
 781         }
 782
 783         irqname_len = snprintf(NULL, 0, "hinic_txq%d", qp->q_id) + 1;
 784         txq->irq_name = devm_kzalloc(&netdev->dev, irqname_len, GFP_KERNEL);
 785         if (!txq->irq_name) {
 786                 err = -ENOMEM;
 787                 goto err_alloc_irqname;
 788         }
 789
 790         sprintf(txq->irq_name, "hinic_txq%d", qp->q_id);
 791
 792         err = hinic_hwdev_hw_ci_addr_set(hwdev, sq, CI_UPDATE_NO_PENDING,
 793                                          CI_UPDATE_NO_COALESC);
 794         if (err)
 795                 goto err_hw_ci;
 796
 797         err = tx_request_irq(txq);
 798         if (err) {
 799                 netdev_err(netdev, "Failed to request Tx irq\n");
 800                 goto err_req_tx_irq;
 801         }
 802
 803         return 0;
 804
 805 err_req_tx_irq:
 806 err_hw_ci:
 807         devm_kfree(&netdev->dev, txq->irq_name);
 808
 809 err_alloc_irqname:
 810         devm_kfree(&netdev->dev, txq->free_sges);
 811
 812 err_alloc_free_sges:
 813         devm_kfree(&netdev->dev, txq->sges);
 814         return err;
 815 }
 816
 817 /**
 818  * hinic_clean_txq - Clean the Tx Queue
 819  * @txq: Logical Tx Queue
 820  **/
 821 void hinic_clean_txq(struct hinic_txq *txq)
 822 {
 823         struct net_device *netdev = txq->netdev;
 824
 825         tx_free_irq(txq);
 826
 827         free_all_tx_skbs(txq);
 828
 829         devm_kfree(&netdev->dev, txq->irq_name);
 830         devm_kfree(&netdev->dev, txq->free_sges);
 831         devm_kfree(&netdev->dev, txq->sges);
 832 }