drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

   1 /*
   2  * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/ip.h>
  34 #include <linux/ipv6.h>
  35 #include <linux/tcp.h>
  36 #include <net/busy_poll.h>
  37 #include "en.h"
  38 #include "en_tc.h"
  39
  40 static inline bool mlx5e_rx_hw_stamp(struct mlx5e_tstamp *tstamp)
  41 {
  42         return tstamp->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL;
  43 }
  44
  45 static inline void mlx5e_read_cqe_slot(struct mlx5e_cq *cq, u32 cqcc,
  46                                        void *data)
  47 {
  48         u32 ci = cqcc & cq->wq.sz_m1;
  49
  50         memcpy(data, mlx5_cqwq_get_wqe(&cq->wq, ci), sizeof(struct mlx5_cqe64));
  51 }
  52
  53 static inline void mlx5e_read_title_slot(struct mlx5e_rq *rq,
  54                                          struct mlx5e_cq *cq, u32 cqcc)
  55 {
  56         mlx5e_read_cqe_slot(cq, cqcc, &cq->title);
  57         cq->decmprs_left        = be32_to_cpu(cq->title.byte_cnt);
  58         cq->decmprs_wqe_counter = be16_to_cpu(cq->title.wqe_counter);
  59         rq->stats.cqe_compress_blks++;
  60 }
  61
  62 static inline void mlx5e_read_mini_arr_slot(struct mlx5e_cq *cq, u32 cqcc)
  63 {
  64         mlx5e_read_cqe_slot(cq, cqcc, cq->mini_arr);
  65         cq->mini_arr_idx = 0;
  66 }
  67
  68 static inline void mlx5e_cqes_update_owner(struct mlx5e_cq *cq, u32 cqcc, int n)
  69 {
  70         u8 op_own = (cqcc >> cq->wq.log_sz) & 1;
  71         u32 wq_sz = 1 << cq->wq.log_sz;
  72         u32 ci = cqcc & cq->wq.sz_m1;
  73         u32 ci_top = min_t(u32, wq_sz, ci + n);
  74
  75         for (; ci < ci_top; ci++, n--) {
  76                 struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(&cq->wq, ci);
  77
  78                 cqe->op_own = op_own;
  79         }
  80
  81         if (unlikely(ci == wq_sz)) {
  82                 op_own = !op_own;
  83                 for (ci = 0; ci < n; ci++) {
  84                         struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(&cq->wq, ci);
  85
  86                         cqe->op_own = op_own;
  87                 }
  88         }
  89 }
  90
  91 static inline void mlx5e_decompress_cqe(struct mlx5e_rq *rq,
  92                                         struct mlx5e_cq *cq, u32 cqcc)
  93 {
  94         u16 wqe_cnt_step;
  95
  96         cq->title.byte_cnt     = cq->mini_arr[cq->mini_arr_idx].byte_cnt;
  97         cq->title.check_sum    = cq->mini_arr[cq->mini_arr_idx].checksum;
  98         cq->title.op_own      &= 0xf0;
  99         cq->title.op_own      |= 0x01 & (cqcc >> cq->wq.log_sz);
 100         cq->title.wqe_counter  = cpu_to_be16(cq->decmprs_wqe_counter);
 101
 102         wqe_cnt_step =
 103                 rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ ?
 104                 mpwrq_get_cqe_consumed_strides(&cq->title) : 1;
 105         cq->decmprs_wqe_counter =
 106                 (cq->decmprs_wqe_counter + wqe_cnt_step) & rq->wq.sz_m1;
 107 }
 108
 109 static inline void mlx5e_decompress_cqe_no_hash(struct mlx5e_rq *rq,
 110                                                 struct mlx5e_cq *cq, u32 cqcc)
 111 {
 112         mlx5e_decompress_cqe(rq, cq, cqcc);
 113         cq->title.rss_hash_type   = 0;
 114         cq->title.rss_hash_result = 0;
 115 }
 116
 117 static inline u32 mlx5e_decompress_cqes_cont(struct mlx5e_rq *rq,
 118                                              struct mlx5e_cq *cq,
 119                                              int update_owner_only,
 120                                              int budget_rem)
 121 {
 122         u32 cqcc = cq->wq.cc + update_owner_only;
 123         u32 cqe_count;
 124         u32 i;
 125
 126         cqe_count = min_t(u32, cq->decmprs_left, budget_rem);
 127
 128         for (i = update_owner_only; i < cqe_count;
 129              i++, cq->mini_arr_idx++, cqcc++) {
 130                 if (cq->mini_arr_idx == MLX5_MINI_CQE_ARRAY_SIZE)
 131                         mlx5e_read_mini_arr_slot(cq, cqcc);
 132
 133                 mlx5e_decompress_cqe_no_hash(rq, cq, cqcc);
 134                 rq->handle_rx_cqe(rq, &cq->title);
 135         }
 136         mlx5e_cqes_update_owner(cq, cq->wq.cc, cqcc - cq->wq.cc);
 137         cq->wq.cc = cqcc;
 138         cq->decmprs_left -= cqe_count;
 139         rq->stats.cqe_compress_pkts += cqe_count;
 140
 141         return cqe_count;
 142 }
 143
 144 static inline u32 mlx5e_decompress_cqes_start(struct mlx5e_rq *rq,
 145                                               struct mlx5e_cq *cq,
 146                                               int budget_rem)
 147 {
 148         mlx5e_read_title_slot(rq, cq, cq->wq.cc);
 149         mlx5e_read_mini_arr_slot(cq, cq->wq.cc + 1);
 150         mlx5e_decompress_cqe(rq, cq, cq->wq.cc);
 151         rq->handle_rx_cqe(rq, &cq->title);
 152         cq->mini_arr_idx++;
 153
 154         return mlx5e_decompress_cqes_cont(rq, cq, 1, budget_rem) - 1;
 155 }
 156
 157 void mlx5e_modify_rx_cqe_compression(struct mlx5e_priv *priv, bool val)
 158 {
 159         bool was_opened;
 160
 161         if (!MLX5_CAP_GEN(priv->mdev, cqe_compression))
 162                 return;
 163
 164         mutex_lock(&priv->state_lock);
 165
 166         if (priv->params.rx_cqe_compress == val)
 167                 goto unlock;
 168
 169         was_opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
 170         if (was_opened)
 171                 mlx5e_close_locked(priv->netdev);
 172
 173         priv->params.rx_cqe_compress = val;
 174
 175         if (was_opened)
 176                 mlx5e_open_locked(priv->netdev);
 177
 178 unlock:
 179         mutex_unlock(&priv->state_lock);
 180 }
 181
 182 int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
 183 {
 184         struct sk_buff *skb;
 185         dma_addr_t dma_addr;
 186
 187         skb = napi_alloc_skb(rq->cq.napi, rq->wqe_sz);
 188         if (unlikely(!skb))
 189                 return -ENOMEM;
 190
 191         dma_addr = dma_map_single(rq->pdev,
 192                                   /* hw start padding */
 193                                   skb->data,
 194                                   /* hw end padding */
 195                                   rq->wqe_sz,
 196                                   DMA_FROM_DEVICE);
 197
 198         if (unlikely(dma_mapping_error(rq->pdev, dma_addr)))
 199                 goto err_free_skb;
 200
 201         *((dma_addr_t *)skb->cb) = dma_addr;
 202         wqe->data.addr = cpu_to_be64(dma_addr);
 203
 204         rq->skb[ix] = skb;
 205
 206         return 0;
 207
 208 err_free_skb:
 209         dev_kfree_skb(skb);
 210
 211         return -ENOMEM;
 212 }
 213
 214 void mlx5e_dealloc_rx_wqe(struct mlx5e_rq *rq, u16 ix)
 215 {
 216         struct sk_buff *skb = rq->skb[ix];
 217
 218         if (skb) {
 219                 rq->skb[ix] = NULL;
 220                 dma_unmap_single(rq->pdev,
 221                                  *((dma_addr_t *)skb->cb),
 222                                  rq->wqe_sz,
 223                                  DMA_FROM_DEVICE);
 224                 dev_kfree_skb(skb);
 225         }
 226 }
 227
 228 static inline int mlx5e_mpwqe_strides_per_page(struct mlx5e_rq *rq)
 229 {
 230         return rq->mpwqe_num_strides >> MLX5_MPWRQ_WQE_PAGE_ORDER;
 231 }
 232
 233 static inline void mlx5e_add_skb_frag_mpwqe(struct mlx5e_rq *rq,
 234                                             struct sk_buff *skb,
 235                                             struct mlx5e_mpw_info *wi,
 236                                             u32 page_idx, u32 frag_offset,
 237                                             u32 len)
 238 {
 239         unsigned int truesize = ALIGN(len, rq->mpwqe_stride_sz);
 240
 241         dma_sync_single_for_cpu(rq->pdev,
 242                                 wi->umr.dma_info[page_idx].addr + frag_offset,
 243                                 len, DMA_FROM_DEVICE);
 244         wi->skbs_frags[page_idx]++;
 245         skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
 246                         wi->umr.dma_info[page_idx].page, frag_offset,
 247                         len, truesize);
 248 }
 249
 250 static inline void
 251 mlx5e_copy_skb_header_mpwqe(struct device *pdev,
 252                             struct sk_buff *skb,
 253                             struct mlx5e_mpw_info *wi,
 254                             u32 page_idx, u32 offset,
 255                             u32 headlen)
 256 {
 257         u16 headlen_pg = min_t(u32, headlen, PAGE_SIZE - offset);
 258         struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[page_idx];
 259         unsigned int len;
 260
 261          /* Aligning len to sizeof(long) optimizes memcpy performance */
 262         len = ALIGN(headlen_pg, sizeof(long));
 263         dma_sync_single_for_cpu(pdev, dma_info->addr + offset, len,
 264                                 DMA_FROM_DEVICE);
 265         skb_copy_to_linear_data_offset(skb, 0,
 266                                        page_address(dma_info->page) + offset,
 267                                        len);
 268         if (unlikely(offset + headlen > PAGE_SIZE)) {
 269                 dma_info++;
 270                 headlen_pg = len;
 271                 len = ALIGN(headlen - headlen_pg, sizeof(long));
 272                 dma_sync_single_for_cpu(pdev, dma_info->addr, len,
 273                                         DMA_FROM_DEVICE);
 274                 skb_copy_to_linear_data_offset(skb, headlen_pg,
 275                                                page_address(dma_info->page),
 276                                                len);
 277         }
 278 }
 279
 280 static inline void mlx5e_post_umr_wqe(struct mlx5e_rq *rq, u16 ix)
 281 {
 282         struct mlx5e_mpw_info *wi = &rq->wqe_info[ix];
 283         struct mlx5e_sq *sq = &rq->channel->icosq;
 284         struct mlx5_wq_cyc *wq = &sq->wq;
 285         struct mlx5e_umr_wqe *wqe;
 286         u8 num_wqebbs = DIV_ROUND_UP(sizeof(*wqe), MLX5_SEND_WQE_BB);
 287         u16 pi;
 288
 289         /* fill sq edge with nops to avoid wqe wrap around */
 290         while ((pi = (sq->pc & wq->sz_m1)) > sq->edge) {
 291                 sq->ico_wqe_info[pi].opcode = MLX5_OPCODE_NOP;
 292                 sq->ico_wqe_info[pi].num_wqebbs = 1;
 293                 mlx5e_send_nop(sq, true);
 294         }
 295
 296         wqe = mlx5_wq_cyc_get_wqe(wq, pi);
 297         memcpy(wqe, &wi->umr.wqe, sizeof(*wqe));
 298         wqe->ctrl.opmod_idx_opcode =
 299                 cpu_to_be32((sq->pc << MLX5_WQE_CTRL_WQE_INDEX_SHIFT) |
 300                             MLX5_OPCODE_UMR);
 301
 302         sq->ico_wqe_info[pi].opcode = MLX5_OPCODE_UMR;
 303         sq->ico_wqe_info[pi].num_wqebbs = num_wqebbs;
 304         sq->pc += num_wqebbs;
 305         mlx5e_tx_notify_hw(sq, &wqe->ctrl, 0);
 306 }
 307
 308 static inline int mlx5e_page_alloc_mapped(struct mlx5e_rq *rq,
 309                                           struct mlx5e_dma_info *dma_info)
 310 {
 311         struct page *page = dev_alloc_page();
 312
 313         if (unlikely(!page))
 314                 return -ENOMEM;
 315
 316         dma_info->page = page;
 317         dma_info->addr = dma_map_page(rq->pdev, page, 0, PAGE_SIZE,
 318                                       DMA_FROM_DEVICE);
 319         if (unlikely(dma_mapping_error(rq->pdev, dma_info->addr))) {
 320                 put_page(page);
 321                 return -ENOMEM;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static inline void mlx5e_page_release(struct mlx5e_rq *rq,
 328                                       struct mlx5e_dma_info *dma_info)
 329 {
 330         dma_unmap_page(rq->pdev, dma_info->addr, PAGE_SIZE, DMA_FROM_DEVICE);
 331         put_page(dma_info->page);
 332 }
 333
 334 static int mlx5e_alloc_rx_umr_mpwqe(struct mlx5e_rq *rq,
 335                                     struct mlx5e_rx_wqe *wqe,
 336                                     u16 ix)
 337 {
 338         struct mlx5e_mpw_info *wi = &rq->wqe_info[ix];
 339         u64 dma_offset = (u64)mlx5e_get_wqe_mtt_offset(rq, ix) << PAGE_SHIFT;
 340         int pg_strides = mlx5e_mpwqe_strides_per_page(rq);
 341         int err;
 342         int i;
 343
 344         for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++) {
 345                 struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];
 346
 347                 err = mlx5e_page_alloc_mapped(rq, dma_info);
 348                 if (unlikely(err))
 349                         goto err_unmap;
 350                 wi->umr.mtt[i] = cpu_to_be64(dma_info->addr | MLX5_EN_WR);
 351                 page_ref_add(dma_info->page, pg_strides);
 352                 wi->skbs_frags[i] = 0;
 353         }
 354
 355         wi->consumed_strides = 0;
 356         wqe->data.addr = cpu_to_be64(dma_offset);
 357
 358         return 0;
 359
 360 err_unmap:
 361         while (--i >= 0) {
 362                 struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];
 363
 364                 page_ref_sub(dma_info->page, pg_strides);
 365                 mlx5e_page_release(rq, dma_info);
 366         }
 367
 368         return err;
 369 }
 370
 371 void mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi)
 372 {
 373         int pg_strides = mlx5e_mpwqe_strides_per_page(rq);
 374         int i;
 375
 376         for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++) {
 377                 struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];
 378
 379                 page_ref_sub(dma_info->page, pg_strides - wi->skbs_frags[i]);
 380                 mlx5e_page_release(rq, dma_info);
 381         }
 382 }
 383
 384 void mlx5e_post_rx_mpwqe(struct mlx5e_rq *rq)
 385 {
 386         struct mlx5_wq_ll *wq = &rq->wq;
 387         struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
 388
 389         clear_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state);
 390
 391         if (unlikely(test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state))) {
 392                 mlx5e_free_rx_mpwqe(rq, &rq->wqe_info[wq->head]);
 393                 return;
 394         }
 395
 396         mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));
 397
 398         /* ensure wqes are visible to device before updating doorbell record */
 399         dma_wmb();
 400
 401         mlx5_wq_ll_update_db_record(wq);
 402 }
 403
 404 int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
 405 {
 406         int err;
 407
 408         err = mlx5e_alloc_rx_umr_mpwqe(rq, wqe, ix);
 409         if (unlikely(err))
 410                 return err;
 411         set_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state);
 412         mlx5e_post_umr_wqe(rq, ix);
 413         return -EBUSY;
 414 }
 415
 416 void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
 417 {
 418         struct mlx5e_mpw_info *wi = &rq->wqe_info[ix];
 419
 420         mlx5e_free_rx_mpwqe(rq, wi);
 421 }
 422
 423 #define RQ_CANNOT_POST(rq) \
 424         (test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state) || \
 425          test_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state))
 426
 427 bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq)
 428 {
 429         struct mlx5_wq_ll *wq = &rq->wq;
 430
 431         if (unlikely(RQ_CANNOT_POST(rq)))
 432                 return false;
 433
 434         while (!mlx5_wq_ll_is_full(wq)) {
 435                 struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
 436                 int err;
 437
 438                 err = rq->alloc_wqe(rq, wqe, wq->head);
 439                 if (err == -EBUSY)
 440                         return true;
 441                 if (unlikely(err)) {
 442                         rq->stats.buff_alloc_err++;
 443                         break;
 444                 }
 445
 446                 mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));
 447         }
 448
 449         /* ensure wqes are visible to device before updating doorbell record */
 450         dma_wmb();
 451
 452         mlx5_wq_ll_update_db_record(wq);
 453
 454         return !mlx5_wq_ll_is_full(wq);
 455 }
 456
 457 static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe,
 458                                  u32 cqe_bcnt)
 459 {
 460         struct ethhdr   *eth = (struct ethhdr *)(skb->data);
 461         struct iphdr    *ipv4;
 462         struct ipv6hdr  *ipv6;
 463         struct tcphdr   *tcp;
 464         int network_depth = 0;
 465         __be16 proto;
 466         u16 tot_len;
 467
 468         u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe);
 469         int tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA  == l4_hdr_type) ||
 470                        (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type));
 471
 472         skb->mac_len = ETH_HLEN;
 473         proto = __vlan_get_protocol(skb, eth->h_proto, &network_depth);
 474
 475         ipv4 = (struct iphdr *)(skb->data + network_depth);
 476         ipv6 = (struct ipv6hdr *)(skb->data + network_depth);
 477         tot_len = cqe_bcnt - network_depth;
 478
 479         if (proto == htons(ETH_P_IP)) {
 480                 tcp = (struct tcphdr *)(skb->data + network_depth +
 481                                         sizeof(struct iphdr));
 482                 ipv6 = NULL;
 483                 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
 484         } else {
 485                 tcp = (struct tcphdr *)(skb->data + network_depth +
 486                                         sizeof(struct ipv6hdr));
 487                 ipv4 = NULL;
 488                 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
 489         }
 490
 491         if (get_cqe_lro_tcppsh(cqe))
 492                 tcp->psh                = 1;
 493
 494         if (tcp_ack) {
 495                 tcp->ack                = 1;
 496                 tcp->ack_seq            = cqe->lro_ack_seq_num;
 497                 tcp->window             = cqe->lro_tcp_win;
 498         }
 499
 500         if (ipv4) {
 501                 ipv4->ttl               = cqe->lro_min_ttl;
 502                 ipv4->tot_len           = cpu_to_be16(tot_len);
 503                 ipv4->check             = 0;
 504                 ipv4->check             = ip_fast_csum((unsigned char *)ipv4,
 505                                                        ipv4->ihl);
 506         } else {
 507                 ipv6->hop_limit         = cqe->lro_min_ttl;
 508                 ipv6->payload_len       = cpu_to_be16(tot_len -
 509                                                       sizeof(struct ipv6hdr));
 510         }
 511 }
 512
 513 static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe,
 514                                       struct sk_buff *skb)
 515 {
 516         u8 cht = cqe->rss_hash_type;
 517         int ht = (cht & CQE_RSS_HTYPE_L4) ? PKT_HASH_TYPE_L4 :
 518                  (cht & CQE_RSS_HTYPE_IP) ? PKT_HASH_TYPE_L3 :
 519                                             PKT_HASH_TYPE_NONE;
 520         skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht);
 521 }
 522
 523 static inline bool is_first_ethertype_ip(struct sk_buff *skb)
 524 {
 525         __be16 ethertype = ((struct ethhdr *)skb->data)->h_proto;
 526
 527         return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
 528 }
 529
 530 static inline void mlx5e_handle_csum(struct net_device *netdev,
 531                                      struct mlx5_cqe64 *cqe,
 532                                      struct mlx5e_rq *rq,
 533                                      struct sk_buff *skb,
 534                                      bool   lro)
 535 {
 536         if (unlikely(!(netdev->features & NETIF_F_RXCSUM)))
 537                 goto csum_none;
 538
 539         if (lro) {
 540                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 541                 return;
 542         }
 543
 544         if (is_first_ethertype_ip(skb)) {
 545                 skb->ip_summed = CHECKSUM_COMPLETE;
 546                 skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
 547                 rq->stats.csum_complete++;
 548                 return;
 549         }
 550
 551         if (likely((cqe->hds_ip_ext & CQE_L3_OK) &&
 552                    (cqe->hds_ip_ext & CQE_L4_OK))) {
 553                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 554                 if (cqe_is_tunneled(cqe)) {
 555                         skb->csum_level = 1;
 556                         skb->encapsulation = 1;
 557                         rq->stats.csum_unnecessary_inner++;
 558                 }
 559                 return;
 560         }
 561 csum_none:
 562         skb->ip_summed = CHECKSUM_NONE;
 563         rq->stats.csum_none++;
 564 }
 565
 566 static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
 567                                       u32 cqe_bcnt,
 568                                       struct mlx5e_rq *rq,
 569                                       struct sk_buff *skb)
 570 {
 571         struct net_device *netdev = rq->netdev;
 572         struct mlx5e_tstamp *tstamp = rq->tstamp;
 573         int lro_num_seg;
 574
 575         lro_num_seg = be32_to_cpu(cqe->srqn) >> 24;
 576         if (lro_num_seg > 1) {
 577                 mlx5e_lro_update_hdr(skb, cqe, cqe_bcnt);
 578                 skb_shinfo(skb)->gso_size = DIV_ROUND_UP(cqe_bcnt, lro_num_seg);
 579                 rq->stats.lro_packets++;
 580                 rq->stats.lro_bytes += cqe_bcnt;
 581         }
 582
 583         if (unlikely(mlx5e_rx_hw_stamp(tstamp)))
 584                 mlx5e_fill_hwstamp(tstamp, get_cqe_ts(cqe), skb_hwtstamps(skb));
 585
 586         skb_record_rx_queue(skb, rq->ix);
 587
 588         if (likely(netdev->features & NETIF_F_RXHASH))
 589                 mlx5e_skb_set_hash(cqe, skb);
 590
 591         if (cqe_has_vlan(cqe))
 592                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 593                                        be16_to_cpu(cqe->vlan_info));
 594
 595         skb->mark = be32_to_cpu(cqe->sop_drop_qpn) & MLX5E_TC_FLOW_ID_MASK;
 596
 597         mlx5e_handle_csum(netdev, cqe, rq, skb, !!lro_num_seg);
 598         skb->protocol = eth_type_trans(skb, netdev);
 599 }
 600
 601 static inline void mlx5e_complete_rx_cqe(struct mlx5e_rq *rq,
 602                                          struct mlx5_cqe64 *cqe,
 603                                          u32 cqe_bcnt,
 604                                          struct sk_buff *skb)
 605 {
 606         rq->stats.packets++;
 607         rq->stats.bytes += cqe_bcnt;
 608         mlx5e_build_rx_skb(cqe, cqe_bcnt, rq, skb);
 609         napi_gro_receive(rq->cq.napi, skb);
 610 }
 611
 612 void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
 613 {
 614         struct mlx5e_rx_wqe *wqe;
 615         struct sk_buff *skb;
 616         __be16 wqe_counter_be;
 617         u16 wqe_counter;
 618         u32 cqe_bcnt;
 619
 620         wqe_counter_be = cqe->wqe_counter;
 621         wqe_counter    = be16_to_cpu(wqe_counter_be);
 622         wqe            = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
 623         skb            = rq->skb[wqe_counter];
 624         prefetch(skb->data);
 625         rq->skb[wqe_counter] = NULL;
 626
 627         dma_unmap_single(rq->pdev,
 628                          *((dma_addr_t *)skb->cb),
 629                          rq->wqe_sz,
 630                          DMA_FROM_DEVICE);
 631
 632         if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
 633                 rq->stats.wqe_err++;
 634                 dev_kfree_skb(skb);
 635                 goto wq_ll_pop;
 636         }
 637
 638         cqe_bcnt = be32_to_cpu(cqe->byte_cnt);
 639         skb_put(skb, cqe_bcnt);
 640
 641         mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
 642
 643 wq_ll_pop:
 644         mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
 645                        &wqe->next.next_wqe_index);
 646 }
 647
 648 static inline void mlx5e_mpwqe_fill_rx_skb(struct mlx5e_rq *rq,
 649                                            struct mlx5_cqe64 *cqe,
 650                                            struct mlx5e_mpw_info *wi,
 651                                            u32 cqe_bcnt,
 652                                            struct sk_buff *skb)
 653 {
 654         u16 stride_ix      = mpwrq_get_cqe_stride_index(cqe);
 655         u32 wqe_offset     = stride_ix * rq->mpwqe_stride_sz;
 656         u32 head_offset    = wqe_offset & (PAGE_SIZE - 1);
 657         u32 page_idx       = wqe_offset >> PAGE_SHIFT;
 658         u32 head_page_idx  = page_idx;
 659         u16 headlen = min_t(u16, MLX5_MPWRQ_SMALL_PACKET_THRESHOLD, cqe_bcnt);
 660         u32 frag_offset    = head_offset + headlen;
 661         u16 byte_cnt       = cqe_bcnt - headlen;
 662
 663         if (unlikely(frag_offset >= PAGE_SIZE)) {
 664                 page_idx++;
 665                 frag_offset -= PAGE_SIZE;
 666         }
 667
 668         while (byte_cnt) {
 669                 u32 pg_consumed_bytes =
 670                         min_t(u32, PAGE_SIZE - frag_offset, byte_cnt);
 671
 672                 mlx5e_add_skb_frag_mpwqe(rq, skb, wi, page_idx, frag_offset,
 673                                          pg_consumed_bytes);
 674                 byte_cnt -= pg_consumed_bytes;
 675                 frag_offset = 0;
 676                 page_idx++;
 677         }
 678         /* copy header */
 679         mlx5e_copy_skb_header_mpwqe(rq->pdev, skb, wi, head_page_idx,
 680                                     head_offset, headlen);
 681         /* skb linear part was allocated with headlen and aligned to long */
 682         skb->tail += headlen;
 683         skb->len  += headlen;
 684 }
 685
 686 void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
 687 {
 688         u16 cstrides       = mpwrq_get_cqe_consumed_strides(cqe);
 689         u16 wqe_id         = be16_to_cpu(cqe->wqe_id);
 690         struct mlx5e_mpw_info *wi = &rq->wqe_info[wqe_id];
 691         struct mlx5e_rx_wqe  *wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_id);
 692         struct sk_buff *skb;
 693         u16 cqe_bcnt;
 694
 695         wi->consumed_strides += cstrides;
 696
 697         if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
 698                 rq->stats.wqe_err++;
 699                 goto mpwrq_cqe_out;
 700         }
 701
 702         if (unlikely(mpwrq_is_filler_cqe(cqe))) {
 703                 rq->stats.mpwqe_filler++;
 704                 goto mpwrq_cqe_out;
 705         }
 706
 707         skb = napi_alloc_skb(rq->cq.napi,
 708                              ALIGN(MLX5_MPWRQ_SMALL_PACKET_THRESHOLD,
 709                                    sizeof(long)));
 710         if (unlikely(!skb)) {
 711                 rq->stats.buff_alloc_err++;
 712                 goto mpwrq_cqe_out;
 713         }
 714
 715         prefetch(skb->data);
 716         cqe_bcnt = mpwrq_get_cqe_byte_cnt(cqe);
 717
 718         mlx5e_mpwqe_fill_rx_skb(rq, cqe, wi, cqe_bcnt, skb);
 719         mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
 720
 721 mpwrq_cqe_out:
 722         if (likely(wi->consumed_strides < rq->mpwqe_num_strides))
 723                 return;
 724
 725         mlx5e_free_rx_mpwqe(rq, wi);
 726         mlx5_wq_ll_pop(&rq->wq, cqe->wqe_id, &wqe->next.next_wqe_index);
 727 }
 728
 729 int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
 730 {
 731         struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq);
 732         int work_done = 0;
 733
 734         if (unlikely(test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state)))
 735                 return 0;
 736
 737         if (cq->decmprs_left)
 738                 work_done += mlx5e_decompress_cqes_cont(rq, cq, 0, budget);
 739
 740         for (; work_done < budget; work_done++) {
 741                 struct mlx5_cqe64 *cqe = mlx5e_get_cqe(cq);
 742
 743                 if (!cqe)
 744                         break;
 745
 746                 if (mlx5_get_cqe_format(cqe) == MLX5_COMPRESSED) {
 747                         work_done +=
 748                                 mlx5e_decompress_cqes_start(rq, cq,
 749                                                             budget - work_done);
 750                         continue;
 751                 }
 752
 753                 mlx5_cqwq_pop(&cq->wq);
 754
 755                 rq->handle_rx_cqe(rq, cqe);
 756         }
 757
 758         mlx5_cqwq_update_db_record(&cq->wq);
 759
 760         /* ensure cq space is freed before enabling more cqes */
 761         wmb();
 762
 763         return work_done;
 764 }