drivers/net/ethernet/mellanox/mlx4/en_rx.c

   1 /*
   2  * Copyright (c) 2007 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
  34 #include <linux/mlx4/cq.h>
  35 #include <linux/slab.h>
  36 #include <linux/mlx4/qp.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/if_vlan.h>
  40 #include <linux/vmalloc.h>
  41
  42 #include "mlx4_en.h"
  43
  44 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
  45                                struct mlx4_en_rx_desc *rx_desc,
  46                                struct mlx4_en_rx_alloc *frags,
  47                                struct mlx4_en_rx_alloc *ring_alloc)
  48 {
  49         struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
  50         struct mlx4_en_frag_info *frag_info;
  51         struct page *page;
  52         dma_addr_t dma;
  53         int i;
  54
  55         for (i = 0; i < priv->num_frags; i++) {
  56                 frag_info = &priv->frag_info[i];
  57                 if (ring_alloc[i].offset == frag_info->last_offset) {
  58                         page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
  59                                         MLX4_EN_ALLOC_ORDER);
  60                         if (!page)
  61                                 goto out;
  62                         dma = dma_map_page(priv->ddev, page, 0,
  63                                 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
  64                         if (dma_mapping_error(priv->ddev, dma)) {
  65                                 put_page(page);
  66                                 goto out;
  67                         }
  68                         page_alloc[i].page = page;
  69                         page_alloc[i].dma = dma;
  70                         page_alloc[i].offset = frag_info->frag_align;
  71                 } else {
  72                         page_alloc[i].page = ring_alloc[i].page;
  73                         get_page(ring_alloc[i].page);
  74                         page_alloc[i].dma = ring_alloc[i].dma;
  75                         page_alloc[i].offset = ring_alloc[i].offset +
  76                                                 frag_info->frag_stride;
  77                 }
  78         }
  79
  80         for (i = 0; i < priv->num_frags; i++) {
  81                 frags[i] = ring_alloc[i];
  82                 dma = ring_alloc[i].dma + ring_alloc[i].offset;
  83                 ring_alloc[i] = page_alloc[i];
  84                 rx_desc->data[i].addr = cpu_to_be64(dma);
  85         }
  86
  87         return 0;
  88
  89
  90 out:
  91         while (i--) {
  92                 frag_info = &priv->frag_info[i];
  93                 if (ring_alloc[i].offset == frag_info->last_offset)
  94                         dma_unmap_page(priv->ddev, page_alloc[i].dma,
  95                                 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
  96                 put_page(page_alloc[i].page);
  97         }
  98         return -ENOMEM;
  99 }
 100
 101 static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
 102                               struct mlx4_en_rx_alloc *frags,
 103                               int i)
 104 {
 105         struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 106
 107         if (frags[i].offset == frag_info->last_offset) {
 108                 dma_unmap_page(priv->ddev, frags[i].dma, MLX4_EN_ALLOC_SIZE,
 109                                          PCI_DMA_FROMDEVICE);
 110         }
 111         if (frags[i].page)
 112                 put_page(frags[i].page);
 113 }
 114
 115 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
 116                                   struct mlx4_en_rx_ring *ring)
 117 {
 118         struct mlx4_en_rx_alloc *page_alloc;
 119         int i;
 120
 121         for (i = 0; i < priv->num_frags; i++) {
 122                 page_alloc = &ring->page_alloc[i];
 123                 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
 124                                                MLX4_EN_ALLOC_ORDER);
 125                 if (!page_alloc->page)
 126                         goto out;
 127
 128                 page_alloc->dma = dma_map_page(priv->ddev, page_alloc->page, 0,
 129                                         MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
 130                 if (dma_mapping_error(priv->ddev, page_alloc->dma)) {
 131                         put_page(page_alloc->page);
 132                         page_alloc->page = NULL;
 133                         goto out;
 134                 }
 135                 page_alloc->offset = priv->frag_info[i].frag_align;
 136                 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
 137                        i, page_alloc->page);
 138         }
 139         return 0;
 140
 141 out:
 142         while (i--) {
 143                 page_alloc = &ring->page_alloc[i];
 144                 dma_unmap_page(priv->ddev, page_alloc->dma,
 145                                 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
 146                 put_page(page_alloc->page);
 147                 page_alloc->page = NULL;
 148         }
 149         return -ENOMEM;
 150 }
 151
 152 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 153                                       struct mlx4_en_rx_ring *ring)
 154 {
 155         struct mlx4_en_rx_alloc *page_alloc;
 156         int i;
 157
 158         for (i = 0; i < priv->num_frags; i++) {
 159                 page_alloc = &ring->page_alloc[i];
 160                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 161                        i, page_count(page_alloc->page));
 162
 163                 dma_unmap_page(priv->ddev, page_alloc->dma,
 164                                 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
 165                 put_page(page_alloc->page);
 166                 page_alloc->page = NULL;
 167         }
 168 }
 169
 170 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 171                                  struct mlx4_en_rx_ring *ring, int index)
 172 {
 173         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 174         int possible_frags;
 175         int i;
 176
 177         /* Set size and memtype fields */
 178         for (i = 0; i < priv->num_frags; i++) {
 179                 rx_desc->data[i].byte_count =
 180                         cpu_to_be32(priv->frag_info[i].frag_size);
 181                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 182         }
 183
 184         /* If the number of used fragments does not fill up the ring stride,
 185          * remaining (unused) fragments must be padded with null address/size
 186          * and a special memory key */
 187         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 188         for (i = priv->num_frags; i < possible_frags; i++) {
 189                 rx_desc->data[i].byte_count = 0;
 190                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 191                 rx_desc->data[i].addr = 0;
 192         }
 193 }
 194
 195 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 196                                    struct mlx4_en_rx_ring *ring, int index)
 197 {
 198         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 199         struct mlx4_en_rx_alloc *frags = ring->rx_info +
 200                                         (index << priv->log_rx_info);
 201
 202         return mlx4_en_alloc_frags(priv, rx_desc, frags, ring->page_alloc);
 203 }
 204
 205 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 206 {
 207         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 208 }
 209
 210 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 211                                  struct mlx4_en_rx_ring *ring,
 212                                  int index)
 213 {
 214         struct mlx4_en_rx_alloc *frags;
 215         int nr;
 216
 217         frags = ring->rx_info + (index << priv->log_rx_info);
 218         for (nr = 0; nr < priv->num_frags; nr++) {
 219                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 220                 mlx4_en_free_frag(priv, frags, nr);
 221         }
 222 }
 223
 224 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 225 {
 226         struct mlx4_en_rx_ring *ring;
 227         int ring_ind;
 228         int buf_ind;
 229         int new_size;
 230
 231         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 232                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 233                         ring = &priv->rx_ring[ring_ind];
 234
 235                         if (mlx4_en_prepare_rx_desc(priv, ring,
 236                                                     ring->actual_size)) {
 237                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 238                                         en_err(priv, "Failed to allocate "
 239                                                      "enough rx buffers\n");
 240                                         return -ENOMEM;
 241                                 } else {
 242                                         new_size = rounddown_pow_of_two(ring->actual_size);
 243                                         en_warn(priv, "Only %d buffers allocated "
 244                                                       "reducing ring size to %d",
 245                                                 ring->actual_size, new_size);
 246                                         goto reduce_rings;
 247                                 }
 248                         }
 249                         ring->actual_size++;
 250                         ring->prod++;
 251                 }
 252         }
 253         return 0;
 254
 255 reduce_rings:
 256         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 257                 ring = &priv->rx_ring[ring_ind];
 258                 while (ring->actual_size > new_size) {
 259                         ring->actual_size--;
 260                         ring->prod--;
 261                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 262                 }
 263         }
 264
 265         return 0;
 266 }
 267
 268 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 269                                 struct mlx4_en_rx_ring *ring)
 270 {
 271         int index;
 272
 273         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 274                ring->cons, ring->prod);
 275
 276         /* Unmap and free Rx buffers */
 277         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 278         while (ring->cons != ring->prod) {
 279                 index = ring->cons & ring->size_mask;
 280                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 281                 mlx4_en_free_rx_desc(priv, ring, index);
 282                 ++ring->cons;
 283         }
 284 }
 285
 286 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 287                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 288 {
 289         struct mlx4_en_dev *mdev = priv->mdev;
 290         int err = -ENOMEM;
 291         int tmp;
 292
 293         ring->prod = 0;
 294         ring->cons = 0;
 295         ring->size = size;
 296         ring->size_mask = size - 1;
 297         ring->stride = stride;
 298         ring->log_stride = ffs(ring->stride) - 1;
 299         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 300
 301         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 302                                         sizeof(struct mlx4_en_rx_alloc));
 303         ring->rx_info = vmalloc(tmp);
 304         if (!ring->rx_info)
 305                 return -ENOMEM;
 306
 307         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 308                  ring->rx_info, tmp);
 309
 310         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 311                                  ring->buf_size, 2 * PAGE_SIZE);
 312         if (err)
 313                 goto err_ring;
 314
 315         err = mlx4_en_map_buffer(&ring->wqres.buf);
 316         if (err) {
 317                 en_err(priv, "Failed to map RX buffer\n");
 318                 goto err_hwq;
 319         }
 320         ring->buf = ring->wqres.buf.direct.buf;
 321
 322         return 0;
 323
 324 err_hwq:
 325         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 326 err_ring:
 327         vfree(ring->rx_info);
 328         ring->rx_info = NULL;
 329         return err;
 330 }
 331
 332 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 333 {
 334         struct mlx4_en_rx_ring *ring;
 335         int i;
 336         int ring_ind;
 337         int err;
 338         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 339                                         DS_SIZE * priv->num_frags);
 340
 341         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 342                 ring = &priv->rx_ring[ring_ind];
 343
 344                 ring->prod = 0;
 345                 ring->cons = 0;
 346                 ring->actual_size = 0;
 347                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 348
 349                 ring->stride = stride;
 350                 if (ring->stride <= TXBB_SIZE)
 351                         ring->buf += TXBB_SIZE;
 352
 353                 ring->log_stride = ffs(ring->stride) - 1;
 354                 ring->buf_size = ring->size * ring->stride;
 355
 356                 memset(ring->buf, 0, ring->buf_size);
 357                 mlx4_en_update_rx_prod_db(ring);
 358
 359                 /* Initialize all descriptors */
 360                 for (i = 0; i < ring->size; i++)
 361                         mlx4_en_init_rx_desc(priv, ring, i);
 362
 363                 /* Initialize page allocators */
 364                 err = mlx4_en_init_allocator(priv, ring);
 365                 if (err) {
 366                         en_err(priv, "Failed initializing ring allocator\n");
 367                         if (ring->stride <= TXBB_SIZE)
 368                                 ring->buf -= TXBB_SIZE;
 369                         ring_ind--;
 370                         goto err_allocator;
 371                 }
 372         }
 373         err = mlx4_en_fill_rx_buffers(priv);
 374         if (err)
 375                 goto err_buffers;
 376
 377         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 378                 ring = &priv->rx_ring[ring_ind];
 379
 380                 ring->size_mask = ring->actual_size - 1;
 381                 mlx4_en_update_rx_prod_db(ring);
 382         }
 383
 384         return 0;
 385
 386 err_buffers:
 387         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 388                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 389
 390         ring_ind = priv->rx_ring_num - 1;
 391 err_allocator:
 392         while (ring_ind >= 0) {
 393                 if (priv->rx_ring[ring_ind].stride <= TXBB_SIZE)
 394                         priv->rx_ring[ring_ind].buf -= TXBB_SIZE;
 395                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 396                 ring_ind--;
 397         }
 398         return err;
 399 }
 400
 401 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 402                              struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 403 {
 404         struct mlx4_en_dev *mdev = priv->mdev;
 405
 406         mlx4_en_unmap_buffer(&ring->wqres.buf);
 407         mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
 408         vfree(ring->rx_info);
 409         ring->rx_info = NULL;
 410 #ifdef CONFIG_RFS_ACCEL
 411         mlx4_en_cleanup_filters(priv, ring);
 412 #endif
 413 }
 414
 415 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 416                                 struct mlx4_en_rx_ring *ring)
 417 {
 418         mlx4_en_free_rx_buf(priv, ring);
 419         if (ring->stride <= TXBB_SIZE)
 420                 ring->buf -= TXBB_SIZE;
 421         mlx4_en_destroy_allocator(priv, ring);
 422 }
 423
 424
 425 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 426                                     struct mlx4_en_rx_desc *rx_desc,
 427                                     struct mlx4_en_rx_alloc *frags,
 428                                     struct sk_buff *skb,
 429                                     int length)
 430 {
 431         struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
 432         struct mlx4_en_frag_info *frag_info;
 433         int nr;
 434         dma_addr_t dma;
 435
 436         /* Collect used fragments while replacing them in the HW descriptors */
 437         for (nr = 0; nr < priv->num_frags; nr++) {
 438                 frag_info = &priv->frag_info[nr];
 439                 if (length <= frag_info->frag_prefix_size)
 440                         break;
 441                 if (!frags[nr].page)
 442                         goto fail;
 443
 444                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 445                 dma_sync_single_for_cpu(priv->ddev, dma, frag_info->frag_size,
 446                                         DMA_FROM_DEVICE);
 447
 448                 /* Save page reference in skb */
 449                 get_page(frags[nr].page);
 450                 __skb_frag_set_page(&skb_frags_rx[nr], frags[nr].page);
 451                 skb_frag_size_set(&skb_frags_rx[nr], frag_info->frag_size);
 452                 skb_frags_rx[nr].page_offset = frags[nr].offset;
 453                 skb->truesize += frag_info->frag_stride;
 454         }
 455         /* Adjust size of last fragment to match actual length */
 456         if (nr > 0)
 457                 skb_frag_size_set(&skb_frags_rx[nr - 1],
 458                         length - priv->frag_info[nr - 1].frag_prefix_size);
 459         return nr;
 460
 461 fail:
 462         while (nr > 0) {
 463                 nr--;
 464                 __skb_frag_unref(&skb_frags_rx[nr]);
 465         }
 466         return 0;
 467 }
 468
 469
 470 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 471                                       struct mlx4_en_rx_desc *rx_desc,
 472                                       struct mlx4_en_rx_alloc *frags,
 473                                       unsigned int length)
 474 {
 475         struct sk_buff *skb;
 476         void *va;
 477         int used_frags;
 478         dma_addr_t dma;
 479
 480         skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
 481         if (!skb) {
 482                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 483                 return NULL;
 484         }
 485         skb_reserve(skb, NET_IP_ALIGN);
 486         skb->len = length;
 487
 488         /* Get pointer to first fragment so we could copy the headers into the
 489          * (linear part of the) skb */
 490         va = page_address(frags[0].page) + frags[0].offset;
 491
 492         if (length <= SMALL_PACKET_SIZE) {
 493                 /* We are copying all relevant data to the skb - temporarily
 494                  * sync buffers for the copy */
 495                 dma = be64_to_cpu(rx_desc->data[0].addr);
 496                 dma_sync_single_for_cpu(priv->ddev, dma, length,
 497                                         DMA_FROM_DEVICE);
 498                 skb_copy_to_linear_data(skb, va, length);
 499                 skb->tail += length;
 500         } else {
 501                 /* Move relevant fragments to skb */
 502                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, frags,
 503                                                         skb, length);
 504                 if (unlikely(!used_frags)) {
 505                         kfree_skb(skb);
 506                         return NULL;
 507                 }
 508                 skb_shinfo(skb)->nr_frags = used_frags;
 509
 510                 /* Copy headers into the skb linear buffer */
 511                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 512                 skb->tail += HEADER_COPY_SIZE;
 513
 514                 /* Skip headers in first fragment */
 515                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 516
 517                 /* Adjust size of first fragment */
 518                 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], HEADER_COPY_SIZE);
 519                 skb->data_len = length - HEADER_COPY_SIZE;
 520         }
 521         return skb;
 522 }
 523
 524 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
 525 {
 526         int i;
 527         int offset = ETH_HLEN;
 528
 529         for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
 530                 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
 531                         goto out_loopback;
 532         }
 533         /* Loopback found */
 534         priv->loopback_ok = 1;
 535
 536 out_loopback:
 537         dev_kfree_skb_any(skb);
 538 }
 539
 540 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
 541                                      struct mlx4_en_rx_ring *ring)
 542 {
 543         int index = ring->prod & ring->size_mask;
 544
 545         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 546                 if (mlx4_en_prepare_rx_desc(priv, ring, index))
 547                         break;
 548                 ring->prod++;
 549                 index = ring->prod & ring->size_mask;
 550         }
 551 }
 552
 553 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 554 {
 555         struct mlx4_en_priv *priv = netdev_priv(dev);
 556         struct mlx4_cqe *cqe;
 557         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 558         struct mlx4_en_rx_alloc *frags;
 559         struct mlx4_en_rx_desc *rx_desc;
 560         struct sk_buff *skb;
 561         int index;
 562         int nr;
 563         unsigned int length;
 564         int polled = 0;
 565         int ip_summed;
 566         struct ethhdr *ethh;
 567         dma_addr_t dma;
 568         u64 s_mac;
 569
 570         if (!priv->port_up)
 571                 return 0;
 572
 573         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 574          * descriptor offset can be deduced from the CQE index instead of
 575          * reading 'cqe->index' */
 576         index = cq->mcq.cons_index & ring->size_mask;
 577         cqe = &cq->buf[index];
 578
 579         /* Process all completed CQEs */
 580         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 581                     cq->mcq.cons_index & cq->size)) {
 582
 583                 frags = ring->rx_info + (index << priv->log_rx_info);
 584                 rx_desc = ring->buf + (index << ring->log_stride);
 585
 586                 /*
 587                  * make sure we read the CQE after we read the ownership bit
 588                  */
 589                 rmb();
 590
 591                 /* Drop packet on bad receive or bad checksum */
 592                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 593                                                 MLX4_CQE_OPCODE_ERROR)) {
 594                         en_err(priv, "CQE completed in error - vendor "
 595                                   "syndrom:%d syndrom:%d\n",
 596                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 597                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 598                         goto next;
 599                 }
 600                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 601                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 602                         goto next;
 603                 }
 604
 605                 /* Get pointer to first fragment since we haven't skb yet and
 606                  * cast it to ethhdr struct */
 607                 dma = be64_to_cpu(rx_desc->data[0].addr);
 608                 dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
 609                                         DMA_FROM_DEVICE);
 610                 ethh = (struct ethhdr *)(page_address(frags[0].page) +
 611                                          frags[0].offset);
 612                 s_mac = mlx4_en_mac_to_u64(ethh->h_source);
 613
 614                 /* If source MAC is equal to our own MAC and not performing
 615                  * the selftest or flb disabled - drop the packet */
 616                 if (s_mac == priv->mac &&
 617                     !((dev->features & NETIF_F_LOOPBACK) ||
 618                       priv->validate_loopback))
 619                         goto next;
 620
 621                 /*
 622                  * Packet is OK - process it.
 623                  */
 624                 length = be32_to_cpu(cqe->byte_cnt);
 625                 length -= ring->fcs_del;
 626                 ring->bytes += length;
 627                 ring->packets++;
 628
 629                 if (likely(dev->features & NETIF_F_RXCSUM)) {
 630                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 631                             (cqe->checksum == cpu_to_be16(0xffff))) {
 632                                 ring->csum_ok++;
 633                                 /* This packet is eligible for LRO if it is:
 634                                  * - DIX Ethernet (type interpretation)
 635                                  * - TCP/IP (v4)
 636                                  * - without IP options
 637                                  * - not an IP fragment */
 638                                 if (dev->features & NETIF_F_GRO) {
 639                                         struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
 640                                         if (!gro_skb)
 641                                                 goto next;
 642
 643                                         nr = mlx4_en_complete_rx_desc(priv,
 644                                                 rx_desc, frags, gro_skb,
 645                                                 length);
 646                                         if (!nr)
 647                                                 goto next;
 648
 649                                         skb_shinfo(gro_skb)->nr_frags = nr;
 650                                         gro_skb->len = length;
 651                                         gro_skb->data_len = length;
 652                                         gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
 653
 654                                         if (cqe->vlan_my_qpn &
 655                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) {
 656                                                 u16 vid = be16_to_cpu(cqe->sl_vid);
 657
 658                                                 __vlan_hwaccel_put_tag(gro_skb, vid);
 659                                         }
 660
 661                                         if (dev->features & NETIF_F_RXHASH)
 662                                                 gro_skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
 663
 664                                         skb_record_rx_queue(gro_skb, cq->ring);
 665                                         napi_gro_frags(&cq->napi);
 666
 667                                         goto next;
 668                                 }
 669
 670                                 /* LRO not possible, complete processing here */
 671                                 ip_summed = CHECKSUM_UNNECESSARY;
 672                         } else {
 673                                 ip_summed = CHECKSUM_NONE;
 674                                 ring->csum_none++;
 675                         }
 676                 } else {
 677                         ip_summed = CHECKSUM_NONE;
 678                         ring->csum_none++;
 679                 }
 680
 681                 skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
 682                 if (!skb) {
 683                         priv->stats.rx_dropped++;
 684                         goto next;
 685                 }
 686
 687                 if (unlikely(priv->validate_loopback)) {
 688                         validate_loopback(priv, skb);
 689                         goto next;
 690                 }
 691
 692                 skb->ip_summed = ip_summed;
 693                 skb->protocol = eth_type_trans(skb, dev);
 694                 skb_record_rx_queue(skb, cq->ring);
 695
 696                 if (dev->features & NETIF_F_RXHASH)
 697                         skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
 698
 699                 if (be32_to_cpu(cqe->vlan_my_qpn) &
 700                     MLX4_CQE_VLAN_PRESENT_MASK)
 701                         __vlan_hwaccel_put_tag(skb, be16_to_cpu(cqe->sl_vid));
 702
 703                 /* Push it up the stack */
 704                 netif_receive_skb(skb);
 705
 706 next:
 707                 for (nr = 0; nr < priv->num_frags; nr++)
 708                         mlx4_en_free_frag(priv, frags, nr);
 709
 710                 ++cq->mcq.cons_index;
 711                 index = (cq->mcq.cons_index) & ring->size_mask;
 712                 cqe = &cq->buf[index];
 713                 if (++polled == budget) {
 714                         /* We are here because we reached the NAPI budget -
 715                          * flush only pending LRO sessions */
 716                         goto out;
 717                 }
 718         }
 719
 720 out:
 721         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 722         mlx4_cq_set_ci(&cq->mcq);
 723         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 724         ring->cons = cq->mcq.cons_index;
 725         mlx4_en_refill_rx_buffers(priv, ring);
 726         mlx4_en_update_rx_prod_db(ring);
 727         return polled;
 728 }
 729
 730
 731 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 732 {
 733         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 734         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 735
 736         if (priv->port_up)
 737                 napi_schedule(&cq->napi);
 738         else
 739                 mlx4_en_arm_cq(priv, cq);
 740 }
 741
 742 /* Rx CQ polling - called by NAPI */
 743 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 744 {
 745         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 746         struct net_device *dev = cq->dev;
 747         struct mlx4_en_priv *priv = netdev_priv(dev);
 748         int done;
 749
 750         done = mlx4_en_process_rx_cq(dev, cq, budget);
 751
 752         /* If we used up all the quota - we're probably not done yet... */
 753         if (done == budget)
 754                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 755         else {
 756                 /* Done for now */
 757                 napi_complete(napi);
 758                 mlx4_en_arm_cq(priv, cq);
 759         }
 760         return done;
 761 }
 762
 763
 764 /* Calculate the last offset position that accommodates a full fragment
 765  * (assuming fagment size = stride-align) */
 766 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 767 {
 768         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 769         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 770
 771         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 772                             "res:%d offset:%d\n", stride, align, res, offset);
 773         return offset;
 774 }
 775
 776
 777 static int frag_sizes[] = {
 778         FRAG_SZ0,
 779         FRAG_SZ1,
 780         FRAG_SZ2,
 781         FRAG_SZ3
 782 };
 783
 784 void mlx4_en_calc_rx_buf(struct net_device *dev)
 785 {
 786         struct mlx4_en_priv *priv = netdev_priv(dev);
 787         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 788         int buf_size = 0;
 789         int i = 0;
 790
 791         while (buf_size < eff_mtu) {
 792                 priv->frag_info[i].frag_size =
 793                         (eff_mtu > buf_size + frag_sizes[i]) ?
 794                                 frag_sizes[i] : eff_mtu - buf_size;
 795                 priv->frag_info[i].frag_prefix_size = buf_size;
 796                 if (!i) {
 797                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 798                         priv->frag_info[i].frag_stride =
 799                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 800                 } else {
 801                         priv->frag_info[i].frag_align = 0;
 802                         priv->frag_info[i].frag_stride =
 803                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 804                 }
 805                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 806                                                 priv, priv->frag_info[i].frag_stride,
 807                                                 priv->frag_info[i].frag_align);
 808                 buf_size += priv->frag_info[i].frag_size;
 809                 i++;
 810         }
 811
 812         priv->num_frags = i;
 813         priv->rx_skb_size = eff_mtu;
 814         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
 815
 816         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 817                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 818         for (i = 0; i < priv->num_frags; i++) {
 819                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 820                                 "stride:%d last_offset:%d\n", i,
 821                                 priv->frag_info[i].frag_size,
 822                                 priv->frag_info[i].frag_prefix_size,
 823                                 priv->frag_info[i].frag_align,
 824                                 priv->frag_info[i].frag_stride,
 825                                 priv->frag_info[i].last_offset);
 826         }
 827 }
 828
 829 /* RSS related functions */
 830
 831 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
 832                                  struct mlx4_en_rx_ring *ring,
 833                                  enum mlx4_qp_state *state,
 834                                  struct mlx4_qp *qp)
 835 {
 836         struct mlx4_en_dev *mdev = priv->mdev;
 837         struct mlx4_qp_context *context;
 838         int err = 0;
 839
 840         context = kmalloc(sizeof *context , GFP_KERNEL);
 841         if (!context) {
 842                 en_err(priv, "Failed to allocate qp context\n");
 843                 return -ENOMEM;
 844         }
 845
 846         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 847         if (err) {
 848                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 849                 goto out;
 850         }
 851         qp->event = mlx4_en_sqp_event;
 852
 853         memset(context, 0, sizeof *context);
 854         mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
 855                                 qpn, ring->cqn, -1, context);
 856         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
 857
 858         /* Cancel FCS removal if FW allows */
 859         if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
 860                 context->param3 |= cpu_to_be32(1 << 29);
 861                 ring->fcs_del = ETH_FCS_LEN;
 862         } else
 863                 ring->fcs_del = 0;
 864
 865         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
 866         if (err) {
 867                 mlx4_qp_remove(mdev->dev, qp);
 868                 mlx4_qp_free(mdev->dev, qp);
 869         }
 870         mlx4_en_update_rx_prod_db(ring);
 871 out:
 872         kfree(context);
 873         return err;
 874 }
 875
 876 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
 877 {
 878         int err;
 879         u32 qpn;
 880
 881         err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn);
 882         if (err) {
 883                 en_err(priv, "Failed reserving drop qpn\n");
 884                 return err;
 885         }
 886         err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp);
 887         if (err) {
 888                 en_err(priv, "Failed allocating drop qp\n");
 889                 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
 890                 return err;
 891         }
 892
 893         return 0;
 894 }
 895
 896 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
 897 {
 898         u32 qpn;
 899
 900         qpn = priv->drop_qp.qpn;
 901         mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
 902         mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
 903         mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
 904 }
 905
 906 /* Allocate rx qp's and configure them according to rss map */
 907 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 908 {
 909         struct mlx4_en_dev *mdev = priv->mdev;
 910         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 911         struct mlx4_qp_context context;
 912         struct mlx4_rss_context *rss_context;
 913         int rss_rings;
 914         void *ptr;
 915         u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
 916                         MLX4_RSS_TCP_IPV6);
 917         int i, qpn;
 918         int err = 0;
 919         int good_qps = 0;
 920         static const u32 rsskey[10] = { 0xD181C62C, 0xF7F4DB5B, 0x1983A2FC,
 921                                 0x943E1ADB, 0xD9389E6B, 0xD1039C2C, 0xA74499AD,
 922                                 0x593D56D9, 0xF3253C06, 0x2ADC1FFC};
 923
 924         en_dbg(DRV, priv, "Configuring rss steering\n");
 925         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
 926                                     priv->rx_ring_num,
 927                                     &rss_map->base_qpn);
 928         if (err) {
 929                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
 930                 return err;
 931         }
 932
 933         for (i = 0; i < priv->rx_ring_num; i++) {
 934                 qpn = rss_map->base_qpn + i;
 935                 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
 936                                             &rss_map->state[i],
 937                                             &rss_map->qps[i]);
 938                 if (err)
 939                         goto rss_err;
 940
 941                 ++good_qps;
 942         }
 943
 944         /* Configure RSS indirection qp */
 945         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
 946         if (err) {
 947                 en_err(priv, "Failed to allocate RSS indirection QP\n");
 948                 goto rss_err;
 949         }
 950         rss_map->indir_qp.event = mlx4_en_sqp_event;
 951         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
 952                                 priv->rx_ring[0].cqn, -1, &context);
 953
 954         if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
 955                 rss_rings = priv->rx_ring_num;
 956         else
 957                 rss_rings = priv->prof->rss_rings;
 958
 959         ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
 960                                         + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
 961         rss_context = ptr;
 962         rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
 963                                             (rss_map->base_qpn));
 964         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
 965         if (priv->mdev->profile.udp_rss) {
 966                 rss_mask |=  MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
 967                 rss_context->base_qpn_udp = rss_context->default_qpn;
 968         }
 969         rss_context->flags = rss_mask;
 970         rss_context->hash_fn = MLX4_RSS_HASH_TOP;
 971         for (i = 0; i < 10; i++)
 972                 rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
 973
 974         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
 975                                &rss_map->indir_qp, &rss_map->indir_state);
 976         if (err)
 977                 goto indir_err;
 978
 979         return 0;
 980
 981 indir_err:
 982         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 983                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 984         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 985         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 986 rss_err:
 987         for (i = 0; i < good_qps; i++) {
 988                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 989                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 990                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 991                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 992         }
 993         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 994         return err;
 995 }
 996
 997 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
 998 {
 999         struct mlx4_en_dev *mdev = priv->mdev;
1000         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1001         int i;
1002
1003         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1004                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1005         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1006         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1007
1008         for (i = 0; i < priv->rx_ring_num; i++) {
1009                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1010                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1011                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1012                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1013         }
1014         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1015 }