drivers/net/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/mlx4/qp.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/if_ether.h>
  38 #include <linux/if_vlan.h>
  39 #include <linux/vmalloc.h>
  40
  41 #include "mlx4_en.h"
  42
  43
  44 static int mlx4_en_get_frag_header(struct skb_frag_struct *frags, void **mac_hdr,
  45                                    void **ip_hdr, void **tcpudp_hdr,
  46                                    u64 *hdr_flags, void *priv)
  47 {
  48         *mac_hdr = page_address(frags->page) + frags->page_offset;
  49         *ip_hdr = *mac_hdr + ETH_HLEN;
  50         *tcpudp_hdr = (struct tcphdr *)(*ip_hdr + sizeof(struct iphdr));
  51         *hdr_flags = LRO_IPV4 | LRO_TCP;
  52
  53         return 0;
  54 }
  55
  56 static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
  57                               struct mlx4_en_rx_desc *rx_desc,
  58                               struct skb_frag_struct *skb_frags,
  59                               struct mlx4_en_rx_alloc *ring_alloc,
  60                               int i)
  61 {
  62         struct mlx4_en_dev *mdev = priv->mdev;
  63         struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
  64         struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
  65         struct page *page;
  66         dma_addr_t dma;
  67
  68         if (page_alloc->offset == frag_info->last_offset) {
  69                 /* Allocate new page */
  70                 page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
  71                 if (!page)
  72                         return -ENOMEM;
  73
  74                 skb_frags[i].page = page_alloc->page;
  75                 skb_frags[i].page_offset = page_alloc->offset;
  76                 page_alloc->page = page;
  77                 page_alloc->offset = frag_info->frag_align;
  78         } else {
  79                 page = page_alloc->page;
  80                 get_page(page);
  81
  82                 skb_frags[i].page = page;
  83                 skb_frags[i].page_offset = page_alloc->offset;
  84                 page_alloc->offset += frag_info->frag_stride;
  85         }
  86         dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) +
  87                              skb_frags[i].page_offset, frag_info->frag_size,
  88                              PCI_DMA_FROMDEVICE);
  89         rx_desc->data[i].addr = cpu_to_be64(dma);
  90         return 0;
  91 }
  92
  93 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
  94                                   struct mlx4_en_rx_ring *ring)
  95 {
  96         struct mlx4_en_rx_alloc *page_alloc;
  97         int i;
  98
  99         for (i = 0; i < priv->num_frags; i++) {
 100                 page_alloc = &ring->page_alloc[i];
 101                 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
 102                                                MLX4_EN_ALLOC_ORDER);
 103                 if (!page_alloc->page)
 104                         goto out;
 105
 106                 page_alloc->offset = priv->frag_info[i].frag_align;
 107                 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
 108                        i, page_alloc->page);
 109         }
 110         return 0;
 111
 112 out:
 113         while (i--) {
 114                 page_alloc = &ring->page_alloc[i];
 115                 put_page(page_alloc->page);
 116                 page_alloc->page = NULL;
 117         }
 118         return -ENOMEM;
 119 }
 120
 121 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 122                                       struct mlx4_en_rx_ring *ring)
 123 {
 124         struct mlx4_en_rx_alloc *page_alloc;
 125         int i;
 126
 127         for (i = 0; i < priv->num_frags; i++) {
 128                 page_alloc = &ring->page_alloc[i];
 129                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 130                        i, page_count(page_alloc->page));
 131
 132                 put_page(page_alloc->page);
 133                 page_alloc->page = NULL;
 134         }
 135 }
 136
 137
 138 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 139                                  struct mlx4_en_rx_ring *ring, int index)
 140 {
 141         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 142         struct skb_frag_struct *skb_frags = ring->rx_info +
 143                                             (index << priv->log_rx_info);
 144         int possible_frags;
 145         int i;
 146
 147         /* Set size and memtype fields */
 148         for (i = 0; i < priv->num_frags; i++) {
 149                 skb_frags[i].size = priv->frag_info[i].frag_size;
 150                 rx_desc->data[i].byte_count =
 151                         cpu_to_be32(priv->frag_info[i].frag_size);
 152                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 153         }
 154
 155         /* If the number of used fragments does not fill up the ring stride,
 156          * remaining (unused) fragments must be padded with null address/size
 157          * and a special memory key */
 158         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 159         for (i = priv->num_frags; i < possible_frags; i++) {
 160                 rx_desc->data[i].byte_count = 0;
 161                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 162                 rx_desc->data[i].addr = 0;
 163         }
 164 }
 165
 166
 167 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 168                                    struct mlx4_en_rx_ring *ring, int index)
 169 {
 170         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 171         struct skb_frag_struct *skb_frags = ring->rx_info +
 172                                             (index << priv->log_rx_info);
 173         int i;
 174
 175         for (i = 0; i < priv->num_frags; i++)
 176                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
 177                         goto err;
 178
 179         return 0;
 180
 181 err:
 182         while (i--)
 183                 put_page(skb_frags[i].page);
 184         return -ENOMEM;
 185 }
 186
 187 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 188 {
 189         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 190 }
 191
 192 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 193                                  struct mlx4_en_rx_ring *ring,
 194                                  int index)
 195 {
 196         struct mlx4_en_dev *mdev = priv->mdev;
 197         struct skb_frag_struct *skb_frags;
 198         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
 199         dma_addr_t dma;
 200         int nr;
 201
 202         skb_frags = ring->rx_info + (index << priv->log_rx_info);
 203         for (nr = 0; nr < priv->num_frags; nr++) {
 204                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 205                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 206
 207                 en_dbg(DRV, priv, "Unmaping buffer at dma:0x%llx\n", (u64) dma);
 208                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 209                                  PCI_DMA_FROMDEVICE);
 210                 put_page(skb_frags[nr].page);
 211         }
 212 }
 213
 214 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 215 {
 216         struct mlx4_en_rx_ring *ring;
 217         int ring_ind;
 218         int buf_ind;
 219         int new_size;
 220
 221         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 222                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 223                         ring = &priv->rx_ring[ring_ind];
 224
 225                         if (mlx4_en_prepare_rx_desc(priv, ring,
 226                                                     ring->actual_size)) {
 227                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 228                                         en_err(priv, "Failed to allocate "
 229                                                      "enough rx buffers\n");
 230                                         return -ENOMEM;
 231                                 } else {
 232                                         new_size = rounddown_pow_of_two(ring->actual_size);
 233                                         en_warn(priv, "Only %d buffers allocated "
 234                                                       "reducing ring size to %d",
 235                                                 ring->actual_size, new_size);
 236                                         goto reduce_rings;
 237                                 }
 238                         }
 239                         ring->actual_size++;
 240                         ring->prod++;
 241                 }
 242         }
 243         return 0;
 244
 245 reduce_rings:
 246         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 247                 ring = &priv->rx_ring[ring_ind];
 248                 while (ring->actual_size > new_size) {
 249                         ring->actual_size--;
 250                         ring->prod--;
 251                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 252                 }
 253                 ring->size_mask = ring->actual_size - 1;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 260                                 struct mlx4_en_rx_ring *ring)
 261 {
 262         int index;
 263
 264         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 265                ring->cons, ring->prod);
 266
 267         /* Unmap and free Rx buffers */
 268         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 269         while (ring->cons != ring->prod) {
 270                 index = ring->cons & ring->size_mask;
 271                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 272                 mlx4_en_free_rx_desc(priv, ring, index);
 273                 ++ring->cons;
 274         }
 275 }
 276
 277 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 278                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 279 {
 280         struct mlx4_en_dev *mdev = priv->mdev;
 281         int err;
 282         int tmp;
 283
 284
 285         ring->prod = 0;
 286         ring->cons = 0;
 287         ring->size = size;
 288         ring->size_mask = size - 1;
 289         ring->stride = stride;
 290         ring->log_stride = ffs(ring->stride) - 1;
 291         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 292
 293         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 294                                         sizeof(struct skb_frag_struct));
 295         ring->rx_info = vmalloc(tmp);
 296         if (!ring->rx_info) {
 297                 en_err(priv, "Failed allocating rx_info ring\n");
 298                 return -ENOMEM;
 299         }
 300         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 301                  ring->rx_info, tmp);
 302
 303         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 304                                  ring->buf_size, 2 * PAGE_SIZE);
 305         if (err)
 306                 goto err_ring;
 307
 308         err = mlx4_en_map_buffer(&ring->wqres.buf);
 309         if (err) {
 310                 en_err(priv, "Failed to map RX buffer\n");
 311                 goto err_hwq;
 312         }
 313         ring->buf = ring->wqres.buf.direct.buf;
 314
 315         /* Configure lro mngr */
 316         memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
 317         ring->lro.dev = priv->dev;
 318         ring->lro.features = LRO_F_NAPI;
 319         ring->lro.frag_align_pad = NET_IP_ALIGN;
 320         ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
 321         ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 322         ring->lro.max_desc = mdev->profile.num_lro;
 323         ring->lro.max_aggr = MAX_SKB_FRAGS;
 324         ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
 325                                     sizeof(struct net_lro_desc),
 326                                     GFP_KERNEL);
 327         if (!ring->lro.lro_arr) {
 328                 en_err(priv, "Failed to allocate lro array\n");
 329                 goto err_map;
 330         }
 331         ring->lro.get_frag_header = mlx4_en_get_frag_header;
 332
 333         return 0;
 334
 335 err_map:
 336         mlx4_en_unmap_buffer(&ring->wqres.buf);
 337 err_hwq:
 338         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 339 err_ring:
 340         vfree(ring->rx_info);
 341         ring->rx_info = NULL;
 342         return err;
 343 }
 344
 345 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 346 {
 347         struct mlx4_en_rx_ring *ring;
 348         int i;
 349         int ring_ind;
 350         int err;
 351         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 352                                         DS_SIZE * priv->num_frags);
 353
 354         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 355                 ring = &priv->rx_ring[ring_ind];
 356
 357                 ring->prod = 0;
 358                 ring->cons = 0;
 359                 ring->actual_size = 0;
 360                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 361
 362                 ring->stride = stride;
 363                 if (ring->stride <= TXBB_SIZE)
 364                         ring->buf += TXBB_SIZE;
 365
 366                 ring->log_stride = ffs(ring->stride) - 1;
 367                 ring->buf_size = ring->size * ring->stride;
 368
 369                 memset(ring->buf, 0, ring->buf_size);
 370                 mlx4_en_update_rx_prod_db(ring);
 371
 372                 /* Initailize all descriptors */
 373                 for (i = 0; i < ring->size; i++)
 374                         mlx4_en_init_rx_desc(priv, ring, i);
 375
 376                 /* Initialize page allocators */
 377                 err = mlx4_en_init_allocator(priv, ring);
 378                 if (err) {
 379                         en_err(priv, "Failed initializing ring allocator\n");
 380                         ring_ind--;
 381                         goto err_allocator;
 382                 }
 383         }
 384         err = mlx4_en_fill_rx_buffers(priv);
 385         if (err)
 386                 goto err_buffers;
 387
 388         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 389                 ring = &priv->rx_ring[ring_ind];
 390
 391                 mlx4_en_update_rx_prod_db(ring);
 392         }
 393
 394         return 0;
 395
 396 err_buffers:
 397         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 398                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 399
 400         ring_ind = priv->rx_ring_num - 1;
 401 err_allocator:
 402         while (ring_ind >= 0) {
 403                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 404                 ring_ind--;
 405         }
 406         return err;
 407 }
 408
 409 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 410                              struct mlx4_en_rx_ring *ring)
 411 {
 412         struct mlx4_en_dev *mdev = priv->mdev;
 413
 414         kfree(ring->lro.lro_arr);
 415         mlx4_en_unmap_buffer(&ring->wqres.buf);
 416         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size + TXBB_SIZE);
 417         vfree(ring->rx_info);
 418         ring->rx_info = NULL;
 419 }
 420
 421 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 422                                 struct mlx4_en_rx_ring *ring)
 423 {
 424         mlx4_en_free_rx_buf(priv, ring);
 425         if (ring->stride <= TXBB_SIZE)
 426                 ring->buf -= TXBB_SIZE;
 427         mlx4_en_destroy_allocator(priv, ring);
 428 }
 429
 430
 431 /* Unmap a completed descriptor and free unused pages */
 432 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 433                                     struct mlx4_en_rx_desc *rx_desc,
 434                                     struct skb_frag_struct *skb_frags,
 435                                     struct skb_frag_struct *skb_frags_rx,
 436                                     struct mlx4_en_rx_alloc *page_alloc,
 437                                     int length)
 438 {
 439         struct mlx4_en_dev *mdev = priv->mdev;
 440         struct mlx4_en_frag_info *frag_info;
 441         int nr;
 442         dma_addr_t dma;
 443
 444         /* Collect used fragments while replacing them in the HW descirptors */
 445         for (nr = 0; nr < priv->num_frags; nr++) {
 446                 frag_info = &priv->frag_info[nr];
 447                 if (length <= frag_info->frag_prefix_size)
 448                         break;
 449
 450                 /* Save page reference in skb */
 451                 skb_frags_rx[nr].page = skb_frags[nr].page;
 452                 skb_frags_rx[nr].size = skb_frags[nr].size;
 453                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 454                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 455
 456                 /* Allocate a replacement page */
 457                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 458                         goto fail;
 459
 460                 /* Unmap buffer */
 461                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 462                                  PCI_DMA_FROMDEVICE);
 463         }
 464         /* Adjust size of last fragment to match actual length */
 465         skb_frags_rx[nr - 1].size = length -
 466                 priv->frag_info[nr - 1].frag_prefix_size;
 467         return nr;
 468
 469 fail:
 470         /* Drop all accumulated fragments (which have already been replaced in
 471          * the descriptor) of this packet; remaining fragments are reused... */
 472         while (nr > 0) {
 473                 nr--;
 474                 put_page(skb_frags_rx[nr].page);
 475         }
 476         return 0;
 477 }
 478
 479
 480 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 481                                       struct mlx4_en_rx_desc *rx_desc,
 482                                       struct skb_frag_struct *skb_frags,
 483                                       struct mlx4_en_rx_alloc *page_alloc,
 484                                       unsigned int length)
 485 {
 486         struct mlx4_en_dev *mdev = priv->mdev;
 487         struct sk_buff *skb;
 488         void *va;
 489         int used_frags;
 490         dma_addr_t dma;
 491
 492         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 493         if (!skb) {
 494                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 495                 return NULL;
 496         }
 497         skb->dev = priv->dev;
 498         skb_reserve(skb, NET_IP_ALIGN);
 499         skb->len = length;
 500         skb->truesize = length + sizeof(struct sk_buff);
 501
 502         /* Get pointer to first fragment so we could copy the headers into the
 503          * (linear part of the) skb */
 504         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 505
 506         if (length <= SMALL_PACKET_SIZE) {
 507                 /* We are copying all relevant data to the skb - temporarily
 508                  * synch buffers for the copy */
 509                 dma = be64_to_cpu(rx_desc->data[0].addr);
 510                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 511                                               length, DMA_FROM_DEVICE);
 512                 skb_copy_to_linear_data(skb, va, length);
 513                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 514                                                  length, DMA_FROM_DEVICE);
 515                 skb->tail += length;
 516         } else {
 517
 518                 /* Move relevant fragments to skb */
 519                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 520                                                       skb_shinfo(skb)->frags,
 521                                                       page_alloc, length);
 522                 if (unlikely(!used_frags)) {
 523                         kfree_skb(skb);
 524                         return NULL;
 525                 }
 526                 skb_shinfo(skb)->nr_frags = used_frags;
 527
 528                 /* Copy headers into the skb linear buffer */
 529                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 530                 skb->tail += HEADER_COPY_SIZE;
 531
 532                 /* Skip headers in first fragment */
 533                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 534
 535                 /* Adjust size of first fragment */
 536                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 537                 skb->data_len = length - HEADER_COPY_SIZE;
 538         }
 539         return skb;
 540 }
 541
 542
 543 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 544 {
 545         struct mlx4_en_priv *priv = netdev_priv(dev);
 546         struct mlx4_cqe *cqe;
 547         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 548         struct skb_frag_struct *skb_frags;
 549         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 550         struct mlx4_en_rx_desc *rx_desc;
 551         struct sk_buff *skb;
 552         int index;
 553         int nr;
 554         unsigned int length;
 555         int polled = 0;
 556         int ip_summed;
 557
 558         if (!priv->port_up)
 559                 return 0;
 560
 561         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 562          * descriptor offset can be deduced from the CQE index instead of
 563          * reading 'cqe->index' */
 564         index = cq->mcq.cons_index & ring->size_mask;
 565         cqe = &cq->buf[index];
 566
 567         /* Process all completed CQEs */
 568         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 569                     cq->mcq.cons_index & cq->size)) {
 570
 571                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 572                 rx_desc = ring->buf + (index << ring->log_stride);
 573
 574                 /*
 575                  * make sure we read the CQE after we read the ownership bit
 576                  */
 577                 rmb();
 578
 579                 /* Drop packet on bad receive or bad checksum */
 580                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 581                                                 MLX4_CQE_OPCODE_ERROR)) {
 582                         en_err(priv, "CQE completed in error - vendor "
 583                                   "syndrom:%d syndrom:%d\n",
 584                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 585                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 586                         goto next;
 587                 }
 588                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 589                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 590                         goto next;
 591                 }
 592
 593                 /*
 594                  * Packet is OK - process it.
 595                  */
 596                 length = be32_to_cpu(cqe->byte_cnt);
 597                 ring->bytes += length;
 598                 ring->packets++;
 599
 600                 if (likely(priv->rx_csum)) {
 601                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 602                             (cqe->checksum == cpu_to_be16(0xffff))) {
 603                                 priv->port_stats.rx_chksum_good++;
 604                                 /* This packet is eligible for LRO if it is:
 605                                  * - DIX Ethernet (type interpretation)
 606                                  * - TCP/IP (v4)
 607                                  * - without IP options
 608                                  * - not an IP fragment */
 609                                 if (mlx4_en_can_lro(cqe->status) &&
 610                                     dev->features & NETIF_F_LRO) {
 611
 612                                         nr = mlx4_en_complete_rx_desc(
 613                                                 priv, rx_desc,
 614                                                 skb_frags, lro_frags,
 615                                                 ring->page_alloc, length);
 616                                         if (!nr)
 617                                                 goto next;
 618
 619                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 620                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 621                                                 lro_vlan_hwaccel_receive_frags(
 622                                                        &ring->lro, lro_frags,
 623                                                        length, length,
 624                                                        priv->vlgrp,
 625                                                        be16_to_cpu(cqe->sl_vid),
 626                                                        NULL, 0);
 627                                         } else
 628                                                 lro_receive_frags(&ring->lro,
 629                                                                   lro_frags,
 630                                                                   length,
 631                                                                   length,
 632                                                                   NULL, 0);
 633
 634                                         goto next;
 635                                 }
 636
 637                                 /* LRO not possible, complete processing here */
 638                                 ip_summed = CHECKSUM_UNNECESSARY;
 639                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 640                         } else {
 641                                 ip_summed = CHECKSUM_NONE;
 642                                 priv->port_stats.rx_chksum_none++;
 643                         }
 644                 } else {
 645                         ip_summed = CHECKSUM_NONE;
 646                         priv->port_stats.rx_chksum_none++;
 647                 }
 648
 649                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 650                                      ring->page_alloc, length);
 651                 if (!skb) {
 652                         priv->stats.rx_dropped++;
 653                         goto next;
 654                 }
 655
 656                 skb->ip_summed = ip_summed;
 657                 skb->protocol = eth_type_trans(skb, dev);
 658                 skb_record_rx_queue(skb, cq->ring);
 659
 660                 /* Push it up the stack */
 661                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 662                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 663                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 664                                                 be16_to_cpu(cqe->sl_vid));
 665                 } else
 666                         netif_receive_skb(skb);
 667
 668 next:
 669                 ++cq->mcq.cons_index;
 670                 index = (cq->mcq.cons_index) & ring->size_mask;
 671                 cqe = &cq->buf[index];
 672                 if (++polled == budget) {
 673                         /* We are here because we reached the NAPI budget -
 674                          * flush only pending LRO sessions */
 675                         lro_flush_all(&ring->lro);
 676                         goto out;
 677                 }
 678         }
 679
 680         /* If CQ is empty flush all LRO sessions unconditionally */
 681         lro_flush_all(&ring->lro);
 682
 683 out:
 684         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 685         mlx4_cq_set_ci(&cq->mcq);
 686         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 687         ring->cons = cq->mcq.cons_index;
 688         ring->prod += polled; /* Polled descriptors were realocated in place */
 689         mlx4_en_update_rx_prod_db(ring);
 690         return polled;
 691 }
 692
 693
 694 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 695 {
 696         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 697         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 698
 699         if (priv->port_up)
 700                 napi_schedule(&cq->napi);
 701         else
 702                 mlx4_en_arm_cq(priv, cq);
 703 }
 704
 705 /* Rx CQ polling - called by NAPI */
 706 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 707 {
 708         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 709         struct net_device *dev = cq->dev;
 710         struct mlx4_en_priv *priv = netdev_priv(dev);
 711         int done;
 712
 713         done = mlx4_en_process_rx_cq(dev, cq, budget);
 714
 715         /* If we used up all the quota - we're probably not done yet... */
 716         if (done == budget)
 717                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 718         else {
 719                 /* Done for now */
 720                 napi_complete(napi);
 721                 mlx4_en_arm_cq(priv, cq);
 722         }
 723         return done;
 724 }
 725
 726
 727 /* Calculate the last offset position that accomodates a full fragment
 728  * (assuming fagment size = stride-align) */
 729 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 730 {
 731         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 732         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 733
 734         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 735                             "res:%d offset:%d\n", stride, align, res, offset);
 736         return offset;
 737 }
 738
 739
 740 static int frag_sizes[] = {
 741         FRAG_SZ0,
 742         FRAG_SZ1,
 743         FRAG_SZ2,
 744         FRAG_SZ3
 745 };
 746
 747 void mlx4_en_calc_rx_buf(struct net_device *dev)
 748 {
 749         struct mlx4_en_priv *priv = netdev_priv(dev);
 750         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 751         int buf_size = 0;
 752         int i = 0;
 753
 754         while (buf_size < eff_mtu) {
 755                 priv->frag_info[i].frag_size =
 756                         (eff_mtu > buf_size + frag_sizes[i]) ?
 757                                 frag_sizes[i] : eff_mtu - buf_size;
 758                 priv->frag_info[i].frag_prefix_size = buf_size;
 759                 if (!i) {
 760                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 761                         priv->frag_info[i].frag_stride =
 762                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 763                 } else {
 764                         priv->frag_info[i].frag_align = 0;
 765                         priv->frag_info[i].frag_stride =
 766                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 767                 }
 768                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 769                                                 priv, priv->frag_info[i].frag_stride,
 770                                                 priv->frag_info[i].frag_align);
 771                 buf_size += priv->frag_info[i].frag_size;
 772                 i++;
 773         }
 774
 775         priv->num_frags = i;
 776         priv->rx_skb_size = eff_mtu;
 777         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 778
 779         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 780                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 781         for (i = 0; i < priv->num_frags; i++) {
 782                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 783                                 "stride:%d last_offset:%d\n", i,
 784                                 priv->frag_info[i].frag_size,
 785                                 priv->frag_info[i].frag_prefix_size,
 786                                 priv->frag_info[i].frag_align,
 787                                 priv->frag_info[i].frag_stride,
 788                                 priv->frag_info[i].last_offset);
 789         }
 790 }
 791
 792 /* RSS related functions */
 793
 794 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
 795                                  struct mlx4_en_rx_ring *ring,
 796                                  enum mlx4_qp_state *state,
 797                                  struct mlx4_qp *qp)
 798 {
 799         struct mlx4_en_dev *mdev = priv->mdev;
 800         struct mlx4_qp_context *context;
 801         int err = 0;
 802
 803         context = kmalloc(sizeof *context , GFP_KERNEL);
 804         if (!context) {
 805                 en_err(priv, "Failed to allocate qp context\n");
 806                 return -ENOMEM;
 807         }
 808
 809         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 810         if (err) {
 811                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 812                 goto out;
 813         }
 814         qp->event = mlx4_en_sqp_event;
 815
 816         memset(context, 0, sizeof *context);
 817         mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 0, 0,
 818                                 qpn, ring->cqn, context);
 819         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
 820
 821         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
 822         if (err) {
 823                 mlx4_qp_remove(mdev->dev, qp);
 824                 mlx4_qp_free(mdev->dev, qp);
 825         }
 826         mlx4_en_update_rx_prod_db(ring);
 827 out:
 828         kfree(context);
 829         return err;
 830 }
 831
 832 /* Allocate rx qp's and configure them according to rss map */
 833 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 834 {
 835         struct mlx4_en_dev *mdev = priv->mdev;
 836         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 837         struct mlx4_qp_context context;
 838         struct mlx4_en_rss_context *rss_context;
 839         void *ptr;
 840         int rss_xor = mdev->profile.rss_xor;
 841         u8 rss_mask = mdev->profile.rss_mask;
 842         int i, qpn;
 843         int err = 0;
 844         int good_qps = 0;
 845
 846         en_dbg(DRV, priv, "Configuring rss steering\n");
 847         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
 848                                     priv->rx_ring_num,
 849                                     &rss_map->base_qpn);
 850         if (err) {
 851                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
 852                 return err;
 853         }
 854
 855         for (i = 0; i < priv->rx_ring_num; i++) {
 856                 qpn = rss_map->base_qpn + i;
 857                 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
 858                                             &rss_map->state[i],
 859                                             &rss_map->qps[i]);
 860                 if (err)
 861                         goto rss_err;
 862
 863                 ++good_qps;
 864         }
 865
 866         /* Configure RSS indirection qp */
 867         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
 868         if (err) {
 869                 en_err(priv, "Failed to reserve range for RSS "
 870                              "indirection qp\n");
 871                 goto rss_err;
 872         }
 873         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
 874         if (err) {
 875                 en_err(priv, "Failed to allocate RSS indirection QP\n");
 876                 goto reserve_err;
 877         }
 878         rss_map->indir_qp.event = mlx4_en_sqp_event;
 879         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
 880                                 priv->rx_ring[0].cqn, &context);
 881
 882         ptr = ((void *) &context) + 0x3c;
 883         rss_context = (struct mlx4_en_rss_context *) ptr;
 884         rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 |
 885                                             (rss_map->base_qpn));
 886         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
 887         rss_context->hash_fn = rss_xor & 0x3;
 888         rss_context->flags = rss_mask << 2;
 889
 890         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
 891                                &rss_map->indir_qp, &rss_map->indir_state);
 892         if (err)
 893                 goto indir_err;
 894
 895         return 0;
 896
 897 indir_err:
 898         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 899                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 900         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 901         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 902 reserve_err:
 903         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 904 rss_err:
 905         for (i = 0; i < good_qps; i++) {
 906                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 907                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 908                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 909                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 910         }
 911         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 912         return err;
 913 }
 914
 915 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
 916 {
 917         struct mlx4_en_dev *mdev = priv->mdev;
 918         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 919         int i;
 920
 921         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 922                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 923         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 924         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 925         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 926
 927         for (i = 0; i < priv->rx_ring_num; i++) {
 928                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 929                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 930                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 931                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 932         }
 933         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 934 }
 935
 936
 937
 938
 939