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/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
  45 static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
  46                               struct mlx4_en_rx_desc *rx_desc,
  47                               struct skb_frag_struct *skb_frags,
  48                               struct mlx4_en_rx_alloc *ring_alloc,
  49                               int i)
  50 {
  51         struct mlx4_en_dev *mdev = priv->mdev;
  52         struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
  53         struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
  54         struct page *page;
  55         dma_addr_t dma;
  56
  57         if (page_alloc->offset == frag_info->last_offset) {
  58                 /* Allocate new page */
  59                 page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
  60                 if (!page)
  61                         return -ENOMEM;
  62
  63                 skb_frags[i].page = page_alloc->page;
  64                 skb_frags[i].page_offset = page_alloc->offset;
  65                 page_alloc->page = page;
  66                 page_alloc->offset = frag_info->frag_align;
  67         } else {
  68                 page = page_alloc->page;
  69                 get_page(page);
  70
  71                 skb_frags[i].page = page;
  72                 skb_frags[i].page_offset = page_alloc->offset;
  73                 page_alloc->offset += frag_info->frag_stride;
  74         }
  75         dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) +
  76                              skb_frags[i].page_offset, frag_info->frag_size,
  77                              PCI_DMA_FROMDEVICE);
  78         rx_desc->data[i].addr = cpu_to_be64(dma);
  79         return 0;
  80 }
  81
  82 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
  83                                   struct mlx4_en_rx_ring *ring)
  84 {
  85         struct mlx4_en_rx_alloc *page_alloc;
  86         int i;
  87
  88         for (i = 0; i < priv->num_frags; i++) {
  89                 page_alloc = &ring->page_alloc[i];
  90                 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
  91                                                MLX4_EN_ALLOC_ORDER);
  92                 if (!page_alloc->page)
  93                         goto out;
  94
  95                 page_alloc->offset = priv->frag_info[i].frag_align;
  96                 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
  97                        i, page_alloc->page);
  98         }
  99         return 0;
 100
 101 out:
 102         while (i--) {
 103                 page_alloc = &ring->page_alloc[i];
 104                 put_page(page_alloc->page);
 105                 page_alloc->page = NULL;
 106         }
 107         return -ENOMEM;
 108 }
 109
 110 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 111                                       struct mlx4_en_rx_ring *ring)
 112 {
 113         struct mlx4_en_rx_alloc *page_alloc;
 114         int i;
 115
 116         for (i = 0; i < priv->num_frags; i++) {
 117                 page_alloc = &ring->page_alloc[i];
 118                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 119                        i, page_count(page_alloc->page));
 120
 121                 put_page(page_alloc->page);
 122                 page_alloc->page = NULL;
 123         }
 124 }
 125
 126
 127 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 128                                  struct mlx4_en_rx_ring *ring, int index)
 129 {
 130         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 131         struct skb_frag_struct *skb_frags = ring->rx_info +
 132                                             (index << priv->log_rx_info);
 133         int possible_frags;
 134         int i;
 135
 136         /* Set size and memtype fields */
 137         for (i = 0; i < priv->num_frags; i++) {
 138                 skb_frags[i].size = priv->frag_info[i].frag_size;
 139                 rx_desc->data[i].byte_count =
 140                         cpu_to_be32(priv->frag_info[i].frag_size);
 141                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 142         }
 143
 144         /* If the number of used fragments does not fill up the ring stride,
 145          * remaining (unused) fragments must be padded with null address/size
 146          * and a special memory key */
 147         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 148         for (i = priv->num_frags; i < possible_frags; i++) {
 149                 rx_desc->data[i].byte_count = 0;
 150                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 151                 rx_desc->data[i].addr = 0;
 152         }
 153 }
 154
 155
 156 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 157                                    struct mlx4_en_rx_ring *ring, int index)
 158 {
 159         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 160         struct skb_frag_struct *skb_frags = ring->rx_info +
 161                                             (index << priv->log_rx_info);
 162         int i;
 163
 164         for (i = 0; i < priv->num_frags; i++)
 165                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
 166                         goto err;
 167
 168         return 0;
 169
 170 err:
 171         while (i--)
 172                 put_page(skb_frags[i].page);
 173         return -ENOMEM;
 174 }
 175
 176 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 177 {
 178         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 179 }
 180
 181 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 182                                  struct mlx4_en_rx_ring *ring,
 183                                  int index)
 184 {
 185         struct mlx4_en_dev *mdev = priv->mdev;
 186         struct skb_frag_struct *skb_frags;
 187         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
 188         dma_addr_t dma;
 189         int nr;
 190
 191         skb_frags = ring->rx_info + (index << priv->log_rx_info);
 192         for (nr = 0; nr < priv->num_frags; nr++) {
 193                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 194                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 195
 196                 en_dbg(DRV, priv, "Unmapping buffer at dma:0x%llx\n", (u64) dma);
 197                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 198                                  PCI_DMA_FROMDEVICE);
 199                 put_page(skb_frags[nr].page);
 200         }
 201 }
 202
 203 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 204 {
 205         struct mlx4_en_rx_ring *ring;
 206         int ring_ind;
 207         int buf_ind;
 208         int new_size;
 209
 210         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 211                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 212                         ring = &priv->rx_ring[ring_ind];
 213
 214                         if (mlx4_en_prepare_rx_desc(priv, ring,
 215                                                     ring->actual_size)) {
 216                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 217                                         en_err(priv, "Failed to allocate "
 218                                                      "enough rx buffers\n");
 219                                         return -ENOMEM;
 220                                 } else {
 221                                         new_size = rounddown_pow_of_two(ring->actual_size);
 222                                         en_warn(priv, "Only %d buffers allocated "
 223                                                       "reducing ring size to %d",
 224                                                 ring->actual_size, new_size);
 225                                         goto reduce_rings;
 226                                 }
 227                         }
 228                         ring->actual_size++;
 229                         ring->prod++;
 230                 }
 231         }
 232         return 0;
 233
 234 reduce_rings:
 235         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 236                 ring = &priv->rx_ring[ring_ind];
 237                 while (ring->actual_size > new_size) {
 238                         ring->actual_size--;
 239                         ring->prod--;
 240                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 241                 }
 242         }
 243
 244         return 0;
 245 }
 246
 247 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 248                                 struct mlx4_en_rx_ring *ring)
 249 {
 250         int index;
 251
 252         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 253                ring->cons, ring->prod);
 254
 255         /* Unmap and free Rx buffers */
 256         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 257         while (ring->cons != ring->prod) {
 258                 index = ring->cons & ring->size_mask;
 259                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 260                 mlx4_en_free_rx_desc(priv, ring, index);
 261                 ++ring->cons;
 262         }
 263 }
 264
 265 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 266                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 267 {
 268         struct mlx4_en_dev *mdev = priv->mdev;
 269         int err;
 270         int tmp;
 271
 272
 273         ring->prod = 0;
 274         ring->cons = 0;
 275         ring->size = size;
 276         ring->size_mask = size - 1;
 277         ring->stride = stride;
 278         ring->log_stride = ffs(ring->stride) - 1;
 279         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 280
 281         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 282                                         sizeof(struct skb_frag_struct));
 283         ring->rx_info = vmalloc(tmp);
 284         if (!ring->rx_info) {
 285                 en_err(priv, "Failed allocating rx_info ring\n");
 286                 return -ENOMEM;
 287         }
 288         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 289                  ring->rx_info, tmp);
 290
 291         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 292                                  ring->buf_size, 2 * PAGE_SIZE);
 293         if (err)
 294                 goto err_ring;
 295
 296         err = mlx4_en_map_buffer(&ring->wqres.buf);
 297         if (err) {
 298                 en_err(priv, "Failed to map RX buffer\n");
 299                 goto err_hwq;
 300         }
 301         ring->buf = ring->wqres.buf.direct.buf;
 302
 303         return 0;
 304
 305 err_map:
 306         mlx4_en_unmap_buffer(&ring->wqres.buf);
 307 err_hwq:
 308         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 309 err_ring:
 310         vfree(ring->rx_info);
 311         ring->rx_info = NULL;
 312         return err;
 313 }
 314
 315 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 316 {
 317         struct mlx4_en_rx_ring *ring;
 318         int i;
 319         int ring_ind;
 320         int err;
 321         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 322                                         DS_SIZE * priv->num_frags);
 323
 324         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 325                 ring = &priv->rx_ring[ring_ind];
 326
 327                 ring->prod = 0;
 328                 ring->cons = 0;
 329                 ring->actual_size = 0;
 330                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 331
 332                 ring->stride = stride;
 333                 if (ring->stride <= TXBB_SIZE)
 334                         ring->buf += TXBB_SIZE;
 335
 336                 ring->log_stride = ffs(ring->stride) - 1;
 337                 ring->buf_size = ring->size * ring->stride;
 338
 339                 memset(ring->buf, 0, ring->buf_size);
 340                 mlx4_en_update_rx_prod_db(ring);
 341
 342                 /* Initailize all descriptors */
 343                 for (i = 0; i < ring->size; i++)
 344                         mlx4_en_init_rx_desc(priv, ring, i);
 345
 346                 /* Initialize page allocators */
 347                 err = mlx4_en_init_allocator(priv, ring);
 348                 if (err) {
 349                         en_err(priv, "Failed initializing ring allocator\n");
 350                         ring_ind--;
 351                         goto err_allocator;
 352                 }
 353         }
 354         err = mlx4_en_fill_rx_buffers(priv);
 355         if (err)
 356                 goto err_buffers;
 357
 358         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 359                 ring = &priv->rx_ring[ring_ind];
 360
 361                 ring->size_mask = ring->actual_size - 1;
 362                 mlx4_en_update_rx_prod_db(ring);
 363         }
 364
 365         return 0;
 366
 367 err_buffers:
 368         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 369                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 370
 371         ring_ind = priv->rx_ring_num - 1;
 372 err_allocator:
 373         while (ring_ind >= 0) {
 374                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 375                 ring_ind--;
 376         }
 377         return err;
 378 }
 379
 380 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 381                              struct mlx4_en_rx_ring *ring)
 382 {
 383         struct mlx4_en_dev *mdev = priv->mdev;
 384
 385         mlx4_en_unmap_buffer(&ring->wqres.buf);
 386         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size + TXBB_SIZE);
 387         vfree(ring->rx_info);
 388         ring->rx_info = NULL;
 389 }
 390
 391 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 392                                 struct mlx4_en_rx_ring *ring)
 393 {
 394         mlx4_en_free_rx_buf(priv, ring);
 395         if (ring->stride <= TXBB_SIZE)
 396                 ring->buf -= TXBB_SIZE;
 397         mlx4_en_destroy_allocator(priv, ring);
 398 }
 399
 400
 401 /* Unmap a completed descriptor and free unused pages */
 402 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 403                                     struct mlx4_en_rx_desc *rx_desc,
 404                                     struct skb_frag_struct *skb_frags,
 405                                     struct skb_frag_struct *skb_frags_rx,
 406                                     struct mlx4_en_rx_alloc *page_alloc,
 407                                     int length)
 408 {
 409         struct mlx4_en_dev *mdev = priv->mdev;
 410         struct mlx4_en_frag_info *frag_info;
 411         int nr;
 412         dma_addr_t dma;
 413
 414         /* Collect used fragments while replacing them in the HW descirptors */
 415         for (nr = 0; nr < priv->num_frags; nr++) {
 416                 frag_info = &priv->frag_info[nr];
 417                 if (length <= frag_info->frag_prefix_size)
 418                         break;
 419
 420                 /* Save page reference in skb */
 421                 skb_frags_rx[nr].page = skb_frags[nr].page;
 422                 skb_frags_rx[nr].size = skb_frags[nr].size;
 423                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 424                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 425
 426                 /* Allocate a replacement page */
 427                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 428                         goto fail;
 429
 430                 /* Unmap buffer */
 431                 pci_unmap_single(mdev->pdev, dma, skb_frags_rx[nr].size,
 432                                  PCI_DMA_FROMDEVICE);
 433         }
 434         /* Adjust size of last fragment to match actual length */
 435         if (nr > 0)
 436                 skb_frags_rx[nr - 1].size = length -
 437                         priv->frag_info[nr - 1].frag_prefix_size;
 438         return nr;
 439
 440 fail:
 441         /* Drop all accumulated fragments (which have already been replaced in
 442          * the descriptor) of this packet; remaining fragments are reused... */
 443         while (nr > 0) {
 444                 nr--;
 445                 put_page(skb_frags_rx[nr].page);
 446         }
 447         return 0;
 448 }
 449
 450
 451 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 452                                       struct mlx4_en_rx_desc *rx_desc,
 453                                       struct skb_frag_struct *skb_frags,
 454                                       struct mlx4_en_rx_alloc *page_alloc,
 455                                       unsigned int length)
 456 {
 457         struct mlx4_en_dev *mdev = priv->mdev;
 458         struct sk_buff *skb;
 459         void *va;
 460         int used_frags;
 461         dma_addr_t dma;
 462
 463         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 464         if (!skb) {
 465                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 466                 return NULL;
 467         }
 468         skb->dev = priv->dev;
 469         skb_reserve(skb, NET_IP_ALIGN);
 470         skb->len = length;
 471         skb->truesize = length + sizeof(struct sk_buff);
 472
 473         /* Get pointer to first fragment so we could copy the headers into the
 474          * (linear part of the) skb */
 475         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 476
 477         if (length <= SMALL_PACKET_SIZE) {
 478                 /* We are copying all relevant data to the skb - temporarily
 479                  * synch buffers for the copy */
 480                 dma = be64_to_cpu(rx_desc->data[0].addr);
 481                 dma_sync_single_for_cpu(&mdev->pdev->dev, dma, length,
 482                                         DMA_FROM_DEVICE);
 483                 skb_copy_to_linear_data(skb, va, length);
 484                 dma_sync_single_for_device(&mdev->pdev->dev, dma, length,
 485                                            DMA_FROM_DEVICE);
 486                 skb->tail += length;
 487         } else {
 488
 489                 /* Move relevant fragments to skb */
 490                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 491                                                       skb_shinfo(skb)->frags,
 492                                                       page_alloc, length);
 493                 if (unlikely(!used_frags)) {
 494                         kfree_skb(skb);
 495                         return NULL;
 496                 }
 497                 skb_shinfo(skb)->nr_frags = used_frags;
 498
 499                 /* Copy headers into the skb linear buffer */
 500                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 501                 skb->tail += HEADER_COPY_SIZE;
 502
 503                 /* Skip headers in first fragment */
 504                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 505
 506                 /* Adjust size of first fragment */
 507                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 508                 skb->data_len = length - HEADER_COPY_SIZE;
 509         }
 510         return skb;
 511 }
 512
 513 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
 514 {
 515         int i;
 516         int offset = ETH_HLEN;
 517
 518         for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
 519                 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
 520                         goto out_loopback;
 521         }
 522         /* Loopback found */
 523         priv->loopback_ok = 1;
 524
 525 out_loopback:
 526         dev_kfree_skb_any(skb);
 527 }
 528
 529 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 530 {
 531         struct mlx4_en_priv *priv = netdev_priv(dev);
 532         struct mlx4_cqe *cqe;
 533         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 534         struct skb_frag_struct *skb_frags;
 535         struct mlx4_en_rx_desc *rx_desc;
 536         struct sk_buff *skb;
 537         int index;
 538         int nr;
 539         unsigned int length;
 540         int polled = 0;
 541         int ip_summed;
 542
 543         if (!priv->port_up)
 544                 return 0;
 545
 546         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 547          * descriptor offset can be deduced from the CQE index instead of
 548          * reading 'cqe->index' */
 549         index = cq->mcq.cons_index & ring->size_mask;
 550         cqe = &cq->buf[index];
 551
 552         /* Process all completed CQEs */
 553         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 554                     cq->mcq.cons_index & cq->size)) {
 555
 556                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 557                 rx_desc = ring->buf + (index << ring->log_stride);
 558
 559                 /*
 560                  * make sure we read the CQE after we read the ownership bit
 561                  */
 562                 rmb();
 563
 564                 /* Drop packet on bad receive or bad checksum */
 565                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 566                                                 MLX4_CQE_OPCODE_ERROR)) {
 567                         en_err(priv, "CQE completed in error - vendor "
 568                                   "syndrom:%d syndrom:%d\n",
 569                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 570                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 571                         goto next;
 572                 }
 573                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 574                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 575                         goto next;
 576                 }
 577
 578                 /*
 579                  * Packet is OK - process it.
 580                  */
 581                 length = be32_to_cpu(cqe->byte_cnt);
 582                 ring->bytes += length;
 583                 ring->packets++;
 584
 585                 if (likely(priv->rx_csum)) {
 586                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 587                             (cqe->checksum == cpu_to_be16(0xffff))) {
 588                                 priv->port_stats.rx_chksum_good++;
 589                                 /* This packet is eligible for LRO if it is:
 590                                  * - DIX Ethernet (type interpretation)
 591                                  * - TCP/IP (v4)
 592                                  * - without IP options
 593                                  * - not an IP fragment */
 594                                 if (dev->features & NETIF_F_GRO) {
 595                                         struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
 596
 597                                         nr = mlx4_en_complete_rx_desc(
 598                                                 priv, rx_desc,
 599                                                 skb_frags, skb_shinfo(gro_skb)->frags,
 600                                                 ring->page_alloc, length);
 601                                         if (!nr)
 602                                                 goto next;
 603
 604                                         skb_shinfo(gro_skb)->nr_frags = nr;
 605                                         gro_skb->len = length;
 606                                         gro_skb->data_len = length;
 607                                         gro_skb->truesize += length;
 608                                         gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
 609
 610                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 611                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)))
 612                                                 vlan_gro_frags(&cq->napi, priv->vlgrp, be16_to_cpu(cqe->sl_vid));
 613                                         else
 614                                                 napi_gro_frags(&cq->napi);
 615
 616                                         goto next;
 617                                 }
 618
 619                                 /* LRO not possible, complete processing here */
 620                                 ip_summed = CHECKSUM_UNNECESSARY;
 621                         } else {
 622                                 ip_summed = CHECKSUM_NONE;
 623                                 priv->port_stats.rx_chksum_none++;
 624                         }
 625                 } else {
 626                         ip_summed = CHECKSUM_NONE;
 627                         priv->port_stats.rx_chksum_none++;
 628                 }
 629
 630                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 631                                      ring->page_alloc, length);
 632                 if (!skb) {
 633                         priv->stats.rx_dropped++;
 634                         goto next;
 635                 }
 636
 637                 if (unlikely(priv->validate_loopback)) {
 638                         validate_loopback(priv, skb);
 639                         goto next;
 640                 }
 641
 642                 skb->ip_summed = ip_summed;
 643                 skb->protocol = eth_type_trans(skb, dev);
 644                 skb_record_rx_queue(skb, cq->ring);
 645
 646                 /* Push it up the stack */
 647                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 648                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 649                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 650                                                 be16_to_cpu(cqe->sl_vid));
 651                 } else
 652                         netif_receive_skb(skb);
 653
 654 next:
 655                 ++cq->mcq.cons_index;
 656                 index = (cq->mcq.cons_index) & ring->size_mask;
 657                 cqe = &cq->buf[index];
 658                 if (++polled == budget) {
 659                         /* We are here because we reached the NAPI budget -
 660                          * flush only pending LRO sessions */
 661                         goto out;
 662                 }
 663         }
 664
 665 out:
 666         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 667         mlx4_cq_set_ci(&cq->mcq);
 668         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 669         ring->cons = cq->mcq.cons_index;
 670         ring->prod += polled; /* Polled descriptors were realocated in place */
 671         mlx4_en_update_rx_prod_db(ring);
 672         return polled;
 673 }
 674
 675
 676 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 677 {
 678         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 679         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 680
 681         if (priv->port_up)
 682                 napi_schedule(&cq->napi);
 683         else
 684                 mlx4_en_arm_cq(priv, cq);
 685 }
 686
 687 /* Rx CQ polling - called by NAPI */
 688 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 689 {
 690         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 691         struct net_device *dev = cq->dev;
 692         struct mlx4_en_priv *priv = netdev_priv(dev);
 693         int done;
 694
 695         done = mlx4_en_process_rx_cq(dev, cq, budget);
 696
 697         /* If we used up all the quota - we're probably not done yet... */
 698         if (done == budget)
 699                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 700         else {
 701                 /* Done for now */
 702                 napi_complete(napi);
 703                 mlx4_en_arm_cq(priv, cq);
 704         }
 705         return done;
 706 }
 707
 708
 709 /* Calculate the last offset position that accomodates a full fragment
 710  * (assuming fagment size = stride-align) */
 711 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 712 {
 713         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 714         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 715
 716         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 717                             "res:%d offset:%d\n", stride, align, res, offset);
 718         return offset;
 719 }
 720
 721
 722 static int frag_sizes[] = {
 723         FRAG_SZ0,
 724         FRAG_SZ1,
 725         FRAG_SZ2,
 726         FRAG_SZ3
 727 };
 728
 729 void mlx4_en_calc_rx_buf(struct net_device *dev)
 730 {
 731         struct mlx4_en_priv *priv = netdev_priv(dev);
 732         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 733         int buf_size = 0;
 734         int i = 0;
 735
 736         while (buf_size < eff_mtu) {
 737                 priv->frag_info[i].frag_size =
 738                         (eff_mtu > buf_size + frag_sizes[i]) ?
 739                                 frag_sizes[i] : eff_mtu - buf_size;
 740                 priv->frag_info[i].frag_prefix_size = buf_size;
 741                 if (!i) {
 742                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 743                         priv->frag_info[i].frag_stride =
 744                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 745                 } else {
 746                         priv->frag_info[i].frag_align = 0;
 747                         priv->frag_info[i].frag_stride =
 748                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 749                 }
 750                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 751                                                 priv, priv->frag_info[i].frag_stride,
 752                                                 priv->frag_info[i].frag_align);
 753                 buf_size += priv->frag_info[i].frag_size;
 754                 i++;
 755         }
 756
 757         priv->num_frags = i;
 758         priv->rx_skb_size = eff_mtu;
 759         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 760
 761         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 762                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 763         for (i = 0; i < priv->num_frags; i++) {
 764                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 765                                 "stride:%d last_offset:%d\n", i,
 766                                 priv->frag_info[i].frag_size,
 767                                 priv->frag_info[i].frag_prefix_size,
 768                                 priv->frag_info[i].frag_align,
 769                                 priv->frag_info[i].frag_stride,
 770                                 priv->frag_info[i].last_offset);
 771         }
 772 }
 773
 774 /* RSS related functions */
 775
 776 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
 777                                  struct mlx4_en_rx_ring *ring,
 778                                  enum mlx4_qp_state *state,
 779                                  struct mlx4_qp *qp)
 780 {
 781         struct mlx4_en_dev *mdev = priv->mdev;
 782         struct mlx4_qp_context *context;
 783         int err = 0;
 784
 785         context = kmalloc(sizeof *context , GFP_KERNEL);
 786         if (!context) {
 787                 en_err(priv, "Failed to allocate qp context\n");
 788                 return -ENOMEM;
 789         }
 790
 791         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 792         if (err) {
 793                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 794                 goto out;
 795         }
 796         qp->event = mlx4_en_sqp_event;
 797
 798         memset(context, 0, sizeof *context);
 799         mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
 800                                 qpn, ring->cqn, context);
 801         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
 802
 803         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
 804         if (err) {
 805                 mlx4_qp_remove(mdev->dev, qp);
 806                 mlx4_qp_free(mdev->dev, qp);
 807         }
 808         mlx4_en_update_rx_prod_db(ring);
 809 out:
 810         kfree(context);
 811         return err;
 812 }
 813
 814 /* Allocate rx qp's and configure them according to rss map */
 815 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 816 {
 817         struct mlx4_en_dev *mdev = priv->mdev;
 818         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 819         struct mlx4_qp_context context;
 820         struct mlx4_en_rss_context *rss_context;
 821         void *ptr;
 822         u8 rss_mask = 0x3f;
 823         int i, qpn;
 824         int err = 0;
 825         int good_qps = 0;
 826
 827         en_dbg(DRV, priv, "Configuring rss steering\n");
 828         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
 829                                     priv->rx_ring_num,
 830                                     &rss_map->base_qpn);
 831         if (err) {
 832                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
 833                 return err;
 834         }
 835
 836         for (i = 0; i < priv->rx_ring_num; i++) {
 837                 qpn = rss_map->base_qpn + i;
 838                 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
 839                                             &rss_map->state[i],
 840                                             &rss_map->qps[i]);
 841                 if (err)
 842                         goto rss_err;
 843
 844                 ++good_qps;
 845         }
 846
 847         /* Configure RSS indirection qp */
 848         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
 849         if (err) {
 850                 en_err(priv, "Failed to reserve range for RSS "
 851                              "indirection qp\n");
 852                 goto rss_err;
 853         }
 854         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
 855         if (err) {
 856                 en_err(priv, "Failed to allocate RSS indirection QP\n");
 857                 goto reserve_err;
 858         }
 859         rss_map->indir_qp.event = mlx4_en_sqp_event;
 860         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
 861                                 priv->rx_ring[0].cqn, &context);
 862
 863         ptr = ((void *) &context) + 0x3c;
 864         rss_context = (struct mlx4_en_rss_context *) ptr;
 865         rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 |
 866                                             (rss_map->base_qpn));
 867         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
 868         rss_context->flags = rss_mask;
 869
 870         if (priv->mdev->profile.udp_rss)
 871                 rss_context->base_qpn_udp = rss_context->default_qpn;
 872         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
 873                                &rss_map->indir_qp, &rss_map->indir_state);
 874         if (err)
 875                 goto indir_err;
 876
 877         return 0;
 878
 879 indir_err:
 880         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 881                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 882         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 883         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 884 reserve_err:
 885         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 886 rss_err:
 887         for (i = 0; i < good_qps; i++) {
 888                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 889                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 890                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 891                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 892         }
 893         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 894         return err;
 895 }
 896
 897 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
 898 {
 899         struct mlx4_en_dev *mdev = priv->mdev;
 900         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 901         int i;
 902
 903         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 904                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 905         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 906         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 907         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 908
 909         for (i = 0; i < priv->rx_ring_num; i++) {
 910                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 911                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 912                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 913                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 914         }
 915         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 916 }
 917
 918
 919
 920
 921