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 <net/busy_poll.h>
  35 #include <linux/mlx4/cq.h>
  36 #include <linux/slab.h>
  37 #include <linux/mlx4/qp.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/rculist.h>
  40 #include <linux/if_ether.h>
  41 #include <linux/if_vlan.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include "mlx4_en.h"
  45
  46 static int mlx4_alloc_pages(struct mlx4_en_priv *priv,
  47                             struct mlx4_en_rx_alloc *page_alloc,
  48                             const struct mlx4_en_frag_info *frag_info,
  49                             gfp_t _gfp)
  50 {
  51         int order;
  52         struct page *page;
  53         dma_addr_t dma;
  54
  55         for (order = MLX4_EN_ALLOC_PREFER_ORDER; ;) {
  56                 gfp_t gfp = _gfp;
  57
  58                 if (order)
  59                         gfp |= __GFP_COMP | __GFP_NOWARN;
  60                 page = alloc_pages(gfp, order);
  61                 if (likely(page))
  62                         break;
  63                 if (--order < 0 ||
  64                     ((PAGE_SIZE << order) < frag_info->frag_size))
  65                         return -ENOMEM;
  66         }
  67         dma = dma_map_page(priv->ddev, page, 0, PAGE_SIZE << order,
  68                            PCI_DMA_FROMDEVICE);
  69         if (dma_mapping_error(priv->ddev, dma)) {
  70                 put_page(page);
  71                 return -ENOMEM;
  72         }
  73         page_alloc->page_size = PAGE_SIZE << order;
  74         page_alloc->page = page;
  75         page_alloc->dma = dma;
  76         page_alloc->page_offset = frag_info->frag_align;
  77         /* Not doing get_page() for each frag is a big win
  78          * on asymetric workloads.
  79          */
  80         atomic_set(&page->_count,
  81                    page_alloc->page_size / frag_info->frag_stride);
  82         return 0;
  83 }
  84
  85 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
  86                                struct mlx4_en_rx_desc *rx_desc,
  87                                struct mlx4_en_rx_alloc *frags,
  88                                struct mlx4_en_rx_alloc *ring_alloc,
  89                                gfp_t gfp)
  90 {
  91         struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
  92         const struct mlx4_en_frag_info *frag_info;
  93         struct page *page;
  94         dma_addr_t dma;
  95         int i;
  96
  97         for (i = 0; i < priv->num_frags; i++) {
  98                 frag_info = &priv->frag_info[i];
  99                 page_alloc[i] = ring_alloc[i];
 100                 page_alloc[i].page_offset += frag_info->frag_stride;
 101
 102                 if (page_alloc[i].page_offset + frag_info->frag_stride <=
 103                     ring_alloc[i].page_size)
 104                         continue;
 105
 106                 if (mlx4_alloc_pages(priv, &page_alloc[i], frag_info, gfp))
 107                         goto out;
 108         }
 109
 110         for (i = 0; i < priv->num_frags; i++) {
 111                 frags[i] = ring_alloc[i];
 112                 dma = ring_alloc[i].dma + ring_alloc[i].page_offset;
 113                 ring_alloc[i] = page_alloc[i];
 114                 rx_desc->data[i].addr = cpu_to_be64(dma);
 115         }
 116
 117         return 0;
 118
 119 out:
 120         while (i--) {
 121                 frag_info = &priv->frag_info[i];
 122                 if (page_alloc[i].page != ring_alloc[i].page) {
 123                         dma_unmap_page(priv->ddev, page_alloc[i].dma,
 124                                 page_alloc[i].page_size, PCI_DMA_FROMDEVICE);
 125                         page = page_alloc[i].page;
 126                         atomic_set(&page->_count, 1);
 127                         put_page(page);
 128                 }
 129         }
 130         return -ENOMEM;
 131 }
 132
 133 static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
 134                               struct mlx4_en_rx_alloc *frags,
 135                               int i)
 136 {
 137         const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 138         u32 next_frag_end = frags[i].page_offset + 2 * frag_info->frag_stride;
 139
 140
 141         if (next_frag_end > frags[i].page_size)
 142                 dma_unmap_page(priv->ddev, frags[i].dma, frags[i].page_size,
 143                                PCI_DMA_FROMDEVICE);
 144
 145         if (frags[i].page)
 146                 put_page(frags[i].page);
 147 }
 148
 149 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
 150                                   struct mlx4_en_rx_ring *ring)
 151 {
 152         int i;
 153         struct mlx4_en_rx_alloc *page_alloc;
 154
 155         for (i = 0; i < priv->num_frags; i++) {
 156                 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 157
 158                 if (mlx4_alloc_pages(priv, &ring->page_alloc[i],
 159                                      frag_info, GFP_KERNEL))
 160                         goto out;
 161         }
 162         return 0;
 163
 164 out:
 165         while (i--) {
 166                 struct page *page;
 167
 168                 page_alloc = &ring->page_alloc[i];
 169                 dma_unmap_page(priv->ddev, page_alloc->dma,
 170                                page_alloc->page_size, PCI_DMA_FROMDEVICE);
 171                 page = page_alloc->page;
 172                 atomic_set(&page->_count, 1);
 173                 put_page(page);
 174                 page_alloc->page = NULL;
 175         }
 176         return -ENOMEM;
 177 }
 178
 179 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 180                                       struct mlx4_en_rx_ring *ring)
 181 {
 182         struct mlx4_en_rx_alloc *page_alloc;
 183         int i;
 184
 185         for (i = 0; i < priv->num_frags; i++) {
 186                 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 187
 188                 page_alloc = &ring->page_alloc[i];
 189                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 190                        i, page_count(page_alloc->page));
 191
 192                 dma_unmap_page(priv->ddev, page_alloc->dma,
 193                                 page_alloc->page_size, PCI_DMA_FROMDEVICE);
 194                 while (page_alloc->page_offset + frag_info->frag_stride <
 195                        page_alloc->page_size) {
 196                         put_page(page_alloc->page);
 197                         page_alloc->page_offset += frag_info->frag_stride;
 198                 }
 199                 page_alloc->page = NULL;
 200         }
 201 }
 202
 203 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 204                                  struct mlx4_en_rx_ring *ring, int index)
 205 {
 206         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 207         int possible_frags;
 208         int i;
 209
 210         /* Set size and memtype fields */
 211         for (i = 0; i < priv->num_frags; i++) {
 212                 rx_desc->data[i].byte_count =
 213                         cpu_to_be32(priv->frag_info[i].frag_size);
 214                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 215         }
 216
 217         /* If the number of used fragments does not fill up the ring stride,
 218          * remaining (unused) fragments must be padded with null address/size
 219          * and a special memory key */
 220         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 221         for (i = priv->num_frags; i < possible_frags; i++) {
 222                 rx_desc->data[i].byte_count = 0;
 223                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 224                 rx_desc->data[i].addr = 0;
 225         }
 226 }
 227
 228 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 229                                    struct mlx4_en_rx_ring *ring, int index,
 230                                    gfp_t gfp)
 231 {
 232         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 233         struct mlx4_en_rx_alloc *frags = ring->rx_info +
 234                                         (index << priv->log_rx_info);
 235
 236         return mlx4_en_alloc_frags(priv, rx_desc, frags, ring->page_alloc, gfp);
 237 }
 238
 239 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 240 {
 241         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 242 }
 243
 244 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 245                                  struct mlx4_en_rx_ring *ring,
 246                                  int index)
 247 {
 248         struct mlx4_en_rx_alloc *frags;
 249         int nr;
 250
 251         frags = ring->rx_info + (index << priv->log_rx_info);
 252         for (nr = 0; nr < priv->num_frags; nr++) {
 253                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 254                 mlx4_en_free_frag(priv, frags, nr);
 255         }
 256 }
 257
 258 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 259 {
 260         struct mlx4_en_rx_ring *ring;
 261         int ring_ind;
 262         int buf_ind;
 263         int new_size;
 264
 265         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 266                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 267                         ring = priv->rx_ring[ring_ind];
 268
 269                         if (mlx4_en_prepare_rx_desc(priv, ring,
 270                                                     ring->actual_size,
 271                                                     GFP_KERNEL)) {
 272                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 273                                         en_err(priv, "Failed to allocate "
 274                                                      "enough rx buffers\n");
 275                                         return -ENOMEM;
 276                                 } else {
 277                                         new_size = rounddown_pow_of_two(ring->actual_size);
 278                                         en_warn(priv, "Only %d buffers allocated "
 279                                                       "reducing ring size to %d",
 280                                                 ring->actual_size, new_size);
 281                                         goto reduce_rings;
 282                                 }
 283                         }
 284                         ring->actual_size++;
 285                         ring->prod++;
 286                 }
 287         }
 288         return 0;
 289
 290 reduce_rings:
 291         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 292                 ring = priv->rx_ring[ring_ind];
 293                 while (ring->actual_size > new_size) {
 294                         ring->actual_size--;
 295                         ring->prod--;
 296                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 297                 }
 298         }
 299
 300         return 0;
 301 }
 302
 303 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 304                                 struct mlx4_en_rx_ring *ring)
 305 {
 306         int index;
 307
 308         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 309                ring->cons, ring->prod);
 310
 311         /* Unmap and free Rx buffers */
 312         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 313         while (ring->cons != ring->prod) {
 314                 index = ring->cons & ring->size_mask;
 315                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 316                 mlx4_en_free_rx_desc(priv, ring, index);
 317                 ++ring->cons;
 318         }
 319 }
 320
 321 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 322                            struct mlx4_en_rx_ring **pring,
 323                            u32 size, u16 stride, int node)
 324 {
 325         struct mlx4_en_dev *mdev = priv->mdev;
 326         struct mlx4_en_rx_ring *ring;
 327         int err = -ENOMEM;
 328         int tmp;
 329
 330         ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
 331         if (!ring) {
 332                 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 333                 if (!ring) {
 334                         en_err(priv, "Failed to allocate RX ring structure\n");
 335                         return -ENOMEM;
 336                 }
 337         }
 338
 339         ring->prod = 0;
 340         ring->cons = 0;
 341         ring->size = size;
 342         ring->size_mask = size - 1;
 343         ring->stride = stride;
 344         ring->log_stride = ffs(ring->stride) - 1;
 345         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 346
 347         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 348                                         sizeof(struct mlx4_en_rx_alloc));
 349         ring->rx_info = vmalloc_node(tmp, node);
 350         if (!ring->rx_info) {
 351                 ring->rx_info = vmalloc(tmp);
 352                 if (!ring->rx_info) {
 353                         err = -ENOMEM;
 354                         goto err_ring;
 355                 }
 356         }
 357
 358         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 359                  ring->rx_info, tmp);
 360
 361         /* Allocate HW buffers on provided NUMA node */
 362         set_dev_node(&mdev->dev->pdev->dev, node);
 363         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 364                                  ring->buf_size, 2 * PAGE_SIZE);
 365         set_dev_node(&mdev->dev->pdev->dev, mdev->dev->numa_node);
 366         if (err)
 367                 goto err_info;
 368
 369         err = mlx4_en_map_buffer(&ring->wqres.buf);
 370         if (err) {
 371                 en_err(priv, "Failed to map RX buffer\n");
 372                 goto err_hwq;
 373         }
 374         ring->buf = ring->wqres.buf.direct.buf;
 375
 376         ring->hwtstamp_rx_filter = priv->hwtstamp_config.rx_filter;
 377
 378         *pring = ring;
 379         return 0;
 380
 381 err_hwq:
 382         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 383 err_info:
 384         vfree(ring->rx_info);
 385         ring->rx_info = NULL;
 386 err_ring:
 387         kfree(ring);
 388         *pring = NULL;
 389
 390         return err;
 391 }
 392
 393 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 394 {
 395         struct mlx4_en_rx_ring *ring;
 396         int i;
 397         int ring_ind;
 398         int err;
 399         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 400                                         DS_SIZE * priv->num_frags);
 401
 402         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 403                 ring = priv->rx_ring[ring_ind];
 404
 405                 ring->prod = 0;
 406                 ring->cons = 0;
 407                 ring->actual_size = 0;
 408                 ring->cqn = priv->rx_cq[ring_ind]->mcq.cqn;
 409
 410                 ring->stride = stride;
 411                 if (ring->stride <= TXBB_SIZE)
 412                         ring->buf += TXBB_SIZE;
 413
 414                 ring->log_stride = ffs(ring->stride) - 1;
 415                 ring->buf_size = ring->size * ring->stride;
 416
 417                 memset(ring->buf, 0, ring->buf_size);
 418                 mlx4_en_update_rx_prod_db(ring);
 419
 420                 /* Initialize all descriptors */
 421                 for (i = 0; i < ring->size; i++)
 422                         mlx4_en_init_rx_desc(priv, ring, i);
 423
 424                 /* Initialize page allocators */
 425                 err = mlx4_en_init_allocator(priv, ring);
 426                 if (err) {
 427                         en_err(priv, "Failed initializing ring allocator\n");
 428                         if (ring->stride <= TXBB_SIZE)
 429                                 ring->buf -= TXBB_SIZE;
 430                         ring_ind--;
 431                         goto err_allocator;
 432                 }
 433         }
 434         err = mlx4_en_fill_rx_buffers(priv);
 435         if (err)
 436                 goto err_buffers;
 437
 438         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 439                 ring = priv->rx_ring[ring_ind];
 440
 441                 ring->size_mask = ring->actual_size - 1;
 442                 mlx4_en_update_rx_prod_db(ring);
 443         }
 444
 445         return 0;
 446
 447 err_buffers:
 448         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 449                 mlx4_en_free_rx_buf(priv, priv->rx_ring[ring_ind]);
 450
 451         ring_ind = priv->rx_ring_num - 1;
 452 err_allocator:
 453         while (ring_ind >= 0) {
 454                 if (priv->rx_ring[ring_ind]->stride <= TXBB_SIZE)
 455                         priv->rx_ring[ring_ind]->buf -= TXBB_SIZE;
 456                 mlx4_en_destroy_allocator(priv, priv->rx_ring[ring_ind]);
 457                 ring_ind--;
 458         }
 459         return err;
 460 }
 461
 462 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 463                              struct mlx4_en_rx_ring **pring,
 464                              u32 size, u16 stride)
 465 {
 466         struct mlx4_en_dev *mdev = priv->mdev;
 467         struct mlx4_en_rx_ring *ring = *pring;
 468
 469         mlx4_en_unmap_buffer(&ring->wqres.buf);
 470         mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
 471         vfree(ring->rx_info);
 472         ring->rx_info = NULL;
 473         kfree(ring);
 474         *pring = NULL;
 475 #ifdef CONFIG_RFS_ACCEL
 476         mlx4_en_cleanup_filters(priv);
 477 #endif
 478 }
 479
 480 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 481                                 struct mlx4_en_rx_ring *ring)
 482 {
 483         mlx4_en_free_rx_buf(priv, ring);
 484         if (ring->stride <= TXBB_SIZE)
 485                 ring->buf -= TXBB_SIZE;
 486         mlx4_en_destroy_allocator(priv, ring);
 487 }
 488
 489
 490 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 491                                     struct mlx4_en_rx_desc *rx_desc,
 492                                     struct mlx4_en_rx_alloc *frags,
 493                                     struct sk_buff *skb,
 494                                     int length)
 495 {
 496         struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
 497         struct mlx4_en_frag_info *frag_info;
 498         int nr;
 499         dma_addr_t dma;
 500
 501         /* Collect used fragments while replacing them in the HW descriptors */
 502         for (nr = 0; nr < priv->num_frags; nr++) {
 503                 frag_info = &priv->frag_info[nr];
 504                 if (length <= frag_info->frag_prefix_size)
 505                         break;
 506                 if (!frags[nr].page)
 507                         goto fail;
 508
 509                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 510                 dma_sync_single_for_cpu(priv->ddev, dma, frag_info->frag_size,
 511                                         DMA_FROM_DEVICE);
 512
 513                 /* Save page reference in skb */
 514                 __skb_frag_set_page(&skb_frags_rx[nr], frags[nr].page);
 515                 skb_frag_size_set(&skb_frags_rx[nr], frag_info->frag_size);
 516                 skb_frags_rx[nr].page_offset = frags[nr].page_offset;
 517                 skb->truesize += frag_info->frag_stride;
 518                 frags[nr].page = NULL;
 519         }
 520         /* Adjust size of last fragment to match actual length */
 521         if (nr > 0)
 522                 skb_frag_size_set(&skb_frags_rx[nr - 1],
 523                         length - priv->frag_info[nr - 1].frag_prefix_size);
 524         return nr;
 525
 526 fail:
 527         while (nr > 0) {
 528                 nr--;
 529                 __skb_frag_unref(&skb_frags_rx[nr]);
 530         }
 531         return 0;
 532 }
 533
 534
 535 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 536                                       struct mlx4_en_rx_desc *rx_desc,
 537                                       struct mlx4_en_rx_alloc *frags,
 538                                       unsigned int length)
 539 {
 540         struct sk_buff *skb;
 541         void *va;
 542         int used_frags;
 543         dma_addr_t dma;
 544
 545         skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
 546         if (!skb) {
 547                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 548                 return NULL;
 549         }
 550         skb_reserve(skb, NET_IP_ALIGN);
 551         skb->len = length;
 552
 553         /* Get pointer to first fragment so we could copy the headers into the
 554          * (linear part of the) skb */
 555         va = page_address(frags[0].page) + frags[0].page_offset;
 556
 557         if (length <= SMALL_PACKET_SIZE) {
 558                 /* We are copying all relevant data to the skb - temporarily
 559                  * sync buffers for the copy */
 560                 dma = be64_to_cpu(rx_desc->data[0].addr);
 561                 dma_sync_single_for_cpu(priv->ddev, dma, length,
 562                                         DMA_FROM_DEVICE);
 563                 skb_copy_to_linear_data(skb, va, length);
 564                 skb->tail += length;
 565         } else {
 566                 /* Move relevant fragments to skb */
 567                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, frags,
 568                                                         skb, length);
 569                 if (unlikely(!used_frags)) {
 570                         kfree_skb(skb);
 571                         return NULL;
 572                 }
 573                 skb_shinfo(skb)->nr_frags = used_frags;
 574
 575                 /* Copy headers into the skb linear buffer */
 576                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 577                 skb->tail += HEADER_COPY_SIZE;
 578
 579                 /* Skip headers in first fragment */
 580                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 581
 582                 /* Adjust size of first fragment */
 583                 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], HEADER_COPY_SIZE);
 584                 skb->data_len = length - HEADER_COPY_SIZE;
 585         }
 586         return skb;
 587 }
 588
 589 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
 590 {
 591         int i;
 592         int offset = ETH_HLEN;
 593
 594         for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
 595                 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
 596                         goto out_loopback;
 597         }
 598         /* Loopback found */
 599         priv->loopback_ok = 1;
 600
 601 out_loopback:
 602         dev_kfree_skb_any(skb);
 603 }
 604
 605 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
 606                                      struct mlx4_en_rx_ring *ring)
 607 {
 608         int index = ring->prod & ring->size_mask;
 609
 610         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 611                 if (mlx4_en_prepare_rx_desc(priv, ring, index, GFP_ATOMIC))
 612                         break;
 613                 ring->prod++;
 614                 index = ring->prod & ring->size_mask;
 615         }
 616 }
 617
 618 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 619 {
 620         struct mlx4_en_priv *priv = netdev_priv(dev);
 621         struct mlx4_en_dev *mdev = priv->mdev;
 622         struct mlx4_cqe *cqe;
 623         struct mlx4_en_rx_ring *ring = priv->rx_ring[cq->ring];
 624         struct mlx4_en_rx_alloc *frags;
 625         struct mlx4_en_rx_desc *rx_desc;
 626         struct sk_buff *skb;
 627         int index;
 628         int nr;
 629         unsigned int length;
 630         int polled = 0;
 631         int ip_summed;
 632         int factor = priv->cqe_factor;
 633         u64 timestamp;
 634
 635         if (!priv->port_up)
 636                 return 0;
 637
 638         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 639          * descriptor offset can be deduced from the CQE index instead of
 640          * reading 'cqe->index' */
 641         index = cq->mcq.cons_index & ring->size_mask;
 642         cqe = &cq->buf[(index << factor) + factor];
 643
 644         /* Process all completed CQEs */
 645         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 646                     cq->mcq.cons_index & cq->size)) {
 647
 648                 frags = ring->rx_info + (index << priv->log_rx_info);
 649                 rx_desc = ring->buf + (index << ring->log_stride);
 650
 651                 /*
 652                  * make sure we read the CQE after we read the ownership bit
 653                  */
 654                 rmb();
 655
 656                 /* Drop packet on bad receive or bad checksum */
 657                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 658                                                 MLX4_CQE_OPCODE_ERROR)) {
 659                         en_err(priv, "CQE completed in error - vendor "
 660                                   "syndrom:%d syndrom:%d\n",
 661                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 662                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 663                         goto next;
 664                 }
 665                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 666                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 667                         goto next;
 668                 }
 669
 670                 /* Check if we need to drop the packet if SRIOV is not enabled
 671                  * and not performing the selftest or flb disabled
 672                  */
 673                 if (priv->flags & MLX4_EN_FLAG_RX_FILTER_NEEDED) {
 674                         struct ethhdr *ethh;
 675                         dma_addr_t dma;
 676                         /* Get pointer to first fragment since we haven't
 677                          * skb yet and cast it to ethhdr struct
 678                          */
 679                         dma = be64_to_cpu(rx_desc->data[0].addr);
 680                         dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
 681                                                 DMA_FROM_DEVICE);
 682                         ethh = (struct ethhdr *)(page_address(frags[0].page) +
 683                                                  frags[0].page_offset);
 684
 685                         if (is_multicast_ether_addr(ethh->h_dest)) {
 686                                 struct mlx4_mac_entry *entry;
 687                                 struct hlist_head *bucket;
 688                                 unsigned int mac_hash;
 689
 690                                 /* Drop the packet, since HW loopback-ed it */
 691                                 mac_hash = ethh->h_source[MLX4_EN_MAC_HASH_IDX];
 692                                 bucket = &priv->mac_hash[mac_hash];
 693                                 rcu_read_lock();
 694                                 hlist_for_each_entry_rcu(entry, bucket, hlist) {
 695                                         if (ether_addr_equal_64bits(entry->mac,
 696                                                                     ethh->h_source)) {
 697                                                 rcu_read_unlock();
 698                                                 goto next;
 699                                         }
 700                                 }
 701                                 rcu_read_unlock();
 702                         }
 703                 }
 704
 705                 /*
 706                  * Packet is OK - process it.
 707                  */
 708                 length = be32_to_cpu(cqe->byte_cnt);
 709                 length -= ring->fcs_del;
 710                 ring->bytes += length;
 711                 ring->packets++;
 712
 713                 if (likely(dev->features & NETIF_F_RXCSUM)) {
 714                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 715                             (cqe->checksum == cpu_to_be16(0xffff))) {
 716                                 ring->csum_ok++;
 717                                 /* This packet is eligible for GRO if it is:
 718                                  * - DIX Ethernet (type interpretation)
 719                                  * - TCP/IP (v4)
 720                                  * - without IP options
 721                                  * - not an IP fragment
 722                                  * - no LLS polling in progress
 723                                  */
 724                                 if (!mlx4_en_cq_ll_polling(cq) &&
 725                                     (dev->features & NETIF_F_GRO)) {
 726                                         struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
 727                                         if (!gro_skb)
 728                                                 goto next;
 729
 730                                         nr = mlx4_en_complete_rx_desc(priv,
 731                                                 rx_desc, frags, gro_skb,
 732                                                 length);
 733                                         if (!nr)
 734                                                 goto next;
 735
 736                                         skb_shinfo(gro_skb)->nr_frags = nr;
 737                                         gro_skb->len = length;
 738                                         gro_skb->data_len = length;
 739                                         gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
 740
 741                                         if ((cqe->vlan_my_qpn &
 742                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) &&
 743                                             (dev->features & NETIF_F_HW_VLAN_CTAG_RX)) {
 744                                                 u16 vid = be16_to_cpu(cqe->sl_vid);
 745
 746                                                 __vlan_hwaccel_put_tag(gro_skb, htons(ETH_P_8021Q), vid);
 747                                         }
 748
 749                                         if (dev->features & NETIF_F_RXHASH)
 750                                                 gro_skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
 751
 752                                         skb_record_rx_queue(gro_skb, cq->ring);
 753
 754                                         if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
 755                                                 timestamp = mlx4_en_get_cqe_ts(cqe);
 756                                                 mlx4_en_fill_hwtstamps(mdev,
 757                                                                        skb_hwtstamps(gro_skb),
 758                                                                        timestamp);
 759                                         }
 760
 761                                         napi_gro_frags(&cq->napi);
 762                                         goto next;
 763                                 }
 764
 765                                 /* GRO not possible, complete processing here */
 766                                 ip_summed = CHECKSUM_UNNECESSARY;
 767                         } else {
 768                                 ip_summed = CHECKSUM_NONE;
 769                                 ring->csum_none++;
 770                         }
 771                 } else {
 772                         ip_summed = CHECKSUM_NONE;
 773                         ring->csum_none++;
 774                 }
 775
 776                 skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
 777                 if (!skb) {
 778                         priv->stats.rx_dropped++;
 779                         goto next;
 780                 }
 781
 782                 if (unlikely(priv->validate_loopback)) {
 783                         validate_loopback(priv, skb);
 784                         goto next;
 785                 }
 786
 787                 skb->ip_summed = ip_summed;
 788                 skb->protocol = eth_type_trans(skb, dev);
 789                 skb_record_rx_queue(skb, cq->ring);
 790
 791                 if (dev->features & NETIF_F_RXHASH)
 792                         skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
 793
 794                 if ((be32_to_cpu(cqe->vlan_my_qpn) &
 795                     MLX4_CQE_VLAN_PRESENT_MASK) &&
 796                     (dev->features & NETIF_F_HW_VLAN_CTAG_RX))
 797                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), be16_to_cpu(cqe->sl_vid));
 798
 799                 if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
 800                         timestamp = mlx4_en_get_cqe_ts(cqe);
 801                         mlx4_en_fill_hwtstamps(mdev, skb_hwtstamps(skb),
 802                                                timestamp);
 803                 }
 804
 805                 skb_mark_napi_id(skb, &cq->napi);
 806
 807                 /* Push it up the stack */
 808                 netif_receive_skb(skb);
 809
 810 next:
 811                 for (nr = 0; nr < priv->num_frags; nr++)
 812                         mlx4_en_free_frag(priv, frags, nr);
 813
 814                 ++cq->mcq.cons_index;
 815                 index = (cq->mcq.cons_index) & ring->size_mask;
 816                 cqe = &cq->buf[(index << factor) + factor];
 817                 if (++polled == budget)
 818                         goto out;
 819         }
 820
 821 out:
 822         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 823         mlx4_cq_set_ci(&cq->mcq);
 824         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 825         ring->cons = cq->mcq.cons_index;
 826         mlx4_en_refill_rx_buffers(priv, ring);
 827         mlx4_en_update_rx_prod_db(ring);
 828         return polled;
 829 }
 830
 831
 832 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 833 {
 834         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 835         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 836
 837         if (priv->port_up)
 838                 napi_schedule(&cq->napi);
 839         else
 840                 mlx4_en_arm_cq(priv, cq);
 841 }
 842
 843 /* Rx CQ polling - called by NAPI */
 844 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 845 {
 846         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 847         struct net_device *dev = cq->dev;
 848         struct mlx4_en_priv *priv = netdev_priv(dev);
 849         int done;
 850
 851         if (!mlx4_en_cq_lock_napi(cq))
 852                 return budget;
 853
 854         done = mlx4_en_process_rx_cq(dev, cq, budget);
 855
 856         mlx4_en_cq_unlock_napi(cq);
 857
 858         /* If we used up all the quota - we're probably not done yet... */
 859         if (done == budget)
 860                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 861         else {
 862                 /* Done for now */
 863                 napi_complete(napi);
 864                 mlx4_en_arm_cq(priv, cq);
 865         }
 866         return done;
 867 }
 868
 869 static const int frag_sizes[] = {
 870         FRAG_SZ0,
 871         FRAG_SZ1,
 872         FRAG_SZ2,
 873         FRAG_SZ3
 874 };
 875
 876 void mlx4_en_calc_rx_buf(struct net_device *dev)
 877 {
 878         struct mlx4_en_priv *priv = netdev_priv(dev);
 879         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 880         int buf_size = 0;
 881         int i = 0;
 882
 883         while (buf_size < eff_mtu) {
 884                 priv->frag_info[i].frag_size =
 885                         (eff_mtu > buf_size + frag_sizes[i]) ?
 886                                 frag_sizes[i] : eff_mtu - buf_size;
 887                 priv->frag_info[i].frag_prefix_size = buf_size;
 888                 if (!i) {
 889                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 890                         priv->frag_info[i].frag_stride =
 891                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 892                 } else {
 893                         priv->frag_info[i].frag_align = 0;
 894                         priv->frag_info[i].frag_stride =
 895                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 896                 }
 897                 buf_size += priv->frag_info[i].frag_size;
 898                 i++;
 899         }
 900
 901         priv->num_frags = i;
 902         priv->rx_skb_size = eff_mtu;
 903         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
 904
 905         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 906                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 907         for (i = 0; i < priv->num_frags; i++) {
 908                 en_err(priv,
 909                        "  frag:%d - size:%d prefix:%d align:%d stride:%d\n",
 910                        i,
 911                        priv->frag_info[i].frag_size,
 912                        priv->frag_info[i].frag_prefix_size,
 913                        priv->frag_info[i].frag_align,
 914                        priv->frag_info[i].frag_stride);
 915         }
 916 }
 917
 918 /* RSS related functions */
 919
 920 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
 921                                  struct mlx4_en_rx_ring *ring,
 922                                  enum mlx4_qp_state *state,
 923                                  struct mlx4_qp *qp)
 924 {
 925         struct mlx4_en_dev *mdev = priv->mdev;
 926         struct mlx4_qp_context *context;
 927         int err = 0;
 928
 929         context = kmalloc(sizeof(*context), GFP_KERNEL);
 930         if (!context)
 931                 return -ENOMEM;
 932
 933         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 934         if (err) {
 935                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 936                 goto out;
 937         }
 938         qp->event = mlx4_en_sqp_event;
 939
 940         memset(context, 0, sizeof *context);
 941         mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
 942                                 qpn, ring->cqn, -1, context);
 943         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
 944
 945         /* Cancel FCS removal if FW allows */
 946         if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
 947                 context->param3 |= cpu_to_be32(1 << 29);
 948                 ring->fcs_del = ETH_FCS_LEN;
 949         } else
 950                 ring->fcs_del = 0;
 951
 952         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
 953         if (err) {
 954                 mlx4_qp_remove(mdev->dev, qp);
 955                 mlx4_qp_free(mdev->dev, qp);
 956         }
 957         mlx4_en_update_rx_prod_db(ring);
 958 out:
 959         kfree(context);
 960         return err;
 961 }
 962
 963 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
 964 {
 965         int err;
 966         u32 qpn;
 967
 968         err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn);
 969         if (err) {
 970                 en_err(priv, "Failed reserving drop qpn\n");
 971                 return err;
 972         }
 973         err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp);
 974         if (err) {
 975                 en_err(priv, "Failed allocating drop qp\n");
 976                 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
 977                 return err;
 978         }
 979
 980         return 0;
 981 }
 982
 983 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
 984 {
 985         u32 qpn;
 986
 987         qpn = priv->drop_qp.qpn;
 988         mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
 989         mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
 990         mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
 991 }
 992
 993 /* Allocate rx qp's and configure them according to rss map */
 994 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 995 {
 996         struct mlx4_en_dev *mdev = priv->mdev;
 997         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 998         struct mlx4_qp_context context;
 999         struct mlx4_rss_context *rss_context;
1000         int rss_rings;
1001         void *ptr;
1002         u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
1003                         MLX4_RSS_TCP_IPV6);
1004         int i, qpn;
1005         int err = 0;
1006         int good_qps = 0;
1007         static const u32 rsskey[10] = { 0xD181C62C, 0xF7F4DB5B, 0x1983A2FC,
1008                                 0x943E1ADB, 0xD9389E6B, 0xD1039C2C, 0xA74499AD,
1009                                 0x593D56D9, 0xF3253C06, 0x2ADC1FFC};
1010
1011         en_dbg(DRV, priv, "Configuring rss steering\n");
1012         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
1013                                     priv->rx_ring_num,
1014                                     &rss_map->base_qpn);
1015         if (err) {
1016                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
1017                 return err;
1018         }
1019
1020         for (i = 0; i < priv->rx_ring_num; i++) {
1021                 qpn = rss_map->base_qpn + i;
1022                 err = mlx4_en_config_rss_qp(priv, qpn, priv->rx_ring[i],
1023                                             &rss_map->state[i],
1024                                             &rss_map->qps[i]);
1025                 if (err)
1026                         goto rss_err;
1027
1028                 ++good_qps;
1029         }
1030
1031         /* Configure RSS indirection qp */
1032         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
1033         if (err) {
1034                 en_err(priv, "Failed to allocate RSS indirection QP\n");
1035                 goto rss_err;
1036         }
1037         rss_map->indir_qp.event = mlx4_en_sqp_event;
1038         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1039                                 priv->rx_ring[0]->cqn, -1, &context);
1040
1041         if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
1042                 rss_rings = priv->rx_ring_num;
1043         else
1044                 rss_rings = priv->prof->rss_rings;
1045
1046         ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
1047                                         + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
1048         rss_context = ptr;
1049         rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
1050                                             (rss_map->base_qpn));
1051         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1052         if (priv->mdev->profile.udp_rss) {
1053                 rss_mask |=  MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
1054                 rss_context->base_qpn_udp = rss_context->default_qpn;
1055         }
1056         rss_context->flags = rss_mask;
1057         rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1058         for (i = 0; i < 10; i++)
1059                 rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
1060
1061         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1062                                &rss_map->indir_qp, &rss_map->indir_state);
1063         if (err)
1064                 goto indir_err;
1065
1066         return 0;
1067
1068 indir_err:
1069         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1070                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1071         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1072         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1073 rss_err:
1074         for (i = 0; i < good_qps; i++) {
1075                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1076                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1077                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1078                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1079         }
1080         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1081         return err;
1082 }
1083
1084 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1085 {
1086         struct mlx4_en_dev *mdev = priv->mdev;
1087         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1088         int i;
1089
1090         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1091                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1092         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1093         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1094
1095         for (i = 0; i < priv->rx_ring_num; i++) {
1096                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1097                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1098                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1099                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1100         }
1101         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1102 }