SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         if (nr > 0)
 466                 skb_frags_rx[nr - 1].size = length -
 467                         priv->frag_info[nr - 1].frag_prefix_size;
 468         return nr;
 469
 470 fail:
 471         /* Drop all accumulated fragments (which have already been replaced in
 472          * the descriptor) of this packet; remaining fragments are reused... */
 473         while (nr > 0) {
 474                 nr--;
 475                 put_page(skb_frags_rx[nr].page);
 476         }
 477         return 0;
 478 }
 479
 480
 481 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 482                                       struct mlx4_en_rx_desc *rx_desc,
 483                                       struct skb_frag_struct *skb_frags,
 484                                       struct mlx4_en_rx_alloc *page_alloc,
 485                                       unsigned int length)
 486 {
 487         struct mlx4_en_dev *mdev = priv->mdev;
 488         struct sk_buff *skb;
 489         void *va;
 490         int used_frags;
 491         dma_addr_t dma;
 492
 493         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 494         if (!skb) {
 495                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 496                 return NULL;
 497         }
 498         skb->dev = priv->dev;
 499         skb_reserve(skb, NET_IP_ALIGN);
 500         skb->len = length;
 501         skb->truesize = length + sizeof(struct sk_buff);
 502
 503         /* Get pointer to first fragment so we could copy the headers into the
 504          * (linear part of the) skb */
 505         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 506
 507         if (length <= SMALL_PACKET_SIZE) {
 508                 /* We are copying all relevant data to the skb - temporarily
 509                  * synch buffers for the copy */
 510                 dma = be64_to_cpu(rx_desc->data[0].addr);
 511                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 512                                               length, DMA_FROM_DEVICE);
 513                 skb_copy_to_linear_data(skb, va, length);
 514                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 515                                                  length, DMA_FROM_DEVICE);
 516                 skb->tail += length;
 517         } else {
 518
 519                 /* Move relevant fragments to skb */
 520                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 521                                                       skb_shinfo(skb)->frags,
 522                                                       page_alloc, length);
 523                 if (unlikely(!used_frags)) {
 524                         kfree_skb(skb);
 525                         return NULL;
 526                 }
 527                 skb_shinfo(skb)->nr_frags = used_frags;
 528
 529                 /* Copy headers into the skb linear buffer */
 530                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 531                 skb->tail += HEADER_COPY_SIZE;
 532
 533                 /* Skip headers in first fragment */
 534                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 535
 536                 /* Adjust size of first fragment */
 537                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 538                 skb->data_len = length - HEADER_COPY_SIZE;
 539         }
 540         return skb;
 541 }
 542
 543
 544 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 545 {
 546         struct mlx4_en_priv *priv = netdev_priv(dev);
 547         struct mlx4_cqe *cqe;
 548         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 549         struct skb_frag_struct *skb_frags;
 550         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 551         struct mlx4_en_rx_desc *rx_desc;
 552         struct sk_buff *skb;
 553         int index;
 554         int nr;
 555         unsigned int length;
 556         int polled = 0;
 557         int ip_summed;
 558
 559         if (!priv->port_up)
 560                 return 0;
 561
 562         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 563          * descriptor offset can be deduced from the CQE index instead of
 564          * reading 'cqe->index' */
 565         index = cq->mcq.cons_index & ring->size_mask;
 566         cqe = &cq->buf[index];
 567
 568         /* Process all completed CQEs */
 569         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 570                     cq->mcq.cons_index & cq->size)) {
 571
 572                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 573                 rx_desc = ring->buf + (index << ring->log_stride);
 574
 575                 /*
 576                  * make sure we read the CQE after we read the ownership bit
 577                  */
 578                 rmb();
 579
 580                 /* Drop packet on bad receive or bad checksum */
 581                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 582                                                 MLX4_CQE_OPCODE_ERROR)) {
 583                         en_err(priv, "CQE completed in error - vendor "
 584                                   "syndrom:%d syndrom:%d\n",
 585                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 586                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 587                         goto next;
 588                 }
 589                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 590                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 591                         goto next;
 592                 }
 593
 594                 /*
 595                  * Packet is OK - process it.
 596                  */
 597                 length = be32_to_cpu(cqe->byte_cnt);
 598                 ring->bytes += length;
 599                 ring->packets++;
 600
 601                 if (likely(priv->rx_csum)) {
 602                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 603                             (cqe->checksum == cpu_to_be16(0xffff))) {
 604                                 priv->port_stats.rx_chksum_good++;
 605                                 /* This packet is eligible for LRO if it is:
 606                                  * - DIX Ethernet (type interpretation)
 607                                  * - TCP/IP (v4)
 608                                  * - without IP options
 609                                  * - not an IP fragment */
 610                                 if (mlx4_en_can_lro(cqe->status) &&
 611                                     dev->features & NETIF_F_LRO) {
 612
 613                                         nr = mlx4_en_complete_rx_desc(
 614                                                 priv, rx_desc,
 615                                                 skb_frags, lro_frags,
 616                                                 ring->page_alloc, length);
 617                                         if (!nr)
 618                                                 goto next;
 619
 620                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 621                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 622                                                 lro_vlan_hwaccel_receive_frags(
 623                                                        &ring->lro, lro_frags,
 624                                                        length, length,
 625                                                        priv->vlgrp,
 626                                                        be16_to_cpu(cqe->sl_vid),
 627                                                        NULL, 0);
 628                                         } else
 629                                                 lro_receive_frags(&ring->lro,
 630                                                                   lro_frags,
 631                                                                   length,
 632                                                                   length,
 633                                                                   NULL, 0);
 634
 635                                         goto next;
 636                                 }
 637
 638                                 /* LRO not possible, complete processing here */
 639                                 ip_summed = CHECKSUM_UNNECESSARY;
 640                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 641                         } else {
 642                                 ip_summed = CHECKSUM_NONE;
 643                                 priv->port_stats.rx_chksum_none++;
 644                         }
 645                 } else {
 646                         ip_summed = CHECKSUM_NONE;
 647                         priv->port_stats.rx_chksum_none++;
 648                 }
 649
 650                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 651                                      ring->page_alloc, length);
 652                 if (!skb) {
 653                         priv->stats.rx_dropped++;
 654                         goto next;
 655                 }
 656
 657                 skb->ip_summed = ip_summed;
 658                 skb->protocol = eth_type_trans(skb, dev);
 659                 skb_record_rx_queue(skb, cq->ring);
 660
 661                 /* Push it up the stack */
 662                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 663                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 664                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 665                                                 be16_to_cpu(cqe->sl_vid));
 666                 } else
 667                         netif_receive_skb(skb);
 668
 669 next:
 670                 ++cq->mcq.cons_index;
 671                 index = (cq->mcq.cons_index) & ring->size_mask;
 672                 cqe = &cq->buf[index];
 673                 if (++polled == budget) {
 674                         /* We are here because we reached the NAPI budget -
 675                          * flush only pending LRO sessions */
 676                         lro_flush_all(&ring->lro);
 677                         goto out;
 678                 }
 679         }
 680
 681         /* If CQ is empty flush all LRO sessions unconditionally */
 682         lro_flush_all(&ring->lro);
 683
 684 out:
 685         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 686         mlx4_cq_set_ci(&cq->mcq);
 687         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 688         ring->cons = cq->mcq.cons_index;
 689         ring->prod += polled; /* Polled descriptors were realocated in place */
 690         mlx4_en_update_rx_prod_db(ring);
 691         return polled;
 692 }
 693
 694
 695 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 696 {
 697         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 698         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 699
 700         if (priv->port_up)
 701                 napi_schedule(&cq->napi);
 702         else
 703                 mlx4_en_arm_cq(priv, cq);
 704 }
 705
 706 /* Rx CQ polling - called by NAPI */
 707 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 708 {
 709         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 710         struct net_device *dev = cq->dev;
 711         struct mlx4_en_priv *priv = netdev_priv(dev);
 712         int done;
 713
 714         done = mlx4_en_process_rx_cq(dev, cq, budget);
 715
 716         /* If we used up all the quota - we're probably not done yet... */
 717         if (done == budget)
 718                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 719         else {
 720                 /* Done for now */
 721                 napi_complete(napi);
 722                 mlx4_en_arm_cq(priv, cq);
 723         }
 724         return done;
 725 }
 726
 727
 728 /* Calculate the last offset position that accomodates a full fragment
 729  * (assuming fagment size = stride-align) */
 730 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 731 {
 732         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 733         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 734
 735         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 736                             "res:%d offset:%d\n", stride, align, res, offset);
 737         return offset;
 738 }
 739
 740
 741 static int frag_sizes[] = {
 742         FRAG_SZ0,
 743         FRAG_SZ1,
 744         FRAG_SZ2,
 745         FRAG_SZ3
 746 };
 747
 748 void mlx4_en_calc_rx_buf(struct net_device *dev)
 749 {
 750         struct mlx4_en_priv *priv = netdev_priv(dev);
 751         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 752         int buf_size = 0;
 753         int i = 0;
 754
 755         while (buf_size < eff_mtu) {
 756                 priv->frag_info[i].frag_size =
 757                         (eff_mtu > buf_size + frag_sizes[i]) ?
 758                                 frag_sizes[i] : eff_mtu - buf_size;
 759                 priv->frag_info[i].frag_prefix_size = buf_size;
 760                 if (!i) {
 761                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 762                         priv->frag_info[i].frag_stride =
 763                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 764                 } else {
 765                         priv->frag_info[i].frag_align = 0;
 766                         priv->frag_info[i].frag_stride =
 767                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 768                 }
 769                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 770                                                 priv, priv->frag_info[i].frag_stride,
 771                                                 priv->frag_info[i].frag_align);
 772                 buf_size += priv->frag_info[i].frag_size;
 773                 i++;
 774         }
 775
 776         priv->num_frags = i;
 777         priv->rx_skb_size = eff_mtu;
 778         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 779
 780         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 781                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 782         for (i = 0; i < priv->num_frags; i++) {
 783                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 784                                 "stride:%d last_offset:%d\n", i,
 785                                 priv->frag_info[i].frag_size,
 786                                 priv->frag_info[i].frag_prefix_size,
 787                                 priv->frag_info[i].frag_align,
 788                                 priv->frag_info[i].frag_stride,
 789                                 priv->frag_info[i].last_offset);
 790         }
 791 }
 792
 793 /* RSS related functions */
 794
 795 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
 796                                  struct mlx4_en_rx_ring *ring,
 797                                  enum mlx4_qp_state *state,
 798                                  struct mlx4_qp *qp)
 799 {
 800         struct mlx4_en_dev *mdev = priv->mdev;
 801         struct mlx4_qp_context *context;
 802         int err = 0;
 803
 804         context = kmalloc(sizeof *context , GFP_KERNEL);
 805         if (!context) {
 806                 en_err(priv, "Failed to allocate qp context\n");
 807                 return -ENOMEM;
 808         }
 809
 810         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 811         if (err) {
 812                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 813                 goto out;
 814         }
 815         qp->event = mlx4_en_sqp_event;
 816
 817         memset(context, 0, sizeof *context);
 818         mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 0, 0,
 819                                 qpn, ring->cqn, context);
 820         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
 821
 822         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
 823         if (err) {
 824                 mlx4_qp_remove(mdev->dev, qp);
 825                 mlx4_qp_free(mdev->dev, qp);
 826         }
 827         mlx4_en_update_rx_prod_db(ring);
 828 out:
 829         kfree(context);
 830         return err;
 831 }
 832
 833 /* Allocate rx qp's and configure them according to rss map */
 834 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 835 {
 836         struct mlx4_en_dev *mdev = priv->mdev;
 837         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 838         struct mlx4_qp_context context;
 839         struct mlx4_en_rss_context *rss_context;
 840         void *ptr;
 841         int rss_xor = mdev->profile.rss_xor;
 842         u8 rss_mask = mdev->profile.rss_mask;
 843         int i, qpn;
 844         int err = 0;
 845         int good_qps = 0;
 846
 847         en_dbg(DRV, priv, "Configuring rss steering\n");
 848         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
 849                                     priv->rx_ring_num,
 850                                     &rss_map->base_qpn);
 851         if (err) {
 852                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
 853                 return err;
 854         }
 855
 856         for (i = 0; i < priv->rx_ring_num; i++) {
 857                 qpn = rss_map->base_qpn + i;
 858                 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
 859                                             &rss_map->state[i],
 860                                             &rss_map->qps[i]);
 861                 if (err)
 862                         goto rss_err;
 863
 864                 ++good_qps;
 865         }
 866
 867         /* Configure RSS indirection qp */
 868         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
 869         if (err) {
 870                 en_err(priv, "Failed to reserve range for RSS "
 871                              "indirection qp\n");
 872                 goto rss_err;
 873         }
 874         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
 875         if (err) {
 876                 en_err(priv, "Failed to allocate RSS indirection QP\n");
 877                 goto reserve_err;
 878         }
 879         rss_map->indir_qp.event = mlx4_en_sqp_event;
 880         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
 881                                 priv->rx_ring[0].cqn, &context);
 882
 883         ptr = ((void *) &context) + 0x3c;
 884         rss_context = (struct mlx4_en_rss_context *) ptr;
 885         rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 |
 886                                             (rss_map->base_qpn));
 887         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
 888         rss_context->hash_fn = rss_xor & 0x3;
 889         rss_context->flags = rss_mask << 2;
 890
 891         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
 892                                &rss_map->indir_qp, &rss_map->indir_state);
 893         if (err)
 894                 goto indir_err;
 895
 896         return 0;
 897
 898 indir_err:
 899         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 900                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 901         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 902         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 903 reserve_err:
 904         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 905 rss_err:
 906         for (i = 0; i < good_qps; i++) {
 907                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 908                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 909                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 910                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 911         }
 912         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 913         return err;
 914 }
 915
 916 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
 917 {
 918         struct mlx4_en_dev *mdev = priv->mdev;
 919         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 920         int i;
 921
 922         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 923                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 924         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 925         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 926         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 927
 928         for (i = 0; i < priv->rx_ring_num; i++) {
 929                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 930                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 931                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 932                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 933         }
 934         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
 935 }
 936
 937
 938
 939
 940