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 static void *get_wqe(struct mlx4_en_rx_ring *ring, int n)
  44 {
  45         int offset = n << ring->srq.wqe_shift;
  46         return ring->buf + offset;
  47 }
  48
  49 static void mlx4_en_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  50 {
  51         return;
  52 }
  53
  54 static int mlx4_en_get_frag_header(struct skb_frag_struct *frags, void **mac_hdr,
  55                                    void **ip_hdr, void **tcpudp_hdr,
  56                                    u64 *hdr_flags, void *priv)
  57 {
  58         *mac_hdr = page_address(frags->page) + frags->page_offset;
  59         *ip_hdr = *mac_hdr + ETH_HLEN;
  60         *tcpudp_hdr = (struct tcphdr *)(*ip_hdr + sizeof(struct iphdr));
  61         *hdr_flags = LRO_IPV4 | LRO_TCP;
  62
  63         return 0;
  64 }
  65
  66 static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
  67                               struct mlx4_en_rx_desc *rx_desc,
  68                               struct skb_frag_struct *skb_frags,
  69                               struct mlx4_en_rx_alloc *ring_alloc,
  70                               int i)
  71 {
  72         struct mlx4_en_dev *mdev = priv->mdev;
  73         struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
  74         struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
  75         struct page *page;
  76         dma_addr_t dma;
  77
  78         if (page_alloc->offset == frag_info->last_offset) {
  79                 /* Allocate new page */
  80                 page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
  81                 if (!page)
  82                         return -ENOMEM;
  83
  84                 skb_frags[i].page = page_alloc->page;
  85                 skb_frags[i].page_offset = page_alloc->offset;
  86                 page_alloc->page = page;
  87                 page_alloc->offset = frag_info->frag_align;
  88         } else {
  89                 page = page_alloc->page;
  90                 get_page(page);
  91
  92                 skb_frags[i].page = page;
  93                 skb_frags[i].page_offset = page_alloc->offset;
  94                 page_alloc->offset += frag_info->frag_stride;
  95         }
  96         dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) +
  97                              skb_frags[i].page_offset, frag_info->frag_size,
  98                              PCI_DMA_FROMDEVICE);
  99         rx_desc->data[i].addr = cpu_to_be64(dma);
 100         return 0;
 101 }
 102
 103 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
 104                                   struct mlx4_en_rx_ring *ring)
 105 {
 106         struct mlx4_en_rx_alloc *page_alloc;
 107         int i;
 108
 109         for (i = 0; i < priv->num_frags; i++) {
 110                 page_alloc = &ring->page_alloc[i];
 111                 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
 112                                                MLX4_EN_ALLOC_ORDER);
 113                 if (!page_alloc->page)
 114                         goto out;
 115
 116                 page_alloc->offset = priv->frag_info[i].frag_align;
 117                 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
 118                        i, page_alloc->page);
 119         }
 120         return 0;
 121
 122 out:
 123         while (i--) {
 124                 page_alloc = &ring->page_alloc[i];
 125                 put_page(page_alloc->page);
 126                 page_alloc->page = NULL;
 127         }
 128         return -ENOMEM;
 129 }
 130
 131 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 132                                       struct mlx4_en_rx_ring *ring)
 133 {
 134         struct mlx4_en_rx_alloc *page_alloc;
 135         int i;
 136
 137         for (i = 0; i < priv->num_frags; i++) {
 138                 page_alloc = &ring->page_alloc[i];
 139                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 140                        i, page_count(page_alloc->page));
 141
 142                 put_page(page_alloc->page);
 143                 page_alloc->page = NULL;
 144         }
 145 }
 146
 147
 148 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 149                                  struct mlx4_en_rx_ring *ring, int index)
 150 {
 151         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 152         struct skb_frag_struct *skb_frags = ring->rx_info +
 153                                             (index << priv->log_rx_info);
 154         int possible_frags;
 155         int i;
 156
 157         /* Pre-link descriptor */
 158         rx_desc->next.next_wqe_index = cpu_to_be16((index + 1) & ring->size_mask);
 159
 160         /* Set size and memtype fields */
 161         for (i = 0; i < priv->num_frags; i++) {
 162                 skb_frags[i].size = priv->frag_info[i].frag_size;
 163                 rx_desc->data[i].byte_count =
 164                         cpu_to_be32(priv->frag_info[i].frag_size);
 165                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 166         }
 167
 168         /* If the number of used fragments does not fill up the ring stride,
 169          * remaining (unused) fragments must be padded with null address/size
 170          * and a special memory key */
 171         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 172         for (i = priv->num_frags; i < possible_frags; i++) {
 173                 rx_desc->data[i].byte_count = 0;
 174                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 175                 rx_desc->data[i].addr = 0;
 176         }
 177 }
 178
 179
 180 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 181                                    struct mlx4_en_rx_ring *ring, int index)
 182 {
 183         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 184         struct skb_frag_struct *skb_frags = ring->rx_info +
 185                                             (index << priv->log_rx_info);
 186         int i;
 187
 188         for (i = 0; i < priv->num_frags; i++)
 189                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
 190                         goto err;
 191
 192         return 0;
 193
 194 err:
 195         while (i--)
 196                 put_page(skb_frags[i].page);
 197         return -ENOMEM;
 198 }
 199
 200 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 201 {
 202         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 203 }
 204
 205 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 206                                  struct mlx4_en_rx_ring *ring,
 207                                  int index)
 208 {
 209         struct mlx4_en_dev *mdev = priv->mdev;
 210         struct skb_frag_struct *skb_frags;
 211         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
 212         dma_addr_t dma;
 213         int nr;
 214
 215         skb_frags = ring->rx_info + (index << priv->log_rx_info);
 216         for (nr = 0; nr < priv->num_frags; nr++) {
 217                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 218                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 219
 220                 en_dbg(DRV, priv, "Unmaping buffer at dma:0x%llx\n", (u64) dma);
 221                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 222                                  PCI_DMA_FROMDEVICE);
 223                 put_page(skb_frags[nr].page);
 224         }
 225 }
 226
 227 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 228 {
 229         struct mlx4_en_rx_ring *ring;
 230         int ring_ind;
 231         int buf_ind;
 232         int new_size;
 233
 234         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 235                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 236                         ring = &priv->rx_ring[ring_ind];
 237
 238                         if (mlx4_en_prepare_rx_desc(priv, ring,
 239                                                     ring->actual_size)) {
 240                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 241                                         en_err(priv, "Failed to allocate "
 242                                                      "enough rx buffers\n");
 243                                         return -ENOMEM;
 244                                 } else {
 245                                         new_size = rounddown_pow_of_two(ring->actual_size);
 246                                         en_warn(priv, "Only %d buffers allocated "
 247                                                       "reducing ring size to %d",
 248                                                 ring->actual_size, new_size);
 249                                         goto reduce_rings;
 250                                 }
 251                         }
 252                         ring->actual_size++;
 253                         ring->prod++;
 254                 }
 255         }
 256         return 0;
 257
 258 reduce_rings:
 259         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 260                 ring = &priv->rx_ring[ring_ind];
 261                 while (ring->actual_size > new_size) {
 262                         ring->actual_size--;
 263                         ring->prod--;
 264                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 265                 }
 266                 ring->size_mask = ring->actual_size - 1;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 273                                 struct mlx4_en_rx_ring *ring)
 274 {
 275         int index;
 276
 277         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 278                ring->cons, ring->prod);
 279
 280         /* Unmap and free Rx buffers */
 281         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 282         while (ring->cons != ring->prod) {
 283                 index = ring->cons & ring->size_mask;
 284                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 285                 mlx4_en_free_rx_desc(priv, ring, index);
 286                 ++ring->cons;
 287         }
 288 }
 289
 290 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 291                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 292 {
 293         struct mlx4_en_dev *mdev = priv->mdev;
 294         int err;
 295         int tmp;
 296
 297         /* Sanity check SRQ size before proceeding */
 298         if (size >= mdev->dev->caps.max_srq_wqes)
 299                 return -EINVAL;
 300
 301         ring->prod = 0;
 302         ring->cons = 0;
 303         ring->size = size;
 304         ring->size_mask = size - 1;
 305         ring->stride = stride;
 306         ring->log_stride = ffs(ring->stride) - 1;
 307         ring->buf_size = ring->size * ring->stride;
 308
 309         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 310                                         sizeof(struct skb_frag_struct));
 311         ring->rx_info = vmalloc(tmp);
 312         if (!ring->rx_info) {
 313                 en_err(priv, "Failed allocating rx_info ring\n");
 314                 return -ENOMEM;
 315         }
 316         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 317                  ring->rx_info, tmp);
 318
 319         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 320                                  ring->buf_size, 2 * PAGE_SIZE);
 321         if (err)
 322                 goto err_ring;
 323
 324         err = mlx4_en_map_buffer(&ring->wqres.buf);
 325         if (err) {
 326                 en_err(priv, "Failed to map RX buffer\n");
 327                 goto err_hwq;
 328         }
 329         ring->buf = ring->wqres.buf.direct.buf;
 330
 331         /* Configure lro mngr */
 332         memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
 333         ring->lro.dev = priv->dev;
 334         ring->lro.features = LRO_F_NAPI;
 335         ring->lro.frag_align_pad = NET_IP_ALIGN;
 336         ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
 337         ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 338         ring->lro.max_desc = mdev->profile.num_lro;
 339         ring->lro.max_aggr = MAX_SKB_FRAGS;
 340         ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
 341                                     sizeof(struct net_lro_desc),
 342                                     GFP_KERNEL);
 343         if (!ring->lro.lro_arr) {
 344                 en_err(priv, "Failed to allocate lro array\n");
 345                 goto err_map;
 346         }
 347         ring->lro.get_frag_header = mlx4_en_get_frag_header;
 348
 349         return 0;
 350
 351 err_map:
 352         mlx4_en_unmap_buffer(&ring->wqres.buf);
 353 err_hwq:
 354         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 355 err_ring:
 356         vfree(ring->rx_info);
 357         ring->rx_info = NULL;
 358         return err;
 359 }
 360
 361 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 362 {
 363         struct mlx4_en_dev *mdev = priv->mdev;
 364         struct mlx4_wqe_srq_next_seg *next;
 365         struct mlx4_en_rx_ring *ring;
 366         int i;
 367         int ring_ind;
 368         int err;
 369         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 370                                         DS_SIZE * priv->num_frags);
 371         int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE;
 372
 373         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 374                 ring = &priv->rx_ring[ring_ind];
 375
 376                 ring->prod = 0;
 377                 ring->cons = 0;
 378                 ring->actual_size = 0;
 379                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 380
 381                 ring->stride = stride;
 382                 ring->log_stride = ffs(ring->stride) - 1;
 383                 ring->buf_size = ring->size * ring->stride;
 384
 385                 memset(ring->buf, 0, ring->buf_size);
 386                 mlx4_en_update_rx_prod_db(ring);
 387
 388                 /* Initailize all descriptors */
 389                 for (i = 0; i < ring->size; i++)
 390                         mlx4_en_init_rx_desc(priv, ring, i);
 391
 392                 /* Initialize page allocators */
 393                 err = mlx4_en_init_allocator(priv, ring);
 394                 if (err) {
 395                         en_err(priv, "Failed initializing ring allocator\n");
 396                         ring_ind--;
 397                         goto err_allocator;
 398                 }
 399         }
 400         err = mlx4_en_fill_rx_buffers(priv);
 401         if (err)
 402                 goto err_buffers;
 403
 404         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 405                 ring = &priv->rx_ring[ring_ind];
 406
 407                 mlx4_en_update_rx_prod_db(ring);
 408
 409                 /* Configure SRQ representing the ring */
 410                 ring->srq.max    = ring->actual_size;
 411                 ring->srq.max_gs = max_gs;
 412                 ring->srq.wqe_shift = ilog2(ring->stride);
 413
 414                 for (i = 0; i < ring->srq.max; ++i) {
 415                         next = get_wqe(ring, i);
 416                         next->next_wqe_index =
 417                         cpu_to_be16((i + 1) & (ring->srq.max - 1));
 418                 }
 419
 420                 err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt,
 421                                      ring->wqres.db.dma, &ring->srq);
 422                 if (err){
 423                         en_err(priv, "Failed to allocate srq\n");
 424                         ring_ind--;
 425                         goto err_srq;
 426                 }
 427                 ring->srq.event = mlx4_en_srq_event;
 428         }
 429
 430         return 0;
 431
 432 err_srq:
 433         while (ring_ind >= 0) {
 434                 ring = &priv->rx_ring[ring_ind];
 435                 mlx4_srq_free(mdev->dev, &ring->srq);
 436                 ring_ind--;
 437         }
 438
 439 err_buffers:
 440         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 441                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 442
 443         ring_ind = priv->rx_ring_num - 1;
 444 err_allocator:
 445         while (ring_ind >= 0) {
 446                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 447                 ring_ind--;
 448         }
 449         return err;
 450 }
 451
 452 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 453                              struct mlx4_en_rx_ring *ring)
 454 {
 455         struct mlx4_en_dev *mdev = priv->mdev;
 456
 457         kfree(ring->lro.lro_arr);
 458         mlx4_en_unmap_buffer(&ring->wqres.buf);
 459         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 460         vfree(ring->rx_info);
 461         ring->rx_info = NULL;
 462 }
 463
 464 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 465                                 struct mlx4_en_rx_ring *ring)
 466 {
 467         struct mlx4_en_dev *mdev = priv->mdev;
 468
 469         mlx4_srq_free(mdev->dev, &ring->srq);
 470         mlx4_en_free_rx_buf(priv, ring);
 471         mlx4_en_destroy_allocator(priv, ring);
 472 }
 473
 474
 475 /* Unmap a completed descriptor and free unused pages */
 476 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 477                                     struct mlx4_en_rx_desc *rx_desc,
 478                                     struct skb_frag_struct *skb_frags,
 479                                     struct skb_frag_struct *skb_frags_rx,
 480                                     struct mlx4_en_rx_alloc *page_alloc,
 481                                     int length)
 482 {
 483         struct mlx4_en_dev *mdev = priv->mdev;
 484         struct mlx4_en_frag_info *frag_info;
 485         int nr;
 486         dma_addr_t dma;
 487
 488         /* Collect used fragments while replacing them in the HW descirptors */
 489         for (nr = 0; nr < priv->num_frags; nr++) {
 490                 frag_info = &priv->frag_info[nr];
 491                 if (length <= frag_info->frag_prefix_size)
 492                         break;
 493
 494                 /* Save page reference in skb */
 495                 skb_frags_rx[nr].page = skb_frags[nr].page;
 496                 skb_frags_rx[nr].size = skb_frags[nr].size;
 497                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 498                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 499
 500                 /* Allocate a replacement page */
 501                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 502                         goto fail;
 503
 504                 /* Unmap buffer */
 505                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 506                                  PCI_DMA_FROMDEVICE);
 507         }
 508         /* Adjust size of last fragment to match actual length */
 509         skb_frags_rx[nr - 1].size = length -
 510                 priv->frag_info[nr - 1].frag_prefix_size;
 511         return nr;
 512
 513 fail:
 514         /* Drop all accumulated fragments (which have already been replaced in
 515          * the descriptor) of this packet; remaining fragments are reused... */
 516         while (nr > 0) {
 517                 nr--;
 518                 put_page(skb_frags_rx[nr].page);
 519         }
 520         return 0;
 521 }
 522
 523
 524 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 525                                       struct mlx4_en_rx_desc *rx_desc,
 526                                       struct skb_frag_struct *skb_frags,
 527                                       struct mlx4_en_rx_alloc *page_alloc,
 528                                       unsigned int length)
 529 {
 530         struct mlx4_en_dev *mdev = priv->mdev;
 531         struct sk_buff *skb;
 532         void *va;
 533         int used_frags;
 534         dma_addr_t dma;
 535
 536         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 537         if (!skb) {
 538                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 539                 return NULL;
 540         }
 541         skb->dev = priv->dev;
 542         skb_reserve(skb, NET_IP_ALIGN);
 543         skb->len = length;
 544         skb->truesize = length + sizeof(struct sk_buff);
 545
 546         /* Get pointer to first fragment so we could copy the headers into the
 547          * (linear part of the) skb */
 548         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 549
 550         if (length <= SMALL_PACKET_SIZE) {
 551                 /* We are copying all relevant data to the skb - temporarily
 552                  * synch buffers for the copy */
 553                 dma = be64_to_cpu(rx_desc->data[0].addr);
 554                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 555                                               length, DMA_FROM_DEVICE);
 556                 skb_copy_to_linear_data(skb, va, length);
 557                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 558                                                  length, DMA_FROM_DEVICE);
 559                 skb->tail += length;
 560         } else {
 561
 562                 /* Move relevant fragments to skb */
 563                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 564                                                       skb_shinfo(skb)->frags,
 565                                                       page_alloc, length);
 566                 if (unlikely(!used_frags)) {
 567                         kfree_skb(skb);
 568                         return NULL;
 569                 }
 570                 skb_shinfo(skb)->nr_frags = used_frags;
 571
 572                 /* Copy headers into the skb linear buffer */
 573                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 574                 skb->tail += HEADER_COPY_SIZE;
 575
 576                 /* Skip headers in first fragment */
 577                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 578
 579                 /* Adjust size of first fragment */
 580                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 581                 skb->data_len = length - HEADER_COPY_SIZE;
 582         }
 583         return skb;
 584 }
 585
 586
 587 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 588 {
 589         struct mlx4_en_priv *priv = netdev_priv(dev);
 590         struct mlx4_cqe *cqe;
 591         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 592         struct skb_frag_struct *skb_frags;
 593         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 594         struct mlx4_en_rx_desc *rx_desc;
 595         struct sk_buff *skb;
 596         int index;
 597         int nr;
 598         unsigned int length;
 599         int polled = 0;
 600         int ip_summed;
 601
 602         if (!priv->port_up)
 603                 return 0;
 604
 605         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 606          * descriptor offset can be deduced from the CQE index instead of
 607          * reading 'cqe->index' */
 608         index = cq->mcq.cons_index & ring->size_mask;
 609         cqe = &cq->buf[index];
 610
 611         /* Process all completed CQEs */
 612         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 613                     cq->mcq.cons_index & cq->size)) {
 614
 615                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 616                 rx_desc = ring->buf + (index << ring->log_stride);
 617
 618                 /*
 619                  * make sure we read the CQE after we read the ownership bit
 620                  */
 621                 rmb();
 622
 623                 /* Drop packet on bad receive or bad checksum */
 624                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 625                                                 MLX4_CQE_OPCODE_ERROR)) {
 626                         en_err(priv, "CQE completed in error - vendor "
 627                                   "syndrom:%d syndrom:%d\n",
 628                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 629                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 630                         goto next;
 631                 }
 632                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 633                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 634                         goto next;
 635                 }
 636
 637                 /*
 638                  * Packet is OK - process it.
 639                  */
 640                 length = be32_to_cpu(cqe->byte_cnt);
 641                 ring->bytes += length;
 642                 ring->packets++;
 643
 644                 if (likely(priv->rx_csum)) {
 645                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 646                             (cqe->checksum == cpu_to_be16(0xffff))) {
 647                                 priv->port_stats.rx_chksum_good++;
 648                                 /* This packet is eligible for LRO if it is:
 649                                  * - DIX Ethernet (type interpretation)
 650                                  * - TCP/IP (v4)
 651                                  * - without IP options
 652                                  * - not an IP fragment */
 653                                 if (mlx4_en_can_lro(cqe->status) &&
 654                                     dev->features & NETIF_F_LRO) {
 655
 656                                         nr = mlx4_en_complete_rx_desc(
 657                                                 priv, rx_desc,
 658                                                 skb_frags, lro_frags,
 659                                                 ring->page_alloc, length);
 660                                         if (!nr)
 661                                                 goto next;
 662
 663                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 664                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 665                                                 lro_vlan_hwaccel_receive_frags(
 666                                                        &ring->lro, lro_frags,
 667                                                        length, length,
 668                                                        priv->vlgrp,
 669                                                        be16_to_cpu(cqe->sl_vid),
 670                                                        NULL, 0);
 671                                         } else
 672                                                 lro_receive_frags(&ring->lro,
 673                                                                   lro_frags,
 674                                                                   length,
 675                                                                   length,
 676                                                                   NULL, 0);
 677
 678                                         goto next;
 679                                 }
 680
 681                                 /* LRO not possible, complete processing here */
 682                                 ip_summed = CHECKSUM_UNNECESSARY;
 683                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 684                         } else {
 685                                 ip_summed = CHECKSUM_NONE;
 686                                 priv->port_stats.rx_chksum_none++;
 687                         }
 688                 } else {
 689                         ip_summed = CHECKSUM_NONE;
 690                         priv->port_stats.rx_chksum_none++;
 691                 }
 692
 693                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 694                                      ring->page_alloc, length);
 695                 if (!skb) {
 696                         priv->stats.rx_dropped++;
 697                         goto next;
 698                 }
 699
 700                 skb->ip_summed = ip_summed;
 701                 skb->protocol = eth_type_trans(skb, dev);
 702                 skb_record_rx_queue(skb, cq->ring);
 703
 704                 /* Push it up the stack */
 705                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 706                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 707                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 708                                                 be16_to_cpu(cqe->sl_vid));
 709                 } else
 710                         netif_receive_skb(skb);
 711
 712 next:
 713                 ++cq->mcq.cons_index;
 714                 index = (cq->mcq.cons_index) & ring->size_mask;
 715                 cqe = &cq->buf[index];
 716                 if (++polled == budget) {
 717                         /* We are here because we reached the NAPI budget -
 718                          * flush only pending LRO sessions */
 719                         lro_flush_all(&ring->lro);
 720                         goto out;
 721                 }
 722         }
 723
 724         /* If CQ is empty flush all LRO sessions unconditionally */
 725         lro_flush_all(&ring->lro);
 726
 727 out:
 728         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 729         mlx4_cq_set_ci(&cq->mcq);
 730         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 731         ring->cons = cq->mcq.cons_index;
 732         ring->prod += polled; /* Polled descriptors were realocated in place */
 733         mlx4_en_update_rx_prod_db(ring);
 734         return polled;
 735 }
 736
 737
 738 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 739 {
 740         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 741         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 742
 743         if (priv->port_up)
 744                 napi_schedule(&cq->napi);
 745         else
 746                 mlx4_en_arm_cq(priv, cq);
 747 }
 748
 749 /* Rx CQ polling - called by NAPI */
 750 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 751 {
 752         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 753         struct net_device *dev = cq->dev;
 754         struct mlx4_en_priv *priv = netdev_priv(dev);
 755         int done;
 756
 757         done = mlx4_en_process_rx_cq(dev, cq, budget);
 758
 759         /* If we used up all the quota - we're probably not done yet... */
 760         if (done == budget)
 761                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 762         else {
 763                 /* Done for now */
 764                 napi_complete(napi);
 765                 mlx4_en_arm_cq(priv, cq);
 766         }
 767         return done;
 768 }
 769
 770
 771 /* Calculate the last offset position that accomodates a full fragment
 772  * (assuming fagment size = stride-align) */
 773 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 774 {
 775         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 776         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 777
 778         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 779                             "res:%d offset:%d\n", stride, align, res, offset);
 780         return offset;
 781 }
 782
 783
 784 static int frag_sizes[] = {
 785         FRAG_SZ0,
 786         FRAG_SZ1,
 787         FRAG_SZ2,
 788         FRAG_SZ3
 789 };
 790
 791 void mlx4_en_calc_rx_buf(struct net_device *dev)
 792 {
 793         struct mlx4_en_priv *priv = netdev_priv(dev);
 794         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 795         int buf_size = 0;
 796         int i = 0;
 797
 798         while (buf_size < eff_mtu) {
 799                 priv->frag_info[i].frag_size =
 800                         (eff_mtu > buf_size + frag_sizes[i]) ?
 801                                 frag_sizes[i] : eff_mtu - buf_size;
 802                 priv->frag_info[i].frag_prefix_size = buf_size;
 803                 if (!i) {
 804                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 805                         priv->frag_info[i].frag_stride =
 806                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 807                 } else {
 808                         priv->frag_info[i].frag_align = 0;
 809                         priv->frag_info[i].frag_stride =
 810                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 811                 }
 812                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 813                                                 priv, priv->frag_info[i].frag_stride,
 814                                                 priv->frag_info[i].frag_align);
 815                 buf_size += priv->frag_info[i].frag_size;
 816                 i++;
 817         }
 818
 819         priv->num_frags = i;
 820         priv->rx_skb_size = eff_mtu;
 821         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 822
 823         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 824                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 825         for (i = 0; i < priv->num_frags; i++) {
 826                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 827                                 "stride:%d last_offset:%d\n", i,
 828                                 priv->frag_info[i].frag_size,
 829                                 priv->frag_info[i].frag_prefix_size,
 830                                 priv->frag_info[i].frag_align,
 831                                 priv->frag_info[i].frag_stride,
 832                                 priv->frag_info[i].last_offset);
 833         }
 834 }
 835
 836 /* RSS related functions */
 837
 838 /* Calculate rss size and map each entry in rss table to rx ring */
 839 void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv,
 840                                  struct mlx4_en_rss_map *rss_map,
 841                                  int num_entries, int num_rings)
 842 {
 843         int i;
 844
 845         rss_map->size = roundup_pow_of_two(num_entries);
 846         en_dbg(DRV, priv, "Setting default RSS map of %d entires\n",
 847                rss_map->size);
 848
 849         for (i = 0; i < rss_map->size; i++) {
 850                 rss_map->map[i] = i % num_rings;
 851                 en_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]);
 852         }
 853 }
 854
 855 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv,
 856                                  int qpn, int srqn, int cqn,
 857                                  enum mlx4_qp_state *state,
 858                                  struct mlx4_qp *qp)
 859 {
 860         struct mlx4_en_dev *mdev = priv->mdev;
 861         struct mlx4_qp_context *context;
 862         int err = 0;
 863
 864         context = kmalloc(sizeof *context , GFP_KERNEL);
 865         if (!context) {
 866                 en_err(priv, "Failed to allocate qp context\n");
 867                 return -ENOMEM;
 868         }
 869
 870         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 871         if (err) {
 872                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 873                 goto out;
 874         }
 875         qp->event = mlx4_en_sqp_event;
 876
 877         memset(context, 0, sizeof *context);
 878         mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context);
 879
 880         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state);
 881         if (err) {
 882                 mlx4_qp_remove(mdev->dev, qp);
 883                 mlx4_qp_free(mdev->dev, qp);
 884         }
 885 out:
 886         kfree(context);
 887         return err;
 888 }
 889
 890 /* Allocate rx qp's and configure them according to rss map */
 891 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 892 {
 893         struct mlx4_en_dev *mdev = priv->mdev;
 894         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 895         struct mlx4_qp_context context;
 896         struct mlx4_en_rss_context *rss_context;
 897         void *ptr;
 898         int rss_xor = mdev->profile.rss_xor;
 899         u8 rss_mask = mdev->profile.rss_mask;
 900         int i, srqn, qpn, cqn;
 901         int err = 0;
 902         int good_qps = 0;
 903
 904         en_dbg(DRV, priv, "Configuring rss steering\n");
 905         err = mlx4_qp_reserve_range(mdev->dev, rss_map->size,
 906                                     rss_map->size, &rss_map->base_qpn);
 907         if (err) {
 908                 en_err(priv, "Failed reserving %d qps\n", rss_map->size);
 909                 return err;
 910         }
 911
 912         for (i = 0; i < rss_map->size; i++) {
 913                 cqn = priv->rx_ring[rss_map->map[i]].cqn;
 914                 srqn = priv->rx_ring[rss_map->map[i]].srq.srqn;
 915                 qpn = rss_map->base_qpn + i;
 916                 err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn,
 917                                             &rss_map->state[i],
 918                                             &rss_map->qps[i]);
 919                 if (err)
 920                         goto rss_err;
 921
 922                 ++good_qps;
 923         }
 924
 925         /* Configure RSS indirection qp */
 926         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
 927         if (err) {
 928                 en_err(priv, "Failed to reserve range for RSS "
 929                              "indirection qp\n");
 930                 goto rss_err;
 931         }
 932         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
 933         if (err) {
 934                 en_err(priv, "Failed to allocate RSS indirection QP\n");
 935                 goto reserve_err;
 936         }
 937         rss_map->indir_qp.event = mlx4_en_sqp_event;
 938         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
 939                                 priv->rx_ring[0].cqn, 0, &context);
 940
 941         ptr = ((void *) &context) + 0x3c;
 942         rss_context = (struct mlx4_en_rss_context *) ptr;
 943         rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 |
 944                                             (rss_map->base_qpn));
 945         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
 946         rss_context->hash_fn = rss_xor & 0x3;
 947         rss_context->flags = rss_mask << 2;
 948
 949         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
 950                                &rss_map->indir_qp, &rss_map->indir_state);
 951         if (err)
 952                 goto indir_err;
 953
 954         return 0;
 955
 956 indir_err:
 957         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 958                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 959         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 960         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 961 reserve_err:
 962         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 963 rss_err:
 964         for (i = 0; i < good_qps; i++) {
 965                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 966                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 967                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 968                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 969         }
 970         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
 971         return err;
 972 }
 973
 974 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
 975 {
 976         struct mlx4_en_dev *mdev = priv->mdev;
 977         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 978         int i;
 979
 980         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
 981                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
 982         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
 983         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
 984         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
 985
 986         for (i = 0; i < rss_map->size; i++) {
 987                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
 988                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
 989                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
 990                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
 991         }
 992         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
 993 }
 994
 995
 996
 997
 998