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                 mlx4_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                 mlx4_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 int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 206 {
 207         struct mlx4_en_dev *mdev = priv->mdev;
 208         struct mlx4_en_rx_ring *ring;
 209         int ring_ind;
 210         int buf_ind;
 211
 212         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 213                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 214                         ring = &priv->rx_ring[ring_ind];
 215
 216                         if (mlx4_en_prepare_rx_desc(priv, ring,
 217                                                     ring->actual_size)) {
 218                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 219                                         mlx4_err(mdev, "Failed to allocate "
 220                                                        "enough rx buffers\n");
 221                                         return -ENOMEM;
 222                                 } else {
 223                                         if (netif_msg_rx_err(priv))
 224                                                 mlx4_warn(mdev,
 225                                                           "Only %d buffers allocated\n",
 226                                                           ring->actual_size);
 227                                         goto out;
 228                                 }
 229                         }
 230                         ring->actual_size++;
 231                         ring->prod++;
 232                 }
 233         }
 234 out:
 235         return 0;
 236 }
 237
 238 static int mlx4_en_fill_rx_buf(struct net_device *dev,
 239                                struct mlx4_en_rx_ring *ring)
 240 {
 241         struct mlx4_en_priv *priv = netdev_priv(dev);
 242         int num = 0;
 243         int err;
 244
 245         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 246                 err = mlx4_en_prepare_rx_desc(priv, ring, ring->prod &
 247                                               ring->size_mask);
 248                 if (err) {
 249                         if (netif_msg_rx_err(priv))
 250                                 mlx4_warn(priv->mdev,
 251                                           "Failed preparing rx descriptor\n");
 252                         priv->port_stats.rx_alloc_failed++;
 253                         break;
 254                 }
 255                 ++num;
 256                 ++ring->prod;
 257         }
 258         if ((u32) (ring->prod - ring->cons) == ring->size)
 259                 ring->full = 1;
 260
 261         return num;
 262 }
 263
 264 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 265                                 struct mlx4_en_rx_ring *ring)
 266 {
 267         struct mlx4_en_dev *mdev = priv->mdev;
 268         struct skb_frag_struct *skb_frags;
 269         struct mlx4_en_rx_desc *rx_desc;
 270         dma_addr_t dma;
 271         int index;
 272         int nr;
 273
 274         mlx4_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 275                         ring->cons, ring->prod);
 276
 277         /* Unmap and free Rx buffers */
 278         BUG_ON((u32) (ring->prod - ring->cons) > ring->size);
 279         while (ring->cons != ring->prod) {
 280                 index = ring->cons & ring->size_mask;
 281                 rx_desc = ring->buf + (index << ring->log_stride);
 282                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 283                 mlx4_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 284
 285                 for (nr = 0; nr < priv->num_frags; nr++) {
 286                         mlx4_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 287                         dma = be64_to_cpu(rx_desc->data[nr].addr);
 288
 289                         mlx4_dbg(DRV, priv, "Unmaping buffer at dma:0x%llx\n", (u64) dma);
 290                         pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 291                                          PCI_DMA_FROMDEVICE);
 292                         put_page(skb_frags[nr].page);
 293                 }
 294                 ++ring->cons;
 295         }
 296 }
 297
 298
 299 void mlx4_en_rx_refill(struct work_struct *work)
 300 {
 301         struct delayed_work *delay = container_of(work, struct delayed_work, work);
 302         struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
 303                                                  refill_task);
 304         struct mlx4_en_dev *mdev = priv->mdev;
 305         struct net_device *dev = priv->dev;
 306         struct mlx4_en_rx_ring *ring;
 307         int need_refill = 0;
 308         int i;
 309
 310         mutex_lock(&mdev->state_lock);
 311         if (!mdev->device_up || !priv->port_up)
 312                 goto out;
 313
 314         /* We only get here if there are no receive buffers, so we can't race
 315          * with Rx interrupts while filling buffers */
 316         for (i = 0; i < priv->rx_ring_num; i++) {
 317                 ring = &priv->rx_ring[i];
 318                 if (ring->need_refill) {
 319                         if (mlx4_en_fill_rx_buf(dev, ring)) {
 320                                 ring->need_refill = 0;
 321                                 mlx4_en_update_rx_prod_db(ring);
 322                         } else
 323                                 need_refill = 1;
 324                 }
 325         }
 326         if (need_refill)
 327                 queue_delayed_work(mdev->workqueue, &priv->refill_task, HZ);
 328
 329 out:
 330         mutex_unlock(&mdev->state_lock);
 331 }
 332
 333
 334 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 335                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 336 {
 337         struct mlx4_en_dev *mdev = priv->mdev;
 338         int err;
 339         int tmp;
 340
 341         /* Sanity check SRQ size before proceeding */
 342         if (size >= mdev->dev->caps.max_srq_wqes)
 343                 return -EINVAL;
 344
 345         ring->prod = 0;
 346         ring->cons = 0;
 347         ring->size = size;
 348         ring->size_mask = size - 1;
 349         ring->stride = stride;
 350         ring->log_stride = ffs(ring->stride) - 1;
 351         ring->buf_size = ring->size * ring->stride;
 352
 353         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 354                                         sizeof(struct skb_frag_struct));
 355         ring->rx_info = vmalloc(tmp);
 356         if (!ring->rx_info) {
 357                 mlx4_err(mdev, "Failed allocating rx_info ring\n");
 358                 return -ENOMEM;
 359         }
 360         mlx4_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 361                  ring->rx_info, tmp);
 362
 363         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 364                                  ring->buf_size, 2 * PAGE_SIZE);
 365         if (err)
 366                 goto err_ring;
 367
 368         err = mlx4_en_map_buffer(&ring->wqres.buf);
 369         if (err) {
 370                 mlx4_err(mdev, "Failed to map RX buffer\n");
 371                 goto err_hwq;
 372         }
 373         ring->buf = ring->wqres.buf.direct.buf;
 374
 375         /* Configure lro mngr */
 376         memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
 377         ring->lro.dev = priv->dev;
 378         ring->lro.features = LRO_F_NAPI;
 379         ring->lro.frag_align_pad = NET_IP_ALIGN;
 380         ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
 381         ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 382         ring->lro.max_desc = mdev->profile.num_lro;
 383         ring->lro.max_aggr = MAX_SKB_FRAGS;
 384         ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
 385                                     sizeof(struct net_lro_desc),
 386                                     GFP_KERNEL);
 387         if (!ring->lro.lro_arr) {
 388                 mlx4_err(mdev, "Failed to allocate lro array\n");
 389                 goto err_map;
 390         }
 391         ring->lro.get_frag_header = mlx4_en_get_frag_header;
 392
 393         return 0;
 394
 395 err_map:
 396         mlx4_en_unmap_buffer(&ring->wqres.buf);
 397 err_hwq:
 398         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 399 err_ring:
 400         vfree(ring->rx_info);
 401         ring->rx_info = NULL;
 402         return err;
 403 }
 404
 405 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 406 {
 407         struct mlx4_en_dev *mdev = priv->mdev;
 408         struct mlx4_wqe_srq_next_seg *next;
 409         struct mlx4_en_rx_ring *ring;
 410         int i;
 411         int ring_ind;
 412         int err;
 413         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 414                                         DS_SIZE * priv->num_frags);
 415         int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE;
 416
 417         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 418                 ring = &priv->rx_ring[ring_ind];
 419
 420                 ring->prod = 0;
 421                 ring->cons = 0;
 422                 ring->actual_size = 0;
 423                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 424
 425                 ring->stride = stride;
 426                 ring->log_stride = ffs(ring->stride) - 1;
 427                 ring->buf_size = ring->size * ring->stride;
 428
 429                 memset(ring->buf, 0, ring->buf_size);
 430                 mlx4_en_update_rx_prod_db(ring);
 431
 432                 /* Initailize all descriptors */
 433                 for (i = 0; i < ring->size; i++)
 434                         mlx4_en_init_rx_desc(priv, ring, i);
 435
 436                 /* Initialize page allocators */
 437                 err = mlx4_en_init_allocator(priv, ring);
 438                 if (err) {
 439                          mlx4_err(mdev, "Failed initializing ring allocator\n");
 440                          goto err_allocator;
 441                 }
 442
 443                 /* Fill Rx buffers */
 444                 ring->full = 0;
 445         }
 446         if (mlx4_en_fill_rx_buffers(priv))
 447                 goto err_buffers;
 448
 449         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 450                 ring = &priv->rx_ring[ring_ind];
 451
 452                 mlx4_en_update_rx_prod_db(ring);
 453
 454                 /* Configure SRQ representing the ring */
 455                 ring->srq.max    = ring->size;
 456                 ring->srq.max_gs = max_gs;
 457                 ring->srq.wqe_shift = ilog2(ring->stride);
 458
 459                 for (i = 0; i < ring->srq.max; ++i) {
 460                         next = get_wqe(ring, i);
 461                         next->next_wqe_index =
 462                         cpu_to_be16((i + 1) & (ring->srq.max - 1));
 463                 }
 464
 465                 err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt,
 466                                      ring->wqres.db.dma, &ring->srq);
 467                 if (err){
 468                         mlx4_err(mdev, "Failed to allocate srq\n");
 469                         goto err_srq;
 470                 }
 471                 ring->srq.event = mlx4_en_srq_event;
 472         }
 473
 474         return 0;
 475
 476 err_srq:
 477         while (ring_ind >= 0) {
 478                 ring = &priv->rx_ring[ring_ind];
 479                 mlx4_srq_free(mdev->dev, &ring->srq);
 480                 ring_ind--;
 481         }
 482
 483 err_buffers:
 484         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 485                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 486
 487         ring_ind = priv->rx_ring_num - 1;
 488 err_allocator:
 489         while (ring_ind >= 0) {
 490                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 491                 ring_ind--;
 492         }
 493         return err;
 494 }
 495
 496 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 497                              struct mlx4_en_rx_ring *ring)
 498 {
 499         struct mlx4_en_dev *mdev = priv->mdev;
 500
 501         kfree(ring->lro.lro_arr);
 502         mlx4_en_unmap_buffer(&ring->wqres.buf);
 503         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 504         vfree(ring->rx_info);
 505         ring->rx_info = NULL;
 506 }
 507
 508 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 509                                 struct mlx4_en_rx_ring *ring)
 510 {
 511         struct mlx4_en_dev *mdev = priv->mdev;
 512
 513         mlx4_srq_free(mdev->dev, &ring->srq);
 514         mlx4_en_free_rx_buf(priv, ring);
 515         mlx4_en_destroy_allocator(priv, ring);
 516 }
 517
 518
 519 /* Unmap a completed descriptor and free unused pages */
 520 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 521                                     struct mlx4_en_rx_desc *rx_desc,
 522                                     struct skb_frag_struct *skb_frags,
 523                                     struct skb_frag_struct *skb_frags_rx,
 524                                     struct mlx4_en_rx_alloc *page_alloc,
 525                                     int length)
 526 {
 527         struct mlx4_en_dev *mdev = priv->mdev;
 528         struct mlx4_en_frag_info *frag_info;
 529         int nr;
 530         dma_addr_t dma;
 531
 532         /* Collect used fragments while replacing them in the HW descirptors */
 533         for (nr = 0; nr < priv->num_frags; nr++) {
 534                 frag_info = &priv->frag_info[nr];
 535                 if (length <= frag_info->frag_prefix_size)
 536                         break;
 537
 538                 /* Save page reference in skb */
 539                 skb_frags_rx[nr].page = skb_frags[nr].page;
 540                 skb_frags_rx[nr].size = skb_frags[nr].size;
 541                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 542                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 543
 544                 /* Allocate a replacement page */
 545                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 546                         goto fail;
 547
 548                 /* Unmap buffer */
 549                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 550                                  PCI_DMA_FROMDEVICE);
 551         }
 552         /* Adjust size of last fragment to match actual length */
 553         skb_frags_rx[nr - 1].size = length -
 554                 priv->frag_info[nr - 1].frag_prefix_size;
 555         return nr;
 556
 557 fail:
 558         /* Drop all accumulated fragments (which have already been replaced in
 559          * the descriptor) of this packet; remaining fragments are reused... */
 560         while (nr > 0) {
 561                 nr--;
 562                 put_page(skb_frags_rx[nr].page);
 563         }
 564         return 0;
 565 }
 566
 567
 568 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 569                                       struct mlx4_en_rx_desc *rx_desc,
 570                                       struct skb_frag_struct *skb_frags,
 571                                       struct mlx4_en_rx_alloc *page_alloc,
 572                                       unsigned int length)
 573 {
 574         struct mlx4_en_dev *mdev = priv->mdev;
 575         struct sk_buff *skb;
 576         void *va;
 577         int used_frags;
 578         dma_addr_t dma;
 579
 580         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 581         if (!skb) {
 582                 mlx4_dbg(RX_ERR, priv, "Failed allocating skb\n");
 583                 return NULL;
 584         }
 585         skb->dev = priv->dev;
 586         skb_reserve(skb, NET_IP_ALIGN);
 587         skb->len = length;
 588         skb->truesize = length + sizeof(struct sk_buff);
 589
 590         /* Get pointer to first fragment so we could copy the headers into the
 591          * (linear part of the) skb */
 592         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 593
 594         if (length <= SMALL_PACKET_SIZE) {
 595                 /* We are copying all relevant data to the skb - temporarily
 596                  * synch buffers for the copy */
 597                 dma = be64_to_cpu(rx_desc->data[0].addr);
 598                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 599                                               length, DMA_FROM_DEVICE);
 600                 skb_copy_to_linear_data(skb, va, length);
 601                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 602                                                  length, DMA_FROM_DEVICE);
 603                 skb->tail += length;
 604         } else {
 605
 606                 /* Move relevant fragments to skb */
 607                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 608                                                       skb_shinfo(skb)->frags,
 609                                                       page_alloc, length);
 610                 skb_shinfo(skb)->nr_frags = used_frags;
 611
 612                 /* Copy headers into the skb linear buffer */
 613                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 614                 skb->tail += HEADER_COPY_SIZE;
 615
 616                 /* Skip headers in first fragment */
 617                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 618
 619                 /* Adjust size of first fragment */
 620                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 621                 skb->data_len = length - HEADER_COPY_SIZE;
 622         }
 623         return skb;
 624 }
 625
 626 static void mlx4_en_copy_desc(struct mlx4_en_priv *priv,
 627                               struct mlx4_en_rx_ring *ring,
 628                               int from, int to, int num)
 629 {
 630         struct skb_frag_struct *skb_frags_from;
 631         struct skb_frag_struct *skb_frags_to;
 632         struct mlx4_en_rx_desc *rx_desc_from;
 633         struct mlx4_en_rx_desc *rx_desc_to;
 634         int from_index, to_index;
 635         int nr, i;
 636
 637         for (i = 0; i < num; i++) {
 638                 from_index = (from + i) & ring->size_mask;
 639                 to_index = (to + i) & ring->size_mask;
 640                 skb_frags_from = ring->rx_info + (from_index << priv->log_rx_info);
 641                 skb_frags_to = ring->rx_info + (to_index << priv->log_rx_info);
 642                 rx_desc_from = ring->buf + (from_index << ring->log_stride);
 643                 rx_desc_to = ring->buf + (to_index << ring->log_stride);
 644
 645                 for (nr = 0; nr < priv->num_frags; nr++) {
 646                         skb_frags_to[nr].page = skb_frags_from[nr].page;
 647                         skb_frags_to[nr].page_offset = skb_frags_from[nr].page_offset;
 648                         rx_desc_to->data[nr].addr = rx_desc_from->data[nr].addr;
 649                 }
 650         }
 651 }
 652
 653
 654 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 655 {
 656         struct mlx4_en_priv *priv = netdev_priv(dev);
 657         struct mlx4_en_dev *mdev = priv->mdev;
 658         struct mlx4_cqe *cqe;
 659         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 660         struct skb_frag_struct *skb_frags;
 661         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 662         struct mlx4_en_rx_desc *rx_desc;
 663         struct sk_buff *skb;
 664         int index;
 665         int nr;
 666         unsigned int length;
 667         int polled = 0;
 668         int ip_summed;
 669
 670         if (!priv->port_up)
 671                 return 0;
 672
 673         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 674          * descriptor offset can be deduced from the CQE index instead of
 675          * reading 'cqe->index' */
 676         index = cq->mcq.cons_index & ring->size_mask;
 677         cqe = &cq->buf[index];
 678
 679         /* Process all completed CQEs */
 680         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 681                     cq->mcq.cons_index & cq->size)) {
 682
 683                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 684                 rx_desc = ring->buf + (index << ring->log_stride);
 685
 686                 /*
 687                  * make sure we read the CQE after we read the ownership bit
 688                  */
 689                 rmb();
 690
 691                 /* Drop packet on bad receive or bad checksum */
 692                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 693                                                 MLX4_CQE_OPCODE_ERROR)) {
 694                         mlx4_err(mdev, "CQE completed in error - vendor "
 695                                   "syndrom:%d syndrom:%d\n",
 696                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 697                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 698                         goto next;
 699                 }
 700                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 701                         mlx4_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 702                         goto next;
 703                 }
 704
 705                 /*
 706                  * Packet is OK - process it.
 707                  */
 708                 length = be32_to_cpu(cqe->byte_cnt);
 709                 ring->bytes += length;
 710                 ring->packets++;
 711
 712                 if (likely(priv->rx_csum)) {
 713                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 714                             (cqe->checksum == cpu_to_be16(0xffff))) {
 715                                 priv->port_stats.rx_chksum_good++;
 716                                 /* This packet is eligible for LRO if it is:
 717                                  * - DIX Ethernet (type interpretation)
 718                                  * - TCP/IP (v4)
 719                                  * - without IP options
 720                                  * - not an IP fragment */
 721                                 if (mlx4_en_can_lro(cqe->status) &&
 722                                     dev->features & NETIF_F_LRO) {
 723
 724                                         nr = mlx4_en_complete_rx_desc(
 725                                                 priv, rx_desc,
 726                                                 skb_frags, lro_frags,
 727                                                 ring->page_alloc, length);
 728                                         if (!nr)
 729                                                 goto next;
 730
 731                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 732                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 733                                                 lro_vlan_hwaccel_receive_frags(
 734                                                        &ring->lro, lro_frags,
 735                                                        length, length,
 736                                                        priv->vlgrp,
 737                                                        be16_to_cpu(cqe->sl_vid),
 738                                                        NULL, 0);
 739                                         } else
 740                                                 lro_receive_frags(&ring->lro,
 741                                                                   lro_frags,
 742                                                                   length,
 743                                                                   length,
 744                                                                   NULL, 0);
 745
 746                                         goto next;
 747                                 }
 748
 749                                 /* LRO not possible, complete processing here */
 750                                 ip_summed = CHECKSUM_UNNECESSARY;
 751                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 752                         } else {
 753                                 ip_summed = CHECKSUM_NONE;
 754                                 priv->port_stats.rx_chksum_none++;
 755                         }
 756                 } else {
 757                         ip_summed = CHECKSUM_NONE;
 758                         priv->port_stats.rx_chksum_none++;
 759                 }
 760
 761                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 762                                      ring->page_alloc, length);
 763                 if (!skb) {
 764                         priv->stats.rx_dropped++;
 765                         goto next;
 766                 }
 767
 768                 skb->ip_summed = ip_summed;
 769                 skb->protocol = eth_type_trans(skb, dev);
 770
 771                 /* Push it up the stack */
 772                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 773                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 774                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 775                                                 be16_to_cpu(cqe->sl_vid));
 776                 } else
 777                         netif_receive_skb(skb);
 778
 779                 dev->last_rx = jiffies;
 780
 781 next:
 782                 ++cq->mcq.cons_index;
 783                 index = (cq->mcq.cons_index) & ring->size_mask;
 784                 cqe = &cq->buf[index];
 785                 if (++polled == budget) {
 786                         /* We are here because we reached the NAPI budget -
 787                          * flush only pending LRO sessions */
 788                         lro_flush_all(&ring->lro);
 789                         goto out;
 790                 }
 791         }
 792
 793         /* If CQ is empty flush all LRO sessions unconditionally */
 794         lro_flush_all(&ring->lro);
 795
 796 out:
 797         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 798         mlx4_cq_set_ci(&cq->mcq);
 799         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 800         ring->cons = cq->mcq.cons_index;
 801         ring->prod += polled; /* Polled descriptors were realocated in place */
 802         if (unlikely(!ring->full)) {
 803                 mlx4_en_copy_desc(priv, ring, ring->cons - polled,
 804                                   ring->prod - polled, polled);
 805                 mlx4_en_fill_rx_buf(dev, ring);
 806         }
 807         mlx4_en_update_rx_prod_db(ring);
 808         return polled;
 809 }
 810
 811
 812 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 813 {
 814         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 815         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 816
 817         if (priv->port_up)
 818                 netif_rx_schedule(cq->dev, &cq->napi);
 819         else
 820                 mlx4_en_arm_cq(priv, cq);
 821 }
 822
 823 /* Rx CQ polling - called by NAPI */
 824 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 825 {
 826         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 827         struct net_device *dev = cq->dev;
 828         struct mlx4_en_priv *priv = netdev_priv(dev);
 829         int done;
 830
 831         done = mlx4_en_process_rx_cq(dev, cq, budget);
 832
 833         /* If we used up all the quota - we're probably not done yet... */
 834         if (done == budget)
 835                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 836         else {
 837                 /* Done for now */
 838                 netif_rx_complete(dev, napi);
 839                 mlx4_en_arm_cq(priv, cq);
 840         }
 841         return done;
 842 }
 843
 844
 845 /* Calculate the last offset position that accomodates a full fragment
 846  * (assuming fagment size = stride-align) */
 847 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 848 {
 849         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 850         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 851
 852         mlx4_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 853                             "res:%d offset:%d\n", stride, align, res, offset);
 854         return offset;
 855 }
 856
 857
 858 static int frag_sizes[] = {
 859         FRAG_SZ0,
 860         FRAG_SZ1,
 861         FRAG_SZ2,
 862         FRAG_SZ3
 863 };
 864
 865 void mlx4_en_calc_rx_buf(struct net_device *dev)
 866 {
 867         struct mlx4_en_priv *priv = netdev_priv(dev);
 868         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 869         int buf_size = 0;
 870         int i = 0;
 871
 872         while (buf_size < eff_mtu) {
 873                 priv->frag_info[i].frag_size =
 874                         (eff_mtu > buf_size + frag_sizes[i]) ?
 875                                 frag_sizes[i] : eff_mtu - buf_size;
 876                 priv->frag_info[i].frag_prefix_size = buf_size;
 877                 if (!i) {
 878                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 879                         priv->frag_info[i].frag_stride =
 880                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 881                 } else {
 882                         priv->frag_info[i].frag_align = 0;
 883                         priv->frag_info[i].frag_stride =
 884                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 885                 }
 886                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 887                                                 priv, priv->frag_info[i].frag_stride,
 888                                                 priv->frag_info[i].frag_align);
 889                 buf_size += priv->frag_info[i].frag_size;
 890                 i++;
 891         }
 892
 893         priv->num_frags = i;
 894         priv->rx_skb_size = eff_mtu;
 895         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 896
 897         mlx4_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 898                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 899         for (i = 0; i < priv->num_frags; i++) {
 900                 mlx4_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 901                                 "stride:%d last_offset:%d\n", i,
 902                                 priv->frag_info[i].frag_size,
 903                                 priv->frag_info[i].frag_prefix_size,
 904                                 priv->frag_info[i].frag_align,
 905                                 priv->frag_info[i].frag_stride,
 906                                 priv->frag_info[i].last_offset);
 907         }
 908 }
 909
 910 /* RSS related functions */
 911
 912 /* Calculate rss size and map each entry in rss table to rx ring */
 913 void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv,
 914                                  struct mlx4_en_rss_map *rss_map,
 915                                  int num_entries, int num_rings)
 916 {
 917         int i;
 918
 919         rss_map->size = roundup_pow_of_two(num_entries);
 920         mlx4_dbg(DRV, priv, "Setting default RSS map of %d entires\n",
 921                  rss_map->size);
 922
 923         for (i = 0; i < rss_map->size; i++) {
 924                 rss_map->map[i] = i % num_rings;
 925                 mlx4_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]);
 926         }
 927 }
 928
 929 static void mlx4_en_sqp_event(struct mlx4_qp *qp, enum mlx4_event event)
 930 {
 931     return;
 932 }
 933
 934
 935 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv,
 936                                  int qpn, int srqn, int cqn,
 937                                  enum mlx4_qp_state *state,
 938                                  struct mlx4_qp *qp)
 939 {
 940         struct mlx4_en_dev *mdev = priv->mdev;
 941         struct mlx4_qp_context *context;
 942         int err = 0;
 943
 944         context = kmalloc(sizeof *context , GFP_KERNEL);
 945         if (!context) {
 946                 mlx4_err(mdev, "Failed to allocate qp context\n");
 947                 return -ENOMEM;
 948         }
 949
 950         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 951         if (err) {
 952                 mlx4_err(mdev, "Failed to allocate qp #%d\n", qpn);
 953                 goto out;
 954                 return err;
 955         }
 956         qp->event = mlx4_en_sqp_event;
 957
 958         memset(context, 0, sizeof *context);
 959         mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context);
 960
 961         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state);
 962         if (err) {
 963                 mlx4_qp_remove(mdev->dev, qp);
 964                 mlx4_qp_free(mdev->dev, qp);
 965         }
 966 out:
 967         kfree(context);
 968         return err;
 969 }
 970
 971 /* Allocate rx qp's and configure them according to rss map */
 972 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 973 {
 974         struct mlx4_en_dev *mdev = priv->mdev;
 975         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 976         struct mlx4_qp_context context;
 977         struct mlx4_en_rss_context *rss_context;
 978         void *ptr;
 979         int rss_xor = mdev->profile.rss_xor;
 980         u8 rss_mask = mdev->profile.rss_mask;
 981         int i, srqn, qpn, cqn;
 982         int err = 0;
 983         int good_qps = 0;
 984
 985         mlx4_dbg(DRV, priv, "Configuring rss steering for port %u\n", priv->port);
 986         err = mlx4_qp_reserve_range(mdev->dev, rss_map->size,
 987                                     rss_map->size, &rss_map->base_qpn);
 988         if (err) {
 989                 mlx4_err(mdev, "Failed reserving %d qps for port %u\n",
 990                          rss_map->size, priv->port);
 991                 return err;
 992         }
 993
 994         for (i = 0; i < rss_map->size; i++) {
 995                 cqn = priv->rx_ring[rss_map->map[i]].cqn;
 996                 srqn = priv->rx_ring[rss_map->map[i]].srq.srqn;
 997                 qpn = rss_map->base_qpn + i;
 998                 err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn,
 999                                             &rss_map->state[i],
1000                                             &rss_map->qps[i]);
1001                 if (err)
1002                         goto rss_err;
1003
1004                 ++good_qps;
1005         }
1006
1007         /* Configure RSS indirection qp */
1008         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
1009         if (err) {
1010                 mlx4_err(mdev, "Failed to reserve range for RSS "
1011                                "indirection qp\n");
1012                 goto rss_err;
1013         }
1014         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
1015         if (err) {
1016                 mlx4_err(mdev, "Failed to allocate RSS indirection QP\n");
1017                 goto reserve_err;
1018         }
1019         rss_map->indir_qp.event = mlx4_en_sqp_event;
1020         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1021                                 priv->rx_ring[0].cqn, 0, &context);
1022
1023         ptr = ((void *) &context) + 0x3c;
1024         rss_context = (struct mlx4_en_rss_context *) ptr;
1025         rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 |
1026                                             (rss_map->base_qpn));
1027         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1028         rss_context->hash_fn = rss_xor & 0x3;
1029         rss_context->flags = rss_mask << 2;
1030
1031         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1032                                &rss_map->indir_qp, &rss_map->indir_state);
1033         if (err)
1034                 goto indir_err;
1035
1036         return 0;
1037
1038 indir_err:
1039         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1040                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1041         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1042         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1043 reserve_err:
1044         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1045 rss_err:
1046         for (i = 0; i < good_qps; i++) {
1047                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1048                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1049                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1050                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1051         }
1052         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1053         return err;
1054 }
1055
1056 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1057 {
1058         struct mlx4_en_dev *mdev = priv->mdev;
1059         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1060         int i;
1061
1062         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1063                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1064         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1065         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1066         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1067
1068         for (i = 0; i < rss_map->size; i++) {
1069                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1070                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1071                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1072                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1073         }
1074         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1075 }
1076
1077
1078
1079
1080