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 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 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                 mlx4_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 218                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 219
 220                 mlx4_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_dev *mdev = priv->mdev;
 230         struct mlx4_en_rx_ring *ring;
 231         int ring_ind;
 232         int buf_ind;
 233         int new_size;
 234
 235         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 236                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 237                         ring = &priv->rx_ring[ring_ind];
 238
 239                         if (mlx4_en_prepare_rx_desc(priv, ring,
 240                                                     ring->actual_size)) {
 241                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 242                                         mlx4_err(mdev, "Failed to allocate "
 243                                                        "enough rx buffers\n");
 244                                         return -ENOMEM;
 245                                 } else {
 246                                         new_size = rounddown_pow_of_two(ring->actual_size);
 247                                         mlx4_warn(mdev, "Only %d buffers allocated "
 248                                                         "reducing ring size to %d",
 249                                                   ring->actual_size, new_size);
 250                                         goto reduce_rings;
 251                                 }
 252                         }
 253                         ring->actual_size++;
 254                         ring->prod++;
 255                 }
 256         }
 257         return 0;
 258
 259 reduce_rings:
 260         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 261                 ring = &priv->rx_ring[ring_ind];
 262                 while (ring->actual_size > new_size) {
 263                         ring->actual_size--;
 264                         ring->prod--;
 265                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 266                 }
 267                 ring->size_mask = ring->actual_size - 1;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int mlx4_en_fill_rx_buf(struct net_device *dev,
 274                                struct mlx4_en_rx_ring *ring)
 275 {
 276         struct mlx4_en_priv *priv = netdev_priv(dev);
 277         int num = 0;
 278         int err;
 279
 280         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 281                 err = mlx4_en_prepare_rx_desc(priv, ring, ring->prod &
 282                                               ring->size_mask);
 283                 if (err) {
 284                         if (netif_msg_rx_err(priv))
 285                                 mlx4_warn(priv->mdev,
 286                                           "Failed preparing rx descriptor\n");
 287                         priv->port_stats.rx_alloc_failed++;
 288                         break;
 289                 }
 290                 ++num;
 291                 ++ring->prod;
 292         }
 293         if ((u32) (ring->prod - ring->cons) == ring->actual_size)
 294                 ring->full = 1;
 295
 296         return num;
 297 }
 298
 299 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 300                                 struct mlx4_en_rx_ring *ring)
 301 {
 302         int index;
 303
 304         mlx4_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 305                         ring->cons, ring->prod);
 306
 307         /* Unmap and free Rx buffers */
 308         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 309         while (ring->cons != ring->prod) {
 310                 index = ring->cons & ring->size_mask;
 311                 mlx4_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 312                 mlx4_en_free_rx_desc(priv, ring, index);
 313                 ++ring->cons;
 314         }
 315 }
 316
 317
 318 void mlx4_en_rx_refill(struct work_struct *work)
 319 {
 320         struct delayed_work *delay = to_delayed_work(work);
 321         struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
 322                                                  refill_task);
 323         struct mlx4_en_dev *mdev = priv->mdev;
 324         struct net_device *dev = priv->dev;
 325         struct mlx4_en_rx_ring *ring;
 326         int need_refill = 0;
 327         int i;
 328
 329         mutex_lock(&mdev->state_lock);
 330         if (!mdev->device_up || !priv->port_up)
 331                 goto out;
 332
 333         /* We only get here if there are no receive buffers, so we can't race
 334          * with Rx interrupts while filling buffers */
 335         for (i = 0; i < priv->rx_ring_num; i++) {
 336                 ring = &priv->rx_ring[i];
 337                 if (ring->need_refill) {
 338                         if (mlx4_en_fill_rx_buf(dev, ring)) {
 339                                 ring->need_refill = 0;
 340                                 mlx4_en_update_rx_prod_db(ring);
 341                         } else
 342                                 need_refill = 1;
 343                 }
 344         }
 345         if (need_refill)
 346                 queue_delayed_work(mdev->workqueue, &priv->refill_task, HZ);
 347
 348 out:
 349         mutex_unlock(&mdev->state_lock);
 350 }
 351
 352
 353 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 354                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 355 {
 356         struct mlx4_en_dev *mdev = priv->mdev;
 357         int err;
 358         int tmp;
 359
 360         /* Sanity check SRQ size before proceeding */
 361         if (size >= mdev->dev->caps.max_srq_wqes)
 362                 return -EINVAL;
 363
 364         ring->prod = 0;
 365         ring->cons = 0;
 366         ring->size = size;
 367         ring->size_mask = size - 1;
 368         ring->stride = stride;
 369         ring->log_stride = ffs(ring->stride) - 1;
 370         ring->buf_size = ring->size * ring->stride;
 371
 372         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 373                                         sizeof(struct skb_frag_struct));
 374         ring->rx_info = vmalloc(tmp);
 375         if (!ring->rx_info) {
 376                 mlx4_err(mdev, "Failed allocating rx_info ring\n");
 377                 return -ENOMEM;
 378         }
 379         mlx4_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 380                  ring->rx_info, tmp);
 381
 382         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 383                                  ring->buf_size, 2 * PAGE_SIZE);
 384         if (err)
 385                 goto err_ring;
 386
 387         err = mlx4_en_map_buffer(&ring->wqres.buf);
 388         if (err) {
 389                 mlx4_err(mdev, "Failed to map RX buffer\n");
 390                 goto err_hwq;
 391         }
 392         ring->buf = ring->wqres.buf.direct.buf;
 393
 394         /* Configure lro mngr */
 395         memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
 396         ring->lro.dev = priv->dev;
 397         ring->lro.features = LRO_F_NAPI;
 398         ring->lro.frag_align_pad = NET_IP_ALIGN;
 399         ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
 400         ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 401         ring->lro.max_desc = mdev->profile.num_lro;
 402         ring->lro.max_aggr = MAX_SKB_FRAGS;
 403         ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
 404                                     sizeof(struct net_lro_desc),
 405                                     GFP_KERNEL);
 406         if (!ring->lro.lro_arr) {
 407                 mlx4_err(mdev, "Failed to allocate lro array\n");
 408                 goto err_map;
 409         }
 410         ring->lro.get_frag_header = mlx4_en_get_frag_header;
 411
 412         return 0;
 413
 414 err_map:
 415         mlx4_en_unmap_buffer(&ring->wqres.buf);
 416 err_hwq:
 417         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 418 err_ring:
 419         vfree(ring->rx_info);
 420         ring->rx_info = NULL;
 421         return err;
 422 }
 423
 424 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 425 {
 426         struct mlx4_en_dev *mdev = priv->mdev;
 427         struct mlx4_wqe_srq_next_seg *next;
 428         struct mlx4_en_rx_ring *ring;
 429         int i;
 430         int ring_ind;
 431         int err;
 432         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 433                                         DS_SIZE * priv->num_frags);
 434         int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE;
 435
 436         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 437                 ring = &priv->rx_ring[ring_ind];
 438
 439                 ring->prod = 0;
 440                 ring->cons = 0;
 441                 ring->actual_size = 0;
 442                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 443
 444                 ring->stride = stride;
 445                 ring->log_stride = ffs(ring->stride) - 1;
 446                 ring->buf_size = ring->size * ring->stride;
 447
 448                 memset(ring->buf, 0, ring->buf_size);
 449                 mlx4_en_update_rx_prod_db(ring);
 450
 451                 /* Initailize all descriptors */
 452                 for (i = 0; i < ring->size; i++)
 453                         mlx4_en_init_rx_desc(priv, ring, i);
 454
 455                 /* Initialize page allocators */
 456                 err = mlx4_en_init_allocator(priv, ring);
 457                 if (err) {
 458                         mlx4_err(mdev, "Failed initializing ring allocator\n");
 459                         ring_ind--;
 460                         goto err_allocator;
 461                 }
 462
 463                 /* Fill Rx buffers */
 464                 ring->full = 0;
 465         }
 466         err = mlx4_en_fill_rx_buffers(priv);
 467         if (err)
 468                 goto err_buffers;
 469
 470         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 471                 ring = &priv->rx_ring[ring_ind];
 472
 473                 mlx4_en_update_rx_prod_db(ring);
 474
 475                 /* Configure SRQ representing the ring */
 476                 ring->srq.max    = ring->actual_size;
 477                 ring->srq.max_gs = max_gs;
 478                 ring->srq.wqe_shift = ilog2(ring->stride);
 479
 480                 for (i = 0; i < ring->srq.max; ++i) {
 481                         next = get_wqe(ring, i);
 482                         next->next_wqe_index =
 483                         cpu_to_be16((i + 1) & (ring->srq.max - 1));
 484                 }
 485
 486                 err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt,
 487                                      ring->wqres.db.dma, &ring->srq);
 488                 if (err){
 489                         mlx4_err(mdev, "Failed to allocate srq\n");
 490                         ring_ind--;
 491                         goto err_srq;
 492                 }
 493                 ring->srq.event = mlx4_en_srq_event;
 494         }
 495
 496         return 0;
 497
 498 err_srq:
 499         while (ring_ind >= 0) {
 500                 ring = &priv->rx_ring[ring_ind];
 501                 mlx4_srq_free(mdev->dev, &ring->srq);
 502                 ring_ind--;
 503         }
 504
 505 err_buffers:
 506         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 507                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 508
 509         ring_ind = priv->rx_ring_num - 1;
 510 err_allocator:
 511         while (ring_ind >= 0) {
 512                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 513                 ring_ind--;
 514         }
 515         return err;
 516 }
 517
 518 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 519                              struct mlx4_en_rx_ring *ring)
 520 {
 521         struct mlx4_en_dev *mdev = priv->mdev;
 522
 523         kfree(ring->lro.lro_arr);
 524         mlx4_en_unmap_buffer(&ring->wqres.buf);
 525         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 526         vfree(ring->rx_info);
 527         ring->rx_info = NULL;
 528 }
 529
 530 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 531                                 struct mlx4_en_rx_ring *ring)
 532 {
 533         struct mlx4_en_dev *mdev = priv->mdev;
 534
 535         mlx4_srq_free(mdev->dev, &ring->srq);
 536         mlx4_en_free_rx_buf(priv, ring);
 537         mlx4_en_destroy_allocator(priv, ring);
 538 }
 539
 540
 541 /* Unmap a completed descriptor and free unused pages */
 542 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 543                                     struct mlx4_en_rx_desc *rx_desc,
 544                                     struct skb_frag_struct *skb_frags,
 545                                     struct skb_frag_struct *skb_frags_rx,
 546                                     struct mlx4_en_rx_alloc *page_alloc,
 547                                     int length)
 548 {
 549         struct mlx4_en_dev *mdev = priv->mdev;
 550         struct mlx4_en_frag_info *frag_info;
 551         int nr;
 552         dma_addr_t dma;
 553
 554         /* Collect used fragments while replacing them in the HW descirptors */
 555         for (nr = 0; nr < priv->num_frags; nr++) {
 556                 frag_info = &priv->frag_info[nr];
 557                 if (length <= frag_info->frag_prefix_size)
 558                         break;
 559
 560                 /* Save page reference in skb */
 561                 skb_frags_rx[nr].page = skb_frags[nr].page;
 562                 skb_frags_rx[nr].size = skb_frags[nr].size;
 563                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 564                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 565
 566                 /* Allocate a replacement page */
 567                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 568                         goto fail;
 569
 570                 /* Unmap buffer */
 571                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 572                                  PCI_DMA_FROMDEVICE);
 573         }
 574         /* Adjust size of last fragment to match actual length */
 575         skb_frags_rx[nr - 1].size = length -
 576                 priv->frag_info[nr - 1].frag_prefix_size;
 577         return nr;
 578
 579 fail:
 580         /* Drop all accumulated fragments (which have already been replaced in
 581          * the descriptor) of this packet; remaining fragments are reused... */
 582         while (nr > 0) {
 583                 nr--;
 584                 put_page(skb_frags_rx[nr].page);
 585         }
 586         return 0;
 587 }
 588
 589
 590 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 591                                       struct mlx4_en_rx_desc *rx_desc,
 592                                       struct skb_frag_struct *skb_frags,
 593                                       struct mlx4_en_rx_alloc *page_alloc,
 594                                       unsigned int length)
 595 {
 596         struct mlx4_en_dev *mdev = priv->mdev;
 597         struct sk_buff *skb;
 598         void *va;
 599         int used_frags;
 600         dma_addr_t dma;
 601
 602         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 603         if (!skb) {
 604                 mlx4_dbg(RX_ERR, priv, "Failed allocating skb\n");
 605                 return NULL;
 606         }
 607         skb->dev = priv->dev;
 608         skb_reserve(skb, NET_IP_ALIGN);
 609         skb->len = length;
 610         skb->truesize = length + sizeof(struct sk_buff);
 611
 612         /* Get pointer to first fragment so we could copy the headers into the
 613          * (linear part of the) skb */
 614         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 615
 616         if (length <= SMALL_PACKET_SIZE) {
 617                 /* We are copying all relevant data to the skb - temporarily
 618                  * synch buffers for the copy */
 619                 dma = be64_to_cpu(rx_desc->data[0].addr);
 620                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 621                                               length, DMA_FROM_DEVICE);
 622                 skb_copy_to_linear_data(skb, va, length);
 623                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 624                                                  length, DMA_FROM_DEVICE);
 625                 skb->tail += length;
 626         } else {
 627
 628                 /* Move relevant fragments to skb */
 629                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 630                                                       skb_shinfo(skb)->frags,
 631                                                       page_alloc, length);
 632                 if (unlikely(!used_frags)) {
 633                         kfree_skb(skb);
 634                         return NULL;
 635                 }
 636                 skb_shinfo(skb)->nr_frags = used_frags;
 637
 638                 /* Copy headers into the skb linear buffer */
 639                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 640                 skb->tail += HEADER_COPY_SIZE;
 641
 642                 /* Skip headers in first fragment */
 643                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 644
 645                 /* Adjust size of first fragment */
 646                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 647                 skb->data_len = length - HEADER_COPY_SIZE;
 648         }
 649         return skb;
 650 }
 651
 652 static void mlx4_en_copy_desc(struct mlx4_en_priv *priv,
 653                               struct mlx4_en_rx_ring *ring,
 654                               int from, int to, int num)
 655 {
 656         struct skb_frag_struct *skb_frags_from;
 657         struct skb_frag_struct *skb_frags_to;
 658         struct mlx4_en_rx_desc *rx_desc_from;
 659         struct mlx4_en_rx_desc *rx_desc_to;
 660         int from_index, to_index;
 661         int nr, i;
 662
 663         for (i = 0; i < num; i++) {
 664                 from_index = (from + i) & ring->size_mask;
 665                 to_index = (to + i) & ring->size_mask;
 666                 skb_frags_from = ring->rx_info + (from_index << priv->log_rx_info);
 667                 skb_frags_to = ring->rx_info + (to_index << priv->log_rx_info);
 668                 rx_desc_from = ring->buf + (from_index << ring->log_stride);
 669                 rx_desc_to = ring->buf + (to_index << ring->log_stride);
 670
 671                 for (nr = 0; nr < priv->num_frags; nr++) {
 672                         skb_frags_to[nr].page = skb_frags_from[nr].page;
 673                         skb_frags_to[nr].page_offset = skb_frags_from[nr].page_offset;
 674                         rx_desc_to->data[nr].addr = rx_desc_from->data[nr].addr;
 675                 }
 676         }
 677 }
 678
 679
 680 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 681 {
 682         struct mlx4_en_priv *priv = netdev_priv(dev);
 683         struct mlx4_en_dev *mdev = priv->mdev;
 684         struct mlx4_cqe *cqe;
 685         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 686         struct skb_frag_struct *skb_frags;
 687         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 688         struct mlx4_en_rx_desc *rx_desc;
 689         struct sk_buff *skb;
 690         int index;
 691         int nr;
 692         unsigned int length;
 693         int polled = 0;
 694         int ip_summed;
 695
 696         if (!priv->port_up)
 697                 return 0;
 698
 699         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 700          * descriptor offset can be deduced from the CQE index instead of
 701          * reading 'cqe->index' */
 702         index = cq->mcq.cons_index & ring->size_mask;
 703         cqe = &cq->buf[index];
 704
 705         /* Process all completed CQEs */
 706         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 707                     cq->mcq.cons_index & cq->size)) {
 708
 709                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 710                 rx_desc = ring->buf + (index << ring->log_stride);
 711
 712                 /*
 713                  * make sure we read the CQE after we read the ownership bit
 714                  */
 715                 rmb();
 716
 717                 /* Drop packet on bad receive or bad checksum */
 718                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 719                                                 MLX4_CQE_OPCODE_ERROR)) {
 720                         mlx4_err(mdev, "CQE completed in error - vendor "
 721                                   "syndrom:%d syndrom:%d\n",
 722                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 723                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 724                         goto next;
 725                 }
 726                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 727                         mlx4_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 728                         goto next;
 729                 }
 730
 731                 /*
 732                  * Packet is OK - process it.
 733                  */
 734                 length = be32_to_cpu(cqe->byte_cnt);
 735                 ring->bytes += length;
 736                 ring->packets++;
 737
 738                 if (likely(priv->rx_csum)) {
 739                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 740                             (cqe->checksum == cpu_to_be16(0xffff))) {
 741                                 priv->port_stats.rx_chksum_good++;
 742                                 /* This packet is eligible for LRO if it is:
 743                                  * - DIX Ethernet (type interpretation)
 744                                  * - TCP/IP (v4)
 745                                  * - without IP options
 746                                  * - not an IP fragment */
 747                                 if (mlx4_en_can_lro(cqe->status) &&
 748                                     dev->features & NETIF_F_LRO) {
 749
 750                                         nr = mlx4_en_complete_rx_desc(
 751                                                 priv, rx_desc,
 752                                                 skb_frags, lro_frags,
 753                                                 ring->page_alloc, length);
 754                                         if (!nr)
 755                                                 goto next;
 756
 757                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 758                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 759                                                 lro_vlan_hwaccel_receive_frags(
 760                                                        &ring->lro, lro_frags,
 761                                                        length, length,
 762                                                        priv->vlgrp,
 763                                                        be16_to_cpu(cqe->sl_vid),
 764                                                        NULL, 0);
 765                                         } else
 766                                                 lro_receive_frags(&ring->lro,
 767                                                                   lro_frags,
 768                                                                   length,
 769                                                                   length,
 770                                                                   NULL, 0);
 771
 772                                         goto next;
 773                                 }
 774
 775                                 /* LRO not possible, complete processing here */
 776                                 ip_summed = CHECKSUM_UNNECESSARY;
 777                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 778                         } else {
 779                                 ip_summed = CHECKSUM_NONE;
 780                                 priv->port_stats.rx_chksum_none++;
 781                         }
 782                 } else {
 783                         ip_summed = CHECKSUM_NONE;
 784                         priv->port_stats.rx_chksum_none++;
 785                 }
 786
 787                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 788                                      ring->page_alloc, length);
 789                 if (!skb) {
 790                         priv->stats.rx_dropped++;
 791                         goto next;
 792                 }
 793
 794                 skb->ip_summed = ip_summed;
 795                 skb->protocol = eth_type_trans(skb, dev);
 796                 skb_record_rx_queue(skb, cq->ring);
 797
 798                 /* Push it up the stack */
 799                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 800                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 801                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 802                                                 be16_to_cpu(cqe->sl_vid));
 803                 } else
 804                         netif_receive_skb(skb);
 805
 806 next:
 807                 ++cq->mcq.cons_index;
 808                 index = (cq->mcq.cons_index) & ring->size_mask;
 809                 cqe = &cq->buf[index];
 810                 if (++polled == budget) {
 811                         /* We are here because we reached the NAPI budget -
 812                          * flush only pending LRO sessions */
 813                         lro_flush_all(&ring->lro);
 814                         goto out;
 815                 }
 816         }
 817
 818         /* If CQ is empty flush all LRO sessions unconditionally */
 819         lro_flush_all(&ring->lro);
 820
 821 out:
 822         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 823         mlx4_cq_set_ci(&cq->mcq);
 824         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 825         ring->cons = cq->mcq.cons_index;
 826         ring->prod += polled; /* Polled descriptors were realocated in place */
 827         if (unlikely(!ring->full)) {
 828                 mlx4_en_copy_desc(priv, ring, ring->cons - polled,
 829                                   ring->prod - polled, polled);
 830                 mlx4_en_fill_rx_buf(dev, ring);
 831         }
 832         mlx4_en_update_rx_prod_db(ring);
 833         return polled;
 834 }
 835
 836
 837 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 838 {
 839         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 840         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 841
 842         if (priv->port_up)
 843                 napi_schedule(&cq->napi);
 844         else
 845                 mlx4_en_arm_cq(priv, cq);
 846 }
 847
 848 /* Rx CQ polling - called by NAPI */
 849 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 850 {
 851         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 852         struct net_device *dev = cq->dev;
 853         struct mlx4_en_priv *priv = netdev_priv(dev);
 854         int done;
 855
 856         done = mlx4_en_process_rx_cq(dev, cq, budget);
 857
 858         /* If we used up all the quota - we're probably not done yet... */
 859         if (done == budget)
 860                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 861         else {
 862                 /* Done for now */
 863                 napi_complete(napi);
 864                 mlx4_en_arm_cq(priv, cq);
 865         }
 866         return done;
 867 }
 868
 869
 870 /* Calculate the last offset position that accomodates a full fragment
 871  * (assuming fagment size = stride-align) */
 872 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 873 {
 874         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 875         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 876
 877         mlx4_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 878                             "res:%d offset:%d\n", stride, align, res, offset);
 879         return offset;
 880 }
 881
 882
 883 static int frag_sizes[] = {
 884         FRAG_SZ0,
 885         FRAG_SZ1,
 886         FRAG_SZ2,
 887         FRAG_SZ3
 888 };
 889
 890 void mlx4_en_calc_rx_buf(struct net_device *dev)
 891 {
 892         struct mlx4_en_priv *priv = netdev_priv(dev);
 893         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 894         int buf_size = 0;
 895         int i = 0;
 896
 897         while (buf_size < eff_mtu) {
 898                 priv->frag_info[i].frag_size =
 899                         (eff_mtu > buf_size + frag_sizes[i]) ?
 900                                 frag_sizes[i] : eff_mtu - buf_size;
 901                 priv->frag_info[i].frag_prefix_size = buf_size;
 902                 if (!i) {
 903                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 904                         priv->frag_info[i].frag_stride =
 905                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 906                 } else {
 907                         priv->frag_info[i].frag_align = 0;
 908                         priv->frag_info[i].frag_stride =
 909                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 910                 }
 911                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 912                                                 priv, priv->frag_info[i].frag_stride,
 913                                                 priv->frag_info[i].frag_align);
 914                 buf_size += priv->frag_info[i].frag_size;
 915                 i++;
 916         }
 917
 918         priv->num_frags = i;
 919         priv->rx_skb_size = eff_mtu;
 920         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 921
 922         mlx4_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 923                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 924         for (i = 0; i < priv->num_frags; i++) {
 925                 mlx4_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 926                                 "stride:%d last_offset:%d\n", i,
 927                                 priv->frag_info[i].frag_size,
 928                                 priv->frag_info[i].frag_prefix_size,
 929                                 priv->frag_info[i].frag_align,
 930                                 priv->frag_info[i].frag_stride,
 931                                 priv->frag_info[i].last_offset);
 932         }
 933 }
 934
 935 /* RSS related functions */
 936
 937 /* Calculate rss size and map each entry in rss table to rx ring */
 938 void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv,
 939                                  struct mlx4_en_rss_map *rss_map,
 940                                  int num_entries, int num_rings)
 941 {
 942         int i;
 943
 944         rss_map->size = roundup_pow_of_two(num_entries);
 945         mlx4_dbg(DRV, priv, "Setting default RSS map of %d entires\n",
 946                  rss_map->size);
 947
 948         for (i = 0; i < rss_map->size; i++) {
 949                 rss_map->map[i] = i % num_rings;
 950                 mlx4_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]);
 951         }
 952 }
 953
 954 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv,
 955                                  int qpn, int srqn, int cqn,
 956                                  enum mlx4_qp_state *state,
 957                                  struct mlx4_qp *qp)
 958 {
 959         struct mlx4_en_dev *mdev = priv->mdev;
 960         struct mlx4_qp_context *context;
 961         int err = 0;
 962
 963         context = kmalloc(sizeof *context , GFP_KERNEL);
 964         if (!context) {
 965                 mlx4_err(mdev, "Failed to allocate qp context\n");
 966                 return -ENOMEM;
 967         }
 968
 969         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 970         if (err) {
 971                 mlx4_err(mdev, "Failed to allocate qp #%d\n", qpn);
 972                 goto out;
 973         }
 974         qp->event = mlx4_en_sqp_event;
 975
 976         memset(context, 0, sizeof *context);
 977         mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context);
 978
 979         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state);
 980         if (err) {
 981                 mlx4_qp_remove(mdev->dev, qp);
 982                 mlx4_qp_free(mdev->dev, qp);
 983         }
 984 out:
 985         kfree(context);
 986         return err;
 987 }
 988
 989 /* Allocate rx qp's and configure them according to rss map */
 990 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 991 {
 992         struct mlx4_en_dev *mdev = priv->mdev;
 993         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 994         struct mlx4_qp_context context;
 995         struct mlx4_en_rss_context *rss_context;
 996         void *ptr;
 997         int rss_xor = mdev->profile.rss_xor;
 998         u8 rss_mask = mdev->profile.rss_mask;
 999         int i, srqn, qpn, cqn;
1000         int err = 0;
1001         int good_qps = 0;
1002
1003         mlx4_dbg(DRV, priv, "Configuring rss steering for port %u\n", priv->port);
1004         err = mlx4_qp_reserve_range(mdev->dev, rss_map->size,
1005                                     rss_map->size, &rss_map->base_qpn);
1006         if (err) {
1007                 mlx4_err(mdev, "Failed reserving %d qps for port %u\n",
1008                          rss_map->size, priv->port);
1009                 return err;
1010         }
1011
1012         for (i = 0; i < rss_map->size; i++) {
1013                 cqn = priv->rx_ring[rss_map->map[i]].cqn;
1014                 srqn = priv->rx_ring[rss_map->map[i]].srq.srqn;
1015                 qpn = rss_map->base_qpn + i;
1016                 err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn,
1017                                             &rss_map->state[i],
1018                                             &rss_map->qps[i]);
1019                 if (err)
1020                         goto rss_err;
1021
1022                 ++good_qps;
1023         }
1024
1025         /* Configure RSS indirection qp */
1026         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
1027         if (err) {
1028                 mlx4_err(mdev, "Failed to reserve range for RSS "
1029                                "indirection qp\n");
1030                 goto rss_err;
1031         }
1032         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
1033         if (err) {
1034                 mlx4_err(mdev, "Failed to allocate RSS indirection QP\n");
1035                 goto reserve_err;
1036         }
1037         rss_map->indir_qp.event = mlx4_en_sqp_event;
1038         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1039                                 priv->rx_ring[0].cqn, 0, &context);
1040
1041         ptr = ((void *) &context) + 0x3c;
1042         rss_context = (struct mlx4_en_rss_context *) ptr;
1043         rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 |
1044                                             (rss_map->base_qpn));
1045         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1046         rss_context->hash_fn = rss_xor & 0x3;
1047         rss_context->flags = rss_mask << 2;
1048
1049         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1050                                &rss_map->indir_qp, &rss_map->indir_state);
1051         if (err)
1052                 goto indir_err;
1053
1054         return 0;
1055
1056 indir_err:
1057         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1058                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1059         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1060         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1061 reserve_err:
1062         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1063 rss_err:
1064         for (i = 0; i < good_qps; i++) {
1065                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1066                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1067                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1068                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1069         }
1070         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1071         return err;
1072 }
1073
1074 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1075 {
1076         struct mlx4_en_dev *mdev = priv->mdev;
1077         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1078         int i;
1079
1080         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1081                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1082         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1083         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1084         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1085
1086         for (i = 0; i < rss_map->size; i++) {
1087                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1088                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1089                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1090                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1091         }
1092         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1093 }
1094
1095
1096
1097
1098