git.oblomov.eu Git - 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                 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
 118                        i, page_alloc->page);
 119         }
 120         return 0;
 121
 122 out:
 123         while (i--) {
 124                 page_alloc = &ring->page_alloc[i];
 125                 put_page(page_alloc->page);
 126                 page_alloc->page = NULL;
 127         }
 128         return -ENOMEM;
 129 }
 130
 131 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 132                                       struct mlx4_en_rx_ring *ring)
 133 {
 134         struct mlx4_en_rx_alloc *page_alloc;
 135         int i;
 136
 137         for (i = 0; i < priv->num_frags; i++) {
 138                 page_alloc = &ring->page_alloc[i];
 139                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 140                        i, page_count(page_alloc->page));
 141
 142                 put_page(page_alloc->page);
 143                 page_alloc->page = NULL;
 144         }
 145 }
 146
 147
 148 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 149                                  struct mlx4_en_rx_ring *ring, int index)
 150 {
 151         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 152         struct skb_frag_struct *skb_frags = ring->rx_info +
 153                                             (index << priv->log_rx_info);
 154         int possible_frags;
 155         int i;
 156
 157         /* Pre-link descriptor */
 158         rx_desc->next.next_wqe_index = cpu_to_be16((index + 1) & ring->size_mask);
 159
 160         /* Set size and memtype fields */
 161         for (i = 0; i < priv->num_frags; i++) {
 162                 skb_frags[i].size = priv->frag_info[i].frag_size;
 163                 rx_desc->data[i].byte_count =
 164                         cpu_to_be32(priv->frag_info[i].frag_size);
 165                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 166         }
 167
 168         /* If the number of used fragments does not fill up the ring stride,
 169          * remaining (unused) fragments must be padded with null address/size
 170          * and a special memory key */
 171         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 172         for (i = priv->num_frags; i < possible_frags; i++) {
 173                 rx_desc->data[i].byte_count = 0;
 174                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 175                 rx_desc->data[i].addr = 0;
 176         }
 177 }
 178
 179
 180 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 181                                    struct mlx4_en_rx_ring *ring, int index)
 182 {
 183         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 184         struct skb_frag_struct *skb_frags = ring->rx_info +
 185                                             (index << priv->log_rx_info);
 186         int i;
 187
 188         for (i = 0; i < priv->num_frags; i++)
 189                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
 190                         goto err;
 191
 192         return 0;
 193
 194 err:
 195         while (i--)
 196                 put_page(skb_frags[i].page);
 197         return -ENOMEM;
 198 }
 199
 200 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 201 {
 202         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 203 }
 204
 205 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 206                                  struct mlx4_en_rx_ring *ring,
 207                                  int index)
 208 {
 209         struct mlx4_en_dev *mdev = priv->mdev;
 210         struct skb_frag_struct *skb_frags;
 211         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
 212         dma_addr_t dma;
 213         int nr;
 214
 215         skb_frags = ring->rx_info + (index << priv->log_rx_info);
 216         for (nr = 0; nr < priv->num_frags; nr++) {
 217                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 218                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 219
 220                 en_dbg(DRV, priv, "Unmaping buffer at dma:0x%llx\n", (u64) dma);
 221                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 222                                  PCI_DMA_FROMDEVICE);
 223                 put_page(skb_frags[nr].page);
 224         }
 225 }
 226
 227 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 228 {
 229         struct mlx4_en_rx_ring *ring;
 230         int ring_ind;
 231         int buf_ind;
 232         int new_size;
 233
 234         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 235                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 236                         ring = &priv->rx_ring[ring_ind];
 237
 238                         if (mlx4_en_prepare_rx_desc(priv, ring,
 239                                                     ring->actual_size)) {
 240                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 241                                         en_err(priv, "Failed to allocate "
 242                                                      "enough rx buffers\n");
 243                                         return -ENOMEM;
 244                                 } else {
 245                                         new_size = rounddown_pow_of_two(ring->actual_size);
 246                                         en_warn(priv, "Only %d buffers allocated "
 247                                                       "reducing ring size to %d",
 248                                                 ring->actual_size, new_size);
 249                                         goto reduce_rings;
 250                                 }
 251                         }
 252                         ring->actual_size++;
 253                         ring->prod++;
 254                 }
 255         }
 256         return 0;
 257
 258 reduce_rings:
 259         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 260                 ring = &priv->rx_ring[ring_ind];
 261                 while (ring->actual_size > new_size) {
 262                         ring->actual_size--;
 263                         ring->prod--;
 264                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 265                 }
 266                 ring->size_mask = ring->actual_size - 1;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int mlx4_en_fill_rx_buf(struct net_device *dev,
 273                                struct mlx4_en_rx_ring *ring)
 274 {
 275         struct mlx4_en_priv *priv = netdev_priv(dev);
 276         int num = 0;
 277         int err;
 278
 279         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 280                 err = mlx4_en_prepare_rx_desc(priv, ring, ring->prod &
 281                                               ring->size_mask);
 282                 if (err) {
 283                         if (netif_msg_rx_err(priv))
 284                                 en_warn(priv, "Failed preparing rx descriptor\n");
 285                         priv->port_stats.rx_alloc_failed++;
 286                         break;
 287                 }
 288                 ++num;
 289                 ++ring->prod;
 290         }
 291         if ((u32) (ring->prod - ring->cons) == ring->actual_size)
 292                 ring->full = 1;
 293
 294         return num;
 295 }
 296
 297 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 298                                 struct mlx4_en_rx_ring *ring)
 299 {
 300         int index;
 301
 302         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 303                ring->cons, ring->prod);
 304
 305         /* Unmap and free Rx buffers */
 306         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 307         while (ring->cons != ring->prod) {
 308                 index = ring->cons & ring->size_mask;
 309                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 310                 mlx4_en_free_rx_desc(priv, ring, index);
 311                 ++ring->cons;
 312         }
 313 }
 314
 315
 316 void mlx4_en_rx_refill(struct work_struct *work)
 317 {
 318         struct delayed_work *delay = to_delayed_work(work);
 319         struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
 320                                                  refill_task);
 321         struct mlx4_en_dev *mdev = priv->mdev;
 322         struct net_device *dev = priv->dev;
 323         struct mlx4_en_rx_ring *ring;
 324         int need_refill = 0;
 325         int i;
 326
 327         mutex_lock(&mdev->state_lock);
 328         if (!mdev->device_up || !priv->port_up)
 329                 goto out;
 330
 331         /* We only get here if there are no receive buffers, so we can't race
 332          * with Rx interrupts while filling buffers */
 333         for (i = 0; i < priv->rx_ring_num; i++) {
 334                 ring = &priv->rx_ring[i];
 335                 if (ring->need_refill) {
 336                         if (mlx4_en_fill_rx_buf(dev, ring)) {
 337                                 ring->need_refill = 0;
 338                                 mlx4_en_update_rx_prod_db(ring);
 339                         } else
 340                                 need_refill = 1;
 341                 }
 342         }
 343         if (need_refill)
 344                 queue_delayed_work(mdev->workqueue, &priv->refill_task, HZ);
 345
 346 out:
 347         mutex_unlock(&mdev->state_lock);
 348 }
 349
 350
 351 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 352                            struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
 353 {
 354         struct mlx4_en_dev *mdev = priv->mdev;
 355         int err;
 356         int tmp;
 357
 358         /* Sanity check SRQ size before proceeding */
 359         if (size >= mdev->dev->caps.max_srq_wqes)
 360                 return -EINVAL;
 361
 362         ring->prod = 0;
 363         ring->cons = 0;
 364         ring->size = size;
 365         ring->size_mask = size - 1;
 366         ring->stride = stride;
 367         ring->log_stride = ffs(ring->stride) - 1;
 368         ring->buf_size = ring->size * ring->stride;
 369
 370         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 371                                         sizeof(struct skb_frag_struct));
 372         ring->rx_info = vmalloc(tmp);
 373         if (!ring->rx_info) {
 374                 en_err(priv, "Failed allocating rx_info ring\n");
 375                 return -ENOMEM;
 376         }
 377         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 378                  ring->rx_info, tmp);
 379
 380         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 381                                  ring->buf_size, 2 * PAGE_SIZE);
 382         if (err)
 383                 goto err_ring;
 384
 385         err = mlx4_en_map_buffer(&ring->wqres.buf);
 386         if (err) {
 387                 en_err(priv, "Failed to map RX buffer\n");
 388                 goto err_hwq;
 389         }
 390         ring->buf = ring->wqres.buf.direct.buf;
 391
 392         /* Configure lro mngr */
 393         memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
 394         ring->lro.dev = priv->dev;
 395         ring->lro.features = LRO_F_NAPI;
 396         ring->lro.frag_align_pad = NET_IP_ALIGN;
 397         ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
 398         ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
 399         ring->lro.max_desc = mdev->profile.num_lro;
 400         ring->lro.max_aggr = MAX_SKB_FRAGS;
 401         ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
 402                                     sizeof(struct net_lro_desc),
 403                                     GFP_KERNEL);
 404         if (!ring->lro.lro_arr) {
 405                 en_err(priv, "Failed to allocate lro array\n");
 406                 goto err_map;
 407         }
 408         ring->lro.get_frag_header = mlx4_en_get_frag_header;
 409
 410         return 0;
 411
 412 err_map:
 413         mlx4_en_unmap_buffer(&ring->wqres.buf);
 414 err_hwq:
 415         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 416 err_ring:
 417         vfree(ring->rx_info);
 418         ring->rx_info = NULL;
 419         return err;
 420 }
 421
 422 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 423 {
 424         struct mlx4_en_dev *mdev = priv->mdev;
 425         struct mlx4_wqe_srq_next_seg *next;
 426         struct mlx4_en_rx_ring *ring;
 427         int i;
 428         int ring_ind;
 429         int err;
 430         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 431                                         DS_SIZE * priv->num_frags);
 432         int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE;
 433
 434         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 435                 ring = &priv->rx_ring[ring_ind];
 436
 437                 ring->prod = 0;
 438                 ring->cons = 0;
 439                 ring->actual_size = 0;
 440                 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
 441
 442                 ring->stride = stride;
 443                 ring->log_stride = ffs(ring->stride) - 1;
 444                 ring->buf_size = ring->size * ring->stride;
 445
 446                 memset(ring->buf, 0, ring->buf_size);
 447                 mlx4_en_update_rx_prod_db(ring);
 448
 449                 /* Initailize all descriptors */
 450                 for (i = 0; i < ring->size; i++)
 451                         mlx4_en_init_rx_desc(priv, ring, i);
 452
 453                 /* Initialize page allocators */
 454                 err = mlx4_en_init_allocator(priv, ring);
 455                 if (err) {
 456                         en_err(priv, "Failed initializing ring allocator\n");
 457                         ring_ind--;
 458                         goto err_allocator;
 459                 }
 460
 461                 /* Fill Rx buffers */
 462                 ring->full = 0;
 463         }
 464         err = mlx4_en_fill_rx_buffers(priv);
 465         if (err)
 466                 goto err_buffers;
 467
 468         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 469                 ring = &priv->rx_ring[ring_ind];
 470
 471                 mlx4_en_update_rx_prod_db(ring);
 472
 473                 /* Configure SRQ representing the ring */
 474                 ring->srq.max    = ring->actual_size;
 475                 ring->srq.max_gs = max_gs;
 476                 ring->srq.wqe_shift = ilog2(ring->stride);
 477
 478                 for (i = 0; i < ring->srq.max; ++i) {
 479                         next = get_wqe(ring, i);
 480                         next->next_wqe_index =
 481                         cpu_to_be16((i + 1) & (ring->srq.max - 1));
 482                 }
 483
 484                 err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt,
 485                                      ring->wqres.db.dma, &ring->srq);
 486                 if (err){
 487                         en_err(priv, "Failed to allocate srq\n");
 488                         ring_ind--;
 489                         goto err_srq;
 490                 }
 491                 ring->srq.event = mlx4_en_srq_event;
 492         }
 493
 494         return 0;
 495
 496 err_srq:
 497         while (ring_ind >= 0) {
 498                 ring = &priv->rx_ring[ring_ind];
 499                 mlx4_srq_free(mdev->dev, &ring->srq);
 500                 ring_ind--;
 501         }
 502
 503 err_buffers:
 504         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 505                 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
 506
 507         ring_ind = priv->rx_ring_num - 1;
 508 err_allocator:
 509         while (ring_ind >= 0) {
 510                 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
 511                 ring_ind--;
 512         }
 513         return err;
 514 }
 515
 516 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 517                              struct mlx4_en_rx_ring *ring)
 518 {
 519         struct mlx4_en_dev *mdev = priv->mdev;
 520
 521         kfree(ring->lro.lro_arr);
 522         mlx4_en_unmap_buffer(&ring->wqres.buf);
 523         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 524         vfree(ring->rx_info);
 525         ring->rx_info = NULL;
 526 }
 527
 528 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 529                                 struct mlx4_en_rx_ring *ring)
 530 {
 531         struct mlx4_en_dev *mdev = priv->mdev;
 532
 533         mlx4_srq_free(mdev->dev, &ring->srq);
 534         mlx4_en_free_rx_buf(priv, ring);
 535         mlx4_en_destroy_allocator(priv, ring);
 536 }
 537
 538
 539 /* Unmap a completed descriptor and free unused pages */
 540 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 541                                     struct mlx4_en_rx_desc *rx_desc,
 542                                     struct skb_frag_struct *skb_frags,
 543                                     struct skb_frag_struct *skb_frags_rx,
 544                                     struct mlx4_en_rx_alloc *page_alloc,
 545                                     int length)
 546 {
 547         struct mlx4_en_dev *mdev = priv->mdev;
 548         struct mlx4_en_frag_info *frag_info;
 549         int nr;
 550         dma_addr_t dma;
 551
 552         /* Collect used fragments while replacing them in the HW descirptors */
 553         for (nr = 0; nr < priv->num_frags; nr++) {
 554                 frag_info = &priv->frag_info[nr];
 555                 if (length <= frag_info->frag_prefix_size)
 556                         break;
 557
 558                 /* Save page reference in skb */
 559                 skb_frags_rx[nr].page = skb_frags[nr].page;
 560                 skb_frags_rx[nr].size = skb_frags[nr].size;
 561                 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
 562                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 563
 564                 /* Allocate a replacement page */
 565                 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
 566                         goto fail;
 567
 568                 /* Unmap buffer */
 569                 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
 570                                  PCI_DMA_FROMDEVICE);
 571         }
 572         /* Adjust size of last fragment to match actual length */
 573         skb_frags_rx[nr - 1].size = length -
 574                 priv->frag_info[nr - 1].frag_prefix_size;
 575         return nr;
 576
 577 fail:
 578         /* Drop all accumulated fragments (which have already been replaced in
 579          * the descriptor) of this packet; remaining fragments are reused... */
 580         while (nr > 0) {
 581                 nr--;
 582                 put_page(skb_frags_rx[nr].page);
 583         }
 584         return 0;
 585 }
 586
 587
 588 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 589                                       struct mlx4_en_rx_desc *rx_desc,
 590                                       struct skb_frag_struct *skb_frags,
 591                                       struct mlx4_en_rx_alloc *page_alloc,
 592                                       unsigned int length)
 593 {
 594         struct mlx4_en_dev *mdev = priv->mdev;
 595         struct sk_buff *skb;
 596         void *va;
 597         int used_frags;
 598         dma_addr_t dma;
 599
 600         skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
 601         if (!skb) {
 602                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 603                 return NULL;
 604         }
 605         skb->dev = priv->dev;
 606         skb_reserve(skb, NET_IP_ALIGN);
 607         skb->len = length;
 608         skb->truesize = length + sizeof(struct sk_buff);
 609
 610         /* Get pointer to first fragment so we could copy the headers into the
 611          * (linear part of the) skb */
 612         va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
 613
 614         if (length <= SMALL_PACKET_SIZE) {
 615                 /* We are copying all relevant data to the skb - temporarily
 616                  * synch buffers for the copy */
 617                 dma = be64_to_cpu(rx_desc->data[0].addr);
 618                 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
 619                                               length, DMA_FROM_DEVICE);
 620                 skb_copy_to_linear_data(skb, va, length);
 621                 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
 622                                                  length, DMA_FROM_DEVICE);
 623                 skb->tail += length;
 624         } else {
 625
 626                 /* Move relevant fragments to skb */
 627                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
 628                                                       skb_shinfo(skb)->frags,
 629                                                       page_alloc, length);
 630                 if (unlikely(!used_frags)) {
 631                         kfree_skb(skb);
 632                         return NULL;
 633                 }
 634                 skb_shinfo(skb)->nr_frags = used_frags;
 635
 636                 /* Copy headers into the skb linear buffer */
 637                 memcpy(skb->data, va, HEADER_COPY_SIZE);
 638                 skb->tail += HEADER_COPY_SIZE;
 639
 640                 /* Skip headers in first fragment */
 641                 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
 642
 643                 /* Adjust size of first fragment */
 644                 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
 645                 skb->data_len = length - HEADER_COPY_SIZE;
 646         }
 647         return skb;
 648 }
 649
 650 static void mlx4_en_copy_desc(struct mlx4_en_priv *priv,
 651                               struct mlx4_en_rx_ring *ring,
 652                               int from, int to, int num)
 653 {
 654         struct skb_frag_struct *skb_frags_from;
 655         struct skb_frag_struct *skb_frags_to;
 656         struct mlx4_en_rx_desc *rx_desc_from;
 657         struct mlx4_en_rx_desc *rx_desc_to;
 658         int from_index, to_index;
 659         int nr, i;
 660
 661         for (i = 0; i < num; i++) {
 662                 from_index = (from + i) & ring->size_mask;
 663                 to_index = (to + i) & ring->size_mask;
 664                 skb_frags_from = ring->rx_info + (from_index << priv->log_rx_info);
 665                 skb_frags_to = ring->rx_info + (to_index << priv->log_rx_info);
 666                 rx_desc_from = ring->buf + (from_index << ring->log_stride);
 667                 rx_desc_to = ring->buf + (to_index << ring->log_stride);
 668
 669                 for (nr = 0; nr < priv->num_frags; nr++) {
 670                         skb_frags_to[nr].page = skb_frags_from[nr].page;
 671                         skb_frags_to[nr].page_offset = skb_frags_from[nr].page_offset;
 672                         rx_desc_to->data[nr].addr = rx_desc_from->data[nr].addr;
 673                 }
 674         }
 675 }
 676
 677
 678 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 679 {
 680         struct mlx4_en_priv *priv = netdev_priv(dev);
 681         struct mlx4_cqe *cqe;
 682         struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
 683         struct skb_frag_struct *skb_frags;
 684         struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
 685         struct mlx4_en_rx_desc *rx_desc;
 686         struct sk_buff *skb;
 687         int index;
 688         int nr;
 689         unsigned int length;
 690         int polled = 0;
 691         int ip_summed;
 692
 693         if (!priv->port_up)
 694                 return 0;
 695
 696         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 697          * descriptor offset can be deduced from the CQE index instead of
 698          * reading 'cqe->index' */
 699         index = cq->mcq.cons_index & ring->size_mask;
 700         cqe = &cq->buf[index];
 701
 702         /* Process all completed CQEs */
 703         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 704                     cq->mcq.cons_index & cq->size)) {
 705
 706                 skb_frags = ring->rx_info + (index << priv->log_rx_info);
 707                 rx_desc = ring->buf + (index << ring->log_stride);
 708
 709                 /*
 710                  * make sure we read the CQE after we read the ownership bit
 711                  */
 712                 rmb();
 713
 714                 /* Drop packet on bad receive or bad checksum */
 715                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 716                                                 MLX4_CQE_OPCODE_ERROR)) {
 717                         en_err(priv, "CQE completed in error - vendor "
 718                                   "syndrom:%d syndrom:%d\n",
 719                                   ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
 720                                   ((struct mlx4_err_cqe *) cqe)->syndrome);
 721                         goto next;
 722                 }
 723                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 724                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 725                         goto next;
 726                 }
 727
 728                 /*
 729                  * Packet is OK - process it.
 730                  */
 731                 length = be32_to_cpu(cqe->byte_cnt);
 732                 ring->bytes += length;
 733                 ring->packets++;
 734
 735                 if (likely(priv->rx_csum)) {
 736                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 737                             (cqe->checksum == cpu_to_be16(0xffff))) {
 738                                 priv->port_stats.rx_chksum_good++;
 739                                 /* This packet is eligible for LRO if it is:
 740                                  * - DIX Ethernet (type interpretation)
 741                                  * - TCP/IP (v4)
 742                                  * - without IP options
 743                                  * - not an IP fragment */
 744                                 if (mlx4_en_can_lro(cqe->status) &&
 745                                     dev->features & NETIF_F_LRO) {
 746
 747                                         nr = mlx4_en_complete_rx_desc(
 748                                                 priv, rx_desc,
 749                                                 skb_frags, lro_frags,
 750                                                 ring->page_alloc, length);
 751                                         if (!nr)
 752                                                 goto next;
 753
 754                                         if (priv->vlgrp && (cqe->vlan_my_qpn &
 755                                                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
 756                                                 lro_vlan_hwaccel_receive_frags(
 757                                                        &ring->lro, lro_frags,
 758                                                        length, length,
 759                                                        priv->vlgrp,
 760                                                        be16_to_cpu(cqe->sl_vid),
 761                                                        NULL, 0);
 762                                         } else
 763                                                 lro_receive_frags(&ring->lro,
 764                                                                   lro_frags,
 765                                                                   length,
 766                                                                   length,
 767                                                                   NULL, 0);
 768
 769                                         goto next;
 770                                 }
 771
 772                                 /* LRO not possible, complete processing here */
 773                                 ip_summed = CHECKSUM_UNNECESSARY;
 774                                 INC_PERF_COUNTER(priv->pstats.lro_misses);
 775                         } else {
 776                                 ip_summed = CHECKSUM_NONE;
 777                                 priv->port_stats.rx_chksum_none++;
 778                         }
 779                 } else {
 780                         ip_summed = CHECKSUM_NONE;
 781                         priv->port_stats.rx_chksum_none++;
 782                 }
 783
 784                 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
 785                                      ring->page_alloc, length);
 786                 if (!skb) {
 787                         priv->stats.rx_dropped++;
 788                         goto next;
 789                 }
 790
 791                 skb->ip_summed = ip_summed;
 792                 skb->protocol = eth_type_trans(skb, dev);
 793                 skb_record_rx_queue(skb, cq->ring);
 794
 795                 /* Push it up the stack */
 796                 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
 797                                     MLX4_CQE_VLAN_PRESENT_MASK)) {
 798                         vlan_hwaccel_receive_skb(skb, priv->vlgrp,
 799                                                 be16_to_cpu(cqe->sl_vid));
 800                 } else
 801                         netif_receive_skb(skb);
 802
 803 next:
 804                 ++cq->mcq.cons_index;
 805                 index = (cq->mcq.cons_index) & ring->size_mask;
 806                 cqe = &cq->buf[index];
 807                 if (++polled == budget) {
 808                         /* We are here because we reached the NAPI budget -
 809                          * flush only pending LRO sessions */
 810                         lro_flush_all(&ring->lro);
 811                         goto out;
 812                 }
 813         }
 814
 815         /* If CQ is empty flush all LRO sessions unconditionally */
 816         lro_flush_all(&ring->lro);
 817
 818 out:
 819         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 820         mlx4_cq_set_ci(&cq->mcq);
 821         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 822         ring->cons = cq->mcq.cons_index;
 823         ring->prod += polled; /* Polled descriptors were realocated in place */
 824         if (unlikely(!ring->full)) {
 825                 mlx4_en_copy_desc(priv, ring, ring->cons - polled,
 826                                   ring->prod - polled, polled);
 827                 mlx4_en_fill_rx_buf(dev, ring);
 828         }
 829         mlx4_en_update_rx_prod_db(ring);
 830         return polled;
 831 }
 832
 833
 834 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 835 {
 836         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 837         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 838
 839         if (priv->port_up)
 840                 napi_schedule(&cq->napi);
 841         else
 842                 mlx4_en_arm_cq(priv, cq);
 843 }
 844
 845 /* Rx CQ polling - called by NAPI */
 846 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 847 {
 848         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 849         struct net_device *dev = cq->dev;
 850         struct mlx4_en_priv *priv = netdev_priv(dev);
 851         int done;
 852
 853         done = mlx4_en_process_rx_cq(dev, cq, budget);
 854
 855         /* If we used up all the quota - we're probably not done yet... */
 856         if (done == budget)
 857                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 858         else {
 859                 /* Done for now */
 860                 napi_complete(napi);
 861                 mlx4_en_arm_cq(priv, cq);
 862         }
 863         return done;
 864 }
 865
 866
 867 /* Calculate the last offset position that accomodates a full fragment
 868  * (assuming fagment size = stride-align) */
 869 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
 870 {
 871         u16 res = MLX4_EN_ALLOC_SIZE % stride;
 872         u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
 873
 874         en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
 875                             "res:%d offset:%d\n", stride, align, res, offset);
 876         return offset;
 877 }
 878
 879
 880 static int frag_sizes[] = {
 881         FRAG_SZ0,
 882         FRAG_SZ1,
 883         FRAG_SZ2,
 884         FRAG_SZ3
 885 };
 886
 887 void mlx4_en_calc_rx_buf(struct net_device *dev)
 888 {
 889         struct mlx4_en_priv *priv = netdev_priv(dev);
 890         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
 891         int buf_size = 0;
 892         int i = 0;
 893
 894         while (buf_size < eff_mtu) {
 895                 priv->frag_info[i].frag_size =
 896                         (eff_mtu > buf_size + frag_sizes[i]) ?
 897                                 frag_sizes[i] : eff_mtu - buf_size;
 898                 priv->frag_info[i].frag_prefix_size = buf_size;
 899                 if (!i) {
 900                         priv->frag_info[i].frag_align = NET_IP_ALIGN;
 901                         priv->frag_info[i].frag_stride =
 902                                 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
 903                 } else {
 904                         priv->frag_info[i].frag_align = 0;
 905                         priv->frag_info[i].frag_stride =
 906                                 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
 907                 }
 908                 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
 909                                                 priv, priv->frag_info[i].frag_stride,
 910                                                 priv->frag_info[i].frag_align);
 911                 buf_size += priv->frag_info[i].frag_size;
 912                 i++;
 913         }
 914
 915         priv->num_frags = i;
 916         priv->rx_skb_size = eff_mtu;
 917         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
 918
 919         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
 920                   "num_frags:%d):\n", eff_mtu, priv->num_frags);
 921         for (i = 0; i < priv->num_frags; i++) {
 922                 en_dbg(DRV, priv, "  frag:%d - size:%d prefix:%d align:%d "
 923                                 "stride:%d last_offset:%d\n", i,
 924                                 priv->frag_info[i].frag_size,
 925                                 priv->frag_info[i].frag_prefix_size,
 926                                 priv->frag_info[i].frag_align,
 927                                 priv->frag_info[i].frag_stride,
 928                                 priv->frag_info[i].last_offset);
 929         }
 930 }
 931
 932 /* RSS related functions */
 933
 934 /* Calculate rss size and map each entry in rss table to rx ring */
 935 void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv,
 936                                  struct mlx4_en_rss_map *rss_map,
 937                                  int num_entries, int num_rings)
 938 {
 939         int i;
 940
 941         rss_map->size = roundup_pow_of_two(num_entries);
 942         en_dbg(DRV, priv, "Setting default RSS map of %d entires\n",
 943                rss_map->size);
 944
 945         for (i = 0; i < rss_map->size; i++) {
 946                 rss_map->map[i] = i % num_rings;
 947                 en_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]);
 948         }
 949 }
 950
 951 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv,
 952                                  int qpn, int srqn, int cqn,
 953                                  enum mlx4_qp_state *state,
 954                                  struct mlx4_qp *qp)
 955 {
 956         struct mlx4_en_dev *mdev = priv->mdev;
 957         struct mlx4_qp_context *context;
 958         int err = 0;
 959
 960         context = kmalloc(sizeof *context , GFP_KERNEL);
 961         if (!context) {
 962                 en_err(priv, "Failed to allocate qp context\n");
 963                 return -ENOMEM;
 964         }
 965
 966         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
 967         if (err) {
 968                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
 969                 goto out;
 970         }
 971         qp->event = mlx4_en_sqp_event;
 972
 973         memset(context, 0, sizeof *context);
 974         mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context);
 975
 976         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state);
 977         if (err) {
 978                 mlx4_qp_remove(mdev->dev, qp);
 979                 mlx4_qp_free(mdev->dev, qp);
 980         }
 981 out:
 982         kfree(context);
 983         return err;
 984 }
 985
 986 /* Allocate rx qp's and configure them according to rss map */
 987 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
 988 {
 989         struct mlx4_en_dev *mdev = priv->mdev;
 990         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
 991         struct mlx4_qp_context context;
 992         struct mlx4_en_rss_context *rss_context;
 993         void *ptr;
 994         int rss_xor = mdev->profile.rss_xor;
 995         u8 rss_mask = mdev->profile.rss_mask;
 996         int i, srqn, qpn, cqn;
 997         int err = 0;
 998         int good_qps = 0;
 999
1000         en_dbg(DRV, priv, "Configuring rss steering\n");
1001         err = mlx4_qp_reserve_range(mdev->dev, rss_map->size,
1002                                     rss_map->size, &rss_map->base_qpn);
1003         if (err) {
1004                 en_err(priv, "Failed reserving %d qps\n", rss_map->size);
1005                 return err;
1006         }
1007
1008         for (i = 0; i < rss_map->size; i++) {
1009                 cqn = priv->rx_ring[rss_map->map[i]].cqn;
1010                 srqn = priv->rx_ring[rss_map->map[i]].srq.srqn;
1011                 qpn = rss_map->base_qpn + i;
1012                 err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn,
1013                                             &rss_map->state[i],
1014                                             &rss_map->qps[i]);
1015                 if (err)
1016                         goto rss_err;
1017
1018                 ++good_qps;
1019         }
1020
1021         /* Configure RSS indirection qp */
1022         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
1023         if (err) {
1024                 en_err(priv, "Failed to reserve range for RSS "
1025                              "indirection qp\n");
1026                 goto rss_err;
1027         }
1028         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
1029         if (err) {
1030                 en_err(priv, "Failed to allocate RSS indirection QP\n");
1031                 goto reserve_err;
1032         }
1033         rss_map->indir_qp.event = mlx4_en_sqp_event;
1034         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1035                                 priv->rx_ring[0].cqn, 0, &context);
1036
1037         ptr = ((void *) &context) + 0x3c;
1038         rss_context = (struct mlx4_en_rss_context *) ptr;
1039         rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 |
1040                                             (rss_map->base_qpn));
1041         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1042         rss_context->hash_fn = rss_xor & 0x3;
1043         rss_context->flags = rss_mask << 2;
1044
1045         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1046                                &rss_map->indir_qp, &rss_map->indir_state);
1047         if (err)
1048                 goto indir_err;
1049
1050         return 0;
1051
1052 indir_err:
1053         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1054                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1055         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1056         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1057 reserve_err:
1058         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1059 rss_err:
1060         for (i = 0; i < good_qps; i++) {
1061                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1062                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1063                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1064                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1065         }
1066         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1067         return err;
1068 }
1069
1070 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1071 {
1072         struct mlx4_en_dev *mdev = priv->mdev;
1073         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1074         int i;
1075
1076         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1077                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1078         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1079         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1080         mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1081
1082         for (i = 0; i < rss_map->size; i++) {
1083                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1084                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1085                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1086                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1087         }
1088         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1089 }
1090
1091
1092
1093
1094