drivers/net/ethernet/mellanox/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 <net/busy_poll.h>
  35 #include <linux/mlx4/cq.h>
  36 #include <linux/slab.h>
  37 #include <linux/mlx4/qp.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/rculist.h>
  40 #include <linux/if_ether.h>
  41 #include <linux/if_vlan.h>
  42 #include <linux/vmalloc.h>
  43 #include <linux/irq.h>
  44
  45 #if IS_ENABLED(CONFIG_IPV6)
  46 #include <net/ip6_checksum.h>
  47 #endif
  48
  49 #include "mlx4_en.h"
  50
  51 static int mlx4_alloc_pages(struct mlx4_en_priv *priv,
  52                             struct mlx4_en_rx_alloc *page_alloc,
  53                             const struct mlx4_en_frag_info *frag_info,
  54                             gfp_t _gfp)
  55 {
  56         int order;
  57         struct page *page;
  58         dma_addr_t dma;
  59
  60         for (order = MLX4_EN_ALLOC_PREFER_ORDER; ;) {
  61                 gfp_t gfp = _gfp;
  62
  63                 if (order)
  64                         gfp |= __GFP_COMP | __GFP_NOWARN;
  65                 page = alloc_pages(gfp, order);
  66                 if (likely(page))
  67                         break;
  68                 if (--order < 0 ||
  69                     ((PAGE_SIZE << order) < frag_info->frag_size))
  70                         return -ENOMEM;
  71         }
  72         dma = dma_map_page(priv->ddev, page, 0, PAGE_SIZE << order,
  73                            PCI_DMA_FROMDEVICE);
  74         if (dma_mapping_error(priv->ddev, dma)) {
  75                 put_page(page);
  76                 return -ENOMEM;
  77         }
  78         page_alloc->page_size = PAGE_SIZE << order;
  79         page_alloc->page = page;
  80         page_alloc->dma = dma;
  81         page_alloc->page_offset = 0;
  82         /* Not doing get_page() for each frag is a big win
  83          * on asymetric workloads. Note we can not use atomic_set().
  84          */
  85         atomic_add(page_alloc->page_size / frag_info->frag_stride - 1,
  86                    &page->_count);
  87         return 0;
  88 }
  89
  90 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
  91                                struct mlx4_en_rx_desc *rx_desc,
  92                                struct mlx4_en_rx_alloc *frags,
  93                                struct mlx4_en_rx_alloc *ring_alloc,
  94                                gfp_t gfp)
  95 {
  96         struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
  97         const struct mlx4_en_frag_info *frag_info;
  98         struct page *page;
  99         dma_addr_t dma;
 100         int i;
 101
 102         for (i = 0; i < priv->num_frags; i++) {
 103                 frag_info = &priv->frag_info[i];
 104                 page_alloc[i] = ring_alloc[i];
 105                 page_alloc[i].page_offset += frag_info->frag_stride;
 106
 107                 if (page_alloc[i].page_offset + frag_info->frag_stride <=
 108                     ring_alloc[i].page_size)
 109                         continue;
 110
 111                 if (mlx4_alloc_pages(priv, &page_alloc[i], frag_info, gfp))
 112                         goto out;
 113         }
 114
 115         for (i = 0; i < priv->num_frags; i++) {
 116                 frags[i] = ring_alloc[i];
 117                 dma = ring_alloc[i].dma + ring_alloc[i].page_offset;
 118                 ring_alloc[i] = page_alloc[i];
 119                 rx_desc->data[i].addr = cpu_to_be64(dma);
 120         }
 121
 122         return 0;
 123
 124 out:
 125         while (i--) {
 126                 if (page_alloc[i].page != ring_alloc[i].page) {
 127                         dma_unmap_page(priv->ddev, page_alloc[i].dma,
 128                                 page_alloc[i].page_size, PCI_DMA_FROMDEVICE);
 129                         page = page_alloc[i].page;
 130                         atomic_set(&page->_count, 1);
 131                         put_page(page);
 132                 }
 133         }
 134         return -ENOMEM;
 135 }
 136
 137 static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
 138                               struct mlx4_en_rx_alloc *frags,
 139                               int i)
 140 {
 141         const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 142         u32 next_frag_end = frags[i].page_offset + 2 * frag_info->frag_stride;
 143
 144
 145         if (next_frag_end > frags[i].page_size)
 146                 dma_unmap_page(priv->ddev, frags[i].dma, frags[i].page_size,
 147                                PCI_DMA_FROMDEVICE);
 148
 149         if (frags[i].page)
 150                 put_page(frags[i].page);
 151 }
 152
 153 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
 154                                   struct mlx4_en_rx_ring *ring)
 155 {
 156         int i;
 157         struct mlx4_en_rx_alloc *page_alloc;
 158
 159         for (i = 0; i < priv->num_frags; i++) {
 160                 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 161
 162                 if (mlx4_alloc_pages(priv, &ring->page_alloc[i],
 163                                      frag_info, GFP_KERNEL | __GFP_COLD))
 164                         goto out;
 165
 166                 en_dbg(DRV, priv, "  frag %d allocator: - size:%d frags:%d\n",
 167                        i, ring->page_alloc[i].page_size,
 168                        atomic_read(&ring->page_alloc[i].page->_count));
 169         }
 170         return 0;
 171
 172 out:
 173         while (i--) {
 174                 struct page *page;
 175
 176                 page_alloc = &ring->page_alloc[i];
 177                 dma_unmap_page(priv->ddev, page_alloc->dma,
 178                                page_alloc->page_size, PCI_DMA_FROMDEVICE);
 179                 page = page_alloc->page;
 180                 atomic_set(&page->_count, 1);
 181                 put_page(page);
 182                 page_alloc->page = NULL;
 183         }
 184         return -ENOMEM;
 185 }
 186
 187 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
 188                                       struct mlx4_en_rx_ring *ring)
 189 {
 190         struct mlx4_en_rx_alloc *page_alloc;
 191         int i;
 192
 193         for (i = 0; i < priv->num_frags; i++) {
 194                 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
 195
 196                 page_alloc = &ring->page_alloc[i];
 197                 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
 198                        i, page_count(page_alloc->page));
 199
 200                 dma_unmap_page(priv->ddev, page_alloc->dma,
 201                                 page_alloc->page_size, PCI_DMA_FROMDEVICE);
 202                 while (page_alloc->page_offset + frag_info->frag_stride <
 203                        page_alloc->page_size) {
 204                         put_page(page_alloc->page);
 205                         page_alloc->page_offset += frag_info->frag_stride;
 206                 }
 207                 page_alloc->page = NULL;
 208         }
 209 }
 210
 211 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
 212                                  struct mlx4_en_rx_ring *ring, int index)
 213 {
 214         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 215         int possible_frags;
 216         int i;
 217
 218         /* Set size and memtype fields */
 219         for (i = 0; i < priv->num_frags; i++) {
 220                 rx_desc->data[i].byte_count =
 221                         cpu_to_be32(priv->frag_info[i].frag_size);
 222                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 223         }
 224
 225         /* If the number of used fragments does not fill up the ring stride,
 226          * remaining (unused) fragments must be padded with null address/size
 227          * and a special memory key */
 228         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 229         for (i = priv->num_frags; i < possible_frags; i++) {
 230                 rx_desc->data[i].byte_count = 0;
 231                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 232                 rx_desc->data[i].addr = 0;
 233         }
 234 }
 235
 236 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 237                                    struct mlx4_en_rx_ring *ring, int index,
 238                                    gfp_t gfp)
 239 {
 240         struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
 241         struct mlx4_en_rx_alloc *frags = ring->rx_info +
 242                                         (index << priv->log_rx_info);
 243
 244         return mlx4_en_alloc_frags(priv, rx_desc, frags, ring->page_alloc, gfp);
 245 }
 246
 247 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 248 {
 249         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 250 }
 251
 252 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
 253                                  struct mlx4_en_rx_ring *ring,
 254                                  int index)
 255 {
 256         struct mlx4_en_rx_alloc *frags;
 257         int nr;
 258
 259         frags = ring->rx_info + (index << priv->log_rx_info);
 260         for (nr = 0; nr < priv->num_frags; nr++) {
 261                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 262                 mlx4_en_free_frag(priv, frags, nr);
 263         }
 264 }
 265
 266 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 267 {
 268         struct mlx4_en_rx_ring *ring;
 269         int ring_ind;
 270         int buf_ind;
 271         int new_size;
 272
 273         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 274                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 275                         ring = priv->rx_ring[ring_ind];
 276
 277                         if (mlx4_en_prepare_rx_desc(priv, ring,
 278                                                     ring->actual_size,
 279                                                     GFP_KERNEL | __GFP_COLD)) {
 280                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 281                                         en_err(priv, "Failed to allocate enough rx buffers\n");
 282                                         return -ENOMEM;
 283                                 } else {
 284                                         new_size = rounddown_pow_of_two(ring->actual_size);
 285                                         en_warn(priv, "Only %d buffers allocated reducing ring size to %d\n",
 286                                                 ring->actual_size, new_size);
 287                                         goto reduce_rings;
 288                                 }
 289                         }
 290                         ring->actual_size++;
 291                         ring->prod++;
 292                 }
 293         }
 294         return 0;
 295
 296 reduce_rings:
 297         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 298                 ring = priv->rx_ring[ring_ind];
 299                 while (ring->actual_size > new_size) {
 300                         ring->actual_size--;
 301                         ring->prod--;
 302                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 303                 }
 304         }
 305
 306         return 0;
 307 }
 308
 309 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 310                                 struct mlx4_en_rx_ring *ring)
 311 {
 312         int index;
 313
 314         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 315                ring->cons, ring->prod);
 316
 317         /* Unmap and free Rx buffers */
 318         BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
 319         while (ring->cons != ring->prod) {
 320                 index = ring->cons & ring->size_mask;
 321                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 322                 mlx4_en_free_rx_desc(priv, ring, index);
 323                 ++ring->cons;
 324         }
 325 }
 326
 327 void mlx4_en_set_num_rx_rings(struct mlx4_en_dev *mdev)
 328 {
 329         int i;
 330         int num_of_eqs;
 331         int num_rx_rings;
 332         struct mlx4_dev *dev = mdev->dev;
 333
 334         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 335                 if (!dev->caps.comp_pool)
 336                         num_of_eqs = max_t(int, MIN_RX_RINGS,
 337                                            min_t(int,
 338                                                  dev->caps.num_comp_vectors,
 339                                                  DEF_RX_RINGS));
 340                 else
 341                         num_of_eqs = min_t(int, MAX_MSIX_P_PORT,
 342                                            dev->caps.comp_pool/
 343                                            dev->caps.num_ports) - 1;
 344
 345                 num_rx_rings = mlx4_low_memory_profile() ? MIN_RX_RINGS :
 346                         min_t(int, num_of_eqs,
 347                               netif_get_num_default_rss_queues());
 348                 mdev->profile.prof[i].rx_ring_num =
 349                         rounddown_pow_of_two(num_rx_rings);
 350         }
 351 }
 352
 353 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 354                            struct mlx4_en_rx_ring **pring,
 355                            u32 size, u16 stride, int node)
 356 {
 357         struct mlx4_en_dev *mdev = priv->mdev;
 358         struct mlx4_en_rx_ring *ring;
 359         int err = -ENOMEM;
 360         int tmp;
 361
 362         ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
 363         if (!ring) {
 364                 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 365                 if (!ring) {
 366                         en_err(priv, "Failed to allocate RX ring structure\n");
 367                         return -ENOMEM;
 368                 }
 369         }
 370
 371         ring->prod = 0;
 372         ring->cons = 0;
 373         ring->size = size;
 374         ring->size_mask = size - 1;
 375         ring->stride = stride;
 376         ring->log_stride = ffs(ring->stride) - 1;
 377         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 378
 379         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 380                                         sizeof(struct mlx4_en_rx_alloc));
 381         ring->rx_info = vmalloc_node(tmp, node);
 382         if (!ring->rx_info) {
 383                 ring->rx_info = vmalloc(tmp);
 384                 if (!ring->rx_info) {
 385                         err = -ENOMEM;
 386                         goto err_ring;
 387                 }
 388         }
 389
 390         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 391                  ring->rx_info, tmp);
 392
 393         /* Allocate HW buffers on provided NUMA node */
 394         set_dev_node(&mdev->dev->persist->pdev->dev, node);
 395         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
 396                                  ring->buf_size, 2 * PAGE_SIZE);
 397         set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
 398         if (err)
 399                 goto err_info;
 400
 401         err = mlx4_en_map_buffer(&ring->wqres.buf);
 402         if (err) {
 403                 en_err(priv, "Failed to map RX buffer\n");
 404                 goto err_hwq;
 405         }
 406         ring->buf = ring->wqres.buf.direct.buf;
 407
 408         ring->hwtstamp_rx_filter = priv->hwtstamp_config.rx_filter;
 409
 410         *pring = ring;
 411         return 0;
 412
 413 err_hwq:
 414         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 415 err_info:
 416         vfree(ring->rx_info);
 417         ring->rx_info = NULL;
 418 err_ring:
 419         kfree(ring);
 420         *pring = NULL;
 421
 422         return err;
 423 }
 424
 425 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 426 {
 427         struct mlx4_en_rx_ring *ring;
 428         int i;
 429         int ring_ind;
 430         int err;
 431         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 432                                         DS_SIZE * priv->num_frags);
 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                 if (ring->stride <= TXBB_SIZE)
 444                         ring->buf += TXBB_SIZE;
 445
 446                 ring->log_stride = ffs(ring->stride) - 1;
 447                 ring->buf_size = ring->size * ring->stride;
 448
 449                 memset(ring->buf, 0, ring->buf_size);
 450                 mlx4_en_update_rx_prod_db(ring);
 451
 452                 /* Initialize all descriptors */
 453                 for (i = 0; i < ring->size; i++)
 454                         mlx4_en_init_rx_desc(priv, ring, i);
 455
 456                 /* Initialize page allocators */
 457                 err = mlx4_en_init_allocator(priv, ring);
 458                 if (err) {
 459                         en_err(priv, "Failed initializing ring allocator\n");
 460                         if (ring->stride <= TXBB_SIZE)
 461                                 ring->buf -= TXBB_SIZE;
 462                         ring_ind--;
 463                         goto err_allocator;
 464                 }
 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                 ring->size_mask = ring->actual_size - 1;
 474                 mlx4_en_update_rx_prod_db(ring);
 475         }
 476
 477         return 0;
 478
 479 err_buffers:
 480         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 481                 mlx4_en_free_rx_buf(priv, priv->rx_ring[ring_ind]);
 482
 483         ring_ind = priv->rx_ring_num - 1;
 484 err_allocator:
 485         while (ring_ind >= 0) {
 486                 if (priv->rx_ring[ring_ind]->stride <= TXBB_SIZE)
 487                         priv->rx_ring[ring_ind]->buf -= TXBB_SIZE;
 488                 mlx4_en_destroy_allocator(priv, priv->rx_ring[ring_ind]);
 489                 ring_ind--;
 490         }
 491         return err;
 492 }
 493
 494 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 495                              struct mlx4_en_rx_ring **pring,
 496                              u32 size, u16 stride)
 497 {
 498         struct mlx4_en_dev *mdev = priv->mdev;
 499         struct mlx4_en_rx_ring *ring = *pring;
 500
 501         mlx4_en_unmap_buffer(&ring->wqres.buf);
 502         mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
 503         vfree(ring->rx_info);
 504         ring->rx_info = NULL;
 505         kfree(ring);
 506         *pring = NULL;
 507 #ifdef CONFIG_RFS_ACCEL
 508         mlx4_en_cleanup_filters(priv);
 509 #endif
 510 }
 511
 512 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 513                                 struct mlx4_en_rx_ring *ring)
 514 {
 515         mlx4_en_free_rx_buf(priv, ring);
 516         if (ring->stride <= TXBB_SIZE)
 517                 ring->buf -= TXBB_SIZE;
 518         mlx4_en_destroy_allocator(priv, ring);
 519 }
 520
 521
 522 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 523                                     struct mlx4_en_rx_desc *rx_desc,
 524                                     struct mlx4_en_rx_alloc *frags,
 525                                     struct sk_buff *skb,
 526                                     int length)
 527 {
 528         struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
 529         struct mlx4_en_frag_info *frag_info;
 530         int nr;
 531         dma_addr_t dma;
 532
 533         /* Collect used fragments while replacing them in the HW descriptors */
 534         for (nr = 0; nr < priv->num_frags; nr++) {
 535                 frag_info = &priv->frag_info[nr];
 536                 if (length <= frag_info->frag_prefix_size)
 537                         break;
 538                 if (!frags[nr].page)
 539                         goto fail;
 540
 541                 dma = be64_to_cpu(rx_desc->data[nr].addr);
 542                 dma_sync_single_for_cpu(priv->ddev, dma, frag_info->frag_size,
 543                                         DMA_FROM_DEVICE);
 544
 545                 /* Save page reference in skb */
 546                 __skb_frag_set_page(&skb_frags_rx[nr], frags[nr].page);
 547                 skb_frag_size_set(&skb_frags_rx[nr], frag_info->frag_size);
 548                 skb_frags_rx[nr].page_offset = frags[nr].page_offset;
 549                 skb->truesize += frag_info->frag_stride;
 550                 frags[nr].page = NULL;
 551         }
 552         /* Adjust size of last fragment to match actual length */
 553         if (nr > 0)
 554                 skb_frag_size_set(&skb_frags_rx[nr - 1],
 555                         length - priv->frag_info[nr - 1].frag_prefix_size);
 556         return nr;
 557
 558 fail:
 559         while (nr > 0) {
 560                 nr--;
 561                 __skb_frag_unref(&skb_frags_rx[nr]);
 562         }
 563         return 0;
 564 }
 565
 566
 567 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
 568                                       struct mlx4_en_rx_desc *rx_desc,
 569                                       struct mlx4_en_rx_alloc *frags,
 570                                       unsigned int length)
 571 {
 572         struct sk_buff *skb;
 573         void *va;
 574         int used_frags;
 575         dma_addr_t dma;
 576
 577         skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
 578         if (!skb) {
 579                 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
 580                 return NULL;
 581         }
 582         skb_reserve(skb, NET_IP_ALIGN);
 583         skb->len = length;
 584
 585         /* Get pointer to first fragment so we could copy the headers into the
 586          * (linear part of the) skb */
 587         va = page_address(frags[0].page) + frags[0].page_offset;
 588
 589         if (length <= SMALL_PACKET_SIZE) {
 590                 /* We are copying all relevant data to the skb - temporarily
 591                  * sync buffers for the copy */
 592                 dma = be64_to_cpu(rx_desc->data[0].addr);
 593                 dma_sync_single_for_cpu(priv->ddev, dma, length,
 594                                         DMA_FROM_DEVICE);
 595                 skb_copy_to_linear_data(skb, va, length);
 596                 skb->tail += length;
 597         } else {
 598                 unsigned int pull_len;
 599
 600                 /* Move relevant fragments to skb */
 601                 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, frags,
 602                                                         skb, length);
 603                 if (unlikely(!used_frags)) {
 604                         kfree_skb(skb);
 605                         return NULL;
 606                 }
 607                 skb_shinfo(skb)->nr_frags = used_frags;
 608
 609                 pull_len = eth_get_headlen(va, SMALL_PACKET_SIZE);
 610                 /* Copy headers into the skb linear buffer */
 611                 memcpy(skb->data, va, pull_len);
 612                 skb->tail += pull_len;
 613
 614                 /* Skip headers in first fragment */
 615                 skb_shinfo(skb)->frags[0].page_offset += pull_len;
 616
 617                 /* Adjust size of first fragment */
 618                 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], pull_len);
 619                 skb->data_len = length - pull_len;
 620         }
 621         return skb;
 622 }
 623
 624 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
 625 {
 626         int i;
 627         int offset = ETH_HLEN;
 628
 629         for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
 630                 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
 631                         goto out_loopback;
 632         }
 633         /* Loopback found */
 634         priv->loopback_ok = 1;
 635
 636 out_loopback:
 637         dev_kfree_skb_any(skb);
 638 }
 639
 640 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
 641                                      struct mlx4_en_rx_ring *ring)
 642 {
 643         int index = ring->prod & ring->size_mask;
 644
 645         while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
 646                 if (mlx4_en_prepare_rx_desc(priv, ring, index,
 647                                             GFP_ATOMIC | __GFP_COLD))
 648                         break;
 649                 ring->prod++;
 650                 index = ring->prod & ring->size_mask;
 651         }
 652 }
 653
 654 /* When hardware doesn't strip the vlan, we need to calculate the checksum
 655  * over it and add it to the hardware's checksum calculation
 656  */
 657 static inline __wsum get_fixed_vlan_csum(__wsum hw_checksum,
 658                                          struct vlan_hdr *vlanh)
 659 {
 660         return csum_add(hw_checksum, *(__wsum *)vlanh);
 661 }
 662
 663 /* Although the stack expects checksum which doesn't include the pseudo
 664  * header, the HW adds it. To address that, we are subtracting the pseudo
 665  * header checksum from the checksum value provided by the HW.
 666  */
 667 static void get_fixed_ipv4_csum(__wsum hw_checksum, struct sk_buff *skb,
 668                                 struct iphdr *iph)
 669 {
 670         __u16 length_for_csum = 0;
 671         __wsum csum_pseudo_header = 0;
 672
 673         length_for_csum = (be16_to_cpu(iph->tot_len) - (iph->ihl << 2));
 674         csum_pseudo_header = csum_tcpudp_nofold(iph->saddr, iph->daddr,
 675                                                 length_for_csum, iph->protocol, 0);
 676         skb->csum = csum_sub(hw_checksum, csum_pseudo_header);
 677 }
 678
 679 #if IS_ENABLED(CONFIG_IPV6)
 680 /* In IPv6 packets, besides subtracting the pseudo header checksum,
 681  * we also compute/add the IP header checksum which
 682  * is not added by the HW.
 683  */
 684 static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
 685                                struct ipv6hdr *ipv6h)
 686 {
 687         __wsum csum_pseudo_hdr = 0;
 688
 689         if (ipv6h->nexthdr == IPPROTO_FRAGMENT || ipv6h->nexthdr == IPPROTO_HOPOPTS)
 690                 return -1;
 691         hw_checksum = csum_add(hw_checksum, (__force __wsum)(ipv6h->nexthdr << 8));
 692
 693         csum_pseudo_hdr = csum_partial(&ipv6h->saddr,
 694                                        sizeof(ipv6h->saddr) + sizeof(ipv6h->daddr), 0);
 695         csum_pseudo_hdr = csum_add(csum_pseudo_hdr, (__force __wsum)ipv6h->payload_len);
 696         csum_pseudo_hdr = csum_add(csum_pseudo_hdr, (__force __wsum)ntohs(ipv6h->nexthdr));
 697
 698         skb->csum = csum_sub(hw_checksum, csum_pseudo_hdr);
 699         skb->csum = csum_add(skb->csum, csum_partial(ipv6h, sizeof(struct ipv6hdr), 0));
 700         return 0;
 701 }
 702 #endif
 703 static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
 704                       int hwtstamp_rx_filter)
 705 {
 706         __wsum hw_checksum = 0;
 707
 708         void *hdr = (u8 *)va + sizeof(struct ethhdr);
 709
 710         hw_checksum = csum_unfold((__force __sum16)cqe->checksum);
 711
 712         if (((struct ethhdr *)va)->h_proto == htons(ETH_P_8021Q) &&
 713             hwtstamp_rx_filter != HWTSTAMP_FILTER_NONE) {
 714                 /* next protocol non IPv4 or IPv6 */
 715                 if (((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
 716                     != htons(ETH_P_IP) &&
 717                     ((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
 718                     != htons(ETH_P_IPV6))
 719                         return -1;
 720                 hw_checksum = get_fixed_vlan_csum(hw_checksum, hdr);
 721                 hdr += sizeof(struct vlan_hdr);
 722         }
 723
 724         if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4))
 725                 get_fixed_ipv4_csum(hw_checksum, skb, hdr);
 726 #if IS_ENABLED(CONFIG_IPV6)
 727         else if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV6))
 728                 if (get_fixed_ipv6_csum(hw_checksum, skb, hdr))
 729                         return -1;
 730 #endif
 731         return 0;
 732 }
 733
 734 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 735 {
 736         struct mlx4_en_priv *priv = netdev_priv(dev);
 737         struct mlx4_en_dev *mdev = priv->mdev;
 738         struct mlx4_cqe *cqe;
 739         struct mlx4_en_rx_ring *ring = priv->rx_ring[cq->ring];
 740         struct mlx4_en_rx_alloc *frags;
 741         struct mlx4_en_rx_desc *rx_desc;
 742         struct sk_buff *skb;
 743         int index;
 744         int nr;
 745         unsigned int length;
 746         int polled = 0;
 747         int ip_summed;
 748         int factor = priv->cqe_factor;
 749         u64 timestamp;
 750         bool l2_tunnel;
 751
 752         if (!priv->port_up)
 753                 return 0;
 754
 755         if (budget <= 0)
 756                 return polled;
 757
 758         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 759          * descriptor offset can be deduced from the CQE index instead of
 760          * reading 'cqe->index' */
 761         index = cq->mcq.cons_index & ring->size_mask;
 762         cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
 763
 764         /* Process all completed CQEs */
 765         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 766                     cq->mcq.cons_index & cq->size)) {
 767
 768                 frags = ring->rx_info + (index << priv->log_rx_info);
 769                 rx_desc = ring->buf + (index << ring->log_stride);
 770
 771                 /*
 772                  * make sure we read the CQE after we read the ownership bit
 773                  */
 774                 dma_rmb();
 775
 776                 /* Drop packet on bad receive or bad checksum */
 777                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 778                                                 MLX4_CQE_OPCODE_ERROR)) {
 779                         en_err(priv, "CQE completed in error - vendor syndrom:%d syndrom:%d\n",
 780                                ((struct mlx4_err_cqe *)cqe)->vendor_err_syndrome,
 781                                ((struct mlx4_err_cqe *)cqe)->syndrome);
 782                         goto next;
 783                 }
 784                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 785                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 786                         goto next;
 787                 }
 788
 789                 /* Check if we need to drop the packet if SRIOV is not enabled
 790                  * and not performing the selftest or flb disabled
 791                  */
 792                 if (priv->flags & MLX4_EN_FLAG_RX_FILTER_NEEDED) {
 793                         struct ethhdr *ethh;
 794                         dma_addr_t dma;
 795                         /* Get pointer to first fragment since we haven't
 796                          * skb yet and cast it to ethhdr struct
 797                          */
 798                         dma = be64_to_cpu(rx_desc->data[0].addr);
 799                         dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
 800                                                 DMA_FROM_DEVICE);
 801                         ethh = (struct ethhdr *)(page_address(frags[0].page) +
 802                                                  frags[0].page_offset);
 803
 804                         if (is_multicast_ether_addr(ethh->h_dest)) {
 805                                 struct mlx4_mac_entry *entry;
 806                                 struct hlist_head *bucket;
 807                                 unsigned int mac_hash;
 808
 809                                 /* Drop the packet, since HW loopback-ed it */
 810                                 mac_hash = ethh->h_source[MLX4_EN_MAC_HASH_IDX];
 811                                 bucket = &priv->mac_hash[mac_hash];
 812                                 rcu_read_lock();
 813                                 hlist_for_each_entry_rcu(entry, bucket, hlist) {
 814                                         if (ether_addr_equal_64bits(entry->mac,
 815                                                                     ethh->h_source)) {
 816                                                 rcu_read_unlock();
 817                                                 goto next;
 818                                         }
 819                                 }
 820                                 rcu_read_unlock();
 821                         }
 822                 }
 823
 824                 /*
 825                  * Packet is OK - process it.
 826                  */
 827                 length = be32_to_cpu(cqe->byte_cnt);
 828                 length -= ring->fcs_del;
 829                 ring->bytes += length;
 830                 ring->packets++;
 831                 l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
 832                         (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
 833
 834                 if (likely(dev->features & NETIF_F_RXCSUM)) {
 835                         if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
 836                                                       MLX4_CQE_STATUS_UDP)) {
 837                                 if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 838                                     cqe->checksum == cpu_to_be16(0xffff)) {
 839                                         ip_summed = CHECKSUM_UNNECESSARY;
 840                                         ring->csum_ok++;
 841                                 } else {
 842                                         ip_summed = CHECKSUM_NONE;
 843                                         ring->csum_none++;
 844                                 }
 845                         } else {
 846                                 if (priv->flags & MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
 847                                     (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4 |
 848                                                                MLX4_CQE_STATUS_IPV6))) {
 849                                         ip_summed = CHECKSUM_COMPLETE;
 850                                         ring->csum_complete++;
 851                                 } else {
 852                                         ip_summed = CHECKSUM_NONE;
 853                                         ring->csum_none++;
 854                                 }
 855                         }
 856                 } else {
 857                         ip_summed = CHECKSUM_NONE;
 858                         ring->csum_none++;
 859                 }
 860
 861                 /* This packet is eligible for GRO if it is:
 862                  * - DIX Ethernet (type interpretation)
 863                  * - TCP/IP (v4)
 864                  * - without IP options
 865                  * - not an IP fragment
 866                  * - no LLS polling in progress
 867                  */
 868                 if (!mlx4_en_cq_busy_polling(cq) &&
 869                     (dev->features & NETIF_F_GRO)) {
 870                         struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
 871                         if (!gro_skb)
 872                                 goto next;
 873
 874                         nr = mlx4_en_complete_rx_desc(priv,
 875                                 rx_desc, frags, gro_skb,
 876                                 length);
 877                         if (!nr)
 878                                 goto next;
 879
 880                         if (ip_summed == CHECKSUM_COMPLETE) {
 881                                 void *va = skb_frag_address(skb_shinfo(gro_skb)->frags);
 882                                 if (check_csum(cqe, gro_skb, va, ring->hwtstamp_rx_filter)) {
 883                                         ip_summed = CHECKSUM_NONE;
 884                                         ring->csum_none++;
 885                                         ring->csum_complete--;
 886                                 }
 887                         }
 888
 889                         skb_shinfo(gro_skb)->nr_frags = nr;
 890                         gro_skb->len = length;
 891                         gro_skb->data_len = length;
 892                         gro_skb->ip_summed = ip_summed;
 893
 894                         if (l2_tunnel && ip_summed == CHECKSUM_UNNECESSARY)
 895                                 gro_skb->csum_level = 1;
 896
 897                         if ((cqe->vlan_my_qpn &
 898                             cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) &&
 899                             (dev->features & NETIF_F_HW_VLAN_CTAG_RX)) {
 900                                 u16 vid = be16_to_cpu(cqe->sl_vid);
 901
 902                                 __vlan_hwaccel_put_tag(gro_skb, htons(ETH_P_8021Q), vid);
 903                         }
 904
 905                         if (dev->features & NETIF_F_RXHASH)
 906                                 skb_set_hash(gro_skb,
 907                                              be32_to_cpu(cqe->immed_rss_invalid),
 908                                              PKT_HASH_TYPE_L3);
 909
 910                         skb_record_rx_queue(gro_skb, cq->ring);
 911                         skb_mark_napi_id(gro_skb, &cq->napi);
 912
 913                         if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
 914                                 timestamp = mlx4_en_get_cqe_ts(cqe);
 915                                 mlx4_en_fill_hwtstamps(mdev,
 916                                                        skb_hwtstamps(gro_skb),
 917                                                        timestamp);
 918                         }
 919
 920                         napi_gro_frags(&cq->napi);
 921                         goto next;
 922                 }
 923
 924                 /* GRO not possible, complete processing here */
 925                 skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
 926                 if (!skb) {
 927                         priv->stats.rx_dropped++;
 928                         goto next;
 929                 }
 930
 931                 if (unlikely(priv->validate_loopback)) {
 932                         validate_loopback(priv, skb);
 933                         goto next;
 934                 }
 935
 936                 if (ip_summed == CHECKSUM_COMPLETE) {
 937                         if (check_csum(cqe, skb, skb->data, ring->hwtstamp_rx_filter)) {
 938                                 ip_summed = CHECKSUM_NONE;
 939                                 ring->csum_complete--;
 940                                 ring->csum_none++;
 941                         }
 942                 }
 943
 944                 skb->ip_summed = ip_summed;
 945                 skb->protocol = eth_type_trans(skb, dev);
 946                 skb_record_rx_queue(skb, cq->ring);
 947
 948                 if (l2_tunnel && ip_summed == CHECKSUM_UNNECESSARY)
 949                         skb->csum_level = 1;
 950
 951                 if (dev->features & NETIF_F_RXHASH)
 952                         skb_set_hash(skb,
 953                                      be32_to_cpu(cqe->immed_rss_invalid),
 954                                      PKT_HASH_TYPE_L3);
 955
 956                 if ((be32_to_cpu(cqe->vlan_my_qpn) &
 957                     MLX4_CQE_VLAN_PRESENT_MASK) &&
 958                     (dev->features & NETIF_F_HW_VLAN_CTAG_RX))
 959                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), be16_to_cpu(cqe->sl_vid));
 960
 961                 if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
 962                         timestamp = mlx4_en_get_cqe_ts(cqe);
 963                         mlx4_en_fill_hwtstamps(mdev, skb_hwtstamps(skb),
 964                                                timestamp);
 965                 }
 966
 967                 skb_mark_napi_id(skb, &cq->napi);
 968
 969                 if (!mlx4_en_cq_busy_polling(cq))
 970                         napi_gro_receive(&cq->napi, skb);
 971                 else
 972                         netif_receive_skb(skb);
 973
 974 next:
 975                 for (nr = 0; nr < priv->num_frags; nr++)
 976                         mlx4_en_free_frag(priv, frags, nr);
 977
 978                 ++cq->mcq.cons_index;
 979                 index = (cq->mcq.cons_index) & ring->size_mask;
 980                 cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
 981                 if (++polled == budget)
 982                         goto out;
 983         }
 984
 985 out:
 986         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 987         mlx4_cq_set_ci(&cq->mcq);
 988         wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 989         ring->cons = cq->mcq.cons_index;
 990         mlx4_en_refill_rx_buffers(priv, ring);
 991         mlx4_en_update_rx_prod_db(ring);
 992         return polled;
 993 }
 994
 995
 996 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 997 {
 998         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 999         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
1000
1001         if (likely(priv->port_up))
1002                 napi_schedule_irqoff(&cq->napi);
1003         else
1004                 mlx4_en_arm_cq(priv, cq);
1005 }
1006
1007 /* Rx CQ polling - called by NAPI */
1008 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
1009 {
1010         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
1011         struct net_device *dev = cq->dev;
1012         struct mlx4_en_priv *priv = netdev_priv(dev);
1013         int done;
1014
1015         if (!mlx4_en_cq_lock_napi(cq))
1016                 return budget;
1017
1018         done = mlx4_en_process_rx_cq(dev, cq, budget);
1019
1020         mlx4_en_cq_unlock_napi(cq);
1021
1022         /* If we used up all the quota - we're probably not done yet... */
1023         if (done == budget) {
1024                 int cpu_curr;
1025                 const struct cpumask *aff;
1026
1027                 INC_PERF_COUNTER(priv->pstats.napi_quota);
1028
1029                 cpu_curr = smp_processor_id();
1030                 aff = irq_desc_get_irq_data(cq->irq_desc)->affinity;
1031
1032                 if (likely(cpumask_test_cpu(cpu_curr, aff)))
1033                         return budget;
1034
1035                 /* Current cpu is not according to smp_irq_affinity -
1036                  * probably affinity changed. need to stop this NAPI
1037                  * poll, and restart it on the right CPU
1038                  */
1039                 done = 0;
1040         }
1041         /* Done for now */
1042         napi_complete_done(napi, done);
1043         mlx4_en_arm_cq(priv, cq);
1044         return done;
1045 }
1046
1047 static const int frag_sizes[] = {
1048         FRAG_SZ0,
1049         FRAG_SZ1,
1050         FRAG_SZ2,
1051         FRAG_SZ3
1052 };
1053
1054 void mlx4_en_calc_rx_buf(struct net_device *dev)
1055 {
1056         struct mlx4_en_priv *priv = netdev_priv(dev);
1057         int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN;
1058         int buf_size = 0;
1059         int i = 0;
1060
1061         while (buf_size < eff_mtu) {
1062                 priv->frag_info[i].frag_size =
1063                         (eff_mtu > buf_size + frag_sizes[i]) ?
1064                                 frag_sizes[i] : eff_mtu - buf_size;
1065                 priv->frag_info[i].frag_prefix_size = buf_size;
1066                 priv->frag_info[i].frag_stride =
1067                                 ALIGN(priv->frag_info[i].frag_size,
1068                                       SMP_CACHE_BYTES);
1069                 buf_size += priv->frag_info[i].frag_size;
1070                 i++;
1071         }
1072
1073         priv->num_frags = i;
1074         priv->rx_skb_size = eff_mtu;
1075         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
1076
1077         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d num_frags:%d):\n",
1078                eff_mtu, priv->num_frags);
1079         for (i = 0; i < priv->num_frags; i++) {
1080                 en_err(priv,
1081                        "  frag:%d - size:%d prefix:%d stride:%d\n",
1082                        i,
1083                        priv->frag_info[i].frag_size,
1084                        priv->frag_info[i].frag_prefix_size,
1085                        priv->frag_info[i].frag_stride);
1086         }
1087 }
1088
1089 /* RSS related functions */
1090
1091 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
1092                                  struct mlx4_en_rx_ring *ring,
1093                                  enum mlx4_qp_state *state,
1094                                  struct mlx4_qp *qp)
1095 {
1096         struct mlx4_en_dev *mdev = priv->mdev;
1097         struct mlx4_qp_context *context;
1098         int err = 0;
1099
1100         context = kmalloc(sizeof(*context), GFP_KERNEL);
1101         if (!context)
1102                 return -ENOMEM;
1103
1104         err = mlx4_qp_alloc(mdev->dev, qpn, qp, GFP_KERNEL);
1105         if (err) {
1106                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
1107                 goto out;
1108         }
1109         qp->event = mlx4_en_sqp_event;
1110
1111         memset(context, 0, sizeof *context);
1112         mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
1113                                 qpn, ring->cqn, -1, context);
1114         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
1115
1116         /* Cancel FCS removal if FW allows */
1117         if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
1118                 context->param3 |= cpu_to_be32(1 << 29);
1119                 if (priv->dev->features & NETIF_F_RXFCS)
1120                         ring->fcs_del = 0;
1121                 else
1122                         ring->fcs_del = ETH_FCS_LEN;
1123         } else
1124                 ring->fcs_del = 0;
1125
1126         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
1127         if (err) {
1128                 mlx4_qp_remove(mdev->dev, qp);
1129                 mlx4_qp_free(mdev->dev, qp);
1130         }
1131         mlx4_en_update_rx_prod_db(ring);
1132 out:
1133         kfree(context);
1134         return err;
1135 }
1136
1137 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
1138 {
1139         int err;
1140         u32 qpn;
1141
1142         err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn,
1143                                     MLX4_RESERVE_A0_QP);
1144         if (err) {
1145                 en_err(priv, "Failed reserving drop qpn\n");
1146                 return err;
1147         }
1148         err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp, GFP_KERNEL);
1149         if (err) {
1150                 en_err(priv, "Failed allocating drop qp\n");
1151                 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1152                 return err;
1153         }
1154
1155         return 0;
1156 }
1157
1158 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
1159 {
1160         u32 qpn;
1161
1162         qpn = priv->drop_qp.qpn;
1163         mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
1164         mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
1165         mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1166 }
1167
1168 /* Allocate rx qp's and configure them according to rss map */
1169 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
1170 {
1171         struct mlx4_en_dev *mdev = priv->mdev;
1172         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1173         struct mlx4_qp_context context;
1174         struct mlx4_rss_context *rss_context;
1175         int rss_rings;
1176         void *ptr;
1177         u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
1178                         MLX4_RSS_TCP_IPV6);
1179         int i, qpn;
1180         int err = 0;
1181         int good_qps = 0;
1182
1183         en_dbg(DRV, priv, "Configuring rss steering\n");
1184         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
1185                                     priv->rx_ring_num,
1186                                     &rss_map->base_qpn, 0);
1187         if (err) {
1188                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
1189                 return err;
1190         }
1191
1192         for (i = 0; i < priv->rx_ring_num; i++) {
1193                 qpn = rss_map->base_qpn + i;
1194                 err = mlx4_en_config_rss_qp(priv, qpn, priv->rx_ring[i],
1195                                             &rss_map->state[i],
1196                                             &rss_map->qps[i]);
1197                 if (err)
1198                         goto rss_err;
1199
1200                 ++good_qps;
1201         }
1202
1203         /* Configure RSS indirection qp */
1204         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp, GFP_KERNEL);
1205         if (err) {
1206                 en_err(priv, "Failed to allocate RSS indirection QP\n");
1207                 goto rss_err;
1208         }
1209         rss_map->indir_qp.event = mlx4_en_sqp_event;
1210         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1211                                 priv->rx_ring[0]->cqn, -1, &context);
1212
1213         if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
1214                 rss_rings = priv->rx_ring_num;
1215         else
1216                 rss_rings = priv->prof->rss_rings;
1217
1218         ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
1219                                         + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
1220         rss_context = ptr;
1221         rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
1222                                             (rss_map->base_qpn));
1223         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1224         if (priv->mdev->profile.udp_rss) {
1225                 rss_mask |=  MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
1226                 rss_context->base_qpn_udp = rss_context->default_qpn;
1227         }
1228
1229         if (mdev->dev->caps.tunnel_offload_mode == MLX4_TUNNEL_OFFLOAD_MODE_VXLAN) {
1230                 en_info(priv, "Setting RSS context tunnel type to RSS on inner headers\n");
1231                 rss_mask |= MLX4_RSS_BY_INNER_HEADERS;
1232         }
1233
1234         rss_context->flags = rss_mask;
1235         rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1236         if (priv->rss_hash_fn == ETH_RSS_HASH_XOR) {
1237                 rss_context->hash_fn = MLX4_RSS_HASH_XOR;
1238         } else if (priv->rss_hash_fn == ETH_RSS_HASH_TOP) {
1239                 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1240                 memcpy(rss_context->rss_key, priv->rss_key,
1241                        MLX4_EN_RSS_KEY_SIZE);
1242                 netdev_rss_key_fill(rss_context->rss_key,
1243                                     MLX4_EN_RSS_KEY_SIZE);
1244         } else {
1245                 en_err(priv, "Unknown RSS hash function requested\n");
1246                 err = -EINVAL;
1247                 goto indir_err;
1248         }
1249         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1250                                &rss_map->indir_qp, &rss_map->indir_state);
1251         if (err)
1252                 goto indir_err;
1253
1254         return 0;
1255
1256 indir_err:
1257         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1258                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1259         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1260         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1261 rss_err:
1262         for (i = 0; i < good_qps; i++) {
1263                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1264                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1265                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1266                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1267         }
1268         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1269         return err;
1270 }
1271
1272 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1273 {
1274         struct mlx4_en_dev *mdev = priv->mdev;
1275         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1276         int i;
1277
1278         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1279                        MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1280         mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1281         mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1282
1283         for (i = 0; i < priv->rx_ring_num; i++) {
1284                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1285                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1286                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1287                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1288         }
1289         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1290 }