drivers/net/ethernet/mellanox/mlx4/en

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This source file includes following definitions.
mlx4_alloc_page
mlx4_en_alloc_frags
mlx4_en_free_frag
mlx4_en_init_rx_desc
mlx4_en_prepare_rx_desc
mlx4_en_is_ring_empty
mlx4_en_update_rx_prod_db
mlx4_en_free_rx_desc
mlx4_en_fill_rx_buffers
mlx4_en_free_rx_buf
mlx4_en_set_num_rx_rings
mlx4_en_create_rx_ring
mlx4_en_activate_rx_rings
mlx4_en_recover_from_oom
mlx4_en_rx_recycle
mlx4_en_destroy_rx_ring
mlx4_en_deactivate_rx_ring
mlx4_en_complete_rx_desc
validate_loopback
mlx4_en_refill_rx_buffers
get_fixed_vlan_csum
get_fixed_ipv4_csum
get_fixed_ipv6_csum
check_csum
mlx4_en_process_rx_cq
mlx4_en_rx_irq
mlx4_en_poll_rx_cq
mlx4_en_calc_rx_buf
mlx4_en_config_rss_qp
mlx4_en_create_drop_qp
mlx4_en_destroy_drop_qp
mlx4_en_config_rss_steer
mlx4_en_release_rss_steer
   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/bpf.h>
  35 #include <linux/bpf_trace.h>
  36 #include <linux/mlx4/cq.h>
  37 #include <linux/slab.h>
  38 #include <linux/mlx4/qp.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rculist.h>
  41 #include <linux/if_ether.h>
  42 #include <linux/if_vlan.h>
  43 #include <linux/vmalloc.h>
  44 #include <linux/irq.h>
  45 
  46 #include <net/ip.h>
  47 #if IS_ENABLED(CONFIG_IPV6)
  48 #include <net/ip6_checksum.h>
  49 #endif
  50 
  51 #include "mlx4_en.h"
  52 
  53 static int mlx4_alloc_page(struct mlx4_en_priv *priv,
  54                            struct mlx4_en_rx_alloc *frag,
  55                            gfp_t gfp)
  56 {
  57         struct page *page;
  58         dma_addr_t dma;
  59 
  60         page = alloc_page(gfp);
  61         if (unlikely(!page))
  62                 return -ENOMEM;
  63         dma = dma_map_page(priv->ddev, page, 0, PAGE_SIZE, priv->dma_dir);
  64         if (unlikely(dma_mapping_error(priv->ddev, dma))) {
  65                 __free_page(page);
  66                 return -ENOMEM;
  67         }
  68         frag->page = page;
  69         frag->dma = dma;
  70         frag->page_offset = priv->rx_headroom;
  71         return 0;
  72 }
  73 
  74 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
  75                                struct mlx4_en_rx_ring *ring,
  76                                struct mlx4_en_rx_desc *rx_desc,
  77                                struct mlx4_en_rx_alloc *frags,
  78                                gfp_t gfp)
  79 {
  80         int i;
  81 
  82         for (i = 0; i < priv->num_frags; i++, frags++) {
  83                 if (!frags->page) {
  84                         if (mlx4_alloc_page(priv, frags, gfp))
  85                                 return -ENOMEM;
  86                         ring->rx_alloc_pages++;
  87                 }
  88                 rx_desc->data[i].addr = cpu_to_be64(frags->dma +
  89                                                     frags->page_offset);
  90         }
  91         return 0;
  92 }
  93 
  94 static void mlx4_en_free_frag(const struct mlx4_en_priv *priv,
  95                               struct mlx4_en_rx_alloc *frag)
  96 {
  97         if (frag->page) {
  98                 dma_unmap_page(priv->ddev, frag->dma,
  99                                PAGE_SIZE, priv->dma_dir);
 100                 __free_page(frag->page);
 101         }
 102         /* We need to clear all fields, otherwise a change of priv->log_rx_info
 103          * could lead to see garbage later in frag->page.
 104          */
 105         memset(frag, 0, sizeof(*frag));
 106 }
 107 
 108 static void mlx4_en_init_rx_desc(const struct mlx4_en_priv *priv,
 109                                  struct mlx4_en_rx_ring *ring, int index)
 110 {
 111         struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
 112         int possible_frags;
 113         int i;
 114 
 115         /* Set size and memtype fields */
 116         for (i = 0; i < priv->num_frags; i++) {
 117                 rx_desc->data[i].byte_count =
 118                         cpu_to_be32(priv->frag_info[i].frag_size);
 119                 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
 120         }
 121 
 122         /* If the number of used fragments does not fill up the ring stride,
 123          * remaining (unused) fragments must be padded with null address/size
 124          * and a special memory key */
 125         possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
 126         for (i = priv->num_frags; i < possible_frags; i++) {
 127                 rx_desc->data[i].byte_count = 0;
 128                 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
 129                 rx_desc->data[i].addr = 0;
 130         }
 131 }
 132 
 133 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 134                                    struct mlx4_en_rx_ring *ring, int index,
 135                                    gfp_t gfp)
 136 {
 137         struct mlx4_en_rx_desc *rx_desc = ring->buf +
 138                 (index << ring->log_stride);
 139         struct mlx4_en_rx_alloc *frags = ring->rx_info +
 140                                         (index << priv->log_rx_info);
 141         if (likely(ring->page_cache.index > 0)) {
 142                 /* XDP uses a single page per frame */
 143                 if (!frags->page) {
 144                         ring->page_cache.index--;
 145                         frags->page = ring->page_cache.buf[ring->page_cache.index].page;
 146                         frags->dma  = ring->page_cache.buf[ring->page_cache.index].dma;
 147                 }
 148                 frags->page_offset = XDP_PACKET_HEADROOM;
 149                 rx_desc->data[0].addr = cpu_to_be64(frags->dma +
 150                                                     XDP_PACKET_HEADROOM);
 151                 return 0;
 152         }
 153 
 154         return mlx4_en_alloc_frags(priv, ring, rx_desc, frags, gfp);
 155 }
 156 
 157 static bool mlx4_en_is_ring_empty(const struct mlx4_en_rx_ring *ring)
 158 {
 159         return ring->prod == ring->cons;
 160 }
 161 
 162 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
 163 {
 164         *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
 165 }
 166 
 167 /* slow path */
 168 static void mlx4_en_free_rx_desc(const struct mlx4_en_priv *priv,
 169                                  struct mlx4_en_rx_ring *ring,
 170                                  int index)
 171 {
 172         struct mlx4_en_rx_alloc *frags;
 173         int nr;
 174 
 175         frags = ring->rx_info + (index << priv->log_rx_info);
 176         for (nr = 0; nr < priv->num_frags; nr++) {
 177                 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
 178                 mlx4_en_free_frag(priv, frags + nr);
 179         }
 180 }
 181 
 182 /* Function not in fast-path */
 183 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
 184 {
 185         struct mlx4_en_rx_ring *ring;
 186         int ring_ind;
 187         int buf_ind;
 188         int new_size;
 189 
 190         for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
 191                 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 192                         ring = priv->rx_ring[ring_ind];
 193 
 194                         if (mlx4_en_prepare_rx_desc(priv, ring,
 195                                                     ring->actual_size,
 196                                                     GFP_KERNEL)) {
 197                                 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
 198                                         en_err(priv, "Failed to allocate enough rx buffers\n");
 199                                         return -ENOMEM;
 200                                 } else {
 201                                         new_size = rounddown_pow_of_two(ring->actual_size);
 202                                         en_warn(priv, "Only %d buffers allocated reducing ring size to %d\n",
 203                                                 ring->actual_size, new_size);
 204                                         goto reduce_rings;
 205                                 }
 206                         }
 207                         ring->actual_size++;
 208                         ring->prod++;
 209                 }
 210         }
 211         return 0;
 212 
 213 reduce_rings:
 214         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 215                 ring = priv->rx_ring[ring_ind];
 216                 while (ring->actual_size > new_size) {
 217                         ring->actual_size--;
 218                         ring->prod--;
 219                         mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
 220                 }
 221         }
 222 
 223         return 0;
 224 }
 225 
 226 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
 227                                 struct mlx4_en_rx_ring *ring)
 228 {
 229         int index;
 230 
 231         en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
 232                ring->cons, ring->prod);
 233 
 234         /* Unmap and free Rx buffers */
 235         for (index = 0; index < ring->size; index++) {
 236                 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
 237                 mlx4_en_free_rx_desc(priv, ring, index);
 238         }
 239         ring->cons = 0;
 240         ring->prod = 0;
 241 }
 242 
 243 void mlx4_en_set_num_rx_rings(struct mlx4_en_dev *mdev)
 244 {
 245         int i;
 246         int num_of_eqs;
 247         int num_rx_rings;
 248         struct mlx4_dev *dev = mdev->dev;
 249 
 250         mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
 251                 num_of_eqs = max_t(int, MIN_RX_RINGS,
 252                                    min_t(int,
 253                                          mlx4_get_eqs_per_port(mdev->dev, i),
 254                                          DEF_RX_RINGS));
 255 
 256                 num_rx_rings = mlx4_low_memory_profile() ? MIN_RX_RINGS :
 257                         min_t(int, num_of_eqs, num_online_cpus());
 258                 mdev->profile.prof[i].rx_ring_num =
 259                         rounddown_pow_of_two(num_rx_rings);
 260         }
 261 }
 262 
 263 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
 264                            struct mlx4_en_rx_ring **pring,
 265                            u32 size, u16 stride, int node, int queue_index)
 266 {
 267         struct mlx4_en_dev *mdev = priv->mdev;
 268         struct mlx4_en_rx_ring *ring;
 269         int err = -ENOMEM;
 270         int tmp;
 271 
 272         ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
 273         if (!ring) {
 274                 en_err(priv, "Failed to allocate RX ring structure\n");
 275                 return -ENOMEM;
 276         }
 277 
 278         ring->prod = 0;
 279         ring->cons = 0;
 280         ring->size = size;
 281         ring->size_mask = size - 1;
 282         ring->stride = stride;
 283         ring->log_stride = ffs(ring->stride) - 1;
 284         ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
 285 
 286         if (xdp_rxq_info_reg(&ring->xdp_rxq, priv->dev, queue_index) < 0)
 287                 goto err_ring;
 288 
 289         tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
 290                                         sizeof(struct mlx4_en_rx_alloc));
 291         ring->rx_info = kvzalloc_node(tmp, GFP_KERNEL, node);
 292         if (!ring->rx_info) {
 293                 err = -ENOMEM;
 294                 goto err_xdp_info;
 295         }
 296 
 297         en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
 298                  ring->rx_info, tmp);
 299 
 300         /* Allocate HW buffers on provided NUMA node */
 301         set_dev_node(&mdev->dev->persist->pdev->dev, node);
 302         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 303         set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
 304         if (err)
 305                 goto err_info;
 306 
 307         ring->buf = ring->wqres.buf.direct.buf;
 308 
 309         ring->hwtstamp_rx_filter = priv->hwtstamp_config.rx_filter;
 310 
 311         *pring = ring;
 312         return 0;
 313 
 314 err_info:
 315         kvfree(ring->rx_info);
 316         ring->rx_info = NULL;
 317 err_xdp_info:
 318         xdp_rxq_info_unreg(&ring->xdp_rxq);
 319 err_ring:
 320         kfree(ring);
 321         *pring = NULL;
 322 
 323         return err;
 324 }
 325 
 326 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
 327 {
 328         struct mlx4_en_rx_ring *ring;
 329         int i;
 330         int ring_ind;
 331         int err;
 332         int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
 333                                         DS_SIZE * priv->num_frags);
 334 
 335         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 336                 ring = priv->rx_ring[ring_ind];
 337 
 338                 ring->prod = 0;
 339                 ring->cons = 0;
 340                 ring->actual_size = 0;
 341                 ring->cqn = priv->rx_cq[ring_ind]->mcq.cqn;
 342 
 343                 ring->stride = stride;
 344                 if (ring->stride <= TXBB_SIZE) {
 345                         /* Stamp first unused send wqe */
 346                         __be32 *ptr = (__be32 *)ring->buf;
 347                         __be32 stamp = cpu_to_be32(1 << STAMP_SHIFT);
 348                         *ptr = stamp;
 349                         /* Move pointer to start of rx section */
 350                         ring->buf += TXBB_SIZE;
 351                 }
 352 
 353                 ring->log_stride = ffs(ring->stride) - 1;
 354                 ring->buf_size = ring->size * ring->stride;
 355 
 356                 memset(ring->buf, 0, ring->buf_size);
 357                 mlx4_en_update_rx_prod_db(ring);
 358 
 359                 /* Initialize all descriptors */
 360                 for (i = 0; i < ring->size; i++)
 361                         mlx4_en_init_rx_desc(priv, ring, i);
 362         }
 363         err = mlx4_en_fill_rx_buffers(priv);
 364         if (err)
 365                 goto err_buffers;
 366 
 367         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
 368                 ring = priv->rx_ring[ring_ind];
 369 
 370                 ring->size_mask = ring->actual_size - 1;
 371                 mlx4_en_update_rx_prod_db(ring);
 372         }
 373 
 374         return 0;
 375 
 376 err_buffers:
 377         for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
 378                 mlx4_en_free_rx_buf(priv, priv->rx_ring[ring_ind]);
 379 
 380         ring_ind = priv->rx_ring_num - 1;
 381         while (ring_ind >= 0) {
 382                 if (priv->rx_ring[ring_ind]->stride <= TXBB_SIZE)
 383                         priv->rx_ring[ring_ind]->buf -= TXBB_SIZE;
 384                 ring_ind--;
 385         }
 386         return err;
 387 }
 388 
 389 /* We recover from out of memory by scheduling our napi poll
 390  * function (mlx4_en_process_cq), which tries to allocate
 391  * all missing RX buffers (call to mlx4_en_refill_rx_buffers).
 392  */
 393 void mlx4_en_recover_from_oom(struct mlx4_en_priv *priv)
 394 {
 395         int ring;
 396 
 397         if (!priv->port_up)
 398                 return;
 399 
 400         for (ring = 0; ring < priv->rx_ring_num; ring++) {
 401                 if (mlx4_en_is_ring_empty(priv->rx_ring[ring])) {
 402                         local_bh_disable();
 403                         napi_reschedule(&priv->rx_cq[ring]->napi);
 404                         local_bh_enable();
 405                 }
 406         }
 407 }
 408 
 409 /* When the rx ring is running in page-per-packet mode, a released frame can go
 410  * directly into a small cache, to avoid unmapping or touching the page
 411  * allocator. In bpf prog performance scenarios, buffers are either forwarded
 412  * or dropped, never converted to skbs, so every page can come directly from
 413  * this cache when it is sized to be a multiple of the napi budget.
 414  */
 415 bool mlx4_en_rx_recycle(struct mlx4_en_rx_ring *ring,
 416                         struct mlx4_en_rx_alloc *frame)
 417 {
 418         struct mlx4_en_page_cache *cache = &ring->page_cache;
 419 
 420         if (cache->index >= MLX4_EN_CACHE_SIZE)
 421                 return false;
 422 
 423         cache->buf[cache->index].page = frame->page;
 424         cache->buf[cache->index].dma = frame->dma;
 425         cache->index++;
 426         return true;
 427 }
 428 
 429 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
 430                              struct mlx4_en_rx_ring **pring,
 431                              u32 size, u16 stride)
 432 {
 433         struct mlx4_en_dev *mdev = priv->mdev;
 434         struct mlx4_en_rx_ring *ring = *pring;
 435         struct bpf_prog *old_prog;
 436 
 437         old_prog = rcu_dereference_protected(
 438                                         ring->xdp_prog,
 439                                         lockdep_is_held(&mdev->state_lock));
 440         if (old_prog)
 441                 bpf_prog_put(old_prog);
 442         xdp_rxq_info_unreg(&ring->xdp_rxq);
 443         mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
 444         kvfree(ring->rx_info);
 445         ring->rx_info = NULL;
 446         kfree(ring);
 447         *pring = NULL;
 448 }
 449 
 450 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
 451                                 struct mlx4_en_rx_ring *ring)
 452 {
 453         int i;
 454 
 455         for (i = 0; i < ring->page_cache.index; i++) {
 456                 dma_unmap_page(priv->ddev, ring->page_cache.buf[i].dma,
 457                                PAGE_SIZE, priv->dma_dir);
 458                 put_page(ring->page_cache.buf[i].page);
 459         }
 460         ring->page_cache.index = 0;
 461         mlx4_en_free_rx_buf(priv, ring);
 462         if (ring->stride <= TXBB_SIZE)
 463                 ring->buf -= TXBB_SIZE;
 464 }
 465 
 466 
 467 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
 468                                     struct mlx4_en_rx_alloc *frags,
 469                                     struct sk_buff *skb,
 470                                     int length)
 471 {
 472         const struct mlx4_en_frag_info *frag_info = priv->frag_info;
 473         unsigned int truesize = 0;
 474         bool release = true;
 475         int nr, frag_size;
 476         struct page *page;
 477         dma_addr_t dma;
 478 
 479         /* Collect used fragments while replacing them in the HW descriptors */
 480         for (nr = 0;; frags++) {
 481                 frag_size = min_t(int, length, frag_info->frag_size);
 482 
 483                 page = frags->page;
 484                 if (unlikely(!page))
 485                         goto fail;
 486 
 487                 dma = frags->dma;
 488                 dma_sync_single_range_for_cpu(priv->ddev, dma, frags->page_offset,
 489                                               frag_size, priv->dma_dir);
 490 
 491                 __skb_fill_page_desc(skb, nr, page, frags->page_offset,
 492                                      frag_size);
 493 
 494                 truesize += frag_info->frag_stride;
 495                 if (frag_info->frag_stride == PAGE_SIZE / 2) {
 496                         frags->page_offset ^= PAGE_SIZE / 2;
 497                         release = page_count(page) != 1 ||
 498                                   page_is_pfmemalloc(page) ||
 499                                   page_to_nid(page) != numa_mem_id();
 500                 } else if (!priv->rx_headroom) {
 501                         /* rx_headroom for non XDP setup is always 0.
 502                          * When XDP is set, the above condition will
 503                          * guarantee page is always released.
 504                          */
 505                         u32 sz_align = ALIGN(frag_size, SMP_CACHE_BYTES);
 506 
 507                         frags->page_offset += sz_align;
 508                         release = frags->page_offset + frag_info->frag_size > PAGE_SIZE;
 509                 }
 510                 if (release) {
 511                         dma_unmap_page(priv->ddev, dma, PAGE_SIZE, priv->dma_dir);
 512                         frags->page = NULL;
 513                 } else {
 514                         page_ref_inc(page);
 515                 }
 516 
 517                 nr++;
 518                 length -= frag_size;
 519                 if (!length)
 520                         break;
 521                 frag_info++;
 522         }
 523         skb->truesize += truesize;
 524         return nr;
 525 
 526 fail:
 527         while (nr > 0) {
 528                 nr--;
 529                 __skb_frag_unref(skb_shinfo(skb)->frags + nr);
 530         }
 531         return 0;
 532 }
 533 
 534 static void validate_loopback(struct mlx4_en_priv *priv, void *va)
 535 {
 536         const unsigned char *data = va + ETH_HLEN;
 537         int i;
 538 
 539         for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++) {
 540                 if (data[i] != (unsigned char)i)
 541                         return;
 542         }
 543         /* Loopback found */
 544         priv->loopback_ok = 1;
 545 }
 546 
 547 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
 548                                       struct mlx4_en_rx_ring *ring)
 549 {
 550         u32 missing = ring->actual_size - (ring->prod - ring->cons);
 551 
 552         /* Try to batch allocations, but not too much. */
 553         if (missing < 8)
 554                 return;
 555         do {
 556                 if (mlx4_en_prepare_rx_desc(priv, ring,
 557                                             ring->prod & ring->size_mask,
 558                                             GFP_ATOMIC | __GFP_MEMALLOC))
 559                         break;
 560                 ring->prod++;
 561         } while (likely(--missing));
 562 
 563         mlx4_en_update_rx_prod_db(ring);
 564 }
 565 
 566 /* When hardware doesn't strip the vlan, we need to calculate the checksum
 567  * over it and add it to the hardware's checksum calculation
 568  */
 569 static inline __wsum get_fixed_vlan_csum(__wsum hw_checksum,
 570                                          struct vlan_hdr *vlanh)
 571 {
 572         return csum_add(hw_checksum, *(__wsum *)vlanh);
 573 }
 574 
 575 /* Although the stack expects checksum which doesn't include the pseudo
 576  * header, the HW adds it. To address that, we are subtracting the pseudo
 577  * header checksum from the checksum value provided by the HW.
 578  */
 579 static int get_fixed_ipv4_csum(__wsum hw_checksum, struct sk_buff *skb,
 580                                struct iphdr *iph)
 581 {
 582         __u16 length_for_csum = 0;
 583         __wsum csum_pseudo_header = 0;
 584         __u8 ipproto = iph->protocol;
 585 
 586         if (unlikely(ipproto == IPPROTO_SCTP))
 587                 return -1;
 588 
 589         length_for_csum = (be16_to_cpu(iph->tot_len) - (iph->ihl << 2));
 590         csum_pseudo_header = csum_tcpudp_nofold(iph->saddr, iph->daddr,
 591                                                 length_for_csum, ipproto, 0);
 592         skb->csum = csum_sub(hw_checksum, csum_pseudo_header);
 593         return 0;
 594 }
 595 
 596 #if IS_ENABLED(CONFIG_IPV6)
 597 /* In IPv6 packets, hw_checksum lacks 6 bytes from IPv6 header:
 598  * 4 first bytes : priority, version, flow_lbl
 599  * and 2 additional bytes : nexthdr, hop_limit.
 600  */
 601 static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
 602                                struct ipv6hdr *ipv6h)
 603 {
 604         __u8 nexthdr = ipv6h->nexthdr;
 605         __wsum temp;
 606 
 607         if (unlikely(nexthdr == IPPROTO_FRAGMENT ||
 608                      nexthdr == IPPROTO_HOPOPTS ||
 609                      nexthdr == IPPROTO_SCTP))
 610                 return -1;
 611 
 612         /* priority, version, flow_lbl */
 613         temp = csum_add(hw_checksum, *(__wsum *)ipv6h);
 614         /* nexthdr and hop_limit */
 615         skb->csum = csum_add(temp, (__force __wsum)*(__be16 *)&ipv6h->nexthdr);
 616         return 0;
 617 }
 618 #endif
 619 
 620 #define short_frame(size) ((size) <= ETH_ZLEN + ETH_FCS_LEN)
 621 
 622 /* We reach this function only after checking that any of
 623  * the (IPv4 | IPv6) bits are set in cqe->status.
 624  */
 625 static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
 626                       netdev_features_t dev_features)
 627 {
 628         __wsum hw_checksum = 0;
 629         void *hdr;
 630 
 631         /* CQE csum doesn't cover padding octets in short ethernet
 632          * frames. And the pad field is appended prior to calculating
 633          * and appending the FCS field.
 634          *
 635          * Detecting these padded frames requires to verify and parse
 636          * IP headers, so we simply force all those small frames to skip
 637          * checksum complete.
 638          */
 639         if (short_frame(skb->len))
 640                 return -EINVAL;
 641 
 642         hdr = (u8 *)va + sizeof(struct ethhdr);
 643         hw_checksum = csum_unfold((__force __sum16)cqe->checksum);
 644 
 645         if (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK) &&
 646             !(dev_features & NETIF_F_HW_VLAN_CTAG_RX)) {
 647                 hw_checksum = get_fixed_vlan_csum(hw_checksum, hdr);
 648                 hdr += sizeof(struct vlan_hdr);
 649         }
 650 
 651 #if IS_ENABLED(CONFIG_IPV6)
 652         if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV6))
 653                 return get_fixed_ipv6_csum(hw_checksum, skb, hdr);
 654 #endif
 655         return get_fixed_ipv4_csum(hw_checksum, skb, hdr);
 656 }
 657 
 658 #if IS_ENABLED(CONFIG_IPV6)
 659 #define MLX4_CQE_STATUS_IP_ANY (MLX4_CQE_STATUS_IPV4 | MLX4_CQE_STATUS_IPV6)
 660 #else
 661 #define MLX4_CQE_STATUS_IP_ANY (MLX4_CQE_STATUS_IPV4)
 662 #endif
 663 
 664 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
 665 {
 666         struct mlx4_en_priv *priv = netdev_priv(dev);
 667         int factor = priv->cqe_factor;
 668         struct mlx4_en_rx_ring *ring;
 669         struct bpf_prog *xdp_prog;
 670         int cq_ring = cq->ring;
 671         bool doorbell_pending;
 672         struct mlx4_cqe *cqe;
 673         struct xdp_buff xdp;
 674         int polled = 0;
 675         int index;
 676 
 677         if (unlikely(!priv->port_up || budget <= 0))
 678                 return 0;
 679 
 680         ring = priv->rx_ring[cq_ring];
 681 
 682         /* Protect accesses to: ring->xdp_prog, priv->mac_hash list */
 683         rcu_read_lock();
 684         xdp_prog = rcu_dereference(ring->xdp_prog);
 685         xdp.rxq = &ring->xdp_rxq;
 686         doorbell_pending = 0;
 687 
 688         /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
 689          * descriptor offset can be deduced from the CQE index instead of
 690          * reading 'cqe->index' */
 691         index = cq->mcq.cons_index & ring->size_mask;
 692         cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
 693 
 694         /* Process all completed CQEs */
 695         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 696                     cq->mcq.cons_index & cq->size)) {
 697                 struct mlx4_en_rx_alloc *frags;
 698                 enum pkt_hash_types hash_type;
 699                 struct sk_buff *skb;
 700                 unsigned int length;
 701                 int ip_summed;
 702                 void *va;
 703                 int nr;
 704 
 705                 frags = ring->rx_info + (index << priv->log_rx_info);
 706                 va = page_address(frags[0].page) + frags[0].page_offset;
 707                 prefetchw(va);
 708                 /*
 709                  * make sure we read the CQE after we read the ownership bit
 710                  */
 711                 dma_rmb();
 712 
 713                 /* Drop packet on bad receive or bad checksum */
 714                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 715                                                 MLX4_CQE_OPCODE_ERROR)) {
 716                         en_err(priv, "CQE completed in error - vendor syndrom:%d syndrom:%d\n",
 717                                ((struct mlx4_err_cqe *)cqe)->vendor_err_syndrome,
 718                                ((struct mlx4_err_cqe *)cqe)->syndrome);
 719                         goto next;
 720                 }
 721                 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
 722                         en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
 723                         goto next;
 724                 }
 725 
 726                 /* Check if we need to drop the packet if SRIOV is not enabled
 727                  * and not performing the selftest or flb disabled
 728                  */
 729                 if (priv->flags & MLX4_EN_FLAG_RX_FILTER_NEEDED) {
 730                         const struct ethhdr *ethh = va;
 731                         dma_addr_t dma;
 732                         /* Get pointer to first fragment since we haven't
 733                          * skb yet and cast it to ethhdr struct
 734                          */
 735                         dma = frags[0].dma + frags[0].page_offset;
 736                         dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
 737                                                 DMA_FROM_DEVICE);
 738 
 739                         if (is_multicast_ether_addr(ethh->h_dest)) {
 740                                 struct mlx4_mac_entry *entry;
 741                                 struct hlist_head *bucket;
 742                                 unsigned int mac_hash;
 743 
 744                                 /* Drop the packet, since HW loopback-ed it */
 745                                 mac_hash = ethh->h_source[MLX4_EN_MAC_HASH_IDX];
 746                                 bucket = &priv->mac_hash[mac_hash];
 747                                 hlist_for_each_entry_rcu(entry, bucket, hlist) {
 748                                         if (ether_addr_equal_64bits(entry->mac,
 749                                                                     ethh->h_source))
 750                                                 goto next;
 751                                 }
 752                         }
 753                 }
 754 
 755                 if (unlikely(priv->validate_loopback)) {
 756                         validate_loopback(priv, va);
 757                         goto next;
 758                 }
 759 
 760                 /*
 761                  * Packet is OK - process it.
 762                  */
 763                 length = be32_to_cpu(cqe->byte_cnt);
 764                 length -= ring->fcs_del;
 765 
 766                 /* A bpf program gets first chance to drop the packet. It may
 767                  * read bytes but not past the end of the frag.
 768                  */
 769                 if (xdp_prog) {
 770                         dma_addr_t dma;
 771                         void *orig_data;
 772                         u32 act;
 773 
 774                         dma = frags[0].dma + frags[0].page_offset;
 775                         dma_sync_single_for_cpu(priv->ddev, dma,
 776                                                 priv->frag_info[0].frag_size,
 777                                                 DMA_FROM_DEVICE);
 778 
 779                         xdp.data_hard_start = va - frags[0].page_offset;
 780                         xdp.data = va;
 781                         xdp_set_data_meta_invalid(&xdp);
 782                         xdp.data_end = xdp.data + length;
 783                         orig_data = xdp.data;
 784 
 785                         act = bpf_prog_run_xdp(xdp_prog, &xdp);
 786 
 787                         length = xdp.data_end - xdp.data;
 788                         if (xdp.data != orig_data) {
 789                                 frags[0].page_offset = xdp.data -
 790                                         xdp.data_hard_start;
 791                                 va = xdp.data;
 792                         }
 793 
 794                         switch (act) {
 795                         case XDP_PASS:
 796                                 break;
 797                         case XDP_TX:
 798                                 if (likely(!mlx4_en_xmit_frame(ring, frags, priv,
 799                                                         length, cq_ring,
 800                                                         &doorbell_pending))) {
 801                                         frags[0].page = NULL;
 802                                         goto next;
 803                                 }
 804                                 trace_xdp_exception(dev, xdp_prog, act);
 805                                 goto xdp_drop_no_cnt; /* Drop on xmit failure */
 806                         default:
 807                                 bpf_warn_invalid_xdp_action(act);
 808                                 /* fall through */
 809                         case XDP_ABORTED:
 810                                 trace_xdp_exception(dev, xdp_prog, act);
 811                                 /* fall through */
 812                         case XDP_DROP:
 813                                 ring->xdp_drop++;
 814 xdp_drop_no_cnt:
 815                                 goto next;
 816                         }
 817                 }
 818 
 819                 ring->bytes += length;
 820                 ring->packets++;
 821 
 822                 skb = napi_get_frags(&cq->napi);
 823                 if (unlikely(!skb))
 824                         goto next;
 825 
 826                 if (unlikely(ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL)) {
 827                         u64 timestamp = mlx4_en_get_cqe_ts(cqe);
 828 
 829                         mlx4_en_fill_hwtstamps(priv->mdev, skb_hwtstamps(skb),
 830                                                timestamp);
 831                 }
 832                 skb_record_rx_queue(skb, cq_ring);
 833 
 834                 if (likely(dev->features & NETIF_F_RXCSUM)) {
 835                         /* TODO: For IP non TCP/UDP packets when csum complete is
 836                          * not an option (not supported or any other reason) we can
 837                          * actually check cqe IPOK status bit and report
 838                          * CHECKSUM_UNNECESSARY rather than CHECKSUM_NONE
 839                          */
 840                         if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
 841                                                        MLX4_CQE_STATUS_UDP)) &&
 842                             (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
 843                             cqe->checksum == cpu_to_be16(0xffff)) {
 844                                 bool l2_tunnel;
 845 
 846                                 l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
 847                                         (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
 848                                 ip_summed = CHECKSUM_UNNECESSARY;
 849                                 hash_type = PKT_HASH_TYPE_L4;
 850                                 if (l2_tunnel)
 851                                         skb->csum_level = 1;
 852                                 ring->csum_ok++;
 853                         } else {
 854                                 if (!(priv->flags & MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
 855                                       (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IP_ANY))))
 856                                         goto csum_none;
 857                                 if (check_csum(cqe, skb, va, dev->features))
 858                                         goto csum_none;
 859                                 ip_summed = CHECKSUM_COMPLETE;
 860                                 hash_type = PKT_HASH_TYPE_L3;
 861                                 ring->csum_complete++;
 862                         }
 863                 } else {
 864 csum_none:
 865                         ip_summed = CHECKSUM_NONE;
 866                         hash_type = PKT_HASH_TYPE_L3;
 867                         ring->csum_none++;
 868                 }
 869                 skb->ip_summed = ip_summed;
 870                 if (dev->features & NETIF_F_RXHASH)
 871                         skb_set_hash(skb,
 872                                      be32_to_cpu(cqe->immed_rss_invalid),
 873                                      hash_type);
 874 
 875                 if ((cqe->vlan_my_qpn &
 876                      cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK)) &&
 877                     (dev->features & NETIF_F_HW_VLAN_CTAG_RX))
 878                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 879                                                be16_to_cpu(cqe->sl_vid));
 880                 else if ((cqe->vlan_my_qpn &
 881                           cpu_to_be32(MLX4_CQE_SVLAN_PRESENT_MASK)) &&
 882                          (dev->features & NETIF_F_HW_VLAN_STAG_RX))
 883                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD),
 884                                                be16_to_cpu(cqe->sl_vid));
 885 
 886                 nr = mlx4_en_complete_rx_desc(priv, frags, skb, length);
 887                 if (likely(nr)) {
 888                         skb_shinfo(skb)->nr_frags = nr;
 889                         skb->len = length;
 890                         skb->data_len = length;
 891                         napi_gro_frags(&cq->napi);
 892                 } else {
 893                         __vlan_hwaccel_clear_tag(skb);
 894                         skb_clear_hash(skb);
 895                 }
 896 next:
 897                 ++cq->mcq.cons_index;
 898                 index = (cq->mcq.cons_index) & ring->size_mask;
 899                 cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
 900                 if (unlikely(++polled == budget))
 901                         break;
 902         }
 903 
 904         rcu_read_unlock();
 905 
 906         if (likely(polled)) {
 907                 if (doorbell_pending) {
 908                         priv->tx_cq[TX_XDP][cq_ring]->xdp_busy = true;
 909                         mlx4_en_xmit_doorbell(priv->tx_ring[TX_XDP][cq_ring]);
 910                 }
 911 
 912                 mlx4_cq_set_ci(&cq->mcq);
 913                 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
 914                 ring->cons = cq->mcq.cons_index;
 915         }
 916         AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
 917 
 918         mlx4_en_refill_rx_buffers(priv, ring);
 919 
 920         return polled;
 921 }
 922 
 923 
 924 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
 925 {
 926         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 927         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 928 
 929         if (likely(priv->port_up))
 930                 napi_schedule_irqoff(&cq->napi);
 931         else
 932                 mlx4_en_arm_cq(priv, cq);
 933 }
 934 
 935 /* Rx CQ polling - called by NAPI */
 936 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
 937 {
 938         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 939         struct net_device *dev = cq->dev;
 940         struct mlx4_en_priv *priv = netdev_priv(dev);
 941         struct mlx4_en_cq *xdp_tx_cq = NULL;
 942         bool clean_complete = true;
 943         int done;
 944 
 945         if (priv->tx_ring_num[TX_XDP]) {
 946                 xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring];
 947                 if (xdp_tx_cq->xdp_busy) {
 948                         clean_complete = mlx4_en_process_tx_cq(dev, xdp_tx_cq,
 949                                                                budget);
 950                         xdp_tx_cq->xdp_busy = !clean_complete;
 951                 }
 952         }
 953 
 954         done = mlx4_en_process_rx_cq(dev, cq, budget);
 955 
 956         /* If we used up all the quota - we're probably not done yet... */
 957         if (done == budget || !clean_complete) {
 958                 const struct cpumask *aff;
 959                 struct irq_data *idata;
 960                 int cpu_curr;
 961 
 962                 /* in case we got here because of !clean_complete */
 963                 done = budget;
 964 
 965                 INC_PERF_COUNTER(priv->pstats.napi_quota);
 966 
 967                 cpu_curr = smp_processor_id();
 968                 idata = irq_desc_get_irq_data(cq->irq_desc);
 969                 aff = irq_data_get_affinity_mask(idata);
 970 
 971                 if (likely(cpumask_test_cpu(cpu_curr, aff)))
 972                         return budget;
 973 
 974                 /* Current cpu is not according to smp_irq_affinity -
 975                  * probably affinity changed. Need to stop this NAPI
 976                  * poll, and restart it on the right CPU.
 977                  * Try to avoid returning a too small value (like 0),
 978                  * to not fool net_rx_action() and its netdev_budget
 979                  */
 980                 if (done)
 981                         done--;
 982         }
 983         /* Done for now */
 984         if (likely(napi_complete_done(napi, done)))
 985                 mlx4_en_arm_cq(priv, cq);
 986         return done;
 987 }
 988 
 989 void mlx4_en_calc_rx_buf(struct net_device *dev)
 990 {
 991         struct mlx4_en_priv *priv = netdev_priv(dev);
 992         int eff_mtu = MLX4_EN_EFF_MTU(dev->mtu);
 993         int i = 0;
 994 
 995         /* bpf requires buffers to be set up as 1 packet per page.
 996          * This only works when num_frags == 1.
 997          */
 998         if (priv->tx_ring_num[TX_XDP]) {
 999                 priv->frag_info[0].frag_size = eff_mtu;
1000                 /* This will gain efficient xdp frame recycling at the
1001                  * expense of more costly truesize accounting
1002                  */
1003                 priv->frag_info[0].frag_stride = PAGE_SIZE;
1004                 priv->dma_dir = PCI_DMA_BIDIRECTIONAL;
1005                 priv->rx_headroom = XDP_PACKET_HEADROOM;
1006                 i = 1;
1007         } else {
1008                 int frag_size_max = 2048, buf_size = 0;
1009 
1010                 /* should not happen, right ? */
1011                 if (eff_mtu > PAGE_SIZE + (MLX4_EN_MAX_RX_FRAGS - 1) * 2048)
1012                         frag_size_max = PAGE_SIZE;
1013 
1014                 while (buf_size < eff_mtu) {
1015                         int frag_stride, frag_size = eff_mtu - buf_size;
1016                         int pad, nb;
1017 
1018                         if (i < MLX4_EN_MAX_RX_FRAGS - 1)
1019                                 frag_size = min(frag_size, frag_size_max);
1020 
1021                         priv->frag_info[i].frag_size = frag_size;
1022                         frag_stride = ALIGN(frag_size, SMP_CACHE_BYTES);
1023                         /* We can only pack 2 1536-bytes frames in on 4K page
1024                          * Therefore, each frame would consume more bytes (truesize)
1025                          */
1026                         nb = PAGE_SIZE / frag_stride;
1027                         pad = (PAGE_SIZE - nb * frag_stride) / nb;
1028                         pad &= ~(SMP_CACHE_BYTES - 1);
1029                         priv->frag_info[i].frag_stride = frag_stride + pad;
1030 
1031                         buf_size += frag_size;
1032                         i++;
1033                 }
1034                 priv->dma_dir = PCI_DMA_FROMDEVICE;
1035                 priv->rx_headroom = 0;
1036         }
1037 
1038         priv->num_frags = i;
1039         priv->rx_skb_size = eff_mtu;
1040         priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
1041 
1042         en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d num_frags:%d):\n",
1043                eff_mtu, priv->num_frags);
1044         for (i = 0; i < priv->num_frags; i++) {
1045                 en_dbg(DRV,
1046                        priv,
1047                        "  frag:%d - size:%d stride:%d\n",
1048                        i,
1049                        priv->frag_info[i].frag_size,
1050                        priv->frag_info[i].frag_stride);
1051         }
1052 }
1053 
1054 /* RSS related functions */
1055 
1056 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
1057                                  struct mlx4_en_rx_ring *ring,
1058                                  enum mlx4_qp_state *state,
1059                                  struct mlx4_qp *qp)
1060 {
1061         struct mlx4_en_dev *mdev = priv->mdev;
1062         struct mlx4_qp_context *context;
1063         int err = 0;
1064 
1065         context = kmalloc(sizeof(*context), GFP_KERNEL);
1066         if (!context)
1067                 return -ENOMEM;
1068 
1069         err = mlx4_qp_alloc(mdev->dev, qpn, qp);
1070         if (err) {
1071                 en_err(priv, "Failed to allocate qp #%x\n", qpn);
1072                 goto out;
1073         }
1074         qp->event = mlx4_en_sqp_event;
1075 
1076         memset(context, 0, sizeof(*context));
1077         mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
1078                                 qpn, ring->cqn, -1, context);
1079         context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
1080 
1081         /* Cancel FCS removal if FW allows */
1082         if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
1083                 context->param3 |= cpu_to_be32(1 << 29);
1084                 if (priv->dev->features & NETIF_F_RXFCS)
1085                         ring->fcs_del = 0;
1086                 else
1087                         ring->fcs_del = ETH_FCS_LEN;
1088         } else
1089                 ring->fcs_del = 0;
1090 
1091         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
1092         if (err) {
1093                 mlx4_qp_remove(mdev->dev, qp);
1094                 mlx4_qp_free(mdev->dev, qp);
1095         }
1096         mlx4_en_update_rx_prod_db(ring);
1097 out:
1098         kfree(context);
1099         return err;
1100 }
1101 
1102 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
1103 {
1104         int err;
1105         u32 qpn;
1106 
1107         err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn,
1108                                     MLX4_RESERVE_A0_QP,
1109                                     MLX4_RES_USAGE_DRIVER);
1110         if (err) {
1111                 en_err(priv, "Failed reserving drop qpn\n");
1112                 return err;
1113         }
1114         err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp);
1115         if (err) {
1116                 en_err(priv, "Failed allocating drop qp\n");
1117                 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1118                 return err;
1119         }
1120 
1121         return 0;
1122 }
1123 
1124 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
1125 {
1126         u32 qpn;
1127 
1128         qpn = priv->drop_qp.qpn;
1129         mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
1130         mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
1131         mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1132 }
1133 
1134 /* Allocate rx qp's and configure them according to rss map */
1135 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
1136 {
1137         struct mlx4_en_dev *mdev = priv->mdev;
1138         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1139         struct mlx4_qp_context context;
1140         struct mlx4_rss_context *rss_context;
1141         int rss_rings;
1142         void *ptr;
1143         u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
1144                         MLX4_RSS_TCP_IPV6);
1145         int i, qpn;
1146         int err = 0;
1147         int good_qps = 0;
1148         u8 flags;
1149 
1150         en_dbg(DRV, priv, "Configuring rss steering\n");
1151 
1152         flags = priv->rx_ring_num == 1 ? MLX4_RESERVE_A0_QP : 0;
1153         err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
1154                                     priv->rx_ring_num,
1155                                     &rss_map->base_qpn, flags,
1156                                     MLX4_RES_USAGE_DRIVER);
1157         if (err) {
1158                 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
1159                 return err;
1160         }
1161 
1162         for (i = 0; i < priv->rx_ring_num; i++) {
1163                 qpn = rss_map->base_qpn + i;
1164                 err = mlx4_en_config_rss_qp(priv, qpn, priv->rx_ring[i],
1165                                             &rss_map->state[i],
1166                                             &rss_map->qps[i]);
1167                 if (err)
1168                         goto rss_err;
1169 
1170                 ++good_qps;
1171         }
1172 
1173         if (priv->rx_ring_num == 1) {
1174                 rss_map->indir_qp = &rss_map->qps[0];
1175                 priv->base_qpn = rss_map->indir_qp->qpn;
1176                 en_info(priv, "Optimized Non-RSS steering\n");
1177                 return 0;
1178         }
1179 
1180         rss_map->indir_qp = kzalloc(sizeof(*rss_map->indir_qp), GFP_KERNEL);
1181         if (!rss_map->indir_qp) {
1182                 err = -ENOMEM;
1183                 goto rss_err;
1184         }
1185 
1186         /* Configure RSS indirection qp */
1187         err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, rss_map->indir_qp);
1188         if (err) {
1189                 en_err(priv, "Failed to allocate RSS indirection QP\n");
1190                 goto qp_alloc_err;
1191         }
1192 
1193         rss_map->indir_qp->event = mlx4_en_sqp_event;
1194         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1195                                 priv->rx_ring[0]->cqn, -1, &context);
1196 
1197         if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
1198                 rss_rings = priv->rx_ring_num;
1199         else
1200                 rss_rings = priv->prof->rss_rings;
1201 
1202         ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
1203                                         + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
1204         rss_context = ptr;
1205         rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
1206                                             (rss_map->base_qpn));
1207         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1208         if (priv->mdev->profile.udp_rss) {
1209                 rss_mask |=  MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
1210                 rss_context->base_qpn_udp = rss_context->default_qpn;
1211         }
1212 
1213         if (mdev->dev->caps.tunnel_offload_mode == MLX4_TUNNEL_OFFLOAD_MODE_VXLAN) {
1214                 en_info(priv, "Setting RSS context tunnel type to RSS on inner headers\n");
1215                 rss_mask |= MLX4_RSS_BY_INNER_HEADERS;
1216         }
1217 
1218         rss_context->flags = rss_mask;
1219         rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1220         if (priv->rss_hash_fn == ETH_RSS_HASH_XOR) {
1221                 rss_context->hash_fn = MLX4_RSS_HASH_XOR;
1222         } else if (priv->rss_hash_fn == ETH_RSS_HASH_TOP) {
1223                 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1224                 memcpy(rss_context->rss_key, priv->rss_key,
1225                        MLX4_EN_RSS_KEY_SIZE);
1226         } else {
1227                 en_err(priv, "Unknown RSS hash function requested\n");
1228                 err = -EINVAL;
1229                 goto indir_err;
1230         }
1231 
1232         err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1233                                rss_map->indir_qp, &rss_map->indir_state);
1234         if (err)
1235                 goto indir_err;
1236 
1237         return 0;
1238 
1239 indir_err:
1240         mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1241                        MLX4_QP_STATE_RST, NULL, 0, 0, rss_map->indir_qp);
1242         mlx4_qp_remove(mdev->dev, rss_map->indir_qp);
1243         mlx4_qp_free(mdev->dev, rss_map->indir_qp);
1244 qp_alloc_err:
1245         kfree(rss_map->indir_qp);
1246         rss_map->indir_qp = NULL;
1247 rss_err:
1248         for (i = 0; i < good_qps; i++) {
1249                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1250                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1251                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1252                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1253         }
1254         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1255         return err;
1256 }
1257 
1258 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1259 {
1260         struct mlx4_en_dev *mdev = priv->mdev;
1261         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1262         int i;
1263 
1264         if (priv->rx_ring_num > 1) {
1265                 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1266                                MLX4_QP_STATE_RST, NULL, 0, 0,
1267                                rss_map->indir_qp);
1268                 mlx4_qp_remove(mdev->dev, rss_map->indir_qp);
1269                 mlx4_qp_free(mdev->dev, rss_map->indir_qp);
1270                 kfree(rss_map->indir_qp);
1271                 rss_map->indir_qp = NULL;
1272         }
1273 
1274         for (i = 0; i < priv->rx_ring_num; i++) {
1275                 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1276                                MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1277                 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1278                 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1279         }
1280         mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1281 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/mellanox/mlx4/en_rx.c

DEFINITIONS
