drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2018 Intel Corporation. */
   3
   4 #include <linux/bpf_trace.h>
   5 #include <net/xdp_sock.h>
   6 #include <net/xdp.h>
   7
   8 #include "ixgbe.h"
   9 #include "ixgbe_txrx_common.h"
  10
  11 struct xdp_umem *ixgbe_xsk_umem(struct ixgbe_adapter *adapter,
  12                                 struct ixgbe_ring *ring)
  13 {
  14         bool xdp_on = READ_ONCE(adapter->xdp_prog);
  15         int qid = ring->ring_idx;
  16
  17         if (!adapter->xsk_umems || !adapter->xsk_umems[qid] ||
  18             qid >= adapter->num_xsk_umems || !xdp_on)
  19                 return NULL;
  20
  21         return adapter->xsk_umems[qid];
  22 }
  23
  24 static int ixgbe_alloc_xsk_umems(struct ixgbe_adapter *adapter)
  25 {
  26         if (adapter->xsk_umems)
  27                 return 0;
  28
  29         adapter->num_xsk_umems_used = 0;
  30         adapter->num_xsk_umems = adapter->num_rx_queues;
  31         adapter->xsk_umems = kcalloc(adapter->num_xsk_umems,
  32                                      sizeof(*adapter->xsk_umems),
  33                                      GFP_KERNEL);
  34         if (!adapter->xsk_umems) {
  35                 adapter->num_xsk_umems = 0;
  36                 return -ENOMEM;
  37         }
  38
  39         return 0;
  40 }
  41
  42 static int ixgbe_add_xsk_umem(struct ixgbe_adapter *adapter,
  43                               struct xdp_umem *umem,
  44                               u16 qid)
  45 {
  46         int err;
  47
  48         err = ixgbe_alloc_xsk_umems(adapter);
  49         if (err)
  50                 return err;
  51
  52         adapter->xsk_umems[qid] = umem;
  53         adapter->num_xsk_umems_used++;
  54
  55         return 0;
  56 }
  57
  58 static void ixgbe_remove_xsk_umem(struct ixgbe_adapter *adapter, u16 qid)
  59 {
  60         adapter->xsk_umems[qid] = NULL;
  61         adapter->num_xsk_umems_used--;
  62
  63         if (adapter->num_xsk_umems == 0) {
  64                 kfree(adapter->xsk_umems);
  65                 adapter->xsk_umems = NULL;
  66                 adapter->num_xsk_umems = 0;
  67         }
  68 }
  69
  70 static int ixgbe_xsk_umem_dma_map(struct ixgbe_adapter *adapter,
  71                                   struct xdp_umem *umem)
  72 {
  73         struct device *dev = &adapter->pdev->dev;
  74         unsigned int i, j;
  75         dma_addr_t dma;
  76
  77         for (i = 0; i < umem->npgs; i++) {
  78                 dma = dma_map_page_attrs(dev, umem->pgs[i], 0, PAGE_SIZE,
  79                                          DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
  80                 if (dma_mapping_error(dev, dma))
  81                         goto out_unmap;
  82
  83                 umem->pages[i].dma = dma;
  84         }
  85
  86         return 0;
  87
  88 out_unmap:
  89         for (j = 0; j < i; j++) {
  90                 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
  91                                      DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
  92                 umem->pages[i].dma = 0;
  93         }
  94
  95         return -1;
  96 }
  97
  98 static void ixgbe_xsk_umem_dma_unmap(struct ixgbe_adapter *adapter,
  99                                      struct xdp_umem *umem)
 100 {
 101         struct device *dev = &adapter->pdev->dev;
 102         unsigned int i;
 103
 104         for (i = 0; i < umem->npgs; i++) {
 105                 dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
 106                                      DMA_BIDIRECTIONAL, IXGBE_RX_DMA_ATTR);
 107
 108                 umem->pages[i].dma = 0;
 109         }
 110 }
 111
 112 static int ixgbe_xsk_umem_enable(struct ixgbe_adapter *adapter,
 113                                  struct xdp_umem *umem,
 114                                  u16 qid)
 115 {
 116         struct xdp_umem_fq_reuse *reuseq;
 117         bool if_running;
 118         int err;
 119
 120         if (qid >= adapter->num_rx_queues)
 121                 return -EINVAL;
 122
 123         if (adapter->xsk_umems) {
 124                 if (qid >= adapter->num_xsk_umems)
 125                         return -EINVAL;
 126                 if (adapter->xsk_umems[qid])
 127                         return -EBUSY;
 128         }
 129
 130         reuseq = xsk_reuseq_prepare(adapter->rx_ring[0]->count);
 131         if (!reuseq)
 132                 return -ENOMEM;
 133
 134         xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
 135
 136         err = ixgbe_xsk_umem_dma_map(adapter, umem);
 137         if (err)
 138                 return err;
 139
 140         if_running = netif_running(adapter->netdev) &&
 141                      READ_ONCE(adapter->xdp_prog);
 142
 143         if (if_running)
 144                 ixgbe_txrx_ring_disable(adapter, qid);
 145
 146         err = ixgbe_add_xsk_umem(adapter, umem, qid);
 147         if (err)
 148                 return err;
 149
 150         if (if_running) {
 151                 ixgbe_txrx_ring_enable(adapter, qid);
 152
 153                 /* Kick start the NAPI context so that receiving will start */
 154                 err = ixgbe_xsk_async_xmit(adapter->netdev, qid);
 155                 if (err)
 156                         return err;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int ixgbe_xsk_umem_disable(struct ixgbe_adapter *adapter, u16 qid)
 163 {
 164         bool if_running;
 165
 166         if (!adapter->xsk_umems || qid >= adapter->num_xsk_umems ||
 167             !adapter->xsk_umems[qid])
 168                 return -EINVAL;
 169
 170         if_running = netif_running(adapter->netdev) &&
 171                      READ_ONCE(adapter->xdp_prog);
 172
 173         if (if_running)
 174                 ixgbe_txrx_ring_disable(adapter, qid);
 175
 176         ixgbe_xsk_umem_dma_unmap(adapter, adapter->xsk_umems[qid]);
 177         ixgbe_remove_xsk_umem(adapter, qid);
 178
 179         if (if_running)
 180                 ixgbe_txrx_ring_enable(adapter, qid);
 181
 182         return 0;
 183 }
 184
 185 int ixgbe_xsk_umem_query(struct ixgbe_adapter *adapter, struct xdp_umem **umem,
 186                          u16 qid)
 187 {
 188         if (qid >= adapter->num_rx_queues)
 189                 return -EINVAL;
 190
 191         if (adapter->xsk_umems) {
 192                 if (qid >= adapter->num_xsk_umems)
 193                         return -EINVAL;
 194                 *umem = adapter->xsk_umems[qid];
 195                 return 0;
 196         }
 197
 198         *umem = NULL;
 199         return 0;
 200 }
 201
 202 int ixgbe_xsk_umem_setup(struct ixgbe_adapter *adapter, struct xdp_umem *umem,
 203                          u16 qid)
 204 {
 205         return umem ? ixgbe_xsk_umem_enable(adapter, umem, qid) :
 206                 ixgbe_xsk_umem_disable(adapter, qid);
 207 }
 208
 209 static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
 210                             struct ixgbe_ring *rx_ring,
 211                             struct xdp_buff *xdp)
 212 {
 213         int err, result = IXGBE_XDP_PASS;
 214         struct bpf_prog *xdp_prog;
 215         struct xdp_frame *xdpf;
 216         u32 act;
 217
 218         rcu_read_lock();
 219         xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 220         act = bpf_prog_run_xdp(xdp_prog, xdp);
 221         xdp->handle += xdp->data - xdp->data_hard_start;
 222         switch (act) {
 223         case XDP_PASS:
 224                 break;
 225         case XDP_TX:
 226                 xdpf = convert_to_xdp_frame(xdp);
 227                 if (unlikely(!xdpf)) {
 228                         result = IXGBE_XDP_CONSUMED;
 229                         break;
 230                 }
 231                 result = ixgbe_xmit_xdp_ring(adapter, xdpf);
 232                 break;
 233         case XDP_REDIRECT:
 234                 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
 235                 result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
 236                 break;
 237         default:
 238                 bpf_warn_invalid_xdp_action(act);
 239                 /* fallthrough */
 240         case XDP_ABORTED:
 241                 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 242                 /* fallthrough -- handle aborts by dropping packet */
 243         case XDP_DROP:
 244                 result = IXGBE_XDP_CONSUMED;
 245                 break;
 246         }
 247         rcu_read_unlock();
 248         return result;
 249 }
 250
 251 static struct
 252 ixgbe_rx_buffer *ixgbe_get_rx_buffer_zc(struct ixgbe_ring *rx_ring,
 253                                         unsigned int size)
 254 {
 255         struct ixgbe_rx_buffer *bi;
 256
 257         bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
 258
 259         /* we are reusing so sync this buffer for CPU use */
 260         dma_sync_single_range_for_cpu(rx_ring->dev,
 261                                       bi->dma, 0,
 262                                       size,
 263                                       DMA_BIDIRECTIONAL);
 264
 265         return bi;
 266 }
 267
 268 static void ixgbe_reuse_rx_buffer_zc(struct ixgbe_ring *rx_ring,
 269                                      struct ixgbe_rx_buffer *obi)
 270 {
 271         unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask;
 272         u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
 273         u16 nta = rx_ring->next_to_alloc;
 274         struct ixgbe_rx_buffer *nbi;
 275
 276         nbi = &rx_ring->rx_buffer_info[rx_ring->next_to_alloc];
 277         /* update, and store next to alloc */
 278         nta++;
 279         rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
 280
 281         /* transfer page from old buffer to new buffer */
 282         nbi->dma = obi->dma & mask;
 283         nbi->dma += hr;
 284
 285         nbi->addr = (void *)((unsigned long)obi->addr & mask);
 286         nbi->addr += hr;
 287
 288         nbi->handle = obi->handle & mask;
 289         nbi->handle += rx_ring->xsk_umem->headroom;
 290
 291         obi->addr = NULL;
 292         obi->skb = NULL;
 293 }
 294
 295 void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
 296 {
 297         struct ixgbe_rx_buffer *bi;
 298         struct ixgbe_ring *rx_ring;
 299         u64 hr, mask;
 300         u16 nta;
 301
 302         rx_ring = container_of(alloc, struct ixgbe_ring, zca);
 303         hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
 304         mask = rx_ring->xsk_umem->chunk_mask;
 305
 306         nta = rx_ring->next_to_alloc;
 307         bi = rx_ring->rx_buffer_info;
 308
 309         nta++;
 310         rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
 311
 312         handle &= mask;
 313
 314         bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
 315         bi->dma += hr;
 316
 317         bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
 318         bi->addr += hr;
 319
 320         bi->handle = (u64)handle + rx_ring->xsk_umem->headroom;
 321 }
 322
 323 static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
 324                                   struct ixgbe_rx_buffer *bi)
 325 {
 326         struct xdp_umem *umem = rx_ring->xsk_umem;
 327         void *addr = bi->addr;
 328         u64 handle, hr;
 329
 330         if (addr)
 331                 return true;
 332
 333         if (!xsk_umem_peek_addr(umem, &handle)) {
 334                 rx_ring->rx_stats.alloc_rx_page_failed++;
 335                 return false;
 336         }
 337
 338         hr = umem->headroom + XDP_PACKET_HEADROOM;
 339
 340         bi->dma = xdp_umem_get_dma(umem, handle);
 341         bi->dma += hr;
 342
 343         bi->addr = xdp_umem_get_data(umem, handle);
 344         bi->addr += hr;
 345
 346         bi->handle = handle + umem->headroom;
 347
 348         xsk_umem_discard_addr(umem);
 349         return true;
 350 }
 351
 352 static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
 353                                        struct ixgbe_rx_buffer *bi)
 354 {
 355         struct xdp_umem *umem = rx_ring->xsk_umem;
 356         u64 handle, hr;
 357
 358         if (!xsk_umem_peek_addr_rq(umem, &handle)) {
 359                 rx_ring->rx_stats.alloc_rx_page_failed++;
 360                 return false;
 361         }
 362
 363         handle &= rx_ring->xsk_umem->chunk_mask;
 364
 365         hr = umem->headroom + XDP_PACKET_HEADROOM;
 366
 367         bi->dma = xdp_umem_get_dma(umem, handle);
 368         bi->dma += hr;
 369
 370         bi->addr = xdp_umem_get_data(umem, handle);
 371         bi->addr += hr;
 372
 373         bi->handle = handle + umem->headroom;
 374
 375         xsk_umem_discard_addr_rq(umem);
 376         return true;
 377 }
 378
 379 static __always_inline bool
 380 __ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 cleaned_count,
 381                             bool alloc(struct ixgbe_ring *rx_ring,
 382                                        struct ixgbe_rx_buffer *bi))
 383 {
 384         union ixgbe_adv_rx_desc *rx_desc;
 385         struct ixgbe_rx_buffer *bi;
 386         u16 i = rx_ring->next_to_use;
 387         bool ok = true;
 388
 389         /* nothing to do */
 390         if (!cleaned_count)
 391                 return true;
 392
 393         rx_desc = IXGBE_RX_DESC(rx_ring, i);
 394         bi = &rx_ring->rx_buffer_info[i];
 395         i -= rx_ring->count;
 396
 397         do {
 398                 if (!alloc(rx_ring, bi)) {
 399                         ok = false;
 400                         break;
 401                 }
 402
 403                 /* sync the buffer for use by the device */
 404                 dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
 405                                                  bi->page_offset,
 406                                                  rx_ring->rx_buf_len,
 407                                                  DMA_BIDIRECTIONAL);
 408
 409                 /* Refresh the desc even if buffer_addrs didn't change
 410                  * because each write-back erases this info.
 411                  */
 412                 rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
 413
 414                 rx_desc++;
 415                 bi++;
 416                 i++;
 417                 if (unlikely(!i)) {
 418                         rx_desc = IXGBE_RX_DESC(rx_ring, 0);
 419                         bi = rx_ring->rx_buffer_info;
 420                         i -= rx_ring->count;
 421                 }
 422
 423                 /* clear the length for the next_to_use descriptor */
 424                 rx_desc->wb.upper.length = 0;
 425
 426                 cleaned_count--;
 427         } while (cleaned_count);
 428
 429         i += rx_ring->count;
 430
 431         if (rx_ring->next_to_use != i) {
 432                 rx_ring->next_to_use = i;
 433
 434                 /* update next to alloc since we have filled the ring */
 435                 rx_ring->next_to_alloc = i;
 436
 437                 /* Force memory writes to complete before letting h/w
 438                  * know there are new descriptors to fetch.  (Only
 439                  * applicable for weak-ordered memory model archs,
 440                  * such as IA-64).
 441                  */
 442                 wmb();
 443                 writel(i, rx_ring->tail);
 444         }
 445
 446         return ok;
 447 }
 448
 449 void ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
 450 {
 451         __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
 452                                     ixgbe_alloc_buffer_slow_zc);
 453 }
 454
 455 static bool ixgbe_alloc_rx_buffers_fast_zc(struct ixgbe_ring *rx_ring,
 456                                            u16 count)
 457 {
 458         return __ixgbe_alloc_rx_buffers_zc(rx_ring, count,
 459                                            ixgbe_alloc_buffer_zc);
 460 }
 461
 462 static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
 463                                               struct ixgbe_rx_buffer *bi,
 464                                               struct xdp_buff *xdp)
 465 {
 466         unsigned int metasize = xdp->data - xdp->data_meta;
 467         unsigned int datasize = xdp->data_end - xdp->data;
 468         struct sk_buff *skb;
 469
 470         /* allocate a skb to store the frags */
 471         skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
 472                                xdp->data_end - xdp->data_hard_start,
 473                                GFP_ATOMIC | __GFP_NOWARN);
 474         if (unlikely(!skb))
 475                 return NULL;
 476
 477         skb_reserve(skb, xdp->data - xdp->data_hard_start);
 478         memcpy(__skb_put(skb, datasize), xdp->data, datasize);
 479         if (metasize)
 480                 skb_metadata_set(skb, metasize);
 481
 482         ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
 483         return skb;
 484 }
 485
 486 static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring)
 487 {
 488         u32 ntc = rx_ring->next_to_clean + 1;
 489
 490         ntc = (ntc < rx_ring->count) ? ntc : 0;
 491         rx_ring->next_to_clean = ntc;
 492         prefetch(IXGBE_RX_DESC(rx_ring, ntc));
 493 }
 494
 495 int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,
 496                           struct ixgbe_ring *rx_ring,
 497                           const int budget)
 498 {
 499         unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 500         struct ixgbe_adapter *adapter = q_vector->adapter;
 501         u16 cleaned_count = ixgbe_desc_unused(rx_ring);
 502         unsigned int xdp_res, xdp_xmit = 0;
 503         bool failure = false;
 504         struct sk_buff *skb;
 505         struct xdp_buff xdp;
 506
 507         xdp.rxq = &rx_ring->xdp_rxq;
 508
 509         while (likely(total_rx_packets < budget)) {
 510                 union ixgbe_adv_rx_desc *rx_desc;
 511                 struct ixgbe_rx_buffer *bi;
 512                 unsigned int size;
 513
 514                 /* return some buffers to hardware, one at a time is too slow */
 515                 if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
 516                         failure = failure ||
 517                                   !ixgbe_alloc_rx_buffers_fast_zc(rx_ring,
 518                                                                  cleaned_count);
 519                         cleaned_count = 0;
 520                 }
 521
 522                 rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean);
 523                 size = le16_to_cpu(rx_desc->wb.upper.length);
 524                 if (!size)
 525                         break;
 526
 527                 /* This memory barrier is needed to keep us from reading
 528                  * any other fields out of the rx_desc until we know the
 529                  * descriptor has been written back
 530                  */
 531                 dma_rmb();
 532
 533                 bi = ixgbe_get_rx_buffer_zc(rx_ring, size);
 534
 535                 if (unlikely(!ixgbe_test_staterr(rx_desc,
 536                                                  IXGBE_RXD_STAT_EOP))) {
 537                         struct ixgbe_rx_buffer *next_bi;
 538
 539                         ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
 540                         ixgbe_inc_ntc(rx_ring);
 541                         next_bi =
 542                                &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
 543                         next_bi->skb = ERR_PTR(-EINVAL);
 544                         continue;
 545                 }
 546
 547                 if (unlikely(bi->skb)) {
 548                         ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
 549                         ixgbe_inc_ntc(rx_ring);
 550                         continue;
 551                 }
 552
 553                 xdp.data = bi->addr;
 554                 xdp.data_meta = xdp.data;
 555                 xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
 556                 xdp.data_end = xdp.data + size;
 557                 xdp.handle = bi->handle;
 558
 559                 xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, &xdp);
 560
 561                 if (xdp_res) {
 562                         if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) {
 563                                 xdp_xmit |= xdp_res;
 564                                 bi->addr = NULL;
 565                                 bi->skb = NULL;
 566                         } else {
 567                                 ixgbe_reuse_rx_buffer_zc(rx_ring, bi);
 568                         }
 569                         total_rx_packets++;
 570                         total_rx_bytes += size;
 571
 572                         cleaned_count++;
 573                         ixgbe_inc_ntc(rx_ring);
 574                         continue;
 575                 }
 576
 577                 /* XDP_PASS path */
 578                 skb = ixgbe_construct_skb_zc(rx_ring, bi, &xdp);
 579                 if (!skb) {
 580                         rx_ring->rx_stats.alloc_rx_buff_failed++;
 581                         break;
 582                 }
 583
 584                 cleaned_count++;
 585                 ixgbe_inc_ntc(rx_ring);
 586
 587                 if (eth_skb_pad(skb))
 588                         continue;
 589
 590                 total_rx_bytes += skb->len;
 591                 total_rx_packets++;
 592
 593                 ixgbe_process_skb_fields(rx_ring, rx_desc, skb);
 594                 ixgbe_rx_skb(q_vector, skb);
 595         }
 596
 597         if (xdp_xmit & IXGBE_XDP_REDIR)
 598                 xdp_do_flush_map();
 599
 600         if (xdp_xmit & IXGBE_XDP_TX) {
 601                 struct ixgbe_ring *ring = adapter->xdp_ring[smp_processor_id()];
 602
 603                 /* Force memory writes to complete before letting h/w
 604                  * know there are new descriptors to fetch.
 605                  */
 606                 wmb();
 607                 writel(ring->next_to_use, ring->tail);
 608         }
 609
 610         u64_stats_update_begin(&rx_ring->syncp);
 611         rx_ring->stats.packets += total_rx_packets;
 612         rx_ring->stats.bytes += total_rx_bytes;
 613         u64_stats_update_end(&rx_ring->syncp);
 614         q_vector->rx.total_packets += total_rx_packets;
 615         q_vector->rx.total_bytes += total_rx_bytes;
 616
 617         return failure ? budget : (int)total_rx_packets;
 618 }
 619
 620 void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring)
 621 {
 622         u16 i = rx_ring->next_to_clean;
 623         struct ixgbe_rx_buffer *bi = &rx_ring->rx_buffer_info[i];
 624
 625         while (i != rx_ring->next_to_alloc) {
 626                 xsk_umem_fq_reuse(rx_ring->xsk_umem, bi->handle);
 627                 i++;
 628                 bi++;
 629                 if (i == rx_ring->count) {
 630                         i = 0;
 631                         bi = rx_ring->rx_buffer_info;
 632                 }
 633         }
 634 }
 635
 636 static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
 637 {
 638         union ixgbe_adv_tx_desc *tx_desc = NULL;
 639         struct ixgbe_tx_buffer *tx_bi;
 640         bool work_done = true;
 641         u32 len, cmd_type;
 642         dma_addr_t dma;
 643
 644         while (budget-- > 0) {
 645                 if (unlikely(!ixgbe_desc_unused(xdp_ring))) {
 646                         work_done = false;
 647                         break;
 648                 }
 649
 650                 if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &dma, &len))
 651                         break;
 652
 653                 dma_sync_single_for_device(xdp_ring->dev, dma, len,
 654                                            DMA_BIDIRECTIONAL);
 655
 656                 tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use];
 657                 tx_bi->bytecount = len;
 658                 tx_bi->xdpf = NULL;
 659
 660                 tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use);
 661                 tx_desc->read.buffer_addr = cpu_to_le64(dma);
 662
 663                 /* put descriptor type bits */
 664                 cmd_type = IXGBE_ADVTXD_DTYP_DATA |
 665                            IXGBE_ADVTXD_DCMD_DEXT |
 666                            IXGBE_ADVTXD_DCMD_IFCS;
 667                 cmd_type |= len | IXGBE_TXD_CMD;
 668                 tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
 669                 tx_desc->read.olinfo_status =
 670                         cpu_to_le32(len << IXGBE_ADVTXD_PAYLEN_SHIFT);
 671
 672                 xdp_ring->next_to_use++;
 673                 if (xdp_ring->next_to_use == xdp_ring->count)
 674                         xdp_ring->next_to_use = 0;
 675         }
 676
 677         if (tx_desc) {
 678                 ixgbe_xdp_ring_update_tail(xdp_ring);
 679                 xsk_umem_consume_tx_done(xdp_ring->xsk_umem);
 680         }
 681
 682         return !!budget && work_done;
 683 }
 684
 685 static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring,
 686                                       struct ixgbe_tx_buffer *tx_bi)
 687 {
 688         xdp_return_frame(tx_bi->xdpf);
 689         dma_unmap_single(tx_ring->dev,
 690                          dma_unmap_addr(tx_bi, dma),
 691                          dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
 692         dma_unmap_len_set(tx_bi, len, 0);
 693 }
 694
 695 bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector,
 696                             struct ixgbe_ring *tx_ring, int napi_budget)
 697 {
 698         unsigned int total_packets = 0, total_bytes = 0;
 699         u32 i = tx_ring->next_to_clean, xsk_frames = 0;
 700         unsigned int budget = q_vector->tx.work_limit;
 701         struct xdp_umem *umem = tx_ring->xsk_umem;
 702         union ixgbe_adv_tx_desc *tx_desc;
 703         struct ixgbe_tx_buffer *tx_bi;
 704         bool xmit_done;
 705
 706         tx_bi = &tx_ring->tx_buffer_info[i];
 707         tx_desc = IXGBE_TX_DESC(tx_ring, i);
 708         i -= tx_ring->count;
 709
 710         do {
 711                 if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))
 712                         break;
 713
 714                 total_bytes += tx_bi->bytecount;
 715                 total_packets += tx_bi->gso_segs;
 716
 717                 if (tx_bi->xdpf)
 718                         ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
 719                 else
 720                         xsk_frames++;
 721
 722                 tx_bi->xdpf = NULL;
 723                 total_bytes += tx_bi->bytecount;
 724
 725                 tx_bi++;
 726                 tx_desc++;
 727                 i++;
 728                 if (unlikely(!i)) {
 729                         i -= tx_ring->count;
 730                         tx_bi = tx_ring->tx_buffer_info;
 731                         tx_desc = IXGBE_TX_DESC(tx_ring, 0);
 732                 }
 733
 734                 /* issue prefetch for next Tx descriptor */
 735                 prefetch(tx_desc);
 736
 737                 /* update budget accounting */
 738                 budget--;
 739         } while (likely(budget));
 740
 741         i += tx_ring->count;
 742         tx_ring->next_to_clean = i;
 743
 744         u64_stats_update_begin(&tx_ring->syncp);
 745         tx_ring->stats.bytes += total_bytes;
 746         tx_ring->stats.packets += total_packets;
 747         u64_stats_update_end(&tx_ring->syncp);
 748         q_vector->tx.total_bytes += total_bytes;
 749         q_vector->tx.total_packets += total_packets;
 750
 751         if (xsk_frames)
 752                 xsk_umem_complete_tx(umem, xsk_frames);
 753
 754         xmit_done = ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit);
 755         return budget > 0 && xmit_done;
 756 }
 757
 758 int ixgbe_xsk_async_xmit(struct net_device *dev, u32 qid)
 759 {
 760         struct ixgbe_adapter *adapter = netdev_priv(dev);
 761         struct ixgbe_ring *ring;
 762
 763         if (test_bit(__IXGBE_DOWN, &adapter->state))
 764                 return -ENETDOWN;
 765
 766         if (!READ_ONCE(adapter->xdp_prog))
 767                 return -ENXIO;
 768
 769         if (qid >= adapter->num_xdp_queues)
 770                 return -ENXIO;
 771
 772         if (!adapter->xsk_umems || !adapter->xsk_umems[qid])
 773                 return -ENXIO;
 774
 775         ring = adapter->xdp_ring[qid];
 776         if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) {
 777                 u64 eics = BIT_ULL(ring->q_vector->v_idx);
 778
 779                 ixgbe_irq_rearm_queues(adapter, eics);
 780         }
 781
 782         return 0;
 783 }
 784
 785 void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring)
 786 {
 787         u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
 788         struct xdp_umem *umem = tx_ring->xsk_umem;
 789         struct ixgbe_tx_buffer *tx_bi;
 790         u32 xsk_frames = 0;
 791
 792         while (ntc != ntu) {
 793                 tx_bi = &tx_ring->tx_buffer_info[ntc];
 794
 795                 if (tx_bi->xdpf)
 796                         ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);
 797                 else
 798                         xsk_frames++;
 799
 800                 tx_bi->xdpf = NULL;
 801
 802                 ntc++;
 803                 if (ntc == tx_ring->count)
 804                         ntc = 0;
 805         }
 806
 807         if (xsk_frames)
 808                 xsk_umem_complete_tx(umem, xsk_frames);
 809 }