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