drivers/net/ethernet/intel/i40e/i40e_xsk.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2018 Intel Corporation. */
   3
   4 #include <linux/bpf_trace.h>
   5 #include <linux/stringify.h>
   6 #include <net/xdp_sock_drv.h>
   7 #include <net/xdp.h>
   8
   9 #include "i40e.h"
  10 #include "i40e_txrx_common.h"
  11 #include "i40e_xsk.h"
  12
  13 int i40e_alloc_rx_bi_zc(struct i40e_ring *rx_ring)
  14 {
  15         unsigned long sz = sizeof(*rx_ring->rx_bi_zc) * rx_ring->count;
  16
  17         rx_ring->rx_bi_zc = kzalloc(sz, GFP_KERNEL);
  18         return rx_ring->rx_bi_zc ? 0 : -ENOMEM;
  19 }
  20
  21 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring)
  22 {
  23         memset(rx_ring->rx_bi_zc, 0,
  24                sizeof(*rx_ring->rx_bi_zc) * rx_ring->count);
  25 }
  26
  27 static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx)
  28 {
  29         return &rx_ring->rx_bi_zc[idx];
  30 }
  31
  32 /**
  33  * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a
  34  * certain ring/qid
  35  * @vsi: Current VSI
  36  * @pool: buffer pool
  37  * @qid: Rx ring to associate buffer pool with
  38  *
  39  * Returns 0 on success, <0 on failure
  40  **/
  41 static int i40e_xsk_pool_enable(struct i40e_vsi *vsi,
  42                                 struct xsk_buff_pool *pool,
  43                                 u16 qid)
  44 {
  45         struct net_device *netdev = vsi->netdev;
  46         bool if_running;
  47         int err;
  48
  49         if (vsi->type != I40E_VSI_MAIN)
  50                 return -EINVAL;
  51
  52         if (qid >= vsi->num_queue_pairs)
  53                 return -EINVAL;
  54
  55         if (qid >= netdev->real_num_rx_queues ||
  56             qid >= netdev->real_num_tx_queues)
  57                 return -EINVAL;
  58
  59         err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR);
  60         if (err)
  61                 return err;
  62
  63         set_bit(qid, vsi->af_xdp_zc_qps);
  64
  65         if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
  66
  67         if (if_running) {
  68                 err = i40e_queue_pair_disable(vsi, qid);
  69                 if (err)
  70                         return err;
  71
  72                 err = i40e_queue_pair_enable(vsi, qid);
  73                 if (err)
  74                         return err;
  75
  76                 /* Kick start the NAPI context so that receiving will start */
  77                 err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX);
  78                 if (err)
  79                         return err;
  80         }
  81
  82         return 0;
  83 }
  84
  85 /**
  86  * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a
  87  * certain ring/qid
  88  * @vsi: Current VSI
  89  * @qid: Rx ring to associate buffer pool with
  90  *
  91  * Returns 0 on success, <0 on failure
  92  **/
  93 static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid)
  94 {
  95         struct net_device *netdev = vsi->netdev;
  96         struct xsk_buff_pool *pool;
  97         bool if_running;
  98         int err;
  99
 100         pool = xsk_get_pool_from_qid(netdev, qid);
 101         if (!pool)
 102                 return -EINVAL;
 103
 104         if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
 105
 106         if (if_running) {
 107                 err = i40e_queue_pair_disable(vsi, qid);
 108                 if (err)
 109                         return err;
 110         }
 111
 112         clear_bit(qid, vsi->af_xdp_zc_qps);
 113         xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR);
 114
 115         if (if_running) {
 116                 err = i40e_queue_pair_enable(vsi, qid);
 117                 if (err)
 118                         return err;
 119         }
 120
 121         return 0;
 122 }
 123
 124 /**
 125  * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from
 126  * a ring/qid
 127  * @vsi: Current VSI
 128  * @pool: Buffer pool to enable/associate to a ring, or NULL to disable
 129  * @qid: Rx ring to (dis)associate buffer pool (from)to
 130  *
 131  * This function enables or disables a buffer pool to a certain ring.
 132  *
 133  * Returns 0 on success, <0 on failure
 134  **/
 135 int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool,
 136                         u16 qid)
 137 {
 138         return pool ? i40e_xsk_pool_enable(vsi, pool, qid) :
 139                 i40e_xsk_pool_disable(vsi, qid);
 140 }
 141
 142 /**
 143  * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff
 144  * @rx_ring: Rx ring
 145  * @xdp: xdp_buff used as input to the XDP program
 146  *
 147  * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
 148  **/
 149 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 150 {
 151         int err, result = I40E_XDP_PASS;
 152         struct i40e_ring *xdp_ring;
 153         struct bpf_prog *xdp_prog;
 154         u32 act;
 155
 156         rcu_read_lock();
 157         /* NB! xdp_prog will always be !NULL, due to the fact that
 158          * this path is enabled by setting an XDP program.
 159          */
 160         xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 161         act = bpf_prog_run_xdp(xdp_prog, xdp);
 162
 163         switch (act) {
 164         case XDP_PASS:
 165                 break;
 166         case XDP_TX:
 167                 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
 168                 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
 169                 break;
 170         case XDP_REDIRECT:
 171                 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
 172                 result = !err ? I40E_XDP_REDIR : I40E_XDP_CONSUMED;
 173                 break;
 174         default:
 175                 bpf_warn_invalid_xdp_action(act);
 176                 fallthrough;
 177         case XDP_ABORTED:
 178                 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 179                 fallthrough; /* handle aborts by dropping packet */
 180         case XDP_DROP:
 181                 result = I40E_XDP_CONSUMED;
 182                 break;
 183         }
 184         rcu_read_unlock();
 185         return result;
 186 }
 187
 188 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 189 {
 190         u16 ntu = rx_ring->next_to_use;
 191         union i40e_rx_desc *rx_desc;
 192         struct xdp_buff **bi, *xdp;
 193         dma_addr_t dma;
 194         bool ok = true;
 195
 196         rx_desc = I40E_RX_DESC(rx_ring, ntu);
 197         bi = i40e_rx_bi(rx_ring, ntu);
 198         do {
 199                 xdp = xsk_buff_alloc(rx_ring->xsk_pool);
 200                 if (!xdp) {
 201                         ok = false;
 202                         goto no_buffers;
 203                 }
 204                 *bi = xdp;
 205                 dma = xsk_buff_xdp_get_dma(xdp);
 206                 rx_desc->read.pkt_addr = cpu_to_le64(dma);
 207                 rx_desc->read.hdr_addr = 0;
 208
 209                 rx_desc++;
 210                 bi++;
 211                 ntu++;
 212
 213                 if (unlikely(ntu == rx_ring->count)) {
 214                         rx_desc = I40E_RX_DESC(rx_ring, 0);
 215                         bi = i40e_rx_bi(rx_ring, 0);
 216                         ntu = 0;
 217                 }
 218
 219                 count--;
 220         } while (count);
 221
 222 no_buffers:
 223         if (rx_ring->next_to_use != ntu) {
 224                 /* clear the status bits for the next_to_use descriptor */
 225                 rx_desc->wb.qword1.status_error_len = 0;
 226                 i40e_release_rx_desc(rx_ring, ntu);
 227         }
 228
 229         return ok;
 230 }
 231
 232 /**
 233  * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
 234  * @rx_ring: Rx ring
 235  * @xdp: xdp_buff
 236  *
 237  * This functions allocates a new skb from a zero-copy Rx buffer.
 238  *
 239  * Returns the skb, or NULL on failure.
 240  **/
 241 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
 242                                              struct xdp_buff *xdp)
 243 {
 244         unsigned int metasize = xdp->data - xdp->data_meta;
 245         unsigned int datasize = xdp->data_end - xdp->data;
 246         struct sk_buff *skb;
 247
 248         /* allocate a skb to store the frags */
 249         skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
 250                                xdp->data_end - xdp->data_hard_start,
 251                                GFP_ATOMIC | __GFP_NOWARN);
 252         if (unlikely(!skb))
 253                 return NULL;
 254
 255         skb_reserve(skb, xdp->data - xdp->data_hard_start);
 256         memcpy(__skb_put(skb, datasize), xdp->data, datasize);
 257         if (metasize)
 258                 skb_metadata_set(skb, metasize);
 259
 260         xsk_buff_free(xdp);
 261         return skb;
 262 }
 263
 264 /**
 265  * i40e_inc_ntc: Advance the next_to_clean index
 266  * @rx_ring: Rx ring
 267  **/
 268 static void i40e_inc_ntc(struct i40e_ring *rx_ring)
 269 {
 270         u32 ntc = rx_ring->next_to_clean + 1;
 271
 272         ntc = (ntc < rx_ring->count) ? ntc : 0;
 273         rx_ring->next_to_clean = ntc;
 274 }
 275
 276 /**
 277  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
 278  * @rx_ring: Rx ring
 279  * @budget: NAPI budget
 280  *
 281  * Returns amount of work completed
 282  **/
 283 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 284 {
 285         unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 286         u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
 287         unsigned int xdp_res, xdp_xmit = 0;
 288         bool failure = false;
 289         struct sk_buff *skb;
 290
 291         while (likely(total_rx_packets < (unsigned int)budget)) {
 292                 union i40e_rx_desc *rx_desc;
 293                 struct xdp_buff **bi;
 294                 unsigned int size;
 295                 u64 qword;
 296
 297                 rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean);
 298                 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 299
 300                 /* This memory barrier is needed to keep us from reading
 301                  * any other fields out of the rx_desc until we have
 302                  * verified the descriptor has been written back.
 303                  */
 304                 dma_rmb();
 305
 306                 if (i40e_rx_is_programming_status(qword)) {
 307                         i40e_clean_programming_status(rx_ring,
 308                                                       rx_desc->raw.qword[0],
 309                                                       qword);
 310                         bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
 311                         xsk_buff_free(*bi);
 312                         *bi = NULL;
 313                         cleaned_count++;
 314                         i40e_inc_ntc(rx_ring);
 315                         continue;
 316                 }
 317
 318                 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
 319                        I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 320                 if (!size)
 321                         break;
 322
 323                 bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
 324                 (*bi)->data_end = (*bi)->data + size;
 325                 xsk_buff_dma_sync_for_cpu(*bi, rx_ring->xsk_pool);
 326
 327                 xdp_res = i40e_run_xdp_zc(rx_ring, *bi);
 328                 if (xdp_res) {
 329                         if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR))
 330                                 xdp_xmit |= xdp_res;
 331                         else
 332                                 xsk_buff_free(*bi);
 333
 334                         *bi = NULL;
 335                         total_rx_bytes += size;
 336                         total_rx_packets++;
 337
 338                         cleaned_count++;
 339                         i40e_inc_ntc(rx_ring);
 340                         continue;
 341                 }
 342
 343                 /* XDP_PASS path */
 344
 345                 /* NB! We are not checking for errors using
 346                  * i40e_test_staterr with
 347                  * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
 348                  * SBP is *not* set in PRT_SBPVSI (default not set).
 349                  */
 350                 skb = i40e_construct_skb_zc(rx_ring, *bi);
 351                 if (!skb) {
 352                         rx_ring->rx_stats.alloc_buff_failed++;
 353                         break;
 354                 }
 355
 356                 *bi = NULL;
 357                 cleaned_count++;
 358                 i40e_inc_ntc(rx_ring);
 359
 360                 if (eth_skb_pad(skb))
 361                         continue;
 362
 363                 total_rx_bytes += skb->len;
 364                 total_rx_packets++;
 365
 366                 i40e_process_skb_fields(rx_ring, rx_desc, skb);
 367                 napi_gro_receive(&rx_ring->q_vector->napi, skb);
 368         }
 369
 370         if (cleaned_count >= I40E_RX_BUFFER_WRITE)
 371                 failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
 372
 373         i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
 374         i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
 375
 376         if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
 377                 if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
 378                         xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
 379                 else
 380                         xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
 381
 382                 return (int)total_rx_packets;
 383         }
 384         return failure ? budget : (int)total_rx_packets;
 385 }
 386
 387 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 388                           unsigned int *total_bytes)
 389 {
 390         struct i40e_tx_desc *tx_desc;
 391         dma_addr_t dma;
 392
 393         dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
 394         xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
 395
 396         tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
 397         tx_desc->buffer_addr = cpu_to_le64(dma);
 398         tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP,
 399                                                   0, desc->len, 0);
 400
 401         *total_bytes += desc->len;
 402 }
 403
 404 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 405                                 unsigned int *total_bytes)
 406 {
 407         u16 ntu = xdp_ring->next_to_use;
 408         struct i40e_tx_desc *tx_desc;
 409         dma_addr_t dma;
 410         u32 i;
 411
 412         loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
 413                 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);
 414                 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);
 415
 416                 tx_desc = I40E_TX_DESC(xdp_ring, ntu++);
 417                 tx_desc->buffer_addr = cpu_to_le64(dma);
 418                 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC |
 419                                                           I40E_TX_DESC_CMD_EOP,
 420                                                           0, desc[i].len, 0);
 421
 422                 *total_bytes += desc[i].len;
 423         }
 424
 425         xdp_ring->next_to_use = ntu;
 426 }
 427
 428 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,
 429                                  unsigned int *total_bytes)
 430 {
 431         u32 batched, leftover, i;
 432
 433         batched = nb_pkts & ~(PKTS_PER_BATCH - 1);
 434         leftover = nb_pkts & (PKTS_PER_BATCH - 1);
 435         for (i = 0; i < batched; i += PKTS_PER_BATCH)
 436                 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
 437         for (i = batched; i < batched + leftover; i++)
 438                 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);
 439 }
 440
 441 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
 442 {
 443         u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
 444         struct i40e_tx_desc *tx_desc;
 445
 446         tx_desc = I40E_TX_DESC(xdp_ring, ntu);
 447         tx_desc->cmd_type_offset_bsz |= (I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
 448 }
 449
 450 /**
 451  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
 452  * @xdp_ring: XDP Tx ring
 453  * @budget: NAPI budget
 454  *
 455  * Returns true if the work is finished.
 456  **/
 457 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 458 {
 459         struct xdp_desc *descs = xdp_ring->xsk_descs;
 460         u32 nb_pkts, nb_processed = 0;
 461         unsigned int total_bytes = 0;
 462
 463         nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, descs, budget);
 464         if (!nb_pkts)
 465                 return false;
 466
 467         if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
 468                 nb_processed = xdp_ring->count - xdp_ring->next_to_use;
 469                 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
 470                 xdp_ring->next_to_use = 0;
 471         }
 472
 473         i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
 474                              &total_bytes);
 475
 476         /* Request an interrupt for the last frame and bump tail ptr. */
 477         i40e_set_rs_bit(xdp_ring);
 478         i40e_xdp_ring_update_tail(xdp_ring);
 479
 480         i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
 481
 482         return true;
 483 }
 484
 485 /**
 486  * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
 487  * @tx_ring: XDP Tx ring
 488  * @tx_bi: Tx buffer info to clean
 489  **/
 490 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
 491                                      struct i40e_tx_buffer *tx_bi)
 492 {
 493         xdp_return_frame(tx_bi->xdpf);
 494         tx_ring->xdp_tx_active--;
 495         dma_unmap_single(tx_ring->dev,
 496                          dma_unmap_addr(tx_bi, dma),
 497                          dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
 498         dma_unmap_len_set(tx_bi, len, 0);
 499 }
 500
 501 /**
 502  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
 503  * @vsi: Current VSI
 504  * @tx_ring: XDP Tx ring
 505  *
 506  * Returns true if cleanup/tranmission is done.
 507  **/
 508 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
 509 {
 510         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 511         u32 i, completed_frames, xsk_frames = 0;
 512         u32 head_idx = i40e_get_head(tx_ring);
 513         struct i40e_tx_buffer *tx_bi;
 514         unsigned int ntc;
 515
 516         if (head_idx < tx_ring->next_to_clean)
 517                 head_idx += tx_ring->count;
 518         completed_frames = head_idx - tx_ring->next_to_clean;
 519
 520         if (completed_frames == 0)
 521                 goto out_xmit;
 522
 523         if (likely(!tx_ring->xdp_tx_active)) {
 524                 xsk_frames = completed_frames;
 525                 goto skip;
 526         }
 527
 528         ntc = tx_ring->next_to_clean;
 529
 530         for (i = 0; i < completed_frames; i++) {
 531                 tx_bi = &tx_ring->tx_bi[ntc];
 532
 533                 if (tx_bi->xdpf) {
 534                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 535                         tx_bi->xdpf = NULL;
 536                 } else {
 537                         xsk_frames++;
 538                 }
 539
 540                 if (++ntc >= tx_ring->count)
 541                         ntc = 0;
 542         }
 543
 544 skip:
 545         tx_ring->next_to_clean += completed_frames;
 546         if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
 547                 tx_ring->next_to_clean -= tx_ring->count;
 548
 549         if (xsk_frames)
 550                 xsk_tx_completed(bp, xsk_frames);
 551
 552         i40e_arm_wb(tx_ring, vsi, completed_frames);
 553
 554 out_xmit:
 555         if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
 556                 xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
 557
 558         return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
 559 }
 560
 561 /**
 562  * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
 563  * @dev: the netdevice
 564  * @queue_id: queue id to wake up
 565  * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
 566  *
 567  * Returns <0 for errors, 0 otherwise.
 568  **/
 569 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
 570 {
 571         struct i40e_netdev_priv *np = netdev_priv(dev);
 572         struct i40e_vsi *vsi = np->vsi;
 573         struct i40e_pf *pf = vsi->back;
 574         struct i40e_ring *ring;
 575
 576         if (test_bit(__I40E_CONFIG_BUSY, pf->state))
 577                 return -EAGAIN;
 578
 579         if (test_bit(__I40E_VSI_DOWN, vsi->state))
 580                 return -ENETDOWN;
 581
 582         if (!i40e_enabled_xdp_vsi(vsi))
 583                 return -ENXIO;
 584
 585         if (queue_id >= vsi->num_queue_pairs)
 586                 return -ENXIO;
 587
 588         if (!vsi->xdp_rings[queue_id]->xsk_pool)
 589                 return -ENXIO;
 590
 591         ring = vsi->xdp_rings[queue_id];
 592
 593         /* The idea here is that if NAPI is running, mark a miss, so
 594          * it will run again. If not, trigger an interrupt and
 595          * schedule the NAPI from interrupt context. If NAPI would be
 596          * scheduled here, the interrupt affinity would not be
 597          * honored.
 598          */
 599         if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
 600                 i40e_force_wb(vsi, ring->q_vector);
 601
 602         return 0;
 603 }
 604
 605 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
 606 {
 607         u16 i;
 608
 609         for (i = 0; i < rx_ring->count; i++) {
 610                 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, i);
 611
 612                 if (!rx_bi)
 613                         continue;
 614
 615                 xsk_buff_free(rx_bi);
 616                 rx_bi = NULL;
 617         }
 618 }
 619
 620 /**
 621  * i40e_xsk_clean_xdp_ring - Clean the XDP Tx ring on shutdown
 622  * @tx_ring: XDP Tx ring
 623  **/
 624 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
 625 {
 626         u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
 627         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 628         struct i40e_tx_buffer *tx_bi;
 629         u32 xsk_frames = 0;
 630
 631         while (ntc != ntu) {
 632                 tx_bi = &tx_ring->tx_bi[ntc];
 633
 634                 if (tx_bi->xdpf)
 635                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 636                 else
 637                         xsk_frames++;
 638
 639                 tx_bi->xdpf = NULL;
 640
 641                 ntc++;
 642                 if (ntc >= tx_ring->count)
 643                         ntc = 0;
 644         }
 645
 646         if (xsk_frames)
 647                 xsk_tx_completed(bp, xsk_frames);
 648 }
 649
 650 /**
 651  * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
 652  * buffer pool attached
 653  * @vsi: vsi
 654  *
 655  * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
 656  **/
 657 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
 658 {
 659         struct net_device *netdev = vsi->netdev;
 660         int i;
 661
 662         for (i = 0; i < vsi->num_queue_pairs; i++) {
 663                 if (xsk_get_pool_from_qid(netdev, i))
 664                         return true;
 665         }
 666
 667         return false;
 668 }