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         if (likely(act == XDP_REDIRECT)) {
 164                 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
 165                 if (err)
 166                         goto out_failure;
 167                 rcu_read_unlock();
 168                 return I40E_XDP_REDIR;
 169         }
 170
 171         switch (act) {
 172         case XDP_PASS:
 173                 break;
 174         case XDP_TX:
 175                 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
 176                 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
 177                 if (result == I40E_XDP_CONSUMED)
 178                         goto out_failure;
 179                 break;
 180         default:
 181                 bpf_warn_invalid_xdp_action(act);
 182                 fallthrough;
 183         case XDP_ABORTED:
 184 out_failure:
 185                 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 186                 fallthrough; /* handle aborts by dropping packet */
 187         case XDP_DROP:
 188                 result = I40E_XDP_CONSUMED;
 189                 break;
 190         }
 191         rcu_read_unlock();
 192         return result;
 193 }
 194
 195 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 196 {
 197         u16 ntu = rx_ring->next_to_use;
 198         union i40e_rx_desc *rx_desc;
 199         struct xdp_buff **bi, *xdp;
 200         dma_addr_t dma;
 201         bool ok = true;
 202
 203         rx_desc = I40E_RX_DESC(rx_ring, ntu);
 204         bi = i40e_rx_bi(rx_ring, ntu);
 205         do {
 206                 xdp = xsk_buff_alloc(rx_ring->xsk_pool);
 207                 if (!xdp) {
 208                         ok = false;
 209                         goto no_buffers;
 210                 }
 211                 *bi = xdp;
 212                 dma = xsk_buff_xdp_get_dma(xdp);
 213                 rx_desc->read.pkt_addr = cpu_to_le64(dma);
 214                 rx_desc->read.hdr_addr = 0;
 215
 216                 rx_desc++;
 217                 bi++;
 218                 ntu++;
 219
 220                 if (unlikely(ntu == rx_ring->count)) {
 221                         rx_desc = I40E_RX_DESC(rx_ring, 0);
 222                         bi = i40e_rx_bi(rx_ring, 0);
 223                         ntu = 0;
 224                 }
 225         } while (--count);
 226
 227 no_buffers:
 228         if (rx_ring->next_to_use != ntu) {
 229                 /* clear the status bits for the next_to_use descriptor */
 230                 rx_desc->wb.qword1.status_error_len = 0;
 231                 i40e_release_rx_desc(rx_ring, ntu);
 232         }
 233
 234         return ok;
 235 }
 236
 237 /**
 238  * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
 239  * @rx_ring: Rx ring
 240  * @xdp: xdp_buff
 241  *
 242  * This functions allocates a new skb from a zero-copy Rx buffer.
 243  *
 244  * Returns the skb, or NULL on failure.
 245  **/
 246 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
 247                                              struct xdp_buff *xdp)
 248 {
 249         unsigned int metasize = xdp->data - xdp->data_meta;
 250         unsigned int datasize = xdp->data_end - xdp->data;
 251         struct sk_buff *skb;
 252
 253         /* allocate a skb to store the frags */
 254         skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
 255                                xdp->data_end - xdp->data_hard_start,
 256                                GFP_ATOMIC | __GFP_NOWARN);
 257         if (unlikely(!skb))
 258                 goto out;
 259
 260         skb_reserve(skb, xdp->data - xdp->data_hard_start);
 261         memcpy(__skb_put(skb, datasize), xdp->data, datasize);
 262         if (metasize)
 263                 skb_metadata_set(skb, metasize);
 264
 265 out:
 266         xsk_buff_free(xdp);
 267         return skb;
 268 }
 269
 270 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
 271                                       struct xdp_buff *xdp_buff,
 272                                       union i40e_rx_desc *rx_desc,
 273                                       unsigned int *rx_packets,
 274                                       unsigned int *rx_bytes,
 275                                       unsigned int size,
 276                                       unsigned int xdp_res)
 277 {
 278         struct sk_buff *skb;
 279
 280         *rx_packets = 1;
 281         *rx_bytes = size;
 282
 283         if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX)
 284                 return;
 285
 286         if (xdp_res == I40E_XDP_CONSUMED) {
 287                 xsk_buff_free(xdp_buff);
 288                 return;
 289         }
 290
 291         if (xdp_res == I40E_XDP_PASS) {
 292                 /* NB! We are not checking for errors using
 293                  * i40e_test_staterr with
 294                  * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
 295                  * SBP is *not* set in PRT_SBPVSI (default not set).
 296                  */
 297                 skb = i40e_construct_skb_zc(rx_ring, xdp_buff);
 298                 if (!skb) {
 299                         rx_ring->rx_stats.alloc_buff_failed++;
 300                         *rx_packets = 0;
 301                         *rx_bytes = 0;
 302                         return;
 303                 }
 304
 305                 if (eth_skb_pad(skb)) {
 306                         *rx_packets = 0;
 307                         *rx_bytes = 0;
 308                         return;
 309                 }
 310
 311                 *rx_bytes = skb->len;
 312                 i40e_process_skb_fields(rx_ring, rx_desc, skb);
 313                 napi_gro_receive(&rx_ring->q_vector->napi, skb);
 314                 return;
 315         }
 316
 317         /* Should never get here, as all valid cases have been handled already.
 318          */
 319         WARN_ON_ONCE(1);
 320 }
 321
 322 /**
 323  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
 324  * @rx_ring: Rx ring
 325  * @budget: NAPI budget
 326  *
 327  * Returns amount of work completed
 328  **/
 329 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 330 {
 331         unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 332         u16 cleaned_count = I40E_DESC_UNUSED(rx_ring);
 333         u16 next_to_clean = rx_ring->next_to_clean;
 334         u16 count_mask = rx_ring->count - 1;
 335         unsigned int xdp_res, xdp_xmit = 0;
 336         bool failure = false;
 337
 338         while (likely(total_rx_packets < (unsigned int)budget)) {
 339                 union i40e_rx_desc *rx_desc;
 340                 unsigned int rx_packets;
 341                 unsigned int rx_bytes;
 342                 struct xdp_buff *bi;
 343                 unsigned int size;
 344                 u64 qword;
 345
 346                 rx_desc = I40E_RX_DESC(rx_ring, next_to_clean);
 347                 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 348
 349                 /* This memory barrier is needed to keep us from reading
 350                  * any other fields out of the rx_desc until we have
 351                  * verified the descriptor has been written back.
 352                  */
 353                 dma_rmb();
 354
 355                 if (i40e_rx_is_programming_status(qword)) {
 356                         i40e_clean_programming_status(rx_ring,
 357                                                       rx_desc->raw.qword[0],
 358                                                       qword);
 359                         bi = *i40e_rx_bi(rx_ring, next_to_clean);
 360                         xsk_buff_free(bi);
 361                         next_to_clean = (next_to_clean + 1) & count_mask;
 362                         continue;
 363                 }
 364
 365                 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
 366                        I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 367                 if (!size)
 368                         break;
 369
 370                 bi = *i40e_rx_bi(rx_ring, next_to_clean);
 371                 bi->data_end = bi->data + size;
 372                 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool);
 373
 374                 xdp_res = i40e_run_xdp_zc(rx_ring, bi);
 375                 i40e_handle_xdp_result_zc(rx_ring, bi, rx_desc, &rx_packets,
 376                                           &rx_bytes, size, xdp_res);
 377                 total_rx_packets += rx_packets;
 378                 total_rx_bytes += rx_bytes;
 379                 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR);
 380                 next_to_clean = (next_to_clean + 1) & count_mask;
 381         }
 382
 383         rx_ring->next_to_clean = next_to_clean;
 384         cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask;
 385
 386         if (cleaned_count >= I40E_RX_BUFFER_WRITE)
 387                 failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
 388
 389         i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
 390         i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
 391
 392         if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
 393                 if (failure || next_to_clean == rx_ring->next_to_use)
 394                         xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
 395                 else
 396                         xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
 397
 398                 return (int)total_rx_packets;
 399         }
 400         return failure ? budget : (int)total_rx_packets;
 401 }
 402
 403 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 404                           unsigned int *total_bytes)
 405 {
 406         struct i40e_tx_desc *tx_desc;
 407         dma_addr_t dma;
 408
 409         dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
 410         xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
 411
 412         tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
 413         tx_desc->buffer_addr = cpu_to_le64(dma);
 414         tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP,
 415                                                   0, desc->len, 0);
 416
 417         *total_bytes += desc->len;
 418 }
 419
 420 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 421                                 unsigned int *total_bytes)
 422 {
 423         u16 ntu = xdp_ring->next_to_use;
 424         struct i40e_tx_desc *tx_desc;
 425         dma_addr_t dma;
 426         u32 i;
 427
 428         loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
 429                 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);
 430                 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);
 431
 432                 tx_desc = I40E_TX_DESC(xdp_ring, ntu++);
 433                 tx_desc->buffer_addr = cpu_to_le64(dma);
 434                 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC |
 435                                                           I40E_TX_DESC_CMD_EOP,
 436                                                           0, desc[i].len, 0);
 437
 438                 *total_bytes += desc[i].len;
 439         }
 440
 441         xdp_ring->next_to_use = ntu;
 442 }
 443
 444 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,
 445                                  unsigned int *total_bytes)
 446 {
 447         u32 batched, leftover, i;
 448
 449         batched = nb_pkts & ~(PKTS_PER_BATCH - 1);
 450         leftover = nb_pkts & (PKTS_PER_BATCH - 1);
 451         for (i = 0; i < batched; i += PKTS_PER_BATCH)
 452                 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
 453         for (i = batched; i < batched + leftover; i++)
 454                 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);
 455 }
 456
 457 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
 458 {
 459         u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
 460         struct i40e_tx_desc *tx_desc;
 461
 462         tx_desc = I40E_TX_DESC(xdp_ring, ntu);
 463         tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
 464 }
 465
 466 /**
 467  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
 468  * @xdp_ring: XDP Tx ring
 469  * @budget: NAPI budget
 470  *
 471  * Returns true if the work is finished.
 472  **/
 473 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 474 {
 475         struct xdp_desc *descs = xdp_ring->xsk_descs;
 476         u32 nb_pkts, nb_processed = 0;
 477         unsigned int total_bytes = 0;
 478
 479         nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, descs, budget);
 480         if (!nb_pkts)
 481                 return true;
 482
 483         if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
 484                 nb_processed = xdp_ring->count - xdp_ring->next_to_use;
 485                 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
 486                 xdp_ring->next_to_use = 0;
 487         }
 488
 489         i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
 490                              &total_bytes);
 491
 492         /* Request an interrupt for the last frame and bump tail ptr. */
 493         i40e_set_rs_bit(xdp_ring);
 494         i40e_xdp_ring_update_tail(xdp_ring);
 495
 496         i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
 497
 498         return nb_pkts < budget;
 499 }
 500
 501 /**
 502  * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
 503  * @tx_ring: XDP Tx ring
 504  * @tx_bi: Tx buffer info to clean
 505  **/
 506 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
 507                                      struct i40e_tx_buffer *tx_bi)
 508 {
 509         xdp_return_frame(tx_bi->xdpf);
 510         tx_ring->xdp_tx_active--;
 511         dma_unmap_single(tx_ring->dev,
 512                          dma_unmap_addr(tx_bi, dma),
 513                          dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
 514         dma_unmap_len_set(tx_bi, len, 0);
 515 }
 516
 517 /**
 518  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
 519  * @vsi: Current VSI
 520  * @tx_ring: XDP Tx ring
 521  *
 522  * Returns true if cleanup/tranmission is done.
 523  **/
 524 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
 525 {
 526         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 527         u32 i, completed_frames, xsk_frames = 0;
 528         u32 head_idx = i40e_get_head(tx_ring);
 529         struct i40e_tx_buffer *tx_bi;
 530         unsigned int ntc;
 531
 532         if (head_idx < tx_ring->next_to_clean)
 533                 head_idx += tx_ring->count;
 534         completed_frames = head_idx - tx_ring->next_to_clean;
 535
 536         if (completed_frames == 0)
 537                 goto out_xmit;
 538
 539         if (likely(!tx_ring->xdp_tx_active)) {
 540                 xsk_frames = completed_frames;
 541                 goto skip;
 542         }
 543
 544         ntc = tx_ring->next_to_clean;
 545
 546         for (i = 0; i < completed_frames; i++) {
 547                 tx_bi = &tx_ring->tx_bi[ntc];
 548
 549                 if (tx_bi->xdpf) {
 550                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 551                         tx_bi->xdpf = NULL;
 552                 } else {
 553                         xsk_frames++;
 554                 }
 555
 556                 if (++ntc >= tx_ring->count)
 557                         ntc = 0;
 558         }
 559
 560 skip:
 561         tx_ring->next_to_clean += completed_frames;
 562         if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
 563                 tx_ring->next_to_clean -= tx_ring->count;
 564
 565         if (xsk_frames)
 566                 xsk_tx_completed(bp, xsk_frames);
 567
 568         i40e_arm_wb(tx_ring, vsi, completed_frames);
 569
 570 out_xmit:
 571         if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
 572                 xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
 573
 574         return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
 575 }
 576
 577 /**
 578  * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
 579  * @dev: the netdevice
 580  * @queue_id: queue id to wake up
 581  * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
 582  *
 583  * Returns <0 for errors, 0 otherwise.
 584  **/
 585 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
 586 {
 587         struct i40e_netdev_priv *np = netdev_priv(dev);
 588         struct i40e_vsi *vsi = np->vsi;
 589         struct i40e_pf *pf = vsi->back;
 590         struct i40e_ring *ring;
 591
 592         if (test_bit(__I40E_CONFIG_BUSY, pf->state))
 593                 return -EAGAIN;
 594
 595         if (test_bit(__I40E_VSI_DOWN, vsi->state))
 596                 return -ENETDOWN;
 597
 598         if (!i40e_enabled_xdp_vsi(vsi))
 599                 return -ENXIO;
 600
 601         if (queue_id >= vsi->num_queue_pairs)
 602                 return -ENXIO;
 603
 604         if (!vsi->xdp_rings[queue_id]->xsk_pool)
 605                 return -ENXIO;
 606
 607         ring = vsi->xdp_rings[queue_id];
 608
 609         /* The idea here is that if NAPI is running, mark a miss, so
 610          * it will run again. If not, trigger an interrupt and
 611          * schedule the NAPI from interrupt context. If NAPI would be
 612          * scheduled here, the interrupt affinity would not be
 613          * honored.
 614          */
 615         if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
 616                 i40e_force_wb(vsi, ring->q_vector);
 617
 618         return 0;
 619 }
 620
 621 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
 622 {
 623         u16 count_mask = rx_ring->count - 1;
 624         u16 ntc = rx_ring->next_to_clean;
 625         u16 ntu = rx_ring->next_to_use;
 626
 627         for ( ; ntc != ntu; ntc = (ntc + 1)  & count_mask) {
 628                 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc);
 629
 630                 xsk_buff_free(rx_bi);
 631         }
 632 }
 633
 634 /**
 635  * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown
 636  * @tx_ring: XDP Tx ring
 637  **/
 638 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
 639 {
 640         u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
 641         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 642         struct i40e_tx_buffer *tx_bi;
 643         u32 xsk_frames = 0;
 644
 645         while (ntc != ntu) {
 646                 tx_bi = &tx_ring->tx_bi[ntc];
 647
 648                 if (tx_bi->xdpf)
 649                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 650                 else
 651                         xsk_frames++;
 652
 653                 tx_bi->xdpf = NULL;
 654
 655                 ntc++;
 656                 if (ntc >= tx_ring->count)
 657                         ntc = 0;
 658         }
 659
 660         if (xsk_frames)
 661                 xsk_tx_completed(bp, xsk_frames);
 662 }
 663
 664 /**
 665  * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
 666  * buffer pool attached
 667  * @vsi: vsi
 668  *
 669  * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
 670  **/
 671 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
 672 {
 673         struct net_device *netdev = vsi->netdev;
 674         int i;
 675
 676         for (i = 0; i < vsi->num_queue_pairs; i++) {
 677                 if (xsk_get_pool_from_qid(netdev, i))
 678                         return true;
 679         }
 680
 681         return false;
 682 }