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  * @xdp_prog: XDP program to run
 147  *
 148  * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
 149  **/
 150 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp,
 151                            struct bpf_prog *xdp_prog)
 152 {
 153         int err, result = I40E_XDP_PASS;
 154         struct i40e_ring *xdp_ring;
 155         u32 act;
 156
 157         act = bpf_prog_run_xdp(xdp_prog, xdp);
 158
 159         if (likely(act == XDP_REDIRECT)) {
 160                 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
 161                 if (!err)
 162                         return I40E_XDP_REDIR;
 163                 if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS)
 164                         result = I40E_XDP_EXIT;
 165                 else
 166                         result = I40E_XDP_CONSUMED;
 167                 goto out_failure;
 168         }
 169
 170         switch (act) {
 171         case XDP_PASS:
 172                 break;
 173         case XDP_TX:
 174                 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index];
 175                 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring);
 176                 if (result == I40E_XDP_CONSUMED)
 177                         goto out_failure;
 178                 break;
 179         case XDP_DROP:
 180                 result = I40E_XDP_CONSUMED;
 181                 break;
 182         default:
 183                 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
 184                 fallthrough;
 185         case XDP_ABORTED:
 186                 result = I40E_XDP_CONSUMED;
 187 out_failure:
 188                 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
 189         }
 190         return result;
 191 }
 192
 193 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 194 {
 195         u16 ntu = rx_ring->next_to_use;
 196         union i40e_rx_desc *rx_desc;
 197         struct xdp_buff **xdp;
 198         u32 nb_buffs, i;
 199         dma_addr_t dma;
 200
 201         rx_desc = I40E_RX_DESC(rx_ring, ntu);
 202         xdp = i40e_rx_bi(rx_ring, ntu);
 203
 204         nb_buffs = min_t(u16, count, rx_ring->count - ntu);
 205         nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs);
 206         if (!nb_buffs)
 207                 return false;
 208
 209         i = nb_buffs;
 210         while (i--) {
 211                 dma = xsk_buff_xdp_get_dma(*xdp);
 212                 rx_desc->read.pkt_addr = cpu_to_le64(dma);
 213                 rx_desc->read.hdr_addr = 0;
 214
 215                 rx_desc++;
 216                 xdp++;
 217         }
 218
 219         ntu += nb_buffs;
 220         if (ntu == rx_ring->count) {
 221                 rx_desc = I40E_RX_DESC(rx_ring, 0);
 222                 ntu = 0;
 223         }
 224
 225         /* clear the status bits for the next_to_use descriptor */
 226         rx_desc->wb.qword1.status_error_len = 0;
 227         i40e_release_rx_desc(rx_ring, ntu);
 228
 229         return count == nb_buffs;
 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 totalsize = xdp->data_end - xdp->data_meta;
 245         unsigned int metasize = xdp->data - xdp->data_meta;
 246         struct sk_buff *skb;
 247
 248         net_prefetch(xdp->data_meta);
 249
 250         /* allocate a skb to store the frags */
 251         skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize,
 252                                GFP_ATOMIC | __GFP_NOWARN);
 253         if (unlikely(!skb))
 254                 goto out;
 255
 256         memcpy(__skb_put(skb, totalsize), xdp->data_meta,
 257                ALIGN(totalsize, sizeof(long)));
 258
 259         if (metasize) {
 260                 skb_metadata_set(skb, metasize);
 261                 __skb_pull(skb, metasize);
 262         }
 263
 264 out:
 265         xsk_buff_free(xdp);
 266         return skb;
 267 }
 268
 269 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
 270                                       struct xdp_buff *xdp_buff,
 271                                       union i40e_rx_desc *rx_desc,
 272                                       unsigned int *rx_packets,
 273                                       unsigned int *rx_bytes,
 274                                       unsigned int size,
 275                                       unsigned int xdp_res,
 276                                       bool *failure)
 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_EXIT) {
 287                 *failure = true;
 288                 return;
 289         }
 290
 291         if (xdp_res == I40E_XDP_CONSUMED) {
 292                 xsk_buff_free(xdp_buff);
 293                 return;
 294         }
 295         if (xdp_res == I40E_XDP_PASS) {
 296                 /* NB! We are not checking for errors using
 297                  * i40e_test_staterr with
 298                  * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
 299                  * SBP is *not* set in PRT_SBPVSI (default not set).
 300                  */
 301                 skb = i40e_construct_skb_zc(rx_ring, xdp_buff);
 302                 if (!skb) {
 303                         rx_ring->rx_stats.alloc_buff_failed++;
 304                         *rx_packets = 0;
 305                         *rx_bytes = 0;
 306                         return;
 307                 }
 308
 309                 if (eth_skb_pad(skb)) {
 310                         *rx_packets = 0;
 311                         *rx_bytes = 0;
 312                         return;
 313                 }
 314
 315                 *rx_bytes = skb->len;
 316                 i40e_process_skb_fields(rx_ring, rx_desc, skb);
 317                 napi_gro_receive(&rx_ring->q_vector->napi, skb);
 318                 return;
 319         }
 320
 321         /* Should never get here, as all valid cases have been handled already.
 322          */
 323         WARN_ON_ONCE(1);
 324 }
 325
 326 /**
 327  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
 328  * @rx_ring: Rx ring
 329  * @budget: NAPI budget
 330  *
 331  * Returns amount of work completed
 332  **/
 333 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 334 {
 335         unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 336         u16 next_to_clean = rx_ring->next_to_clean;
 337         u16 count_mask = rx_ring->count - 1;
 338         unsigned int xdp_res, xdp_xmit = 0;
 339         struct bpf_prog *xdp_prog;
 340         bool failure = false;
 341         u16 cleaned_count;
 342
 343         /* NB! xdp_prog will always be !NULL, due to the fact that
 344          * this path is enabled by setting an XDP program.
 345          */
 346         xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 347
 348         while (likely(total_rx_packets < (unsigned int)budget)) {
 349                 union i40e_rx_desc *rx_desc;
 350                 unsigned int rx_packets;
 351                 unsigned int rx_bytes;
 352                 struct xdp_buff *bi;
 353                 unsigned int size;
 354                 u64 qword;
 355
 356                 rx_desc = I40E_RX_DESC(rx_ring, next_to_clean);
 357                 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 358
 359                 /* This memory barrier is needed to keep us from reading
 360                  * any other fields out of the rx_desc until we have
 361                  * verified the descriptor has been written back.
 362                  */
 363                 dma_rmb();
 364
 365                 if (i40e_rx_is_programming_status(qword)) {
 366                         i40e_clean_programming_status(rx_ring,
 367                                                       rx_desc->raw.qword[0],
 368                                                       qword);
 369                         bi = *i40e_rx_bi(rx_ring, next_to_clean);
 370                         xsk_buff_free(bi);
 371                         next_to_clean = (next_to_clean + 1) & count_mask;
 372                         continue;
 373                 }
 374
 375                 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
 376                        I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 377                 if (!size)
 378                         break;
 379
 380                 bi = *i40e_rx_bi(rx_ring, next_to_clean);
 381                 xsk_buff_set_size(bi, size);
 382                 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool);
 383
 384                 xdp_res = i40e_run_xdp_zc(rx_ring, bi, xdp_prog);
 385                 i40e_handle_xdp_result_zc(rx_ring, bi, rx_desc, &rx_packets,
 386                                           &rx_bytes, size, xdp_res, &failure);
 387                 if (failure)
 388                         break;
 389                 total_rx_packets += rx_packets;
 390                 total_rx_bytes += rx_bytes;
 391                 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR);
 392                 next_to_clean = (next_to_clean + 1) & count_mask;
 393         }
 394
 395         rx_ring->next_to_clean = next_to_clean;
 396         cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask;
 397
 398         if (cleaned_count >= I40E_RX_BUFFER_WRITE)
 399                 failure |= !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count);
 400
 401         i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
 402         i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
 403
 404         if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
 405                 if (failure || next_to_clean == rx_ring->next_to_use)
 406                         xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
 407                 else
 408                         xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
 409
 410                 return (int)total_rx_packets;
 411         }
 412         return failure ? budget : (int)total_rx_packets;
 413 }
 414
 415 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 416                           unsigned int *total_bytes)
 417 {
 418         struct i40e_tx_desc *tx_desc;
 419         dma_addr_t dma;
 420
 421         dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
 422         xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
 423
 424         tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
 425         tx_desc->buffer_addr = cpu_to_le64(dma);
 426         tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP,
 427                                                   0, desc->len, 0);
 428
 429         *total_bytes += desc->len;
 430 }
 431
 432 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,
 433                                 unsigned int *total_bytes)
 434 {
 435         u16 ntu = xdp_ring->next_to_use;
 436         struct i40e_tx_desc *tx_desc;
 437         dma_addr_t dma;
 438         u32 i;
 439
 440         loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
 441                 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);
 442                 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);
 443
 444                 tx_desc = I40E_TX_DESC(xdp_ring, ntu++);
 445                 tx_desc->buffer_addr = cpu_to_le64(dma);
 446                 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC |
 447                                                           I40E_TX_DESC_CMD_EOP,
 448                                                           0, desc[i].len, 0);
 449
 450                 *total_bytes += desc[i].len;
 451         }
 452
 453         xdp_ring->next_to_use = ntu;
 454 }
 455
 456 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,
 457                                  unsigned int *total_bytes)
 458 {
 459         u32 batched, leftover, i;
 460
 461         batched = nb_pkts & ~(PKTS_PER_BATCH - 1);
 462         leftover = nb_pkts & (PKTS_PER_BATCH - 1);
 463         for (i = 0; i < batched; i += PKTS_PER_BATCH)
 464                 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
 465         for (i = batched; i < batched + leftover; i++)
 466                 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);
 467 }
 468
 469 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)
 470 {
 471         u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
 472         struct i40e_tx_desc *tx_desc;
 473
 474         tx_desc = I40E_TX_DESC(xdp_ring, ntu);
 475         tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);
 476 }
 477
 478 /**
 479  * i40e_xmit_zc - Performs zero-copy Tx AF_XDP
 480  * @xdp_ring: XDP Tx ring
 481  * @budget: NAPI budget
 482  *
 483  * Returns true if the work is finished.
 484  **/
 485 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 486 {
 487         struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
 488         u32 nb_pkts, nb_processed = 0;
 489         unsigned int total_bytes = 0;
 490
 491         nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
 492         if (!nb_pkts)
 493                 return true;
 494
 495         if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
 496                 nb_processed = xdp_ring->count - xdp_ring->next_to_use;
 497                 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
 498                 xdp_ring->next_to_use = 0;
 499         }
 500
 501         i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
 502                              &total_bytes);
 503
 504         /* Request an interrupt for the last frame and bump tail ptr. */
 505         i40e_set_rs_bit(xdp_ring);
 506         i40e_xdp_ring_update_tail(xdp_ring);
 507
 508         i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);
 509
 510         return nb_pkts < budget;
 511 }
 512
 513 /**
 514  * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry
 515  * @tx_ring: XDP Tx ring
 516  * @tx_bi: Tx buffer info to clean
 517  **/
 518 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,
 519                                      struct i40e_tx_buffer *tx_bi)
 520 {
 521         xdp_return_frame(tx_bi->xdpf);
 522         tx_ring->xdp_tx_active--;
 523         dma_unmap_single(tx_ring->dev,
 524                          dma_unmap_addr(tx_bi, dma),
 525                          dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);
 526         dma_unmap_len_set(tx_bi, len, 0);
 527 }
 528
 529 /**
 530  * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries
 531  * @vsi: Current VSI
 532  * @tx_ring: XDP Tx ring
 533  *
 534  * Returns true if cleanup/tranmission is done.
 535  **/
 536 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)
 537 {
 538         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 539         u32 i, completed_frames, xsk_frames = 0;
 540         u32 head_idx = i40e_get_head(tx_ring);
 541         struct i40e_tx_buffer *tx_bi;
 542         unsigned int ntc;
 543
 544         if (head_idx < tx_ring->next_to_clean)
 545                 head_idx += tx_ring->count;
 546         completed_frames = head_idx - tx_ring->next_to_clean;
 547
 548         if (completed_frames == 0)
 549                 goto out_xmit;
 550
 551         if (likely(!tx_ring->xdp_tx_active)) {
 552                 xsk_frames = completed_frames;
 553                 goto skip;
 554         }
 555
 556         ntc = tx_ring->next_to_clean;
 557
 558         for (i = 0; i < completed_frames; i++) {
 559                 tx_bi = &tx_ring->tx_bi[ntc];
 560
 561                 if (tx_bi->xdpf) {
 562                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 563                         tx_bi->xdpf = NULL;
 564                 } else {
 565                         xsk_frames++;
 566                 }
 567
 568                 if (++ntc >= tx_ring->count)
 569                         ntc = 0;
 570         }
 571
 572 skip:
 573         tx_ring->next_to_clean += completed_frames;
 574         if (unlikely(tx_ring->next_to_clean >= tx_ring->count))
 575                 tx_ring->next_to_clean -= tx_ring->count;
 576
 577         if (xsk_frames)
 578                 xsk_tx_completed(bp, xsk_frames);
 579
 580         i40e_arm_wb(tx_ring, vsi, completed_frames);
 581
 582 out_xmit:
 583         if (xsk_uses_need_wakeup(tx_ring->xsk_pool))
 584                 xsk_set_tx_need_wakeup(tx_ring->xsk_pool);
 585
 586         return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));
 587 }
 588
 589 /**
 590  * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup
 591  * @dev: the netdevice
 592  * @queue_id: queue id to wake up
 593  * @flags: ignored in our case since we have Rx and Tx in the same NAPI.
 594  *
 595  * Returns <0 for errors, 0 otherwise.
 596  **/
 597 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
 598 {
 599         struct i40e_netdev_priv *np = netdev_priv(dev);
 600         struct i40e_vsi *vsi = np->vsi;
 601         struct i40e_pf *pf = vsi->back;
 602         struct i40e_ring *ring;
 603
 604         if (test_bit(__I40E_CONFIG_BUSY, pf->state))
 605                 return -EAGAIN;
 606
 607         if (test_bit(__I40E_VSI_DOWN, vsi->state))
 608                 return -ENETDOWN;
 609
 610         if (!i40e_enabled_xdp_vsi(vsi))
 611                 return -EINVAL;
 612
 613         if (queue_id >= vsi->num_queue_pairs)
 614                 return -EINVAL;
 615
 616         if (!vsi->xdp_rings[queue_id]->xsk_pool)
 617                 return -EINVAL;
 618
 619         ring = vsi->xdp_rings[queue_id];
 620
 621         /* The idea here is that if NAPI is running, mark a miss, so
 622          * it will run again. If not, trigger an interrupt and
 623          * schedule the NAPI from interrupt context. If NAPI would be
 624          * scheduled here, the interrupt affinity would not be
 625          * honored.
 626          */
 627         if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))
 628                 i40e_force_wb(vsi, ring->q_vector);
 629
 630         return 0;
 631 }
 632
 633 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
 634 {
 635         u16 count_mask = rx_ring->count - 1;
 636         u16 ntc = rx_ring->next_to_clean;
 637         u16 ntu = rx_ring->next_to_use;
 638
 639         for ( ; ntc != ntu; ntc = (ntc + 1)  & count_mask) {
 640                 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc);
 641
 642                 xsk_buff_free(rx_bi);
 643         }
 644 }
 645
 646 /**
 647  * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown
 648  * @tx_ring: XDP Tx ring
 649  **/
 650 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
 651 {
 652         u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;
 653         struct xsk_buff_pool *bp = tx_ring->xsk_pool;
 654         struct i40e_tx_buffer *tx_bi;
 655         u32 xsk_frames = 0;
 656
 657         while (ntc != ntu) {
 658                 tx_bi = &tx_ring->tx_bi[ntc];
 659
 660                 if (tx_bi->xdpf)
 661                         i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);
 662                 else
 663                         xsk_frames++;
 664
 665                 tx_bi->xdpf = NULL;
 666
 667                 ntc++;
 668                 if (ntc >= tx_ring->count)
 669                         ntc = 0;
 670         }
 671
 672         if (xsk_frames)
 673                 xsk_tx_completed(bp, xsk_frames);
 674 }
 675
 676 /**
 677  * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP
 678  * buffer pool attached
 679  * @vsi: vsi
 680  *
 681  * Returns true if any of the Rx rings has an AF_XDP buffer pool attached
 682  **/
 683 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
 684 {
 685         struct net_device *netdev = vsi->netdev;
 686         int i;
 687
 688         for (i = 0; i < vsi->num_queue_pairs; i++) {
 689                 if (xsk_get_pool_from_qid(netdev, i))
 690                         return true;
 691         }
 692
 693         return false;
 694 }