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 /* NB! xdp_prog will always be !NULL, due to the fact that 157 * this path is enabled by setting an XDP program. 158 */ 159 xdp_prog = READ_ONCE(rx_ring->xdp_prog); 160 act = bpf_prog_run_xdp(xdp_prog, xdp); 161 162 if (likely(act == XDP_REDIRECT)) { 163 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); 164 if (err) 165 goto out_failure; 166 return I40E_XDP_REDIR; 167 } 168 169 switch (act) { 170 case XDP_PASS: 171 break; 172 case XDP_TX: 173 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; 174 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring); 175 if (result == I40E_XDP_CONSUMED) 176 goto out_failure; 177 break; 178 default: 179 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); 180 fallthrough; 181 case XDP_ABORTED: 182 out_failure: 183 trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 184 fallthrough; /* handle aborts by dropping packet */ 185 case XDP_DROP: 186 result = I40E_XDP_CONSUMED; 187 break; 188 } 189 return result; 190 } 191 192 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) 193 { 194 u16 ntu = rx_ring->next_to_use; 195 union i40e_rx_desc *rx_desc; 196 struct xdp_buff **xdp; 197 u32 nb_buffs, i; 198 dma_addr_t dma; 199 200 rx_desc = I40E_RX_DESC(rx_ring, ntu); 201 xdp = i40e_rx_bi(rx_ring, ntu); 202 203 nb_buffs = min_t(u16, count, rx_ring->count - ntu); 204 nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs); 205 if (!nb_buffs) 206 return false; 207 208 i = nb_buffs; 209 while (i--) { 210 dma = xsk_buff_xdp_get_dma(*xdp); 211 rx_desc->read.pkt_addr = cpu_to_le64(dma); 212 rx_desc->read.hdr_addr = 0; 213 214 rx_desc++; 215 xdp++; 216 } 217 218 ntu += nb_buffs; 219 if (ntu == rx_ring->count) { 220 rx_desc = I40E_RX_DESC(rx_ring, 0); 221 ntu = 0; 222 } 223 224 /* 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 return count == nb_buffs; 229 } 230 231 /** 232 * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer 233 * @rx_ring: Rx ring 234 * @xdp: xdp_buff 235 * 236 * This functions allocates a new skb from a zero-copy Rx buffer. 237 * 238 * Returns the skb, or NULL on failure. 239 **/ 240 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, 241 struct xdp_buff *xdp) 242 { 243 unsigned int totalsize = xdp->data_end - xdp->data_meta; 244 unsigned int metasize = xdp->data - xdp->data_meta; 245 struct sk_buff *skb; 246 247 net_prefetch(xdp->data_meta); 248 249 /* allocate a skb to store the frags */ 250 skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, 251 GFP_ATOMIC | __GFP_NOWARN); 252 if (unlikely(!skb)) 253 goto out; 254 255 memcpy(__skb_put(skb, totalsize), xdp->data_meta, 256 ALIGN(totalsize, sizeof(long))); 257 258 if (metasize) { 259 skb_metadata_set(skb, metasize); 260 __skb_pull(skb, metasize); 261 } 262 263 out: 264 xsk_buff_free(xdp); 265 return skb; 266 } 267 268 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, 269 struct xdp_buff *xdp_buff, 270 union i40e_rx_desc *rx_desc, 271 unsigned int *rx_packets, 272 unsigned int *rx_bytes, 273 unsigned int size, 274 unsigned int xdp_res) 275 { 276 struct sk_buff *skb; 277 278 *rx_packets = 1; 279 *rx_bytes = size; 280 281 if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX) 282 return; 283 284 if (xdp_res == I40E_XDP_CONSUMED) { 285 xsk_buff_free(xdp_buff); 286 return; 287 } 288 289 if (xdp_res == I40E_XDP_PASS) { 290 /* NB! We are not checking for errors using 291 * i40e_test_staterr with 292 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that 293 * SBP is *not* set in PRT_SBPVSI (default not set). 294 */ 295 skb = i40e_construct_skb_zc(rx_ring, xdp_buff); 296 if (!skb) { 297 rx_ring->rx_stats.alloc_buff_failed++; 298 *rx_packets = 0; 299 *rx_bytes = 0; 300 return; 301 } 302 303 if (eth_skb_pad(skb)) { 304 *rx_packets = 0; 305 *rx_bytes = 0; 306 return; 307 } 308 309 *rx_bytes = skb->len; 310 i40e_process_skb_fields(rx_ring, rx_desc, skb); 311 napi_gro_receive(&rx_ring->q_vector->napi, skb); 312 return; 313 } 314 315 /* Should never get here, as all valid cases have been handled already. 316 */ 317 WARN_ON_ONCE(1); 318 } 319 320 /** 321 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring 322 * @rx_ring: Rx ring 323 * @budget: NAPI budget 324 * 325 * Returns amount of work completed 326 **/ 327 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) 328 { 329 unsigned int total_rx_bytes = 0, total_rx_packets = 0; 330 u16 next_to_clean = rx_ring->next_to_clean; 331 u16 count_mask = rx_ring->count - 1; 332 unsigned int xdp_res, xdp_xmit = 0; 333 bool failure = false; 334 u16 cleaned_count; 335 336 while (likely(total_rx_packets < (unsigned int)budget)) { 337 union i40e_rx_desc *rx_desc; 338 unsigned int rx_packets; 339 unsigned int rx_bytes; 340 struct xdp_buff *bi; 341 unsigned int size; 342 u64 qword; 343 344 rx_desc = I40E_RX_DESC(rx_ring, next_to_clean); 345 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); 346 347 /* This memory barrier is needed to keep us from reading 348 * any other fields out of the rx_desc until we have 349 * verified the descriptor has been written back. 350 */ 351 dma_rmb(); 352 353 if (i40e_rx_is_programming_status(qword)) { 354 i40e_clean_programming_status(rx_ring, 355 rx_desc->raw.qword[0], 356 qword); 357 bi = *i40e_rx_bi(rx_ring, next_to_clean); 358 xsk_buff_free(bi); 359 next_to_clean = (next_to_clean + 1) & count_mask; 360 continue; 361 } 362 363 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> 364 I40E_RXD_QW1_LENGTH_PBUF_SHIFT; 365 if (!size) 366 break; 367 368 bi = *i40e_rx_bi(rx_ring, next_to_clean); 369 xsk_buff_set_size(bi, size); 370 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool); 371 372 xdp_res = i40e_run_xdp_zc(rx_ring, bi); 373 i40e_handle_xdp_result_zc(rx_ring, bi, rx_desc, &rx_packets, 374 &rx_bytes, size, xdp_res); 375 total_rx_packets += rx_packets; 376 total_rx_bytes += rx_bytes; 377 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR); 378 next_to_clean = (next_to_clean + 1) & count_mask; 379 } 380 381 rx_ring->next_to_clean = next_to_clean; 382 cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask; 383 384 if (cleaned_count >= I40E_RX_BUFFER_WRITE) 385 failure = !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count); 386 387 i40e_finalize_xdp_rx(rx_ring, xdp_xmit); 388 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); 389 390 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { 391 if (failure || next_to_clean == rx_ring->next_to_use) 392 xsk_set_rx_need_wakeup(rx_ring->xsk_pool); 393 else 394 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); 395 396 return (int)total_rx_packets; 397 } 398 return failure ? budget : (int)total_rx_packets; 399 } 400 401 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 402 unsigned int *total_bytes) 403 { 404 struct i40e_tx_desc *tx_desc; 405 dma_addr_t dma; 406 407 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr); 408 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len); 409 410 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++); 411 tx_desc->buffer_addr = cpu_to_le64(dma); 412 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP, 413 0, desc->len, 0); 414 415 *total_bytes += desc->len; 416 } 417 418 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 419 unsigned int *total_bytes) 420 { 421 u16 ntu = xdp_ring->next_to_use; 422 struct i40e_tx_desc *tx_desc; 423 dma_addr_t dma; 424 u32 i; 425 426 loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { 427 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr); 428 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len); 429 430 tx_desc = I40E_TX_DESC(xdp_ring, ntu++); 431 tx_desc->buffer_addr = cpu_to_le64(dma); 432 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | 433 I40E_TX_DESC_CMD_EOP, 434 0, desc[i].len, 0); 435 436 *total_bytes += desc[i].len; 437 } 438 439 xdp_ring->next_to_use = ntu; 440 } 441 442 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, 443 unsigned int *total_bytes) 444 { 445 u32 batched, leftover, i; 446 447 batched = nb_pkts & ~(PKTS_PER_BATCH - 1); 448 leftover = nb_pkts & (PKTS_PER_BATCH - 1); 449 for (i = 0; i < batched; i += PKTS_PER_BATCH) 450 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); 451 for (i = batched; i < batched + leftover; i++) 452 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes); 453 } 454 455 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring) 456 { 457 u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; 458 struct i40e_tx_desc *tx_desc; 459 460 tx_desc = I40E_TX_DESC(xdp_ring, ntu); 461 tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT); 462 } 463 464 /** 465 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP 466 * @xdp_ring: XDP Tx ring 467 * @budget: NAPI budget 468 * 469 * Returns true if the work is finished. 470 **/ 471 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) 472 { 473 struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; 474 u32 nb_pkts, nb_processed = 0; 475 unsigned int total_bytes = 0; 476 477 nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget); 478 if (!nb_pkts) 479 return true; 480 481 if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) { 482 nb_processed = xdp_ring->count - xdp_ring->next_to_use; 483 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); 484 xdp_ring->next_to_use = 0; 485 } 486 487 i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, 488 &total_bytes); 489 490 /* Request an interrupt for the last frame and bump tail ptr. */ 491 i40e_set_rs_bit(xdp_ring); 492 i40e_xdp_ring_update_tail(xdp_ring); 493 494 i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes); 495 496 return nb_pkts < budget; 497 } 498 499 /** 500 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry 501 * @tx_ring: XDP Tx ring 502 * @tx_bi: Tx buffer info to clean 503 **/ 504 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring, 505 struct i40e_tx_buffer *tx_bi) 506 { 507 xdp_return_frame(tx_bi->xdpf); 508 tx_ring->xdp_tx_active--; 509 dma_unmap_single(tx_ring->dev, 510 dma_unmap_addr(tx_bi, dma), 511 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); 512 dma_unmap_len_set(tx_bi, len, 0); 513 } 514 515 /** 516 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries 517 * @vsi: Current VSI 518 * @tx_ring: XDP Tx ring 519 * 520 * Returns true if cleanup/tranmission is done. 521 **/ 522 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring) 523 { 524 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 525 u32 i, completed_frames, xsk_frames = 0; 526 u32 head_idx = i40e_get_head(tx_ring); 527 struct i40e_tx_buffer *tx_bi; 528 unsigned int ntc; 529 530 if (head_idx < tx_ring->next_to_clean) 531 head_idx += tx_ring->count; 532 completed_frames = head_idx - tx_ring->next_to_clean; 533 534 if (completed_frames == 0) 535 goto out_xmit; 536 537 if (likely(!tx_ring->xdp_tx_active)) { 538 xsk_frames = completed_frames; 539 goto skip; 540 } 541 542 ntc = tx_ring->next_to_clean; 543 544 for (i = 0; i < completed_frames; i++) { 545 tx_bi = &tx_ring->tx_bi[ntc]; 546 547 if (tx_bi->xdpf) { 548 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 549 tx_bi->xdpf = NULL; 550 } else { 551 xsk_frames++; 552 } 553 554 if (++ntc >= tx_ring->count) 555 ntc = 0; 556 } 557 558 skip: 559 tx_ring->next_to_clean += completed_frames; 560 if (unlikely(tx_ring->next_to_clean >= tx_ring->count)) 561 tx_ring->next_to_clean -= tx_ring->count; 562 563 if (xsk_frames) 564 xsk_tx_completed(bp, xsk_frames); 565 566 i40e_arm_wb(tx_ring, vsi, completed_frames); 567 568 out_xmit: 569 if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) 570 xsk_set_tx_need_wakeup(tx_ring->xsk_pool); 571 572 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring)); 573 } 574 575 /** 576 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup 577 * @dev: the netdevice 578 * @queue_id: queue id to wake up 579 * @flags: ignored in our case since we have Rx and Tx in the same NAPI. 580 * 581 * Returns <0 for errors, 0 otherwise. 582 **/ 583 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) 584 { 585 struct i40e_netdev_priv *np = netdev_priv(dev); 586 struct i40e_vsi *vsi = np->vsi; 587 struct i40e_pf *pf = vsi->back; 588 struct i40e_ring *ring; 589 590 if (test_bit(__I40E_CONFIG_BUSY, pf->state)) 591 return -EAGAIN; 592 593 if (test_bit(__I40E_VSI_DOWN, vsi->state)) 594 return -ENETDOWN; 595 596 if (!i40e_enabled_xdp_vsi(vsi)) 597 return -ENXIO; 598 599 if (queue_id >= vsi->num_queue_pairs) 600 return -ENXIO; 601 602 if (!vsi->xdp_rings[queue_id]->xsk_pool) 603 return -ENXIO; 604 605 ring = vsi->xdp_rings[queue_id]; 606 607 /* The idea here is that if NAPI is running, mark a miss, so 608 * it will run again. If not, trigger an interrupt and 609 * schedule the NAPI from interrupt context. If NAPI would be 610 * scheduled here, the interrupt affinity would not be 611 * honored. 612 */ 613 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) 614 i40e_force_wb(vsi, ring->q_vector); 615 616 return 0; 617 } 618 619 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring) 620 { 621 u16 count_mask = rx_ring->count - 1; 622 u16 ntc = rx_ring->next_to_clean; 623 u16 ntu = rx_ring->next_to_use; 624 625 for ( ; ntc != ntu; ntc = (ntc + 1) & count_mask) { 626 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc); 627 628 xsk_buff_free(rx_bi); 629 } 630 } 631 632 /** 633 * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown 634 * @tx_ring: XDP Tx ring 635 **/ 636 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring) 637 { 638 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; 639 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 640 struct i40e_tx_buffer *tx_bi; 641 u32 xsk_frames = 0; 642 643 while (ntc != ntu) { 644 tx_bi = &tx_ring->tx_bi[ntc]; 645 646 if (tx_bi->xdpf) 647 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 648 else 649 xsk_frames++; 650 651 tx_bi->xdpf = NULL; 652 653 ntc++; 654 if (ntc >= tx_ring->count) 655 ntc = 0; 656 } 657 658 if (xsk_frames) 659 xsk_tx_completed(bp, xsk_frames); 660 } 661 662 /** 663 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP 664 * buffer pool attached 665 * @vsi: vsi 666 * 667 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached 668 **/ 669 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi) 670 { 671 struct net_device *netdev = vsi->netdev; 672 int i; 673 674 for (i = 0; i < vsi->num_queue_pairs; i++) { 675 if (xsk_get_pool_from_qid(netdev, i)) 676 return true; 677 } 678 679 return false; 680 } 681