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