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 } 695