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 void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring) 14 { 15 memset(rx_ring->rx_bi_zc, 0, 16 sizeof(*rx_ring->rx_bi_zc) * rx_ring->count); 17 } 18 19 static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx) 20 { 21 return &rx_ring->rx_bi_zc[idx]; 22 } 23 24 /** 25 * i40e_realloc_rx_xdp_bi - reallocate SW ring for either XSK or normal buffer 26 * @rx_ring: Current rx ring 27 * @pool_present: is pool for XSK present 28 * 29 * Try allocating memory and return ENOMEM, if failed to allocate. 30 * If allocation was successful, substitute buffer with allocated one. 31 * Returns 0 on success, negative on failure 32 */ 33 static int i40e_realloc_rx_xdp_bi(struct i40e_ring *rx_ring, bool pool_present) 34 { 35 size_t elem_size = pool_present ? sizeof(*rx_ring->rx_bi_zc) : 36 sizeof(*rx_ring->rx_bi); 37 void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL); 38 39 if (!sw_ring) 40 return -ENOMEM; 41 42 if (pool_present) { 43 kfree(rx_ring->rx_bi); 44 rx_ring->rx_bi = NULL; 45 rx_ring->rx_bi_zc = sw_ring; 46 } else { 47 kfree(rx_ring->rx_bi_zc); 48 rx_ring->rx_bi_zc = NULL; 49 rx_ring->rx_bi = sw_ring; 50 } 51 return 0; 52 } 53 54 /** 55 * i40e_realloc_rx_bi_zc - reallocate rx SW rings 56 * @vsi: Current VSI 57 * @zc: is zero copy set 58 * 59 * Reallocate buffer for rx_rings that might be used by XSK. 60 * XDP requires more memory, than rx_buf provides. 61 * Returns 0 on success, negative on failure 62 */ 63 int i40e_realloc_rx_bi_zc(struct i40e_vsi *vsi, bool zc) 64 { 65 struct i40e_ring *rx_ring; 66 unsigned long q; 67 68 for_each_set_bit(q, vsi->af_xdp_zc_qps, vsi->alloc_queue_pairs) { 69 rx_ring = vsi->rx_rings[q]; 70 if (i40e_realloc_rx_xdp_bi(rx_ring, zc)) 71 return -ENOMEM; 72 } 73 return 0; 74 } 75 76 /** 77 * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a 78 * certain ring/qid 79 * @vsi: Current VSI 80 * @pool: buffer pool 81 * @qid: Rx ring to associate buffer pool with 82 * 83 * Returns 0 on success, <0 on failure 84 **/ 85 static int i40e_xsk_pool_enable(struct i40e_vsi *vsi, 86 struct xsk_buff_pool *pool, 87 u16 qid) 88 { 89 struct net_device *netdev = vsi->netdev; 90 bool if_running; 91 int err; 92 93 if (vsi->type != I40E_VSI_MAIN) 94 return -EINVAL; 95 96 if (qid >= vsi->num_queue_pairs) 97 return -EINVAL; 98 99 if (qid >= netdev->real_num_rx_queues || 100 qid >= netdev->real_num_tx_queues) 101 return -EINVAL; 102 103 err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR); 104 if (err) 105 return err; 106 107 set_bit(qid, vsi->af_xdp_zc_qps); 108 109 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); 110 111 if (if_running) { 112 err = i40e_queue_pair_disable(vsi, qid); 113 if (err) 114 return err; 115 116 err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], true); 117 if (err) 118 return err; 119 120 err = i40e_queue_pair_enable(vsi, qid); 121 if (err) 122 return err; 123 124 /* Kick start the NAPI context so that receiving will start */ 125 err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX); 126 if (err) 127 return err; 128 } 129 130 return 0; 131 } 132 133 /** 134 * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a 135 * certain ring/qid 136 * @vsi: Current VSI 137 * @qid: Rx ring to associate buffer pool with 138 * 139 * Returns 0 on success, <0 on failure 140 **/ 141 static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid) 142 { 143 struct net_device *netdev = vsi->netdev; 144 struct xsk_buff_pool *pool; 145 bool if_running; 146 int err; 147 148 pool = xsk_get_pool_from_qid(netdev, qid); 149 if (!pool) 150 return -EINVAL; 151 152 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); 153 154 if (if_running) { 155 err = i40e_queue_pair_disable(vsi, qid); 156 if (err) 157 return err; 158 } 159 160 clear_bit(qid, vsi->af_xdp_zc_qps); 161 xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR); 162 163 if (if_running) { 164 err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], false); 165 if (err) 166 return err; 167 err = i40e_queue_pair_enable(vsi, qid); 168 if (err) 169 return err; 170 } 171 172 return 0; 173 } 174 175 /** 176 * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from 177 * a ring/qid 178 * @vsi: Current VSI 179 * @pool: Buffer pool to enable/associate to a ring, or NULL to disable 180 * @qid: Rx ring to (dis)associate buffer pool (from)to 181 * 182 * This function enables or disables a buffer pool to a certain ring. 183 * 184 * Returns 0 on success, <0 on failure 185 **/ 186 int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool, 187 u16 qid) 188 { 189 return pool ? i40e_xsk_pool_enable(vsi, pool, qid) : 190 i40e_xsk_pool_disable(vsi, qid); 191 } 192 193 /** 194 * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff 195 * @rx_ring: Rx ring 196 * @xdp: xdp_buff used as input to the XDP program 197 * @xdp_prog: XDP program to run 198 * 199 * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR} 200 **/ 201 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp, 202 struct bpf_prog *xdp_prog) 203 { 204 int err, result = I40E_XDP_PASS; 205 struct i40e_ring *xdp_ring; 206 u32 act; 207 208 act = bpf_prog_run_xdp(xdp_prog, xdp); 209 210 if (likely(act == XDP_REDIRECT)) { 211 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); 212 if (!err) 213 return I40E_XDP_REDIR; 214 if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS) 215 result = I40E_XDP_EXIT; 216 else 217 result = I40E_XDP_CONSUMED; 218 goto out_failure; 219 } 220 221 switch (act) { 222 case XDP_PASS: 223 break; 224 case XDP_TX: 225 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; 226 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring); 227 if (result == I40E_XDP_CONSUMED) 228 goto out_failure; 229 break; 230 case XDP_DROP: 231 result = I40E_XDP_CONSUMED; 232 break; 233 default: 234 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); 235 fallthrough; 236 case XDP_ABORTED: 237 result = I40E_XDP_CONSUMED; 238 out_failure: 239 trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 240 } 241 return result; 242 } 243 244 bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) 245 { 246 u16 ntu = rx_ring->next_to_use; 247 union i40e_rx_desc *rx_desc; 248 struct xdp_buff **xdp; 249 u32 nb_buffs, i; 250 dma_addr_t dma; 251 252 rx_desc = I40E_RX_DESC(rx_ring, ntu); 253 xdp = i40e_rx_bi(rx_ring, ntu); 254 255 nb_buffs = min_t(u16, count, rx_ring->count - ntu); 256 nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs); 257 if (!nb_buffs) 258 return false; 259 260 i = nb_buffs; 261 while (i--) { 262 dma = xsk_buff_xdp_get_dma(*xdp); 263 rx_desc->read.pkt_addr = cpu_to_le64(dma); 264 rx_desc->read.hdr_addr = 0; 265 266 rx_desc++; 267 xdp++; 268 } 269 270 ntu += nb_buffs; 271 if (ntu == rx_ring->count) { 272 rx_desc = I40E_RX_DESC(rx_ring, 0); 273 ntu = 0; 274 } 275 276 /* clear the status bits for the next_to_use descriptor */ 277 rx_desc->wb.qword1.status_error_len = 0; 278 i40e_release_rx_desc(rx_ring, ntu); 279 280 return count == nb_buffs; 281 } 282 283 /** 284 * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer 285 * @rx_ring: Rx ring 286 * @xdp: xdp_buff 287 * 288 * This functions allocates a new skb from a zero-copy Rx buffer. 289 * 290 * Returns the skb, or NULL on failure. 291 **/ 292 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, 293 struct xdp_buff *xdp) 294 { 295 unsigned int totalsize = xdp->data_end - xdp->data_meta; 296 unsigned int metasize = xdp->data - xdp->data_meta; 297 struct sk_buff *skb; 298 299 net_prefetch(xdp->data_meta); 300 301 /* allocate a skb to store the frags */ 302 skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, 303 GFP_ATOMIC | __GFP_NOWARN); 304 if (unlikely(!skb)) 305 goto out; 306 307 memcpy(__skb_put(skb, totalsize), xdp->data_meta, 308 ALIGN(totalsize, sizeof(long))); 309 310 if (metasize) { 311 skb_metadata_set(skb, metasize); 312 __skb_pull(skb, metasize); 313 } 314 315 out: 316 xsk_buff_free(xdp); 317 return skb; 318 } 319 320 static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, 321 struct xdp_buff *xdp_buff, 322 union i40e_rx_desc *rx_desc, 323 unsigned int *rx_packets, 324 unsigned int *rx_bytes, 325 unsigned int size, 326 unsigned int xdp_res, 327 bool *failure) 328 { 329 struct sk_buff *skb; 330 331 *rx_packets = 1; 332 *rx_bytes = size; 333 334 if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX) 335 return; 336 337 if (xdp_res == I40E_XDP_EXIT) { 338 *failure = true; 339 return; 340 } 341 342 if (xdp_res == I40E_XDP_CONSUMED) { 343 xsk_buff_free(xdp_buff); 344 return; 345 } 346 if (xdp_res == I40E_XDP_PASS) { 347 /* NB! We are not checking for errors using 348 * i40e_test_staterr with 349 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that 350 * SBP is *not* set in PRT_SBPVSI (default not set). 351 */ 352 skb = i40e_construct_skb_zc(rx_ring, xdp_buff); 353 if (!skb) { 354 rx_ring->rx_stats.alloc_buff_failed++; 355 *rx_packets = 0; 356 *rx_bytes = 0; 357 return; 358 } 359 360 if (eth_skb_pad(skb)) { 361 *rx_packets = 0; 362 *rx_bytes = 0; 363 return; 364 } 365 366 *rx_bytes = skb->len; 367 i40e_process_skb_fields(rx_ring, rx_desc, skb); 368 napi_gro_receive(&rx_ring->q_vector->napi, skb); 369 return; 370 } 371 372 /* Should never get here, as all valid cases have been handled already. 373 */ 374 WARN_ON_ONCE(1); 375 } 376 377 /** 378 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring 379 * @rx_ring: Rx ring 380 * @budget: NAPI budget 381 * 382 * Returns amount of work completed 383 **/ 384 int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) 385 { 386 unsigned int total_rx_bytes = 0, total_rx_packets = 0; 387 u16 next_to_clean = rx_ring->next_to_clean; 388 u16 count_mask = rx_ring->count - 1; 389 unsigned int xdp_res, xdp_xmit = 0; 390 struct bpf_prog *xdp_prog; 391 bool failure = false; 392 u16 cleaned_count; 393 394 /* NB! xdp_prog will always be !NULL, due to the fact that 395 * this path is enabled by setting an XDP program. 396 */ 397 xdp_prog = READ_ONCE(rx_ring->xdp_prog); 398 399 while (likely(total_rx_packets < (unsigned int)budget)) { 400 union i40e_rx_desc *rx_desc; 401 unsigned int rx_packets; 402 unsigned int rx_bytes; 403 struct xdp_buff *bi; 404 unsigned int size; 405 u64 qword; 406 407 rx_desc = I40E_RX_DESC(rx_ring, next_to_clean); 408 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); 409 410 /* This memory barrier is needed to keep us from reading 411 * any other fields out of the rx_desc until we have 412 * verified the descriptor has been written back. 413 */ 414 dma_rmb(); 415 416 if (i40e_rx_is_programming_status(qword)) { 417 i40e_clean_programming_status(rx_ring, 418 rx_desc->raw.qword[0], 419 qword); 420 bi = *i40e_rx_bi(rx_ring, next_to_clean); 421 xsk_buff_free(bi); 422 next_to_clean = (next_to_clean + 1) & count_mask; 423 continue; 424 } 425 426 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> 427 I40E_RXD_QW1_LENGTH_PBUF_SHIFT; 428 if (!size) 429 break; 430 431 bi = *i40e_rx_bi(rx_ring, next_to_clean); 432 xsk_buff_set_size(bi, size); 433 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool); 434 435 xdp_res = i40e_run_xdp_zc(rx_ring, bi, xdp_prog); 436 i40e_handle_xdp_result_zc(rx_ring, bi, rx_desc, &rx_packets, 437 &rx_bytes, size, xdp_res, &failure); 438 if (failure) 439 break; 440 total_rx_packets += rx_packets; 441 total_rx_bytes += rx_bytes; 442 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR); 443 next_to_clean = (next_to_clean + 1) & count_mask; 444 } 445 446 rx_ring->next_to_clean = next_to_clean; 447 cleaned_count = (next_to_clean - rx_ring->next_to_use - 1) & count_mask; 448 449 if (cleaned_count >= I40E_RX_BUFFER_WRITE) 450 failure |= !i40e_alloc_rx_buffers_zc(rx_ring, cleaned_count); 451 452 i40e_finalize_xdp_rx(rx_ring, xdp_xmit); 453 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); 454 455 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { 456 if (failure || next_to_clean == rx_ring->next_to_use) 457 xsk_set_rx_need_wakeup(rx_ring->xsk_pool); 458 else 459 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); 460 461 return (int)total_rx_packets; 462 } 463 return failure ? budget : (int)total_rx_packets; 464 } 465 466 static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 467 unsigned int *total_bytes) 468 { 469 struct i40e_tx_desc *tx_desc; 470 dma_addr_t dma; 471 472 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr); 473 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len); 474 475 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++); 476 tx_desc->buffer_addr = cpu_to_le64(dma); 477 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | I40E_TX_DESC_CMD_EOP, 478 0, desc->len, 0); 479 480 *total_bytes += desc->len; 481 } 482 483 static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 484 unsigned int *total_bytes) 485 { 486 u16 ntu = xdp_ring->next_to_use; 487 struct i40e_tx_desc *tx_desc; 488 dma_addr_t dma; 489 u32 i; 490 491 loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { 492 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr); 493 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len); 494 495 tx_desc = I40E_TX_DESC(xdp_ring, ntu++); 496 tx_desc->buffer_addr = cpu_to_le64(dma); 497 tx_desc->cmd_type_offset_bsz = build_ctob(I40E_TX_DESC_CMD_ICRC | 498 I40E_TX_DESC_CMD_EOP, 499 0, desc[i].len, 0); 500 501 *total_bytes += desc[i].len; 502 } 503 504 xdp_ring->next_to_use = ntu; 505 } 506 507 static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, 508 unsigned int *total_bytes) 509 { 510 u32 batched, leftover, i; 511 512 batched = nb_pkts & ~(PKTS_PER_BATCH - 1); 513 leftover = nb_pkts & (PKTS_PER_BATCH - 1); 514 for (i = 0; i < batched; i += PKTS_PER_BATCH) 515 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); 516 for (i = batched; i < batched + leftover; i++) 517 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes); 518 } 519 520 static void i40e_set_rs_bit(struct i40e_ring *xdp_ring) 521 { 522 u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; 523 struct i40e_tx_desc *tx_desc; 524 525 tx_desc = I40E_TX_DESC(xdp_ring, ntu); 526 tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT); 527 } 528 529 /** 530 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP 531 * @xdp_ring: XDP Tx ring 532 * @budget: NAPI budget 533 * 534 * Returns true if the work is finished. 535 **/ 536 static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) 537 { 538 struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; 539 u32 nb_pkts, nb_processed = 0; 540 unsigned int total_bytes = 0; 541 542 nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget); 543 if (!nb_pkts) 544 return true; 545 546 if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) { 547 nb_processed = xdp_ring->count - xdp_ring->next_to_use; 548 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); 549 xdp_ring->next_to_use = 0; 550 } 551 552 i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, 553 &total_bytes); 554 555 /* Request an interrupt for the last frame and bump tail ptr. */ 556 i40e_set_rs_bit(xdp_ring); 557 i40e_xdp_ring_update_tail(xdp_ring); 558 559 i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes); 560 561 return nb_pkts < budget; 562 } 563 564 /** 565 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry 566 * @tx_ring: XDP Tx ring 567 * @tx_bi: Tx buffer info to clean 568 **/ 569 static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring, 570 struct i40e_tx_buffer *tx_bi) 571 { 572 xdp_return_frame(tx_bi->xdpf); 573 tx_ring->xdp_tx_active--; 574 dma_unmap_single(tx_ring->dev, 575 dma_unmap_addr(tx_bi, dma), 576 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); 577 dma_unmap_len_set(tx_bi, len, 0); 578 } 579 580 /** 581 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries 582 * @vsi: Current VSI 583 * @tx_ring: XDP Tx ring 584 * 585 * Returns true if cleanup/tranmission is done. 586 **/ 587 bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring) 588 { 589 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 590 u32 i, completed_frames, xsk_frames = 0; 591 u32 head_idx = i40e_get_head(tx_ring); 592 struct i40e_tx_buffer *tx_bi; 593 unsigned int ntc; 594 595 if (head_idx < tx_ring->next_to_clean) 596 head_idx += tx_ring->count; 597 completed_frames = head_idx - tx_ring->next_to_clean; 598 599 if (completed_frames == 0) 600 goto out_xmit; 601 602 if (likely(!tx_ring->xdp_tx_active)) { 603 xsk_frames = completed_frames; 604 goto skip; 605 } 606 607 ntc = tx_ring->next_to_clean; 608 609 for (i = 0; i < completed_frames; i++) { 610 tx_bi = &tx_ring->tx_bi[ntc]; 611 612 if (tx_bi->xdpf) { 613 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 614 tx_bi->xdpf = NULL; 615 } else { 616 xsk_frames++; 617 } 618 619 if (++ntc >= tx_ring->count) 620 ntc = 0; 621 } 622 623 skip: 624 tx_ring->next_to_clean += completed_frames; 625 if (unlikely(tx_ring->next_to_clean >= tx_ring->count)) 626 tx_ring->next_to_clean -= tx_ring->count; 627 628 if (xsk_frames) 629 xsk_tx_completed(bp, xsk_frames); 630 631 i40e_arm_wb(tx_ring, vsi, completed_frames); 632 633 out_xmit: 634 if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) 635 xsk_set_tx_need_wakeup(tx_ring->xsk_pool); 636 637 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring)); 638 } 639 640 /** 641 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup 642 * @dev: the netdevice 643 * @queue_id: queue id to wake up 644 * @flags: ignored in our case since we have Rx and Tx in the same NAPI. 645 * 646 * Returns <0 for errors, 0 otherwise. 647 **/ 648 int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) 649 { 650 struct i40e_netdev_priv *np = netdev_priv(dev); 651 struct i40e_vsi *vsi = np->vsi; 652 struct i40e_pf *pf = vsi->back; 653 struct i40e_ring *ring; 654 655 if (test_bit(__I40E_CONFIG_BUSY, pf->state)) 656 return -EAGAIN; 657 658 if (test_bit(__I40E_VSI_DOWN, vsi->state)) 659 return -ENETDOWN; 660 661 if (!i40e_enabled_xdp_vsi(vsi)) 662 return -EINVAL; 663 664 if (queue_id >= vsi->num_queue_pairs) 665 return -EINVAL; 666 667 if (!vsi->xdp_rings[queue_id]->xsk_pool) 668 return -EINVAL; 669 670 ring = vsi->xdp_rings[queue_id]; 671 672 /* The idea here is that if NAPI is running, mark a miss, so 673 * it will run again. If not, trigger an interrupt and 674 * schedule the NAPI from interrupt context. If NAPI would be 675 * scheduled here, the interrupt affinity would not be 676 * honored. 677 */ 678 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) 679 i40e_force_wb(vsi, ring->q_vector); 680 681 return 0; 682 } 683 684 void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring) 685 { 686 u16 count_mask = rx_ring->count - 1; 687 u16 ntc = rx_ring->next_to_clean; 688 u16 ntu = rx_ring->next_to_use; 689 690 for ( ; ntc != ntu; ntc = (ntc + 1) & count_mask) { 691 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc); 692 693 xsk_buff_free(rx_bi); 694 } 695 } 696 697 /** 698 * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown 699 * @tx_ring: XDP Tx ring 700 **/ 701 void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring) 702 { 703 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; 704 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 705 struct i40e_tx_buffer *tx_bi; 706 u32 xsk_frames = 0; 707 708 while (ntc != ntu) { 709 tx_bi = &tx_ring->tx_bi[ntc]; 710 711 if (tx_bi->xdpf) 712 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 713 else 714 xsk_frames++; 715 716 tx_bi->xdpf = NULL; 717 718 ntc++; 719 if (ntc >= tx_ring->count) 720 ntc = 0; 721 } 722 723 if (xsk_frames) 724 xsk_tx_completed(bp, xsk_frames); 725 } 726 727 /** 728 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP 729 * buffer pool attached 730 * @vsi: vsi 731 * 732 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached 733 **/ 734 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi) 735 { 736 struct net_device *netdev = vsi->netdev; 737 int i; 738 739 for (i = 0; i < vsi->num_queue_pairs; i++) { 740 if (xsk_get_pool_from_qid(netdev, i)) 741 return true; 742 } 743 744 return false; 745 } 746