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 13void 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 19static 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 */ 33static 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 */ 63int 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 **/ 85static 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 **/ 141static 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 **/ 186int 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 **/ 201static 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; 238out_failure: 239 trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 240 } 241 return result; 242} 243 244bool 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 **/ 292static 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 skb_shared_info *sinfo = NULL; 298 struct sk_buff *skb; 299 u32 nr_frags = 0; 300 301 if (unlikely(xdp_buff_has_frags(xdp))) { 302 sinfo = xdp_get_shared_info_from_buff(xdp); 303 nr_frags = sinfo->nr_frags; 304 } 305 net_prefetch(xdp->data_meta); 306 307 /* allocate a skb to store the frags */ 308 skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, 309 GFP_ATOMIC | __GFP_NOWARN); 310 if (unlikely(!skb)) 311 goto out; 312 313 memcpy(__skb_put(skb, totalsize), xdp->data_meta, 314 ALIGN(totalsize, sizeof(long))); 315 316 if (metasize) { 317 skb_metadata_set(skb, metasize); 318 __skb_pull(skb, metasize); 319 } 320 321 if (likely(!xdp_buff_has_frags(xdp))) 322 goto out; 323 324 for (int i = 0; i < nr_frags; i++) { 325 struct skb_shared_info *skinfo = skb_shinfo(skb); 326 skb_frag_t *frag = &sinfo->frags[i]; 327 struct page *page; 328 void *addr; 329 330 page = dev_alloc_page(); 331 if (!page) { 332 dev_kfree_skb(skb); 333 return NULL; 334 } 335 addr = page_to_virt(page); 336 337 memcpy(addr, skb_frag_page(frag), skb_frag_size(frag)); 338 339 __skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++, 340 addr, 0, skb_frag_size(frag)); 341 } 342 343out: 344 xsk_buff_free(xdp); 345 return skb; 346} 347 348static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, 349 struct xdp_buff *xdp_buff, 350 union i40e_rx_desc *rx_desc, 351 unsigned int *rx_packets, 352 unsigned int *rx_bytes, 353 unsigned int xdp_res, 354 bool *failure) 355{ 356 struct sk_buff *skb; 357 358 *rx_packets = 1; 359 *rx_bytes = xdp_get_buff_len(xdp_buff); 360 361 if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX) 362 return; 363 364 if (xdp_res == I40E_XDP_EXIT) { 365 *failure = true; 366 return; 367 } 368 369 if (xdp_res == I40E_XDP_CONSUMED) { 370 xsk_buff_free(xdp_buff); 371 return; 372 } 373 if (xdp_res == I40E_XDP_PASS) { 374 /* NB! We are not checking for errors using 375 * i40e_test_staterr with 376 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that 377 * SBP is *not* set in PRT_SBPVSI (default not set). 378 */ 379 skb = i40e_construct_skb_zc(rx_ring, xdp_buff); 380 if (!skb) { 381 rx_ring->rx_stats.alloc_buff_failed++; 382 *rx_packets = 0; 383 *rx_bytes = 0; 384 return; 385 } 386 387 if (eth_skb_pad(skb)) { 388 *rx_packets = 0; 389 *rx_bytes = 0; 390 return; 391 } 392 393 i40e_process_skb_fields(rx_ring, rx_desc, skb); 394 napi_gro_receive(&rx_ring->q_vector->napi, skb); 395 return; 396 } 397 398 /* Should never get here, as all valid cases have been handled already. 399 */ 400 WARN_ON_ONCE(1); 401} 402 403static int 404i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first, 405 struct xdp_buff *xdp, const unsigned int size) 406{ 407 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first); 408 409 if (!xdp_buff_has_frags(first)) { 410 sinfo->nr_frags = 0; 411 sinfo->xdp_frags_size = 0; 412 xdp_buff_set_frags_flag(first); 413 } 414 415 if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) { 416 xsk_buff_free(first); 417 return -ENOMEM; 418 } 419 420 __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++, 421 virt_to_page(xdp->data_hard_start), 422 XDP_PACKET_HEADROOM, size); 423 sinfo->xdp_frags_size += size; 424 xsk_buff_add_frag(xdp); 425 426 return 0; 427} 428 429/** 430 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring 431 * @rx_ring: Rx ring 432 * @budget: NAPI budget 433 * 434 * Returns amount of work completed 435 **/ 436int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) 437{ 438 unsigned int total_rx_bytes = 0, total_rx_packets = 0; 439 u16 next_to_process = rx_ring->next_to_process; 440 u16 next_to_clean = rx_ring->next_to_clean; 441 unsigned int xdp_res, xdp_xmit = 0; 442 struct xdp_buff *first = NULL; 443 u32 count = rx_ring->count; 444 struct bpf_prog *xdp_prog; 445 u32 entries_to_alloc; 446 bool failure = false; 447 448 if (next_to_process != next_to_clean) 449 first = *i40e_rx_bi(rx_ring, next_to_clean); 450 451 /* NB! xdp_prog will always be !NULL, due to the fact that 452 * this path is enabled by setting an XDP program. 453 */ 454 xdp_prog = READ_ONCE(rx_ring->xdp_prog); 455 456 while (likely(total_rx_packets < (unsigned int)budget)) { 457 union i40e_rx_desc *rx_desc; 458 unsigned int rx_packets; 459 unsigned int rx_bytes; 460 struct xdp_buff *bi; 461 unsigned int size; 462 u64 qword; 463 464 rx_desc = I40E_RX_DESC(rx_ring, next_to_process); 465 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); 466 467 /* This memory barrier is needed to keep us from reading 468 * any other fields out of the rx_desc until we have 469 * verified the descriptor has been written back. 470 */ 471 dma_rmb(); 472 473 if (i40e_rx_is_programming_status(qword)) { 474 i40e_clean_programming_status(rx_ring, 475 rx_desc->raw.qword[0], 476 qword); 477 bi = *i40e_rx_bi(rx_ring, next_to_process); 478 xsk_buff_free(bi); 479 if (++next_to_process == count) 480 next_to_process = 0; 481 continue; 482 } 483 484 size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> 485 I40E_RXD_QW1_LENGTH_PBUF_SHIFT; 486 if (!size) 487 break; 488 489 bi = *i40e_rx_bi(rx_ring, next_to_process); 490 xsk_buff_set_size(bi, size); 491 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool); 492 493 if (!first) 494 first = bi; 495 else if (i40e_add_xsk_frag(rx_ring, first, bi, size)) 496 break; 497 498 if (++next_to_process == count) 499 next_to_process = 0; 500 501 if (i40e_is_non_eop(rx_ring, rx_desc)) 502 continue; 503 504 xdp_res = i40e_run_xdp_zc(rx_ring, first, xdp_prog); 505 i40e_handle_xdp_result_zc(rx_ring, first, rx_desc, &rx_packets, 506 &rx_bytes, xdp_res, &failure); 507 next_to_clean = next_to_process; 508 if (failure) 509 break; 510 total_rx_packets += rx_packets; 511 total_rx_bytes += rx_bytes; 512 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR); 513 first = NULL; 514 } 515 516 rx_ring->next_to_clean = next_to_clean; 517 rx_ring->next_to_process = next_to_process; 518 519 entries_to_alloc = I40E_DESC_UNUSED(rx_ring); 520 if (entries_to_alloc >= I40E_RX_BUFFER_WRITE) 521 failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc); 522 523 i40e_finalize_xdp_rx(rx_ring, xdp_xmit); 524 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); 525 526 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { 527 if (failure || next_to_clean == rx_ring->next_to_use) 528 xsk_set_rx_need_wakeup(rx_ring->xsk_pool); 529 else 530 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); 531 532 return (int)total_rx_packets; 533 } 534 return failure ? budget : (int)total_rx_packets; 535} 536 537static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 538 unsigned int *total_bytes) 539{ 540 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(desc); 541 struct i40e_tx_desc *tx_desc; 542 dma_addr_t dma; 543 544 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr); 545 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len); 546 547 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++); 548 tx_desc->buffer_addr = cpu_to_le64(dma); 549 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc->len, 0); 550 551 *total_bytes += desc->len; 552} 553 554static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 555 unsigned int *total_bytes) 556{ 557 u16 ntu = xdp_ring->next_to_use; 558 struct i40e_tx_desc *tx_desc; 559 dma_addr_t dma; 560 u32 i; 561 562 loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { 563 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(&desc[i]); 564 565 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr); 566 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len); 567 568 tx_desc = I40E_TX_DESC(xdp_ring, ntu++); 569 tx_desc->buffer_addr = cpu_to_le64(dma); 570 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc[i].len, 0); 571 572 *total_bytes += desc[i].len; 573 } 574 575 xdp_ring->next_to_use = ntu; 576} 577 578static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, 579 unsigned int *total_bytes) 580{ 581 u32 batched, leftover, i; 582 583 batched = nb_pkts & ~(PKTS_PER_BATCH - 1); 584 leftover = nb_pkts & (PKTS_PER_BATCH - 1); 585 for (i = 0; i < batched; i += PKTS_PER_BATCH) 586 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); 587 for (i = batched; i < batched + leftover; i++) 588 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes); 589} 590 591static void i40e_set_rs_bit(struct i40e_ring *xdp_ring) 592{ 593 u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; 594 struct i40e_tx_desc *tx_desc; 595 596 tx_desc = I40E_TX_DESC(xdp_ring, ntu); 597 tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT); 598} 599 600/** 601 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP 602 * @xdp_ring: XDP Tx ring 603 * @budget: NAPI budget 604 * 605 * Returns true if the work is finished. 606 **/ 607static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) 608{ 609 struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; 610 u32 nb_pkts, nb_processed = 0; 611 unsigned int total_bytes = 0; 612 613 nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget); 614 if (!nb_pkts) 615 return true; 616 617 if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) { 618 nb_processed = xdp_ring->count - xdp_ring->next_to_use; 619 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); 620 xdp_ring->next_to_use = 0; 621 } 622 623 i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, 624 &total_bytes); 625 626 /* Request an interrupt for the last frame and bump tail ptr. */ 627 i40e_set_rs_bit(xdp_ring); 628 i40e_xdp_ring_update_tail(xdp_ring); 629 630 i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes); 631 632 return nb_pkts < budget; 633} 634 635/** 636 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry 637 * @tx_ring: XDP Tx ring 638 * @tx_bi: Tx buffer info to clean 639 **/ 640static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring, 641 struct i40e_tx_buffer *tx_bi) 642{ 643 xdp_return_frame(tx_bi->xdpf); 644 tx_ring->xdp_tx_active--; 645 dma_unmap_single(tx_ring->dev, 646 dma_unmap_addr(tx_bi, dma), 647 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); 648 dma_unmap_len_set(tx_bi, len, 0); 649} 650 651/** 652 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries 653 * @vsi: Current VSI 654 * @tx_ring: XDP Tx ring 655 * 656 * Returns true if cleanup/transmission is done. 657 **/ 658bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring) 659{ 660 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 661 u32 i, completed_frames, xsk_frames = 0; 662 u32 head_idx = i40e_get_head(tx_ring); 663 struct i40e_tx_buffer *tx_bi; 664 unsigned int ntc; 665 666 if (head_idx < tx_ring->next_to_clean) 667 head_idx += tx_ring->count; 668 completed_frames = head_idx - tx_ring->next_to_clean; 669 670 if (completed_frames == 0) 671 goto out_xmit; 672 673 if (likely(!tx_ring->xdp_tx_active)) { 674 xsk_frames = completed_frames; 675 goto skip; 676 } 677 678 ntc = tx_ring->next_to_clean; 679 680 for (i = 0; i < completed_frames; i++) { 681 tx_bi = &tx_ring->tx_bi[ntc]; 682 683 if (tx_bi->xdpf) { 684 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 685 tx_bi->xdpf = NULL; 686 } else { 687 xsk_frames++; 688 } 689 690 if (++ntc >= tx_ring->count) 691 ntc = 0; 692 } 693 694skip: 695 tx_ring->next_to_clean += completed_frames; 696 if (unlikely(tx_ring->next_to_clean >= tx_ring->count)) 697 tx_ring->next_to_clean -= tx_ring->count; 698 699 if (xsk_frames) 700 xsk_tx_completed(bp, xsk_frames); 701 702 i40e_arm_wb(tx_ring, vsi, completed_frames); 703 704out_xmit: 705 if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) 706 xsk_set_tx_need_wakeup(tx_ring->xsk_pool); 707 708 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring)); 709} 710 711/** 712 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup 713 * @dev: the netdevice 714 * @queue_id: queue id to wake up 715 * @flags: ignored in our case since we have Rx and Tx in the same NAPI. 716 * 717 * Returns <0 for errors, 0 otherwise. 718 **/ 719int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) 720{ 721 struct i40e_netdev_priv *np = netdev_priv(dev); 722 struct i40e_vsi *vsi = np->vsi; 723 struct i40e_pf *pf = vsi->back; 724 struct i40e_ring *ring; 725 726 if (test_bit(__I40E_CONFIG_BUSY, pf->state)) 727 return -EAGAIN; 728 729 if (test_bit(__I40E_VSI_DOWN, vsi->state)) 730 return -ENETDOWN; 731 732 if (!i40e_enabled_xdp_vsi(vsi)) 733 return -EINVAL; 734 735 if (queue_id >= vsi->num_queue_pairs) 736 return -EINVAL; 737 738 if (!vsi->xdp_rings[queue_id]->xsk_pool) 739 return -EINVAL; 740 741 ring = vsi->xdp_rings[queue_id]; 742 743 /* The idea here is that if NAPI is running, mark a miss, so 744 * it will run again. If not, trigger an interrupt and 745 * schedule the NAPI from interrupt context. If NAPI would be 746 * scheduled here, the interrupt affinity would not be 747 * honored. 748 */ 749 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) 750 i40e_force_wb(vsi, ring->q_vector); 751 752 return 0; 753} 754 755void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring) 756{ 757 u16 ntc = rx_ring->next_to_clean; 758 u16 ntu = rx_ring->next_to_use; 759 760 while (ntc != ntu) { 761 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc); 762 763 xsk_buff_free(rx_bi); 764 ntc++; 765 if (ntc >= rx_ring->count) 766 ntc = 0; 767 } 768} 769 770/** 771 * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown 772 * @tx_ring: XDP Tx ring 773 **/ 774void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring) 775{ 776 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; 777 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 778 struct i40e_tx_buffer *tx_bi; 779 u32 xsk_frames = 0; 780 781 while (ntc != ntu) { 782 tx_bi = &tx_ring->tx_bi[ntc]; 783 784 if (tx_bi->xdpf) 785 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 786 else 787 xsk_frames++; 788 789 tx_bi->xdpf = NULL; 790 791 ntc++; 792 if (ntc >= tx_ring->count) 793 ntc = 0; 794 } 795 796 if (xsk_frames) 797 xsk_tx_completed(bp, xsk_frames); 798} 799 800/** 801 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP 802 * buffer pool attached 803 * @vsi: vsi 804 * 805 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached 806 **/ 807bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi) 808{ 809 struct net_device *netdev = vsi->netdev; 810 int i; 811 812 for (i = 0; i < vsi->num_queue_pairs; i++) { 813 if (xsk_get_pool_from_qid(netdev, i)) 814 return true; 815 } 816 817 return false; 818} 819