1// SPDX-License-Identifier: GPL-2.0 2/* Copyright(c) 2018 Intel Corporation. */ 3 4#include <linux/bpf_trace.h> 5#include <net/xdp_sock_drv.h> 6#include "i40e_txrx_common.h" 7#include "i40e_xsk.h" 8 9void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring) 10{ 11 memset(rx_ring->rx_bi_zc, 0, 12 sizeof(*rx_ring->rx_bi_zc) * rx_ring->count); 13} 14 15static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx) 16{ 17 return &rx_ring->rx_bi_zc[idx]; 18} 19 20/** 21 * i40e_realloc_rx_xdp_bi - reallocate SW ring for either XSK or normal buffer 22 * @rx_ring: Current rx ring 23 * @pool_present: is pool for XSK present 24 * 25 * Try allocating memory and return ENOMEM, if failed to allocate. 26 * If allocation was successful, substitute buffer with allocated one. 27 * Returns 0 on success, negative on failure 28 */ 29static int i40e_realloc_rx_xdp_bi(struct i40e_ring *rx_ring, bool pool_present) 30{ 31 size_t elem_size = pool_present ? sizeof(*rx_ring->rx_bi_zc) : 32 sizeof(*rx_ring->rx_bi); 33 void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL); 34 35 if (!sw_ring) 36 return -ENOMEM; 37 38 if (pool_present) { 39 kfree(rx_ring->rx_bi); 40 rx_ring->rx_bi = NULL; 41 rx_ring->rx_bi_zc = sw_ring; 42 } else { 43 kfree(rx_ring->rx_bi_zc); 44 rx_ring->rx_bi_zc = NULL; 45 rx_ring->rx_bi = sw_ring; 46 } 47 return 0; 48} 49 50/** 51 * i40e_realloc_rx_bi_zc - reallocate rx SW rings 52 * @vsi: Current VSI 53 * @zc: is zero copy set 54 * 55 * Reallocate buffer for rx_rings that might be used by XSK. 56 * XDP requires more memory, than rx_buf provides. 57 * Returns 0 on success, negative on failure 58 */ 59int i40e_realloc_rx_bi_zc(struct i40e_vsi *vsi, bool zc) 60{ 61 struct i40e_ring *rx_ring; 62 unsigned long q; 63 64 for_each_set_bit(q, vsi->af_xdp_zc_qps, vsi->alloc_queue_pairs) { 65 rx_ring = vsi->rx_rings[q]; 66 if (i40e_realloc_rx_xdp_bi(rx_ring, zc)) 67 return -ENOMEM; 68 } 69 return 0; 70} 71 72/** 73 * i40e_xsk_pool_enable - Enable/associate an AF_XDP buffer pool to a 74 * certain ring/qid 75 * @vsi: Current VSI 76 * @pool: buffer pool 77 * @qid: Rx ring to associate buffer pool with 78 * 79 * Returns 0 on success, <0 on failure 80 **/ 81static int i40e_xsk_pool_enable(struct i40e_vsi *vsi, 82 struct xsk_buff_pool *pool, 83 u16 qid) 84{ 85 struct net_device *netdev = vsi->netdev; 86 bool if_running; 87 int err; 88 89 if (vsi->type != I40E_VSI_MAIN) 90 return -EINVAL; 91 92 if (qid >= vsi->num_queue_pairs) 93 return -EINVAL; 94 95 if (qid >= netdev->real_num_rx_queues || 96 qid >= netdev->real_num_tx_queues) 97 return -EINVAL; 98 99 err = xsk_pool_dma_map(pool, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR); 100 if (err) 101 return err; 102 103 set_bit(qid, vsi->af_xdp_zc_qps); 104 105 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); 106 107 if (if_running) { 108 err = i40e_queue_pair_disable(vsi, qid); 109 if (err) 110 return err; 111 112 err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], true); 113 if (err) 114 return err; 115 116 err = i40e_queue_pair_enable(vsi, qid); 117 if (err) 118 return err; 119 120 /* Kick start the NAPI context so that receiving will start */ 121 err = i40e_xsk_wakeup(vsi->netdev, qid, XDP_WAKEUP_RX); 122 if (err) 123 return err; 124 } 125 126 return 0; 127} 128 129/** 130 * i40e_xsk_pool_disable - Disassociate an AF_XDP buffer pool from a 131 * certain ring/qid 132 * @vsi: Current VSI 133 * @qid: Rx ring to associate buffer pool with 134 * 135 * Returns 0 on success, <0 on failure 136 **/ 137static int i40e_xsk_pool_disable(struct i40e_vsi *vsi, u16 qid) 138{ 139 struct net_device *netdev = vsi->netdev; 140 struct xsk_buff_pool *pool; 141 bool if_running; 142 int err; 143 144 pool = xsk_get_pool_from_qid(netdev, qid); 145 if (!pool) 146 return -EINVAL; 147 148 if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi); 149 150 if (if_running) { 151 err = i40e_queue_pair_disable(vsi, qid); 152 if (err) 153 return err; 154 } 155 156 clear_bit(qid, vsi->af_xdp_zc_qps); 157 xsk_pool_dma_unmap(pool, I40E_RX_DMA_ATTR); 158 159 if (if_running) { 160 err = i40e_realloc_rx_xdp_bi(vsi->rx_rings[qid], false); 161 if (err) 162 return err; 163 err = i40e_queue_pair_enable(vsi, qid); 164 if (err) 165 return err; 166 } 167 168 return 0; 169} 170 171/** 172 * i40e_xsk_pool_setup - Enable/disassociate an AF_XDP buffer pool to/from 173 * a ring/qid 174 * @vsi: Current VSI 175 * @pool: Buffer pool to enable/associate to a ring, or NULL to disable 176 * @qid: Rx ring to (dis)associate buffer pool (from)to 177 * 178 * This function enables or disables a buffer pool to a certain ring. 179 * 180 * Returns 0 on success, <0 on failure 181 **/ 182int i40e_xsk_pool_setup(struct i40e_vsi *vsi, struct xsk_buff_pool *pool, 183 u16 qid) 184{ 185 return pool ? i40e_xsk_pool_enable(vsi, pool, qid) : 186 i40e_xsk_pool_disable(vsi, qid); 187} 188 189/** 190 * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff 191 * @rx_ring: Rx ring 192 * @xdp: xdp_buff used as input to the XDP program 193 * @xdp_prog: XDP program to run 194 * 195 * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR} 196 **/ 197static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp, 198 struct bpf_prog *xdp_prog) 199{ 200 int err, result = I40E_XDP_PASS; 201 struct i40e_ring *xdp_ring; 202 u32 act; 203 204 act = bpf_prog_run_xdp(xdp_prog, xdp); 205 206 if (likely(act == XDP_REDIRECT)) { 207 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog); 208 if (!err) 209 return I40E_XDP_REDIR; 210 if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS) 211 result = I40E_XDP_EXIT; 212 else 213 result = I40E_XDP_CONSUMED; 214 goto out_failure; 215 } 216 217 switch (act) { 218 case XDP_PASS: 219 break; 220 case XDP_TX: 221 xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->queue_index]; 222 result = i40e_xmit_xdp_tx_ring(xdp, xdp_ring); 223 if (result == I40E_XDP_CONSUMED) 224 goto out_failure; 225 break; 226 case XDP_DROP: 227 result = I40E_XDP_CONSUMED; 228 break; 229 default: 230 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act); 231 fallthrough; 232 case XDP_ABORTED: 233 result = I40E_XDP_CONSUMED; 234out_failure: 235 trace_xdp_exception(rx_ring->netdev, xdp_prog, act); 236 } 237 return result; 238} 239 240bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) 241{ 242 u16 ntu = rx_ring->next_to_use; 243 union i40e_rx_desc *rx_desc; 244 struct xdp_buff **xdp; 245 u32 nb_buffs, i; 246 dma_addr_t dma; 247 248 rx_desc = I40E_RX_DESC(rx_ring, ntu); 249 xdp = i40e_rx_bi(rx_ring, ntu); 250 251 nb_buffs = min_t(u16, count, rx_ring->count - ntu); 252 nb_buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, nb_buffs); 253 if (!nb_buffs) 254 return false; 255 256 i = nb_buffs; 257 while (i--) { 258 dma = xsk_buff_xdp_get_dma(*xdp); 259 rx_desc->read.pkt_addr = cpu_to_le64(dma); 260 rx_desc->read.hdr_addr = 0; 261 262 rx_desc++; 263 xdp++; 264 } 265 266 ntu += nb_buffs; 267 if (ntu == rx_ring->count) { 268 rx_desc = I40E_RX_DESC(rx_ring, 0); 269 ntu = 0; 270 } 271 272 /* clear the status bits for the next_to_use descriptor */ 273 rx_desc->wb.qword1.status_error_len = 0; 274 i40e_release_rx_desc(rx_ring, ntu); 275 276 return count == nb_buffs; 277} 278 279/** 280 * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer 281 * @rx_ring: Rx ring 282 * @xdp: xdp_buff 283 * 284 * This functions allocates a new skb from a zero-copy Rx buffer. 285 * 286 * Returns the skb, or NULL on failure. 287 **/ 288static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, 289 struct xdp_buff *xdp) 290{ 291 unsigned int totalsize = xdp->data_end - xdp->data_meta; 292 unsigned int metasize = xdp->data - xdp->data_meta; 293 struct skb_shared_info *sinfo = NULL; 294 struct sk_buff *skb; 295 u32 nr_frags = 0; 296 297 if (unlikely(xdp_buff_has_frags(xdp))) { 298 sinfo = xdp_get_shared_info_from_buff(xdp); 299 nr_frags = sinfo->nr_frags; 300 } 301 net_prefetch(xdp->data_meta); 302 303 /* allocate a skb to store the frags */ 304 skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize, 305 GFP_ATOMIC | __GFP_NOWARN); 306 if (unlikely(!skb)) 307 goto out; 308 309 memcpy(__skb_put(skb, totalsize), xdp->data_meta, 310 ALIGN(totalsize, sizeof(long))); 311 312 if (metasize) { 313 skb_metadata_set(skb, metasize); 314 __skb_pull(skb, metasize); 315 } 316 317 if (likely(!xdp_buff_has_frags(xdp))) 318 goto out; 319 320 for (int i = 0; i < nr_frags; i++) { 321 struct skb_shared_info *skinfo = skb_shinfo(skb); 322 skb_frag_t *frag = &sinfo->frags[i]; 323 struct page *page; 324 void *addr; 325 326 page = dev_alloc_page(); 327 if (!page) { 328 dev_kfree_skb(skb); 329 return NULL; 330 } 331 addr = page_to_virt(page); 332 333 memcpy(addr, skb_frag_page(frag), skb_frag_size(frag)); 334 335 __skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++, 336 addr, 0, skb_frag_size(frag)); 337 } 338 339out: 340 xsk_buff_free(xdp); 341 return skb; 342} 343 344static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, 345 struct xdp_buff *xdp_buff, 346 union i40e_rx_desc *rx_desc, 347 unsigned int *rx_packets, 348 unsigned int *rx_bytes, 349 unsigned int xdp_res, 350 bool *failure) 351{ 352 struct sk_buff *skb; 353 354 *rx_packets = 1; 355 *rx_bytes = xdp_get_buff_len(xdp_buff); 356 357 if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX) 358 return; 359 360 if (xdp_res == I40E_XDP_EXIT) { 361 *failure = true; 362 return; 363 } 364 365 if (xdp_res == I40E_XDP_CONSUMED) { 366 xsk_buff_free(xdp_buff); 367 return; 368 } 369 if (xdp_res == I40E_XDP_PASS) { 370 /* NB! We are not checking for errors using 371 * i40e_test_staterr with 372 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that 373 * SBP is *not* set in PRT_SBPVSI (default not set). 374 */ 375 skb = i40e_construct_skb_zc(rx_ring, xdp_buff); 376 if (!skb) { 377 rx_ring->rx_stats.alloc_buff_failed++; 378 *rx_packets = 0; 379 *rx_bytes = 0; 380 return; 381 } 382 383 if (eth_skb_pad(skb)) { 384 *rx_packets = 0; 385 *rx_bytes = 0; 386 return; 387 } 388 389 i40e_process_skb_fields(rx_ring, rx_desc, skb); 390 napi_gro_receive(&rx_ring->q_vector->napi, skb); 391 return; 392 } 393 394 /* Should never get here, as all valid cases have been handled already. 395 */ 396 WARN_ON_ONCE(1); 397} 398 399static int 400i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first, 401 struct xdp_buff *xdp, const unsigned int size) 402{ 403 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first); 404 405 if (!xdp_buff_has_frags(first)) { 406 sinfo->nr_frags = 0; 407 sinfo->xdp_frags_size = 0; 408 xdp_buff_set_frags_flag(first); 409 } 410 411 if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) { 412 xsk_buff_free(first); 413 return -ENOMEM; 414 } 415 416 __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++, 417 virt_to_page(xdp->data_hard_start), 418 XDP_PACKET_HEADROOM, size); 419 sinfo->xdp_frags_size += size; 420 xsk_buff_add_frag(xdp); 421 422 return 0; 423} 424 425/** 426 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring 427 * @rx_ring: Rx ring 428 * @budget: NAPI budget 429 * 430 * Returns amount of work completed 431 **/ 432int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) 433{ 434 unsigned int total_rx_bytes = 0, total_rx_packets = 0; 435 u16 next_to_process = rx_ring->next_to_process; 436 u16 next_to_clean = rx_ring->next_to_clean; 437 unsigned int xdp_res, xdp_xmit = 0; 438 struct xdp_buff *first = NULL; 439 u32 count = rx_ring->count; 440 struct bpf_prog *xdp_prog; 441 u32 entries_to_alloc; 442 bool failure = false; 443 444 if (next_to_process != next_to_clean) 445 first = *i40e_rx_bi(rx_ring, next_to_clean); 446 447 /* NB! xdp_prog will always be !NULL, due to the fact that 448 * this path is enabled by setting an XDP program. 449 */ 450 xdp_prog = READ_ONCE(rx_ring->xdp_prog); 451 452 while (likely(total_rx_packets < (unsigned int)budget)) { 453 union i40e_rx_desc *rx_desc; 454 unsigned int rx_packets; 455 unsigned int rx_bytes; 456 struct xdp_buff *bi; 457 unsigned int size; 458 u64 qword; 459 460 rx_desc = I40E_RX_DESC(rx_ring, next_to_process); 461 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); 462 463 /* This memory barrier is needed to keep us from reading 464 * any other fields out of the rx_desc until we have 465 * verified the descriptor has been written back. 466 */ 467 dma_rmb(); 468 469 if (i40e_rx_is_programming_status(qword)) { 470 i40e_clean_programming_status(rx_ring, 471 rx_desc->raw.qword[0], 472 qword); 473 bi = *i40e_rx_bi(rx_ring, next_to_process); 474 xsk_buff_free(bi); 475 if (++next_to_process == count) 476 next_to_process = 0; 477 continue; 478 } 479 480 size = FIELD_GET(I40E_RXD_QW1_LENGTH_PBUF_MASK, qword); 481 if (!size) 482 break; 483 484 bi = *i40e_rx_bi(rx_ring, next_to_process); 485 xsk_buff_set_size(bi, size); 486 xsk_buff_dma_sync_for_cpu(bi, rx_ring->xsk_pool); 487 488 if (!first) 489 first = bi; 490 else if (i40e_add_xsk_frag(rx_ring, first, bi, size)) 491 break; 492 493 if (++next_to_process == count) 494 next_to_process = 0; 495 496 if (i40e_is_non_eop(rx_ring, rx_desc)) 497 continue; 498 499 xdp_res = i40e_run_xdp_zc(rx_ring, first, xdp_prog); 500 i40e_handle_xdp_result_zc(rx_ring, first, rx_desc, &rx_packets, 501 &rx_bytes, xdp_res, &failure); 502 next_to_clean = next_to_process; 503 if (failure) 504 break; 505 total_rx_packets += rx_packets; 506 total_rx_bytes += rx_bytes; 507 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR); 508 first = NULL; 509 } 510 511 rx_ring->next_to_clean = next_to_clean; 512 rx_ring->next_to_process = next_to_process; 513 514 entries_to_alloc = I40E_DESC_UNUSED(rx_ring); 515 if (entries_to_alloc >= I40E_RX_BUFFER_WRITE) 516 failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc); 517 518 i40e_finalize_xdp_rx(rx_ring, xdp_xmit); 519 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); 520 521 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) { 522 if (failure || next_to_clean == rx_ring->next_to_use) 523 xsk_set_rx_need_wakeup(rx_ring->xsk_pool); 524 else 525 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool); 526 527 return (int)total_rx_packets; 528 } 529 return failure ? budget : (int)total_rx_packets; 530} 531 532static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 533 unsigned int *total_bytes) 534{ 535 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(desc); 536 struct i40e_tx_desc *tx_desc; 537 dma_addr_t dma; 538 539 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr); 540 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len); 541 542 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++); 543 tx_desc->buffer_addr = cpu_to_le64(dma); 544 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc->len, 0); 545 546 *total_bytes += desc->len; 547} 548 549static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc, 550 unsigned int *total_bytes) 551{ 552 u16 ntu = xdp_ring->next_to_use; 553 struct i40e_tx_desc *tx_desc; 554 dma_addr_t dma; 555 u32 i; 556 557 loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) { 558 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(&desc[i]); 559 560 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr); 561 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len); 562 563 tx_desc = I40E_TX_DESC(xdp_ring, ntu++); 564 tx_desc->buffer_addr = cpu_to_le64(dma); 565 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc[i].len, 0); 566 567 *total_bytes += desc[i].len; 568 } 569 570 xdp_ring->next_to_use = ntu; 571} 572 573static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts, 574 unsigned int *total_bytes) 575{ 576 u32 batched, leftover, i; 577 578 batched = nb_pkts & ~(PKTS_PER_BATCH - 1); 579 leftover = nb_pkts & (PKTS_PER_BATCH - 1); 580 for (i = 0; i < batched; i += PKTS_PER_BATCH) 581 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes); 582 for (i = batched; i < batched + leftover; i++) 583 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes); 584} 585 586static void i40e_set_rs_bit(struct i40e_ring *xdp_ring) 587{ 588 u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1; 589 struct i40e_tx_desc *tx_desc; 590 591 tx_desc = I40E_TX_DESC(xdp_ring, ntu); 592 tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT); 593} 594 595/** 596 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP 597 * @xdp_ring: XDP Tx ring 598 * @budget: NAPI budget 599 * 600 * Returns true if the work is finished. 601 **/ 602static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget) 603{ 604 struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs; 605 u32 nb_pkts, nb_processed = 0; 606 unsigned int total_bytes = 0; 607 608 nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget); 609 if (!nb_pkts) 610 return true; 611 612 if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) { 613 nb_processed = xdp_ring->count - xdp_ring->next_to_use; 614 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes); 615 xdp_ring->next_to_use = 0; 616 } 617 618 i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed, 619 &total_bytes); 620 621 /* Request an interrupt for the last frame and bump tail ptr. */ 622 i40e_set_rs_bit(xdp_ring); 623 i40e_xdp_ring_update_tail(xdp_ring); 624 625 i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes); 626 627 return nb_pkts < budget; 628} 629 630/** 631 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry 632 * @tx_ring: XDP Tx ring 633 * @tx_bi: Tx buffer info to clean 634 **/ 635static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring, 636 struct i40e_tx_buffer *tx_bi) 637{ 638 xdp_return_frame(tx_bi->xdpf); 639 tx_ring->xdp_tx_active--; 640 dma_unmap_single(tx_ring->dev, 641 dma_unmap_addr(tx_bi, dma), 642 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); 643 dma_unmap_len_set(tx_bi, len, 0); 644} 645 646/** 647 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries 648 * @vsi: Current VSI 649 * @tx_ring: XDP Tx ring 650 * 651 * Returns true if cleanup/transmission is done. 652 **/ 653bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring) 654{ 655 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 656 u32 i, completed_frames, xsk_frames = 0; 657 u32 head_idx = i40e_get_head(tx_ring); 658 struct i40e_tx_buffer *tx_bi; 659 unsigned int ntc; 660 661 if (head_idx < tx_ring->next_to_clean) 662 head_idx += tx_ring->count; 663 completed_frames = head_idx - tx_ring->next_to_clean; 664 665 if (completed_frames == 0) 666 goto out_xmit; 667 668 if (likely(!tx_ring->xdp_tx_active)) { 669 xsk_frames = completed_frames; 670 goto skip; 671 } 672 673 ntc = tx_ring->next_to_clean; 674 675 for (i = 0; i < completed_frames; i++) { 676 tx_bi = &tx_ring->tx_bi[ntc]; 677 678 if (tx_bi->xdpf) { 679 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 680 tx_bi->xdpf = NULL; 681 } else { 682 xsk_frames++; 683 } 684 685 if (++ntc >= tx_ring->count) 686 ntc = 0; 687 } 688 689skip: 690 tx_ring->next_to_clean += completed_frames; 691 if (unlikely(tx_ring->next_to_clean >= tx_ring->count)) 692 tx_ring->next_to_clean -= tx_ring->count; 693 694 if (xsk_frames) 695 xsk_tx_completed(bp, xsk_frames); 696 697 i40e_arm_wb(tx_ring, vsi, completed_frames); 698 699out_xmit: 700 if (xsk_uses_need_wakeup(tx_ring->xsk_pool)) 701 xsk_set_tx_need_wakeup(tx_ring->xsk_pool); 702 703 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring)); 704} 705 706/** 707 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup 708 * @dev: the netdevice 709 * @queue_id: queue id to wake up 710 * @flags: ignored in our case since we have Rx and Tx in the same NAPI. 711 * 712 * Returns <0 for errors, 0 otherwise. 713 **/ 714int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags) 715{ 716 struct i40e_netdev_priv *np = netdev_priv(dev); 717 struct i40e_vsi *vsi = np->vsi; 718 struct i40e_pf *pf = vsi->back; 719 struct i40e_ring *ring; 720 721 if (test_bit(__I40E_CONFIG_BUSY, pf->state)) 722 return -EAGAIN; 723 724 if (test_bit(__I40E_VSI_DOWN, vsi->state)) 725 return -ENETDOWN; 726 727 if (!i40e_enabled_xdp_vsi(vsi)) 728 return -EINVAL; 729 730 if (queue_id >= vsi->num_queue_pairs) 731 return -EINVAL; 732 733 if (!vsi->xdp_rings[queue_id]->xsk_pool) 734 return -EINVAL; 735 736 ring = vsi->xdp_rings[queue_id]; 737 738 /* The idea here is that if NAPI is running, mark a miss, so 739 * it will run again. If not, trigger an interrupt and 740 * schedule the NAPI from interrupt context. If NAPI would be 741 * scheduled here, the interrupt affinity would not be 742 * honored. 743 */ 744 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) 745 i40e_force_wb(vsi, ring->q_vector); 746 747 return 0; 748} 749 750void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring) 751{ 752 u16 ntc = rx_ring->next_to_clean; 753 u16 ntu = rx_ring->next_to_use; 754 755 while (ntc != ntu) { 756 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc); 757 758 xsk_buff_free(rx_bi); 759 ntc++; 760 if (ntc >= rx_ring->count) 761 ntc = 0; 762 } 763} 764 765/** 766 * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown 767 * @tx_ring: XDP Tx ring 768 **/ 769void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring) 770{ 771 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; 772 struct xsk_buff_pool *bp = tx_ring->xsk_pool; 773 struct i40e_tx_buffer *tx_bi; 774 u32 xsk_frames = 0; 775 776 while (ntc != ntu) { 777 tx_bi = &tx_ring->tx_bi[ntc]; 778 779 if (tx_bi->xdpf) 780 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi); 781 else 782 xsk_frames++; 783 784 tx_bi->xdpf = NULL; 785 786 ntc++; 787 if (ntc >= tx_ring->count) 788 ntc = 0; 789 } 790 791 if (xsk_frames) 792 xsk_tx_completed(bp, xsk_frames); 793} 794 795/** 796 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP 797 * buffer pool attached 798 * @vsi: vsi 799 * 800 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached 801 **/ 802bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi) 803{ 804 struct net_device *netdev = vsi->netdev; 805 int i; 806 807 for (i = 0; i < vsi->num_queue_pairs; i++) { 808 if (xsk_get_pool_from_qid(netdev, i)) 809 return true; 810 } 811 812 return false; 813} 814