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1// SPDX-License-Identifier: GPL-2.02/* 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 buffer22 * @rx_ring: Current rx ring23 * @pool_present: is pool for XSK present24 *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 failure28 */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 rings52 * @vsi: Current VSI53 * @zc: is zero copy set54 *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 failure58 */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 a74 * certain ring/qid75 * @vsi: Current VSI76 * @pool: buffer pool77 * @qid: Rx ring to associate buffer pool with78 *79 * Returns 0 on success, <0 on failure80 **/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 a131 * certain ring/qid132 * @vsi: Current VSI133 * @qid: Rx ring to associate buffer pool with134 *135 * Returns 0 on success, <0 on failure136 **/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/from173 * a ring/qid174 * @vsi: Current VSI175 * @pool: Buffer pool to enable/associate to a ring, or NULL to disable176 * @qid: Rx ring to (dis)associate buffer pool (from)to177 *178 * This function enables or disables a buffer pool to a certain ring.179 *180 * Returns 0 on success, <0 on failure181 **/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_buff191 * @rx_ring: Rx ring192 * @xdp: xdp_buff used as input to the XDP program193 * @xdp_prog: XDP program to run194 *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 else213 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 buffer281 * @rx_ring: Rx ring282 * @xdp: xdp_buff283 *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 if (unlikely(!skb))306 goto out;307 308 memcpy(__skb_put(skb, totalsize), xdp->data_meta,309 ALIGN(totalsize, sizeof(long)));310 311 if (metasize) {312 skb_metadata_set(skb, metasize);313 __skb_pull(skb, metasize);314 }315 316 if (likely(!xdp_buff_has_frags(xdp)))317 goto out;318 319 for (int i = 0; i < nr_frags; i++) {320 struct skb_shared_info *skinfo = skb_shinfo(skb);321 skb_frag_t *frag = &sinfo->frags[i];322 struct page *page;323 void *addr;324 325 page = dev_alloc_page();326 if (!page) {327 dev_kfree_skb(skb);328 return NULL;329 }330 addr = page_to_virt(page);331 332 memcpy(addr, skb_frag_page(frag), skb_frag_size(frag));333 334 __skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++,335 addr, 0, skb_frag_size(frag));336 }337 338out:339 xsk_buff_free(xdp);340 return skb;341}342 343static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,344 struct xdp_buff *xdp_buff,345 union i40e_rx_desc *rx_desc,346 unsigned int *rx_packets,347 unsigned int *rx_bytes,348 unsigned int xdp_res,349 bool *failure)350{351 struct sk_buff *skb;352 353 *rx_packets = 1;354 *rx_bytes = xdp_get_buff_len(xdp_buff);355 356 if (likely(xdp_res == I40E_XDP_REDIR) || xdp_res == I40E_XDP_TX)357 return;358 359 if (xdp_res == I40E_XDP_EXIT) {360 *failure = true;361 return;362 }363 364 if (xdp_res == I40E_XDP_CONSUMED) {365 xsk_buff_free(xdp_buff);366 return;367 }368 if (xdp_res == I40E_XDP_PASS) {369 /* NB! We are not checking for errors using370 * i40e_test_staterr with371 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that372 * SBP is *not* set in PRT_SBPVSI (default not set).373 */374 skb = i40e_construct_skb_zc(rx_ring, xdp_buff);375 if (!skb) {376 rx_ring->rx_stats.alloc_buff_failed++;377 *rx_packets = 0;378 *rx_bytes = 0;379 return;380 }381 382 if (eth_skb_pad(skb)) {383 *rx_packets = 0;384 *rx_bytes = 0;385 return;386 }387 388 i40e_process_skb_fields(rx_ring, rx_desc, skb);389 napi_gro_receive(&rx_ring->q_vector->napi, skb);390 return;391 }392 393 /* Should never get here, as all valid cases have been handled already.394 */395 WARN_ON_ONCE(1);396}397 398static int399i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first,400 struct xdp_buff *xdp, const unsigned int size)401{402 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first);403 404 if (!xdp_buff_has_frags(first)) {405 sinfo->nr_frags = 0;406 sinfo->xdp_frags_size = 0;407 xdp_buff_set_frags_flag(first);408 }409 410 if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) {411 xsk_buff_free(first);412 return -ENOMEM;413 }414 415 __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++,416 virt_to_page(xdp->data_hard_start),417 XDP_PACKET_HEADROOM, size);418 sinfo->xdp_frags_size += size;419 xsk_buff_add_frag(xdp);420 421 return 0;422}423 424/**425 * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring426 * @rx_ring: Rx ring427 * @budget: NAPI budget428 *429 * Returns amount of work completed430 **/431int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)432{433 unsigned int total_rx_bytes = 0, total_rx_packets = 0;434 u16 next_to_process = rx_ring->next_to_process;435 u16 next_to_clean = rx_ring->next_to_clean;436 unsigned int xdp_res, xdp_xmit = 0;437 struct xdp_buff *first = NULL;438 u32 count = rx_ring->count;439 struct bpf_prog *xdp_prog;440 u32 entries_to_alloc;441 bool failure = false;442 443 if (next_to_process != next_to_clean)444 first = *i40e_rx_bi(rx_ring, next_to_clean);445 446 /* NB! xdp_prog will always be !NULL, due to the fact that447 * this path is enabled by setting an XDP program.448 */449 xdp_prog = READ_ONCE(rx_ring->xdp_prog);450 451 while (likely(total_rx_packets < (unsigned int)budget)) {452 union i40e_rx_desc *rx_desc;453 unsigned int rx_packets;454 unsigned int rx_bytes;455 struct xdp_buff *bi;456 unsigned int size;457 u64 qword;458 459 rx_desc = I40E_RX_DESC(rx_ring, next_to_process);460 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len);461 462 /* This memory barrier is needed to keep us from reading463 * any other fields out of the rx_desc until we have464 * verified the descriptor has been written back.465 */466 dma_rmb();467 468 if (i40e_rx_is_programming_status(qword)) {469 i40e_clean_programming_status(rx_ring,470 rx_desc->raw.qword[0],471 qword);472 bi = *i40e_rx_bi(rx_ring, next_to_process);473 xsk_buff_free(bi);474 if (++next_to_process == count)475 next_to_process = 0;476 continue;477 }478 479 size = FIELD_GET(I40E_RXD_QW1_LENGTH_PBUF_MASK, qword);480 if (!size)481 break;482 483 bi = *i40e_rx_bi(rx_ring, next_to_process);484 xsk_buff_set_size(bi, size);485 xsk_buff_dma_sync_for_cpu(bi);486 487 if (!first)488 first = bi;489 else if (i40e_add_xsk_frag(rx_ring, first, bi, size))490 break;491 492 if (++next_to_process == count)493 next_to_process = 0;494 495 if (i40e_is_non_eop(rx_ring, rx_desc))496 continue;497 498 xdp_res = i40e_run_xdp_zc(rx_ring, first, xdp_prog);499 i40e_handle_xdp_result_zc(rx_ring, first, rx_desc, &rx_packets,500 &rx_bytes, xdp_res, &failure);501 next_to_clean = next_to_process;502 if (failure)503 break;504 total_rx_packets += rx_packets;505 total_rx_bytes += rx_bytes;506 xdp_xmit |= xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR);507 first = NULL;508 }509 510 rx_ring->next_to_clean = next_to_clean;511 rx_ring->next_to_process = next_to_process;512 513 entries_to_alloc = I40E_DESC_UNUSED(rx_ring);514 if (entries_to_alloc >= I40E_RX_BUFFER_WRITE)515 failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc);516 517 i40e_finalize_xdp_rx(rx_ring, xdp_xmit);518 i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);519 520 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {521 if (failure || next_to_clean == rx_ring->next_to_use)522 xsk_set_rx_need_wakeup(rx_ring->xsk_pool);523 else524 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);525 526 return (int)total_rx_packets;527 }528 return failure ? budget : (int)total_rx_packets;529}530 531static void i40e_xmit_pkt(struct i40e_ring *xdp_ring, struct xdp_desc *desc,532 unsigned int *total_bytes)533{534 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(desc);535 struct i40e_tx_desc *tx_desc;536 dma_addr_t dma;537 538 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);539 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);540 541 tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use++);542 tx_desc->buffer_addr = cpu_to_le64(dma);543 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc->len, 0);544 545 *total_bytes += desc->len;546}547 548static void i40e_xmit_pkt_batch(struct i40e_ring *xdp_ring, struct xdp_desc *desc,549 unsigned int *total_bytes)550{551 u16 ntu = xdp_ring->next_to_use;552 struct i40e_tx_desc *tx_desc;553 dma_addr_t dma;554 u32 i;555 556 loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {557 u32 cmd = I40E_TX_DESC_CMD_ICRC | xsk_is_eop_desc(&desc[i]);558 559 dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc[i].addr);560 xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc[i].len);561 562 tx_desc = I40E_TX_DESC(xdp_ring, ntu++);563 tx_desc->buffer_addr = cpu_to_le64(dma);564 tx_desc->cmd_type_offset_bsz = build_ctob(cmd, 0, desc[i].len, 0);565 566 *total_bytes += desc[i].len;567 }568 569 xdp_ring->next_to_use = ntu;570}571 572static void i40e_fill_tx_hw_ring(struct i40e_ring *xdp_ring, struct xdp_desc *descs, u32 nb_pkts,573 unsigned int *total_bytes)574{575 u32 batched, leftover, i;576 577 batched = nb_pkts & ~(PKTS_PER_BATCH - 1);578 leftover = nb_pkts & (PKTS_PER_BATCH - 1);579 for (i = 0; i < batched; i += PKTS_PER_BATCH)580 i40e_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);581 for (i = batched; i < batched + leftover; i++)582 i40e_xmit_pkt(xdp_ring, &descs[i], total_bytes);583}584 585static void i40e_set_rs_bit(struct i40e_ring *xdp_ring)586{587 u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;588 struct i40e_tx_desc *tx_desc;589 590 tx_desc = I40E_TX_DESC(xdp_ring, ntu);591 tx_desc->cmd_type_offset_bsz |= cpu_to_le64(I40E_TX_DESC_CMD_RS << I40E_TXD_QW1_CMD_SHIFT);592}593 594/**595 * i40e_xmit_zc - Performs zero-copy Tx AF_XDP596 * @xdp_ring: XDP Tx ring597 * @budget: NAPI budget598 *599 * Returns true if the work is finished.600 **/601static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)602{603 struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;604 u32 nb_pkts, nb_processed = 0;605 unsigned int total_bytes = 0;606 607 nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);608 if (!nb_pkts)609 return true;610 611 if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {612 nb_processed = xdp_ring->count - xdp_ring->next_to_use;613 i40e_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);614 xdp_ring->next_to_use = 0;615 }616 617 i40e_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,618 &total_bytes);619 620 /* Request an interrupt for the last frame and bump tail ptr. */621 i40e_set_rs_bit(xdp_ring);622 i40e_xdp_ring_update_tail(xdp_ring);623 624 i40e_update_tx_stats(xdp_ring, nb_pkts, total_bytes);625 626 return nb_pkts < budget;627}628 629/**630 * i40e_clean_xdp_tx_buffer - Frees and unmaps an XDP Tx entry631 * @tx_ring: XDP Tx ring632 * @tx_bi: Tx buffer info to clean633 **/634static void i40e_clean_xdp_tx_buffer(struct i40e_ring *tx_ring,635 struct i40e_tx_buffer *tx_bi)636{637 xdp_return_frame(tx_bi->xdpf);638 tx_ring->xdp_tx_active--;639 dma_unmap_single(tx_ring->dev,640 dma_unmap_addr(tx_bi, dma),641 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);642 dma_unmap_len_set(tx_bi, len, 0);643}644 645/**646 * i40e_clean_xdp_tx_irq - Completes AF_XDP entries, and cleans XDP entries647 * @vsi: Current VSI648 * @tx_ring: XDP Tx ring649 *650 * Returns true if cleanup/transmission is done.651 **/652bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, struct i40e_ring *tx_ring)653{654 struct xsk_buff_pool *bp = tx_ring->xsk_pool;655 u32 i, completed_frames, xsk_frames = 0;656 u32 head_idx = i40e_get_head(tx_ring);657 struct i40e_tx_buffer *tx_bi;658 unsigned int ntc;659 660 if (head_idx < tx_ring->next_to_clean)661 head_idx += tx_ring->count;662 completed_frames = head_idx - tx_ring->next_to_clean;663 664 if (completed_frames == 0)665 goto out_xmit;666 667 if (likely(!tx_ring->xdp_tx_active)) {668 xsk_frames = completed_frames;669 goto skip;670 }671 672 ntc = tx_ring->next_to_clean;673 674 for (i = 0; i < completed_frames; i++) {675 tx_bi = &tx_ring->tx_bi[ntc];676 677 if (tx_bi->xdpf) {678 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);679 tx_bi->xdpf = NULL;680 } else {681 xsk_frames++;682 }683 684 if (++ntc >= tx_ring->count)685 ntc = 0;686 }687 688skip:689 tx_ring->next_to_clean += completed_frames;690 if (unlikely(tx_ring->next_to_clean >= tx_ring->count))691 tx_ring->next_to_clean -= tx_ring->count;692 693 if (xsk_frames)694 xsk_tx_completed(bp, xsk_frames);695 696 i40e_arm_wb(tx_ring, vsi, completed_frames);697 698out_xmit:699 if (xsk_uses_need_wakeup(tx_ring->xsk_pool))700 xsk_set_tx_need_wakeup(tx_ring->xsk_pool);701 702 return i40e_xmit_zc(tx_ring, I40E_DESC_UNUSED(tx_ring));703}704 705/**706 * i40e_xsk_wakeup - Implements the ndo_xsk_wakeup707 * @dev: the netdevice708 * @queue_id: queue id to wake up709 * @flags: ignored in our case since we have Rx and Tx in the same NAPI.710 *711 * Returns <0 for errors, 0 otherwise.712 **/713int i40e_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)714{715 struct i40e_netdev_priv *np = netdev_priv(dev);716 struct i40e_vsi *vsi = np->vsi;717 struct i40e_pf *pf = vsi->back;718 struct i40e_ring *ring;719 720 if (test_bit(__I40E_CONFIG_BUSY, pf->state))721 return -EAGAIN;722 723 if (test_bit(__I40E_VSI_DOWN, vsi->state))724 return -ENETDOWN;725 726 if (!i40e_enabled_xdp_vsi(vsi))727 return -EINVAL;728 729 if (queue_id >= vsi->num_queue_pairs)730 return -EINVAL;731 732 if (!vsi->xdp_rings[queue_id]->xsk_pool)733 return -EINVAL;734 735 ring = vsi->xdp_rings[queue_id];736 737 /* The idea here is that if NAPI is running, mark a miss, so738 * it will run again. If not, trigger an interrupt and739 * schedule the NAPI from interrupt context. If NAPI would be740 * scheduled here, the interrupt affinity would not be741 * honored.742 */743 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi))744 i40e_force_wb(vsi, ring->q_vector);745 746 return 0;747}748 749void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)750{751 u16 ntc = rx_ring->next_to_clean;752 u16 ntu = rx_ring->next_to_use;753 754 while (ntc != ntu) {755 struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, ntc);756 757 xsk_buff_free(rx_bi);758 ntc++;759 if (ntc >= rx_ring->count)760 ntc = 0;761 }762}763 764/**765 * i40e_xsk_clean_tx_ring - Clean the XDP Tx ring on shutdown766 * @tx_ring: XDP Tx ring767 **/768void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)769{770 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;771 struct xsk_buff_pool *bp = tx_ring->xsk_pool;772 struct i40e_tx_buffer *tx_bi;773 u32 xsk_frames = 0;774 775 while (ntc != ntu) {776 tx_bi = &tx_ring->tx_bi[ntc];777 778 if (tx_bi->xdpf)779 i40e_clean_xdp_tx_buffer(tx_ring, tx_bi);780 else781 xsk_frames++;782 783 tx_bi->xdpf = NULL;784 785 ntc++;786 if (ntc >= tx_ring->count)787 ntc = 0;788 }789 790 if (xsk_frames)791 xsk_tx_completed(bp, xsk_frames);792}793 794/**795 * i40e_xsk_any_rx_ring_enabled - Checks if Rx rings have an AF_XDP796 * buffer pool attached797 * @vsi: vsi798 *799 * Returns true if any of the Rx rings has an AF_XDP buffer pool attached800 **/801bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)802{803 struct net_device *netdev = vsi->netdev;804 int i;805 806 for (i = 0; i < vsi->num_queue_pairs; i++) {807 if (xsk_get_pool_from_qid(netdev, i))808 return true;809 }810 811 return false;812}813