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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 <net/xdp.h>7 8#include "ixgbe.h"9#include "ixgbe_txrx_common.h"10 11struct xsk_buff_pool *ixgbe_xsk_pool(struct ixgbe_adapter *adapter,12 struct ixgbe_ring *ring)13{14 bool xdp_on = READ_ONCE(adapter->xdp_prog);15 int qid = ring->ring_idx;16 17 if (!xdp_on || !test_bit(qid, adapter->af_xdp_zc_qps))18 return NULL;19 20 return xsk_get_pool_from_qid(adapter->netdev, qid);21}22 23static int ixgbe_xsk_pool_enable(struct ixgbe_adapter *adapter,24 struct xsk_buff_pool *pool,25 u16 qid)26{27 struct net_device *netdev = adapter->netdev;28 bool if_running;29 int err;30 31 if (qid >= adapter->num_rx_queues)32 return -EINVAL;33 34 if (qid >= netdev->real_num_rx_queues ||35 qid >= netdev->real_num_tx_queues)36 return -EINVAL;37 38 err = xsk_pool_dma_map(pool, &adapter->pdev->dev, IXGBE_RX_DMA_ATTR);39 if (err)40 return err;41 42 if_running = netif_running(adapter->netdev) &&43 ixgbe_enabled_xdp_adapter(adapter);44 45 if (if_running)46 ixgbe_txrx_ring_disable(adapter, qid);47 48 set_bit(qid, adapter->af_xdp_zc_qps);49 50 if (if_running) {51 ixgbe_txrx_ring_enable(adapter, qid);52 53 /* Kick start the NAPI context so that receiving will start */54 err = ixgbe_xsk_wakeup(adapter->netdev, qid, XDP_WAKEUP_RX);55 if (err) {56 clear_bit(qid, adapter->af_xdp_zc_qps);57 xsk_pool_dma_unmap(pool, IXGBE_RX_DMA_ATTR);58 return err;59 }60 }61 62 return 0;63}64 65static int ixgbe_xsk_pool_disable(struct ixgbe_adapter *adapter, u16 qid)66{67 struct xsk_buff_pool *pool;68 bool if_running;69 70 pool = xsk_get_pool_from_qid(adapter->netdev, qid);71 if (!pool)72 return -EINVAL;73 74 if_running = netif_running(adapter->netdev) &&75 ixgbe_enabled_xdp_adapter(adapter);76 77 if (if_running)78 ixgbe_txrx_ring_disable(adapter, qid);79 80 clear_bit(qid, adapter->af_xdp_zc_qps);81 xsk_pool_dma_unmap(pool, IXGBE_RX_DMA_ATTR);82 83 if (if_running)84 ixgbe_txrx_ring_enable(adapter, qid);85 86 return 0;87}88 89int ixgbe_xsk_pool_setup(struct ixgbe_adapter *adapter,90 struct xsk_buff_pool *pool,91 u16 qid)92{93 return pool ? ixgbe_xsk_pool_enable(adapter, pool, qid) :94 ixgbe_xsk_pool_disable(adapter, qid);95}96 97static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,98 struct ixgbe_ring *rx_ring,99 struct xdp_buff *xdp)100{101 int err, result = IXGBE_XDP_PASS;102 struct bpf_prog *xdp_prog;103 struct ixgbe_ring *ring;104 struct xdp_frame *xdpf;105 u32 act;106 107 xdp_prog = READ_ONCE(rx_ring->xdp_prog);108 act = bpf_prog_run_xdp(xdp_prog, xdp);109 110 if (likely(act == XDP_REDIRECT)) {111 err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);112 if (!err)113 return IXGBE_XDP_REDIR;114 if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS)115 result = IXGBE_XDP_EXIT;116 else117 result = IXGBE_XDP_CONSUMED;118 goto out_failure;119 }120 121 switch (act) {122 case XDP_PASS:123 break;124 case XDP_TX:125 xdpf = xdp_convert_buff_to_frame(xdp);126 if (unlikely(!xdpf))127 goto out_failure;128 ring = ixgbe_determine_xdp_ring(adapter);129 if (static_branch_unlikely(&ixgbe_xdp_locking_key))130 spin_lock(&ring->tx_lock);131 result = ixgbe_xmit_xdp_ring(ring, xdpf);132 if (static_branch_unlikely(&ixgbe_xdp_locking_key))133 spin_unlock(&ring->tx_lock);134 if (result == IXGBE_XDP_CONSUMED)135 goto out_failure;136 break;137 case XDP_DROP:138 result = IXGBE_XDP_CONSUMED;139 break;140 default:141 bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);142 fallthrough;143 case XDP_ABORTED:144 result = IXGBE_XDP_CONSUMED;145out_failure:146 trace_xdp_exception(rx_ring->netdev, xdp_prog, act);147 }148 return result;149}150 151bool ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)152{153 union ixgbe_adv_rx_desc *rx_desc;154 struct ixgbe_rx_buffer *bi;155 u16 i = rx_ring->next_to_use;156 dma_addr_t dma;157 bool ok = true;158 159 /* nothing to do */160 if (!count)161 return true;162 163 rx_desc = IXGBE_RX_DESC(rx_ring, i);164 bi = &rx_ring->rx_buffer_info[i];165 i -= rx_ring->count;166 167 do {168 bi->xdp = xsk_buff_alloc(rx_ring->xsk_pool);169 if (!bi->xdp) {170 ok = false;171 break;172 }173 174 dma = xsk_buff_xdp_get_dma(bi->xdp);175 176 /* Refresh the desc even if buffer_addrs didn't change177 * because each write-back erases this info.178 */179 rx_desc->read.pkt_addr = cpu_to_le64(dma);180 181 rx_desc++;182 bi++;183 i++;184 if (unlikely(!i)) {185 rx_desc = IXGBE_RX_DESC(rx_ring, 0);186 bi = rx_ring->rx_buffer_info;187 i -= rx_ring->count;188 }189 190 /* clear the length for the next_to_use descriptor */191 rx_desc->wb.upper.length = 0;192 193 count--;194 } while (count);195 196 i += rx_ring->count;197 198 if (rx_ring->next_to_use != i) {199 rx_ring->next_to_use = i;200 201 /* Force memory writes to complete before letting h/w202 * know there are new descriptors to fetch. (Only203 * applicable for weak-ordered memory model archs,204 * such as IA-64).205 */206 wmb();207 writel(i, rx_ring->tail);208 }209 210 return ok;211}212 213static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,214 const struct xdp_buff *xdp)215{216 unsigned int totalsize = xdp->data_end - xdp->data_meta;217 unsigned int metasize = xdp->data - xdp->data_meta;218 struct sk_buff *skb;219 220 net_prefetch(xdp->data_meta);221 222 /* allocate a skb to store the frags */223 skb = napi_alloc_skb(&rx_ring->q_vector->napi, totalsize);224 if (unlikely(!skb))225 return NULL;226 227 memcpy(__skb_put(skb, totalsize), xdp->data_meta,228 ALIGN(totalsize, sizeof(long)));229 230 if (metasize) {231 skb_metadata_set(skb, metasize);232 __skb_pull(skb, metasize);233 }234 235 return skb;236}237 238static void ixgbe_inc_ntc(struct ixgbe_ring *rx_ring)239{240 u32 ntc = rx_ring->next_to_clean + 1;241 242 ntc = (ntc < rx_ring->count) ? ntc : 0;243 rx_ring->next_to_clean = ntc;244 prefetch(IXGBE_RX_DESC(rx_ring, ntc));245}246 247int ixgbe_clean_rx_irq_zc(struct ixgbe_q_vector *q_vector,248 struct ixgbe_ring *rx_ring,249 const int budget)250{251 unsigned int total_rx_bytes = 0, total_rx_packets = 0;252 struct ixgbe_adapter *adapter = q_vector->adapter;253 u16 cleaned_count = ixgbe_desc_unused(rx_ring);254 unsigned int xdp_res, xdp_xmit = 0;255 bool failure = false;256 struct sk_buff *skb;257 258 while (likely(total_rx_packets < budget)) {259 union ixgbe_adv_rx_desc *rx_desc;260 struct ixgbe_rx_buffer *bi;261 unsigned int size;262 263 /* return some buffers to hardware, one at a time is too slow */264 if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {265 failure = failure ||266 !ixgbe_alloc_rx_buffers_zc(rx_ring,267 cleaned_count);268 cleaned_count = 0;269 }270 271 rx_desc = IXGBE_RX_DESC(rx_ring, rx_ring->next_to_clean);272 size = le16_to_cpu(rx_desc->wb.upper.length);273 if (!size)274 break;275 276 /* This memory barrier is needed to keep us from reading277 * any other fields out of the rx_desc until we know the278 * descriptor has been written back279 */280 dma_rmb();281 282 bi = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];283 284 if (unlikely(!ixgbe_test_staterr(rx_desc,285 IXGBE_RXD_STAT_EOP))) {286 struct ixgbe_rx_buffer *next_bi;287 288 xsk_buff_free(bi->xdp);289 bi->xdp = NULL;290 ixgbe_inc_ntc(rx_ring);291 next_bi =292 &rx_ring->rx_buffer_info[rx_ring->next_to_clean];293 next_bi->discard = true;294 continue;295 }296 297 if (unlikely(bi->discard)) {298 xsk_buff_free(bi->xdp);299 bi->xdp = NULL;300 bi->discard = false;301 ixgbe_inc_ntc(rx_ring);302 continue;303 }304 305 bi->xdp->data_end = bi->xdp->data + size;306 xsk_buff_dma_sync_for_cpu(bi->xdp);307 xdp_res = ixgbe_run_xdp_zc(adapter, rx_ring, bi->xdp);308 309 if (likely(xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR))) {310 xdp_xmit |= xdp_res;311 } else if (xdp_res == IXGBE_XDP_EXIT) {312 failure = true;313 break;314 } else if (xdp_res == IXGBE_XDP_CONSUMED) {315 xsk_buff_free(bi->xdp);316 } else if (xdp_res == IXGBE_XDP_PASS) {317 goto construct_skb;318 }319 320 bi->xdp = NULL;321 total_rx_packets++;322 total_rx_bytes += size;323 324 cleaned_count++;325 ixgbe_inc_ntc(rx_ring);326 continue;327 328construct_skb:329 /* XDP_PASS path */330 skb = ixgbe_construct_skb_zc(rx_ring, bi->xdp);331 if (!skb) {332 rx_ring->rx_stats.alloc_rx_buff_failed++;333 break;334 }335 336 xsk_buff_free(bi->xdp);337 bi->xdp = NULL;338 339 cleaned_count++;340 ixgbe_inc_ntc(rx_ring);341 342 if (eth_skb_pad(skb))343 continue;344 345 total_rx_bytes += skb->len;346 total_rx_packets++;347 348 ixgbe_process_skb_fields(rx_ring, rx_desc, skb);349 ixgbe_rx_skb(q_vector, skb);350 }351 352 if (xdp_xmit & IXGBE_XDP_REDIR)353 xdp_do_flush();354 355 if (xdp_xmit & IXGBE_XDP_TX) {356 struct ixgbe_ring *ring = ixgbe_determine_xdp_ring(adapter);357 358 ixgbe_xdp_ring_update_tail_locked(ring);359 }360 361 ixgbe_update_rx_ring_stats(rx_ring, q_vector, total_rx_packets,362 total_rx_bytes);363 364 if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {365 if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)366 xsk_set_rx_need_wakeup(rx_ring->xsk_pool);367 else368 xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);369 370 return (int)total_rx_packets;371 }372 return failure ? budget : (int)total_rx_packets;373}374 375void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring)376{377 struct ixgbe_rx_buffer *bi;378 u16 i;379 380 for (i = 0; i < rx_ring->count; i++) {381 bi = &rx_ring->rx_buffer_info[i];382 383 if (!bi->xdp)384 continue;385 386 xsk_buff_free(bi->xdp);387 bi->xdp = NULL;388 }389}390 391static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)392{393 struct xsk_buff_pool *pool = xdp_ring->xsk_pool;394 union ixgbe_adv_tx_desc *tx_desc = NULL;395 struct ixgbe_tx_buffer *tx_bi;396 bool work_done = true;397 struct xdp_desc desc;398 dma_addr_t dma;399 u32 cmd_type;400 401 while (budget-- > 0) {402 if (unlikely(!ixgbe_desc_unused(xdp_ring))) {403 work_done = false;404 break;405 }406 407 if (!netif_carrier_ok(xdp_ring->netdev))408 break;409 410 if (!xsk_tx_peek_desc(pool, &desc))411 break;412 413 dma = xsk_buff_raw_get_dma(pool, desc.addr);414 xsk_buff_raw_dma_sync_for_device(pool, dma, desc.len);415 416 tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use];417 tx_bi->bytecount = desc.len;418 tx_bi->xdpf = NULL;419 tx_bi->gso_segs = 1;420 421 tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use);422 tx_desc->read.buffer_addr = cpu_to_le64(dma);423 424 /* put descriptor type bits */425 cmd_type = IXGBE_ADVTXD_DTYP_DATA |426 IXGBE_ADVTXD_DCMD_DEXT |427 IXGBE_ADVTXD_DCMD_IFCS;428 cmd_type |= desc.len | IXGBE_TXD_CMD;429 tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);430 tx_desc->read.olinfo_status =431 cpu_to_le32(desc.len << IXGBE_ADVTXD_PAYLEN_SHIFT);432 433 xdp_ring->next_to_use++;434 if (xdp_ring->next_to_use == xdp_ring->count)435 xdp_ring->next_to_use = 0;436 }437 438 if (tx_desc) {439 ixgbe_xdp_ring_update_tail(xdp_ring);440 xsk_tx_release(pool);441 }442 443 return !!budget && work_done;444}445 446static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring,447 struct ixgbe_tx_buffer *tx_bi)448{449 xdp_return_frame(tx_bi->xdpf);450 dma_unmap_single(tx_ring->dev,451 dma_unmap_addr(tx_bi, dma),452 dma_unmap_len(tx_bi, len), DMA_TO_DEVICE);453 dma_unmap_len_set(tx_bi, len, 0);454}455 456bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector,457 struct ixgbe_ring *tx_ring, int napi_budget)458{459 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;460 unsigned int total_packets = 0, total_bytes = 0;461 struct xsk_buff_pool *pool = tx_ring->xsk_pool;462 union ixgbe_adv_tx_desc *tx_desc;463 struct ixgbe_tx_buffer *tx_bi;464 u32 xsk_frames = 0;465 466 tx_bi = &tx_ring->tx_buffer_info[ntc];467 tx_desc = IXGBE_TX_DESC(tx_ring, ntc);468 469 while (ntc != ntu) {470 if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))471 break;472 473 total_bytes += tx_bi->bytecount;474 total_packets += tx_bi->gso_segs;475 476 if (tx_bi->xdpf)477 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);478 else479 xsk_frames++;480 481 tx_bi->xdpf = NULL;482 483 tx_bi++;484 tx_desc++;485 ntc++;486 if (unlikely(ntc == tx_ring->count)) {487 ntc = 0;488 tx_bi = tx_ring->tx_buffer_info;489 tx_desc = IXGBE_TX_DESC(tx_ring, 0);490 }491 492 /* issue prefetch for next Tx descriptor */493 prefetch(tx_desc);494 }495 496 tx_ring->next_to_clean = ntc;497 ixgbe_update_tx_ring_stats(tx_ring, q_vector, total_packets,498 total_bytes);499 500 if (xsk_frames)501 xsk_tx_completed(pool, xsk_frames);502 503 if (xsk_uses_need_wakeup(pool))504 xsk_set_tx_need_wakeup(pool);505 506 return ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit);507}508 509int ixgbe_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)510{511 struct ixgbe_adapter *adapter = netdev_priv(dev);512 struct ixgbe_ring *ring;513 514 if (test_bit(__IXGBE_DOWN, &adapter->state))515 return -ENETDOWN;516 517 if (!READ_ONCE(adapter->xdp_prog))518 return -EINVAL;519 520 if (qid >= adapter->num_xdp_queues)521 return -EINVAL;522 523 ring = adapter->xdp_ring[qid];524 525 if (test_bit(__IXGBE_TX_DISABLED, &ring->state))526 return -ENETDOWN;527 528 if (!ring->xsk_pool)529 return -EINVAL;530 531 if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) {532 u64 eics = BIT_ULL(ring->q_vector->v_idx);533 534 ixgbe_irq_rearm_queues(adapter, eics);535 }536 537 return 0;538}539 540void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring)541{542 u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use;543 struct xsk_buff_pool *pool = tx_ring->xsk_pool;544 struct ixgbe_tx_buffer *tx_bi;545 u32 xsk_frames = 0;546 547 while (ntc != ntu) {548 tx_bi = &tx_ring->tx_buffer_info[ntc];549 550 if (tx_bi->xdpf)551 ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi);552 else553 xsk_frames++;554 555 tx_bi->xdpf = NULL;556 557 ntc++;558 if (ntc == tx_ring->count)559 ntc = 0;560 }561 562 if (xsk_frames)563 xsk_tx_completed(pool, xsk_frames);564}565