1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2015-2019 Netronome Systems, Inc. */ 3 4 #include <linux/bpf_trace.h> 5 #include <linux/netdevice.h> 6 7 #include "../nfp_app.h" 8 #include "../nfp_net.h" 9 #include "../nfp_net_dp.h" 10 #include "../nfp_net_xsk.h" 11 #include "../crypto/crypto.h" 12 #include "../crypto/fw.h" 13 #include "nfd3.h" 14 15 /* Transmit processing 16 * 17 * One queue controller peripheral queue is used for transmit. The 18 * driver en-queues packets for transmit by advancing the write 19 * pointer. The device indicates that packets have transmitted by 20 * advancing the read pointer. The driver maintains a local copy of 21 * the read and write pointer in @struct nfp_net_tx_ring. The driver 22 * keeps @wr_p in sync with the queue controller write pointer and can 23 * determine how many packets have been transmitted by comparing its 24 * copy of the read pointer @rd_p with the read pointer maintained by 25 * the queue controller peripheral. 26 */ 27 28 /* Wrappers for deciding when to stop and restart TX queues */ 29 static int nfp_nfd3_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) 30 { 31 return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4); 32 } 33 34 static int nfp_nfd3_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) 35 { 36 return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1); 37 } 38 39 /** 40 * nfp_nfd3_tx_ring_stop() - stop tx ring 41 * @nd_q: netdev queue 42 * @tx_ring: driver tx queue structure 43 * 44 * Safely stop TX ring. Remember that while we are running .start_xmit() 45 * someone else may be cleaning the TX ring completions so we need to be 46 * extra careful here. 47 */ 48 static void 49 nfp_nfd3_tx_ring_stop(struct netdev_queue *nd_q, 50 struct nfp_net_tx_ring *tx_ring) 51 { 52 netif_tx_stop_queue(nd_q); 53 54 /* We can race with the TX completion out of NAPI so recheck */ 55 smp_mb(); 56 if (unlikely(nfp_nfd3_tx_ring_should_wake(tx_ring))) 57 netif_tx_start_queue(nd_q); 58 } 59 60 /** 61 * nfp_nfd3_tx_tso() - Set up Tx descriptor for LSO 62 * @r_vec: per-ring structure 63 * @txbuf: Pointer to driver soft TX descriptor 64 * @txd: Pointer to HW TX descriptor 65 * @skb: Pointer to SKB 66 * @md_bytes: Prepend length 67 * 68 * Set up Tx descriptor for LSO, do nothing for non-LSO skbs. 69 * Return error on packet header greater than maximum supported LSO header size. 70 */ 71 static void 72 nfp_nfd3_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfd3_tx_buf *txbuf, 73 struct nfp_nfd3_tx_desc *txd, struct sk_buff *skb, u32 md_bytes) 74 { 75 u32 l3_offset, l4_offset, hdrlen; 76 u16 mss; 77 78 if (!skb_is_gso(skb)) 79 return; 80 81 if (!skb->encapsulation) { 82 l3_offset = skb_network_offset(skb); 83 l4_offset = skb_transport_offset(skb); 84 hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 85 } else { 86 l3_offset = skb_inner_network_offset(skb); 87 l4_offset = skb_inner_transport_offset(skb); 88 hdrlen = skb_inner_transport_header(skb) - skb->data + 89 inner_tcp_hdrlen(skb); 90 } 91 92 txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs; 93 txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1); 94 95 mss = skb_shinfo(skb)->gso_size & NFD3_DESC_TX_MSS_MASK; 96 txd->l3_offset = l3_offset - md_bytes; 97 txd->l4_offset = l4_offset - md_bytes; 98 txd->lso_hdrlen = hdrlen - md_bytes; 99 txd->mss = cpu_to_le16(mss); 100 txd->flags |= NFD3_DESC_TX_LSO; 101 102 u64_stats_update_begin(&r_vec->tx_sync); 103 r_vec->tx_lso++; 104 u64_stats_update_end(&r_vec->tx_sync); 105 } 106 107 /** 108 * nfp_nfd3_tx_csum() - Set TX CSUM offload flags in TX descriptor 109 * @dp: NFP Net data path struct 110 * @r_vec: per-ring structure 111 * @txbuf: Pointer to driver soft TX descriptor 112 * @txd: Pointer to TX descriptor 113 * @skb: Pointer to SKB 114 * 115 * This function sets the TX checksum flags in the TX descriptor based 116 * on the configuration and the protocol of the packet to be transmitted. 117 */ 118 static void 119 nfp_nfd3_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 120 struct nfp_nfd3_tx_buf *txbuf, struct nfp_nfd3_tx_desc *txd, 121 struct sk_buff *skb) 122 { 123 struct ipv6hdr *ipv6h; 124 struct iphdr *iph; 125 u8 l4_hdr; 126 127 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) 128 return; 129 130 if (skb->ip_summed != CHECKSUM_PARTIAL) 131 return; 132 133 txd->flags |= NFD3_DESC_TX_CSUM; 134 if (skb->encapsulation) 135 txd->flags |= NFD3_DESC_TX_ENCAP; 136 137 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); 138 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); 139 140 if (iph->version == 4) { 141 txd->flags |= NFD3_DESC_TX_IP4_CSUM; 142 l4_hdr = iph->protocol; 143 } else if (ipv6h->version == 6) { 144 l4_hdr = ipv6h->nexthdr; 145 } else { 146 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); 147 return; 148 } 149 150 switch (l4_hdr) { 151 case IPPROTO_TCP: 152 txd->flags |= NFD3_DESC_TX_TCP_CSUM; 153 break; 154 case IPPROTO_UDP: 155 txd->flags |= NFD3_DESC_TX_UDP_CSUM; 156 break; 157 default: 158 nn_dp_warn(dp, "partial checksum but l4 proto=%x!\n", l4_hdr); 159 return; 160 } 161 162 u64_stats_update_begin(&r_vec->tx_sync); 163 if (skb->encapsulation) 164 r_vec->hw_csum_tx_inner += txbuf->pkt_cnt; 165 else 166 r_vec->hw_csum_tx += txbuf->pkt_cnt; 167 u64_stats_update_end(&r_vec->tx_sync); 168 } 169 170 static int nfp_nfd3_prep_tx_meta(struct sk_buff *skb, u64 tls_handle) 171 { 172 struct metadata_dst *md_dst = skb_metadata_dst(skb); 173 unsigned char *data; 174 u32 meta_id = 0; 175 int md_bytes; 176 177 if (likely(!md_dst && !tls_handle)) 178 return 0; 179 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) { 180 if (!tls_handle) 181 return 0; 182 md_dst = NULL; 183 } 184 185 md_bytes = 4 + !!md_dst * 4 + !!tls_handle * 8; 186 187 if (unlikely(skb_cow_head(skb, md_bytes))) 188 return -ENOMEM; 189 190 meta_id = 0; 191 data = skb_push(skb, md_bytes) + md_bytes; 192 if (md_dst) { 193 data -= 4; 194 put_unaligned_be32(md_dst->u.port_info.port_id, data); 195 meta_id = NFP_NET_META_PORTID; 196 } 197 if (tls_handle) { 198 /* conn handle is opaque, we just use u64 to be able to quickly 199 * compare it to zero 200 */ 201 data -= 8; 202 memcpy(data, &tls_handle, sizeof(tls_handle)); 203 meta_id <<= NFP_NET_META_FIELD_SIZE; 204 meta_id |= NFP_NET_META_CONN_HANDLE; 205 } 206 207 data -= 4; 208 put_unaligned_be32(meta_id, data); 209 210 return md_bytes; 211 } 212 213 /** 214 * nfp_nfd3_tx() - Main transmit entry point 215 * @skb: SKB to transmit 216 * @netdev: netdev structure 217 * 218 * Return: NETDEV_TX_OK on success. 219 */ 220 netdev_tx_t nfp_nfd3_tx(struct sk_buff *skb, struct net_device *netdev) 221 { 222 struct nfp_net *nn = netdev_priv(netdev); 223 int f, nr_frags, wr_idx, md_bytes; 224 struct nfp_net_tx_ring *tx_ring; 225 struct nfp_net_r_vector *r_vec; 226 struct nfp_nfd3_tx_buf *txbuf; 227 struct nfp_nfd3_tx_desc *txd; 228 struct netdev_queue *nd_q; 229 const skb_frag_t *frag; 230 struct nfp_net_dp *dp; 231 dma_addr_t dma_addr; 232 unsigned int fsize; 233 u64 tls_handle = 0; 234 u16 qidx; 235 236 dp = &nn->dp; 237 qidx = skb_get_queue_mapping(skb); 238 tx_ring = &dp->tx_rings[qidx]; 239 r_vec = tx_ring->r_vec; 240 241 nr_frags = skb_shinfo(skb)->nr_frags; 242 243 if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) { 244 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", 245 qidx, tx_ring->wr_p, tx_ring->rd_p); 246 nd_q = netdev_get_tx_queue(dp->netdev, qidx); 247 netif_tx_stop_queue(nd_q); 248 nfp_net_tx_xmit_more_flush(tx_ring); 249 u64_stats_update_begin(&r_vec->tx_sync); 250 r_vec->tx_busy++; 251 u64_stats_update_end(&r_vec->tx_sync); 252 return NETDEV_TX_BUSY; 253 } 254 255 skb = nfp_net_tls_tx(dp, r_vec, skb, &tls_handle, &nr_frags); 256 if (unlikely(!skb)) { 257 nfp_net_tx_xmit_more_flush(tx_ring); 258 return NETDEV_TX_OK; 259 } 260 261 md_bytes = nfp_nfd3_prep_tx_meta(skb, tls_handle); 262 if (unlikely(md_bytes < 0)) 263 goto err_flush; 264 265 /* Start with the head skbuf */ 266 dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), 267 DMA_TO_DEVICE); 268 if (dma_mapping_error(dp->dev, dma_addr)) 269 goto err_dma_err; 270 271 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 272 273 /* Stash the soft descriptor of the head then initialize it */ 274 txbuf = &tx_ring->txbufs[wr_idx]; 275 txbuf->skb = skb; 276 txbuf->dma_addr = dma_addr; 277 txbuf->fidx = -1; 278 txbuf->pkt_cnt = 1; 279 txbuf->real_len = skb->len; 280 281 /* Build TX descriptor */ 282 txd = &tx_ring->txds[wr_idx]; 283 txd->offset_eop = (nr_frags ? 0 : NFD3_DESC_TX_EOP) | md_bytes; 284 txd->dma_len = cpu_to_le16(skb_headlen(skb)); 285 nfp_desc_set_dma_addr(txd, dma_addr); 286 txd->data_len = cpu_to_le16(skb->len); 287 288 txd->flags = 0; 289 txd->mss = 0; 290 txd->lso_hdrlen = 0; 291 292 /* Do not reorder - tso may adjust pkt cnt, vlan may override fields */ 293 nfp_nfd3_tx_tso(r_vec, txbuf, txd, skb, md_bytes); 294 nfp_nfd3_tx_csum(dp, r_vec, txbuf, txd, skb); 295 if (skb_vlan_tag_present(skb) && dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN) { 296 txd->flags |= NFD3_DESC_TX_VLAN; 297 txd->vlan = cpu_to_le16(skb_vlan_tag_get(skb)); 298 } 299 300 /* Gather DMA */ 301 if (nr_frags > 0) { 302 __le64 second_half; 303 304 /* all descs must match except for in addr, length and eop */ 305 second_half = txd->vals8[1]; 306 307 for (f = 0; f < nr_frags; f++) { 308 frag = &skb_shinfo(skb)->frags[f]; 309 fsize = skb_frag_size(frag); 310 311 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, 312 fsize, DMA_TO_DEVICE); 313 if (dma_mapping_error(dp->dev, dma_addr)) 314 goto err_unmap; 315 316 wr_idx = D_IDX(tx_ring, wr_idx + 1); 317 tx_ring->txbufs[wr_idx].skb = skb; 318 tx_ring->txbufs[wr_idx].dma_addr = dma_addr; 319 tx_ring->txbufs[wr_idx].fidx = f; 320 321 txd = &tx_ring->txds[wr_idx]; 322 txd->dma_len = cpu_to_le16(fsize); 323 nfp_desc_set_dma_addr(txd, dma_addr); 324 txd->offset_eop = md_bytes | 325 ((f == nr_frags - 1) ? NFD3_DESC_TX_EOP : 0); 326 txd->vals8[1] = second_half; 327 } 328 329 u64_stats_update_begin(&r_vec->tx_sync); 330 r_vec->tx_gather++; 331 u64_stats_update_end(&r_vec->tx_sync); 332 } 333 334 skb_tx_timestamp(skb); 335 336 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); 337 338 tx_ring->wr_p += nr_frags + 1; 339 if (nfp_nfd3_tx_ring_should_stop(tx_ring)) 340 nfp_nfd3_tx_ring_stop(nd_q, tx_ring); 341 342 tx_ring->wr_ptr_add += nr_frags + 1; 343 if (__netdev_tx_sent_queue(nd_q, txbuf->real_len, netdev_xmit_more())) 344 nfp_net_tx_xmit_more_flush(tx_ring); 345 346 return NETDEV_TX_OK; 347 348 err_unmap: 349 while (--f >= 0) { 350 frag = &skb_shinfo(skb)->frags[f]; 351 dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, 352 skb_frag_size(frag), DMA_TO_DEVICE); 353 tx_ring->txbufs[wr_idx].skb = NULL; 354 tx_ring->txbufs[wr_idx].dma_addr = 0; 355 tx_ring->txbufs[wr_idx].fidx = -2; 356 wr_idx = wr_idx - 1; 357 if (wr_idx < 0) 358 wr_idx += tx_ring->cnt; 359 } 360 dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, 361 skb_headlen(skb), DMA_TO_DEVICE); 362 tx_ring->txbufs[wr_idx].skb = NULL; 363 tx_ring->txbufs[wr_idx].dma_addr = 0; 364 tx_ring->txbufs[wr_idx].fidx = -2; 365 err_dma_err: 366 nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); 367 err_flush: 368 nfp_net_tx_xmit_more_flush(tx_ring); 369 u64_stats_update_begin(&r_vec->tx_sync); 370 r_vec->tx_errors++; 371 u64_stats_update_end(&r_vec->tx_sync); 372 nfp_net_tls_tx_undo(skb, tls_handle); 373 dev_kfree_skb_any(skb); 374 return NETDEV_TX_OK; 375 } 376 377 /** 378 * nfp_nfd3_tx_complete() - Handled completed TX packets 379 * @tx_ring: TX ring structure 380 * @budget: NAPI budget (only used as bool to determine if in NAPI context) 381 */ 382 void nfp_nfd3_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 383 { 384 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 385 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 386 u32 done_pkts = 0, done_bytes = 0; 387 struct netdev_queue *nd_q; 388 u32 qcp_rd_p; 389 int todo; 390 391 if (tx_ring->wr_p == tx_ring->rd_p) 392 return; 393 394 /* Work out how many descriptors have been transmitted */ 395 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 396 397 if (qcp_rd_p == tx_ring->qcp_rd_p) 398 return; 399 400 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 401 402 while (todo--) { 403 const skb_frag_t *frag; 404 struct nfp_nfd3_tx_buf *tx_buf; 405 struct sk_buff *skb; 406 int fidx, nr_frags; 407 int idx; 408 409 idx = D_IDX(tx_ring, tx_ring->rd_p++); 410 tx_buf = &tx_ring->txbufs[idx]; 411 412 skb = tx_buf->skb; 413 if (!skb) 414 continue; 415 416 nr_frags = skb_shinfo(skb)->nr_frags; 417 fidx = tx_buf->fidx; 418 419 if (fidx == -1) { 420 /* unmap head */ 421 dma_unmap_single(dp->dev, tx_buf->dma_addr, 422 skb_headlen(skb), DMA_TO_DEVICE); 423 424 done_pkts += tx_buf->pkt_cnt; 425 done_bytes += tx_buf->real_len; 426 } else { 427 /* unmap fragment */ 428 frag = &skb_shinfo(skb)->frags[fidx]; 429 dma_unmap_page(dp->dev, tx_buf->dma_addr, 430 skb_frag_size(frag), DMA_TO_DEVICE); 431 } 432 433 /* check for last gather fragment */ 434 if (fidx == nr_frags - 1) 435 napi_consume_skb(skb, budget); 436 437 tx_buf->dma_addr = 0; 438 tx_buf->skb = NULL; 439 tx_buf->fidx = -2; 440 } 441 442 tx_ring->qcp_rd_p = qcp_rd_p; 443 444 u64_stats_update_begin(&r_vec->tx_sync); 445 r_vec->tx_bytes += done_bytes; 446 r_vec->tx_pkts += done_pkts; 447 u64_stats_update_end(&r_vec->tx_sync); 448 449 if (!dp->netdev) 450 return; 451 452 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); 453 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); 454 if (nfp_nfd3_tx_ring_should_wake(tx_ring)) { 455 /* Make sure TX thread will see updated tx_ring->rd_p */ 456 smp_mb(); 457 458 if (unlikely(netif_tx_queue_stopped(nd_q))) 459 netif_tx_wake_queue(nd_q); 460 } 461 462 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 463 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 464 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 465 } 466 467 static bool nfp_nfd3_xdp_complete(struct nfp_net_tx_ring *tx_ring) 468 { 469 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 470 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 471 u32 done_pkts = 0, done_bytes = 0; 472 bool done_all; 473 int idx, todo; 474 u32 qcp_rd_p; 475 476 /* Work out how many descriptors have been transmitted */ 477 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 478 479 if (qcp_rd_p == tx_ring->qcp_rd_p) 480 return true; 481 482 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 483 484 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; 485 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); 486 487 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + todo); 488 489 done_pkts = todo; 490 while (todo--) { 491 idx = D_IDX(tx_ring, tx_ring->rd_p); 492 tx_ring->rd_p++; 493 494 done_bytes += tx_ring->txbufs[idx].real_len; 495 } 496 497 u64_stats_update_begin(&r_vec->tx_sync); 498 r_vec->tx_bytes += done_bytes; 499 r_vec->tx_pkts += done_pkts; 500 u64_stats_update_end(&r_vec->tx_sync); 501 502 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 503 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 504 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 505 506 return done_all; 507 } 508 509 /* Receive processing 510 */ 511 512 static void * 513 nfp_nfd3_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) 514 { 515 void *frag; 516 517 if (!dp->xdp_prog) { 518 frag = napi_alloc_frag(dp->fl_bufsz); 519 if (unlikely(!frag)) 520 return NULL; 521 } else { 522 struct page *page; 523 524 page = dev_alloc_page(); 525 if (unlikely(!page)) 526 return NULL; 527 frag = page_address(page); 528 } 529 530 *dma_addr = nfp_net_dma_map_rx(dp, frag); 531 if (dma_mapping_error(dp->dev, *dma_addr)) { 532 nfp_net_free_frag(frag, dp->xdp_prog); 533 nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); 534 return NULL; 535 } 536 537 return frag; 538 } 539 540 /** 541 * nfp_nfd3_rx_give_one() - Put mapped skb on the software and hardware rings 542 * @dp: NFP Net data path struct 543 * @rx_ring: RX ring structure 544 * @frag: page fragment buffer 545 * @dma_addr: DMA address of skb mapping 546 */ 547 static void 548 nfp_nfd3_rx_give_one(const struct nfp_net_dp *dp, 549 struct nfp_net_rx_ring *rx_ring, 550 void *frag, dma_addr_t dma_addr) 551 { 552 unsigned int wr_idx; 553 554 wr_idx = D_IDX(rx_ring, rx_ring->wr_p); 555 556 nfp_net_dma_sync_dev_rx(dp, dma_addr); 557 558 /* Stash SKB and DMA address away */ 559 rx_ring->rxbufs[wr_idx].frag = frag; 560 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; 561 562 /* Fill freelist descriptor */ 563 rx_ring->rxds[wr_idx].fld.reserved = 0; 564 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; 565 nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld, 566 dma_addr + dp->rx_dma_off); 567 568 rx_ring->wr_p++; 569 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { 570 /* Update write pointer of the freelist queue. Make 571 * sure all writes are flushed before telling the hardware. 572 */ 573 wmb(); 574 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); 575 } 576 } 577 578 /** 579 * nfp_nfd3_rx_ring_fill_freelist() - Give buffers from the ring to FW 580 * @dp: NFP Net data path struct 581 * @rx_ring: RX ring to fill 582 */ 583 void nfp_nfd3_rx_ring_fill_freelist(struct nfp_net_dp *dp, 584 struct nfp_net_rx_ring *rx_ring) 585 { 586 unsigned int i; 587 588 if (nfp_net_has_xsk_pool_slow(dp, rx_ring->idx)) 589 return nfp_net_xsk_rx_ring_fill_freelist(rx_ring); 590 591 for (i = 0; i < rx_ring->cnt - 1; i++) 592 nfp_nfd3_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, 593 rx_ring->rxbufs[i].dma_addr); 594 } 595 596 /** 597 * nfp_nfd3_rx_csum_has_errors() - group check if rxd has any csum errors 598 * @flags: RX descriptor flags field in CPU byte order 599 */ 600 static int nfp_nfd3_rx_csum_has_errors(u16 flags) 601 { 602 u16 csum_all_checked, csum_all_ok; 603 604 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; 605 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; 606 607 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); 608 } 609 610 /** 611 * nfp_nfd3_rx_csum() - set SKB checksum field based on RX descriptor flags 612 * @dp: NFP Net data path struct 613 * @r_vec: per-ring structure 614 * @rxd: Pointer to RX descriptor 615 * @meta: Parsed metadata prepend 616 * @skb: Pointer to SKB 617 */ 618 void 619 nfp_nfd3_rx_csum(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 620 const struct nfp_net_rx_desc *rxd, 621 const struct nfp_meta_parsed *meta, struct sk_buff *skb) 622 { 623 skb_checksum_none_assert(skb); 624 625 if (!(dp->netdev->features & NETIF_F_RXCSUM)) 626 return; 627 628 if (meta->csum_type) { 629 skb->ip_summed = meta->csum_type; 630 skb->csum = meta->csum; 631 u64_stats_update_begin(&r_vec->rx_sync); 632 r_vec->hw_csum_rx_complete++; 633 u64_stats_update_end(&r_vec->rx_sync); 634 return; 635 } 636 637 if (nfp_nfd3_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { 638 u64_stats_update_begin(&r_vec->rx_sync); 639 r_vec->hw_csum_rx_error++; 640 u64_stats_update_end(&r_vec->rx_sync); 641 return; 642 } 643 644 /* Assume that the firmware will never report inner CSUM_OK unless outer 645 * L4 headers were successfully parsed. FW will always report zero UDP 646 * checksum as CSUM_OK. 647 */ 648 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || 649 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { 650 __skb_incr_checksum_unnecessary(skb); 651 u64_stats_update_begin(&r_vec->rx_sync); 652 r_vec->hw_csum_rx_ok++; 653 u64_stats_update_end(&r_vec->rx_sync); 654 } 655 656 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || 657 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { 658 __skb_incr_checksum_unnecessary(skb); 659 u64_stats_update_begin(&r_vec->rx_sync); 660 r_vec->hw_csum_rx_inner_ok++; 661 u64_stats_update_end(&r_vec->rx_sync); 662 } 663 } 664 665 static void 666 nfp_nfd3_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, 667 unsigned int type, __be32 *hash) 668 { 669 if (!(netdev->features & NETIF_F_RXHASH)) 670 return; 671 672 switch (type) { 673 case NFP_NET_RSS_IPV4: 674 case NFP_NET_RSS_IPV6: 675 case NFP_NET_RSS_IPV6_EX: 676 meta->hash_type = PKT_HASH_TYPE_L3; 677 break; 678 default: 679 meta->hash_type = PKT_HASH_TYPE_L4; 680 break; 681 } 682 683 meta->hash = get_unaligned_be32(hash); 684 } 685 686 static void 687 nfp_nfd3_set_hash_desc(struct net_device *netdev, struct nfp_meta_parsed *meta, 688 void *data, struct nfp_net_rx_desc *rxd) 689 { 690 struct nfp_net_rx_hash *rx_hash = data; 691 692 if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS)) 693 return; 694 695 nfp_nfd3_set_hash(netdev, meta, get_unaligned_be32(&rx_hash->hash_type), 696 &rx_hash->hash); 697 } 698 699 bool 700 nfp_nfd3_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, 701 void *data, void *pkt, unsigned int pkt_len, int meta_len) 702 { 703 u32 meta_info; 704 705 meta_info = get_unaligned_be32(data); 706 data += 4; 707 708 while (meta_info) { 709 switch (meta_info & NFP_NET_META_FIELD_MASK) { 710 case NFP_NET_META_HASH: 711 meta_info >>= NFP_NET_META_FIELD_SIZE; 712 nfp_nfd3_set_hash(netdev, meta, 713 meta_info & NFP_NET_META_FIELD_MASK, 714 (__be32 *)data); 715 data += 4; 716 break; 717 case NFP_NET_META_MARK: 718 meta->mark = get_unaligned_be32(data); 719 data += 4; 720 break; 721 case NFP_NET_META_PORTID: 722 meta->portid = get_unaligned_be32(data); 723 data += 4; 724 break; 725 case NFP_NET_META_CSUM: 726 meta->csum_type = CHECKSUM_COMPLETE; 727 meta->csum = 728 (__force __wsum)__get_unaligned_cpu32(data); 729 data += 4; 730 break; 731 case NFP_NET_META_RESYNC_INFO: 732 if (nfp_net_tls_rx_resync_req(netdev, data, pkt, 733 pkt_len)) 734 return false; 735 data += sizeof(struct nfp_net_tls_resync_req); 736 break; 737 default: 738 return true; 739 } 740 741 meta_info >>= NFP_NET_META_FIELD_SIZE; 742 } 743 744 return data != pkt; 745 } 746 747 static void 748 nfp_nfd3_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 749 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, 750 struct sk_buff *skb) 751 { 752 u64_stats_update_begin(&r_vec->rx_sync); 753 r_vec->rx_drops++; 754 /* If we have both skb and rxbuf the replacement buffer allocation 755 * must have failed, count this as an alloc failure. 756 */ 757 if (skb && rxbuf) 758 r_vec->rx_replace_buf_alloc_fail++; 759 u64_stats_update_end(&r_vec->rx_sync); 760 761 /* skb is build based on the frag, free_skb() would free the frag 762 * so to be able to reuse it we need an extra ref. 763 */ 764 if (skb && rxbuf && skb->head == rxbuf->frag) 765 page_ref_inc(virt_to_head_page(rxbuf->frag)); 766 if (rxbuf) 767 nfp_nfd3_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); 768 if (skb) 769 dev_kfree_skb_any(skb); 770 } 771 772 static bool 773 nfp_nfd3_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, 774 struct nfp_net_tx_ring *tx_ring, 775 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, 776 unsigned int pkt_len, bool *completed) 777 { 778 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; 779 struct nfp_nfd3_tx_buf *txbuf; 780 struct nfp_nfd3_tx_desc *txd; 781 int wr_idx; 782 783 /* Reject if xdp_adjust_tail grow packet beyond DMA area */ 784 if (pkt_len + dma_off > dma_map_sz) 785 return false; 786 787 if (unlikely(nfp_net_tx_full(tx_ring, 1))) { 788 if (!*completed) { 789 nfp_nfd3_xdp_complete(tx_ring); 790 *completed = true; 791 } 792 793 if (unlikely(nfp_net_tx_full(tx_ring, 1))) { 794 nfp_nfd3_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, 795 NULL); 796 return false; 797 } 798 } 799 800 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 801 802 /* Stash the soft descriptor of the head then initialize it */ 803 txbuf = &tx_ring->txbufs[wr_idx]; 804 805 nfp_nfd3_rx_give_one(dp, rx_ring, txbuf->frag, txbuf->dma_addr); 806 807 txbuf->frag = rxbuf->frag; 808 txbuf->dma_addr = rxbuf->dma_addr; 809 txbuf->fidx = -1; 810 txbuf->pkt_cnt = 1; 811 txbuf->real_len = pkt_len; 812 813 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, 814 pkt_len, DMA_BIDIRECTIONAL); 815 816 /* Build TX descriptor */ 817 txd = &tx_ring->txds[wr_idx]; 818 txd->offset_eop = NFD3_DESC_TX_EOP; 819 txd->dma_len = cpu_to_le16(pkt_len); 820 nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off); 821 txd->data_len = cpu_to_le16(pkt_len); 822 823 txd->flags = 0; 824 txd->mss = 0; 825 txd->lso_hdrlen = 0; 826 827 tx_ring->wr_p++; 828 tx_ring->wr_ptr_add++; 829 return true; 830 } 831 832 /** 833 * nfp_nfd3_rx() - receive up to @budget packets on @rx_ring 834 * @rx_ring: RX ring to receive from 835 * @budget: NAPI budget 836 * 837 * Note, this function is separated out from the napi poll function to 838 * more cleanly separate packet receive code from other bookkeeping 839 * functions performed in the napi poll function. 840 * 841 * Return: Number of packets received. 842 */ 843 static int nfp_nfd3_rx(struct nfp_net_rx_ring *rx_ring, int budget) 844 { 845 struct nfp_net_r_vector *r_vec = rx_ring->r_vec; 846 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 847 struct nfp_net_tx_ring *tx_ring; 848 struct bpf_prog *xdp_prog; 849 bool xdp_tx_cmpl = false; 850 unsigned int true_bufsz; 851 struct sk_buff *skb; 852 int pkts_polled = 0; 853 struct xdp_buff xdp; 854 int idx; 855 856 xdp_prog = READ_ONCE(dp->xdp_prog); 857 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; 858 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, 859 &rx_ring->xdp_rxq); 860 tx_ring = r_vec->xdp_ring; 861 862 while (pkts_polled < budget) { 863 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 864 struct nfp_net_rx_buf *rxbuf; 865 struct nfp_net_rx_desc *rxd; 866 struct nfp_meta_parsed meta; 867 bool redir_egress = false; 868 struct net_device *netdev; 869 dma_addr_t new_dma_addr; 870 u32 meta_len_xdp = 0; 871 void *new_frag; 872 873 idx = D_IDX(rx_ring, rx_ring->rd_p); 874 875 rxd = &rx_ring->rxds[idx]; 876 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 877 break; 878 879 /* Memory barrier to ensure that we won't do other reads 880 * before the DD bit. 881 */ 882 dma_rmb(); 883 884 memset(&meta, 0, sizeof(meta)); 885 886 rx_ring->rd_p++; 887 pkts_polled++; 888 889 rxbuf = &rx_ring->rxbufs[idx]; 890 /* < meta_len > 891 * <-- [rx_offset] --> 892 * --------------------------------------------------------- 893 * | [XX] | metadata | packet | XXXX | 894 * --------------------------------------------------------- 895 * <---------------- data_len ---------------> 896 * 897 * The rx_offset is fixed for all packets, the meta_len can vary 898 * on a packet by packet basis. If rx_offset is set to zero 899 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the 900 * buffer and is immediately followed by the packet (no [XX]). 901 */ 902 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 903 data_len = le16_to_cpu(rxd->rxd.data_len); 904 pkt_len = data_len - meta_len; 905 906 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 907 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 908 pkt_off += meta_len; 909 else 910 pkt_off += dp->rx_offset; 911 meta_off = pkt_off - meta_len; 912 913 /* Stats update */ 914 u64_stats_update_begin(&r_vec->rx_sync); 915 r_vec->rx_pkts++; 916 r_vec->rx_bytes += pkt_len; 917 u64_stats_update_end(&r_vec->rx_sync); 918 919 if (unlikely(meta_len > NFP_NET_MAX_PREPEND || 920 (dp->rx_offset && meta_len > dp->rx_offset))) { 921 nn_dp_warn(dp, "oversized RX packet metadata %u\n", 922 meta_len); 923 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 924 continue; 925 } 926 927 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, 928 data_len); 929 930 if (!dp->chained_metadata_format) { 931 nfp_nfd3_set_hash_desc(dp->netdev, &meta, 932 rxbuf->frag + meta_off, rxd); 933 } else if (meta_len) { 934 if (unlikely(nfp_nfd3_parse_meta(dp->netdev, &meta, 935 rxbuf->frag + meta_off, 936 rxbuf->frag + pkt_off, 937 pkt_len, meta_len))) { 938 nn_dp_warn(dp, "invalid RX packet metadata\n"); 939 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, 940 NULL); 941 continue; 942 } 943 } 944 945 if (xdp_prog && !meta.portid) { 946 void *orig_data = rxbuf->frag + pkt_off; 947 unsigned int dma_off; 948 int act; 949 950 xdp_prepare_buff(&xdp, 951 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, 952 pkt_off - NFP_NET_RX_BUF_HEADROOM, 953 pkt_len, true); 954 955 act = bpf_prog_run_xdp(xdp_prog, &xdp); 956 957 pkt_len = xdp.data_end - xdp.data; 958 pkt_off += xdp.data - orig_data; 959 960 switch (act) { 961 case XDP_PASS: 962 meta_len_xdp = xdp.data - xdp.data_meta; 963 break; 964 case XDP_TX: 965 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; 966 if (unlikely(!nfp_nfd3_tx_xdp_buf(dp, rx_ring, 967 tx_ring, 968 rxbuf, 969 dma_off, 970 pkt_len, 971 &xdp_tx_cmpl))) 972 trace_xdp_exception(dp->netdev, 973 xdp_prog, act); 974 continue; 975 default: 976 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act); 977 fallthrough; 978 case XDP_ABORTED: 979 trace_xdp_exception(dp->netdev, xdp_prog, act); 980 fallthrough; 981 case XDP_DROP: 982 nfp_nfd3_rx_give_one(dp, rx_ring, rxbuf->frag, 983 rxbuf->dma_addr); 984 continue; 985 } 986 } 987 988 if (likely(!meta.portid)) { 989 netdev = dp->netdev; 990 } else if (meta.portid == NFP_META_PORT_ID_CTRL) { 991 struct nfp_net *nn = netdev_priv(dp->netdev); 992 993 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, 994 pkt_len); 995 nfp_nfd3_rx_give_one(dp, rx_ring, rxbuf->frag, 996 rxbuf->dma_addr); 997 continue; 998 } else { 999 struct nfp_net *nn; 1000 1001 nn = netdev_priv(dp->netdev); 1002 netdev = nfp_app_dev_get(nn->app, meta.portid, 1003 &redir_egress); 1004 if (unlikely(!netdev)) { 1005 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, 1006 NULL); 1007 continue; 1008 } 1009 1010 if (nfp_netdev_is_nfp_repr(netdev)) 1011 nfp_repr_inc_rx_stats(netdev, pkt_len); 1012 } 1013 1014 skb = build_skb(rxbuf->frag, true_bufsz); 1015 if (unlikely(!skb)) { 1016 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1017 continue; 1018 } 1019 new_frag = nfp_nfd3_napi_alloc_one(dp, &new_dma_addr); 1020 if (unlikely(!new_frag)) { 1021 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1022 continue; 1023 } 1024 1025 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1026 1027 nfp_nfd3_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1028 1029 skb_reserve(skb, pkt_off); 1030 skb_put(skb, pkt_len); 1031 1032 skb->mark = meta.mark; 1033 skb_set_hash(skb, meta.hash, meta.hash_type); 1034 1035 skb_record_rx_queue(skb, rx_ring->idx); 1036 skb->protocol = eth_type_trans(skb, netdev); 1037 1038 nfp_nfd3_rx_csum(dp, r_vec, rxd, &meta, skb); 1039 1040 #ifdef CONFIG_TLS_DEVICE 1041 if (rxd->rxd.flags & PCIE_DESC_RX_DECRYPTED) { 1042 skb->decrypted = true; 1043 u64_stats_update_begin(&r_vec->rx_sync); 1044 r_vec->hw_tls_rx++; 1045 u64_stats_update_end(&r_vec->rx_sync); 1046 } 1047 #endif 1048 1049 if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) 1050 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1051 le16_to_cpu(rxd->rxd.vlan)); 1052 if (meta_len_xdp) 1053 skb_metadata_set(skb, meta_len_xdp); 1054 1055 if (likely(!redir_egress)) { 1056 napi_gro_receive(&rx_ring->r_vec->napi, skb); 1057 } else { 1058 skb->dev = netdev; 1059 skb_reset_network_header(skb); 1060 __skb_push(skb, ETH_HLEN); 1061 dev_queue_xmit(skb); 1062 } 1063 } 1064 1065 if (xdp_prog) { 1066 if (tx_ring->wr_ptr_add) 1067 nfp_net_tx_xmit_more_flush(tx_ring); 1068 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && 1069 !xdp_tx_cmpl) 1070 if (!nfp_nfd3_xdp_complete(tx_ring)) 1071 pkts_polled = budget; 1072 } 1073 1074 return pkts_polled; 1075 } 1076 1077 /** 1078 * nfp_nfd3_poll() - napi poll function 1079 * @napi: NAPI structure 1080 * @budget: NAPI budget 1081 * 1082 * Return: number of packets polled. 1083 */ 1084 int nfp_nfd3_poll(struct napi_struct *napi, int budget) 1085 { 1086 struct nfp_net_r_vector *r_vec = 1087 container_of(napi, struct nfp_net_r_vector, napi); 1088 unsigned int pkts_polled = 0; 1089 1090 if (r_vec->tx_ring) 1091 nfp_nfd3_tx_complete(r_vec->tx_ring, budget); 1092 if (r_vec->rx_ring) 1093 pkts_polled = nfp_nfd3_rx(r_vec->rx_ring, budget); 1094 1095 if (pkts_polled < budget) 1096 if (napi_complete_done(napi, pkts_polled)) 1097 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1098 1099 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) { 1100 struct dim_sample dim_sample = {}; 1101 unsigned int start; 1102 u64 pkts, bytes; 1103 1104 do { 1105 start = u64_stats_fetch_begin(&r_vec->rx_sync); 1106 pkts = r_vec->rx_pkts; 1107 bytes = r_vec->rx_bytes; 1108 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); 1109 1110 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1111 net_dim(&r_vec->rx_dim, dim_sample); 1112 } 1113 1114 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) { 1115 struct dim_sample dim_sample = {}; 1116 unsigned int start; 1117 u64 pkts, bytes; 1118 1119 do { 1120 start = u64_stats_fetch_begin(&r_vec->tx_sync); 1121 pkts = r_vec->tx_pkts; 1122 bytes = r_vec->tx_bytes; 1123 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); 1124 1125 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1126 net_dim(&r_vec->tx_dim, dim_sample); 1127 } 1128 1129 return pkts_polled; 1130 } 1131 1132 /* Control device data path 1133 */ 1134 1135 bool 1136 nfp_nfd3_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, 1137 struct sk_buff *skb, bool old) 1138 { 1139 unsigned int real_len = skb->len, meta_len = 0; 1140 struct nfp_net_tx_ring *tx_ring; 1141 struct nfp_nfd3_tx_buf *txbuf; 1142 struct nfp_nfd3_tx_desc *txd; 1143 struct nfp_net_dp *dp; 1144 dma_addr_t dma_addr; 1145 int wr_idx; 1146 1147 dp = &r_vec->nfp_net->dp; 1148 tx_ring = r_vec->tx_ring; 1149 1150 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { 1151 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); 1152 goto err_free; 1153 } 1154 1155 if (unlikely(nfp_net_tx_full(tx_ring, 1))) { 1156 u64_stats_update_begin(&r_vec->tx_sync); 1157 r_vec->tx_busy++; 1158 u64_stats_update_end(&r_vec->tx_sync); 1159 if (!old) 1160 __skb_queue_tail(&r_vec->queue, skb); 1161 else 1162 __skb_queue_head(&r_vec->queue, skb); 1163 return true; 1164 } 1165 1166 if (nfp_app_ctrl_has_meta(nn->app)) { 1167 if (unlikely(skb_headroom(skb) < 8)) { 1168 nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); 1169 goto err_free; 1170 } 1171 meta_len = 8; 1172 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); 1173 put_unaligned_be32(NFP_NET_META_PORTID, skb_push(skb, 4)); 1174 } 1175 1176 /* Start with the head skbuf */ 1177 dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), 1178 DMA_TO_DEVICE); 1179 if (dma_mapping_error(dp->dev, dma_addr)) 1180 goto err_dma_warn; 1181 1182 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 1183 1184 /* Stash the soft descriptor of the head then initialize it */ 1185 txbuf = &tx_ring->txbufs[wr_idx]; 1186 txbuf->skb = skb; 1187 txbuf->dma_addr = dma_addr; 1188 txbuf->fidx = -1; 1189 txbuf->pkt_cnt = 1; 1190 txbuf->real_len = real_len; 1191 1192 /* Build TX descriptor */ 1193 txd = &tx_ring->txds[wr_idx]; 1194 txd->offset_eop = meta_len | NFD3_DESC_TX_EOP; 1195 txd->dma_len = cpu_to_le16(skb_headlen(skb)); 1196 nfp_desc_set_dma_addr(txd, dma_addr); 1197 txd->data_len = cpu_to_le16(skb->len); 1198 1199 txd->flags = 0; 1200 txd->mss = 0; 1201 txd->lso_hdrlen = 0; 1202 1203 tx_ring->wr_p++; 1204 tx_ring->wr_ptr_add++; 1205 nfp_net_tx_xmit_more_flush(tx_ring); 1206 1207 return false; 1208 1209 err_dma_warn: 1210 nn_dp_warn(dp, "Failed to DMA map TX CTRL buffer\n"); 1211 err_free: 1212 u64_stats_update_begin(&r_vec->tx_sync); 1213 r_vec->tx_errors++; 1214 u64_stats_update_end(&r_vec->tx_sync); 1215 dev_kfree_skb_any(skb); 1216 return false; 1217 } 1218 1219 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) 1220 { 1221 struct sk_buff *skb; 1222 1223 while ((skb = __skb_dequeue(&r_vec->queue))) 1224 if (nfp_nfd3_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) 1225 return; 1226 } 1227 1228 static bool 1229 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) 1230 { 1231 u32 meta_type, meta_tag; 1232 1233 if (!nfp_app_ctrl_has_meta(nn->app)) 1234 return !meta_len; 1235 1236 if (meta_len != 8) 1237 return false; 1238 1239 meta_type = get_unaligned_be32(data); 1240 meta_tag = get_unaligned_be32(data + 4); 1241 1242 return (meta_type == NFP_NET_META_PORTID && 1243 meta_tag == NFP_META_PORT_ID_CTRL); 1244 } 1245 1246 static bool 1247 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, 1248 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) 1249 { 1250 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 1251 struct nfp_net_rx_buf *rxbuf; 1252 struct nfp_net_rx_desc *rxd; 1253 dma_addr_t new_dma_addr; 1254 struct sk_buff *skb; 1255 void *new_frag; 1256 int idx; 1257 1258 idx = D_IDX(rx_ring, rx_ring->rd_p); 1259 1260 rxd = &rx_ring->rxds[idx]; 1261 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 1262 return false; 1263 1264 /* Memory barrier to ensure that we won't do other reads 1265 * before the DD bit. 1266 */ 1267 dma_rmb(); 1268 1269 rx_ring->rd_p++; 1270 1271 rxbuf = &rx_ring->rxbufs[idx]; 1272 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 1273 data_len = le16_to_cpu(rxd->rxd.data_len); 1274 pkt_len = data_len - meta_len; 1275 1276 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 1277 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 1278 pkt_off += meta_len; 1279 else 1280 pkt_off += dp->rx_offset; 1281 meta_off = pkt_off - meta_len; 1282 1283 /* Stats update */ 1284 u64_stats_update_begin(&r_vec->rx_sync); 1285 r_vec->rx_pkts++; 1286 r_vec->rx_bytes += pkt_len; 1287 u64_stats_update_end(&r_vec->rx_sync); 1288 1289 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); 1290 1291 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { 1292 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", 1293 meta_len); 1294 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1295 return true; 1296 } 1297 1298 skb = build_skb(rxbuf->frag, dp->fl_bufsz); 1299 if (unlikely(!skb)) { 1300 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1301 return true; 1302 } 1303 new_frag = nfp_nfd3_napi_alloc_one(dp, &new_dma_addr); 1304 if (unlikely(!new_frag)) { 1305 nfp_nfd3_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1306 return true; 1307 } 1308 1309 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1310 1311 nfp_nfd3_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1312 1313 skb_reserve(skb, pkt_off); 1314 skb_put(skb, pkt_len); 1315 1316 nfp_app_ctrl_rx(nn->app, skb); 1317 1318 return true; 1319 } 1320 1321 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) 1322 { 1323 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; 1324 struct nfp_net *nn = r_vec->nfp_net; 1325 struct nfp_net_dp *dp = &nn->dp; 1326 unsigned int budget = 512; 1327 1328 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) 1329 continue; 1330 1331 return budget; 1332 } 1333 1334 void nfp_nfd3_ctrl_poll(struct tasklet_struct *t) 1335 { 1336 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); 1337 1338 spin_lock(&r_vec->lock); 1339 nfp_nfd3_tx_complete(r_vec->tx_ring, 0); 1340 __nfp_ctrl_tx_queued(r_vec); 1341 spin_unlock(&r_vec->lock); 1342 1343 if (nfp_ctrl_rx(r_vec)) { 1344 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1345 } else { 1346 tasklet_schedule(&r_vec->tasklet); 1347 nn_dp_warn(&r_vec->nfp_net->dp, 1348 "control message budget exceeded!\n"); 1349 } 1350 } 1351