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 #include <linux/overflow.h> 7 #include <linux/sizes.h> 8 #include <linux/bitfield.h> 9 #include <net/xfrm.h> 10 11 #include "../nfp_app.h" 12 #include "../nfp_net.h" 13 #include "../nfp_net_dp.h" 14 #include "../crypto/crypto.h" 15 #include "../crypto/fw.h" 16 #include "nfdk.h" 17 18 static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) 19 { 20 return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2); 21 } 22 23 static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) 24 { 25 return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT); 26 } 27 28 static void nfp_nfdk_tx_ring_stop(struct netdev_queue *nd_q, 29 struct nfp_net_tx_ring *tx_ring) 30 { 31 netif_tx_stop_queue(nd_q); 32 33 /* We can race with the TX completion out of NAPI so recheck */ 34 smp_mb(); 35 if (unlikely(nfp_nfdk_tx_ring_should_wake(tx_ring))) 36 netif_tx_start_queue(nd_q); 37 } 38 39 static __le64 40 nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf, 41 struct sk_buff *skb) 42 { 43 u32 segs, hdrlen, l3_offset, l4_offset; 44 struct nfp_nfdk_tx_desc txd; 45 u16 mss; 46 47 if (!skb->encapsulation) { 48 l3_offset = skb_network_offset(skb); 49 l4_offset = skb_transport_offset(skb); 50 hdrlen = skb_tcp_all_headers(skb); 51 } else { 52 l3_offset = skb_inner_network_offset(skb); 53 l4_offset = skb_inner_transport_offset(skb); 54 hdrlen = skb_inner_tcp_all_headers(skb); 55 } 56 57 segs = skb_shinfo(skb)->gso_segs; 58 mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK; 59 60 txd.l3_offset = l3_offset; 61 txd.l4_offset = l4_offset; 62 txd.lso_meta_res = 0; 63 txd.mss = cpu_to_le16(mss); 64 txd.lso_hdrlen = hdrlen; 65 txd.lso_totsegs = segs; 66 67 txbuf->pkt_cnt = segs; 68 txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1); 69 70 u64_stats_update_begin(&r_vec->tx_sync); 71 r_vec->tx_lso++; 72 u64_stats_update_end(&r_vec->tx_sync); 73 74 return txd.raw; 75 } 76 77 static u8 78 nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 79 unsigned int pkt_cnt, struct sk_buff *skb, u64 flags) 80 { 81 struct ipv6hdr *ipv6h; 82 struct iphdr *iph; 83 84 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) 85 return flags; 86 87 if (skb->ip_summed != CHECKSUM_PARTIAL) 88 return flags; 89 90 flags |= NFDK_DESC_TX_L4_CSUM; 91 92 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); 93 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); 94 95 /* L3 checksum offloading flag is not required for ipv6 */ 96 if (iph->version == 4) { 97 flags |= NFDK_DESC_TX_L3_CSUM; 98 } else if (ipv6h->version != 6) { 99 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); 100 return flags; 101 } 102 103 u64_stats_update_begin(&r_vec->tx_sync); 104 if (!skb->encapsulation) { 105 r_vec->hw_csum_tx += pkt_cnt; 106 } else { 107 flags |= NFDK_DESC_TX_ENCAP; 108 r_vec->hw_csum_tx_inner += pkt_cnt; 109 } 110 u64_stats_update_end(&r_vec->tx_sync); 111 112 return flags; 113 } 114 115 static int 116 nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring, 117 struct sk_buff *skb) 118 { 119 unsigned int n_descs, wr_p, nop_slots; 120 const skb_frag_t *frag, *fend; 121 struct nfp_nfdk_tx_desc *txd; 122 unsigned int nr_frags; 123 unsigned int wr_idx; 124 int err; 125 126 recount_descs: 127 n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb)); 128 nr_frags = skb_shinfo(skb)->nr_frags; 129 frag = skb_shinfo(skb)->frags; 130 fend = frag + nr_frags; 131 for (; frag < fend; frag++) 132 n_descs += DIV_ROUND_UP(skb_frag_size(frag), 133 NFDK_TX_MAX_DATA_PER_DESC); 134 135 if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) { 136 if (skb_is_nonlinear(skb)) { 137 err = skb_linearize(skb); 138 if (err) 139 return err; 140 goto recount_descs; 141 } 142 return -EINVAL; 143 } 144 145 /* Under count by 1 (don't count meta) for the round down to work out */ 146 n_descs += !!skb_is_gso(skb); 147 148 if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != 149 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) 150 goto close_block; 151 152 if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK) 153 goto close_block; 154 155 return 0; 156 157 close_block: 158 wr_p = tx_ring->wr_p; 159 nop_slots = D_BLOCK_CPL(wr_p); 160 161 wr_idx = D_IDX(tx_ring, wr_p); 162 tx_ring->ktxbufs[wr_idx].skb = NULL; 163 txd = &tx_ring->ktxds[wr_idx]; 164 165 memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); 166 167 tx_ring->data_pending = 0; 168 tx_ring->wr_p += nop_slots; 169 tx_ring->wr_ptr_add += nop_slots; 170 171 return 0; 172 } 173 174 static int 175 nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app, 176 struct sk_buff *skb, bool *ipsec) 177 { 178 struct metadata_dst *md_dst = skb_metadata_dst(skb); 179 struct nfp_ipsec_offload offload_info; 180 unsigned char *data; 181 bool vlan_insert; 182 u32 meta_id = 0; 183 int md_bytes; 184 185 #ifdef CONFIG_NFP_NET_IPSEC 186 if (xfrm_offload(skb)) 187 *ipsec = nfp_net_ipsec_tx_prep(dp, skb, &offload_info); 188 #endif 189 190 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) 191 md_dst = NULL; 192 193 vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2); 194 195 if (!(md_dst || vlan_insert || *ipsec)) 196 return 0; 197 198 md_bytes = sizeof(meta_id) + 199 (!!md_dst ? NFP_NET_META_PORTID_SIZE : 0) + 200 (vlan_insert ? NFP_NET_META_VLAN_SIZE : 0) + 201 (*ipsec ? NFP_NET_META_IPSEC_FIELD_SIZE : 0); 202 203 if (unlikely(skb_cow_head(skb, md_bytes))) 204 return -ENOMEM; 205 206 data = skb_push(skb, md_bytes) + md_bytes; 207 if (md_dst) { 208 data -= NFP_NET_META_PORTID_SIZE; 209 put_unaligned_be32(md_dst->u.port_info.port_id, data); 210 meta_id = NFP_NET_META_PORTID; 211 } 212 if (vlan_insert) { 213 data -= NFP_NET_META_VLAN_SIZE; 214 /* data type of skb->vlan_proto is __be16 215 * so it fills metadata without calling put_unaligned_be16 216 */ 217 memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto)); 218 put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto)); 219 meta_id <<= NFP_NET_META_FIELD_SIZE; 220 meta_id |= NFP_NET_META_VLAN; 221 } 222 223 if (*ipsec) { 224 data -= NFP_NET_META_IPSEC_SIZE; 225 put_unaligned_be32(offload_info.seq_hi, data); 226 data -= NFP_NET_META_IPSEC_SIZE; 227 put_unaligned_be32(offload_info.seq_low, data); 228 data -= NFP_NET_META_IPSEC_SIZE; 229 put_unaligned_be32(offload_info.handle - 1, data); 230 meta_id <<= NFP_NET_META_IPSEC_FIELD_SIZE; 231 meta_id |= NFP_NET_META_IPSEC << 8 | NFP_NET_META_IPSEC << 4 | NFP_NET_META_IPSEC; 232 } 233 234 meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) | 235 FIELD_PREP(NFDK_META_FIELDS, meta_id); 236 237 data -= sizeof(meta_id); 238 put_unaligned_be32(meta_id, data); 239 240 return NFDK_DESC_TX_CHAIN_META; 241 } 242 243 /** 244 * nfp_nfdk_tx() - Main transmit entry point 245 * @skb: SKB to transmit 246 * @netdev: netdev structure 247 * 248 * Return: NETDEV_TX_OK on success. 249 */ 250 netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev) 251 { 252 struct nfp_net *nn = netdev_priv(netdev); 253 struct nfp_nfdk_tx_buf *txbuf, *etxbuf; 254 u32 cnt, tmp_dlen, dlen_type = 0; 255 struct nfp_net_tx_ring *tx_ring; 256 struct nfp_net_r_vector *r_vec; 257 const skb_frag_t *frag, *fend; 258 struct nfp_nfdk_tx_desc *txd; 259 unsigned int real_len, qidx; 260 unsigned int dma_len, type; 261 struct netdev_queue *nd_q; 262 struct nfp_net_dp *dp; 263 int nr_frags, wr_idx; 264 dma_addr_t dma_addr; 265 bool ipsec = false; 266 u64 metadata; 267 268 dp = &nn->dp; 269 qidx = skb_get_queue_mapping(skb); 270 tx_ring = &dp->tx_rings[qidx]; 271 r_vec = tx_ring->r_vec; 272 nd_q = netdev_get_tx_queue(dp->netdev, qidx); 273 274 /* Don't bother counting frags, assume the worst */ 275 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 276 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", 277 qidx, tx_ring->wr_p, tx_ring->rd_p); 278 netif_tx_stop_queue(nd_q); 279 nfp_net_tx_xmit_more_flush(tx_ring); 280 u64_stats_update_begin(&r_vec->tx_sync); 281 r_vec->tx_busy++; 282 u64_stats_update_end(&r_vec->tx_sync); 283 return NETDEV_TX_BUSY; 284 } 285 286 metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb, &ipsec); 287 if (unlikely((int)metadata < 0)) 288 goto err_flush; 289 290 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb)) 291 goto err_flush; 292 293 /* nr_frags will change after skb_linearize so we get nr_frags after 294 * nfp_nfdk_tx_maybe_close_block function 295 */ 296 nr_frags = skb_shinfo(skb)->nr_frags; 297 /* DMA map all */ 298 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 299 txd = &tx_ring->ktxds[wr_idx]; 300 txbuf = &tx_ring->ktxbufs[wr_idx]; 301 302 dma_len = skb_headlen(skb); 303 if (skb_is_gso(skb)) 304 type = NFDK_DESC_TX_TYPE_TSO; 305 else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD) 306 type = NFDK_DESC_TX_TYPE_SIMPLE; 307 else 308 type = NFDK_DESC_TX_TYPE_GATHER; 309 310 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); 311 if (dma_mapping_error(dp->dev, dma_addr)) 312 goto err_warn_dma; 313 314 txbuf->skb = skb; 315 txbuf++; 316 317 txbuf->dma_addr = dma_addr; 318 txbuf++; 319 320 /* FIELD_PREP() implicitly truncates to chunk */ 321 dma_len -= 1; 322 323 /* We will do our best to pass as much data as we can in descriptor 324 * and we need to make sure the first descriptor includes whole head 325 * since there is limitation in firmware side. Sometimes the value of 326 * dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than 327 * headlen. 328 */ 329 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, 330 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ? 331 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) | 332 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); 333 334 txd->dma_len_type = cpu_to_le16(dlen_type); 335 nfp_desc_set_dma_addr_48b(txd, dma_addr); 336 337 /* starts at bit 0 */ 338 BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1)); 339 340 /* Preserve the original dlen_type, this way below the EOP logic 341 * can use dlen_type. 342 */ 343 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; 344 dma_len -= tmp_dlen; 345 dma_addr += tmp_dlen + 1; 346 txd++; 347 348 /* The rest of the data (if any) will be in larger dma descritors 349 * and is handled with the fragment loop. 350 */ 351 frag = skb_shinfo(skb)->frags; 352 fend = frag + nr_frags; 353 354 while (true) { 355 while (dma_len > 0) { 356 dma_len -= 1; 357 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); 358 359 txd->dma_len_type = cpu_to_le16(dlen_type); 360 nfp_desc_set_dma_addr_48b(txd, dma_addr); 361 362 dma_len -= dlen_type; 363 dma_addr += dlen_type + 1; 364 txd++; 365 } 366 367 if (frag >= fend) 368 break; 369 370 dma_len = skb_frag_size(frag); 371 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len, 372 DMA_TO_DEVICE); 373 if (dma_mapping_error(dp->dev, dma_addr)) 374 goto err_unmap; 375 376 txbuf->dma_addr = dma_addr; 377 txbuf++; 378 379 frag++; 380 } 381 382 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); 383 384 if (ipsec) 385 metadata = nfp_nfdk_ipsec_tx(metadata, skb); 386 387 if (!skb_is_gso(skb)) { 388 real_len = skb->len; 389 /* Metadata desc */ 390 if (!ipsec) 391 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata); 392 txd->raw = cpu_to_le64(metadata); 393 txd++; 394 } else { 395 /* lso desc should be placed after metadata desc */ 396 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb); 397 real_len = txbuf->real_len; 398 /* Metadata desc */ 399 if (!ipsec) 400 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata); 401 txd->raw = cpu_to_le64(metadata); 402 txd += 2; 403 txbuf++; 404 } 405 406 cnt = txd - tx_ring->ktxds - wr_idx; 407 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != 408 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) 409 goto err_warn_overflow; 410 411 skb_tx_timestamp(skb); 412 413 tx_ring->wr_p += cnt; 414 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 415 tx_ring->data_pending += skb->len; 416 else 417 tx_ring->data_pending = 0; 418 419 if (nfp_nfdk_tx_ring_should_stop(tx_ring)) 420 nfp_nfdk_tx_ring_stop(nd_q, tx_ring); 421 422 tx_ring->wr_ptr_add += cnt; 423 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more())) 424 nfp_net_tx_xmit_more_flush(tx_ring); 425 426 return NETDEV_TX_OK; 427 428 err_warn_overflow: 429 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", 430 wr_idx, skb_headlen(skb), nr_frags, cnt); 431 if (skb_is_gso(skb)) 432 txbuf--; 433 err_unmap: 434 /* txbuf pointed to the next-to-use */ 435 etxbuf = txbuf; 436 /* first txbuf holds the skb */ 437 txbuf = &tx_ring->ktxbufs[wr_idx + 1]; 438 if (txbuf < etxbuf) { 439 dma_unmap_single(dp->dev, txbuf->dma_addr, 440 skb_headlen(skb), DMA_TO_DEVICE); 441 txbuf->raw = 0; 442 txbuf++; 443 } 444 frag = skb_shinfo(skb)->frags; 445 while (etxbuf < txbuf) { 446 dma_unmap_page(dp->dev, txbuf->dma_addr, 447 skb_frag_size(frag), DMA_TO_DEVICE); 448 txbuf->raw = 0; 449 frag++; 450 txbuf++; 451 } 452 err_warn_dma: 453 nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); 454 err_flush: 455 nfp_net_tx_xmit_more_flush(tx_ring); 456 u64_stats_update_begin(&r_vec->tx_sync); 457 r_vec->tx_errors++; 458 u64_stats_update_end(&r_vec->tx_sync); 459 dev_kfree_skb_any(skb); 460 return NETDEV_TX_OK; 461 } 462 463 /** 464 * nfp_nfdk_tx_complete() - Handled completed TX packets 465 * @tx_ring: TX ring structure 466 * @budget: NAPI budget (only used as bool to determine if in NAPI context) 467 */ 468 static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 469 { 470 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 471 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 472 u32 done_pkts = 0, done_bytes = 0; 473 struct nfp_nfdk_tx_buf *ktxbufs; 474 struct device *dev = dp->dev; 475 struct netdev_queue *nd_q; 476 u32 rd_p, qcp_rd_p; 477 int todo; 478 479 rd_p = tx_ring->rd_p; 480 if (tx_ring->wr_p == rd_p) 481 return; 482 483 /* Work out how many descriptors have been transmitted */ 484 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 485 486 if (qcp_rd_p == tx_ring->qcp_rd_p) 487 return; 488 489 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 490 ktxbufs = tx_ring->ktxbufs; 491 492 while (todo > 0) { 493 const skb_frag_t *frag, *fend; 494 unsigned int size, n_descs = 1; 495 struct nfp_nfdk_tx_buf *txbuf; 496 struct sk_buff *skb; 497 498 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)]; 499 skb = txbuf->skb; 500 txbuf++; 501 502 /* Closed block */ 503 if (!skb) { 504 n_descs = D_BLOCK_CPL(rd_p); 505 goto next; 506 } 507 508 /* Unmap head */ 509 size = skb_headlen(skb); 510 n_descs += nfp_nfdk_headlen_to_segs(size); 511 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE); 512 txbuf++; 513 514 /* Unmap frags */ 515 frag = skb_shinfo(skb)->frags; 516 fend = frag + skb_shinfo(skb)->nr_frags; 517 for (; frag < fend; frag++) { 518 size = skb_frag_size(frag); 519 n_descs += DIV_ROUND_UP(size, 520 NFDK_TX_MAX_DATA_PER_DESC); 521 dma_unmap_page(dev, txbuf->dma_addr, 522 skb_frag_size(frag), DMA_TO_DEVICE); 523 txbuf++; 524 } 525 526 if (!skb_is_gso(skb)) { 527 done_bytes += skb->len; 528 done_pkts++; 529 } else { 530 done_bytes += txbuf->real_len; 531 done_pkts += txbuf->pkt_cnt; 532 n_descs++; 533 } 534 535 napi_consume_skb(skb, budget); 536 next: 537 rd_p += n_descs; 538 todo -= n_descs; 539 } 540 541 tx_ring->rd_p = rd_p; 542 tx_ring->qcp_rd_p = qcp_rd_p; 543 544 u64_stats_update_begin(&r_vec->tx_sync); 545 r_vec->tx_bytes += done_bytes; 546 r_vec->tx_pkts += done_pkts; 547 u64_stats_update_end(&r_vec->tx_sync); 548 549 if (!dp->netdev) 550 return; 551 552 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); 553 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); 554 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) { 555 /* Make sure TX thread will see updated tx_ring->rd_p */ 556 smp_mb(); 557 558 if (unlikely(netif_tx_queue_stopped(nd_q))) 559 netif_tx_wake_queue(nd_q); 560 } 561 562 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 563 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 564 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 565 } 566 567 /* Receive processing */ 568 static void * 569 nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) 570 { 571 void *frag; 572 573 if (!dp->xdp_prog) { 574 frag = napi_alloc_frag(dp->fl_bufsz); 575 if (unlikely(!frag)) 576 return NULL; 577 } else { 578 struct page *page; 579 580 page = dev_alloc_page(); 581 if (unlikely(!page)) 582 return NULL; 583 frag = page_address(page); 584 } 585 586 *dma_addr = nfp_net_dma_map_rx(dp, frag); 587 if (dma_mapping_error(dp->dev, *dma_addr)) { 588 nfp_net_free_frag(frag, dp->xdp_prog); 589 nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); 590 return NULL; 591 } 592 593 return frag; 594 } 595 596 /** 597 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings 598 * @dp: NFP Net data path struct 599 * @rx_ring: RX ring structure 600 * @frag: page fragment buffer 601 * @dma_addr: DMA address of skb mapping 602 */ 603 static void 604 nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp, 605 struct nfp_net_rx_ring *rx_ring, 606 void *frag, dma_addr_t dma_addr) 607 { 608 unsigned int wr_idx; 609 610 wr_idx = D_IDX(rx_ring, rx_ring->wr_p); 611 612 nfp_net_dma_sync_dev_rx(dp, dma_addr); 613 614 /* Stash SKB and DMA address away */ 615 rx_ring->rxbufs[wr_idx].frag = frag; 616 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; 617 618 /* Fill freelist descriptor */ 619 rx_ring->rxds[wr_idx].fld.reserved = 0; 620 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; 621 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld, 622 dma_addr + dp->rx_dma_off); 623 624 rx_ring->wr_p++; 625 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { 626 /* Update write pointer of the freelist queue. Make 627 * sure all writes are flushed before telling the hardware. 628 */ 629 wmb(); 630 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); 631 } 632 } 633 634 /** 635 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW 636 * @dp: NFP Net data path struct 637 * @rx_ring: RX ring to fill 638 */ 639 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp, 640 struct nfp_net_rx_ring *rx_ring) 641 { 642 unsigned int i; 643 644 for (i = 0; i < rx_ring->cnt - 1; i++) 645 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, 646 rx_ring->rxbufs[i].dma_addr); 647 } 648 649 /** 650 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors 651 * @flags: RX descriptor flags field in CPU byte order 652 */ 653 static int nfp_nfdk_rx_csum_has_errors(u16 flags) 654 { 655 u16 csum_all_checked, csum_all_ok; 656 657 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; 658 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; 659 660 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); 661 } 662 663 /** 664 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags 665 * @dp: NFP Net data path struct 666 * @r_vec: per-ring structure 667 * @rxd: Pointer to RX descriptor 668 * @meta: Parsed metadata prepend 669 * @skb: Pointer to SKB 670 */ 671 static void 672 nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 673 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta, 674 struct sk_buff *skb) 675 { 676 skb_checksum_none_assert(skb); 677 678 if (!(dp->netdev->features & NETIF_F_RXCSUM)) 679 return; 680 681 if (meta->csum_type) { 682 skb->ip_summed = meta->csum_type; 683 skb->csum = meta->csum; 684 u64_stats_update_begin(&r_vec->rx_sync); 685 r_vec->hw_csum_rx_complete++; 686 u64_stats_update_end(&r_vec->rx_sync); 687 return; 688 } 689 690 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { 691 u64_stats_update_begin(&r_vec->rx_sync); 692 r_vec->hw_csum_rx_error++; 693 u64_stats_update_end(&r_vec->rx_sync); 694 return; 695 } 696 697 /* Assume that the firmware will never report inner CSUM_OK unless outer 698 * L4 headers were successfully parsed. FW will always report zero UDP 699 * checksum as CSUM_OK. 700 */ 701 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || 702 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { 703 __skb_incr_checksum_unnecessary(skb); 704 u64_stats_update_begin(&r_vec->rx_sync); 705 r_vec->hw_csum_rx_ok++; 706 u64_stats_update_end(&r_vec->rx_sync); 707 } 708 709 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || 710 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { 711 __skb_incr_checksum_unnecessary(skb); 712 u64_stats_update_begin(&r_vec->rx_sync); 713 r_vec->hw_csum_rx_inner_ok++; 714 u64_stats_update_end(&r_vec->rx_sync); 715 } 716 } 717 718 static void 719 nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, 720 unsigned int type, __be32 *hash) 721 { 722 if (!(netdev->features & NETIF_F_RXHASH)) 723 return; 724 725 switch (type) { 726 case NFP_NET_RSS_IPV4: 727 case NFP_NET_RSS_IPV6: 728 case NFP_NET_RSS_IPV6_EX: 729 meta->hash_type = PKT_HASH_TYPE_L3; 730 break; 731 default: 732 meta->hash_type = PKT_HASH_TYPE_L4; 733 break; 734 } 735 736 meta->hash = get_unaligned_be32(hash); 737 } 738 739 static bool 740 nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, 741 void *data, void *pkt, unsigned int pkt_len, int meta_len) 742 { 743 u32 meta_info, vlan_info; 744 745 meta_info = get_unaligned_be32(data); 746 data += 4; 747 748 while (meta_info) { 749 switch (meta_info & NFP_NET_META_FIELD_MASK) { 750 case NFP_NET_META_HASH: 751 meta_info >>= NFP_NET_META_FIELD_SIZE; 752 nfp_nfdk_set_hash(netdev, meta, 753 meta_info & NFP_NET_META_FIELD_MASK, 754 (__be32 *)data); 755 data += 4; 756 break; 757 case NFP_NET_META_MARK: 758 meta->mark = get_unaligned_be32(data); 759 data += 4; 760 break; 761 case NFP_NET_META_VLAN: 762 vlan_info = get_unaligned_be32(data); 763 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) { 764 meta->vlan.stripped = true; 765 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK, 766 vlan_info); 767 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK, 768 vlan_info); 769 } 770 data += 4; 771 break; 772 case NFP_NET_META_PORTID: 773 meta->portid = get_unaligned_be32(data); 774 data += 4; 775 break; 776 case NFP_NET_META_CSUM: 777 meta->csum_type = CHECKSUM_COMPLETE; 778 meta->csum = 779 (__force __wsum)__get_unaligned_cpu32(data); 780 data += 4; 781 break; 782 case NFP_NET_META_RESYNC_INFO: 783 if (nfp_net_tls_rx_resync_req(netdev, data, pkt, 784 pkt_len)) 785 return false; 786 data += sizeof(struct nfp_net_tls_resync_req); 787 break; 788 #ifdef CONFIG_NFP_NET_IPSEC 789 case NFP_NET_META_IPSEC: 790 /* Note: IPsec packet could have zero saidx, so need add 1 791 * to indicate packet is IPsec packet within driver. 792 */ 793 meta->ipsec_saidx = get_unaligned_be32(data) + 1; 794 data += 4; 795 break; 796 #endif 797 default: 798 return true; 799 } 800 801 meta_info >>= NFP_NET_META_FIELD_SIZE; 802 } 803 804 return data != pkt; 805 } 806 807 static void 808 nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 809 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, 810 struct sk_buff *skb) 811 { 812 u64_stats_update_begin(&r_vec->rx_sync); 813 r_vec->rx_drops++; 814 /* If we have both skb and rxbuf the replacement buffer allocation 815 * must have failed, count this as an alloc failure. 816 */ 817 if (skb && rxbuf) 818 r_vec->rx_replace_buf_alloc_fail++; 819 u64_stats_update_end(&r_vec->rx_sync); 820 821 /* skb is build based on the frag, free_skb() would free the frag 822 * so to be able to reuse it we need an extra ref. 823 */ 824 if (skb && rxbuf && skb->head == rxbuf->frag) 825 page_ref_inc(virt_to_head_page(rxbuf->frag)); 826 if (rxbuf) 827 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); 828 if (skb) 829 dev_kfree_skb_any(skb); 830 } 831 832 static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring) 833 { 834 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 835 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 836 struct nfp_net_rx_ring *rx_ring; 837 u32 qcp_rd_p, done = 0; 838 bool done_all; 839 int todo; 840 841 /* Work out how many descriptors have been transmitted */ 842 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 843 if (qcp_rd_p == tx_ring->qcp_rd_p) 844 return true; 845 846 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 847 848 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; 849 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); 850 851 rx_ring = r_vec->rx_ring; 852 while (todo > 0) { 853 int idx = D_IDX(tx_ring, tx_ring->rd_p + done); 854 struct nfp_nfdk_tx_buf *txbuf; 855 unsigned int step = 1; 856 857 txbuf = &tx_ring->ktxbufs[idx]; 858 if (!txbuf->raw) 859 goto next; 860 861 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) { 862 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n"); 863 goto next; 864 } 865 866 /* Two successive txbufs are used to stash virtual and dma 867 * address respectively, recycle and clean them here. 868 */ 869 nfp_nfdk_rx_give_one(dp, rx_ring, 870 (void *)NFDK_TX_BUF_PTR(txbuf[0].val), 871 txbuf[1].dma_addr); 872 txbuf[0].raw = 0; 873 txbuf[1].raw = 0; 874 step = 2; 875 876 u64_stats_update_begin(&r_vec->tx_sync); 877 /* Note: tx_bytes not accumulated. */ 878 r_vec->tx_pkts++; 879 u64_stats_update_end(&r_vec->tx_sync); 880 next: 881 todo -= step; 882 done += step; 883 } 884 885 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done); 886 tx_ring->rd_p += done; 887 888 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 889 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 890 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 891 892 return done_all; 893 } 894 895 static bool 896 nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, 897 struct nfp_net_tx_ring *tx_ring, 898 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, 899 unsigned int pkt_len, bool *completed) 900 { 901 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; 902 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen; 903 struct nfp_nfdk_tx_buf *txbuf; 904 struct nfp_nfdk_tx_desc *txd; 905 unsigned int n_descs; 906 dma_addr_t dma_addr; 907 int wr_idx; 908 909 /* Reject if xdp_adjust_tail grow packet beyond DMA area */ 910 if (pkt_len + dma_off > dma_map_sz) 911 return false; 912 913 /* Make sure there's still at least one block available after 914 * aligning to block boundary, so that the txds used below 915 * won't wrap around the tx_ring. 916 */ 917 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 918 if (!*completed) { 919 nfp_nfdk_xdp_complete(tx_ring); 920 *completed = true; 921 } 922 923 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 924 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, 925 NULL); 926 return false; 927 } 928 } 929 930 /* Check if cross block boundary */ 931 n_descs = nfp_nfdk_headlen_to_segs(pkt_len); 932 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != 933 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) || 934 ((u32)tx_ring->data_pending + pkt_len > 935 NFDK_TX_MAX_DATA_PER_BLOCK)) { 936 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p); 937 938 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 939 txd = &tx_ring->ktxds[wr_idx]; 940 memset(txd, 0, 941 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); 942 943 tx_ring->data_pending = 0; 944 tx_ring->wr_p += nop_slots; 945 tx_ring->wr_ptr_add += nop_slots; 946 } 947 948 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 949 950 txbuf = &tx_ring->ktxbufs[wr_idx]; 951 952 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP; 953 txbuf[1].dma_addr = rxbuf->dma_addr; 954 /* Note: pkt len not stored */ 955 956 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, 957 pkt_len, DMA_BIDIRECTIONAL); 958 959 /* Build TX descriptor */ 960 txd = &tx_ring->ktxds[wr_idx]; 961 dma_len = pkt_len; 962 dma_addr = rxbuf->dma_addr + dma_off; 963 964 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD) 965 type = NFDK_DESC_TX_TYPE_SIMPLE; 966 else 967 type = NFDK_DESC_TX_TYPE_GATHER; 968 969 /* FIELD_PREP() implicitly truncates to chunk */ 970 dma_len -= 1; 971 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, 972 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ? 973 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) | 974 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); 975 976 txd->dma_len_type = cpu_to_le16(dlen_type); 977 nfp_desc_set_dma_addr_48b(txd, dma_addr); 978 979 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; 980 dma_len -= tmp_dlen; 981 dma_addr += tmp_dlen + 1; 982 txd++; 983 984 while (dma_len > 0) { 985 dma_len -= 1; 986 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); 987 txd->dma_len_type = cpu_to_le16(dlen_type); 988 nfp_desc_set_dma_addr_48b(txd, dma_addr); 989 990 dlen_type &= NFDK_DESC_TX_DMA_LEN; 991 dma_len -= dlen_type; 992 dma_addr += dlen_type + 1; 993 txd++; 994 } 995 996 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); 997 998 /* Metadata desc */ 999 txd->raw = 0; 1000 txd++; 1001 1002 cnt = txd - tx_ring->ktxds - wr_idx; 1003 tx_ring->wr_p += cnt; 1004 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 1005 tx_ring->data_pending += pkt_len; 1006 else 1007 tx_ring->data_pending = 0; 1008 1009 tx_ring->wr_ptr_add += cnt; 1010 return true; 1011 } 1012 1013 /** 1014 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring 1015 * @rx_ring: RX ring to receive from 1016 * @budget: NAPI budget 1017 * 1018 * Note, this function is separated out from the napi poll function to 1019 * more cleanly separate packet receive code from other bookkeeping 1020 * functions performed in the napi poll function. 1021 * 1022 * Return: Number of packets received. 1023 */ 1024 static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget) 1025 { 1026 struct nfp_net_r_vector *r_vec = rx_ring->r_vec; 1027 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 1028 struct nfp_net_tx_ring *tx_ring; 1029 struct bpf_prog *xdp_prog; 1030 bool xdp_tx_cmpl = false; 1031 unsigned int true_bufsz; 1032 struct sk_buff *skb; 1033 int pkts_polled = 0; 1034 struct xdp_buff xdp; 1035 int idx; 1036 1037 xdp_prog = READ_ONCE(dp->xdp_prog); 1038 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; 1039 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, 1040 &rx_ring->xdp_rxq); 1041 tx_ring = r_vec->xdp_ring; 1042 1043 while (pkts_polled < budget) { 1044 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 1045 struct nfp_net_rx_buf *rxbuf; 1046 struct nfp_net_rx_desc *rxd; 1047 struct nfp_meta_parsed meta; 1048 bool redir_egress = false; 1049 struct net_device *netdev; 1050 dma_addr_t new_dma_addr; 1051 u32 meta_len_xdp = 0; 1052 void *new_frag; 1053 1054 idx = D_IDX(rx_ring, rx_ring->rd_p); 1055 1056 rxd = &rx_ring->rxds[idx]; 1057 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 1058 break; 1059 1060 /* Memory barrier to ensure that we won't do other reads 1061 * before the DD bit. 1062 */ 1063 dma_rmb(); 1064 1065 memset(&meta, 0, sizeof(meta)); 1066 1067 rx_ring->rd_p++; 1068 pkts_polled++; 1069 1070 rxbuf = &rx_ring->rxbufs[idx]; 1071 /* < meta_len > 1072 * <-- [rx_offset] --> 1073 * --------------------------------------------------------- 1074 * | [XX] | metadata | packet | XXXX | 1075 * --------------------------------------------------------- 1076 * <---------------- data_len ---------------> 1077 * 1078 * The rx_offset is fixed for all packets, the meta_len can vary 1079 * on a packet by packet basis. If rx_offset is set to zero 1080 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the 1081 * buffer and is immediately followed by the packet (no [XX]). 1082 */ 1083 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 1084 data_len = le16_to_cpu(rxd->rxd.data_len); 1085 pkt_len = data_len - meta_len; 1086 1087 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 1088 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 1089 pkt_off += meta_len; 1090 else 1091 pkt_off += dp->rx_offset; 1092 meta_off = pkt_off - meta_len; 1093 1094 /* Stats update */ 1095 u64_stats_update_begin(&r_vec->rx_sync); 1096 r_vec->rx_pkts++; 1097 r_vec->rx_bytes += pkt_len; 1098 u64_stats_update_end(&r_vec->rx_sync); 1099 1100 if (unlikely(meta_len > NFP_NET_MAX_PREPEND || 1101 (dp->rx_offset && meta_len > dp->rx_offset))) { 1102 nn_dp_warn(dp, "oversized RX packet metadata %u\n", 1103 meta_len); 1104 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1105 continue; 1106 } 1107 1108 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, 1109 data_len); 1110 1111 if (meta_len) { 1112 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta, 1113 rxbuf->frag + meta_off, 1114 rxbuf->frag + pkt_off, 1115 pkt_len, meta_len))) { 1116 nn_dp_warn(dp, "invalid RX packet metadata\n"); 1117 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, 1118 NULL); 1119 continue; 1120 } 1121 } 1122 1123 if (xdp_prog && !meta.portid) { 1124 void *orig_data = rxbuf->frag + pkt_off; 1125 unsigned int dma_off; 1126 int act; 1127 1128 xdp_prepare_buff(&xdp, 1129 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, 1130 pkt_off - NFP_NET_RX_BUF_HEADROOM, 1131 pkt_len, true); 1132 1133 act = bpf_prog_run_xdp(xdp_prog, &xdp); 1134 1135 pkt_len = xdp.data_end - xdp.data; 1136 pkt_off += xdp.data - orig_data; 1137 1138 switch (act) { 1139 case XDP_PASS: 1140 meta_len_xdp = xdp.data - xdp.data_meta; 1141 break; 1142 case XDP_TX: 1143 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; 1144 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring, 1145 tx_ring, 1146 rxbuf, 1147 dma_off, 1148 pkt_len, 1149 &xdp_tx_cmpl))) 1150 trace_xdp_exception(dp->netdev, 1151 xdp_prog, act); 1152 continue; 1153 default: 1154 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act); 1155 fallthrough; 1156 case XDP_ABORTED: 1157 trace_xdp_exception(dp->netdev, xdp_prog, act); 1158 fallthrough; 1159 case XDP_DROP: 1160 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, 1161 rxbuf->dma_addr); 1162 continue; 1163 } 1164 } 1165 1166 if (likely(!meta.portid)) { 1167 netdev = dp->netdev; 1168 } else if (meta.portid == NFP_META_PORT_ID_CTRL) { 1169 struct nfp_net *nn = netdev_priv(dp->netdev); 1170 1171 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, 1172 pkt_len); 1173 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, 1174 rxbuf->dma_addr); 1175 continue; 1176 } else { 1177 struct nfp_net *nn; 1178 1179 nn = netdev_priv(dp->netdev); 1180 netdev = nfp_app_dev_get(nn->app, meta.portid, 1181 &redir_egress); 1182 if (unlikely(!netdev)) { 1183 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, 1184 NULL); 1185 continue; 1186 } 1187 1188 if (nfp_netdev_is_nfp_repr(netdev)) 1189 nfp_repr_inc_rx_stats(netdev, pkt_len); 1190 } 1191 1192 skb = build_skb(rxbuf->frag, true_bufsz); 1193 if (unlikely(!skb)) { 1194 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1195 continue; 1196 } 1197 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); 1198 if (unlikely(!new_frag)) { 1199 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1200 continue; 1201 } 1202 1203 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1204 1205 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1206 1207 skb_reserve(skb, pkt_off); 1208 skb_put(skb, pkt_len); 1209 1210 skb->mark = meta.mark; 1211 skb_set_hash(skb, meta.hash, meta.hash_type); 1212 1213 skb_record_rx_queue(skb, rx_ring->idx); 1214 skb->protocol = eth_type_trans(skb, netdev); 1215 1216 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb); 1217 1218 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) { 1219 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb); 1220 continue; 1221 } 1222 1223 #ifdef CONFIG_NFP_NET_IPSEC 1224 if (meta.ipsec_saidx != 0 && unlikely(nfp_net_ipsec_rx(&meta, skb))) { 1225 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb); 1226 continue; 1227 } 1228 #endif 1229 1230 if (meta_len_xdp) 1231 skb_metadata_set(skb, meta_len_xdp); 1232 1233 if (likely(!redir_egress)) { 1234 napi_gro_receive(&rx_ring->r_vec->napi, skb); 1235 } else { 1236 skb->dev = netdev; 1237 skb_reset_network_header(skb); 1238 __skb_push(skb, ETH_HLEN); 1239 dev_queue_xmit(skb); 1240 } 1241 } 1242 1243 if (xdp_prog) { 1244 if (tx_ring->wr_ptr_add) 1245 nfp_net_tx_xmit_more_flush(tx_ring); 1246 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && 1247 !xdp_tx_cmpl) 1248 if (!nfp_nfdk_xdp_complete(tx_ring)) 1249 pkts_polled = budget; 1250 } 1251 1252 return pkts_polled; 1253 } 1254 1255 /** 1256 * nfp_nfdk_poll() - napi poll function 1257 * @napi: NAPI structure 1258 * @budget: NAPI budget 1259 * 1260 * Return: number of packets polled. 1261 */ 1262 int nfp_nfdk_poll(struct napi_struct *napi, int budget) 1263 { 1264 struct nfp_net_r_vector *r_vec = 1265 container_of(napi, struct nfp_net_r_vector, napi); 1266 unsigned int pkts_polled = 0; 1267 1268 if (r_vec->tx_ring) 1269 nfp_nfdk_tx_complete(r_vec->tx_ring, budget); 1270 if (r_vec->rx_ring) 1271 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget); 1272 1273 if (pkts_polled < budget) 1274 if (napi_complete_done(napi, pkts_polled)) 1275 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1276 1277 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) { 1278 struct dim_sample dim_sample = {}; 1279 unsigned int start; 1280 u64 pkts, bytes; 1281 1282 do { 1283 start = u64_stats_fetch_begin(&r_vec->rx_sync); 1284 pkts = r_vec->rx_pkts; 1285 bytes = r_vec->rx_bytes; 1286 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); 1287 1288 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1289 net_dim(&r_vec->rx_dim, dim_sample); 1290 } 1291 1292 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) { 1293 struct dim_sample dim_sample = {}; 1294 unsigned int start; 1295 u64 pkts, bytes; 1296 1297 do { 1298 start = u64_stats_fetch_begin(&r_vec->tx_sync); 1299 pkts = r_vec->tx_pkts; 1300 bytes = r_vec->tx_bytes; 1301 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); 1302 1303 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1304 net_dim(&r_vec->tx_dim, dim_sample); 1305 } 1306 1307 return pkts_polled; 1308 } 1309 1310 /* Control device data path 1311 */ 1312 1313 bool 1314 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, 1315 struct sk_buff *skb, bool old) 1316 { 1317 u32 cnt, tmp_dlen, dlen_type = 0; 1318 struct nfp_net_tx_ring *tx_ring; 1319 struct nfp_nfdk_tx_buf *txbuf; 1320 struct nfp_nfdk_tx_desc *txd; 1321 unsigned int dma_len, type; 1322 struct nfp_net_dp *dp; 1323 dma_addr_t dma_addr; 1324 u64 metadata = 0; 1325 int wr_idx; 1326 1327 dp = &r_vec->nfp_net->dp; 1328 tx_ring = r_vec->tx_ring; 1329 1330 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { 1331 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); 1332 goto err_free; 1333 } 1334 1335 /* Don't bother counting frags, assume the worst */ 1336 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 1337 u64_stats_update_begin(&r_vec->tx_sync); 1338 r_vec->tx_busy++; 1339 u64_stats_update_end(&r_vec->tx_sync); 1340 if (!old) 1341 __skb_queue_tail(&r_vec->queue, skb); 1342 else 1343 __skb_queue_head(&r_vec->queue, skb); 1344 return NETDEV_TX_BUSY; 1345 } 1346 1347 if (nfp_app_ctrl_has_meta(nn->app)) { 1348 if (unlikely(skb_headroom(skb) < 8)) { 1349 nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); 1350 goto err_free; 1351 } 1352 metadata = NFDK_DESC_TX_CHAIN_META; 1353 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); 1354 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) | 1355 FIELD_PREP(NFDK_META_FIELDS, 1356 NFP_NET_META_PORTID), 1357 skb_push(skb, 4)); 1358 } 1359 1360 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb)) 1361 goto err_free; 1362 1363 /* DMA map all */ 1364 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 1365 txd = &tx_ring->ktxds[wr_idx]; 1366 txbuf = &tx_ring->ktxbufs[wr_idx]; 1367 1368 dma_len = skb_headlen(skb); 1369 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD) 1370 type = NFDK_DESC_TX_TYPE_SIMPLE; 1371 else 1372 type = NFDK_DESC_TX_TYPE_GATHER; 1373 1374 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); 1375 if (dma_mapping_error(dp->dev, dma_addr)) 1376 goto err_warn_dma; 1377 1378 txbuf->skb = skb; 1379 txbuf++; 1380 1381 txbuf->dma_addr = dma_addr; 1382 txbuf++; 1383 1384 dma_len -= 1; 1385 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, 1386 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ? 1387 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) | 1388 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); 1389 1390 txd->dma_len_type = cpu_to_le16(dlen_type); 1391 nfp_desc_set_dma_addr_48b(txd, dma_addr); 1392 1393 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; 1394 dma_len -= tmp_dlen; 1395 dma_addr += tmp_dlen + 1; 1396 txd++; 1397 1398 while (dma_len > 0) { 1399 dma_len -= 1; 1400 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); 1401 txd->dma_len_type = cpu_to_le16(dlen_type); 1402 nfp_desc_set_dma_addr_48b(txd, dma_addr); 1403 1404 dlen_type &= NFDK_DESC_TX_DMA_LEN; 1405 dma_len -= dlen_type; 1406 dma_addr += dlen_type + 1; 1407 txd++; 1408 } 1409 1410 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); 1411 1412 /* Metadata desc */ 1413 txd->raw = cpu_to_le64(metadata); 1414 txd++; 1415 1416 cnt = txd - tx_ring->ktxds - wr_idx; 1417 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != 1418 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) 1419 goto err_warn_overflow; 1420 1421 tx_ring->wr_p += cnt; 1422 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 1423 tx_ring->data_pending += skb->len; 1424 else 1425 tx_ring->data_pending = 0; 1426 1427 tx_ring->wr_ptr_add += cnt; 1428 nfp_net_tx_xmit_more_flush(tx_ring); 1429 1430 return NETDEV_TX_OK; 1431 1432 err_warn_overflow: 1433 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", 1434 wr_idx, skb_headlen(skb), 0, cnt); 1435 txbuf--; 1436 dma_unmap_single(dp->dev, txbuf->dma_addr, 1437 skb_headlen(skb), DMA_TO_DEVICE); 1438 txbuf->raw = 0; 1439 err_warn_dma: 1440 nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); 1441 err_free: 1442 u64_stats_update_begin(&r_vec->tx_sync); 1443 r_vec->tx_errors++; 1444 u64_stats_update_end(&r_vec->tx_sync); 1445 dev_kfree_skb_any(skb); 1446 return NETDEV_TX_OK; 1447 } 1448 1449 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) 1450 { 1451 struct sk_buff *skb; 1452 1453 while ((skb = __skb_dequeue(&r_vec->queue))) 1454 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) 1455 return; 1456 } 1457 1458 static bool 1459 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) 1460 { 1461 u32 meta_type, meta_tag; 1462 1463 if (!nfp_app_ctrl_has_meta(nn->app)) 1464 return !meta_len; 1465 1466 if (meta_len != 8) 1467 return false; 1468 1469 meta_type = get_unaligned_be32(data); 1470 meta_tag = get_unaligned_be32(data + 4); 1471 1472 return (meta_type == NFP_NET_META_PORTID && 1473 meta_tag == NFP_META_PORT_ID_CTRL); 1474 } 1475 1476 static bool 1477 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, 1478 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) 1479 { 1480 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 1481 struct nfp_net_rx_buf *rxbuf; 1482 struct nfp_net_rx_desc *rxd; 1483 dma_addr_t new_dma_addr; 1484 struct sk_buff *skb; 1485 void *new_frag; 1486 int idx; 1487 1488 idx = D_IDX(rx_ring, rx_ring->rd_p); 1489 1490 rxd = &rx_ring->rxds[idx]; 1491 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 1492 return false; 1493 1494 /* Memory barrier to ensure that we won't do other reads 1495 * before the DD bit. 1496 */ 1497 dma_rmb(); 1498 1499 rx_ring->rd_p++; 1500 1501 rxbuf = &rx_ring->rxbufs[idx]; 1502 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 1503 data_len = le16_to_cpu(rxd->rxd.data_len); 1504 pkt_len = data_len - meta_len; 1505 1506 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 1507 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 1508 pkt_off += meta_len; 1509 else 1510 pkt_off += dp->rx_offset; 1511 meta_off = pkt_off - meta_len; 1512 1513 /* Stats update */ 1514 u64_stats_update_begin(&r_vec->rx_sync); 1515 r_vec->rx_pkts++; 1516 r_vec->rx_bytes += pkt_len; 1517 u64_stats_update_end(&r_vec->rx_sync); 1518 1519 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); 1520 1521 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { 1522 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", 1523 meta_len); 1524 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1525 return true; 1526 } 1527 1528 skb = build_skb(rxbuf->frag, dp->fl_bufsz); 1529 if (unlikely(!skb)) { 1530 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1531 return true; 1532 } 1533 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); 1534 if (unlikely(!new_frag)) { 1535 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1536 return true; 1537 } 1538 1539 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1540 1541 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1542 1543 skb_reserve(skb, pkt_off); 1544 skb_put(skb, pkt_len); 1545 1546 nfp_app_ctrl_rx(nn->app, skb); 1547 1548 return true; 1549 } 1550 1551 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) 1552 { 1553 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; 1554 struct nfp_net *nn = r_vec->nfp_net; 1555 struct nfp_net_dp *dp = &nn->dp; 1556 unsigned int budget = 512; 1557 1558 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) 1559 continue; 1560 1561 return budget; 1562 } 1563 1564 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t) 1565 { 1566 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); 1567 1568 spin_lock(&r_vec->lock); 1569 nfp_nfdk_tx_complete(r_vec->tx_ring, 0); 1570 __nfp_ctrl_tx_queued(r_vec); 1571 spin_unlock(&r_vec->lock); 1572 1573 if (nfp_ctrl_rx(r_vec)) { 1574 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1575 } else { 1576 tasklet_schedule(&r_vec->tasklet); 1577 nn_dp_warn(&r_vec->nfp_net->dp, 1578 "control message budget exceeded!\n"); 1579 } 1580 } 1581