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 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata); 391 txd->raw = cpu_to_le64(metadata); 392 txd++; 393 } else { 394 /* lso desc should be placed after metadata desc */ 395 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb); 396 real_len = txbuf->real_len; 397 /* Metadata desc */ 398 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata); 399 txd->raw = cpu_to_le64(metadata); 400 txd += 2; 401 txbuf++; 402 } 403 404 cnt = txd - tx_ring->ktxds - wr_idx; 405 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != 406 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) 407 goto err_warn_overflow; 408 409 skb_tx_timestamp(skb); 410 411 tx_ring->wr_p += cnt; 412 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 413 tx_ring->data_pending += skb->len; 414 else 415 tx_ring->data_pending = 0; 416 417 if (nfp_nfdk_tx_ring_should_stop(tx_ring)) 418 nfp_nfdk_tx_ring_stop(nd_q, tx_ring); 419 420 tx_ring->wr_ptr_add += cnt; 421 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more())) 422 nfp_net_tx_xmit_more_flush(tx_ring); 423 424 return NETDEV_TX_OK; 425 426 err_warn_overflow: 427 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", 428 wr_idx, skb_headlen(skb), nr_frags, cnt); 429 if (skb_is_gso(skb)) 430 txbuf--; 431 err_unmap: 432 /* txbuf pointed to the next-to-use */ 433 etxbuf = txbuf; 434 /* first txbuf holds the skb */ 435 txbuf = &tx_ring->ktxbufs[wr_idx + 1]; 436 if (txbuf < etxbuf) { 437 dma_unmap_single(dp->dev, txbuf->dma_addr, 438 skb_headlen(skb), DMA_TO_DEVICE); 439 txbuf->raw = 0; 440 txbuf++; 441 } 442 frag = skb_shinfo(skb)->frags; 443 while (etxbuf < txbuf) { 444 dma_unmap_page(dp->dev, txbuf->dma_addr, 445 skb_frag_size(frag), DMA_TO_DEVICE); 446 txbuf->raw = 0; 447 frag++; 448 txbuf++; 449 } 450 err_warn_dma: 451 nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); 452 err_flush: 453 nfp_net_tx_xmit_more_flush(tx_ring); 454 u64_stats_update_begin(&r_vec->tx_sync); 455 r_vec->tx_errors++; 456 u64_stats_update_end(&r_vec->tx_sync); 457 dev_kfree_skb_any(skb); 458 return NETDEV_TX_OK; 459 } 460 461 /** 462 * nfp_nfdk_tx_complete() - Handled completed TX packets 463 * @tx_ring: TX ring structure 464 * @budget: NAPI budget (only used as bool to determine if in NAPI context) 465 */ 466 static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) 467 { 468 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 469 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 470 u32 done_pkts = 0, done_bytes = 0; 471 struct nfp_nfdk_tx_buf *ktxbufs; 472 struct device *dev = dp->dev; 473 struct netdev_queue *nd_q; 474 u32 rd_p, qcp_rd_p; 475 int todo; 476 477 rd_p = tx_ring->rd_p; 478 if (tx_ring->wr_p == rd_p) 479 return; 480 481 /* Work out how many descriptors have been transmitted */ 482 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 483 484 if (qcp_rd_p == tx_ring->qcp_rd_p) 485 return; 486 487 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 488 ktxbufs = tx_ring->ktxbufs; 489 490 while (todo > 0) { 491 const skb_frag_t *frag, *fend; 492 unsigned int size, n_descs = 1; 493 struct nfp_nfdk_tx_buf *txbuf; 494 struct sk_buff *skb; 495 496 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)]; 497 skb = txbuf->skb; 498 txbuf++; 499 500 /* Closed block */ 501 if (!skb) { 502 n_descs = D_BLOCK_CPL(rd_p); 503 goto next; 504 } 505 506 /* Unmap head */ 507 size = skb_headlen(skb); 508 n_descs += nfp_nfdk_headlen_to_segs(size); 509 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE); 510 txbuf++; 511 512 /* Unmap frags */ 513 frag = skb_shinfo(skb)->frags; 514 fend = frag + skb_shinfo(skb)->nr_frags; 515 for (; frag < fend; frag++) { 516 size = skb_frag_size(frag); 517 n_descs += DIV_ROUND_UP(size, 518 NFDK_TX_MAX_DATA_PER_DESC); 519 dma_unmap_page(dev, txbuf->dma_addr, 520 skb_frag_size(frag), DMA_TO_DEVICE); 521 txbuf++; 522 } 523 524 if (!skb_is_gso(skb)) { 525 done_bytes += skb->len; 526 done_pkts++; 527 } else { 528 done_bytes += txbuf->real_len; 529 done_pkts += txbuf->pkt_cnt; 530 n_descs++; 531 } 532 533 napi_consume_skb(skb, budget); 534 next: 535 rd_p += n_descs; 536 todo -= n_descs; 537 } 538 539 tx_ring->rd_p = rd_p; 540 tx_ring->qcp_rd_p = qcp_rd_p; 541 542 u64_stats_update_begin(&r_vec->tx_sync); 543 r_vec->tx_bytes += done_bytes; 544 r_vec->tx_pkts += done_pkts; 545 u64_stats_update_end(&r_vec->tx_sync); 546 547 if (!dp->netdev) 548 return; 549 550 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); 551 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); 552 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) { 553 /* Make sure TX thread will see updated tx_ring->rd_p */ 554 smp_mb(); 555 556 if (unlikely(netif_tx_queue_stopped(nd_q))) 557 netif_tx_wake_queue(nd_q); 558 } 559 560 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 561 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 562 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 563 } 564 565 /* Receive processing */ 566 static void * 567 nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) 568 { 569 void *frag; 570 571 if (!dp->xdp_prog) { 572 frag = napi_alloc_frag(dp->fl_bufsz); 573 if (unlikely(!frag)) 574 return NULL; 575 } else { 576 struct page *page; 577 578 page = dev_alloc_page(); 579 if (unlikely(!page)) 580 return NULL; 581 frag = page_address(page); 582 } 583 584 *dma_addr = nfp_net_dma_map_rx(dp, frag); 585 if (dma_mapping_error(dp->dev, *dma_addr)) { 586 nfp_net_free_frag(frag, dp->xdp_prog); 587 nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); 588 return NULL; 589 } 590 591 return frag; 592 } 593 594 /** 595 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings 596 * @dp: NFP Net data path struct 597 * @rx_ring: RX ring structure 598 * @frag: page fragment buffer 599 * @dma_addr: DMA address of skb mapping 600 */ 601 static void 602 nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp, 603 struct nfp_net_rx_ring *rx_ring, 604 void *frag, dma_addr_t dma_addr) 605 { 606 unsigned int wr_idx; 607 608 wr_idx = D_IDX(rx_ring, rx_ring->wr_p); 609 610 nfp_net_dma_sync_dev_rx(dp, dma_addr); 611 612 /* Stash SKB and DMA address away */ 613 rx_ring->rxbufs[wr_idx].frag = frag; 614 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; 615 616 /* Fill freelist descriptor */ 617 rx_ring->rxds[wr_idx].fld.reserved = 0; 618 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; 619 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld, 620 dma_addr + dp->rx_dma_off); 621 622 rx_ring->wr_p++; 623 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { 624 /* Update write pointer of the freelist queue. Make 625 * sure all writes are flushed before telling the hardware. 626 */ 627 wmb(); 628 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); 629 } 630 } 631 632 /** 633 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW 634 * @dp: NFP Net data path struct 635 * @rx_ring: RX ring to fill 636 */ 637 void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp, 638 struct nfp_net_rx_ring *rx_ring) 639 { 640 unsigned int i; 641 642 for (i = 0; i < rx_ring->cnt - 1; i++) 643 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, 644 rx_ring->rxbufs[i].dma_addr); 645 } 646 647 /** 648 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors 649 * @flags: RX descriptor flags field in CPU byte order 650 */ 651 static int nfp_nfdk_rx_csum_has_errors(u16 flags) 652 { 653 u16 csum_all_checked, csum_all_ok; 654 655 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; 656 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; 657 658 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); 659 } 660 661 /** 662 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags 663 * @dp: NFP Net data path struct 664 * @r_vec: per-ring structure 665 * @rxd: Pointer to RX descriptor 666 * @meta: Parsed metadata prepend 667 * @skb: Pointer to SKB 668 */ 669 static void 670 nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 671 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta, 672 struct sk_buff *skb) 673 { 674 skb_checksum_none_assert(skb); 675 676 if (!(dp->netdev->features & NETIF_F_RXCSUM)) 677 return; 678 679 if (meta->csum_type) { 680 skb->ip_summed = meta->csum_type; 681 skb->csum = meta->csum; 682 u64_stats_update_begin(&r_vec->rx_sync); 683 r_vec->hw_csum_rx_complete++; 684 u64_stats_update_end(&r_vec->rx_sync); 685 return; 686 } 687 688 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { 689 u64_stats_update_begin(&r_vec->rx_sync); 690 r_vec->hw_csum_rx_error++; 691 u64_stats_update_end(&r_vec->rx_sync); 692 return; 693 } 694 695 /* Assume that the firmware will never report inner CSUM_OK unless outer 696 * L4 headers were successfully parsed. FW will always report zero UDP 697 * checksum as CSUM_OK. 698 */ 699 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || 700 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { 701 __skb_incr_checksum_unnecessary(skb); 702 u64_stats_update_begin(&r_vec->rx_sync); 703 r_vec->hw_csum_rx_ok++; 704 u64_stats_update_end(&r_vec->rx_sync); 705 } 706 707 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || 708 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { 709 __skb_incr_checksum_unnecessary(skb); 710 u64_stats_update_begin(&r_vec->rx_sync); 711 r_vec->hw_csum_rx_inner_ok++; 712 u64_stats_update_end(&r_vec->rx_sync); 713 } 714 } 715 716 static void 717 nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, 718 unsigned int type, __be32 *hash) 719 { 720 if (!(netdev->features & NETIF_F_RXHASH)) 721 return; 722 723 switch (type) { 724 case NFP_NET_RSS_IPV4: 725 case NFP_NET_RSS_IPV6: 726 case NFP_NET_RSS_IPV6_EX: 727 meta->hash_type = PKT_HASH_TYPE_L3; 728 break; 729 default: 730 meta->hash_type = PKT_HASH_TYPE_L4; 731 break; 732 } 733 734 meta->hash = get_unaligned_be32(hash); 735 } 736 737 static bool 738 nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, 739 void *data, void *pkt, unsigned int pkt_len, int meta_len) 740 { 741 u32 meta_info, vlan_info; 742 743 meta_info = get_unaligned_be32(data); 744 data += 4; 745 746 while (meta_info) { 747 switch (meta_info & NFP_NET_META_FIELD_MASK) { 748 case NFP_NET_META_HASH: 749 meta_info >>= NFP_NET_META_FIELD_SIZE; 750 nfp_nfdk_set_hash(netdev, meta, 751 meta_info & NFP_NET_META_FIELD_MASK, 752 (__be32 *)data); 753 data += 4; 754 break; 755 case NFP_NET_META_MARK: 756 meta->mark = get_unaligned_be32(data); 757 data += 4; 758 break; 759 case NFP_NET_META_VLAN: 760 vlan_info = get_unaligned_be32(data); 761 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) { 762 meta->vlan.stripped = true; 763 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK, 764 vlan_info); 765 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK, 766 vlan_info); 767 } 768 data += 4; 769 break; 770 case NFP_NET_META_PORTID: 771 meta->portid = get_unaligned_be32(data); 772 data += 4; 773 break; 774 case NFP_NET_META_CSUM: 775 meta->csum_type = CHECKSUM_COMPLETE; 776 meta->csum = 777 (__force __wsum)__get_unaligned_cpu32(data); 778 data += 4; 779 break; 780 case NFP_NET_META_RESYNC_INFO: 781 if (nfp_net_tls_rx_resync_req(netdev, data, pkt, 782 pkt_len)) 783 return false; 784 data += sizeof(struct nfp_net_tls_resync_req); 785 break; 786 #ifdef CONFIG_NFP_NET_IPSEC 787 case NFP_NET_META_IPSEC: 788 /* Note: IPsec packet could have zero saidx, so need add 1 789 * to indicate packet is IPsec packet within driver. 790 */ 791 meta->ipsec_saidx = get_unaligned_be32(data) + 1; 792 data += 4; 793 break; 794 #endif 795 default: 796 return true; 797 } 798 799 meta_info >>= NFP_NET_META_FIELD_SIZE; 800 } 801 802 return data != pkt; 803 } 804 805 static void 806 nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, 807 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, 808 struct sk_buff *skb) 809 { 810 u64_stats_update_begin(&r_vec->rx_sync); 811 r_vec->rx_drops++; 812 /* If we have both skb and rxbuf the replacement buffer allocation 813 * must have failed, count this as an alloc failure. 814 */ 815 if (skb && rxbuf) 816 r_vec->rx_replace_buf_alloc_fail++; 817 u64_stats_update_end(&r_vec->rx_sync); 818 819 /* skb is build based on the frag, free_skb() would free the frag 820 * so to be able to reuse it we need an extra ref. 821 */ 822 if (skb && rxbuf && skb->head == rxbuf->frag) 823 page_ref_inc(virt_to_head_page(rxbuf->frag)); 824 if (rxbuf) 825 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); 826 if (skb) 827 dev_kfree_skb_any(skb); 828 } 829 830 static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring) 831 { 832 struct nfp_net_r_vector *r_vec = tx_ring->r_vec; 833 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 834 struct nfp_net_rx_ring *rx_ring; 835 u32 qcp_rd_p, done = 0; 836 bool done_all; 837 int todo; 838 839 /* Work out how many descriptors have been transmitted */ 840 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); 841 if (qcp_rd_p == tx_ring->qcp_rd_p) 842 return true; 843 844 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); 845 846 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; 847 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); 848 849 rx_ring = r_vec->rx_ring; 850 while (todo > 0) { 851 int idx = D_IDX(tx_ring, tx_ring->rd_p + done); 852 struct nfp_nfdk_tx_buf *txbuf; 853 unsigned int step = 1; 854 855 txbuf = &tx_ring->ktxbufs[idx]; 856 if (!txbuf->raw) 857 goto next; 858 859 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) { 860 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n"); 861 goto next; 862 } 863 864 /* Two successive txbufs are used to stash virtual and dma 865 * address respectively, recycle and clean them here. 866 */ 867 nfp_nfdk_rx_give_one(dp, rx_ring, 868 (void *)NFDK_TX_BUF_PTR(txbuf[0].val), 869 txbuf[1].dma_addr); 870 txbuf[0].raw = 0; 871 txbuf[1].raw = 0; 872 step = 2; 873 874 u64_stats_update_begin(&r_vec->tx_sync); 875 /* Note: tx_bytes not accumulated. */ 876 r_vec->tx_pkts++; 877 u64_stats_update_end(&r_vec->tx_sync); 878 next: 879 todo -= step; 880 done += step; 881 } 882 883 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done); 884 tx_ring->rd_p += done; 885 886 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, 887 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", 888 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); 889 890 return done_all; 891 } 892 893 static bool 894 nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, 895 struct nfp_net_tx_ring *tx_ring, 896 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, 897 unsigned int pkt_len, bool *completed) 898 { 899 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; 900 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen; 901 struct nfp_nfdk_tx_buf *txbuf; 902 struct nfp_nfdk_tx_desc *txd; 903 unsigned int n_descs; 904 dma_addr_t dma_addr; 905 int wr_idx; 906 907 /* Reject if xdp_adjust_tail grow packet beyond DMA area */ 908 if (pkt_len + dma_off > dma_map_sz) 909 return false; 910 911 /* Make sure there's still at least one block available after 912 * aligning to block boundary, so that the txds used below 913 * won't wrap around the tx_ring. 914 */ 915 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 916 if (!*completed) { 917 nfp_nfdk_xdp_complete(tx_ring); 918 *completed = true; 919 } 920 921 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 922 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, 923 NULL); 924 return false; 925 } 926 } 927 928 /* Check if cross block boundary */ 929 n_descs = nfp_nfdk_headlen_to_segs(pkt_len); 930 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != 931 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) || 932 ((u32)tx_ring->data_pending + pkt_len > 933 NFDK_TX_MAX_DATA_PER_BLOCK)) { 934 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p); 935 936 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 937 txd = &tx_ring->ktxds[wr_idx]; 938 memset(txd, 0, 939 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); 940 941 tx_ring->data_pending = 0; 942 tx_ring->wr_p += nop_slots; 943 tx_ring->wr_ptr_add += nop_slots; 944 } 945 946 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 947 948 txbuf = &tx_ring->ktxbufs[wr_idx]; 949 950 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP; 951 txbuf[1].dma_addr = rxbuf->dma_addr; 952 /* Note: pkt len not stored */ 953 954 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, 955 pkt_len, DMA_BIDIRECTIONAL); 956 957 /* Build TX descriptor */ 958 txd = &tx_ring->ktxds[wr_idx]; 959 dma_len = pkt_len; 960 dma_addr = rxbuf->dma_addr + dma_off; 961 962 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD) 963 type = NFDK_DESC_TX_TYPE_SIMPLE; 964 else 965 type = NFDK_DESC_TX_TYPE_GATHER; 966 967 /* FIELD_PREP() implicitly truncates to chunk */ 968 dma_len -= 1; 969 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, 970 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ? 971 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) | 972 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); 973 974 txd->dma_len_type = cpu_to_le16(dlen_type); 975 nfp_desc_set_dma_addr_48b(txd, dma_addr); 976 977 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; 978 dma_len -= tmp_dlen; 979 dma_addr += tmp_dlen + 1; 980 txd++; 981 982 while (dma_len > 0) { 983 dma_len -= 1; 984 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); 985 txd->dma_len_type = cpu_to_le16(dlen_type); 986 nfp_desc_set_dma_addr_48b(txd, dma_addr); 987 988 dlen_type &= NFDK_DESC_TX_DMA_LEN; 989 dma_len -= dlen_type; 990 dma_addr += dlen_type + 1; 991 txd++; 992 } 993 994 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); 995 996 /* Metadata desc */ 997 txd->raw = 0; 998 txd++; 999 1000 cnt = txd - tx_ring->ktxds - wr_idx; 1001 tx_ring->wr_p += cnt; 1002 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 1003 tx_ring->data_pending += pkt_len; 1004 else 1005 tx_ring->data_pending = 0; 1006 1007 tx_ring->wr_ptr_add += cnt; 1008 return true; 1009 } 1010 1011 /** 1012 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring 1013 * @rx_ring: RX ring to receive from 1014 * @budget: NAPI budget 1015 * 1016 * Note, this function is separated out from the napi poll function to 1017 * more cleanly separate packet receive code from other bookkeeping 1018 * functions performed in the napi poll function. 1019 * 1020 * Return: Number of packets received. 1021 */ 1022 static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget) 1023 { 1024 struct nfp_net_r_vector *r_vec = rx_ring->r_vec; 1025 struct nfp_net_dp *dp = &r_vec->nfp_net->dp; 1026 struct nfp_net_tx_ring *tx_ring; 1027 struct bpf_prog *xdp_prog; 1028 bool xdp_tx_cmpl = false; 1029 unsigned int true_bufsz; 1030 struct sk_buff *skb; 1031 int pkts_polled = 0; 1032 struct xdp_buff xdp; 1033 int idx; 1034 1035 xdp_prog = READ_ONCE(dp->xdp_prog); 1036 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; 1037 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, 1038 &rx_ring->xdp_rxq); 1039 tx_ring = r_vec->xdp_ring; 1040 1041 while (pkts_polled < budget) { 1042 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 1043 struct nfp_net_rx_buf *rxbuf; 1044 struct nfp_net_rx_desc *rxd; 1045 struct nfp_meta_parsed meta; 1046 bool redir_egress = false; 1047 struct net_device *netdev; 1048 dma_addr_t new_dma_addr; 1049 u32 meta_len_xdp = 0; 1050 void *new_frag; 1051 1052 idx = D_IDX(rx_ring, rx_ring->rd_p); 1053 1054 rxd = &rx_ring->rxds[idx]; 1055 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 1056 break; 1057 1058 /* Memory barrier to ensure that we won't do other reads 1059 * before the DD bit. 1060 */ 1061 dma_rmb(); 1062 1063 memset(&meta, 0, sizeof(meta)); 1064 1065 rx_ring->rd_p++; 1066 pkts_polled++; 1067 1068 rxbuf = &rx_ring->rxbufs[idx]; 1069 /* < meta_len > 1070 * <-- [rx_offset] --> 1071 * --------------------------------------------------------- 1072 * | [XX] | metadata | packet | XXXX | 1073 * --------------------------------------------------------- 1074 * <---------------- data_len ---------------> 1075 * 1076 * The rx_offset is fixed for all packets, the meta_len can vary 1077 * on a packet by packet basis. If rx_offset is set to zero 1078 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the 1079 * buffer and is immediately followed by the packet (no [XX]). 1080 */ 1081 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 1082 data_len = le16_to_cpu(rxd->rxd.data_len); 1083 pkt_len = data_len - meta_len; 1084 1085 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 1086 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 1087 pkt_off += meta_len; 1088 else 1089 pkt_off += dp->rx_offset; 1090 meta_off = pkt_off - meta_len; 1091 1092 /* Stats update */ 1093 u64_stats_update_begin(&r_vec->rx_sync); 1094 r_vec->rx_pkts++; 1095 r_vec->rx_bytes += pkt_len; 1096 u64_stats_update_end(&r_vec->rx_sync); 1097 1098 if (unlikely(meta_len > NFP_NET_MAX_PREPEND || 1099 (dp->rx_offset && meta_len > dp->rx_offset))) { 1100 nn_dp_warn(dp, "oversized RX packet metadata %u\n", 1101 meta_len); 1102 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1103 continue; 1104 } 1105 1106 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, 1107 data_len); 1108 1109 if (meta_len) { 1110 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta, 1111 rxbuf->frag + meta_off, 1112 rxbuf->frag + pkt_off, 1113 pkt_len, meta_len))) { 1114 nn_dp_warn(dp, "invalid RX packet metadata\n"); 1115 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, 1116 NULL); 1117 continue; 1118 } 1119 } 1120 1121 if (xdp_prog && !meta.portid) { 1122 void *orig_data = rxbuf->frag + pkt_off; 1123 unsigned int dma_off; 1124 int act; 1125 1126 xdp_prepare_buff(&xdp, 1127 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, 1128 pkt_off - NFP_NET_RX_BUF_HEADROOM, 1129 pkt_len, true); 1130 1131 act = bpf_prog_run_xdp(xdp_prog, &xdp); 1132 1133 pkt_len = xdp.data_end - xdp.data; 1134 pkt_off += xdp.data - orig_data; 1135 1136 switch (act) { 1137 case XDP_PASS: 1138 meta_len_xdp = xdp.data - xdp.data_meta; 1139 break; 1140 case XDP_TX: 1141 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; 1142 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring, 1143 tx_ring, 1144 rxbuf, 1145 dma_off, 1146 pkt_len, 1147 &xdp_tx_cmpl))) 1148 trace_xdp_exception(dp->netdev, 1149 xdp_prog, act); 1150 continue; 1151 default: 1152 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act); 1153 fallthrough; 1154 case XDP_ABORTED: 1155 trace_xdp_exception(dp->netdev, xdp_prog, act); 1156 fallthrough; 1157 case XDP_DROP: 1158 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, 1159 rxbuf->dma_addr); 1160 continue; 1161 } 1162 } 1163 1164 if (likely(!meta.portid)) { 1165 netdev = dp->netdev; 1166 } else if (meta.portid == NFP_META_PORT_ID_CTRL) { 1167 struct nfp_net *nn = netdev_priv(dp->netdev); 1168 1169 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, 1170 pkt_len); 1171 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, 1172 rxbuf->dma_addr); 1173 continue; 1174 } else { 1175 struct nfp_net *nn; 1176 1177 nn = netdev_priv(dp->netdev); 1178 netdev = nfp_app_dev_get(nn->app, meta.portid, 1179 &redir_egress); 1180 if (unlikely(!netdev)) { 1181 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, 1182 NULL); 1183 continue; 1184 } 1185 1186 if (nfp_netdev_is_nfp_repr(netdev)) 1187 nfp_repr_inc_rx_stats(netdev, pkt_len); 1188 } 1189 1190 skb = build_skb(rxbuf->frag, true_bufsz); 1191 if (unlikely(!skb)) { 1192 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1193 continue; 1194 } 1195 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); 1196 if (unlikely(!new_frag)) { 1197 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1198 continue; 1199 } 1200 1201 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1202 1203 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1204 1205 skb_reserve(skb, pkt_off); 1206 skb_put(skb, pkt_len); 1207 1208 skb->mark = meta.mark; 1209 skb_set_hash(skb, meta.hash, meta.hash_type); 1210 1211 skb_record_rx_queue(skb, rx_ring->idx); 1212 skb->protocol = eth_type_trans(skb, netdev); 1213 1214 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb); 1215 1216 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) { 1217 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb); 1218 continue; 1219 } 1220 1221 #ifdef CONFIG_NFP_NET_IPSEC 1222 if (meta.ipsec_saidx != 0 && unlikely(nfp_net_ipsec_rx(&meta, skb))) { 1223 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb); 1224 continue; 1225 } 1226 #endif 1227 1228 if (meta_len_xdp) 1229 skb_metadata_set(skb, meta_len_xdp); 1230 1231 if (likely(!redir_egress)) { 1232 napi_gro_receive(&rx_ring->r_vec->napi, skb); 1233 } else { 1234 skb->dev = netdev; 1235 skb_reset_network_header(skb); 1236 __skb_push(skb, ETH_HLEN); 1237 dev_queue_xmit(skb); 1238 } 1239 } 1240 1241 if (xdp_prog) { 1242 if (tx_ring->wr_ptr_add) 1243 nfp_net_tx_xmit_more_flush(tx_ring); 1244 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && 1245 !xdp_tx_cmpl) 1246 if (!nfp_nfdk_xdp_complete(tx_ring)) 1247 pkts_polled = budget; 1248 } 1249 1250 return pkts_polled; 1251 } 1252 1253 /** 1254 * nfp_nfdk_poll() - napi poll function 1255 * @napi: NAPI structure 1256 * @budget: NAPI budget 1257 * 1258 * Return: number of packets polled. 1259 */ 1260 int nfp_nfdk_poll(struct napi_struct *napi, int budget) 1261 { 1262 struct nfp_net_r_vector *r_vec = 1263 container_of(napi, struct nfp_net_r_vector, napi); 1264 unsigned int pkts_polled = 0; 1265 1266 if (r_vec->tx_ring) 1267 nfp_nfdk_tx_complete(r_vec->tx_ring, budget); 1268 if (r_vec->rx_ring) 1269 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget); 1270 1271 if (pkts_polled < budget) 1272 if (napi_complete_done(napi, pkts_polled)) 1273 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1274 1275 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) { 1276 struct dim_sample dim_sample = {}; 1277 unsigned int start; 1278 u64 pkts, bytes; 1279 1280 do { 1281 start = u64_stats_fetch_begin(&r_vec->rx_sync); 1282 pkts = r_vec->rx_pkts; 1283 bytes = r_vec->rx_bytes; 1284 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); 1285 1286 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1287 net_dim(&r_vec->rx_dim, dim_sample); 1288 } 1289 1290 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) { 1291 struct dim_sample dim_sample = {}; 1292 unsigned int start; 1293 u64 pkts, bytes; 1294 1295 do { 1296 start = u64_stats_fetch_begin(&r_vec->tx_sync); 1297 pkts = r_vec->tx_pkts; 1298 bytes = r_vec->tx_bytes; 1299 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); 1300 1301 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); 1302 net_dim(&r_vec->tx_dim, dim_sample); 1303 } 1304 1305 return pkts_polled; 1306 } 1307 1308 /* Control device data path 1309 */ 1310 1311 bool 1312 nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, 1313 struct sk_buff *skb, bool old) 1314 { 1315 u32 cnt, tmp_dlen, dlen_type = 0; 1316 struct nfp_net_tx_ring *tx_ring; 1317 struct nfp_nfdk_tx_buf *txbuf; 1318 struct nfp_nfdk_tx_desc *txd; 1319 unsigned int dma_len, type; 1320 struct nfp_net_dp *dp; 1321 dma_addr_t dma_addr; 1322 u64 metadata = 0; 1323 int wr_idx; 1324 1325 dp = &r_vec->nfp_net->dp; 1326 tx_ring = r_vec->tx_ring; 1327 1328 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { 1329 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); 1330 goto err_free; 1331 } 1332 1333 /* Don't bother counting frags, assume the worst */ 1334 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { 1335 u64_stats_update_begin(&r_vec->tx_sync); 1336 r_vec->tx_busy++; 1337 u64_stats_update_end(&r_vec->tx_sync); 1338 if (!old) 1339 __skb_queue_tail(&r_vec->queue, skb); 1340 else 1341 __skb_queue_head(&r_vec->queue, skb); 1342 return NETDEV_TX_BUSY; 1343 } 1344 1345 if (nfp_app_ctrl_has_meta(nn->app)) { 1346 if (unlikely(skb_headroom(skb) < 8)) { 1347 nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); 1348 goto err_free; 1349 } 1350 metadata = NFDK_DESC_TX_CHAIN_META; 1351 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); 1352 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) | 1353 FIELD_PREP(NFDK_META_FIELDS, 1354 NFP_NET_META_PORTID), 1355 skb_push(skb, 4)); 1356 } 1357 1358 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb)) 1359 goto err_free; 1360 1361 /* DMA map all */ 1362 wr_idx = D_IDX(tx_ring, tx_ring->wr_p); 1363 txd = &tx_ring->ktxds[wr_idx]; 1364 txbuf = &tx_ring->ktxbufs[wr_idx]; 1365 1366 dma_len = skb_headlen(skb); 1367 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD) 1368 type = NFDK_DESC_TX_TYPE_SIMPLE; 1369 else 1370 type = NFDK_DESC_TX_TYPE_GATHER; 1371 1372 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); 1373 if (dma_mapping_error(dp->dev, dma_addr)) 1374 goto err_warn_dma; 1375 1376 txbuf->skb = skb; 1377 txbuf++; 1378 1379 txbuf->dma_addr = dma_addr; 1380 txbuf++; 1381 1382 dma_len -= 1; 1383 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, 1384 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ? 1385 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) | 1386 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); 1387 1388 txd->dma_len_type = cpu_to_le16(dlen_type); 1389 nfp_desc_set_dma_addr_48b(txd, dma_addr); 1390 1391 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; 1392 dma_len -= tmp_dlen; 1393 dma_addr += tmp_dlen + 1; 1394 txd++; 1395 1396 while (dma_len > 0) { 1397 dma_len -= 1; 1398 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); 1399 txd->dma_len_type = cpu_to_le16(dlen_type); 1400 nfp_desc_set_dma_addr_48b(txd, dma_addr); 1401 1402 dlen_type &= NFDK_DESC_TX_DMA_LEN; 1403 dma_len -= dlen_type; 1404 dma_addr += dlen_type + 1; 1405 txd++; 1406 } 1407 1408 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); 1409 1410 /* Metadata desc */ 1411 txd->raw = cpu_to_le64(metadata); 1412 txd++; 1413 1414 cnt = txd - tx_ring->ktxds - wr_idx; 1415 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != 1416 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) 1417 goto err_warn_overflow; 1418 1419 tx_ring->wr_p += cnt; 1420 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) 1421 tx_ring->data_pending += skb->len; 1422 else 1423 tx_ring->data_pending = 0; 1424 1425 tx_ring->wr_ptr_add += cnt; 1426 nfp_net_tx_xmit_more_flush(tx_ring); 1427 1428 return NETDEV_TX_OK; 1429 1430 err_warn_overflow: 1431 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", 1432 wr_idx, skb_headlen(skb), 0, cnt); 1433 txbuf--; 1434 dma_unmap_single(dp->dev, txbuf->dma_addr, 1435 skb_headlen(skb), DMA_TO_DEVICE); 1436 txbuf->raw = 0; 1437 err_warn_dma: 1438 nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); 1439 err_free: 1440 u64_stats_update_begin(&r_vec->tx_sync); 1441 r_vec->tx_errors++; 1442 u64_stats_update_end(&r_vec->tx_sync); 1443 dev_kfree_skb_any(skb); 1444 return NETDEV_TX_OK; 1445 } 1446 1447 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) 1448 { 1449 struct sk_buff *skb; 1450 1451 while ((skb = __skb_dequeue(&r_vec->queue))) 1452 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) 1453 return; 1454 } 1455 1456 static bool 1457 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) 1458 { 1459 u32 meta_type, meta_tag; 1460 1461 if (!nfp_app_ctrl_has_meta(nn->app)) 1462 return !meta_len; 1463 1464 if (meta_len != 8) 1465 return false; 1466 1467 meta_type = get_unaligned_be32(data); 1468 meta_tag = get_unaligned_be32(data + 4); 1469 1470 return (meta_type == NFP_NET_META_PORTID && 1471 meta_tag == NFP_META_PORT_ID_CTRL); 1472 } 1473 1474 static bool 1475 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, 1476 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) 1477 { 1478 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; 1479 struct nfp_net_rx_buf *rxbuf; 1480 struct nfp_net_rx_desc *rxd; 1481 dma_addr_t new_dma_addr; 1482 struct sk_buff *skb; 1483 void *new_frag; 1484 int idx; 1485 1486 idx = D_IDX(rx_ring, rx_ring->rd_p); 1487 1488 rxd = &rx_ring->rxds[idx]; 1489 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) 1490 return false; 1491 1492 /* Memory barrier to ensure that we won't do other reads 1493 * before the DD bit. 1494 */ 1495 dma_rmb(); 1496 1497 rx_ring->rd_p++; 1498 1499 rxbuf = &rx_ring->rxbufs[idx]; 1500 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; 1501 data_len = le16_to_cpu(rxd->rxd.data_len); 1502 pkt_len = data_len - meta_len; 1503 1504 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; 1505 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) 1506 pkt_off += meta_len; 1507 else 1508 pkt_off += dp->rx_offset; 1509 meta_off = pkt_off - meta_len; 1510 1511 /* Stats update */ 1512 u64_stats_update_begin(&r_vec->rx_sync); 1513 r_vec->rx_pkts++; 1514 r_vec->rx_bytes += pkt_len; 1515 u64_stats_update_end(&r_vec->rx_sync); 1516 1517 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); 1518 1519 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { 1520 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", 1521 meta_len); 1522 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1523 return true; 1524 } 1525 1526 skb = build_skb(rxbuf->frag, dp->fl_bufsz); 1527 if (unlikely(!skb)) { 1528 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); 1529 return true; 1530 } 1531 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); 1532 if (unlikely(!new_frag)) { 1533 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); 1534 return true; 1535 } 1536 1537 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); 1538 1539 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); 1540 1541 skb_reserve(skb, pkt_off); 1542 skb_put(skb, pkt_len); 1543 1544 nfp_app_ctrl_rx(nn->app, skb); 1545 1546 return true; 1547 } 1548 1549 static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) 1550 { 1551 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; 1552 struct nfp_net *nn = r_vec->nfp_net; 1553 struct nfp_net_dp *dp = &nn->dp; 1554 unsigned int budget = 512; 1555 1556 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) 1557 continue; 1558 1559 return budget; 1560 } 1561 1562 void nfp_nfdk_ctrl_poll(struct tasklet_struct *t) 1563 { 1564 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); 1565 1566 spin_lock(&r_vec->lock); 1567 nfp_nfdk_tx_complete(r_vec->tx_ring, 0); 1568 __nfp_ctrl_tx_queued(r_vec); 1569 spin_unlock(&r_vec->lock); 1570 1571 if (nfp_ctrl_rx(r_vec)) { 1572 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); 1573 } else { 1574 tasklet_schedule(&r_vec->tasklet); 1575 nn_dp_warn(&r_vec->nfp_net->dp, 1576 "control message budget exceeded!\n"); 1577 } 1578 } 1579