1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) Meta Platforms, Inc. and affiliates. */ 3 4 #include <linux/bitfield.h> 5 #include <linux/bpf.h> 6 #include <linux/bpf_trace.h> 7 #include <linux/iopoll.h> 8 #include <linux/pci.h> 9 #include <net/netdev_queues.h> 10 #include <net/page_pool/helpers.h> 11 #include <net/tcp.h> 12 #include <net/xdp.h> 13 14 #include "fbnic.h" 15 #include "fbnic_csr.h" 16 #include "fbnic_netdev.h" 17 #include "fbnic_txrx.h" 18 19 enum { 20 FBNIC_XDP_PASS = 0, 21 FBNIC_XDP_CONSUME, 22 FBNIC_XDP_TX, 23 FBNIC_XDP_LEN_ERR, 24 }; 25 26 enum { 27 FBNIC_XMIT_CB_TS = 0x01, 28 }; 29 30 struct fbnic_xmit_cb { 31 u32 bytecount; 32 u16 gso_segs; 33 u8 desc_count; 34 u8 flags; 35 int hw_head; 36 }; 37 38 #define FBNIC_XMIT_CB(__skb) ((struct fbnic_xmit_cb *)((__skb)->cb)) 39 40 static u32 __iomem *fbnic_ring_csr_base(const struct fbnic_ring *ring) 41 { 42 unsigned long csr_base = (unsigned long)ring->doorbell; 43 44 csr_base &= ~(FBNIC_QUEUE_STRIDE * sizeof(u32) - 1); 45 46 return (u32 __iomem *)csr_base; 47 } 48 49 static u32 fbnic_ring_rd32(struct fbnic_ring *ring, unsigned int csr) 50 { 51 u32 __iomem *csr_base = fbnic_ring_csr_base(ring); 52 53 return readl(csr_base + csr); 54 } 55 56 static void fbnic_ring_wr32(struct fbnic_ring *ring, unsigned int csr, u32 val) 57 { 58 u32 __iomem *csr_base = fbnic_ring_csr_base(ring); 59 60 writel(val, csr_base + csr); 61 } 62 63 /** 64 * fbnic_ts40_to_ns() - convert descriptor timestamp to PHC time 65 * @fbn: netdev priv of the FB NIC 66 * @ts40: timestamp read from a descriptor 67 * 68 * Return: u64 value of PHC time in nanoseconds 69 * 70 * Convert truncated 40 bit device timestamp as read from a descriptor 71 * to the full PHC time in nanoseconds. 72 */ 73 static __maybe_unused u64 fbnic_ts40_to_ns(struct fbnic_net *fbn, u64 ts40) 74 { 75 unsigned int s; 76 u64 time_ns; 77 s64 offset; 78 u8 ts_top; 79 u32 high; 80 81 do { 82 s = u64_stats_fetch_begin(&fbn->time_seq); 83 offset = READ_ONCE(fbn->time_offset); 84 } while (u64_stats_fetch_retry(&fbn->time_seq, s)); 85 86 high = READ_ONCE(fbn->time_high); 87 88 /* Bits 63..40 from periodic clock reads, 39..0 from ts40 */ 89 time_ns = (u64)(high >> 8) << 40 | ts40; 90 91 /* Compare bits 32-39 between periodic reads and ts40, 92 * see if HW clock may have wrapped since last read. We are sure 93 * that periodic reads are always at least ~1 minute behind, so 94 * this logic works perfectly fine. 95 */ 96 ts_top = ts40 >> 32; 97 if (ts_top < (u8)high && (u8)high - ts_top > U8_MAX / 2) 98 time_ns += 1ULL << 40; 99 100 return time_ns + offset; 101 } 102 103 static unsigned int fbnic_desc_unused(struct fbnic_ring *ring) 104 { 105 return (ring->head - ring->tail - 1) & ring->size_mask; 106 } 107 108 static unsigned int fbnic_desc_used(struct fbnic_ring *ring) 109 { 110 return (ring->tail - ring->head) & ring->size_mask; 111 } 112 113 static struct netdev_queue *txring_txq(const struct net_device *dev, 114 const struct fbnic_ring *ring) 115 { 116 return netdev_get_tx_queue(dev, ring->q_idx); 117 } 118 119 static int fbnic_maybe_stop_tx(const struct net_device *dev, 120 struct fbnic_ring *ring, 121 const unsigned int size) 122 { 123 struct netdev_queue *txq = txring_txq(dev, ring); 124 int res; 125 126 res = netif_txq_maybe_stop(txq, fbnic_desc_unused(ring), size, 127 FBNIC_TX_DESC_WAKEUP); 128 if (!res) { 129 u64_stats_update_begin(&ring->stats.syncp); 130 ring->stats.twq.stop++; 131 u64_stats_update_end(&ring->stats.syncp); 132 } 133 134 return !res; 135 } 136 137 static bool fbnic_tx_sent_queue(struct sk_buff *skb, struct fbnic_ring *ring) 138 { 139 struct netdev_queue *dev_queue = txring_txq(skb->dev, ring); 140 unsigned int bytecount = FBNIC_XMIT_CB(skb)->bytecount; 141 bool xmit_more = netdev_xmit_more(); 142 143 /* TBD: Request completion more often if xmit_more becomes large */ 144 145 return __netdev_tx_sent_queue(dev_queue, bytecount, xmit_more); 146 } 147 148 static void fbnic_unmap_single_twd(struct device *dev, __le64 *twd) 149 { 150 u64 raw_twd = le64_to_cpu(*twd); 151 unsigned int len; 152 dma_addr_t dma; 153 154 dma = FIELD_GET(FBNIC_TWD_ADDR_MASK, raw_twd); 155 len = FIELD_GET(FBNIC_TWD_LEN_MASK, raw_twd); 156 157 dma_unmap_single(dev, dma, len, DMA_TO_DEVICE); 158 } 159 160 static void fbnic_unmap_page_twd(struct device *dev, __le64 *twd) 161 { 162 u64 raw_twd = le64_to_cpu(*twd); 163 unsigned int len; 164 dma_addr_t dma; 165 166 dma = FIELD_GET(FBNIC_TWD_ADDR_MASK, raw_twd); 167 len = FIELD_GET(FBNIC_TWD_LEN_MASK, raw_twd); 168 169 dma_unmap_page(dev, dma, len, DMA_TO_DEVICE); 170 } 171 172 #define FBNIC_TWD_TYPE(_type) \ 173 cpu_to_le64(FIELD_PREP(FBNIC_TWD_TYPE_MASK, FBNIC_TWD_TYPE_##_type)) 174 175 static bool fbnic_tx_tstamp(struct sk_buff *skb) 176 { 177 struct fbnic_net *fbn; 178 179 if (!unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) 180 return false; 181 182 fbn = netdev_priv(skb->dev); 183 if (fbn->hwtstamp_config.tx_type == HWTSTAMP_TX_OFF) 184 return false; 185 186 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 187 FBNIC_XMIT_CB(skb)->flags |= FBNIC_XMIT_CB_TS; 188 FBNIC_XMIT_CB(skb)->hw_head = -1; 189 190 return true; 191 } 192 193 static bool 194 fbnic_tx_lso(struct fbnic_ring *ring, struct sk_buff *skb, 195 struct skb_shared_info *shinfo, __le64 *meta, 196 unsigned int *l2len, unsigned int *i3len) 197 { 198 unsigned int l3_type, l4_type, l4len, hdrlen; 199 unsigned char *l4hdr; 200 __be16 payload_len; 201 202 if (unlikely(skb_cow_head(skb, 0))) 203 return true; 204 205 if (shinfo->gso_type & SKB_GSO_PARTIAL) { 206 l3_type = FBNIC_TWD_L3_TYPE_OTHER; 207 } else if (!skb->encapsulation) { 208 if (ip_hdr(skb)->version == 4) 209 l3_type = FBNIC_TWD_L3_TYPE_IPV4; 210 else 211 l3_type = FBNIC_TWD_L3_TYPE_IPV6; 212 } else { 213 unsigned int o3len; 214 215 o3len = skb_inner_network_header(skb) - skb_network_header(skb); 216 *i3len -= o3len; 217 *meta |= cpu_to_le64(FIELD_PREP(FBNIC_TWD_L3_OHLEN_MASK, 218 o3len / 2)); 219 l3_type = FBNIC_TWD_L3_TYPE_V6V6; 220 } 221 222 l4hdr = skb_checksum_start(skb); 223 payload_len = cpu_to_be16(skb->len - (l4hdr - skb->data)); 224 225 if (shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) { 226 struct tcphdr *tcph = (struct tcphdr *)l4hdr; 227 228 l4_type = FBNIC_TWD_L4_TYPE_TCP; 229 l4len = __tcp_hdrlen((struct tcphdr *)l4hdr); 230 csum_replace_by_diff(&tcph->check, (__force __wsum)payload_len); 231 } else { 232 struct udphdr *udph = (struct udphdr *)l4hdr; 233 234 l4_type = FBNIC_TWD_L4_TYPE_UDP; 235 l4len = sizeof(struct udphdr); 236 csum_replace_by_diff(&udph->check, (__force __wsum)payload_len); 237 } 238 239 hdrlen = (l4hdr - skb->data) + l4len; 240 *meta |= cpu_to_le64(FIELD_PREP(FBNIC_TWD_L3_TYPE_MASK, l3_type) | 241 FIELD_PREP(FBNIC_TWD_L4_TYPE_MASK, l4_type) | 242 FIELD_PREP(FBNIC_TWD_L4_HLEN_MASK, l4len / 4) | 243 FIELD_PREP(FBNIC_TWD_MSS_MASK, shinfo->gso_size) | 244 FBNIC_TWD_FLAG_REQ_LSO); 245 246 FBNIC_XMIT_CB(skb)->bytecount += (shinfo->gso_segs - 1) * hdrlen; 247 FBNIC_XMIT_CB(skb)->gso_segs = shinfo->gso_segs; 248 249 u64_stats_update_begin(&ring->stats.syncp); 250 ring->stats.twq.lso += shinfo->gso_segs; 251 u64_stats_update_end(&ring->stats.syncp); 252 253 return false; 254 } 255 256 static bool 257 fbnic_tx_offloads(struct fbnic_ring *ring, struct sk_buff *skb, __le64 *meta) 258 { 259 struct skb_shared_info *shinfo = skb_shinfo(skb); 260 unsigned int l2len, i3len; 261 262 if (fbnic_tx_tstamp(skb)) 263 *meta |= cpu_to_le64(FBNIC_TWD_FLAG_REQ_TS); 264 265 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) 266 return false; 267 268 l2len = skb_mac_header_len(skb); 269 i3len = skb_checksum_start(skb) - skb_network_header(skb); 270 271 *meta |= cpu_to_le64(FIELD_PREP(FBNIC_TWD_CSUM_OFFSET_MASK, 272 skb->csum_offset / 2)); 273 274 if (shinfo->gso_size) { 275 if (fbnic_tx_lso(ring, skb, shinfo, meta, &l2len, &i3len)) 276 return true; 277 } else { 278 *meta |= cpu_to_le64(FBNIC_TWD_FLAG_REQ_CSO); 279 u64_stats_update_begin(&ring->stats.syncp); 280 ring->stats.twq.csum_partial++; 281 u64_stats_update_end(&ring->stats.syncp); 282 } 283 284 *meta |= cpu_to_le64(FIELD_PREP(FBNIC_TWD_L2_HLEN_MASK, l2len / 2) | 285 FIELD_PREP(FBNIC_TWD_L3_IHLEN_MASK, i3len / 2)); 286 return false; 287 } 288 289 static void 290 fbnic_rx_csum(u64 rcd, struct sk_buff *skb, struct fbnic_ring *rcq, 291 u64 *csum_cmpl, u64 *csum_none) 292 { 293 skb_checksum_none_assert(skb); 294 295 if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) { 296 (*csum_none)++; 297 return; 298 } 299 300 if (FIELD_GET(FBNIC_RCD_META_L4_CSUM_UNNECESSARY, rcd)) { 301 skb->ip_summed = CHECKSUM_UNNECESSARY; 302 } else { 303 u16 csum = FIELD_GET(FBNIC_RCD_META_L2_CSUM_MASK, rcd); 304 305 skb->ip_summed = CHECKSUM_COMPLETE; 306 skb->csum = (__force __wsum)csum; 307 (*csum_cmpl)++; 308 } 309 } 310 311 static bool 312 fbnic_tx_map(struct fbnic_ring *ring, struct sk_buff *skb, __le64 *meta) 313 { 314 struct device *dev = skb->dev->dev.parent; 315 unsigned int tail = ring->tail, first; 316 unsigned int size, data_len; 317 skb_frag_t *frag; 318 dma_addr_t dma; 319 __le64 *twd; 320 321 ring->tx_buf[tail] = skb; 322 323 tail++; 324 tail &= ring->size_mask; 325 first = tail; 326 327 size = skb_headlen(skb); 328 data_len = skb->data_len; 329 330 if (size > FIELD_MAX(FBNIC_TWD_LEN_MASK)) 331 goto dma_error; 332 333 dma = dma_map_single(dev, skb->data, size, DMA_TO_DEVICE); 334 335 for (frag = &skb_shinfo(skb)->frags[0];; frag++) { 336 twd = &ring->desc[tail]; 337 338 if (dma_mapping_error(dev, dma)) 339 goto dma_error; 340 341 *twd = cpu_to_le64(FIELD_PREP(FBNIC_TWD_ADDR_MASK, dma) | 342 FIELD_PREP(FBNIC_TWD_LEN_MASK, size) | 343 FIELD_PREP(FBNIC_TWD_TYPE_MASK, 344 FBNIC_TWD_TYPE_AL)); 345 346 tail++; 347 tail &= ring->size_mask; 348 349 if (!data_len) 350 break; 351 352 size = skb_frag_size(frag); 353 data_len -= size; 354 355 if (size > FIELD_MAX(FBNIC_TWD_LEN_MASK)) 356 goto dma_error; 357 358 dma = skb_frag_dma_map(dev, frag, 0, size, DMA_TO_DEVICE); 359 } 360 361 *twd |= FBNIC_TWD_TYPE(LAST_AL); 362 363 FBNIC_XMIT_CB(skb)->desc_count = ((twd - meta) + 1) & ring->size_mask; 364 365 ring->tail = tail; 366 367 /* Record SW timestamp */ 368 skb_tx_timestamp(skb); 369 370 /* Verify there is room for another packet */ 371 fbnic_maybe_stop_tx(skb->dev, ring, FBNIC_MAX_SKB_DESC); 372 373 if (fbnic_tx_sent_queue(skb, ring)) { 374 *meta |= cpu_to_le64(FBNIC_TWD_FLAG_REQ_COMPLETION); 375 376 /* Force DMA writes to flush before writing to tail */ 377 dma_wmb(); 378 379 writel(tail, ring->doorbell); 380 } 381 382 return false; 383 dma_error: 384 if (net_ratelimit()) 385 netdev_err(skb->dev, "TX DMA map failed\n"); 386 387 while (tail != first) { 388 tail--; 389 tail &= ring->size_mask; 390 twd = &ring->desc[tail]; 391 if (tail == first) 392 fbnic_unmap_single_twd(dev, twd); 393 else 394 fbnic_unmap_page_twd(dev, twd); 395 } 396 397 return true; 398 } 399 400 #define FBNIC_MIN_FRAME_LEN 60 401 402 static netdev_tx_t 403 fbnic_xmit_frame_ring(struct sk_buff *skb, struct fbnic_ring *ring) 404 { 405 __le64 *meta = &ring->desc[ring->tail]; 406 u16 desc_needed; 407 408 if (skb_put_padto(skb, FBNIC_MIN_FRAME_LEN)) 409 goto err_count; 410 411 /* Need: 1 descriptor per page, 412 * + 1 desc for skb_head, 413 * + 2 desc for metadata and timestamp metadata 414 * + 7 desc gap to keep tail from touching head 415 * otherwise try next time 416 */ 417 desc_needed = skb_shinfo(skb)->nr_frags + 10; 418 if (fbnic_maybe_stop_tx(skb->dev, ring, desc_needed)) 419 return NETDEV_TX_BUSY; 420 421 *meta = cpu_to_le64(FBNIC_TWD_FLAG_DEST_MAC); 422 423 /* Write all members within DWORD to condense this into 2 4B writes */ 424 FBNIC_XMIT_CB(skb)->bytecount = skb->len; 425 FBNIC_XMIT_CB(skb)->gso_segs = 1; 426 FBNIC_XMIT_CB(skb)->desc_count = 0; 427 FBNIC_XMIT_CB(skb)->flags = 0; 428 429 if (fbnic_tx_offloads(ring, skb, meta)) 430 goto err_free; 431 432 if (fbnic_tx_map(ring, skb, meta)) 433 goto err_free; 434 435 return NETDEV_TX_OK; 436 437 err_free: 438 dev_kfree_skb_any(skb); 439 err_count: 440 u64_stats_update_begin(&ring->stats.syncp); 441 ring->stats.dropped++; 442 u64_stats_update_end(&ring->stats.syncp); 443 return NETDEV_TX_OK; 444 } 445 446 netdev_tx_t fbnic_xmit_frame(struct sk_buff *skb, struct net_device *dev) 447 { 448 struct fbnic_net *fbn = netdev_priv(dev); 449 unsigned int q_map = skb->queue_mapping; 450 451 return fbnic_xmit_frame_ring(skb, fbn->tx[q_map]); 452 } 453 454 static netdev_features_t 455 fbnic_features_check_encap_gso(struct sk_buff *skb, struct net_device *dev, 456 netdev_features_t features, unsigned int l3len) 457 { 458 netdev_features_t skb_gso_features; 459 struct ipv6hdr *ip6_hdr; 460 unsigned char l4_hdr; 461 unsigned int start; 462 __be16 frag_off; 463 464 /* Require MANGLEID for GSO_PARTIAL of IPv4. 465 * In theory we could support TSO with single, innermost v4 header 466 * by pretending everything before it is L2, but that needs to be 467 * parsed case by case.. so leaving it for when the need arises. 468 */ 469 if (!(features & NETIF_F_TSO_MANGLEID)) 470 features &= ~NETIF_F_TSO; 471 472 skb_gso_features = skb_shinfo(skb)->gso_type; 473 skb_gso_features <<= NETIF_F_GSO_SHIFT; 474 475 /* We'd only clear the native GSO features, so don't bother validating 476 * if the match can only be on those supported thru GSO_PARTIAL. 477 */ 478 if (!(skb_gso_features & FBNIC_TUN_GSO_FEATURES)) 479 return features; 480 481 /* We can only do IPv6-in-IPv6, not v4-in-v6. It'd be nice 482 * to fall back to partial for this, or any failure below. 483 * This is just an optimization, UDPv4 will be caught later on. 484 */ 485 if (skb_gso_features & NETIF_F_TSO) 486 return features & ~FBNIC_TUN_GSO_FEATURES; 487 488 /* Inner headers multiple of 2 */ 489 if ((skb_inner_network_header(skb) - skb_network_header(skb)) % 2) 490 return features & ~FBNIC_TUN_GSO_FEATURES; 491 492 /* Encapsulated GSO packet, make 100% sure it's IPv6-in-IPv6. */ 493 ip6_hdr = ipv6_hdr(skb); 494 if (ip6_hdr->version != 6) 495 return features & ~FBNIC_TUN_GSO_FEATURES; 496 497 l4_hdr = ip6_hdr->nexthdr; 498 start = (unsigned char *)ip6_hdr - skb->data + sizeof(struct ipv6hdr); 499 start = ipv6_skip_exthdr(skb, start, &l4_hdr, &frag_off); 500 if (frag_off || l4_hdr != IPPROTO_IPV6 || 501 skb->data + start != skb_inner_network_header(skb)) 502 return features & ~FBNIC_TUN_GSO_FEATURES; 503 504 return features; 505 } 506 507 netdev_features_t 508 fbnic_features_check(struct sk_buff *skb, struct net_device *dev, 509 netdev_features_t features) 510 { 511 unsigned int l2len, l3len; 512 513 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) 514 return features; 515 516 l2len = skb_mac_header_len(skb); 517 l3len = skb_checksum_start(skb) - skb_network_header(skb); 518 519 /* Check header lengths are multiple of 2. 520 * In case of 6in6 we support longer headers (IHLEN + OHLEN) 521 * but keep things simple for now, 512B is plenty. 522 */ 523 if ((l2len | l3len | skb->csum_offset) % 2 || 524 !FIELD_FIT(FBNIC_TWD_L2_HLEN_MASK, l2len / 2) || 525 !FIELD_FIT(FBNIC_TWD_L3_IHLEN_MASK, l3len / 2) || 526 !FIELD_FIT(FBNIC_TWD_CSUM_OFFSET_MASK, skb->csum_offset / 2)) 527 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 528 529 if (likely(!skb->encapsulation) || !skb_is_gso(skb)) 530 return features; 531 532 return fbnic_features_check_encap_gso(skb, dev, features, l3len); 533 } 534 535 static void fbnic_clean_twq0(struct fbnic_napi_vector *nv, int napi_budget, 536 struct fbnic_ring *ring, bool discard, 537 unsigned int hw_head) 538 { 539 u64 total_bytes = 0, total_packets = 0, ts_lost = 0; 540 unsigned int head = ring->head; 541 struct netdev_queue *txq; 542 unsigned int clean_desc; 543 544 clean_desc = (hw_head - head) & ring->size_mask; 545 546 while (clean_desc) { 547 struct sk_buff *skb = ring->tx_buf[head]; 548 unsigned int desc_cnt; 549 550 desc_cnt = FBNIC_XMIT_CB(skb)->desc_count; 551 if (desc_cnt > clean_desc) 552 break; 553 554 if (unlikely(FBNIC_XMIT_CB(skb)->flags & FBNIC_XMIT_CB_TS)) { 555 FBNIC_XMIT_CB(skb)->hw_head = hw_head; 556 if (likely(!discard)) 557 break; 558 ts_lost++; 559 } 560 561 ring->tx_buf[head] = NULL; 562 563 clean_desc -= desc_cnt; 564 565 while (!(ring->desc[head] & FBNIC_TWD_TYPE(AL))) { 566 head++; 567 head &= ring->size_mask; 568 desc_cnt--; 569 } 570 571 fbnic_unmap_single_twd(nv->dev, &ring->desc[head]); 572 head++; 573 head &= ring->size_mask; 574 desc_cnt--; 575 576 while (desc_cnt--) { 577 fbnic_unmap_page_twd(nv->dev, &ring->desc[head]); 578 head++; 579 head &= ring->size_mask; 580 } 581 582 total_bytes += FBNIC_XMIT_CB(skb)->bytecount; 583 total_packets += FBNIC_XMIT_CB(skb)->gso_segs; 584 585 napi_consume_skb(skb, napi_budget); 586 } 587 588 if (!total_bytes) 589 return; 590 591 ring->head = head; 592 593 txq = txring_txq(nv->napi.dev, ring); 594 595 if (unlikely(discard)) { 596 u64_stats_update_begin(&ring->stats.syncp); 597 ring->stats.dropped += total_packets; 598 ring->stats.twq.ts_lost += ts_lost; 599 u64_stats_update_end(&ring->stats.syncp); 600 601 netdev_tx_completed_queue(txq, total_packets, total_bytes); 602 return; 603 } 604 605 u64_stats_update_begin(&ring->stats.syncp); 606 ring->stats.bytes += total_bytes; 607 ring->stats.packets += total_packets; 608 u64_stats_update_end(&ring->stats.syncp); 609 610 if (!netif_txq_completed_wake(txq, total_packets, total_bytes, 611 fbnic_desc_unused(ring), 612 FBNIC_TX_DESC_WAKEUP)) { 613 u64_stats_update_begin(&ring->stats.syncp); 614 ring->stats.twq.wake++; 615 u64_stats_update_end(&ring->stats.syncp); 616 } 617 } 618 619 static void fbnic_clean_twq1(struct fbnic_napi_vector *nv, bool pp_allow_direct, 620 struct fbnic_ring *ring, bool discard, 621 unsigned int hw_head) 622 { 623 u64 total_bytes = 0, total_packets = 0; 624 unsigned int head = ring->head; 625 626 while (hw_head != head) { 627 struct page *page; 628 u64 twd; 629 630 if (unlikely(!(ring->desc[head] & FBNIC_TWD_TYPE(AL)))) 631 goto next_desc; 632 633 twd = le64_to_cpu(ring->desc[head]); 634 page = ring->tx_buf[head]; 635 636 /* TYPE_AL is 2, TYPE_LAST_AL is 3. So this trick gives 637 * us one increment per packet, with no branches. 638 */ 639 total_packets += FIELD_GET(FBNIC_TWD_TYPE_MASK, twd) - 640 FBNIC_TWD_TYPE_AL; 641 total_bytes += FIELD_GET(FBNIC_TWD_LEN_MASK, twd); 642 643 page_pool_put_page(page->pp, page, -1, pp_allow_direct); 644 next_desc: 645 head++; 646 head &= ring->size_mask; 647 } 648 649 if (!total_bytes) 650 return; 651 652 ring->head = head; 653 654 if (discard) { 655 u64_stats_update_begin(&ring->stats.syncp); 656 ring->stats.dropped += total_packets; 657 u64_stats_update_end(&ring->stats.syncp); 658 return; 659 } 660 661 u64_stats_update_begin(&ring->stats.syncp); 662 ring->stats.bytes += total_bytes; 663 ring->stats.packets += total_packets; 664 u64_stats_update_end(&ring->stats.syncp); 665 } 666 667 static void fbnic_clean_tsq(struct fbnic_napi_vector *nv, 668 struct fbnic_ring *ring, 669 u64 tcd, int *ts_head, int *head0) 670 { 671 struct skb_shared_hwtstamps hwtstamp; 672 struct fbnic_net *fbn; 673 struct sk_buff *skb; 674 int head; 675 u64 ns; 676 677 head = (*ts_head < 0) ? ring->head : *ts_head; 678 679 do { 680 unsigned int desc_cnt; 681 682 if (head == ring->tail) { 683 if (unlikely(net_ratelimit())) 684 netdev_err(nv->napi.dev, 685 "Tx timestamp without matching packet\n"); 686 return; 687 } 688 689 skb = ring->tx_buf[head]; 690 desc_cnt = FBNIC_XMIT_CB(skb)->desc_count; 691 692 head += desc_cnt; 693 head &= ring->size_mask; 694 } while (!(FBNIC_XMIT_CB(skb)->flags & FBNIC_XMIT_CB_TS)); 695 696 fbn = netdev_priv(nv->napi.dev); 697 ns = fbnic_ts40_to_ns(fbn, FIELD_GET(FBNIC_TCD_TYPE1_TS_MASK, tcd)); 698 699 memset(&hwtstamp, 0, sizeof(hwtstamp)); 700 hwtstamp.hwtstamp = ns_to_ktime(ns); 701 702 *ts_head = head; 703 704 FBNIC_XMIT_CB(skb)->flags &= ~FBNIC_XMIT_CB_TS; 705 if (*head0 < 0) { 706 head = FBNIC_XMIT_CB(skb)->hw_head; 707 if (head >= 0) 708 *head0 = head; 709 } 710 711 skb_tstamp_tx(skb, &hwtstamp); 712 u64_stats_update_begin(&ring->stats.syncp); 713 ring->stats.twq.ts_packets++; 714 u64_stats_update_end(&ring->stats.syncp); 715 } 716 717 static void fbnic_page_pool_init(struct fbnic_ring *ring, unsigned int idx, 718 netmem_ref netmem) 719 { 720 struct fbnic_rx_buf *rx_buf = &ring->rx_buf[idx]; 721 722 page_pool_fragment_netmem(netmem, FBNIC_PAGECNT_BIAS_MAX); 723 rx_buf->pagecnt_bias = FBNIC_PAGECNT_BIAS_MAX; 724 rx_buf->netmem = netmem; 725 } 726 727 static struct page * 728 fbnic_page_pool_get_head(struct fbnic_q_triad *qt, unsigned int idx) 729 { 730 struct fbnic_rx_buf *rx_buf = &qt->sub0.rx_buf[idx]; 731 732 rx_buf->pagecnt_bias--; 733 734 /* sub0 is always fed system pages, from the NAPI-level page_pool */ 735 return netmem_to_page(rx_buf->netmem); 736 } 737 738 static netmem_ref 739 fbnic_page_pool_get_data(struct fbnic_q_triad *qt, unsigned int idx) 740 { 741 struct fbnic_rx_buf *rx_buf = &qt->sub1.rx_buf[idx]; 742 743 rx_buf->pagecnt_bias--; 744 745 return rx_buf->netmem; 746 } 747 748 static void fbnic_page_pool_drain(struct fbnic_ring *ring, unsigned int idx, 749 int budget) 750 { 751 struct fbnic_rx_buf *rx_buf = &ring->rx_buf[idx]; 752 netmem_ref netmem = rx_buf->netmem; 753 754 if (!page_pool_unref_netmem(netmem, rx_buf->pagecnt_bias)) 755 page_pool_put_unrefed_netmem(ring->page_pool, netmem, -1, 756 !!budget); 757 758 rx_buf->netmem = 0; 759 } 760 761 static void fbnic_clean_twq(struct fbnic_napi_vector *nv, int napi_budget, 762 struct fbnic_q_triad *qt, s32 ts_head, s32 head0, 763 s32 head1) 764 { 765 if (head0 >= 0) 766 fbnic_clean_twq0(nv, napi_budget, &qt->sub0, false, head0); 767 else if (ts_head >= 0) 768 fbnic_clean_twq0(nv, napi_budget, &qt->sub0, false, ts_head); 769 770 if (head1 >= 0) { 771 qt->cmpl.deferred_head = -1; 772 if (napi_budget) 773 fbnic_clean_twq1(nv, true, &qt->sub1, false, head1); 774 else 775 qt->cmpl.deferred_head = head1; 776 } 777 } 778 779 static void 780 fbnic_clean_tcq(struct fbnic_napi_vector *nv, struct fbnic_q_triad *qt, 781 int napi_budget) 782 { 783 struct fbnic_ring *cmpl = &qt->cmpl; 784 s32 head1 = cmpl->deferred_head; 785 s32 head0 = -1, ts_head = -1; 786 __le64 *raw_tcd, done; 787 u32 head = cmpl->head; 788 789 done = (head & (cmpl->size_mask + 1)) ? 0 : cpu_to_le64(FBNIC_TCD_DONE); 790 raw_tcd = &cmpl->desc[head & cmpl->size_mask]; 791 792 /* Walk the completion queue collecting the heads reported by NIC */ 793 while ((*raw_tcd & cpu_to_le64(FBNIC_TCD_DONE)) == done) { 794 u64 tcd; 795 796 dma_rmb(); 797 798 tcd = le64_to_cpu(*raw_tcd); 799 800 switch (FIELD_GET(FBNIC_TCD_TYPE_MASK, tcd)) { 801 case FBNIC_TCD_TYPE_0: 802 if (tcd & FBNIC_TCD_TWQ1) 803 head1 = FIELD_GET(FBNIC_TCD_TYPE0_HEAD1_MASK, 804 tcd); 805 else 806 head0 = FIELD_GET(FBNIC_TCD_TYPE0_HEAD0_MASK, 807 tcd); 808 /* Currently all err status bits are related to 809 * timestamps and as those have yet to be added 810 * they are skipped for now. 811 */ 812 break; 813 case FBNIC_TCD_TYPE_1: 814 if (WARN_ON_ONCE(tcd & FBNIC_TCD_TWQ1)) 815 break; 816 817 fbnic_clean_tsq(nv, &qt->sub0, tcd, &ts_head, &head0); 818 break; 819 default: 820 break; 821 } 822 823 raw_tcd++; 824 head++; 825 if (!(head & cmpl->size_mask)) { 826 done ^= cpu_to_le64(FBNIC_TCD_DONE); 827 raw_tcd = &cmpl->desc[0]; 828 } 829 } 830 831 /* Record the current head/tail of the queue */ 832 if (cmpl->head != head) { 833 cmpl->head = head; 834 writel(head & cmpl->size_mask, cmpl->doorbell); 835 } 836 837 /* Unmap and free processed buffers */ 838 fbnic_clean_twq(nv, napi_budget, qt, ts_head, head0, head1); 839 } 840 841 static void fbnic_clean_bdq(struct fbnic_ring *ring, unsigned int hw_head, 842 int napi_budget) 843 { 844 unsigned int head = ring->head; 845 846 if (head == hw_head) 847 return; 848 849 do { 850 fbnic_page_pool_drain(ring, head, napi_budget); 851 852 head++; 853 head &= ring->size_mask; 854 } while (head != hw_head); 855 856 ring->head = head; 857 } 858 859 static void fbnic_bd_prep(struct fbnic_ring *bdq, u16 id, netmem_ref netmem) 860 { 861 __le64 *bdq_desc = &bdq->desc[id * FBNIC_BD_FRAG_COUNT]; 862 dma_addr_t dma = page_pool_get_dma_addr_netmem(netmem); 863 u64 bd, i = FBNIC_BD_FRAG_COUNT; 864 865 bd = (FBNIC_BD_PAGE_ADDR_MASK & dma) | 866 FIELD_PREP(FBNIC_BD_PAGE_ID_MASK, id); 867 868 /* In the case that a page size is larger than 4K we will map a 869 * single page to multiple fragments. The fragments will be 870 * FBNIC_BD_FRAG_COUNT in size and the lower n bits will be use 871 * to indicate the individual fragment IDs. 872 */ 873 do { 874 *bdq_desc = cpu_to_le64(bd); 875 bd += FIELD_PREP(FBNIC_BD_DESC_ADDR_MASK, 1) | 876 FIELD_PREP(FBNIC_BD_DESC_ID_MASK, 1); 877 } while (--i); 878 } 879 880 static void fbnic_fill_bdq(struct fbnic_ring *bdq) 881 { 882 unsigned int count = fbnic_desc_unused(bdq); 883 unsigned int i = bdq->tail; 884 885 if (!count) 886 return; 887 888 do { 889 netmem_ref netmem; 890 891 netmem = page_pool_dev_alloc_netmems(bdq->page_pool); 892 if (!netmem) { 893 u64_stats_update_begin(&bdq->stats.syncp); 894 bdq->stats.rx.alloc_failed++; 895 u64_stats_update_end(&bdq->stats.syncp); 896 897 break; 898 } 899 900 fbnic_page_pool_init(bdq, i, netmem); 901 fbnic_bd_prep(bdq, i, netmem); 902 903 i++; 904 i &= bdq->size_mask; 905 906 count--; 907 } while (count); 908 909 if (bdq->tail != i) { 910 bdq->tail = i; 911 912 /* Force DMA writes to flush before writing to tail */ 913 dma_wmb(); 914 915 writel(i, bdq->doorbell); 916 } 917 } 918 919 static unsigned int fbnic_hdr_pg_start(unsigned int pg_off) 920 { 921 /* The headroom of the first header may be larger than FBNIC_RX_HROOM 922 * due to alignment. So account for that by just making the page 923 * offset 0 if we are starting at the first header. 924 */ 925 if (ALIGN(FBNIC_RX_HROOM, 128) > FBNIC_RX_HROOM && 926 pg_off == ALIGN(FBNIC_RX_HROOM, 128)) 927 return 0; 928 929 return pg_off - FBNIC_RX_HROOM; 930 } 931 932 static unsigned int fbnic_hdr_pg_end(unsigned int pg_off, unsigned int len) 933 { 934 /* Determine the end of the buffer by finding the start of the next 935 * and then subtracting the headroom from that frame. 936 */ 937 pg_off += len + FBNIC_RX_TROOM + FBNIC_RX_HROOM; 938 939 return ALIGN(pg_off, 128) - FBNIC_RX_HROOM; 940 } 941 942 static void fbnic_pkt_prepare(struct fbnic_napi_vector *nv, u64 rcd, 943 struct fbnic_pkt_buff *pkt, 944 struct fbnic_q_triad *qt) 945 { 946 unsigned int hdr_pg_idx = FIELD_GET(FBNIC_RCD_AL_BUFF_PAGE_MASK, rcd); 947 unsigned int hdr_pg_off = FIELD_GET(FBNIC_RCD_AL_BUFF_OFF_MASK, rcd); 948 struct page *page = fbnic_page_pool_get_head(qt, hdr_pg_idx); 949 unsigned int len = FIELD_GET(FBNIC_RCD_AL_BUFF_LEN_MASK, rcd); 950 unsigned int frame_sz, hdr_pg_start, hdr_pg_end, headroom; 951 unsigned char *hdr_start; 952 953 /* data_hard_start should always be NULL when this is called */ 954 WARN_ON_ONCE(pkt->buff.data_hard_start); 955 956 /* Short-cut the end calculation if we know page is fully consumed */ 957 hdr_pg_end = FIELD_GET(FBNIC_RCD_AL_PAGE_FIN, rcd) ? 958 FBNIC_BD_FRAG_SIZE : fbnic_hdr_pg_end(hdr_pg_off, len); 959 hdr_pg_start = fbnic_hdr_pg_start(hdr_pg_off); 960 961 headroom = hdr_pg_off - hdr_pg_start + FBNIC_RX_PAD; 962 frame_sz = hdr_pg_end - hdr_pg_start; 963 xdp_init_buff(&pkt->buff, frame_sz, &qt->xdp_rxq); 964 hdr_pg_start += (FBNIC_RCD_AL_BUFF_FRAG_MASK & rcd) * 965 FBNIC_BD_FRAG_SIZE; 966 967 /* Sync DMA buffer */ 968 dma_sync_single_range_for_cpu(nv->dev, page_pool_get_dma_addr(page), 969 hdr_pg_start, frame_sz, 970 DMA_BIDIRECTIONAL); 971 972 /* Build frame around buffer */ 973 hdr_start = page_address(page) + hdr_pg_start; 974 net_prefetch(pkt->buff.data); 975 xdp_prepare_buff(&pkt->buff, hdr_start, headroom, 976 len - FBNIC_RX_PAD, true); 977 978 pkt->hwtstamp = 0; 979 pkt->add_frag_failed = false; 980 } 981 982 static void fbnic_add_rx_frag(struct fbnic_napi_vector *nv, u64 rcd, 983 struct fbnic_pkt_buff *pkt, 984 struct fbnic_q_triad *qt) 985 { 986 unsigned int pg_idx = FIELD_GET(FBNIC_RCD_AL_BUFF_PAGE_MASK, rcd); 987 unsigned int pg_off = FIELD_GET(FBNIC_RCD_AL_BUFF_OFF_MASK, rcd); 988 unsigned int len = FIELD_GET(FBNIC_RCD_AL_BUFF_LEN_MASK, rcd); 989 netmem_ref netmem = fbnic_page_pool_get_data(qt, pg_idx); 990 unsigned int truesize; 991 bool added; 992 993 truesize = FIELD_GET(FBNIC_RCD_AL_PAGE_FIN, rcd) ? 994 FBNIC_BD_FRAG_SIZE - pg_off : ALIGN(len, 128); 995 996 pg_off += (FBNIC_RCD_AL_BUFF_FRAG_MASK & rcd) * 997 FBNIC_BD_FRAG_SIZE; 998 999 /* Sync DMA buffer */ 1000 dma_sync_single_range_for_cpu(nv->dev, 1001 page_pool_get_dma_addr_netmem(netmem), 1002 pg_off, truesize, DMA_BIDIRECTIONAL); 1003 1004 added = xdp_buff_add_frag(&pkt->buff, netmem, pg_off, len, truesize); 1005 if (unlikely(!added)) { 1006 pkt->add_frag_failed = true; 1007 netdev_err_once(nv->napi.dev, 1008 "Failed to add fragment to xdp_buff\n"); 1009 } 1010 } 1011 1012 static void fbnic_put_pkt_buff(struct fbnic_q_triad *qt, 1013 struct fbnic_pkt_buff *pkt, int budget) 1014 { 1015 struct page *page; 1016 1017 if (!pkt->buff.data_hard_start) 1018 return; 1019 1020 if (xdp_buff_has_frags(&pkt->buff)) { 1021 struct skb_shared_info *shinfo; 1022 netmem_ref netmem; 1023 int nr_frags; 1024 1025 shinfo = xdp_get_shared_info_from_buff(&pkt->buff); 1026 nr_frags = shinfo->nr_frags; 1027 1028 while (nr_frags--) { 1029 netmem = skb_frag_netmem(&shinfo->frags[nr_frags]); 1030 page_pool_put_full_netmem(qt->sub1.page_pool, netmem, 1031 !!budget); 1032 } 1033 } 1034 1035 page = virt_to_page(pkt->buff.data_hard_start); 1036 page_pool_put_full_page(qt->sub0.page_pool, page, !!budget); 1037 } 1038 1039 static struct sk_buff *fbnic_build_skb(struct fbnic_napi_vector *nv, 1040 struct fbnic_pkt_buff *pkt) 1041 { 1042 struct sk_buff *skb; 1043 1044 skb = xdp_build_skb_from_buff(&pkt->buff); 1045 if (!skb) 1046 return NULL; 1047 1048 /* Add timestamp if present */ 1049 if (pkt->hwtstamp) 1050 skb_hwtstamps(skb)->hwtstamp = pkt->hwtstamp; 1051 1052 return skb; 1053 } 1054 1055 static long fbnic_pkt_tx(struct fbnic_napi_vector *nv, 1056 struct fbnic_pkt_buff *pkt) 1057 { 1058 struct fbnic_ring *ring = &nv->qt[0].sub1; 1059 int size, offset, nsegs = 1, data_len = 0; 1060 unsigned int tail = ring->tail; 1061 struct skb_shared_info *shinfo; 1062 skb_frag_t *frag = NULL; 1063 struct page *page; 1064 dma_addr_t dma; 1065 __le64 *twd; 1066 1067 if (unlikely(xdp_buff_has_frags(&pkt->buff))) { 1068 shinfo = xdp_get_shared_info_from_buff(&pkt->buff); 1069 nsegs += shinfo->nr_frags; 1070 data_len = shinfo->xdp_frags_size; 1071 frag = &shinfo->frags[0]; 1072 } 1073 1074 if (fbnic_desc_unused(ring) < nsegs) { 1075 u64_stats_update_begin(&ring->stats.syncp); 1076 ring->stats.dropped++; 1077 u64_stats_update_end(&ring->stats.syncp); 1078 return -FBNIC_XDP_CONSUME; 1079 } 1080 1081 page = virt_to_page(pkt->buff.data_hard_start); 1082 offset = offset_in_page(pkt->buff.data); 1083 dma = page_pool_get_dma_addr(page); 1084 1085 size = pkt->buff.data_end - pkt->buff.data; 1086 1087 while (nsegs--) { 1088 dma_sync_single_range_for_device(nv->dev, dma, offset, size, 1089 DMA_BIDIRECTIONAL); 1090 dma += offset; 1091 1092 ring->tx_buf[tail] = page; 1093 1094 twd = &ring->desc[tail]; 1095 *twd = cpu_to_le64(FIELD_PREP(FBNIC_TWD_ADDR_MASK, dma) | 1096 FIELD_PREP(FBNIC_TWD_LEN_MASK, size) | 1097 FIELD_PREP(FBNIC_TWD_TYPE_MASK, 1098 FBNIC_TWD_TYPE_AL)); 1099 1100 tail++; 1101 tail &= ring->size_mask; 1102 1103 if (!data_len) 1104 break; 1105 1106 offset = skb_frag_off(frag); 1107 page = skb_frag_page(frag); 1108 dma = page_pool_get_dma_addr(page); 1109 1110 size = skb_frag_size(frag); 1111 data_len -= size; 1112 frag++; 1113 } 1114 1115 *twd |= FBNIC_TWD_TYPE(LAST_AL); 1116 1117 ring->tail = tail; 1118 1119 return -FBNIC_XDP_TX; 1120 } 1121 1122 static void fbnic_pkt_commit_tail(struct fbnic_napi_vector *nv, 1123 unsigned int pkt_tail) 1124 { 1125 struct fbnic_ring *ring = &nv->qt[0].sub1; 1126 1127 /* Force DMA writes to flush before writing to tail */ 1128 dma_wmb(); 1129 1130 writel(pkt_tail, ring->doorbell); 1131 } 1132 1133 static struct sk_buff *fbnic_run_xdp(struct fbnic_napi_vector *nv, 1134 struct fbnic_pkt_buff *pkt) 1135 { 1136 struct fbnic_net *fbn = netdev_priv(nv->napi.dev); 1137 struct bpf_prog *xdp_prog; 1138 int act; 1139 1140 xdp_prog = READ_ONCE(fbn->xdp_prog); 1141 if (!xdp_prog) 1142 goto xdp_pass; 1143 1144 /* Should never happen, config paths enforce HDS threshold > MTU */ 1145 if (xdp_buff_has_frags(&pkt->buff) && !xdp_prog->aux->xdp_has_frags) 1146 return ERR_PTR(-FBNIC_XDP_LEN_ERR); 1147 1148 act = bpf_prog_run_xdp(xdp_prog, &pkt->buff); 1149 switch (act) { 1150 case XDP_PASS: 1151 xdp_pass: 1152 return fbnic_build_skb(nv, pkt); 1153 case XDP_TX: 1154 return ERR_PTR(fbnic_pkt_tx(nv, pkt)); 1155 default: 1156 bpf_warn_invalid_xdp_action(nv->napi.dev, xdp_prog, act); 1157 fallthrough; 1158 case XDP_ABORTED: 1159 trace_xdp_exception(nv->napi.dev, xdp_prog, act); 1160 fallthrough; 1161 case XDP_DROP: 1162 break; 1163 } 1164 1165 return ERR_PTR(-FBNIC_XDP_CONSUME); 1166 } 1167 1168 static enum pkt_hash_types fbnic_skb_hash_type(u64 rcd) 1169 { 1170 return (FBNIC_RCD_META_L4_TYPE_MASK & rcd) ? PKT_HASH_TYPE_L4 : 1171 (FBNIC_RCD_META_L3_TYPE_MASK & rcd) ? PKT_HASH_TYPE_L3 : 1172 PKT_HASH_TYPE_L2; 1173 } 1174 1175 static void fbnic_rx_tstamp(struct fbnic_napi_vector *nv, u64 rcd, 1176 struct fbnic_pkt_buff *pkt) 1177 { 1178 struct fbnic_net *fbn; 1179 u64 ns, ts; 1180 1181 if (!FIELD_GET(FBNIC_RCD_OPT_META_TS, rcd)) 1182 return; 1183 1184 fbn = netdev_priv(nv->napi.dev); 1185 ts = FIELD_GET(FBNIC_RCD_OPT_META_TS_MASK, rcd); 1186 ns = fbnic_ts40_to_ns(fbn, ts); 1187 1188 /* Add timestamp to shared info */ 1189 pkt->hwtstamp = ns_to_ktime(ns); 1190 } 1191 1192 static void fbnic_populate_skb_fields(struct fbnic_napi_vector *nv, 1193 u64 rcd, struct sk_buff *skb, 1194 struct fbnic_q_triad *qt, 1195 u64 *csum_cmpl, u64 *csum_none) 1196 { 1197 struct net_device *netdev = nv->napi.dev; 1198 struct fbnic_ring *rcq = &qt->cmpl; 1199 1200 fbnic_rx_csum(rcd, skb, rcq, csum_cmpl, csum_none); 1201 1202 if (netdev->features & NETIF_F_RXHASH) 1203 skb_set_hash(skb, 1204 FIELD_GET(FBNIC_RCD_META_RSS_HASH_MASK, rcd), 1205 fbnic_skb_hash_type(rcd)); 1206 1207 skb_record_rx_queue(skb, rcq->q_idx); 1208 } 1209 1210 static bool fbnic_rcd_metadata_err(u64 rcd) 1211 { 1212 return !!(FBNIC_RCD_META_UNCORRECTABLE_ERR_MASK & rcd); 1213 } 1214 1215 static int fbnic_clean_rcq(struct fbnic_napi_vector *nv, 1216 struct fbnic_q_triad *qt, int budget) 1217 { 1218 unsigned int packets = 0, bytes = 0, dropped = 0, alloc_failed = 0; 1219 u64 csum_complete = 0, csum_none = 0, length_errors = 0; 1220 s32 head0 = -1, head1 = -1, pkt_tail = -1; 1221 struct fbnic_ring *rcq = &qt->cmpl; 1222 struct fbnic_pkt_buff *pkt; 1223 __le64 *raw_rcd, done; 1224 u32 head = rcq->head; 1225 1226 done = (head & (rcq->size_mask + 1)) ? cpu_to_le64(FBNIC_RCD_DONE) : 0; 1227 raw_rcd = &rcq->desc[head & rcq->size_mask]; 1228 pkt = rcq->pkt; 1229 1230 /* Walk the completion queue collecting the heads reported by NIC */ 1231 while (likely(packets < budget)) { 1232 struct sk_buff *skb = ERR_PTR(-EINVAL); 1233 u64 rcd; 1234 1235 if ((*raw_rcd & cpu_to_le64(FBNIC_RCD_DONE)) == done) 1236 break; 1237 1238 dma_rmb(); 1239 1240 rcd = le64_to_cpu(*raw_rcd); 1241 1242 switch (FIELD_GET(FBNIC_RCD_TYPE_MASK, rcd)) { 1243 case FBNIC_RCD_TYPE_HDR_AL: 1244 head0 = FIELD_GET(FBNIC_RCD_AL_BUFF_PAGE_MASK, rcd); 1245 fbnic_pkt_prepare(nv, rcd, pkt, qt); 1246 1247 break; 1248 case FBNIC_RCD_TYPE_PAY_AL: 1249 head1 = FIELD_GET(FBNIC_RCD_AL_BUFF_PAGE_MASK, rcd); 1250 fbnic_add_rx_frag(nv, rcd, pkt, qt); 1251 1252 break; 1253 case FBNIC_RCD_TYPE_OPT_META: 1254 /* Only type 0 is currently supported */ 1255 if (FIELD_GET(FBNIC_RCD_OPT_META_TYPE_MASK, rcd)) 1256 break; 1257 1258 fbnic_rx_tstamp(nv, rcd, pkt); 1259 1260 /* We currently ignore the action table index */ 1261 break; 1262 case FBNIC_RCD_TYPE_META: 1263 if (unlikely(pkt->add_frag_failed)) 1264 skb = NULL; 1265 else if (likely(!fbnic_rcd_metadata_err(rcd))) 1266 skb = fbnic_run_xdp(nv, pkt); 1267 1268 /* Populate skb and invalidate XDP */ 1269 if (!IS_ERR_OR_NULL(skb)) { 1270 fbnic_populate_skb_fields(nv, rcd, skb, qt, 1271 &csum_complete, 1272 &csum_none); 1273 1274 packets++; 1275 bytes += skb->len; 1276 1277 napi_gro_receive(&nv->napi, skb); 1278 } else if (skb == ERR_PTR(-FBNIC_XDP_TX)) { 1279 pkt_tail = nv->qt[0].sub1.tail; 1280 bytes += xdp_get_buff_len(&pkt->buff); 1281 } else { 1282 if (!skb) { 1283 alloc_failed++; 1284 dropped++; 1285 } else if (skb == ERR_PTR(-FBNIC_XDP_LEN_ERR)) { 1286 length_errors++; 1287 } else { 1288 dropped++; 1289 } 1290 1291 fbnic_put_pkt_buff(qt, pkt, 1); 1292 } 1293 1294 pkt->buff.data_hard_start = NULL; 1295 1296 break; 1297 } 1298 1299 raw_rcd++; 1300 head++; 1301 if (!(head & rcq->size_mask)) { 1302 done ^= cpu_to_le64(FBNIC_RCD_DONE); 1303 raw_rcd = &rcq->desc[0]; 1304 } 1305 } 1306 1307 u64_stats_update_begin(&rcq->stats.syncp); 1308 rcq->stats.packets += packets; 1309 rcq->stats.bytes += bytes; 1310 /* Re-add ethernet header length (removed in fbnic_build_skb) */ 1311 rcq->stats.bytes += ETH_HLEN * packets; 1312 rcq->stats.dropped += dropped; 1313 rcq->stats.rx.alloc_failed += alloc_failed; 1314 rcq->stats.rx.csum_complete += csum_complete; 1315 rcq->stats.rx.csum_none += csum_none; 1316 rcq->stats.rx.length_errors += length_errors; 1317 u64_stats_update_end(&rcq->stats.syncp); 1318 1319 if (pkt_tail >= 0) 1320 fbnic_pkt_commit_tail(nv, pkt_tail); 1321 1322 /* Unmap and free processed buffers */ 1323 if (head0 >= 0) 1324 fbnic_clean_bdq(&qt->sub0, head0, budget); 1325 fbnic_fill_bdq(&qt->sub0); 1326 1327 if (head1 >= 0) 1328 fbnic_clean_bdq(&qt->sub1, head1, budget); 1329 fbnic_fill_bdq(&qt->sub1); 1330 1331 /* Record the current head/tail of the queue */ 1332 if (rcq->head != head) { 1333 rcq->head = head; 1334 writel(head & rcq->size_mask, rcq->doorbell); 1335 } 1336 1337 return packets; 1338 } 1339 1340 static void fbnic_nv_irq_disable(struct fbnic_napi_vector *nv) 1341 { 1342 struct fbnic_dev *fbd = nv->fbd; 1343 u32 v_idx = nv->v_idx; 1344 1345 fbnic_wr32(fbd, FBNIC_INTR_MASK_SET(v_idx / 32), 1 << (v_idx % 32)); 1346 } 1347 1348 static void fbnic_nv_irq_rearm(struct fbnic_napi_vector *nv) 1349 { 1350 struct fbnic_dev *fbd = nv->fbd; 1351 u32 v_idx = nv->v_idx; 1352 1353 fbnic_wr32(fbd, FBNIC_INTR_CQ_REARM(v_idx), 1354 FBNIC_INTR_CQ_REARM_INTR_UNMASK); 1355 } 1356 1357 static int fbnic_poll(struct napi_struct *napi, int budget) 1358 { 1359 struct fbnic_napi_vector *nv = container_of(napi, 1360 struct fbnic_napi_vector, 1361 napi); 1362 int i, j, work_done = 0; 1363 1364 for (i = 0; i < nv->txt_count; i++) 1365 fbnic_clean_tcq(nv, &nv->qt[i], budget); 1366 1367 for (j = 0; j < nv->rxt_count; j++, i++) 1368 work_done += fbnic_clean_rcq(nv, &nv->qt[i], budget); 1369 1370 if (work_done >= budget) 1371 return budget; 1372 1373 if (likely(napi_complete_done(napi, work_done))) 1374 fbnic_nv_irq_rearm(nv); 1375 1376 return work_done; 1377 } 1378 1379 irqreturn_t fbnic_msix_clean_rings(int __always_unused irq, void *data) 1380 { 1381 struct fbnic_napi_vector *nv = *(void **)data; 1382 1383 napi_schedule_irqoff(&nv->napi); 1384 1385 return IRQ_HANDLED; 1386 } 1387 1388 void fbnic_aggregate_ring_rx_counters(struct fbnic_net *fbn, 1389 struct fbnic_ring *rxr) 1390 { 1391 struct fbnic_queue_stats *stats = &rxr->stats; 1392 1393 /* Capture stats from queues before dissasociating them */ 1394 fbn->rx_stats.bytes += stats->bytes; 1395 fbn->rx_stats.packets += stats->packets; 1396 fbn->rx_stats.dropped += stats->dropped; 1397 fbn->rx_stats.rx.alloc_failed += stats->rx.alloc_failed; 1398 fbn->rx_stats.rx.csum_complete += stats->rx.csum_complete; 1399 fbn->rx_stats.rx.csum_none += stats->rx.csum_none; 1400 fbn->rx_stats.rx.length_errors += stats->rx.length_errors; 1401 /* Remember to add new stats here */ 1402 BUILD_BUG_ON(sizeof(fbn->rx_stats.rx) / 8 != 4); 1403 } 1404 1405 void fbnic_aggregate_ring_tx_counters(struct fbnic_net *fbn, 1406 struct fbnic_ring *txr) 1407 { 1408 struct fbnic_queue_stats *stats = &txr->stats; 1409 1410 /* Capture stats from queues before dissasociating them */ 1411 fbn->tx_stats.bytes += stats->bytes; 1412 fbn->tx_stats.packets += stats->packets; 1413 fbn->tx_stats.dropped += stats->dropped; 1414 fbn->tx_stats.twq.csum_partial += stats->twq.csum_partial; 1415 fbn->tx_stats.twq.lso += stats->twq.lso; 1416 fbn->tx_stats.twq.ts_lost += stats->twq.ts_lost; 1417 fbn->tx_stats.twq.ts_packets += stats->twq.ts_packets; 1418 fbn->tx_stats.twq.stop += stats->twq.stop; 1419 fbn->tx_stats.twq.wake += stats->twq.wake; 1420 /* Remember to add new stats here */ 1421 BUILD_BUG_ON(sizeof(fbn->tx_stats.twq) / 8 != 6); 1422 } 1423 1424 static void fbnic_aggregate_ring_xdp_counters(struct fbnic_net *fbn, 1425 struct fbnic_ring *xdpr) 1426 { 1427 struct fbnic_queue_stats *stats = &xdpr->stats; 1428 1429 if (!(xdpr->flags & FBNIC_RING_F_STATS)) 1430 return; 1431 1432 /* Capture stats from queues before dissasociating them */ 1433 fbn->rx_stats.bytes += stats->bytes; 1434 fbn->rx_stats.packets += stats->packets; 1435 fbn->rx_stats.dropped += stats->dropped; 1436 fbn->tx_stats.bytes += stats->bytes; 1437 fbn->tx_stats.packets += stats->packets; 1438 } 1439 1440 static void fbnic_remove_tx_ring(struct fbnic_net *fbn, 1441 struct fbnic_ring *txr) 1442 { 1443 if (!(txr->flags & FBNIC_RING_F_STATS)) 1444 return; 1445 1446 fbnic_aggregate_ring_tx_counters(fbn, txr); 1447 1448 /* Remove pointer to the Tx ring */ 1449 WARN_ON(fbn->tx[txr->q_idx] && fbn->tx[txr->q_idx] != txr); 1450 fbn->tx[txr->q_idx] = NULL; 1451 } 1452 1453 static void fbnic_remove_xdp_ring(struct fbnic_net *fbn, 1454 struct fbnic_ring *xdpr) 1455 { 1456 if (!(xdpr->flags & FBNIC_RING_F_STATS)) 1457 return; 1458 1459 fbnic_aggregate_ring_xdp_counters(fbn, xdpr); 1460 1461 /* Remove pointer to the Tx ring */ 1462 WARN_ON(fbn->tx[xdpr->q_idx] && fbn->tx[xdpr->q_idx] != xdpr); 1463 fbn->tx[xdpr->q_idx] = NULL; 1464 } 1465 1466 static void fbnic_remove_rx_ring(struct fbnic_net *fbn, 1467 struct fbnic_ring *rxr) 1468 { 1469 if (!(rxr->flags & FBNIC_RING_F_STATS)) 1470 return; 1471 1472 fbnic_aggregate_ring_rx_counters(fbn, rxr); 1473 1474 /* Remove pointer to the Rx ring */ 1475 WARN_ON(fbn->rx[rxr->q_idx] && fbn->rx[rxr->q_idx] != rxr); 1476 fbn->rx[rxr->q_idx] = NULL; 1477 } 1478 1479 static void fbnic_free_qt_page_pools(struct fbnic_q_triad *qt) 1480 { 1481 page_pool_destroy(qt->sub0.page_pool); 1482 page_pool_destroy(qt->sub1.page_pool); 1483 } 1484 1485 static void fbnic_free_napi_vector(struct fbnic_net *fbn, 1486 struct fbnic_napi_vector *nv) 1487 { 1488 struct fbnic_dev *fbd = nv->fbd; 1489 int i, j; 1490 1491 for (i = 0; i < nv->txt_count; i++) { 1492 fbnic_remove_tx_ring(fbn, &nv->qt[i].sub0); 1493 fbnic_remove_xdp_ring(fbn, &nv->qt[i].sub1); 1494 fbnic_remove_tx_ring(fbn, &nv->qt[i].cmpl); 1495 } 1496 1497 for (j = 0; j < nv->rxt_count; j++, i++) { 1498 fbnic_remove_rx_ring(fbn, &nv->qt[i].sub0); 1499 fbnic_remove_rx_ring(fbn, &nv->qt[i].sub1); 1500 fbnic_remove_rx_ring(fbn, &nv->qt[i].cmpl); 1501 } 1502 1503 fbnic_napi_free_irq(fbd, nv); 1504 netif_napi_del_locked(&nv->napi); 1505 fbn->napi[fbnic_napi_idx(nv)] = NULL; 1506 kfree(nv); 1507 } 1508 1509 void fbnic_free_napi_vectors(struct fbnic_net *fbn) 1510 { 1511 int i; 1512 1513 for (i = 0; i < fbn->num_napi; i++) 1514 if (fbn->napi[i]) 1515 fbnic_free_napi_vector(fbn, fbn->napi[i]); 1516 } 1517 1518 #define FBNIC_PAGE_POOL_FLAGS \ 1519 (PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV) 1520 1521 static int 1522 fbnic_alloc_qt_page_pools(struct fbnic_net *fbn, struct fbnic_napi_vector *nv, 1523 struct fbnic_q_triad *qt) 1524 { 1525 struct page_pool_params pp_params = { 1526 .order = 0, 1527 .flags = FBNIC_PAGE_POOL_FLAGS, 1528 .pool_size = fbn->hpq_size + fbn->ppq_size, 1529 .nid = NUMA_NO_NODE, 1530 .dev = nv->dev, 1531 .dma_dir = DMA_BIDIRECTIONAL, 1532 .offset = 0, 1533 .max_len = PAGE_SIZE, 1534 .napi = &nv->napi, 1535 .netdev = fbn->netdev, 1536 }; 1537 struct page_pool *pp; 1538 1539 /* Page pool cannot exceed a size of 32768. This doesn't limit the 1540 * pages on the ring but the number we can have cached waiting on 1541 * the next use. 1542 * 1543 * TBD: Can this be reduced further? Would a multiple of 1544 * NAPI_POLL_WEIGHT possibly make more sense? The question is how 1545 * may pages do we need to hold in reserve to get the best return 1546 * without hogging too much system memory. 1547 */ 1548 if (pp_params.pool_size > 32768) 1549 pp_params.pool_size = 32768; 1550 1551 pp = page_pool_create(&pp_params); 1552 if (IS_ERR(pp)) 1553 return PTR_ERR(pp); 1554 1555 qt->sub0.page_pool = pp; 1556 page_pool_get(pp); 1557 qt->sub1.page_pool = pp; 1558 1559 return 0; 1560 } 1561 1562 static void fbnic_ring_init(struct fbnic_ring *ring, u32 __iomem *doorbell, 1563 int q_idx, u8 flags) 1564 { 1565 u64_stats_init(&ring->stats.syncp); 1566 ring->doorbell = doorbell; 1567 ring->q_idx = q_idx; 1568 ring->flags = flags; 1569 ring->deferred_head = -1; 1570 } 1571 1572 static int fbnic_alloc_napi_vector(struct fbnic_dev *fbd, struct fbnic_net *fbn, 1573 unsigned int v_count, unsigned int v_idx, 1574 unsigned int txq_count, unsigned int txq_idx, 1575 unsigned int rxq_count, unsigned int rxq_idx) 1576 { 1577 int txt_count = txq_count, rxt_count = rxq_count; 1578 u32 __iomem *uc_addr = fbd->uc_addr0; 1579 int xdp_count = 0, qt_count, err; 1580 struct fbnic_napi_vector *nv; 1581 struct fbnic_q_triad *qt; 1582 u32 __iomem *db; 1583 1584 /* We need to reserve at least one Tx Queue Triad for an XDP ring */ 1585 if (rxq_count) { 1586 xdp_count = 1; 1587 if (!txt_count) 1588 txt_count = 1; 1589 } 1590 1591 qt_count = txt_count + rxq_count; 1592 if (!qt_count) 1593 return -EINVAL; 1594 1595 /* If MMIO has already failed there are no rings to initialize */ 1596 if (!uc_addr) 1597 return -EIO; 1598 1599 /* Allocate NAPI vector and queue triads */ 1600 nv = kzalloc(struct_size(nv, qt, qt_count), GFP_KERNEL); 1601 if (!nv) 1602 return -ENOMEM; 1603 1604 /* Record queue triad counts */ 1605 nv->txt_count = txt_count; 1606 nv->rxt_count = rxt_count; 1607 1608 /* Provide pointer back to fbnic and MSI-X vectors */ 1609 nv->fbd = fbd; 1610 nv->v_idx = v_idx; 1611 1612 /* Tie napi to netdev */ 1613 fbn->napi[fbnic_napi_idx(nv)] = nv; 1614 netif_napi_add_locked(fbn->netdev, &nv->napi, fbnic_poll); 1615 1616 /* Record IRQ to NAPI struct */ 1617 netif_napi_set_irq_locked(&nv->napi, 1618 pci_irq_vector(to_pci_dev(fbd->dev), 1619 nv->v_idx)); 1620 1621 /* Tie nv back to PCIe dev */ 1622 nv->dev = fbd->dev; 1623 1624 /* Request the IRQ for napi vector */ 1625 err = fbnic_napi_request_irq(fbd, nv); 1626 if (err) 1627 goto napi_del; 1628 1629 /* Initialize queue triads */ 1630 qt = nv->qt; 1631 1632 while (txt_count) { 1633 u8 flags = FBNIC_RING_F_CTX | FBNIC_RING_F_STATS; 1634 1635 /* Configure Tx queue */ 1636 db = &uc_addr[FBNIC_QUEUE(txq_idx) + FBNIC_QUEUE_TWQ0_TAIL]; 1637 1638 /* Assign Tx queue to netdev if applicable */ 1639 if (txq_count > 0) { 1640 1641 fbnic_ring_init(&qt->sub0, db, txq_idx, flags); 1642 fbn->tx[txq_idx] = &qt->sub0; 1643 txq_count--; 1644 } else { 1645 fbnic_ring_init(&qt->sub0, db, 0, 1646 FBNIC_RING_F_DISABLED); 1647 } 1648 1649 /* Configure XDP queue */ 1650 db = &uc_addr[FBNIC_QUEUE(txq_idx) + FBNIC_QUEUE_TWQ1_TAIL]; 1651 1652 /* Assign XDP queue to netdev if applicable 1653 * 1654 * The setup for this is in itself a bit different. 1655 * 1. We only need one XDP Tx queue per NAPI vector. 1656 * 2. We associate it to the first Rx queue index. 1657 * 3. The hardware side is associated based on the Tx Queue. 1658 * 4. The netdev queue is offset by FBNIC_MAX_TXQs. 1659 */ 1660 if (xdp_count > 0) { 1661 unsigned int xdp_idx = FBNIC_MAX_TXQS + rxq_idx; 1662 1663 fbnic_ring_init(&qt->sub1, db, xdp_idx, flags); 1664 fbn->tx[xdp_idx] = &qt->sub1; 1665 xdp_count--; 1666 } else { 1667 fbnic_ring_init(&qt->sub1, db, 0, 1668 FBNIC_RING_F_DISABLED); 1669 } 1670 1671 /* Configure Tx completion queue */ 1672 db = &uc_addr[FBNIC_QUEUE(txq_idx) + FBNIC_QUEUE_TCQ_HEAD]; 1673 fbnic_ring_init(&qt->cmpl, db, 0, 0); 1674 1675 /* Update Tx queue index */ 1676 txt_count--; 1677 txq_idx += v_count; 1678 1679 /* Move to next queue triad */ 1680 qt++; 1681 } 1682 1683 while (rxt_count) { 1684 /* Configure header queue */ 1685 db = &uc_addr[FBNIC_QUEUE(rxq_idx) + FBNIC_QUEUE_BDQ_HPQ_TAIL]; 1686 fbnic_ring_init(&qt->sub0, db, 0, FBNIC_RING_F_CTX); 1687 1688 /* Configure payload queue */ 1689 db = &uc_addr[FBNIC_QUEUE(rxq_idx) + FBNIC_QUEUE_BDQ_PPQ_TAIL]; 1690 fbnic_ring_init(&qt->sub1, db, 0, FBNIC_RING_F_CTX); 1691 1692 /* Configure Rx completion queue */ 1693 db = &uc_addr[FBNIC_QUEUE(rxq_idx) + FBNIC_QUEUE_RCQ_HEAD]; 1694 fbnic_ring_init(&qt->cmpl, db, rxq_idx, FBNIC_RING_F_STATS); 1695 fbn->rx[rxq_idx] = &qt->cmpl; 1696 1697 /* Update Rx queue index */ 1698 rxt_count--; 1699 rxq_idx += v_count; 1700 1701 /* Move to next queue triad */ 1702 qt++; 1703 } 1704 1705 return 0; 1706 1707 napi_del: 1708 netif_napi_del_locked(&nv->napi); 1709 fbn->napi[fbnic_napi_idx(nv)] = NULL; 1710 kfree(nv); 1711 return err; 1712 } 1713 1714 int fbnic_alloc_napi_vectors(struct fbnic_net *fbn) 1715 { 1716 unsigned int txq_idx = 0, rxq_idx = 0, v_idx = FBNIC_NON_NAPI_VECTORS; 1717 unsigned int num_tx = fbn->num_tx_queues; 1718 unsigned int num_rx = fbn->num_rx_queues; 1719 unsigned int num_napi = fbn->num_napi; 1720 struct fbnic_dev *fbd = fbn->fbd; 1721 int err; 1722 1723 /* Allocate 1 Tx queue per napi vector */ 1724 if (num_napi < FBNIC_MAX_TXQS && num_napi == num_tx + num_rx) { 1725 while (num_tx) { 1726 err = fbnic_alloc_napi_vector(fbd, fbn, 1727 num_napi, v_idx, 1728 1, txq_idx, 0, 0); 1729 if (err) 1730 goto free_vectors; 1731 1732 /* Update counts and index */ 1733 num_tx--; 1734 txq_idx++; 1735 1736 v_idx++; 1737 } 1738 } 1739 1740 /* Allocate Tx/Rx queue pairs per vector, or allocate remaining Rx */ 1741 while (num_rx | num_tx) { 1742 int tqpv = DIV_ROUND_UP(num_tx, num_napi - txq_idx); 1743 int rqpv = DIV_ROUND_UP(num_rx, num_napi - rxq_idx); 1744 1745 err = fbnic_alloc_napi_vector(fbd, fbn, num_napi, v_idx, 1746 tqpv, txq_idx, rqpv, rxq_idx); 1747 if (err) 1748 goto free_vectors; 1749 1750 /* Update counts and index */ 1751 num_tx -= tqpv; 1752 txq_idx++; 1753 1754 num_rx -= rqpv; 1755 rxq_idx++; 1756 1757 v_idx++; 1758 } 1759 1760 return 0; 1761 1762 free_vectors: 1763 fbnic_free_napi_vectors(fbn); 1764 1765 return -ENOMEM; 1766 } 1767 1768 static void fbnic_free_ring_resources(struct device *dev, 1769 struct fbnic_ring *ring) 1770 { 1771 kvfree(ring->buffer); 1772 ring->buffer = NULL; 1773 1774 /* If size is not set there are no descriptors present */ 1775 if (!ring->size) 1776 return; 1777 1778 dma_free_coherent(dev, ring->size, ring->desc, ring->dma); 1779 ring->size_mask = 0; 1780 ring->size = 0; 1781 } 1782 1783 static int fbnic_alloc_tx_ring_desc(struct fbnic_net *fbn, 1784 struct fbnic_ring *txr) 1785 { 1786 struct device *dev = fbn->netdev->dev.parent; 1787 size_t size; 1788 1789 /* Round size up to nearest 4K */ 1790 size = ALIGN(array_size(sizeof(*txr->desc), fbn->txq_size), 4096); 1791 1792 txr->desc = dma_alloc_coherent(dev, size, &txr->dma, 1793 GFP_KERNEL | __GFP_NOWARN); 1794 if (!txr->desc) 1795 return -ENOMEM; 1796 1797 /* txq_size should be a power of 2, so mask is just that -1 */ 1798 txr->size_mask = fbn->txq_size - 1; 1799 txr->size = size; 1800 1801 return 0; 1802 } 1803 1804 static int fbnic_alloc_tx_ring_buffer(struct fbnic_ring *txr) 1805 { 1806 size_t size = array_size(sizeof(*txr->tx_buf), txr->size_mask + 1); 1807 1808 txr->tx_buf = kvzalloc(size, GFP_KERNEL | __GFP_NOWARN); 1809 1810 return txr->tx_buf ? 0 : -ENOMEM; 1811 } 1812 1813 static int fbnic_alloc_tx_ring_resources(struct fbnic_net *fbn, 1814 struct fbnic_ring *txr) 1815 { 1816 struct device *dev = fbn->netdev->dev.parent; 1817 int err; 1818 1819 if (txr->flags & FBNIC_RING_F_DISABLED) 1820 return 0; 1821 1822 err = fbnic_alloc_tx_ring_desc(fbn, txr); 1823 if (err) 1824 return err; 1825 1826 if (!(txr->flags & FBNIC_RING_F_CTX)) 1827 return 0; 1828 1829 err = fbnic_alloc_tx_ring_buffer(txr); 1830 if (err) 1831 goto free_desc; 1832 1833 return 0; 1834 1835 free_desc: 1836 fbnic_free_ring_resources(dev, txr); 1837 return err; 1838 } 1839 1840 static int fbnic_alloc_rx_ring_desc(struct fbnic_net *fbn, 1841 struct fbnic_ring *rxr) 1842 { 1843 struct device *dev = fbn->netdev->dev.parent; 1844 size_t desc_size = sizeof(*rxr->desc); 1845 u32 rxq_size; 1846 size_t size; 1847 1848 switch (rxr->doorbell - fbnic_ring_csr_base(rxr)) { 1849 case FBNIC_QUEUE_BDQ_HPQ_TAIL: 1850 rxq_size = fbn->hpq_size / FBNIC_BD_FRAG_COUNT; 1851 desc_size *= FBNIC_BD_FRAG_COUNT; 1852 break; 1853 case FBNIC_QUEUE_BDQ_PPQ_TAIL: 1854 rxq_size = fbn->ppq_size / FBNIC_BD_FRAG_COUNT; 1855 desc_size *= FBNIC_BD_FRAG_COUNT; 1856 break; 1857 case FBNIC_QUEUE_RCQ_HEAD: 1858 rxq_size = fbn->rcq_size; 1859 break; 1860 default: 1861 return -EINVAL; 1862 } 1863 1864 /* Round size up to nearest 4K */ 1865 size = ALIGN(array_size(desc_size, rxq_size), 4096); 1866 1867 rxr->desc = dma_alloc_coherent(dev, size, &rxr->dma, 1868 GFP_KERNEL | __GFP_NOWARN); 1869 if (!rxr->desc) 1870 return -ENOMEM; 1871 1872 /* rxq_size should be a power of 2, so mask is just that -1 */ 1873 rxr->size_mask = rxq_size - 1; 1874 rxr->size = size; 1875 1876 return 0; 1877 } 1878 1879 static int fbnic_alloc_rx_ring_buffer(struct fbnic_ring *rxr) 1880 { 1881 size_t size = array_size(sizeof(*rxr->rx_buf), rxr->size_mask + 1); 1882 1883 if (rxr->flags & FBNIC_RING_F_CTX) 1884 size = sizeof(*rxr->rx_buf) * (rxr->size_mask + 1); 1885 else 1886 size = sizeof(*rxr->pkt); 1887 1888 rxr->rx_buf = kvzalloc(size, GFP_KERNEL | __GFP_NOWARN); 1889 1890 return rxr->rx_buf ? 0 : -ENOMEM; 1891 } 1892 1893 static int fbnic_alloc_rx_ring_resources(struct fbnic_net *fbn, 1894 struct fbnic_ring *rxr) 1895 { 1896 struct device *dev = fbn->netdev->dev.parent; 1897 int err; 1898 1899 err = fbnic_alloc_rx_ring_desc(fbn, rxr); 1900 if (err) 1901 return err; 1902 1903 err = fbnic_alloc_rx_ring_buffer(rxr); 1904 if (err) 1905 goto free_desc; 1906 1907 return 0; 1908 1909 free_desc: 1910 fbnic_free_ring_resources(dev, rxr); 1911 return err; 1912 } 1913 1914 static void fbnic_free_qt_resources(struct fbnic_net *fbn, 1915 struct fbnic_q_triad *qt) 1916 { 1917 struct device *dev = fbn->netdev->dev.parent; 1918 1919 fbnic_free_ring_resources(dev, &qt->cmpl); 1920 fbnic_free_ring_resources(dev, &qt->sub1); 1921 fbnic_free_ring_resources(dev, &qt->sub0); 1922 1923 if (xdp_rxq_info_is_reg(&qt->xdp_rxq)) { 1924 xdp_rxq_info_unreg_mem_model(&qt->xdp_rxq); 1925 xdp_rxq_info_unreg(&qt->xdp_rxq); 1926 fbnic_free_qt_page_pools(qt); 1927 } 1928 } 1929 1930 static int fbnic_alloc_tx_qt_resources(struct fbnic_net *fbn, 1931 struct fbnic_q_triad *qt) 1932 { 1933 struct device *dev = fbn->netdev->dev.parent; 1934 int err; 1935 1936 err = fbnic_alloc_tx_ring_resources(fbn, &qt->sub0); 1937 if (err) 1938 return err; 1939 1940 err = fbnic_alloc_tx_ring_resources(fbn, &qt->sub1); 1941 if (err) 1942 goto free_sub0; 1943 1944 err = fbnic_alloc_tx_ring_resources(fbn, &qt->cmpl); 1945 if (err) 1946 goto free_sub1; 1947 1948 return 0; 1949 1950 free_sub1: 1951 fbnic_free_ring_resources(dev, &qt->sub1); 1952 free_sub0: 1953 fbnic_free_ring_resources(dev, &qt->sub0); 1954 return err; 1955 } 1956 1957 static int fbnic_alloc_rx_qt_resources(struct fbnic_net *fbn, 1958 struct fbnic_napi_vector *nv, 1959 struct fbnic_q_triad *qt) 1960 { 1961 struct device *dev = fbn->netdev->dev.parent; 1962 int err; 1963 1964 err = fbnic_alloc_qt_page_pools(fbn, nv, qt); 1965 if (err) 1966 return err; 1967 1968 err = xdp_rxq_info_reg(&qt->xdp_rxq, fbn->netdev, qt->sub0.q_idx, 1969 nv->napi.napi_id); 1970 if (err) 1971 goto free_page_pools; 1972 1973 err = xdp_rxq_info_reg_mem_model(&qt->xdp_rxq, MEM_TYPE_PAGE_POOL, 1974 qt->sub0.page_pool); 1975 if (err) 1976 goto unreg_rxq; 1977 1978 err = fbnic_alloc_rx_ring_resources(fbn, &qt->sub0); 1979 if (err) 1980 goto unreg_mm; 1981 1982 err = fbnic_alloc_rx_ring_resources(fbn, &qt->sub1); 1983 if (err) 1984 goto free_sub0; 1985 1986 err = fbnic_alloc_rx_ring_resources(fbn, &qt->cmpl); 1987 if (err) 1988 goto free_sub1; 1989 1990 return 0; 1991 1992 free_sub1: 1993 fbnic_free_ring_resources(dev, &qt->sub1); 1994 free_sub0: 1995 fbnic_free_ring_resources(dev, &qt->sub0); 1996 unreg_mm: 1997 xdp_rxq_info_unreg_mem_model(&qt->xdp_rxq); 1998 unreg_rxq: 1999 xdp_rxq_info_unreg(&qt->xdp_rxq); 2000 free_page_pools: 2001 fbnic_free_qt_page_pools(qt); 2002 return err; 2003 } 2004 2005 static void fbnic_free_nv_resources(struct fbnic_net *fbn, 2006 struct fbnic_napi_vector *nv) 2007 { 2008 int i; 2009 2010 for (i = 0; i < nv->txt_count + nv->rxt_count; i++) 2011 fbnic_free_qt_resources(fbn, &nv->qt[i]); 2012 } 2013 2014 static int fbnic_alloc_nv_resources(struct fbnic_net *fbn, 2015 struct fbnic_napi_vector *nv) 2016 { 2017 int i, j, err; 2018 2019 /* Allocate Tx Resources */ 2020 for (i = 0; i < nv->txt_count; i++) { 2021 err = fbnic_alloc_tx_qt_resources(fbn, &nv->qt[i]); 2022 if (err) 2023 goto free_qt_resources; 2024 } 2025 2026 /* Allocate Rx Resources */ 2027 for (j = 0; j < nv->rxt_count; j++, i++) { 2028 err = fbnic_alloc_rx_qt_resources(fbn, nv, &nv->qt[i]); 2029 if (err) 2030 goto free_qt_resources; 2031 } 2032 2033 return 0; 2034 2035 free_qt_resources: 2036 while (i--) 2037 fbnic_free_qt_resources(fbn, &nv->qt[i]); 2038 return err; 2039 } 2040 2041 void fbnic_free_resources(struct fbnic_net *fbn) 2042 { 2043 int i; 2044 2045 for (i = 0; i < fbn->num_napi; i++) 2046 fbnic_free_nv_resources(fbn, fbn->napi[i]); 2047 } 2048 2049 int fbnic_alloc_resources(struct fbnic_net *fbn) 2050 { 2051 int i, err = -ENODEV; 2052 2053 for (i = 0; i < fbn->num_napi; i++) { 2054 err = fbnic_alloc_nv_resources(fbn, fbn->napi[i]); 2055 if (err) 2056 goto free_resources; 2057 } 2058 2059 return 0; 2060 2061 free_resources: 2062 while (i--) 2063 fbnic_free_nv_resources(fbn, fbn->napi[i]); 2064 2065 return err; 2066 } 2067 2068 static void fbnic_set_netif_napi(struct fbnic_napi_vector *nv) 2069 { 2070 int i, j; 2071 2072 /* Associate Tx queue with NAPI */ 2073 for (i = 0; i < nv->txt_count; i++) { 2074 struct fbnic_q_triad *qt = &nv->qt[i]; 2075 2076 netif_queue_set_napi(nv->napi.dev, qt->sub0.q_idx, 2077 NETDEV_QUEUE_TYPE_TX, &nv->napi); 2078 } 2079 2080 /* Associate Rx queue with NAPI */ 2081 for (j = 0; j < nv->rxt_count; j++, i++) { 2082 struct fbnic_q_triad *qt = &nv->qt[i]; 2083 2084 netif_queue_set_napi(nv->napi.dev, qt->cmpl.q_idx, 2085 NETDEV_QUEUE_TYPE_RX, &nv->napi); 2086 } 2087 } 2088 2089 static void fbnic_reset_netif_napi(struct fbnic_napi_vector *nv) 2090 { 2091 int i, j; 2092 2093 /* Disassociate Tx queue from NAPI */ 2094 for (i = 0; i < nv->txt_count; i++) { 2095 struct fbnic_q_triad *qt = &nv->qt[i]; 2096 2097 netif_queue_set_napi(nv->napi.dev, qt->sub0.q_idx, 2098 NETDEV_QUEUE_TYPE_TX, NULL); 2099 } 2100 2101 /* Disassociate Rx queue from NAPI */ 2102 for (j = 0; j < nv->rxt_count; j++, i++) { 2103 struct fbnic_q_triad *qt = &nv->qt[i]; 2104 2105 netif_queue_set_napi(nv->napi.dev, qt->cmpl.q_idx, 2106 NETDEV_QUEUE_TYPE_RX, NULL); 2107 } 2108 } 2109 2110 int fbnic_set_netif_queues(struct fbnic_net *fbn) 2111 { 2112 int i, err; 2113 2114 err = netif_set_real_num_queues(fbn->netdev, fbn->num_tx_queues, 2115 fbn->num_rx_queues); 2116 if (err) 2117 return err; 2118 2119 for (i = 0; i < fbn->num_napi; i++) 2120 fbnic_set_netif_napi(fbn->napi[i]); 2121 2122 return 0; 2123 } 2124 2125 void fbnic_reset_netif_queues(struct fbnic_net *fbn) 2126 { 2127 int i; 2128 2129 for (i = 0; i < fbn->num_napi; i++) 2130 fbnic_reset_netif_napi(fbn->napi[i]); 2131 } 2132 2133 static void fbnic_disable_twq0(struct fbnic_ring *txr) 2134 { 2135 u32 twq_ctl = fbnic_ring_rd32(txr, FBNIC_QUEUE_TWQ0_CTL); 2136 2137 twq_ctl &= ~FBNIC_QUEUE_TWQ_CTL_ENABLE; 2138 2139 fbnic_ring_wr32(txr, FBNIC_QUEUE_TWQ0_CTL, twq_ctl); 2140 } 2141 2142 static void fbnic_disable_twq1(struct fbnic_ring *txr) 2143 { 2144 u32 twq_ctl = fbnic_ring_rd32(txr, FBNIC_QUEUE_TWQ1_CTL); 2145 2146 twq_ctl &= ~FBNIC_QUEUE_TWQ_CTL_ENABLE; 2147 2148 fbnic_ring_wr32(txr, FBNIC_QUEUE_TWQ1_CTL, twq_ctl); 2149 } 2150 2151 static void fbnic_disable_tcq(struct fbnic_ring *txr) 2152 { 2153 fbnic_ring_wr32(txr, FBNIC_QUEUE_TCQ_CTL, 0); 2154 fbnic_ring_wr32(txr, FBNIC_QUEUE_TIM_MASK, FBNIC_QUEUE_TIM_MASK_MASK); 2155 } 2156 2157 static void fbnic_disable_bdq(struct fbnic_ring *hpq, struct fbnic_ring *ppq) 2158 { 2159 u32 bdq_ctl = fbnic_ring_rd32(hpq, FBNIC_QUEUE_BDQ_CTL); 2160 2161 bdq_ctl &= ~FBNIC_QUEUE_BDQ_CTL_ENABLE; 2162 2163 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_CTL, bdq_ctl); 2164 } 2165 2166 static void fbnic_disable_rcq(struct fbnic_ring *rxr) 2167 { 2168 fbnic_ring_wr32(rxr, FBNIC_QUEUE_RCQ_CTL, 0); 2169 fbnic_ring_wr32(rxr, FBNIC_QUEUE_RIM_MASK, FBNIC_QUEUE_RIM_MASK_MASK); 2170 } 2171 2172 void fbnic_napi_disable(struct fbnic_net *fbn) 2173 { 2174 int i; 2175 2176 for (i = 0; i < fbn->num_napi; i++) { 2177 napi_disable_locked(&fbn->napi[i]->napi); 2178 2179 fbnic_nv_irq_disable(fbn->napi[i]); 2180 } 2181 } 2182 2183 static void __fbnic_nv_disable(struct fbnic_napi_vector *nv) 2184 { 2185 int i, t; 2186 2187 /* Disable Tx queue triads */ 2188 for (t = 0; t < nv->txt_count; t++) { 2189 struct fbnic_q_triad *qt = &nv->qt[t]; 2190 2191 fbnic_disable_twq0(&qt->sub0); 2192 fbnic_disable_twq1(&qt->sub1); 2193 fbnic_disable_tcq(&qt->cmpl); 2194 } 2195 2196 /* Disable Rx queue triads */ 2197 for (i = 0; i < nv->rxt_count; i++, t++) { 2198 struct fbnic_q_triad *qt = &nv->qt[t]; 2199 2200 fbnic_disable_bdq(&qt->sub0, &qt->sub1); 2201 fbnic_disable_rcq(&qt->cmpl); 2202 } 2203 } 2204 2205 void fbnic_disable(struct fbnic_net *fbn) 2206 { 2207 struct fbnic_dev *fbd = fbn->fbd; 2208 int i; 2209 2210 for (i = 0; i < fbn->num_napi; i++) 2211 __fbnic_nv_disable(fbn->napi[i]); 2212 2213 fbnic_wrfl(fbd); 2214 } 2215 2216 static void fbnic_tx_flush(struct fbnic_dev *fbd) 2217 { 2218 netdev_warn(fbd->netdev, "triggering Tx flush\n"); 2219 2220 fbnic_rmw32(fbd, FBNIC_TMI_DROP_CTRL, FBNIC_TMI_DROP_CTRL_EN, 2221 FBNIC_TMI_DROP_CTRL_EN); 2222 } 2223 2224 static void fbnic_tx_flush_off(struct fbnic_dev *fbd) 2225 { 2226 fbnic_rmw32(fbd, FBNIC_TMI_DROP_CTRL, FBNIC_TMI_DROP_CTRL_EN, 0); 2227 } 2228 2229 struct fbnic_idle_regs { 2230 u32 reg_base; 2231 u8 reg_cnt; 2232 }; 2233 2234 static bool fbnic_all_idle(struct fbnic_dev *fbd, 2235 const struct fbnic_idle_regs *regs, 2236 unsigned int nregs) 2237 { 2238 unsigned int i, j; 2239 2240 for (i = 0; i < nregs; i++) { 2241 for (j = 0; j < regs[i].reg_cnt; j++) { 2242 if (fbnic_rd32(fbd, regs[i].reg_base + j) != ~0U) 2243 return false; 2244 } 2245 } 2246 return true; 2247 } 2248 2249 static void fbnic_idle_dump(struct fbnic_dev *fbd, 2250 const struct fbnic_idle_regs *regs, 2251 unsigned int nregs, const char *dir, int err) 2252 { 2253 unsigned int i, j; 2254 2255 netdev_err(fbd->netdev, "error waiting for %s idle %d\n", dir, err); 2256 for (i = 0; i < nregs; i++) 2257 for (j = 0; j < regs[i].reg_cnt; j++) 2258 netdev_err(fbd->netdev, "0x%04x: %08x\n", 2259 regs[i].reg_base + j, 2260 fbnic_rd32(fbd, regs[i].reg_base + j)); 2261 } 2262 2263 int fbnic_wait_all_queues_idle(struct fbnic_dev *fbd, bool may_fail) 2264 { 2265 static const struct fbnic_idle_regs tx[] = { 2266 { FBNIC_QM_TWQ_IDLE(0), FBNIC_QM_TWQ_IDLE_CNT, }, 2267 { FBNIC_QM_TQS_IDLE(0), FBNIC_QM_TQS_IDLE_CNT, }, 2268 { FBNIC_QM_TDE_IDLE(0), FBNIC_QM_TDE_IDLE_CNT, }, 2269 { FBNIC_QM_TCQ_IDLE(0), FBNIC_QM_TCQ_IDLE_CNT, }, 2270 }, rx[] = { 2271 { FBNIC_QM_HPQ_IDLE(0), FBNIC_QM_HPQ_IDLE_CNT, }, 2272 { FBNIC_QM_PPQ_IDLE(0), FBNIC_QM_PPQ_IDLE_CNT, }, 2273 { FBNIC_QM_RCQ_IDLE(0), FBNIC_QM_RCQ_IDLE_CNT, }, 2274 }; 2275 bool idle; 2276 int err; 2277 2278 err = read_poll_timeout_atomic(fbnic_all_idle, idle, idle, 2, 500000, 2279 false, fbd, tx, ARRAY_SIZE(tx)); 2280 if (err == -ETIMEDOUT) { 2281 fbnic_tx_flush(fbd); 2282 err = read_poll_timeout_atomic(fbnic_all_idle, idle, idle, 2283 2, 500000, false, 2284 fbd, tx, ARRAY_SIZE(tx)); 2285 fbnic_tx_flush_off(fbd); 2286 } 2287 if (err) { 2288 fbnic_idle_dump(fbd, tx, ARRAY_SIZE(tx), "Tx", err); 2289 if (may_fail) 2290 return err; 2291 } 2292 2293 err = read_poll_timeout_atomic(fbnic_all_idle, idle, idle, 2, 500000, 2294 false, fbd, rx, ARRAY_SIZE(rx)); 2295 if (err) 2296 fbnic_idle_dump(fbd, rx, ARRAY_SIZE(rx), "Rx", err); 2297 return err; 2298 } 2299 2300 static void fbnic_nv_flush(struct fbnic_napi_vector *nv) 2301 { 2302 int j, t; 2303 2304 /* Flush any processed Tx Queue Triads and drop the rest */ 2305 for (t = 0; t < nv->txt_count; t++) { 2306 struct fbnic_q_triad *qt = &nv->qt[t]; 2307 struct netdev_queue *tx_queue; 2308 2309 /* Clean the work queues of unprocessed work */ 2310 fbnic_clean_twq0(nv, 0, &qt->sub0, true, qt->sub0.tail); 2311 fbnic_clean_twq1(nv, false, &qt->sub1, true, 2312 qt->sub1.tail); 2313 2314 /* Reset completion queue descriptor ring */ 2315 memset(qt->cmpl.desc, 0, qt->cmpl.size); 2316 2317 /* Nothing else to do if Tx queue is disabled */ 2318 if (qt->sub0.flags & FBNIC_RING_F_DISABLED) 2319 continue; 2320 2321 /* Reset BQL associated with Tx queue */ 2322 tx_queue = netdev_get_tx_queue(nv->napi.dev, 2323 qt->sub0.q_idx); 2324 netdev_tx_reset_queue(tx_queue); 2325 } 2326 2327 /* Flush any processed Rx Queue Triads and drop the rest */ 2328 for (j = 0; j < nv->rxt_count; j++, t++) { 2329 struct fbnic_q_triad *qt = &nv->qt[t]; 2330 2331 /* Clean the work queues of unprocessed work */ 2332 fbnic_clean_bdq(&qt->sub0, qt->sub0.tail, 0); 2333 fbnic_clean_bdq(&qt->sub1, qt->sub1.tail, 0); 2334 2335 /* Reset completion queue descriptor ring */ 2336 memset(qt->cmpl.desc, 0, qt->cmpl.size); 2337 2338 fbnic_put_pkt_buff(qt, qt->cmpl.pkt, 0); 2339 memset(qt->cmpl.pkt, 0, sizeof(struct fbnic_pkt_buff)); 2340 } 2341 } 2342 2343 void fbnic_flush(struct fbnic_net *fbn) 2344 { 2345 int i; 2346 2347 for (i = 0; i < fbn->num_napi; i++) 2348 fbnic_nv_flush(fbn->napi[i]); 2349 } 2350 2351 static void fbnic_nv_fill(struct fbnic_napi_vector *nv) 2352 { 2353 int j, t; 2354 2355 /* Configure NAPI mapping and populate pages 2356 * in the BDQ rings to use for Rx 2357 */ 2358 for (j = 0, t = nv->txt_count; j < nv->rxt_count; j++, t++) { 2359 struct fbnic_q_triad *qt = &nv->qt[t]; 2360 2361 /* Populate the header and payload BDQs */ 2362 fbnic_fill_bdq(&qt->sub0); 2363 fbnic_fill_bdq(&qt->sub1); 2364 } 2365 } 2366 2367 void fbnic_fill(struct fbnic_net *fbn) 2368 { 2369 int i; 2370 2371 for (i = 0; i < fbn->num_napi; i++) 2372 fbnic_nv_fill(fbn->napi[i]); 2373 } 2374 2375 static void fbnic_enable_twq0(struct fbnic_ring *twq) 2376 { 2377 u32 log_size = fls(twq->size_mask); 2378 2379 if (!twq->size_mask) 2380 return; 2381 2382 /* Reset head/tail */ 2383 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ0_CTL, FBNIC_QUEUE_TWQ_CTL_RESET); 2384 twq->tail = 0; 2385 twq->head = 0; 2386 2387 /* Store descriptor ring address and size */ 2388 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ0_BAL, lower_32_bits(twq->dma)); 2389 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ0_BAH, upper_32_bits(twq->dma)); 2390 2391 /* Write lower 4 bits of log size as 64K ring size is 0 */ 2392 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ0_SIZE, log_size & 0xf); 2393 2394 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ0_CTL, FBNIC_QUEUE_TWQ_CTL_ENABLE); 2395 } 2396 2397 static void fbnic_enable_twq1(struct fbnic_ring *twq) 2398 { 2399 u32 log_size = fls(twq->size_mask); 2400 2401 if (!twq->size_mask) 2402 return; 2403 2404 /* Reset head/tail */ 2405 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ1_CTL, FBNIC_QUEUE_TWQ_CTL_RESET); 2406 twq->tail = 0; 2407 twq->head = 0; 2408 2409 /* Store descriptor ring address and size */ 2410 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ1_BAL, lower_32_bits(twq->dma)); 2411 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ1_BAH, upper_32_bits(twq->dma)); 2412 2413 /* Write lower 4 bits of log size as 64K ring size is 0 */ 2414 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ1_SIZE, log_size & 0xf); 2415 2416 fbnic_ring_wr32(twq, FBNIC_QUEUE_TWQ1_CTL, FBNIC_QUEUE_TWQ_CTL_ENABLE); 2417 } 2418 2419 static void fbnic_enable_tcq(struct fbnic_napi_vector *nv, 2420 struct fbnic_ring *tcq) 2421 { 2422 u32 log_size = fls(tcq->size_mask); 2423 2424 if (!tcq->size_mask) 2425 return; 2426 2427 /* Reset head/tail */ 2428 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TCQ_CTL, FBNIC_QUEUE_TCQ_CTL_RESET); 2429 tcq->tail = 0; 2430 tcq->head = 0; 2431 2432 /* Store descriptor ring address and size */ 2433 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TCQ_BAL, lower_32_bits(tcq->dma)); 2434 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TCQ_BAH, upper_32_bits(tcq->dma)); 2435 2436 /* Write lower 4 bits of log size as 64K ring size is 0 */ 2437 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TCQ_SIZE, log_size & 0xf); 2438 2439 /* Store interrupt information for the completion queue */ 2440 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TIM_CTL, nv->v_idx); 2441 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TIM_THRESHOLD, tcq->size_mask / 2); 2442 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TIM_MASK, 0); 2443 2444 /* Enable queue */ 2445 fbnic_ring_wr32(tcq, FBNIC_QUEUE_TCQ_CTL, FBNIC_QUEUE_TCQ_CTL_ENABLE); 2446 } 2447 2448 static void fbnic_enable_bdq(struct fbnic_ring *hpq, struct fbnic_ring *ppq) 2449 { 2450 u32 bdq_ctl = FBNIC_QUEUE_BDQ_CTL_ENABLE; 2451 u32 log_size; 2452 2453 /* Reset head/tail */ 2454 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_CTL, FBNIC_QUEUE_BDQ_CTL_RESET); 2455 ppq->tail = 0; 2456 ppq->head = 0; 2457 hpq->tail = 0; 2458 hpq->head = 0; 2459 2460 log_size = fls(hpq->size_mask); 2461 2462 /* Store descriptor ring address and size */ 2463 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_HPQ_BAL, lower_32_bits(hpq->dma)); 2464 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_HPQ_BAH, upper_32_bits(hpq->dma)); 2465 2466 /* Write lower 4 bits of log size as 64K ring size is 0 */ 2467 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_HPQ_SIZE, log_size & 0xf); 2468 2469 if (!ppq->size_mask) 2470 goto write_ctl; 2471 2472 log_size = fls(ppq->size_mask); 2473 2474 /* Add enabling of PPQ to BDQ control */ 2475 bdq_ctl |= FBNIC_QUEUE_BDQ_CTL_PPQ_ENABLE; 2476 2477 /* Store descriptor ring address and size */ 2478 fbnic_ring_wr32(ppq, FBNIC_QUEUE_BDQ_PPQ_BAL, lower_32_bits(ppq->dma)); 2479 fbnic_ring_wr32(ppq, FBNIC_QUEUE_BDQ_PPQ_BAH, upper_32_bits(ppq->dma)); 2480 fbnic_ring_wr32(ppq, FBNIC_QUEUE_BDQ_PPQ_SIZE, log_size & 0xf); 2481 2482 write_ctl: 2483 fbnic_ring_wr32(hpq, FBNIC_QUEUE_BDQ_CTL, bdq_ctl); 2484 } 2485 2486 static void fbnic_config_drop_mode_rcq(struct fbnic_napi_vector *nv, 2487 struct fbnic_ring *rcq) 2488 { 2489 u32 drop_mode, rcq_ctl; 2490 2491 drop_mode = FBNIC_QUEUE_RDE_CTL0_DROP_IMMEDIATE; 2492 2493 /* Specify packet layout */ 2494 rcq_ctl = FIELD_PREP(FBNIC_QUEUE_RDE_CTL0_DROP_MODE_MASK, drop_mode) | 2495 FIELD_PREP(FBNIC_QUEUE_RDE_CTL0_MIN_HROOM_MASK, FBNIC_RX_HROOM) | 2496 FIELD_PREP(FBNIC_QUEUE_RDE_CTL0_MIN_TROOM_MASK, FBNIC_RX_TROOM); 2497 2498 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RDE_CTL0, rcq_ctl); 2499 } 2500 2501 static void fbnic_config_rim_threshold(struct fbnic_ring *rcq, u16 nv_idx, u32 rx_desc) 2502 { 2503 u32 threshold; 2504 2505 /* Set the threhsold to half the ring size if rx_frames 2506 * is not configured 2507 */ 2508 threshold = rx_desc ? : rcq->size_mask / 2; 2509 2510 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RIM_CTL, nv_idx); 2511 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RIM_THRESHOLD, threshold); 2512 } 2513 2514 void fbnic_config_txrx_usecs(struct fbnic_napi_vector *nv, u32 arm) 2515 { 2516 struct fbnic_net *fbn = netdev_priv(nv->napi.dev); 2517 struct fbnic_dev *fbd = nv->fbd; 2518 u32 val = arm; 2519 2520 val |= FIELD_PREP(FBNIC_INTR_CQ_REARM_RCQ_TIMEOUT, fbn->rx_usecs) | 2521 FBNIC_INTR_CQ_REARM_RCQ_TIMEOUT_UPD_EN; 2522 val |= FIELD_PREP(FBNIC_INTR_CQ_REARM_TCQ_TIMEOUT, fbn->tx_usecs) | 2523 FBNIC_INTR_CQ_REARM_TCQ_TIMEOUT_UPD_EN; 2524 2525 fbnic_wr32(fbd, FBNIC_INTR_CQ_REARM(nv->v_idx), val); 2526 } 2527 2528 void fbnic_config_rx_frames(struct fbnic_napi_vector *nv) 2529 { 2530 struct fbnic_net *fbn = netdev_priv(nv->napi.dev); 2531 int i; 2532 2533 for (i = nv->txt_count; i < nv->rxt_count + nv->txt_count; i++) { 2534 struct fbnic_q_triad *qt = &nv->qt[i]; 2535 2536 fbnic_config_rim_threshold(&qt->cmpl, nv->v_idx, 2537 fbn->rx_max_frames * 2538 FBNIC_MIN_RXD_PER_FRAME); 2539 } 2540 } 2541 2542 static void fbnic_enable_rcq(struct fbnic_napi_vector *nv, 2543 struct fbnic_ring *rcq) 2544 { 2545 struct fbnic_net *fbn = netdev_priv(nv->napi.dev); 2546 u32 log_size = fls(rcq->size_mask); 2547 u32 hds_thresh = fbn->hds_thresh; 2548 u32 rcq_ctl = 0; 2549 2550 fbnic_config_drop_mode_rcq(nv, rcq); 2551 2552 /* Force lower bound on MAX_HEADER_BYTES. Below this, all frames should 2553 * be split at L4. It would also result in the frames being split at 2554 * L2/L3 depending on the frame size. 2555 */ 2556 if (fbn->hds_thresh < FBNIC_HDR_BYTES_MIN) { 2557 rcq_ctl = FBNIC_QUEUE_RDE_CTL0_EN_HDR_SPLIT; 2558 hds_thresh = FBNIC_HDR_BYTES_MIN; 2559 } 2560 2561 rcq_ctl |= FIELD_PREP(FBNIC_QUEUE_RDE_CTL1_PADLEN_MASK, FBNIC_RX_PAD) | 2562 FIELD_PREP(FBNIC_QUEUE_RDE_CTL1_MAX_HDR_MASK, hds_thresh) | 2563 FIELD_PREP(FBNIC_QUEUE_RDE_CTL1_PAYLD_OFF_MASK, 2564 FBNIC_RX_PAYLD_OFFSET) | 2565 FIELD_PREP(FBNIC_QUEUE_RDE_CTL1_PAYLD_PG_CL_MASK, 2566 FBNIC_RX_PAYLD_PG_CL); 2567 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RDE_CTL1, rcq_ctl); 2568 2569 /* Reset head/tail */ 2570 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RCQ_CTL, FBNIC_QUEUE_RCQ_CTL_RESET); 2571 rcq->head = 0; 2572 rcq->tail = 0; 2573 2574 /* Store descriptor ring address and size */ 2575 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RCQ_BAL, lower_32_bits(rcq->dma)); 2576 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RCQ_BAH, upper_32_bits(rcq->dma)); 2577 2578 /* Write lower 4 bits of log size as 64K ring size is 0 */ 2579 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RCQ_SIZE, log_size & 0xf); 2580 2581 /* Store interrupt information for the completion queue */ 2582 fbnic_config_rim_threshold(rcq, nv->v_idx, fbn->rx_max_frames * 2583 FBNIC_MIN_RXD_PER_FRAME); 2584 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RIM_MASK, 0); 2585 2586 /* Enable queue */ 2587 fbnic_ring_wr32(rcq, FBNIC_QUEUE_RCQ_CTL, FBNIC_QUEUE_RCQ_CTL_ENABLE); 2588 } 2589 2590 static void __fbnic_nv_enable(struct fbnic_napi_vector *nv) 2591 { 2592 int j, t; 2593 2594 /* Setup Tx Queue Triads */ 2595 for (t = 0; t < nv->txt_count; t++) { 2596 struct fbnic_q_triad *qt = &nv->qt[t]; 2597 2598 fbnic_enable_twq0(&qt->sub0); 2599 fbnic_enable_twq1(&qt->sub1); 2600 fbnic_enable_tcq(nv, &qt->cmpl); 2601 } 2602 2603 /* Setup Rx Queue Triads */ 2604 for (j = 0; j < nv->rxt_count; j++, t++) { 2605 struct fbnic_q_triad *qt = &nv->qt[t]; 2606 2607 fbnic_enable_bdq(&qt->sub0, &qt->sub1); 2608 fbnic_config_drop_mode_rcq(nv, &qt->cmpl); 2609 fbnic_enable_rcq(nv, &qt->cmpl); 2610 } 2611 } 2612 2613 void fbnic_enable(struct fbnic_net *fbn) 2614 { 2615 struct fbnic_dev *fbd = fbn->fbd; 2616 int i; 2617 2618 for (i = 0; i < fbn->num_napi; i++) 2619 __fbnic_nv_enable(fbn->napi[i]); 2620 2621 fbnic_wrfl(fbd); 2622 } 2623 2624 static void fbnic_nv_irq_enable(struct fbnic_napi_vector *nv) 2625 { 2626 fbnic_config_txrx_usecs(nv, FBNIC_INTR_CQ_REARM_INTR_UNMASK); 2627 } 2628 2629 void fbnic_napi_enable(struct fbnic_net *fbn) 2630 { 2631 u32 irqs[FBNIC_MAX_MSIX_VECS / 32] = {}; 2632 struct fbnic_dev *fbd = fbn->fbd; 2633 int i; 2634 2635 for (i = 0; i < fbn->num_napi; i++) { 2636 struct fbnic_napi_vector *nv = fbn->napi[i]; 2637 2638 napi_enable_locked(&nv->napi); 2639 2640 fbnic_nv_irq_enable(nv); 2641 2642 /* Record bit used for NAPI IRQs so we can 2643 * set the mask appropriately 2644 */ 2645 irqs[nv->v_idx / 32] |= BIT(nv->v_idx % 32); 2646 } 2647 2648 /* Force the first interrupt on the device to guarantee 2649 * that any packets that may have been enqueued during the 2650 * bringup are processed. 2651 */ 2652 for (i = 0; i < ARRAY_SIZE(irqs); i++) { 2653 if (!irqs[i]) 2654 continue; 2655 fbnic_wr32(fbd, FBNIC_INTR_SET(i), irqs[i]); 2656 } 2657 2658 fbnic_wrfl(fbd); 2659 } 2660 2661 void fbnic_napi_depletion_check(struct net_device *netdev) 2662 { 2663 struct fbnic_net *fbn = netdev_priv(netdev); 2664 u32 irqs[FBNIC_MAX_MSIX_VECS / 32] = {}; 2665 struct fbnic_dev *fbd = fbn->fbd; 2666 int i, j, t; 2667 2668 for (i = 0; i < fbn->num_napi; i++) { 2669 struct fbnic_napi_vector *nv = fbn->napi[i]; 2670 2671 /* Find RQs which are completely out of pages */ 2672 for (t = nv->txt_count, j = 0; j < nv->rxt_count; j++, t++) { 2673 /* Assume 4 pages is always enough to fit a packet 2674 * and therefore generate a completion and an IRQ. 2675 */ 2676 if (fbnic_desc_used(&nv->qt[t].sub0) < 4 || 2677 fbnic_desc_used(&nv->qt[t].sub1) < 4) 2678 irqs[nv->v_idx / 32] |= BIT(nv->v_idx % 32); 2679 } 2680 } 2681 2682 for (i = 0; i < ARRAY_SIZE(irqs); i++) { 2683 if (!irqs[i]) 2684 continue; 2685 fbnic_wr32(fbd, FBNIC_INTR_MASK_CLEAR(i), irqs[i]); 2686 fbnic_wr32(fbd, FBNIC_INTR_SET(i), irqs[i]); 2687 } 2688 2689 fbnic_wrfl(fbd); 2690 } 2691