1584 lines · c
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 18static 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 23static 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 28static 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 39static __le6440nfp_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, l4_hdrlen;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 l4_hdrlen = (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ?51 sizeof(struct udphdr) : tcp_hdrlen(skb);52 } else {53 l3_offset = skb_inner_network_offset(skb);54 l4_offset = skb_inner_transport_offset(skb);55 l4_hdrlen = (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ?56 sizeof(struct udphdr) : inner_tcp_hdrlen(skb);57 }58 59 hdrlen = l4_offset + l4_hdrlen;60 segs = skb_shinfo(skb)->gso_segs;61 mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK;62 63 txd.l3_offset = l3_offset;64 txd.l4_offset = l4_offset;65 txd.lso_meta_res = 0;66 txd.mss = cpu_to_le16(mss);67 txd.lso_hdrlen = hdrlen;68 txd.lso_totsegs = segs;69 70 txbuf->pkt_cnt = segs;71 txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1);72 73 u64_stats_update_begin(&r_vec->tx_sync);74 r_vec->tx_lso++;75 u64_stats_update_end(&r_vec->tx_sync);76 77 return txd.raw;78}79 80static u881nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,82 unsigned int pkt_cnt, struct sk_buff *skb, u64 flags)83{84 struct ipv6hdr *ipv6h;85 struct iphdr *iph;86 87 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))88 return flags;89 90 if (skb->ip_summed != CHECKSUM_PARTIAL)91 return flags;92 93 flags |= NFDK_DESC_TX_L4_CSUM;94 95 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);96 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);97 98 /* L3 checksum offloading flag is not required for ipv6 */99 if (iph->version == 4) {100 flags |= NFDK_DESC_TX_L3_CSUM;101 } else if (ipv6h->version != 6) {102 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);103 return flags;104 }105 106 u64_stats_update_begin(&r_vec->tx_sync);107 if (!skb->encapsulation) {108 r_vec->hw_csum_tx += pkt_cnt;109 } else {110 flags |= NFDK_DESC_TX_ENCAP;111 r_vec->hw_csum_tx_inner += pkt_cnt;112 }113 u64_stats_update_end(&r_vec->tx_sync);114 115 return flags;116}117 118static int119nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring,120 struct sk_buff *skb)121{122 unsigned int n_descs, wr_p, nop_slots;123 const skb_frag_t *frag, *fend;124 struct nfp_nfdk_tx_desc *txd;125 unsigned int nr_frags;126 unsigned int wr_idx;127 int err;128 129recount_descs:130 n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb));131 nr_frags = skb_shinfo(skb)->nr_frags;132 frag = skb_shinfo(skb)->frags;133 fend = frag + nr_frags;134 for (; frag < fend; frag++)135 n_descs += DIV_ROUND_UP(skb_frag_size(frag),136 NFDK_TX_MAX_DATA_PER_DESC);137 138 if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) {139 if (skb_is_nonlinear(skb)) {140 err = skb_linearize(skb);141 if (err)142 return err;143 goto recount_descs;144 }145 return -EINVAL;146 }147 148 /* Under count by 1 (don't count meta) for the round down to work out */149 n_descs += !!skb_is_gso(skb);150 151 if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=152 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT))153 goto close_block;154 155 if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK)156 goto close_block;157 158 return 0;159 160close_block:161 wr_p = tx_ring->wr_p;162 nop_slots = D_BLOCK_CPL(wr_p);163 164 wr_idx = D_IDX(tx_ring, wr_p);165 tx_ring->ktxbufs[wr_idx].skb = NULL;166 txd = &tx_ring->ktxds[wr_idx];167 168 memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));169 170 tx_ring->data_pending = 0;171 tx_ring->wr_p += nop_slots;172 tx_ring->wr_ptr_add += nop_slots;173 174 return 0;175}176 177static int178nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app,179 struct sk_buff *skb, bool *ipsec)180{181 struct metadata_dst *md_dst = skb_metadata_dst(skb);182 struct nfp_ipsec_offload offload_info;183 unsigned char *data;184 bool vlan_insert;185 u32 meta_id = 0;186 int md_bytes;187 188#ifdef CONFIG_NFP_NET_IPSEC189 if (xfrm_offload(skb))190 *ipsec = nfp_net_ipsec_tx_prep(dp, skb, &offload_info);191#endif192 193 if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX))194 md_dst = NULL;195 196 vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2);197 198 if (!(md_dst || vlan_insert || *ipsec))199 return 0;200 201 md_bytes = sizeof(meta_id) +202 (!!md_dst ? NFP_NET_META_PORTID_SIZE : 0) +203 (vlan_insert ? NFP_NET_META_VLAN_SIZE : 0) +204 (*ipsec ? NFP_NET_META_IPSEC_FIELD_SIZE : 0);205 206 if (unlikely(skb_cow_head(skb, md_bytes)))207 return -ENOMEM;208 209 data = skb_push(skb, md_bytes) + md_bytes;210 if (md_dst) {211 data -= NFP_NET_META_PORTID_SIZE;212 put_unaligned_be32(md_dst->u.port_info.port_id, data);213 meta_id = NFP_NET_META_PORTID;214 }215 if (vlan_insert) {216 data -= NFP_NET_META_VLAN_SIZE;217 /* data type of skb->vlan_proto is __be16218 * so it fills metadata without calling put_unaligned_be16219 */220 memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto));221 put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto));222 meta_id <<= NFP_NET_META_FIELD_SIZE;223 meta_id |= NFP_NET_META_VLAN;224 }225 226 if (*ipsec) {227 data -= NFP_NET_META_IPSEC_SIZE;228 put_unaligned_be32(offload_info.seq_hi, data);229 data -= NFP_NET_META_IPSEC_SIZE;230 put_unaligned_be32(offload_info.seq_low, data);231 data -= NFP_NET_META_IPSEC_SIZE;232 put_unaligned_be32(offload_info.handle - 1, data);233 meta_id <<= NFP_NET_META_IPSEC_FIELD_SIZE;234 meta_id |= NFP_NET_META_IPSEC << 8 | NFP_NET_META_IPSEC << 4 | NFP_NET_META_IPSEC;235 }236 237 meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) |238 FIELD_PREP(NFDK_META_FIELDS, meta_id);239 240 data -= sizeof(meta_id);241 put_unaligned_be32(meta_id, data);242 243 return NFDK_DESC_TX_CHAIN_META;244}245 246/**247 * nfp_nfdk_tx() - Main transmit entry point248 * @skb: SKB to transmit249 * @netdev: netdev structure250 *251 * Return: NETDEV_TX_OK on success.252 */253netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)254{255 struct nfp_net *nn = netdev_priv(netdev);256 struct nfp_nfdk_tx_buf *txbuf, *etxbuf;257 u32 cnt, tmp_dlen, dlen_type = 0;258 struct nfp_net_tx_ring *tx_ring;259 struct nfp_net_r_vector *r_vec;260 const skb_frag_t *frag, *fend;261 struct nfp_nfdk_tx_desc *txd;262 unsigned int real_len, qidx;263 unsigned int dma_len, type;264 struct netdev_queue *nd_q;265 struct nfp_net_dp *dp;266 int nr_frags, wr_idx;267 dma_addr_t dma_addr;268 bool ipsec = false;269 u64 metadata;270 271 dp = &nn->dp;272 qidx = skb_get_queue_mapping(skb);273 tx_ring = &dp->tx_rings[qidx];274 r_vec = tx_ring->r_vec;275 nd_q = netdev_get_tx_queue(dp->netdev, qidx);276 277 /* Don't bother counting frags, assume the worst */278 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {279 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",280 qidx, tx_ring->wr_p, tx_ring->rd_p);281 netif_tx_stop_queue(nd_q);282 nfp_net_tx_xmit_more_flush(tx_ring);283 u64_stats_update_begin(&r_vec->tx_sync);284 r_vec->tx_busy++;285 u64_stats_update_end(&r_vec->tx_sync);286 return NETDEV_TX_BUSY;287 }288 289 metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb, &ipsec);290 if (unlikely((int)metadata < 0))291 goto err_flush;292 293 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))294 goto err_flush;295 296 /* nr_frags will change after skb_linearize so we get nr_frags after297 * nfp_nfdk_tx_maybe_close_block function298 */299 nr_frags = skb_shinfo(skb)->nr_frags;300 /* DMA map all */301 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);302 txd = &tx_ring->ktxds[wr_idx];303 txbuf = &tx_ring->ktxbufs[wr_idx];304 305 dma_len = skb_headlen(skb);306 if (skb_is_gso(skb))307 type = NFDK_DESC_TX_TYPE_TSO;308 else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)309 type = NFDK_DESC_TX_TYPE_SIMPLE;310 else311 type = NFDK_DESC_TX_TYPE_GATHER;312 313 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);314 if (dma_mapping_error(dp->dev, dma_addr))315 goto err_warn_dma;316 317 txbuf->skb = skb;318 txbuf++;319 320 txbuf->dma_addr = dma_addr;321 txbuf++;322 323 /* FIELD_PREP() implicitly truncates to chunk */324 dma_len -= 1;325 326 /* We will do our best to pass as much data as we can in descriptor327 * and we need to make sure the first descriptor includes whole head328 * since there is limitation in firmware side. Sometimes the value of329 * dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than330 * headlen.331 */332 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,333 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?334 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |335 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);336 337 txd->dma_len_type = cpu_to_le16(dlen_type);338 nfp_desc_set_dma_addr_48b(txd, dma_addr);339 340 /* starts at bit 0 */341 BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1));342 343 /* Preserve the original dlen_type, this way below the EOP logic344 * can use dlen_type.345 */346 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;347 dma_len -= tmp_dlen;348 dma_addr += tmp_dlen + 1;349 txd++;350 351 /* The rest of the data (if any) will be in larger dma descritors352 * and is handled with the fragment loop.353 */354 frag = skb_shinfo(skb)->frags;355 fend = frag + nr_frags;356 357 while (true) {358 while (dma_len > 0) {359 dma_len -= 1;360 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);361 362 txd->dma_len_type = cpu_to_le16(dlen_type);363 nfp_desc_set_dma_addr_48b(txd, dma_addr);364 365 dma_len -= dlen_type;366 dma_addr += dlen_type + 1;367 txd++;368 }369 370 if (frag >= fend)371 break;372 373 dma_len = skb_frag_size(frag);374 dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len,375 DMA_TO_DEVICE);376 if (dma_mapping_error(dp->dev, dma_addr))377 goto err_unmap;378 379 txbuf->dma_addr = dma_addr;380 txbuf++;381 382 frag++;383 }384 385 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);386 387 if (ipsec)388 metadata = nfp_nfdk_ipsec_tx(metadata, skb);389 390 if (!skb_is_gso(skb)) {391 real_len = skb->len;392 /* Metadata desc */393 if (!ipsec)394 metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);395 txd->raw = cpu_to_le64(metadata);396 txd++;397 } else {398 /* lso desc should be placed after metadata desc */399 (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);400 real_len = txbuf->real_len;401 /* Metadata desc */402 if (!ipsec)403 metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);404 txd->raw = cpu_to_le64(metadata);405 txd += 2;406 txbuf++;407 }408 409 cnt = txd - tx_ring->ktxds - wr_idx;410 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=411 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))412 goto err_warn_overflow;413 414 skb_tx_timestamp(skb);415 416 tx_ring->wr_p += cnt;417 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)418 tx_ring->data_pending += skb->len;419 else420 tx_ring->data_pending = 0;421 422 if (nfp_nfdk_tx_ring_should_stop(tx_ring))423 nfp_nfdk_tx_ring_stop(nd_q, tx_ring);424 425 tx_ring->wr_ptr_add += cnt;426 if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more()))427 nfp_net_tx_xmit_more_flush(tx_ring);428 429 return NETDEV_TX_OK;430 431err_warn_overflow:432 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",433 wr_idx, skb_headlen(skb), nr_frags, cnt);434 if (skb_is_gso(skb))435 txbuf--;436err_unmap:437 /* txbuf pointed to the next-to-use */438 etxbuf = txbuf;439 /* first txbuf holds the skb */440 txbuf = &tx_ring->ktxbufs[wr_idx + 1];441 if (txbuf < etxbuf) {442 dma_unmap_single(dp->dev, txbuf->dma_addr,443 skb_headlen(skb), DMA_TO_DEVICE);444 txbuf->raw = 0;445 txbuf++;446 }447 frag = skb_shinfo(skb)->frags;448 while (etxbuf < txbuf) {449 dma_unmap_page(dp->dev, txbuf->dma_addr,450 skb_frag_size(frag), DMA_TO_DEVICE);451 txbuf->raw = 0;452 frag++;453 txbuf++;454 }455err_warn_dma:456 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");457err_flush:458 nfp_net_tx_xmit_more_flush(tx_ring);459 u64_stats_update_begin(&r_vec->tx_sync);460 r_vec->tx_errors++;461 u64_stats_update_end(&r_vec->tx_sync);462 dev_kfree_skb_any(skb);463 return NETDEV_TX_OK;464}465 466/**467 * nfp_nfdk_tx_complete() - Handled completed TX packets468 * @tx_ring: TX ring structure469 * @budget: NAPI budget (only used as bool to determine if in NAPI context)470 */471static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget)472{473 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;474 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;475 u32 done_pkts = 0, done_bytes = 0;476 struct nfp_nfdk_tx_buf *ktxbufs;477 struct device *dev = dp->dev;478 struct netdev_queue *nd_q;479 u32 rd_p, qcp_rd_p;480 int todo;481 482 rd_p = tx_ring->rd_p;483 if (tx_ring->wr_p == rd_p)484 return;485 486 /* Work out how many descriptors have been transmitted */487 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);488 489 if (qcp_rd_p == tx_ring->qcp_rd_p)490 return;491 492 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);493 ktxbufs = tx_ring->ktxbufs;494 495 while (todo > 0) {496 const skb_frag_t *frag, *fend;497 unsigned int size, n_descs = 1;498 struct nfp_nfdk_tx_buf *txbuf;499 struct sk_buff *skb;500 501 txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)];502 skb = txbuf->skb;503 txbuf++;504 505 /* Closed block */506 if (!skb) {507 n_descs = D_BLOCK_CPL(rd_p);508 goto next;509 }510 511 /* Unmap head */512 size = skb_headlen(skb);513 n_descs += nfp_nfdk_headlen_to_segs(size);514 dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);515 txbuf++;516 517 /* Unmap frags */518 frag = skb_shinfo(skb)->frags;519 fend = frag + skb_shinfo(skb)->nr_frags;520 for (; frag < fend; frag++) {521 size = skb_frag_size(frag);522 n_descs += DIV_ROUND_UP(size,523 NFDK_TX_MAX_DATA_PER_DESC);524 dma_unmap_page(dev, txbuf->dma_addr,525 skb_frag_size(frag), DMA_TO_DEVICE);526 txbuf++;527 }528 529 if (!skb_is_gso(skb)) {530 done_bytes += skb->len;531 done_pkts++;532 } else {533 done_bytes += txbuf->real_len;534 done_pkts += txbuf->pkt_cnt;535 n_descs++;536 }537 538 napi_consume_skb(skb, budget);539next:540 rd_p += n_descs;541 todo -= n_descs;542 }543 544 tx_ring->rd_p = rd_p;545 tx_ring->qcp_rd_p = qcp_rd_p;546 547 u64_stats_update_begin(&r_vec->tx_sync);548 r_vec->tx_bytes += done_bytes;549 r_vec->tx_pkts += done_pkts;550 u64_stats_update_end(&r_vec->tx_sync);551 552 if (!dp->netdev)553 return;554 555 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);556 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);557 if (nfp_nfdk_tx_ring_should_wake(tx_ring)) {558 /* Make sure TX thread will see updated tx_ring->rd_p */559 smp_mb();560 561 if (unlikely(netif_tx_queue_stopped(nd_q)))562 netif_tx_wake_queue(nd_q);563 }564 565 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,566 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",567 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);568}569 570/* Receive processing */571static void *572nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)573{574 void *frag;575 576 if (!dp->xdp_prog) {577 frag = napi_alloc_frag(dp->fl_bufsz);578 if (unlikely(!frag))579 return NULL;580 } else {581 struct page *page;582 583 page = dev_alloc_page();584 if (unlikely(!page))585 return NULL;586 frag = page_address(page);587 }588 589 *dma_addr = nfp_net_dma_map_rx(dp, frag);590 if (dma_mapping_error(dp->dev, *dma_addr)) {591 nfp_net_free_frag(frag, dp->xdp_prog);592 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");593 return NULL;594 }595 596 return frag;597}598 599/**600 * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings601 * @dp: NFP Net data path struct602 * @rx_ring: RX ring structure603 * @frag: page fragment buffer604 * @dma_addr: DMA address of skb mapping605 */606static void607nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp,608 struct nfp_net_rx_ring *rx_ring,609 void *frag, dma_addr_t dma_addr)610{611 unsigned int wr_idx;612 613 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);614 615 nfp_net_dma_sync_dev_rx(dp, dma_addr);616 617 /* Stash SKB and DMA address away */618 rx_ring->rxbufs[wr_idx].frag = frag;619 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;620 621 /* Fill freelist descriptor */622 rx_ring->rxds[wr_idx].fld.reserved = 0;623 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;624 nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld,625 dma_addr + dp->rx_dma_off);626 627 rx_ring->wr_p++;628 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {629 /* Update write pointer of the freelist queue. Make630 * sure all writes are flushed before telling the hardware.631 */632 wmb();633 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);634 }635}636 637/**638 * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW639 * @dp: NFP Net data path struct640 * @rx_ring: RX ring to fill641 */642void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp,643 struct nfp_net_rx_ring *rx_ring)644{645 unsigned int i;646 647 for (i = 0; i < rx_ring->cnt - 1; i++)648 nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,649 rx_ring->rxbufs[i].dma_addr);650}651 652/**653 * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors654 * @flags: RX descriptor flags field in CPU byte order655 */656static int nfp_nfdk_rx_csum_has_errors(u16 flags)657{658 u16 csum_all_checked, csum_all_ok;659 660 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;661 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;662 663 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);664}665 666/**667 * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags668 * @dp: NFP Net data path struct669 * @r_vec: per-ring structure670 * @rxd: Pointer to RX descriptor671 * @meta: Parsed metadata prepend672 * @skb: Pointer to SKB673 */674static void675nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,676 struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta,677 struct sk_buff *skb)678{679 skb_checksum_none_assert(skb);680 681 if (!(dp->netdev->features & NETIF_F_RXCSUM))682 return;683 684 if (meta->csum_type) {685 skb->ip_summed = meta->csum_type;686 skb->csum = meta->csum;687 u64_stats_update_begin(&r_vec->rx_sync);688 r_vec->hw_csum_rx_complete++;689 u64_stats_update_end(&r_vec->rx_sync);690 return;691 }692 693 if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {694 u64_stats_update_begin(&r_vec->rx_sync);695 r_vec->hw_csum_rx_error++;696 u64_stats_update_end(&r_vec->rx_sync);697 return;698 }699 700 /* Assume that the firmware will never report inner CSUM_OK unless outer701 * L4 headers were successfully parsed. FW will always report zero UDP702 * checksum as CSUM_OK.703 */704 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||705 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {706 __skb_incr_checksum_unnecessary(skb);707 u64_stats_update_begin(&r_vec->rx_sync);708 r_vec->hw_csum_rx_ok++;709 u64_stats_update_end(&r_vec->rx_sync);710 }711 712 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||713 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {714 __skb_incr_checksum_unnecessary(skb);715 u64_stats_update_begin(&r_vec->rx_sync);716 r_vec->hw_csum_rx_inner_ok++;717 u64_stats_update_end(&r_vec->rx_sync);718 }719}720 721static void722nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,723 unsigned int type, __be32 *hash)724{725 if (!(netdev->features & NETIF_F_RXHASH))726 return;727 728 switch (type) {729 case NFP_NET_RSS_IPV4:730 case NFP_NET_RSS_IPV6:731 case NFP_NET_RSS_IPV6_EX:732 meta->hash_type = PKT_HASH_TYPE_L3;733 break;734 default:735 meta->hash_type = PKT_HASH_TYPE_L4;736 break;737 }738 739 meta->hash = get_unaligned_be32(hash);740}741 742static bool743nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,744 void *data, void *pkt, unsigned int pkt_len, int meta_len)745{746 u32 meta_info, vlan_info;747 748 meta_info = get_unaligned_be32(data);749 data += 4;750 751 while (meta_info) {752 switch (meta_info & NFP_NET_META_FIELD_MASK) {753 case NFP_NET_META_HASH:754 meta_info >>= NFP_NET_META_FIELD_SIZE;755 nfp_nfdk_set_hash(netdev, meta,756 meta_info & NFP_NET_META_FIELD_MASK,757 (__be32 *)data);758 data += 4;759 break;760 case NFP_NET_META_MARK:761 meta->mark = get_unaligned_be32(data);762 data += 4;763 break;764 case NFP_NET_META_VLAN:765 vlan_info = get_unaligned_be32(data);766 if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) {767 meta->vlan.stripped = true;768 meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK,769 vlan_info);770 meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK,771 vlan_info);772 }773 data += 4;774 break;775 case NFP_NET_META_PORTID:776 meta->portid = get_unaligned_be32(data);777 data += 4;778 break;779 case NFP_NET_META_CSUM:780 meta->csum_type = CHECKSUM_COMPLETE;781 meta->csum =782 (__force __wsum)__get_unaligned_cpu32(data);783 data += 4;784 break;785 case NFP_NET_META_RESYNC_INFO:786 if (nfp_net_tls_rx_resync_req(netdev, data, pkt,787 pkt_len))788 return false;789 data += sizeof(struct nfp_net_tls_resync_req);790 break;791#ifdef CONFIG_NFP_NET_IPSEC792 case NFP_NET_META_IPSEC:793 /* Note: IPsec packet could have zero saidx, so need add 1794 * to indicate packet is IPsec packet within driver.795 */796 meta->ipsec_saidx = get_unaligned_be32(data) + 1;797 data += 4;798 break;799#endif800 default:801 return true;802 }803 804 meta_info >>= NFP_NET_META_FIELD_SIZE;805 }806 807 return data != pkt;808}809 810static void811nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,812 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,813 struct sk_buff *skb)814{815 u64_stats_update_begin(&r_vec->rx_sync);816 r_vec->rx_drops++;817 /* If we have both skb and rxbuf the replacement buffer allocation818 * must have failed, count this as an alloc failure.819 */820 if (skb && rxbuf)821 r_vec->rx_replace_buf_alloc_fail++;822 u64_stats_update_end(&r_vec->rx_sync);823 824 /* skb is build based on the frag, free_skb() would free the frag825 * so to be able to reuse it we need an extra ref.826 */827 if (skb && rxbuf && skb->head == rxbuf->frag)828 page_ref_inc(virt_to_head_page(rxbuf->frag));829 if (rxbuf)830 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);831 if (skb)832 dev_kfree_skb_any(skb);833}834 835static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring)836{837 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;838 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;839 struct nfp_net_rx_ring *rx_ring;840 u32 qcp_rd_p, done = 0;841 bool done_all;842 int todo;843 844 /* Work out how many descriptors have been transmitted */845 qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);846 if (qcp_rd_p == tx_ring->qcp_rd_p)847 return true;848 849 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);850 851 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;852 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);853 854 rx_ring = r_vec->rx_ring;855 while (todo > 0) {856 int idx = D_IDX(tx_ring, tx_ring->rd_p + done);857 struct nfp_nfdk_tx_buf *txbuf;858 unsigned int step = 1;859 860 txbuf = &tx_ring->ktxbufs[idx];861 if (!txbuf->raw)862 goto next;863 864 if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) {865 WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n");866 goto next;867 }868 869 /* Two successive txbufs are used to stash virtual and dma870 * address respectively, recycle and clean them here.871 */872 nfp_nfdk_rx_give_one(dp, rx_ring,873 (void *)NFDK_TX_BUF_PTR(txbuf[0].val),874 txbuf[1].dma_addr);875 txbuf[0].raw = 0;876 txbuf[1].raw = 0;877 step = 2;878 879 u64_stats_update_begin(&r_vec->tx_sync);880 /* Note: tx_bytes not accumulated. */881 r_vec->tx_pkts++;882 u64_stats_update_end(&r_vec->tx_sync);883next:884 todo -= step;885 done += step;886 }887 888 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done);889 tx_ring->rd_p += done;890 891 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,892 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",893 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);894 895 return done_all;896}897 898static bool899nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,900 struct nfp_net_tx_ring *tx_ring,901 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,902 unsigned int pkt_len, bool *completed)903{904 unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA;905 unsigned int dma_len, type, cnt, dlen_type, tmp_dlen;906 struct nfp_nfdk_tx_buf *txbuf;907 struct nfp_nfdk_tx_desc *txd;908 unsigned int n_descs;909 dma_addr_t dma_addr;910 int wr_idx;911 912 /* Reject if xdp_adjust_tail grow packet beyond DMA area */913 if (pkt_len + dma_off > dma_map_sz)914 return false;915 916 /* Make sure there's still at least one block available after917 * aligning to block boundary, so that the txds used below918 * won't wrap around the tx_ring.919 */920 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {921 if (!*completed) {922 nfp_nfdk_xdp_complete(tx_ring);923 *completed = true;924 }925 926 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {927 nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,928 NULL);929 return false;930 }931 }932 933 /* Check if cross block boundary */934 n_descs = nfp_nfdk_headlen_to_segs(pkt_len);935 if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=936 round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) ||937 ((u32)tx_ring->data_pending + pkt_len >938 NFDK_TX_MAX_DATA_PER_BLOCK)) {939 unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p);940 941 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);942 txd = &tx_ring->ktxds[wr_idx];943 memset(txd, 0,944 array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));945 946 tx_ring->data_pending = 0;947 tx_ring->wr_p += nop_slots;948 tx_ring->wr_ptr_add += nop_slots;949 }950 951 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);952 953 txbuf = &tx_ring->ktxbufs[wr_idx];954 955 txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP;956 txbuf[1].dma_addr = rxbuf->dma_addr;957 /* Note: pkt len not stored */958 959 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,960 pkt_len, DMA_BIDIRECTIONAL);961 962 /* Build TX descriptor */963 txd = &tx_ring->ktxds[wr_idx];964 dma_len = pkt_len;965 dma_addr = rxbuf->dma_addr + dma_off;966 967 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)968 type = NFDK_DESC_TX_TYPE_SIMPLE;969 else970 type = NFDK_DESC_TX_TYPE_GATHER;971 972 /* FIELD_PREP() implicitly truncates to chunk */973 dma_len -= 1;974 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,975 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?976 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |977 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);978 979 txd->dma_len_type = cpu_to_le16(dlen_type);980 nfp_desc_set_dma_addr_48b(txd, dma_addr);981 982 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;983 dma_len -= tmp_dlen;984 dma_addr += tmp_dlen + 1;985 txd++;986 987 while (dma_len > 0) {988 dma_len -= 1;989 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);990 txd->dma_len_type = cpu_to_le16(dlen_type);991 nfp_desc_set_dma_addr_48b(txd, dma_addr);992 993 dlen_type &= NFDK_DESC_TX_DMA_LEN;994 dma_len -= dlen_type;995 dma_addr += dlen_type + 1;996 txd++;997 }998 999 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);1000 1001 /* Metadata desc */1002 txd->raw = 0;1003 txd++;1004 1005 cnt = txd - tx_ring->ktxds - wr_idx;1006 tx_ring->wr_p += cnt;1007 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)1008 tx_ring->data_pending += pkt_len;1009 else1010 tx_ring->data_pending = 0;1011 1012 tx_ring->wr_ptr_add += cnt;1013 return true;1014}1015 1016/**1017 * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring1018 * @rx_ring: RX ring to receive from1019 * @budget: NAPI budget1020 *1021 * Note, this function is separated out from the napi poll function to1022 * more cleanly separate packet receive code from other bookkeeping1023 * functions performed in the napi poll function.1024 *1025 * Return: Number of packets received.1026 */1027static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget)1028{1029 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;1030 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;1031 struct nfp_net_tx_ring *tx_ring;1032 struct bpf_prog *xdp_prog;1033 bool xdp_tx_cmpl = false;1034 unsigned int true_bufsz;1035 struct sk_buff *skb;1036 int pkts_polled = 0;1037 struct xdp_buff xdp;1038 int idx;1039 1040 xdp_prog = READ_ONCE(dp->xdp_prog);1041 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;1042 xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM,1043 &rx_ring->xdp_rxq);1044 tx_ring = r_vec->xdp_ring;1045 1046 while (pkts_polled < budget) {1047 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;1048 struct nfp_net_rx_buf *rxbuf;1049 struct nfp_net_rx_desc *rxd;1050 struct nfp_meta_parsed meta;1051 bool redir_egress = false;1052 struct net_device *netdev;1053 dma_addr_t new_dma_addr;1054 u32 meta_len_xdp = 0;1055 void *new_frag;1056 1057 idx = D_IDX(rx_ring, rx_ring->rd_p);1058 1059 rxd = &rx_ring->rxds[idx];1060 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))1061 break;1062 1063 /* Memory barrier to ensure that we won't do other reads1064 * before the DD bit.1065 */1066 dma_rmb();1067 1068 memset(&meta, 0, sizeof(meta));1069 1070 rx_ring->rd_p++;1071 pkts_polled++;1072 1073 rxbuf = &rx_ring->rxbufs[idx];1074 /* < meta_len >1075 * <-- [rx_offset] -->1076 * ---------------------------------------------------------1077 * | [XX] | metadata | packet | XXXX |1078 * ---------------------------------------------------------1079 * <---------------- data_len --------------->1080 *1081 * The rx_offset is fixed for all packets, the meta_len can vary1082 * on a packet by packet basis. If rx_offset is set to zero1083 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the1084 * buffer and is immediately followed by the packet (no [XX]).1085 */1086 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;1087 data_len = le16_to_cpu(rxd->rxd.data_len);1088 pkt_len = data_len - meta_len;1089 1090 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;1091 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)1092 pkt_off += meta_len;1093 else1094 pkt_off += dp->rx_offset;1095 meta_off = pkt_off - meta_len;1096 1097 /* Stats update */1098 u64_stats_update_begin(&r_vec->rx_sync);1099 r_vec->rx_pkts++;1100 r_vec->rx_bytes += pkt_len;1101 u64_stats_update_end(&r_vec->rx_sync);1102 1103 if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||1104 (dp->rx_offset && meta_len > dp->rx_offset))) {1105 nn_dp_warn(dp, "oversized RX packet metadata %u\n",1106 meta_len);1107 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);1108 continue;1109 }1110 1111 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,1112 data_len);1113 1114 if (meta_len) {1115 if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta,1116 rxbuf->frag + meta_off,1117 rxbuf->frag + pkt_off,1118 pkt_len, meta_len))) {1119 nn_dp_warn(dp, "invalid RX packet metadata\n");1120 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,1121 NULL);1122 continue;1123 }1124 }1125 1126 if (xdp_prog && !meta.portid) {1127 void *orig_data = rxbuf->frag + pkt_off;1128 unsigned int dma_off;1129 int act;1130 1131 xdp_prepare_buff(&xdp,1132 rxbuf->frag + NFP_NET_RX_BUF_HEADROOM,1133 pkt_off - NFP_NET_RX_BUF_HEADROOM,1134 pkt_len, true);1135 1136 act = bpf_prog_run_xdp(xdp_prog, &xdp);1137 1138 pkt_len = xdp.data_end - xdp.data;1139 pkt_off += xdp.data - orig_data;1140 1141 switch (act) {1142 case XDP_PASS:1143 meta_len_xdp = xdp.data - xdp.data_meta;1144 break;1145 case XDP_TX:1146 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;1147 if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring,1148 tx_ring,1149 rxbuf,1150 dma_off,1151 pkt_len,1152 &xdp_tx_cmpl)))1153 trace_xdp_exception(dp->netdev,1154 xdp_prog, act);1155 continue;1156 default:1157 bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act);1158 fallthrough;1159 case XDP_ABORTED:1160 trace_xdp_exception(dp->netdev, xdp_prog, act);1161 fallthrough;1162 case XDP_DROP:1163 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,1164 rxbuf->dma_addr);1165 continue;1166 }1167 }1168 1169 if (likely(!meta.portid)) {1170 netdev = dp->netdev;1171 } else if (meta.portid == NFP_META_PORT_ID_CTRL) {1172 struct nfp_net *nn = netdev_priv(dp->netdev);1173 1174 nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off,1175 pkt_len);1176 nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag,1177 rxbuf->dma_addr);1178 continue;1179 } else {1180 struct nfp_net *nn;1181 1182 nn = netdev_priv(dp->netdev);1183 netdev = nfp_app_dev_get(nn->app, meta.portid,1184 &redir_egress);1185 if (unlikely(!netdev)) {1186 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf,1187 NULL);1188 continue;1189 }1190 1191 if (nfp_netdev_is_nfp_repr(netdev))1192 nfp_repr_inc_rx_stats(netdev, pkt_len);1193 }1194 1195 skb = napi_build_skb(rxbuf->frag, true_bufsz);1196 if (unlikely(!skb)) {1197 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);1198 continue;1199 }1200 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);1201 if (unlikely(!new_frag)) {1202 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);1203 continue;1204 }1205 1206 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);1207 1208 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);1209 1210 skb_reserve(skb, pkt_off);1211 skb_put(skb, pkt_len);1212 1213 skb->mark = meta.mark;1214 skb_set_hash(skb, meta.hash, meta.hash_type);1215 1216 skb_record_rx_queue(skb, rx_ring->idx);1217 skb->protocol = eth_type_trans(skb, netdev);1218 1219 nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb);1220 1221 if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) {1222 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);1223 continue;1224 }1225 1226#ifdef CONFIG_NFP_NET_IPSEC1227 if (meta.ipsec_saidx != 0 && unlikely(nfp_net_ipsec_rx(&meta, skb))) {1228 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);1229 continue;1230 }1231#endif1232 1233 if (meta_len_xdp)1234 skb_metadata_set(skb, meta_len_xdp);1235 1236 if (likely(!redir_egress)) {1237 napi_gro_receive(&rx_ring->r_vec->napi, skb);1238 } else {1239 skb->dev = netdev;1240 skb_reset_network_header(skb);1241 __skb_push(skb, ETH_HLEN);1242 dev_queue_xmit(skb);1243 }1244 }1245 1246 if (xdp_prog) {1247 if (tx_ring->wr_ptr_add)1248 nfp_net_tx_xmit_more_flush(tx_ring);1249 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&1250 !xdp_tx_cmpl)1251 if (!nfp_nfdk_xdp_complete(tx_ring))1252 pkts_polled = budget;1253 }1254 1255 return pkts_polled;1256}1257 1258/**1259 * nfp_nfdk_poll() - napi poll function1260 * @napi: NAPI structure1261 * @budget: NAPI budget1262 *1263 * Return: number of packets polled.1264 */1265int nfp_nfdk_poll(struct napi_struct *napi, int budget)1266{1267 struct nfp_net_r_vector *r_vec =1268 container_of(napi, struct nfp_net_r_vector, napi);1269 unsigned int pkts_polled = 0;1270 1271 if (r_vec->tx_ring)1272 nfp_nfdk_tx_complete(r_vec->tx_ring, budget);1273 if (r_vec->rx_ring)1274 pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget);1275 1276 if (pkts_polled < budget)1277 if (napi_complete_done(napi, pkts_polled))1278 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);1279 1280 if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) {1281 struct dim_sample dim_sample = {};1282 unsigned int start;1283 u64 pkts, bytes;1284 1285 do {1286 start = u64_stats_fetch_begin(&r_vec->rx_sync);1287 pkts = r_vec->rx_pkts;1288 bytes = r_vec->rx_bytes;1289 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));1290 1291 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);1292 net_dim(&r_vec->rx_dim, dim_sample);1293 }1294 1295 if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {1296 struct dim_sample dim_sample = {};1297 unsigned int start;1298 u64 pkts, bytes;1299 1300 do {1301 start = u64_stats_fetch_begin(&r_vec->tx_sync);1302 pkts = r_vec->tx_pkts;1303 bytes = r_vec->tx_bytes;1304 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));1305 1306 dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);1307 net_dim(&r_vec->tx_dim, dim_sample);1308 }1309 1310 return pkts_polled;1311}1312 1313/* Control device data path1314 */1315 1316bool1317nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,1318 struct sk_buff *skb, bool old)1319{1320 u32 cnt, tmp_dlen, dlen_type = 0;1321 struct nfp_net_tx_ring *tx_ring;1322 struct nfp_nfdk_tx_buf *txbuf;1323 struct nfp_nfdk_tx_desc *txd;1324 unsigned int dma_len, type;1325 struct nfp_net_dp *dp;1326 dma_addr_t dma_addr;1327 u64 metadata = 0;1328 int wr_idx;1329 1330 dp = &r_vec->nfp_net->dp;1331 tx_ring = r_vec->tx_ring;1332 1333 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {1334 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");1335 goto err_free;1336 }1337 1338 /* Don't bother counting frags, assume the worst */1339 if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {1340 u64_stats_update_begin(&r_vec->tx_sync);1341 r_vec->tx_busy++;1342 u64_stats_update_end(&r_vec->tx_sync);1343 if (!old)1344 __skb_queue_tail(&r_vec->queue, skb);1345 else1346 __skb_queue_head(&r_vec->queue, skb);1347 return NETDEV_TX_BUSY;1348 }1349 1350 if (nfp_app_ctrl_has_meta(nn->app)) {1351 if (unlikely(skb_headroom(skb) < 8)) {1352 nn_dp_warn(dp, "CTRL TX on skb without headroom\n");1353 goto err_free;1354 }1355 metadata = NFDK_DESC_TX_CHAIN_META;1356 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));1357 put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) |1358 FIELD_PREP(NFDK_META_FIELDS,1359 NFP_NET_META_PORTID),1360 skb_push(skb, 4));1361 }1362 1363 if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))1364 goto err_free;1365 1366 /* DMA map all */1367 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);1368 txd = &tx_ring->ktxds[wr_idx];1369 txbuf = &tx_ring->ktxbufs[wr_idx];1370 1371 dma_len = skb_headlen(skb);1372 if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)1373 type = NFDK_DESC_TX_TYPE_SIMPLE;1374 else1375 type = NFDK_DESC_TX_TYPE_GATHER;1376 1377 dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);1378 if (dma_mapping_error(dp->dev, dma_addr))1379 goto err_warn_dma;1380 1381 txbuf->skb = skb;1382 txbuf++;1383 1384 txbuf->dma_addr = dma_addr;1385 txbuf++;1386 1387 dma_len -= 1;1388 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,1389 dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?1390 NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |1391 FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);1392 1393 txd->dma_len_type = cpu_to_le16(dlen_type);1394 nfp_desc_set_dma_addr_48b(txd, dma_addr);1395 1396 tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;1397 dma_len -= tmp_dlen;1398 dma_addr += tmp_dlen + 1;1399 txd++;1400 1401 while (dma_len > 0) {1402 dma_len -= 1;1403 dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);1404 txd->dma_len_type = cpu_to_le16(dlen_type);1405 nfp_desc_set_dma_addr_48b(txd, dma_addr);1406 1407 dlen_type &= NFDK_DESC_TX_DMA_LEN;1408 dma_len -= dlen_type;1409 dma_addr += dlen_type + 1;1410 txd++;1411 }1412 1413 (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);1414 1415 /* Metadata desc */1416 txd->raw = cpu_to_le64(metadata);1417 txd++;1418 1419 cnt = txd - tx_ring->ktxds - wr_idx;1420 if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=1421 round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))1422 goto err_warn_overflow;1423 1424 tx_ring->wr_p += cnt;1425 if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)1426 tx_ring->data_pending += skb->len;1427 else1428 tx_ring->data_pending = 0;1429 1430 tx_ring->wr_ptr_add += cnt;1431 nfp_net_tx_xmit_more_flush(tx_ring);1432 1433 return NETDEV_TX_OK;1434 1435err_warn_overflow:1436 WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",1437 wr_idx, skb_headlen(skb), 0, cnt);1438 txbuf--;1439 dma_unmap_single(dp->dev, txbuf->dma_addr,1440 skb_headlen(skb), DMA_TO_DEVICE);1441 txbuf->raw = 0;1442err_warn_dma:1443 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");1444err_free:1445 u64_stats_update_begin(&r_vec->tx_sync);1446 r_vec->tx_errors++;1447 u64_stats_update_end(&r_vec->tx_sync);1448 dev_kfree_skb_any(skb);1449 return NETDEV_TX_OK;1450}1451 1452static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)1453{1454 struct sk_buff *skb;1455 1456 while ((skb = __skb_dequeue(&r_vec->queue)))1457 if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))1458 return;1459}1460 1461static bool1462nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)1463{1464 u32 meta_type, meta_tag;1465 1466 if (!nfp_app_ctrl_has_meta(nn->app))1467 return !meta_len;1468 1469 if (meta_len != 8)1470 return false;1471 1472 meta_type = get_unaligned_be32(data);1473 meta_tag = get_unaligned_be32(data + 4);1474 1475 return (meta_type == NFP_NET_META_PORTID &&1476 meta_tag == NFP_META_PORT_ID_CTRL);1477}1478 1479static bool1480nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,1481 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)1482{1483 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;1484 struct nfp_net_rx_buf *rxbuf;1485 struct nfp_net_rx_desc *rxd;1486 dma_addr_t new_dma_addr;1487 struct sk_buff *skb;1488 void *new_frag;1489 int idx;1490 1491 idx = D_IDX(rx_ring, rx_ring->rd_p);1492 1493 rxd = &rx_ring->rxds[idx];1494 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))1495 return false;1496 1497 /* Memory barrier to ensure that we won't do other reads1498 * before the DD bit.1499 */1500 dma_rmb();1501 1502 rx_ring->rd_p++;1503 1504 rxbuf = &rx_ring->rxbufs[idx];1505 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;1506 data_len = le16_to_cpu(rxd->rxd.data_len);1507 pkt_len = data_len - meta_len;1508 1509 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;1510 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)1511 pkt_off += meta_len;1512 else1513 pkt_off += dp->rx_offset;1514 meta_off = pkt_off - meta_len;1515 1516 /* Stats update */1517 u64_stats_update_begin(&r_vec->rx_sync);1518 r_vec->rx_pkts++;1519 r_vec->rx_bytes += pkt_len;1520 u64_stats_update_end(&r_vec->rx_sync);1521 1522 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);1523 1524 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {1525 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",1526 meta_len);1527 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);1528 return true;1529 }1530 1531 skb = build_skb(rxbuf->frag, dp->fl_bufsz);1532 if (unlikely(!skb)) {1533 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);1534 return true;1535 }1536 new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);1537 if (unlikely(!new_frag)) {1538 nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);1539 return true;1540 }1541 1542 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);1543 1544 nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);1545 1546 skb_reserve(skb, pkt_off);1547 skb_put(skb, pkt_len);1548 1549 nfp_app_ctrl_rx(nn->app, skb);1550 1551 return true;1552}1553 1554static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)1555{1556 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;1557 struct nfp_net *nn = r_vec->nfp_net;1558 struct nfp_net_dp *dp = &nn->dp;1559 unsigned int budget = 512;1560 1561 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--)1562 continue;1563 1564 return budget;1565}1566 1567void nfp_nfdk_ctrl_poll(struct tasklet_struct *t)1568{1569 struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet);1570 1571 spin_lock(&r_vec->lock);1572 nfp_nfdk_tx_complete(r_vec->tx_ring, 0);1573 __nfp_ctrl_tx_queued(r_vec);1574 spin_unlock(&r_vec->lock);1575 1576 if (nfp_ctrl_rx(r_vec)) {1577 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);1578 } else {1579 tasklet_schedule(&r_vec->tasklet);1580 nn_dp_warn(&r_vec->nfp_net->dp,1581 "control message budget exceeded!\n");1582 }1583}1584