diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfdk/dp.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfdk/dp.c | 1524 |
1 files changed, 1524 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c new file mode 100644 index 000000000000..e3da9ac20e57 --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c @@ -0,0 +1,1524 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +/* Copyright (C) 2015-2019 Netronome Systems, Inc. */ + +#include <linux/bpf_trace.h> +#include <linux/netdevice.h> +#include <linux/overflow.h> +#include <linux/sizes.h> +#include <linux/bitfield.h> + +#include "../nfp_app.h" +#include "../nfp_net.h" +#include "../nfp_net_dp.h" +#include "../crypto/crypto.h" +#include "../crypto/fw.h" +#include "nfdk.h" + +static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) +{ + return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2); +} + +static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) +{ + return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT); +} + +static void nfp_nfdk_tx_ring_stop(struct netdev_queue *nd_q, + struct nfp_net_tx_ring *tx_ring) +{ + netif_tx_stop_queue(nd_q); + + /* We can race with the TX completion out of NAPI so recheck */ + smp_mb(); + if (unlikely(nfp_nfdk_tx_ring_should_wake(tx_ring))) + netif_tx_start_queue(nd_q); +} + +static __le64 +nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf, + struct sk_buff *skb) +{ + u32 segs, hdrlen, l3_offset, l4_offset; + struct nfp_nfdk_tx_desc txd; + u16 mss; + + if (!skb->encapsulation) { + l3_offset = skb_network_offset(skb); + l4_offset = skb_transport_offset(skb); + hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); + } else { + l3_offset = skb_inner_network_offset(skb); + l4_offset = skb_inner_transport_offset(skb); + hdrlen = skb_inner_transport_header(skb) - skb->data + + inner_tcp_hdrlen(skb); + } + + segs = skb_shinfo(skb)->gso_segs; + mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK; + + /* Note: TSO of the packet with metadata prepended to skb is not + * supported yet, in which case l3/l4_offset and lso_hdrlen need + * be correctly handled here. + * Concern: + * The driver doesn't have md_bytes easily available at this point. + * The PCI.IN PD ME won't have md_bytes bytes to add to lso_hdrlen, + * so it needs the full length there. The app MEs might prefer + * l3_offset and l4_offset relative to the start of packet data, + * but could probably cope with it being relative to the CTM buf + * data offset. + */ + txd.l3_offset = l3_offset; + txd.l4_offset = l4_offset; + txd.lso_meta_res = 0; + txd.mss = cpu_to_le16(mss); + txd.lso_hdrlen = hdrlen; + txd.lso_totsegs = segs; + + txbuf->pkt_cnt = segs; + txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1); + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_lso++; + u64_stats_update_end(&r_vec->tx_sync); + + return txd.raw; +} + +static u8 +nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, + unsigned int pkt_cnt, struct sk_buff *skb, u64 flags) +{ + struct ipv6hdr *ipv6h; + struct iphdr *iph; + + if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) + return flags; + + if (skb->ip_summed != CHECKSUM_PARTIAL) + return flags; + + flags |= NFDK_DESC_TX_L4_CSUM; + + iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); + ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); + + /* L3 checksum offloading flag is not required for ipv6 */ + if (iph->version == 4) { + flags |= NFDK_DESC_TX_L3_CSUM; + } else if (ipv6h->version != 6) { + nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); + return flags; + } + + u64_stats_update_begin(&r_vec->tx_sync); + if (!skb->encapsulation) { + r_vec->hw_csum_tx += pkt_cnt; + } else { + flags |= NFDK_DESC_TX_ENCAP; + r_vec->hw_csum_tx_inner += pkt_cnt; + } + u64_stats_update_end(&r_vec->tx_sync); + + return flags; +} + +static int +nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring, + unsigned int nr_frags, struct sk_buff *skb) +{ + unsigned int n_descs, wr_p, nop_slots; + const skb_frag_t *frag, *fend; + struct nfp_nfdk_tx_desc *txd; + unsigned int wr_idx; + int err; + +recount_descs: + n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb)); + + frag = skb_shinfo(skb)->frags; + fend = frag + nr_frags; + for (; frag < fend; frag++) + n_descs += DIV_ROUND_UP(skb_frag_size(frag), + NFDK_TX_MAX_DATA_PER_DESC); + + if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) { + if (skb_is_nonlinear(skb)) { + err = skb_linearize(skb); + if (err) + return err; + goto recount_descs; + } + return -EINVAL; + } + + /* Under count by 1 (don't count meta) for the round down to work out */ + n_descs += !!skb_is_gso(skb); + + if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != + round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) + goto close_block; + + if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK) + goto close_block; + + return 0; + +close_block: + wr_p = tx_ring->wr_p; + nop_slots = D_BLOCK_CPL(wr_p); + + wr_idx = D_IDX(tx_ring, wr_p); + tx_ring->ktxbufs[wr_idx].skb = NULL; + txd = &tx_ring->ktxds[wr_idx]; + + memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); + + tx_ring->data_pending = 0; + tx_ring->wr_p += nop_slots; + tx_ring->wr_ptr_add += nop_slots; + + return 0; +} + +static int nfp_nfdk_prep_port_id(struct sk_buff *skb) +{ + struct metadata_dst *md_dst = skb_metadata_dst(skb); + unsigned char *data; + + if (likely(!md_dst)) + return 0; + if (unlikely(md_dst->type != METADATA_HW_PORT_MUX)) + return 0; + + /* Note: Unsupported case when TSO a skb with metedata prepended. + * See the comments in `nfp_nfdk_tx_tso` for details. + */ + if (unlikely(md_dst && skb_is_gso(skb))) + return -EOPNOTSUPP; + + if (unlikely(skb_cow_head(skb, sizeof(md_dst->u.port_info.port_id)))) + return -ENOMEM; + + data = skb_push(skb, sizeof(md_dst->u.port_info.port_id)); + put_unaligned_be32(md_dst->u.port_info.port_id, data); + + return sizeof(md_dst->u.port_info.port_id); +} + +static int +nfp_nfdk_prep_tx_meta(struct nfp_app *app, struct sk_buff *skb, + struct nfp_net_r_vector *r_vec) +{ + unsigned char *data; + int res, md_bytes; + u32 meta_id = 0; + + res = nfp_nfdk_prep_port_id(skb); + if (unlikely(res <= 0)) + return res; + + md_bytes = res; + meta_id = NFP_NET_META_PORTID; + + if (unlikely(skb_cow_head(skb, sizeof(meta_id)))) + return -ENOMEM; + + md_bytes += sizeof(meta_id); + + meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) | + FIELD_PREP(NFDK_META_FIELDS, meta_id); + + data = skb_push(skb, sizeof(meta_id)); + put_unaligned_be32(meta_id, data); + + return NFDK_DESC_TX_CHAIN_META; +} + +/** + * nfp_nfdk_tx() - Main transmit entry point + * @skb: SKB to transmit + * @netdev: netdev structure + * + * Return: NETDEV_TX_OK on success. + */ +netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + struct nfp_nfdk_tx_buf *txbuf, *etxbuf; + u32 cnt, tmp_dlen, dlen_type = 0; + struct nfp_net_tx_ring *tx_ring; + struct nfp_net_r_vector *r_vec; + const skb_frag_t *frag, *fend; + struct nfp_nfdk_tx_desc *txd; + unsigned int real_len, qidx; + unsigned int dma_len, type; + struct netdev_queue *nd_q; + struct nfp_net_dp *dp; + int nr_frags, wr_idx; + dma_addr_t dma_addr; + u64 metadata; + + dp = &nn->dp; + qidx = skb_get_queue_mapping(skb); + tx_ring = &dp->tx_rings[qidx]; + r_vec = tx_ring->r_vec; + nd_q = netdev_get_tx_queue(dp->netdev, qidx); + + /* Don't bother counting frags, assume the worst */ + if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { + nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", + qidx, tx_ring->wr_p, tx_ring->rd_p); + netif_tx_stop_queue(nd_q); + nfp_net_tx_xmit_more_flush(tx_ring); + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_busy++; + u64_stats_update_end(&r_vec->tx_sync); + return NETDEV_TX_BUSY; + } + + metadata = nfp_nfdk_prep_tx_meta(nn->app, skb, r_vec); + if (unlikely((int)metadata < 0)) + goto err_flush; + + nr_frags = skb_shinfo(skb)->nr_frags; + if (nfp_nfdk_tx_maybe_close_block(tx_ring, nr_frags, skb)) + goto err_flush; + + /* DMA map all */ + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + txd = &tx_ring->ktxds[wr_idx]; + txbuf = &tx_ring->ktxbufs[wr_idx]; + + dma_len = skb_headlen(skb); + if (skb_is_gso(skb)) + type = NFDK_DESC_TX_TYPE_TSO; + else if (!nr_frags && dma_len < NFDK_TX_MAX_DATA_PER_HEAD) + type = NFDK_DESC_TX_TYPE_SIMPLE; + else + type = NFDK_DESC_TX_TYPE_GATHER; + + dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_warn_dma; + + txbuf->skb = skb; + txbuf++; + + txbuf->dma_addr = dma_addr; + txbuf++; + + /* FIELD_PREP() implicitly truncates to chunk */ + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | + FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); + + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + /* starts at bit 0 */ + BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1)); + + /* Preserve the original dlen_type, this way below the EOP logic + * can use dlen_type. + */ + tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; + dma_len -= tmp_dlen; + dma_addr += tmp_dlen + 1; + txd++; + + /* The rest of the data (if any) will be in larger dma descritors + * and is handled with the fragment loop. + */ + frag = skb_shinfo(skb)->frags; + fend = frag + nr_frags; + + while (true) { + while (dma_len > 0) { + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); + + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + dma_len -= dlen_type; + dma_addr += dlen_type + 1; + txd++; + } + + if (frag >= fend) + break; + + dma_len = skb_frag_size(frag); + dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len, + DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_unmap; + + txbuf->dma_addr = dma_addr; + txbuf++; + + frag++; + } + + (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); + + if (!skb_is_gso(skb)) { + real_len = skb->len; + /* Metadata desc */ + metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata); + txd->raw = cpu_to_le64(metadata); + txd++; + } else { + /* lso desc should be placed after metadata desc */ + (txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb); + real_len = txbuf->real_len; + /* Metadata desc */ + metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata); + txd->raw = cpu_to_le64(metadata); + txd += 2; + txbuf++; + } + + cnt = txd - tx_ring->ktxds - wr_idx; + if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != + round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) + goto err_warn_overflow; + + skb_tx_timestamp(skb); + + tx_ring->wr_p += cnt; + if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) + tx_ring->data_pending += skb->len; + else + tx_ring->data_pending = 0; + + if (nfp_nfdk_tx_ring_should_stop(tx_ring)) + nfp_nfdk_tx_ring_stop(nd_q, tx_ring); + + tx_ring->wr_ptr_add += cnt; + if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more())) + nfp_net_tx_xmit_more_flush(tx_ring); + + return NETDEV_TX_OK; + +err_warn_overflow: + WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", + wr_idx, skb_headlen(skb), nr_frags, cnt); + if (skb_is_gso(skb)) + txbuf--; +err_unmap: + /* txbuf pointed to the next-to-use */ + etxbuf = txbuf; + /* first txbuf holds the skb */ + txbuf = &tx_ring->ktxbufs[wr_idx + 1]; + if (txbuf < etxbuf) { + dma_unmap_single(dp->dev, txbuf->dma_addr, + skb_headlen(skb), DMA_TO_DEVICE); + txbuf->raw = 0; + txbuf++; + } + frag = skb_shinfo(skb)->frags; + while (etxbuf < txbuf) { + dma_unmap_page(dp->dev, txbuf->dma_addr, + skb_frag_size(frag), DMA_TO_DEVICE); + txbuf->raw = 0; + frag++; + txbuf++; + } +err_warn_dma: + nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); +err_flush: + nfp_net_tx_xmit_more_flush(tx_ring); + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_errors++; + u64_stats_update_end(&r_vec->tx_sync); + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +/** + * nfp_nfdk_tx_complete() - Handled completed TX packets + * @tx_ring: TX ring structure + * @budget: NAPI budget (only used as bool to determine if in NAPI context) + */ +static void nfp_nfdk_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + u32 done_pkts = 0, done_bytes = 0; + struct nfp_nfdk_tx_buf *ktxbufs; + struct device *dev = dp->dev; + struct netdev_queue *nd_q; + u32 rd_p, qcp_rd_p; + int todo; + + rd_p = tx_ring->rd_p; + if (tx_ring->wr_p == rd_p) + return; + + /* Work out how many descriptors have been transmitted */ + qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); + + if (qcp_rd_p == tx_ring->qcp_rd_p) + return; + + todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); + ktxbufs = tx_ring->ktxbufs; + + while (todo > 0) { + const skb_frag_t *frag, *fend; + unsigned int size, n_descs = 1; + struct nfp_nfdk_tx_buf *txbuf; + struct sk_buff *skb; + + txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)]; + skb = txbuf->skb; + txbuf++; + + /* Closed block */ + if (!skb) { + n_descs = D_BLOCK_CPL(rd_p); + goto next; + } + + /* Unmap head */ + size = skb_headlen(skb); + n_descs += nfp_nfdk_headlen_to_segs(size); + dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE); + txbuf++; + + /* Unmap frags */ + frag = skb_shinfo(skb)->frags; + fend = frag + skb_shinfo(skb)->nr_frags; + for (; frag < fend; frag++) { + size = skb_frag_size(frag); + n_descs += DIV_ROUND_UP(size, + NFDK_TX_MAX_DATA_PER_DESC); + dma_unmap_page(dev, txbuf->dma_addr, + skb_frag_size(frag), DMA_TO_DEVICE); + txbuf++; + } + + if (!skb_is_gso(skb)) { + done_bytes += skb->len; + done_pkts++; + } else { + done_bytes += txbuf->real_len; + done_pkts += txbuf->pkt_cnt; + n_descs++; + } + + napi_consume_skb(skb, budget); +next: + rd_p += n_descs; + todo -= n_descs; + } + + tx_ring->rd_p = rd_p; + tx_ring->qcp_rd_p = qcp_rd_p; + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_bytes += done_bytes; + r_vec->tx_pkts += done_pkts; + u64_stats_update_end(&r_vec->tx_sync); + + if (!dp->netdev) + return; + + nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); + netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); + if (nfp_nfdk_tx_ring_should_wake(tx_ring)) { + /* Make sure TX thread will see updated tx_ring->rd_p */ + smp_mb(); + + if (unlikely(netif_tx_queue_stopped(nd_q))) + netif_tx_wake_queue(nd_q); + } + + WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, + "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", + tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); +} + +/* Receive processing */ +static void * +nfp_nfdk_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) +{ + void *frag; + + if (!dp->xdp_prog) { + frag = napi_alloc_frag(dp->fl_bufsz); + if (unlikely(!frag)) + return NULL; + } else { + struct page *page; + + page = dev_alloc_page(); + if (unlikely(!page)) + return NULL; + frag = page_address(page); + } + + *dma_addr = nfp_net_dma_map_rx(dp, frag); + if (dma_mapping_error(dp->dev, *dma_addr)) { + nfp_net_free_frag(frag, dp->xdp_prog); + nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); + return NULL; + } + + return frag; +} + +/** + * nfp_nfdk_rx_give_one() - Put mapped skb on the software and hardware rings + * @dp: NFP Net data path struct + * @rx_ring: RX ring structure + * @frag: page fragment buffer + * @dma_addr: DMA address of skb mapping + */ +static void +nfp_nfdk_rx_give_one(const struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring, + void *frag, dma_addr_t dma_addr) +{ + unsigned int wr_idx; + + wr_idx = D_IDX(rx_ring, rx_ring->wr_p); + + nfp_net_dma_sync_dev_rx(dp, dma_addr); + + /* Stash SKB and DMA address away */ + rx_ring->rxbufs[wr_idx].frag = frag; + rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; + + /* Fill freelist descriptor */ + rx_ring->rxds[wr_idx].fld.reserved = 0; + rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; + nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld, + dma_addr + dp->rx_dma_off); + + rx_ring->wr_p++; + if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { + /* Update write pointer of the freelist queue. Make + * sure all writes are flushed before telling the hardware. + */ + wmb(); + nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); + } +} + +/** + * nfp_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW + * @dp: NFP Net data path struct + * @rx_ring: RX ring to fill + */ +void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring) +{ + unsigned int i; + + for (i = 0; i < rx_ring->cnt - 1; i++) + nfp_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, + rx_ring->rxbufs[i].dma_addr); +} + +/** + * nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors + * @flags: RX descriptor flags field in CPU byte order + */ +static int nfp_nfdk_rx_csum_has_errors(u16 flags) +{ + u16 csum_all_checked, csum_all_ok; + + csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; + csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; + + return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); +} + +/** + * nfp_nfdk_rx_csum() - set SKB checksum field based on RX descriptor flags + * @dp: NFP Net data path struct + * @r_vec: per-ring structure + * @rxd: Pointer to RX descriptor + * @meta: Parsed metadata prepend + * @skb: Pointer to SKB + */ +static void +nfp_nfdk_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, + struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta, + struct sk_buff *skb) +{ + skb_checksum_none_assert(skb); + + if (!(dp->netdev->features & NETIF_F_RXCSUM)) + return; + + if (meta->csum_type) { + skb->ip_summed = meta->csum_type; + skb->csum = meta->csum; + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_complete++; + u64_stats_update_end(&r_vec->rx_sync); + return; + } + + if (nfp_nfdk_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_error++; + u64_stats_update_end(&r_vec->rx_sync); + return; + } + + /* Assume that the firmware will never report inner CSUM_OK unless outer + * L4 headers were successfully parsed. FW will always report zero UDP + * checksum as CSUM_OK. + */ + if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || + rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { + __skb_incr_checksum_unnecessary(skb); + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_ok++; + u64_stats_update_end(&r_vec->rx_sync); + } + + if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || + rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { + __skb_incr_checksum_unnecessary(skb); + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_inner_ok++; + u64_stats_update_end(&r_vec->rx_sync); + } +} + +static void +nfp_nfdk_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, + unsigned int type, __be32 *hash) +{ + if (!(netdev->features & NETIF_F_RXHASH)) + return; + + switch (type) { + case NFP_NET_RSS_IPV4: + case NFP_NET_RSS_IPV6: + case NFP_NET_RSS_IPV6_EX: + meta->hash_type = PKT_HASH_TYPE_L3; + break; + default: + meta->hash_type = PKT_HASH_TYPE_L4; + break; + } + + meta->hash = get_unaligned_be32(hash); +} + +static bool +nfp_nfdk_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, + void *data, void *pkt, unsigned int pkt_len, int meta_len) +{ + u32 meta_info; + + meta_info = get_unaligned_be32(data); + data += 4; + + while (meta_info) { + switch (meta_info & NFP_NET_META_FIELD_MASK) { + case NFP_NET_META_HASH: + meta_info >>= NFP_NET_META_FIELD_SIZE; + nfp_nfdk_set_hash(netdev, meta, + meta_info & NFP_NET_META_FIELD_MASK, + (__be32 *)data); + data += 4; + break; + case NFP_NET_META_MARK: + meta->mark = get_unaligned_be32(data); + data += 4; + break; + case NFP_NET_META_PORTID: + meta->portid = get_unaligned_be32(data); + data += 4; + break; + case NFP_NET_META_CSUM: + meta->csum_type = CHECKSUM_COMPLETE; + meta->csum = + (__force __wsum)__get_unaligned_cpu32(data); + data += 4; + break; + case NFP_NET_META_RESYNC_INFO: + if (nfp_net_tls_rx_resync_req(netdev, data, pkt, + pkt_len)) + return false; + data += sizeof(struct nfp_net_tls_resync_req); + break; + default: + return true; + } + + meta_info >>= NFP_NET_META_FIELD_SIZE; + } + + return data != pkt; +} + +static void +nfp_nfdk_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, + struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, + struct sk_buff *skb) +{ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_drops++; + /* If we have both skb and rxbuf the replacement buffer allocation + * must have failed, count this as an alloc failure. + */ + if (skb && rxbuf) + r_vec->rx_replace_buf_alloc_fail++; + u64_stats_update_end(&r_vec->rx_sync); + + /* skb is build based on the frag, free_skb() would free the frag + * so to be able to reuse it we need an extra ref. + */ + if (skb && rxbuf && skb->head == rxbuf->frag) + page_ref_inc(virt_to_head_page(rxbuf->frag)); + if (rxbuf) + nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); + if (skb) + dev_kfree_skb_any(skb); +} + +static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + struct nfp_net_rx_ring *rx_ring; + u32 qcp_rd_p, done = 0; + bool done_all; + int todo; + + /* Work out how many descriptors have been transmitted */ + qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp); + if (qcp_rd_p == tx_ring->qcp_rd_p) + return true; + + todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); + + done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; + todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); + + rx_ring = r_vec->rx_ring; + while (todo > 0) { + int idx = D_IDX(tx_ring, tx_ring->rd_p + done); + struct nfp_nfdk_tx_buf *txbuf; + unsigned int step = 1; + + txbuf = &tx_ring->ktxbufs[idx]; + if (!txbuf->raw) + goto next; + + if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) { + WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n"); + goto next; + } + + /* Two successive txbufs are used to stash virtual and dma + * address respectively, recycle and clean them here. + */ + nfp_nfdk_rx_give_one(dp, rx_ring, + (void *)NFDK_TX_BUF_PTR(txbuf[0].val), + txbuf[1].dma_addr); + txbuf[0].raw = 0; + txbuf[1].raw = 0; + step = 2; + + u64_stats_update_begin(&r_vec->tx_sync); + /* Note: tx_bytes not accumulated. */ + r_vec->tx_pkts++; + u64_stats_update_end(&r_vec->tx_sync); +next: + todo -= step; + done += step; + } + + tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done); + tx_ring->rd_p += done; + + WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, + "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", + tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); + + return done_all; +} + +static bool +nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, + struct nfp_net_tx_ring *tx_ring, + struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, + unsigned int pkt_len, bool *completed) +{ + unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; + unsigned int dma_len, type, cnt, dlen_type, tmp_dlen; + struct nfp_nfdk_tx_buf *txbuf; + struct nfp_nfdk_tx_desc *txd; + unsigned int n_descs; + dma_addr_t dma_addr; + int wr_idx; + + /* Reject if xdp_adjust_tail grow packet beyond DMA area */ + if (pkt_len + dma_off > dma_map_sz) + return false; + + /* Make sure there's still at least one block available after + * aligning to block boundary, so that the txds used below + * won't wrap around the tx_ring. + */ + if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { + if (!*completed) { + nfp_nfdk_xdp_complete(tx_ring); + *completed = true; + } + + if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { + nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, + NULL); + return false; + } + } + + /* Check if cross block boundary */ + n_descs = nfp_nfdk_headlen_to_segs(pkt_len); + if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) != + round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) || + ((u32)tx_ring->data_pending + pkt_len > + NFDK_TX_MAX_DATA_PER_BLOCK)) { + unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p); + + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + txd = &tx_ring->ktxds[wr_idx]; + memset(txd, 0, + array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc))); + + tx_ring->data_pending = 0; + tx_ring->wr_p += nop_slots; + tx_ring->wr_ptr_add += nop_slots; + } + + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + + txbuf = &tx_ring->ktxbufs[wr_idx]; + + txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP; + txbuf[1].dma_addr = rxbuf->dma_addr; + /* Note: pkt len not stored */ + + dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, + pkt_len, DMA_BIDIRECTIONAL); + + /* Build TX descriptor */ + txd = &tx_ring->ktxds[wr_idx]; + dma_len = pkt_len; + dma_addr = rxbuf->dma_addr + dma_off; + + if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD) + type = NFDK_DESC_TX_TYPE_SIMPLE; + else + type = NFDK_DESC_TX_TYPE_GATHER; + + /* FIELD_PREP() implicitly truncates to chunk */ + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | + FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); + + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; + dma_len -= tmp_dlen; + dma_addr += tmp_dlen + 1; + txd++; + + while (dma_len > 0) { + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + dlen_type &= NFDK_DESC_TX_DMA_LEN; + dma_len -= dlen_type; + dma_addr += dlen_type + 1; + txd++; + } + + (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); + + /* Metadata desc */ + txd->raw = 0; + txd++; + + cnt = txd - tx_ring->ktxds - wr_idx; + tx_ring->wr_p += cnt; + if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) + tx_ring->data_pending += pkt_len; + else + tx_ring->data_pending = 0; + + tx_ring->wr_ptr_add += cnt; + return true; +} + +/** + * nfp_nfdk_rx() - receive up to @budget packets on @rx_ring + * @rx_ring: RX ring to receive from + * @budget: NAPI budget + * + * Note, this function is separated out from the napi poll function to + * more cleanly separate packet receive code from other bookkeeping + * functions performed in the napi poll function. + * + * Return: Number of packets received. + */ +static int nfp_nfdk_rx(struct nfp_net_rx_ring *rx_ring, int budget) +{ + struct nfp_net_r_vector *r_vec = rx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + struct nfp_net_tx_ring *tx_ring; + struct bpf_prog *xdp_prog; + bool xdp_tx_cmpl = false; + unsigned int true_bufsz; + struct sk_buff *skb; + int pkts_polled = 0; + struct xdp_buff xdp; + int idx; + + xdp_prog = READ_ONCE(dp->xdp_prog); + true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; + xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, + &rx_ring->xdp_rxq); + tx_ring = r_vec->xdp_ring; + + while (pkts_polled < budget) { + unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; + struct nfp_net_rx_buf *rxbuf; + struct nfp_net_rx_desc *rxd; + struct nfp_meta_parsed meta; + bool redir_egress = false; + struct net_device *netdev; + dma_addr_t new_dma_addr; + u32 meta_len_xdp = 0; + void *new_frag; + + idx = D_IDX(rx_ring, rx_ring->rd_p); + + rxd = &rx_ring->rxds[idx]; + if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) + break; + + /* Memory barrier to ensure that we won't do other reads + * before the DD bit. + */ + dma_rmb(); + + memset(&meta, 0, sizeof(meta)); + + rx_ring->rd_p++; + pkts_polled++; + + rxbuf = &rx_ring->rxbufs[idx]; + /* < meta_len > + * <-- [rx_offset] --> + * --------------------------------------------------------- + * | [XX] | metadata | packet | XXXX | + * --------------------------------------------------------- + * <---------------- data_len ---------------> + * + * The rx_offset is fixed for all packets, the meta_len can vary + * on a packet by packet basis. If rx_offset is set to zero + * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the + * buffer and is immediately followed by the packet (no [XX]). + */ + meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; + data_len = le16_to_cpu(rxd->rxd.data_len); + pkt_len = data_len - meta_len; + + pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; + if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) + pkt_off += meta_len; + else + pkt_off += dp->rx_offset; + meta_off = pkt_off - meta_len; + + /* Stats update */ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_pkts++; + r_vec->rx_bytes += pkt_len; + u64_stats_update_end(&r_vec->rx_sync); + + if (unlikely(meta_len > NFP_NET_MAX_PREPEND || + (dp->rx_offset && meta_len > dp->rx_offset))) { + nn_dp_warn(dp, "oversized RX packet metadata %u\n", + meta_len); + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + continue; + } + + nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, + data_len); + + if (meta_len) { + if (unlikely(nfp_nfdk_parse_meta(dp->netdev, &meta, + rxbuf->frag + meta_off, + rxbuf->frag + pkt_off, + pkt_len, meta_len))) { + nn_dp_warn(dp, "invalid RX packet metadata\n"); + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, + NULL); + continue; + } + } + + if (xdp_prog && !meta.portid) { + void *orig_data = rxbuf->frag + pkt_off; + unsigned int dma_off; + int act; + + xdp_prepare_buff(&xdp, + rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, + pkt_off - NFP_NET_RX_BUF_HEADROOM, + pkt_len, true); + + act = bpf_prog_run_xdp(xdp_prog, &xdp); + + pkt_len = xdp.data_end - xdp.data; + pkt_off += xdp.data - orig_data; + + switch (act) { + case XDP_PASS: + meta_len_xdp = xdp.data - xdp.data_meta; + break; + case XDP_TX: + dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; + if (unlikely(!nfp_nfdk_tx_xdp_buf(dp, rx_ring, + tx_ring, + rxbuf, + dma_off, + pkt_len, + &xdp_tx_cmpl))) + trace_xdp_exception(dp->netdev, + xdp_prog, act); + continue; + default: + bpf_warn_invalid_xdp_action(dp->netdev, xdp_prog, act); + fallthrough; + case XDP_ABORTED: + trace_xdp_exception(dp->netdev, xdp_prog, act); + fallthrough; + case XDP_DROP: + nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, + rxbuf->dma_addr); + continue; + } + } + + if (likely(!meta.portid)) { + netdev = dp->netdev; + } else if (meta.portid == NFP_META_PORT_ID_CTRL) { + struct nfp_net *nn = netdev_priv(dp->netdev); + + nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, + pkt_len); + nfp_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, + rxbuf->dma_addr); + continue; + } else { + struct nfp_net *nn; + + nn = netdev_priv(dp->netdev); + netdev = nfp_app_dev_get(nn->app, meta.portid, + &redir_egress); + if (unlikely(!netdev)) { + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, + NULL); + continue; + } + + if (nfp_netdev_is_nfp_repr(netdev)) + nfp_repr_inc_rx_stats(netdev, pkt_len); + } + + skb = build_skb(rxbuf->frag, true_bufsz); + if (unlikely(!skb)) { + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + continue; + } + new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); + if (unlikely(!new_frag)) { + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); + continue; + } + + nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); + + nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); + + skb_reserve(skb, pkt_off); + skb_put(skb, pkt_len); + + skb->mark = meta.mark; + skb_set_hash(skb, meta.hash, meta.hash_type); + + skb_record_rx_queue(skb, rx_ring->idx); + skb->protocol = eth_type_trans(skb, netdev); + + nfp_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb); + + if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), + le16_to_cpu(rxd->rxd.vlan)); + if (meta_len_xdp) + skb_metadata_set(skb, meta_len_xdp); + + if (likely(!redir_egress)) { + napi_gro_receive(&rx_ring->r_vec->napi, skb); + } else { + skb->dev = netdev; + skb_reset_network_header(skb); + __skb_push(skb, ETH_HLEN); + dev_queue_xmit(skb); + } + } + + if (xdp_prog) { + if (tx_ring->wr_ptr_add) + nfp_net_tx_xmit_more_flush(tx_ring); + else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && + !xdp_tx_cmpl) + if (!nfp_nfdk_xdp_complete(tx_ring)) + pkts_polled = budget; + } + + return pkts_polled; +} + +/** + * nfp_nfdk_poll() - napi poll function + * @napi: NAPI structure + * @budget: NAPI budget + * + * Return: number of packets polled. + */ +int nfp_nfdk_poll(struct napi_struct *napi, int budget) +{ + struct nfp_net_r_vector *r_vec = + container_of(napi, struct nfp_net_r_vector, napi); + unsigned int pkts_polled = 0; + + if (r_vec->tx_ring) + nfp_nfdk_tx_complete(r_vec->tx_ring, budget); + if (r_vec->rx_ring) + pkts_polled = nfp_nfdk_rx(r_vec->rx_ring, budget); + + if (pkts_polled < budget) + if (napi_complete_done(napi, pkts_polled)) + nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); + + if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) { + struct dim_sample dim_sample = {}; + unsigned int start; + u64 pkts, bytes; + + do { + start = u64_stats_fetch_begin(&r_vec->rx_sync); + pkts = r_vec->rx_pkts; + bytes = r_vec->rx_bytes; + } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); + + dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); + net_dim(&r_vec->rx_dim, dim_sample); + } + + if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) { + struct dim_sample dim_sample = {}; + unsigned int start; + u64 pkts, bytes; + + do { + start = u64_stats_fetch_begin(&r_vec->tx_sync); + pkts = r_vec->tx_pkts; + bytes = r_vec->tx_bytes; + } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); + + dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); + net_dim(&r_vec->tx_dim, dim_sample); + } + + return pkts_polled; +} + +/* Control device data path + */ + +bool +nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, + struct sk_buff *skb, bool old) +{ + u32 cnt, tmp_dlen, dlen_type = 0; + struct nfp_net_tx_ring *tx_ring; + struct nfp_nfdk_tx_buf *txbuf; + struct nfp_nfdk_tx_desc *txd; + unsigned int dma_len, type; + struct nfp_net_dp *dp; + dma_addr_t dma_addr; + u64 metadata = 0; + int wr_idx; + + dp = &r_vec->nfp_net->dp; + tx_ring = r_vec->tx_ring; + + if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { + nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); + goto err_free; + } + + /* Don't bother counting frags, assume the worst */ + if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) { + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_busy++; + u64_stats_update_end(&r_vec->tx_sync); + if (!old) + __skb_queue_tail(&r_vec->queue, skb); + else + __skb_queue_head(&r_vec->queue, skb); + return NETDEV_TX_BUSY; + } + + if (nfp_app_ctrl_has_meta(nn->app)) { + if (unlikely(skb_headroom(skb) < 8)) { + nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); + goto err_free; + } + metadata = NFDK_DESC_TX_CHAIN_META; + put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); + put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) | + FIELD_PREP(NFDK_META_FIELDS, + NFP_NET_META_PORTID), + skb_push(skb, 4)); + } + + if (nfp_nfdk_tx_maybe_close_block(tx_ring, 0, skb)) + goto err_free; + + /* DMA map all */ + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + txd = &tx_ring->ktxds[wr_idx]; + txbuf = &tx_ring->ktxbufs[wr_idx]; + + dma_len = skb_headlen(skb); + if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD) + type = NFDK_DESC_TX_TYPE_SIMPLE; + else + type = NFDK_DESC_TX_TYPE_GATHER; + + dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_warn_dma; + + txbuf->skb = skb; + txbuf++; + + txbuf->dma_addr = dma_addr; + txbuf++; + + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD, dma_len) | + FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); + + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; + dma_len -= tmp_dlen; + dma_addr += tmp_dlen + 1; + txd++; + + while (dma_len > 0) { + dma_len -= 1; + dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); + txd->dma_len_type = cpu_to_le16(dlen_type); + nfp_desc_set_dma_addr(txd, dma_addr); + + dlen_type &= NFDK_DESC_TX_DMA_LEN; + dma_len -= dlen_type; + dma_addr += dlen_type + 1; + txd++; + } + + (txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP); + + /* Metadata desc */ + txd->raw = cpu_to_le64(metadata); + txd++; + + cnt = txd - tx_ring->ktxds - wr_idx; + if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) != + round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT))) + goto err_warn_overflow; + + tx_ring->wr_p += cnt; + if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT) + tx_ring->data_pending += skb->len; + else + tx_ring->data_pending = 0; + + tx_ring->wr_ptr_add += cnt; + nfp_net_tx_xmit_more_flush(tx_ring); + + return NETDEV_TX_OK; + +err_warn_overflow: + WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d", + wr_idx, skb_headlen(skb), 0, cnt); + txbuf--; + dma_unmap_single(dp->dev, txbuf->dma_addr, + skb_headlen(skb), DMA_TO_DEVICE); + txbuf->raw = 0; +err_warn_dma: + nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); +err_free: + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_errors++; + u64_stats_update_end(&r_vec->tx_sync); + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) +{ + struct sk_buff *skb; + + while ((skb = __skb_dequeue(&r_vec->queue))) + if (nfp_nfdk_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) + return; +} + +static bool +nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) +{ + u32 meta_type, meta_tag; + + if (!nfp_app_ctrl_has_meta(nn->app)) + return !meta_len; + + if (meta_len != 8) + return false; + + meta_type = get_unaligned_be32(data); + meta_tag = get_unaligned_be32(data + 4); + + return (meta_type == NFP_NET_META_PORTID && + meta_tag == NFP_META_PORT_ID_CTRL); +} + +static bool +nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, + struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) +{ + unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; + struct nfp_net_rx_buf *rxbuf; + struct nfp_net_rx_desc *rxd; + dma_addr_t new_dma_addr; + struct sk_buff *skb; + void *new_frag; + int idx; + + idx = D_IDX(rx_ring, rx_ring->rd_p); + + rxd = &rx_ring->rxds[idx]; + if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) + return false; + + /* Memory barrier to ensure that we won't do other reads + * before the DD bit. + */ + dma_rmb(); + + rx_ring->rd_p++; + + rxbuf = &rx_ring->rxbufs[idx]; + meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; + data_len = le16_to_cpu(rxd->rxd.data_len); + pkt_len = data_len - meta_len; + + pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; + if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) + pkt_off += meta_len; + else + pkt_off += dp->rx_offset; + meta_off = pkt_off - meta_len; + + /* Stats update */ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_pkts++; + r_vec->rx_bytes += pkt_len; + u64_stats_update_end(&r_vec->rx_sync); + + nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); + + if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { + nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", + meta_len); + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + return true; + } + + skb = build_skb(rxbuf->frag, dp->fl_bufsz); + if (unlikely(!skb)) { + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + return true; + } + new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr); + if (unlikely(!new_frag)) { + nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); + return true; + } + + nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); + + nfp_nfdk_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); + + skb_reserve(skb, pkt_off); + skb_put(skb, pkt_len); + + nfp_app_ctrl_rx(nn->app, skb); + + return true; +} + +static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) +{ + struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; + struct nfp_net *nn = r_vec->nfp_net; + struct nfp_net_dp *dp = &nn->dp; + unsigned int budget = 512; + + while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) + continue; + + return budget; +} + +void nfp_nfdk_ctrl_poll(struct tasklet_struct *t) +{ + struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); + + spin_lock(&r_vec->lock); + nfp_nfdk_tx_complete(r_vec->tx_ring, 0); + __nfp_ctrl_tx_queued(r_vec); + spin_unlock(&r_vec->lock); + + if (nfp_ctrl_rx(r_vec)) { + nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); + } else { + tasklet_schedule(&r_vec->tasklet); + nn_dp_warn(&r_vec->nfp_net->dp, + "control message budget exceeded!\n"); + } +} |