--- /dev/null
+// 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);
+}
+
+static bool nfp_nfdk_xdp_complete(struct nfp_net_tx_ring *tx_ring)
+{
+ return true;
+}
+
+/* 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);
+}
+
+/**
+ * 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;
+ 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;
+ 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");
+ }
+}
projects / linux-2.6-microblaze.git / commitdiff