nfp: bpf: add packet marking support

Add missing ABI defines and eBPF instructions to allow
mark to be passed on and extend prepend parsing on the
RX path to pick it up from packet metadata.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 70 insertions, 21 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index f091eb758ca2..415691edcaa5 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1293,38 +1293,72 @@ static void nfp_net_rx_csum(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 	}
 }
 
-/**
- * nfp_net_set_hash() - Set SKB hash data
- * @netdev: adapter's net_device structure
- * @skb:   SKB to set the hash data on
- * @rxd:   RX descriptor
- *
- * The RSS hash and hash-type are pre-pended to the packet data.
- * Extract and decode it and set the skb fields.
- */
 static void nfp_net_set_hash(struct net_device *netdev, struct sk_buff *skb,
-			     struct nfp_net_rx_desc *rxd)
+			     unsigned int type, __be32 *hash)
 {
-	struct nfp_net_rx_hash *rx_hash;
-
-	if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS) ||
-	    !(netdev->features & NETIF_F_RXHASH))
+	if (!(netdev->features & NETIF_F_RXHASH))
 		return;
 
-	rx_hash = (struct nfp_net_rx_hash *)(skb->data - sizeof(*rx_hash));
-
-	switch (be32_to_cpu(rx_hash->hash_type)) {
+	switch (type) {
 	case NFP_NET_RSS_IPV4:
 	case NFP_NET_RSS_IPV6:
 	case NFP_NET_RSS_IPV6_EX:
-		skb_set_hash(skb, be32_to_cpu(rx_hash->hash), PKT_HASH_TYPE_L3);
+		skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L3);
 		break;
 	default:
-		skb_set_hash(skb, be32_to_cpu(rx_hash->hash), PKT_HASH_TYPE_L4);
+		skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L4);
 		break;
 	}
 }
 
+static void
+nfp_net_set_hash_desc(struct net_device *netdev, struct sk_buff *skb,
+		      struct nfp_net_rx_desc *rxd)
+{
+	struct nfp_net_rx_hash *rx_hash;
+
+	if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
+		return;
+
+	rx_hash = (struct nfp_net_rx_hash *)(skb->data - sizeof(*rx_hash));
+
+	nfp_net_set_hash(netdev, skb, get_unaligned_be32(&rx_hash->hash_type),
+			 &rx_hash->hash);
+}
+
+static void *
+nfp_net_parse_meta(struct net_device *netdev, struct sk_buff *skb,
+		   int meta_len)
+{
+	u8 *data = skb->data - 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_net_set_hash(netdev, skb,
+					 meta_info & NFP_NET_META_FIELD_MASK,
+					 (__be32 *)data);
+			data += 4;
+			break;
+		case NFP_NET_META_MARK:
+			skb->mark = get_unaligned_be32(data);
+			data += 4;
+			break;
+		default:
+			return NULL;
+		}
+
+		meta_info >>= NFP_NET_META_FIELD_SIZE;
+	}
+
+	return data;
+}
+
 /**
  * nfp_net_rx() - receive up to @budget packets on @rx_ring
  * @rx_ring:   RX ring to receive from
@@ -1439,14 +1473,29 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 			skb_reserve(skb, nn->rx_offset);
 		skb_put(skb, data_len - meta_len);
 
-		nfp_net_set_hash(nn->netdev, skb, rxd);
-
 		/* Stats update */
 		u64_stats_update_begin(&r_vec->rx_sync);
 		r_vec->rx_pkts++;
 		r_vec->rx_bytes += skb->len;
 		u64_stats_update_end(&r_vec->rx_sync);
 
+		if (nn->fw_ver.major <= 3) {
+			nfp_net_set_hash_desc(nn->netdev, skb, rxd);
+		} else if (meta_len) {
+			void *end;
+
+			end = nfp_net_parse_meta(nn->netdev, skb, meta_len);
+			if (unlikely(end != skb->data)) {
+				u64_stats_update_begin(&r_vec->rx_sync);
+				r_vec->rx_drops++;
+				u64_stats_update_end(&r_vec->rx_sync);
+
+				dev_kfree_skb_any(skb);
+				nn_warn_ratelimit(nn, "invalid RX packet metadata\n");
+				continue;
+			}
+		}
+
 		skb_record_rx_queue(skb, rx_ring->idx);
 		skb->protocol = eth_type_trans(skb, nn->netdev);