net: mana: Add counter for packet dropped by XDP

This counter will show up in ethtool stat data.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microsoft/mana/mana.h

@@ -48,7 +48,14 @@ enum TRI_STATE {
 
 #define MAX_PORTS_IN_MANA_DEV 256
 
-struct mana_stats {
+struct mana_stats_rx {
+	u64 packets;
+	u64 bytes;
+	u64 xdp_drop;
+	struct u64_stats_sync syncp;
+};
+
+struct mana_stats_tx {
 	u64 packets;
 	u64 bytes;
 	struct u64_stats_sync syncp;
@@ -76,7 +83,7 @@ struct mana_txq {
 
 	atomic_t pending_sends;
 
-	struct mana_stats stats;
+	struct mana_stats_tx stats;
 };
 
 /* skb data and frags dma mappings */
@@ -298,7 +305,7 @@ struct mana_rxq {
 
 	u32 buf_index;
 
-	struct mana_stats stats;
+	struct mana_stats_rx stats;
 
 	struct bpf_prog __rcu *bpf_prog;
 	struct xdp_rxq_info xdp_rxq;

drivers/net/ethernet/microsoft/mana/mana_en.c

@@ -136,7 +136,7 @@ int mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	bool ipv4 = false, ipv6 = false;
 	struct mana_tx_package pkg = {};
 	struct netdev_queue *net_txq;
-	struct mana_stats *tx_stats;
+	struct mana_stats_tx *tx_stats;
 	struct gdma_queue *gdma_sq;
 	unsigned int csum_type;
 	struct mana_txq *txq;
@@ -299,7 +299,8 @@ static void mana_get_stats64(struct net_device *ndev,
 {
 	struct mana_port_context *apc = netdev_priv(ndev);
 	unsigned int num_queues = apc->num_queues;
-	struct mana_stats *stats;
+	struct mana_stats_rx *rx_stats;
+	struct mana_stats_tx *tx_stats;
 	unsigned int start;
 	u64 packets, bytes;
 	int q;
@@ -310,26 +311,26 @@ static void mana_get_stats64(struct net_device *ndev,
 	netdev_stats_to_stats64(st, &ndev->stats);
 
 	for (q = 0; q < num_queues; q++) {
-		stats = &apc->rxqs[q]->stats;
+		rx_stats = &apc->rxqs[q]->stats;
 
 		do {
-			start = u64_stats_fetch_begin_irq(&stats->syncp);
-			packets = stats->packets;
-			bytes = stats->bytes;
-		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+			start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
+			packets = rx_stats->packets;
+			bytes = rx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
 
 		st->rx_packets += packets;
 		st->rx_bytes += bytes;
 	}
 
 	for (q = 0; q < num_queues; q++) {
-		stats = &apc->tx_qp[q].txq.stats;
+		tx_stats = &apc->tx_qp[q].txq.stats;
 
 		do {
-			start = u64_stats_fetch_begin_irq(&stats->syncp);
-			packets = stats->packets;
-			bytes = stats->bytes;
-		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+			start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
+			packets = tx_stats->packets;
+			bytes = tx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
 
 		st->tx_packets += packets;
 		st->tx_bytes += bytes;
@@ -986,7 +987,7 @@ static struct sk_buff *mana_build_skb(void *buf_va, uint pkt_len,
 static void mana_rx_skb(void *buf_va, struct mana_rxcomp_oob *cqe,
 			struct mana_rxq *rxq)
 {
-	struct mana_stats *rx_stats = &rxq->stats;
+	struct mana_stats_rx *rx_stats = &rxq->stats;
 	struct net_device *ndev = rxq->ndev;
 	uint pkt_len = cqe->ppi[0].pkt_len;
 	u16 rxq_idx = rxq->rxq_idx;
@@ -1007,7 +1008,7 @@ static void mana_rx_skb(void *buf_va, struct mana_rxcomp_oob *cqe,
 	act = mana_run_xdp(ndev, rxq, &xdp, buf_va, pkt_len);
 
 	if (act != XDP_PASS && act != XDP_TX)
-		goto drop;
+		goto drop_xdp;
 
 	skb = mana_build_skb(buf_va, pkt_len, &xdp);
 
@@ -1048,9 +1049,15 @@ static void mana_rx_skb(void *buf_va, struct mana_rxcomp_oob *cqe,
 	u64_stats_update_end(&rx_stats->syncp);
 	return;
 
+drop_xdp:
+	u64_stats_update_begin(&rx_stats->syncp);
+	rx_stats->xdp_drop++;
+	u64_stats_update_end(&rx_stats->syncp);
+
 drop:
 	free_page((unsigned long)buf_va);
 	++ndev->stats.rx_dropped;
+
 	return;
 }
 

drivers/net/ethernet/microsoft/mana/mana_ethtool.c

@@ -23,7 +23,7 @@ static int mana_get_sset_count(struct net_device *ndev, int stringset)
 	if (stringset != ETH_SS_STATS)
 		return -EINVAL;
 
-	return ARRAY_SIZE(mana_eth_stats) + num_queues * 4;
+	return ARRAY_SIZE(mana_eth_stats) + num_queues * 5;
 }
 
 static void mana_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
@@ -46,6 +46,8 @@ static void mana_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
 		p += ETH_GSTRING_LEN;
 		sprintf(p, "rx_%d_bytes", i);
 		p += ETH_GSTRING_LEN;
+		sprintf(p, "rx_%d_xdp_drop", i);
+		p += ETH_GSTRING_LEN;
 	}
 
 	for (i = 0; i < num_queues; i++) {
@@ -62,9 +64,11 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 	struct mana_port_context *apc = netdev_priv(ndev);
 	unsigned int num_queues = apc->num_queues;
 	void *eth_stats = &apc->eth_stats;
-	struct mana_stats *stats;
+	struct mana_stats_rx *rx_stats;
+	struct mana_stats_tx *tx_stats;
 	unsigned int start;
 	u64 packets, bytes;
+	u64 xdp_drop;
 	int q, i = 0;
 
 	if (!apc->port_is_up)
@@ -74,26 +78,28 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 		data[i++] = *(u64 *)(eth_stats + mana_eth_stats[q].offset);
 
 	for (q = 0; q < num_queues; q++) {
-		stats = &apc->rxqs[q]->stats;
+		rx_stats = &apc->rxqs[q]->stats;
 
 		do {
-			start = u64_stats_fetch_begin_irq(&stats->syncp);
-			packets = stats->packets;
-			bytes = stats->bytes;
-		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+			start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
+			packets = rx_stats->packets;
+			bytes = rx_stats->bytes;
+			xdp_drop = rx_stats->xdp_drop;
+		} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
 
 		data[i++] = packets;
 		data[i++] = bytes;
+		data[i++] = xdp_drop;
 	}
 
 	for (q = 0; q < num_queues; q++) {
-		stats = &apc->tx_qp[q].txq.stats;
+		tx_stats = &apc->tx_qp[q].txq.stats;
 
 		do {
-			start = u64_stats_fetch_begin_irq(&stats->syncp);
-			packets = stats->packets;
-			bytes = stats->bytes;
-		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+			start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
+			packets = tx_stats->packets;
+			bytes = tx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
 
 		data[i++] = packets;
 		data[i++] = bytes;