[PATCH net-next v5 3/3] net: mana: Add ethtool counters for RX CQEs in coalesced type

[Haiyang Zhang <haiyangz@linux.microsoft.com>]

From: Haiyang Zhang <haiyangz@microsoft.com>

For RX CQEs with type CQE_RX_COALESCED_4, to measure the coalescing
efficiency, add counters to count how many contains 2, 3, 4 packets
respectively.
Also, add a counter for the error case of first packet with length == 0.

Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
v5:
  Combine the accounting logics as suggested by Simon Horman.

---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 24 +++++++++++++------
 .../ethernet/microsoft/mana/mana_ethtool.c    | 15 ++++++++++--
 include/net/mana/mana.h                       |  9 ++++---
 3 files changed, 36 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index fa30046dcd3d..49c65cc1697c 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -2147,14 +2147,8 @@ static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
 	for (i = 0; i < MANA_RXCOMP_OOB_NUM_PPI; i++) {
 		old_buf = NULL;
 		pktlen = oob->ppi[i].pkt_len;
-		if (pktlen == 0) {
-			if (i == 0)
-				netdev_err_once(
-					ndev,
-					"RX pkt len=0, rq=%u, cq=%u, rxobj=0x%llx\n",
-					rxq->gdma_id, cq->gdma_id, rxq->rxobj);
+		if (pktlen == 0)
 			break;
-		}
 
 		curr = rxq->buf_index;
 		rxbuf_oob = &rxq->rx_oobs[curr];
@@ -2175,6 +2169,22 @@ static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
 		if (!coalesced)
 			break;
 	}
+
+	/* Collect coalesced CQE count based on packets processed.
+	 * Coalesced CQEs have at least 2 packets, so index is i - 2.
+	 */
+	if (i > 1) {
+		u64_stats_update_begin(&rxq->stats.syncp);
+		rxq->stats.coalesced_cqe[i - 2]++;
+		u64_stats_update_end(&rxq->stats.syncp);
+	} else if (!i && !pktlen) {
+		u64_stats_update_begin(&rxq->stats.syncp);
+		rxq->stats.pkt_len0_err++;
+		u64_stats_update_end(&rxq->stats.syncp);
+		netdev_err_once(ndev,
+				"RX pkt len=0, rq=%u, cq=%u, rxobj=0x%llx\n",
+				rxq->gdma_id, cq->gdma_id, rxq->rxobj);
+	}
 }
 
 static void mana_poll_rx_cq(struct mana_cq *cq)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
index 4b234b16e57a..6a4b42fe0944 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
@@ -149,7 +149,7 @@ static void mana_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
 {
 	struct mana_port_context *apc = netdev_priv(ndev);
 	unsigned int num_queues = apc->num_queues;
-	int i;
+	int i, j;
 
 	if (stringset != ETH_SS_STATS)
 		return;
@@ -168,6 +168,9 @@ static void mana_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
 		ethtool_sprintf(&data, "rx_%d_xdp_drop", i);
 		ethtool_sprintf(&data, "rx_%d_xdp_tx", i);
 		ethtool_sprintf(&data, "rx_%d_xdp_redirect", i);
+		ethtool_sprintf(&data, "rx_%d_pkt_len0_err", i);
+		for (j = 0; j < MANA_RXCOMP_OOB_NUM_PPI - 1; j++)
+			ethtool_sprintf(&data, "rx_%d_coalesced_cqe_%d", i, j + 2);
 	}
 
 	for (i = 0; i < num_queues; i++) {
@@ -201,6 +204,8 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 	u64 xdp_xmit;
 	u64 xdp_drop;
 	u64 xdp_tx;
+	u64 pkt_len0_err;
+	u64 coalesced_cqe[MANA_RXCOMP_OOB_NUM_PPI - 1];
 	u64 tso_packets;
 	u64 tso_bytes;
 	u64 tso_inner_packets;
@@ -209,7 +214,7 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 	u64 short_pkt_fmt;
 	u64 csum_partial;
 	u64 mana_map_err;
-	int q, i = 0;
+	int q, i = 0, j;
 
 	if (!apc->port_is_up)
 		return;
@@ -239,6 +244,9 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 			xdp_drop = rx_stats->xdp_drop;
 			xdp_tx = rx_stats->xdp_tx;
 			xdp_redirect = rx_stats->xdp_redirect;
+			pkt_len0_err = rx_stats->pkt_len0_err;
+			for (j = 0; j < MANA_RXCOMP_OOB_NUM_PPI - 1; j++)
+				coalesced_cqe[j] = rx_stats->coalesced_cqe[j];
 		} while (u64_stats_fetch_retry(&rx_stats->syncp, start));
 
 		data[i++] = packets;
@@ -246,6 +254,9 @@ static void mana_get_ethtool_stats(struct net_device *ndev,
 		data[i++] = xdp_drop;
 		data[i++] = xdp_tx;
 		data[i++] = xdp_redirect;
+		data[i++] = pkt_len0_err;
+		for (j = 0; j < MANA_RXCOMP_OOB_NUM_PPI - 1; j++)
+			data[i++] = coalesced_cqe[j];
 	}
 
 	for (q = 0; q < num_queues; q++) {
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index a7f89e7ddc56..3336688fed5e 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -61,8 +61,11 @@ enum TRI_STATE {
 
 #define MAX_PORTS_IN_MANA_DEV 256
 
+/* Maximum number of packets per coalesced CQE */
+#define MANA_RXCOMP_OOB_NUM_PPI 4
+
 /* Update this count whenever the respective structures are changed */
-#define MANA_STATS_RX_COUNT 5
+#define MANA_STATS_RX_COUNT (6 + MANA_RXCOMP_OOB_NUM_PPI - 1)
 #define MANA_STATS_TX_COUNT 11
 
 #define MANA_RX_FRAG_ALIGNMENT 64
@@ -73,6 +76,8 @@ struct mana_stats_rx {
 	u64 xdp_drop;
 	u64 xdp_tx;
 	u64 xdp_redirect;
+	u64 pkt_len0_err;
+	u64 coalesced_cqe[MANA_RXCOMP_OOB_NUM_PPI - 1];
 	struct u64_stats_sync syncp;
 };
 
@@ -227,8 +232,6 @@ struct mana_rxcomp_perpkt_info {
 	u32 pkt_hash;
 }; /* HW DATA */
 
-#define MANA_RXCOMP_OOB_NUM_PPI 4
-
 /* Receive completion OOB */
 struct mana_rxcomp_oob {
 	struct mana_cqe_header cqe_hdr;
-- 
2.34.1