From: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Date: Thu, 26 Apr 2018 17:44:36 -0400
Subject: bnxt_en: Display function level rx/tx_discard_pkts via ethtool
Patch-mainline: v4.18-rc1
Git-commit: 20c1d28e106c0b526ae015fcac8e1e254bff091c
References: bsc#1086282 FATE#324873

Add counters to display sum of rx/tx_discard_pkts of all rings as
function level statistics via ethtool.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |   33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -128,6 +128,19 @@ static int bnxt_set_coalesce(struct net_
 #define BNXT_RX_STATS_EXT_ENTRY(counter)	\
 	{ BNXT_RX_STATS_EXT_OFFSET(counter), __stringify(counter) }
 
+enum {
+	RX_TOTAL_DISCARDS,
+	TX_TOTAL_DISCARDS,
+};
+
+static struct {
+	u64			counter;
+	char			string[ETH_GSTRING_LEN];
+} bnxt_sw_func_stats[] = {
+	{0, "rx_total_discard_pkts"},
+	{0, "tx_total_discard_pkts"},
+};
+
 static const struct {
 	long offset;
 	char string[ETH_GSTRING_LEN];
@@ -225,6 +238,7 @@ static const struct {
 	BNXT_RX_STATS_EXT_ENTRY(resume_roce_pause_events),
 };
 
+#define BNXT_NUM_SW_FUNC_STATS	ARRAY_SIZE(bnxt_sw_func_stats)
 #define BNXT_NUM_PORT_STATS ARRAY_SIZE(bnxt_port_stats_arr)
 #define BNXT_NUM_PORT_STATS_EXT ARRAY_SIZE(bnxt_port_stats_ext_arr)
 
@@ -232,6 +246,8 @@ static int bnxt_get_num_stats(struct bnx
 {
 	int num_stats = BNXT_NUM_STATS * bp->cp_nr_rings;
 
+	num_stats += BNXT_NUM_SW_FUNC_STATS;
+
 	if (bp->flags & BNXT_FLAG_PORT_STATS)
 		num_stats += BNXT_NUM_PORT_STATS;
 
@@ -267,6 +283,9 @@ static void bnxt_get_ethtool_stats(struc
 	if (!bp->bnapi)
 		return;
 
+	for (i = 0; i < BNXT_NUM_SW_FUNC_STATS; i++)
+		bnxt_sw_func_stats[i].counter = 0;
+
 	for (i = 0; i < bp->cp_nr_rings; i++) {
 		struct bnxt_napi *bnapi = bp->bnapi[i];
 		struct bnxt_cp_ring_info *cpr = &bnapi->cp_ring;
@@ -276,7 +295,16 @@ static void bnxt_get_ethtool_stats(struc
 		for (k = 0; k < stat_fields; j++, k++)
 			buf[j] = le64_to_cpu(hw_stats[k]);
 		buf[j++] = cpr->rx_l4_csum_errors;
+
+		bnxt_sw_func_stats[RX_TOTAL_DISCARDS].counter +=
+			le64_to_cpu(cpr->hw_stats->rx_discard_pkts);
+		bnxt_sw_func_stats[TX_TOTAL_DISCARDS].counter +=
+			le64_to_cpu(cpr->hw_stats->tx_discard_pkts);
 	}
+
+	for (i = 0; i < BNXT_NUM_SW_FUNC_STATS; i++, j++)
+		buf[j] = bnxt_sw_func_stats[i].counter;
+
 	if (bp->flags & BNXT_FLAG_PORT_STATS) {
 		__le64 *port_stats = (__le64 *)bp->hw_rx_port_stats;
 
@@ -347,6 +375,11 @@ static void bnxt_get_strings(struct net_
 			sprintf(buf, "[%d]: rx_l4_csum_errors", i);
 			buf += ETH_GSTRING_LEN;
 		}
+		for (i = 0; i < BNXT_NUM_SW_FUNC_STATS; i++) {
+			strcpy(buf, bnxt_sw_func_stats[i].string);
+			buf += ETH_GSTRING_LEN;
+		}
+
 		if (bp->flags & BNXT_FLAG_PORT_STATS) {
 			for (i = 0; i < BNXT_NUM_PORT_STATS; i++) {
 				strcpy(buf, bnxt_port_stats_arr[i].string);