bnxt_en: Add tx_resets ring counter

Add a new tx_resets ring counter.  This counter will be saved as
tx_total_resets across any reset.  Since we currently do a full reset
in bnxt_sched_reset_txr(), the per ring counter will always be cleared
during reset.  Only the tx_total_resets count will be meaningful and we
only display this under ethtool -S.

Link: https://lore.kernel.org/netdev/CACKFLimD-bKmJ1tGZOLYRjWzEwxkri-Mw7iFme1x2Dr0twdCeg@mail.gmail.com/
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20230817231911.165035-7-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Michael Chan

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -9397,6 +9397,8 @@ static void bnxt_disable_napi(struct bnxt *bp)
 		struct bnxt_cp_ring_info *cpr;
 
 		cpr = &bnapi->cp_ring;
+		if (bnapi->tx_fault)
+			cpr->sw_stats.tx.tx_resets++;
 		if (bnapi->in_reset)
 			cpr->sw_stats.rx.rx_resets++;
 		napi_disable(&bnapi->napi);
@@ -10951,6 +10953,7 @@ static void bnxt_get_one_ring_err_stats(struct bnxt *bp,
 	stats->rx_total_netpoll_discards += sw_stats->rx.rx_netpoll_discards;
 	stats->rx_total_ring_discards +=
 		BNXT_GET_RING_STATS64(hw_stats, rx_discard_pkts);
+	stats->tx_total_resets += sw_stats->tx.tx_resets;
 	stats->tx_total_ring_discards +=
 		BNXT_GET_RING_STATS64(hw_stats, tx_discard_pkts);
 	stats->total_missed_irqs += sw_stats->cmn.missed_irqs;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -939,12 +939,17 @@ struct bnxt_rx_sw_stats {
 	u64			rx_netpoll_discards;
 };
 
+struct bnxt_tx_sw_stats {
+	u64			tx_resets;
+};
+
 struct bnxt_cmn_sw_stats {
 	u64			missed_irqs;
 };
 
 struct bnxt_sw_stats {
 	struct bnxt_rx_sw_stats rx;
+	struct bnxt_tx_sw_stats tx;
 	struct bnxt_cmn_sw_stats cmn;
 };
 
@@ -955,6 +960,7 @@ struct bnxt_total_ring_err_stats {
 	u64			rx_total_oom_discards;
 	u64			rx_total_netpoll_discards;
 	u64			rx_total_ring_discards;
+	u64			tx_total_resets;
 	u64			tx_total_ring_discards;
 	u64			total_missed_irqs;
 };

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -346,6 +346,7 @@ static const char *const bnxt_ring_err_stats_arr[] = {
 	"rx_total_oom_discards",
 	"rx_total_netpoll_discards",
 	"rx_total_ring_discards",
+	"tx_total_resets",
 	"tx_total_ring_discards",
 	"total_missed_irqs",
 };