[PATCH net-next v3 7/9] forcedeth: new ethtool stat counter for TX timeouts

[David Decotigny <david.decotigny@google.com>]

This change publishes a new ethtool stats: tx_timeout that counts the
number of times the tx_timeout callback was triggered.



Signed-off-by: David Decotigny <david.decotigny@google.com>
---
 drivers/net/ethernet/nvidia/forcedeth.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 84e8d17..dd24035 100644
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -633,6 +633,7 @@ static const struct nv_ethtool_str nv_estats_str[] = {
 	{ "rx_packets" },
 	{ "rx_errors_total" },
 	{ "tx_errors_total" },
+	{ "tx_timeout" },
 
 	/* version 2 stats */
 	{ "tx_deferral" },
@@ -673,6 +674,7 @@ struct nv_ethtool_stats {
 	u64 rx_packets; /* should be ifconfig->rx_packets */
 	u64 rx_errors_total;
 	u64 tx_errors_total;
+	u64 tx_timeout;
 
 	/* version 2 stats */
 	u64 tx_deferral;
@@ -852,6 +854,7 @@ struct fe_priv {
 	struct nv_driver_stat stat_tx_packets; /* not always available in HW */
 	struct nv_driver_stat stat_tx_bytes;
 	struct nv_driver_stat stat_tx_dropped;
+	atomic_t stat_tx_timeout;  /* TX timeouts since last nv_update_stats */
 
 	/* msi/msi-x fields */
 	u32 msi_flags;
@@ -1746,6 +1749,7 @@ static void nv_update_stats(struct net_device *dev)
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_packets);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_bytes);
 	NV_DRIVER_STAT_UPDATE_TOTAL(&np->stat_tx_dropped);
+	np->estats.tx_timeout += atomic_xchg(&np->stat_tx_timeout, 0);
 }
 
 /*
@@ -2639,6 +2643,8 @@ static void nv_tx_timeout(struct net_device *dev)
 		}
 	}
 
+	atomic_inc(&np->stat_tx_timeout);
+
 	spin_lock_irq(&np->lock);
 
 	/* 1) stop tx engine */
-- 
1.7.3.1