From: Jesse Brandeburg <jesse.brandeburg@intel.com>
Date: Wed, 1 Nov 2006 16:47:59 +0000 (-0800)
Subject: e1000: add queue restart counter
X-Git-Tag: v2.6.20-rc1~34^2~40^2~463^2~79
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcfb1224250d7877b6a6c6a947986e08b2160fb6;p=linux-2.6

e1000: add queue restart counter

Add a netif_wake/start_queue counter to the ethtool statistics to indicated
to the user that their transmit ring could be too small for their workload.

Signed-off-by: Jesse brandeburg <jesse.brandeburg@intel.com>
Cc: Jamal Hadi <hadi@cyberus.ca>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
---

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 3f0be02e85..896ea8a723 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -265,6 +265,7 @@ struct e1000_adapter {
 
 	/* TX */
 	struct e1000_tx_ring *tx_ring;      /* One per active queue */
+	unsigned int restart_queue;
 	unsigned long tx_queue_len;
 	uint32_t txd_cmd;
 	uint32_t tx_int_delay;
diff --git a/drivers/net/e1000/e1000_ethtool.c b/drivers/net/e1000/e1000_ethtool.c
index dbac71ba71..da459f7177 100644
--- a/drivers/net/e1000/e1000_ethtool.c
+++ b/drivers/net/e1000/e1000_ethtool.c
@@ -85,6 +85,7 @@ static const struct e1000_stats e1000_gstrings_stats[] = {
 	{ "tx_single_coll_ok", E1000_STAT(stats.scc) },
 	{ "tx_multi_coll_ok", E1000_STAT(stats.mcc) },
 	{ "tx_timeout_count", E1000_STAT(tx_timeout_count) },
+	{ "tx_restart_queue", E1000_STAT(restart_queue) },
 	{ "rx_long_length_errors", E1000_STAT(stats.roc) },
 	{ "rx_short_length_errors", E1000_STAT(stats.ruc) },
 	{ "rx_align_errors", E1000_STAT(stats.algnerrc) },
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 96e44a8254..705e654c36 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2974,6 +2974,7 @@ static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
 
 	/* A reprieve! */
 	netif_start_queue(netdev);
+	++adapter->restart_queue;
 	return 0;
 }
 
@@ -3654,8 +3655,10 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
 		 * sees the new next_to_clean.
 		 */
 		smp_mb();
-		if (netif_queue_stopped(netdev))
+		if (netif_queue_stopped(netdev)) {
 			netif_wake_queue(netdev);
+			++adapter->restart_queue;
+		}
 	}
 
 	if (adapter->detect_tx_hung) {