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>

3 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 3f0be02e85e2..896ea8a72386 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 dbac71ba71b1..da459f7177c6 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 96e44a825443..705e654c368a 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) {