be2net: add a counter for pkts dropped in xmit path

In the xmit path, the driver may drop some pkts due to reasons such as
DMA mapping errors, out of memory conditions or to protect HW from
unrecoverable errors. Add a counter in TX-stats for such drops.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index e7cbc56a0c8f..21b064feaa4e 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -225,6 +225,7 @@ struct be_tx_stats {
         u64 tx_compl;
         ulong tx_jiffies;
         u32 tx_stops;
+        u32 tx_drv_drops;       /* pkts dropped by driver */
         struct u64_stats_sync sync;
         struct u64_stats_sync sync_compl;
 };
diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c b/drivers/net/ethernet/emulex/benet/be_ethtool.c
index a08783c7456e..3dcf817e756d 100644
--- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
+++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
@@ -155,7 +155,9 @@ static const struct be_ethtool_stat et_tx_stats[] = {
         /* Number of times the TX queue was stopped due to lack
          * of spaces in the TXQ.
          */
-        {DRVSTAT_TX_INFO(tx_stops)}
+        {DRVSTAT_TX_INFO(tx_stops)},
+        /* Pkts dropped in the driver's transmit path */
+        {DRVSTAT_TX_INFO(tx_drv_drops)}
 };
 #define ETHTOOL_TXSTATS_NUM (ARRAY_SIZE(et_tx_stats))
 
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 6691d75b6cca..0a168e3d47ab 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -935,8 +935,10 @@ static netdev_tx_t be_xmit(struct sk_buff *skb, struct net_device *netdev)
         u32 start = txq->head;
 
         skb = be_xmit_workarounds(adapter, skb, &skip_hw_vlan);
-        if (!skb)
+        if (!skb) {
+                tx_stats(txo)->tx_drv_drops++;
                 return NETDEV_TX_OK;
+        }
 
         wrb_cnt = wrb_cnt_for_skb(adapter, skb, &dummy_wrb);
 
@@ -965,6 +967,7 @@ static netdev_tx_t be_xmit(struct sk_buff *skb, struct net_device *netdev)
                 be_tx_stats_update(txo, wrb_cnt, copied, gso_segs, stopped);
         } else {
                 txq->head = start;
+                tx_stats(txo)->tx_drv_drops++;
                 dev_kfree_skb_any(skb);
         }
         return NETDEV_TX_OK;