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be2net: add a counter for pkts dropped in xmit path

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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>
This commit is contained in:
Sathya Perla 2013-10-01 16:00:01 +05:30 committed by David S. Miller
parent 2632bafd74
commit bc617526db
3 changed files with 8 additions and 2 deletions
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1
drivers/net/ethernet/emulex/benet/be.h
View File

@ -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;
};

4
drivers/net/ethernet/emulex/benet/be_ethtool.c
View File

@ -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))

5
drivers/net/ethernet/emulex/benet/be_main.c
View File

@ -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;