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authorwilly tarreau <w@1wt.eu>2014-01-16 08:20:07 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-08-07 14:30:27 -0700
commit5831364f63388662b37b92b2ff6c21a63e82d60d (patch)
tree5b4491933a83e1305ab886bf70c6fa3afb84f0e8
parentf62ec7353efa042524f769d0ada4cd18a9348433 (diff)
net: mvneta: increase the 64-bit rx/tx stats out of the hot path
commit dc4277dd41a80fd5f29a90412ea04bc3ba54fbf1 upstream. Better count packets and bytes in the stack and on 32 bit then accumulate them at the end for once. This saves two memory writes and two memory barriers per packet. The incoming packet rate was increased by 4.7% on the Openblocks AX3 thanks to this. Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Tested-by: Arnaud Ebalard <arno@natisbad.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/ethernet/marvell/mvneta.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 658613021919..0c0b5763549a 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1354,6 +1354,8 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
{
struct net_device *dev = pp->dev;
int rx_done, rx_filled;
+ u32 rcvd_pkts = 0;
+ u32 rcvd_bytes = 0;
/* Get number of received packets */
rx_done = mvneta_rxq_busy_desc_num_get(pp, rxq);
@@ -1391,10 +1393,8 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
rx_bytes = rx_desc->data_size -
(ETH_FCS_LEN + MVNETA_MH_SIZE);
- u64_stats_update_begin(&pp->rx_stats.syncp);
- pp->rx_stats.packets++;
- pp->rx_stats.bytes += rx_bytes;
- u64_stats_update_end(&pp->rx_stats.syncp);
+ rcvd_pkts++;
+ rcvd_bytes += rx_bytes;
/* Linux processing */
skb_reserve(skb, MVNETA_MH_SIZE);
@@ -1415,6 +1415,13 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
}
}
+ if (rcvd_pkts) {
+ u64_stats_update_begin(&pp->rx_stats.syncp);
+ pp->rx_stats.packets += rcvd_pkts;
+ pp->rx_stats.bytes += rcvd_bytes;
+ u64_stats_update_end(&pp->rx_stats.syncp);
+ }
+
/* Update rxq management counters */
mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_filled);