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net: mvneta: increase the 64-bit rx/tx stats out of the hot path

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[ Upstream commit dc4277dd41 ]

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>
This commit is contained in:
willy tarreau
2014-01-16 08:20:07 +01:00
committed by Greg Kroah-Hartman
parent f7152716d6
commit fbfbed33a5
1 changed files with 11 additions and 4 deletions
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15
drivers/net/ethernet/marvell/mvneta.c
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@@ -1391,6 +1391,8 @@ 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);
@@ -1428,10 +1430,8 @@ 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);
@@ -1452,6 +1452,13 @@ 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);