From: willy tarreau Date: Thu, 16 Jan 2014 07:20:07 +0000 (+0100) Subject: net: mvneta: increase the 64-bit rx/tx stats out of the hot path X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=dc4277dd41a80fd5f29a90412ea04bc3ba54fbf1;p=openwrt%2Fstaging%2Fblogic.git net: mvneta: increase the 64-bit rx/tx stats out of the hot path 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 Cc: Gregory CLEMENT Reviewed-by: Eric Dumazet Tested-by: Arnaud Ebalard Signed-off-by: Willy Tarreau Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index d5f0d72e5e33..baa85af96041 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -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);