From 319cd52013dec3413a3b753f7b7747504aa077df Mon Sep 17 00:00:00 2001 From: Mitsuhiro Kimura Date: Tue, 9 Dec 2014 21:23:42 +0900 Subject: [PATCH] sh_eth: Optimization for RX excess judgement Both of 'boguscnt' and 'quota' have nearly meaning as the condition of the reception loop. In order to cut down redundant processing, this patch changes excess judgement. Signed-off-by: Mitsuhiro Kimura Signed-off-by: Yoshihiro Kaneko Signed-off-by: David S. Miller --- drivers/net/ethernet/renesas/sh_eth.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c index 71f59ee51304..e77025915b23 100644 --- a/drivers/net/ethernet/renesas/sh_eth.c +++ b/drivers/net/ethernet/renesas/sh_eth.c @@ -1395,10 +1395,13 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota) int entry = mdp->cur_rx % mdp->num_rx_ring; int boguscnt = (mdp->dirty_rx + mdp->num_rx_ring) - mdp->cur_rx; + int limit; struct sk_buff *skb; u16 pkt_len = 0; u32 desc_status; + boguscnt = min(boguscnt, *quota); + limit = boguscnt; rxdesc = &mdp->rx_ring[entry]; while (!(rxdesc->status & cpu_to_edmac(mdp, RD_RACT))) { desc_status = edmac_to_cpu(mdp, rxdesc->status); @@ -1407,11 +1410,6 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota) if (--boguscnt < 0) break; - if (*quota <= 0) - break; - - (*quota)--; - if (!(desc_status & RDFEND)) ndev->stats.rx_length_errors++; @@ -1502,6 +1500,8 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota) sh_eth_write(ndev, EDRRR_R, EDRRR); } + *quota -= limit - boguscnt - 1; + return *quota <= 0; } -- 2.39.5