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sh_eth: Optimization for RX excess judgement

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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 <mitsuhiro.kimura.kc@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mitsuhiro Kimura 2014-12-09 21:23:42 +09:00 committed by David S. Miller
parent e008f3f07f
commit 319cd52013
1 changed files with 5 additions and 5 deletions
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10
drivers/net/ethernet/renesas/sh_eth.c
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@ -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;
}