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net: sh_eth: fix incorrect RX length error if R8A7740

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This patch fixes an issue that the driver increments the "RX length error"
on every buffer in sh_eth_rx() if the R8A7740.
This patch also adds a description about the Receive Frame Status bits.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yoshihiro Shimoda 2013-06-13 10:15:45 +09:00 • committed by David S. Miller
commit dd01989735
1 changed files with 11 additions and 4 deletions
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15
drivers/net/ethernet/renesas/sh_eth.c
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@ -1401,16 +1401,23 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status)
desc_status = edmac_to_cpu(mdp, rxdesc->status);
pkt_len = rxdesc->frame_length;
#if defined(CONFIG_ARCH_R8A7740)
desc_status >>= 16;
#endif
if (--boguscnt < 0)
break;
if (!(desc_status & RDFEND))
ndev->stats.rx_length_errors++;
#if defined(CONFIG_ARCH_R8A7740)
/*
* In case of almost all GETHER/ETHERs, the Receive Frame State
* (RFS) bits in the Receive Descriptor 0 are from bit 9 to
* bit 0. However, in case of the R8A7740's GETHER, the RFS
* bits are from bit 25 to bit 16. So, the driver needs right
* shifting by 16.
*/
desc_status >>= 16;
#endif
if (desc_status & (RD_RFS1 | RD_RFS2 | RD_RFS3 | RD_RFS4 |
RD_RFS5 | RD_RFS6 | RD_RFS10)) {
ndev->stats.rx_errors++;