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jme: Fix FIFO flush issue

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Set the RX FIFO flush watermark lower.
According to Federico and JMicron's reply,
setting it to 16QW would be stable on most platforms.
Otherwise, user might experience packet drop issue.

CC: [email protected]
Reported-by: Federico Quagliata <[email protected]>
Fixed-by: Federico Quagliata <[email protected]>
Signed-off-by: Guo-Fu Tseng <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Guo-Fu Tseng 2012-02-22 08:58:10 +00:00 • committed by David S. Miller
commit ba9adbe67e
2 changed files with 2 additions and 10 deletions
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10
drivers/net/ethernet/jme.c
View file

@ -2328,19 +2328,11 @@ jme_change_mtu(struct net_device *netdev, int new_mtu)
((new_mtu) < IPV6_MIN_MTU))
return -EINVAL;
if (new_mtu > 4000) {
jme->reg_rxcs &= ~RXCS_FIFOTHNP;
jme->reg_rxcs |= RXCS_FIFOTHNP_64QW;
jme_restart_rx_engine(jme);
} else {
jme->reg_rxcs &= ~RXCS_FIFOTHNP;
jme->reg_rxcs |= RXCS_FIFOTHNP_128QW;
jme_restart_rx_engine(jme);
}
netdev->mtu = new_mtu;
netdev_update_features(netdev);
jme_restart_rx_engine(jme);
jme_reset_link(jme);
return 0;

2
drivers/net/ethernet/jme.h
View file

@ -730,7 +730,7 @@ enum jme_rxcs_values {
RXCS_RETRYCNT_60 = 0x00000F00,
RXCS_DEFAULT = RXCS_FIFOTHTP_128T |
RXCS_FIFOTHNP_128QW |
RXCS_FIFOTHNP_16QW |
RXCS_DMAREQSZ_128B |
RXCS_RETRYGAP_256ns |
RXCS_RETRYCNT_32,