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jme: Fix FIFO flush issue

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commit ba9adbe67e upstream.

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.

Reported-by: Federico Quagliata <federico@quagliata.org>
Fixed-by: Federico Quagliata <federico@quagliata.org>
Signed-off-by: Guo-Fu Tseng <cooldavid@cooldavid.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guo-Fu Tseng
2012-02-22 08:58:10 +00:00
committed by Greg Kroah-Hartman
parent 426f45680c
commit 405b695987
2 changed files with 2 additions and 10 deletions
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10
drivers/net/jme.c
View File

@@ -2228,19 +2228,11 @@ 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/jme.h
View File

@@ -734,7 +734,7 @@ 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,