jme: Fix FIFO flush issue
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: stable@kernel.org 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>
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@ -2328,19 +2328,11 @@ jme_change_mtu(struct net_device *netdev, int new_mtu)
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((new_mtu) < IPV6_MIN_MTU))
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return -EINVAL;
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if (new_mtu > 4000) {
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jme->reg_rxcs &= ~RXCS_FIFOTHNP;
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jme->reg_rxcs |= RXCS_FIFOTHNP_64QW;
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jme_restart_rx_engine(jme);
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} else {
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jme->reg_rxcs &= ~RXCS_FIFOTHNP;
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jme->reg_rxcs |= RXCS_FIFOTHNP_128QW;
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jme_restart_rx_engine(jme);
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}
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netdev->mtu = new_mtu;
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netdev_update_features(netdev);
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jme_restart_rx_engine(jme);
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jme_reset_link(jme);
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return 0;
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@ -730,7 +730,7 @@ enum jme_rxcs_values {
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RXCS_RETRYCNT_60 = 0x00000F00,
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RXCS_DEFAULT = RXCS_FIFOTHTP_128T |
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RXCS_FIFOTHNP_128QW |
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RXCS_FIFOTHNP_16QW |
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RXCS_DMAREQSZ_128B |
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RXCS_RETRYGAP_256ns |
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RXCS_RETRYCNT_32,
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