diff options
| author |   Michael Chan <mchan@broadcom.com> | 2012-03-04 14:48:15 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-03-04 20:39:31 -0500 |
| commit | 2fae5e3670a666039e6f2fd63e1a5d320c71b913 (patch) | |
| tree | ba4d3527b13cc3f6da50f79efeba6f1e6f61981b | |
| parent | tg3: Add memory barriers to sync BD data (diff) | |
| download | linux-dev-2fae5e3670a666039e6f2fd63e1a5d320c71b913.tar.xz linux-dev-2fae5e3670a666039e6f2fd63e1a5d320c71b913.zip | |
tg3: Fix poor tx performance on 57766 after MTU change
GRC reset causes the read DMA engine to go into a mode that breaks up
requests into 256 bytes. A PHY reset is required to bring it back to
the normal mode.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index 0da93dbbd0c8..a8490a473a1c 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -12267,7 +12267,7 @@ static inline void tg3_set_mtu(struct net_device *dev, struct tg3 *tp, static int tg3_change_mtu(struct net_device *dev, int new_mtu) { struct tg3 *tp = netdev_priv(dev); - int err; + int err, reset_phy = 0; if (new_mtu < TG3_MIN_MTU || new_mtu > TG3_MAX_MTU(tp)) return -EINVAL; @@ -12290,7 +12290,13 @@ static int tg3_change_mtu(struct net_device *dev, int new_mtu) tg3_set_mtu(dev, tp, new_mtu); - err = tg3_restart_hw(tp, 0); + /* Reset PHY, otherwise the read DMA engine will be in a mode that + * breaks all requests to 256 bytes. + */ + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57766) + reset_phy = 1; + + err = tg3_restart_hw(tp, reset_phy); if (!err) tg3_netif_start(tp); |