The device does not support the whole mtu range it claims. Experimenting
with the Tx threshold and/or the PCI burst size does not seem to improve
the behavior.
Signed-off-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
diff -puN drivers/net/r8169.c~r8169-265 drivers/net/r8169.c
--- linux-2.6.10-rc2-mm1.orig/drivers/net/r8169.c~r8169-265 2004-11-16
22:26:06.000000000 +0100
+++ linux-2.6.10-rc2-mm1/drivers/net/r8169.c 2004-11-16 22:26:06.000000000
+0100
@@ -112,7 +112,8 @@ static int multicast_filter_limit = 32;
#define RX_DMA_BURST 6 /* Maximum PCI burst, '6' is 1024 */
#define TX_DMA_BURST 6 /* Maximum PCI burst, '6' is 1024 */
#define EarlyTxThld 0x3F /* 0x3F means NO early transmit */
-#define RxPacketMaxSize 0x3FE8 /* 16K - 1 - ETH_HLEN - VLAN - CRC */
+#define RxPacketMaxSize 0x3FE8 /* 16K - 1 - ETH_HLEN - VLAN - CRC... */
+#define SafeMtu 0x1964 /* ... actually life sucks beyond ~7k */
#define InterFrameGap 0x03 /* 3 means InterFrameGap = the shortest one */
#define R8169_REGS_SIZE 256
@@ -1592,9 +1593,9 @@ static int rtl8169_change_mtu(struct net
struct rtl8169_private *tp = netdev_priv(dev);
int ret = 0;
- if (new_mtu < ETH_ZLEN || new_mtu > RxPacketMaxSize)
+ if (new_mtu < ETH_ZLEN || new_mtu > SafeMtu)
return -EINVAL;
-
+
dev->mtu = new_mtu;
if (!netif_running(dev))
_
|