From e2db86fdddfbf179ebc8e717b50770cf7acf78b6 Mon Sep 17 00:00:00 2001 From: Raimonds Cicans Date: Fri, 13 Nov 2009 10:52:19 +0000 Subject: r8169: Fix receive buffer length when MTU is between 1515 and 1536 commit 8812304cf1110ae16b0778680f6022216cf4716a upstream. In r8169 driver MTU is used to calculate receive buffer size. Receive buffer size is used to configure hardware incoming packet filter. For jumbo frames: Receive buffer size = Max frame size = MTU + 14 (ethernet header) + 4 (vlan header) + 4 (ethernet checksum) = MTU + 22 Bug: driver for all MTU up to 1536 use receive buffer size 1536 As you can see from formula, this mean all IP packets > 1536 - 22 (for vlan tagged, 1536 - 18 for not tagged) are dropped by hardware filter. Example: host_good> ifconfig eth0 mtu 1536 host_r8169> ifconfig eth0 mtu 1536 host_good> ping host_r8169 Ok host_good> ping -s 1500 host_r8169 Fail host_good> ifconfig eth0 mtu 7000 host_r8169> ifconfig eth0 mtu 7000 host_good> ping -s 1500 host_r8169 Ok Bonus: got rid of magic number 8 Signed-off-by: Raimonds Cicans Signed-off-by: David S. Miller Cc: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/net/r8169.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c index f7182155253..68bba7f9a64 100644 --- a/drivers/net/r8169.c +++ b/drivers/net/r8169.c @@ -1842,9 +1842,9 @@ static void __devexit rtl8169_remove_one(struct pci_dev *pdev) static void rtl8169_set_rxbufsize(struct rtl8169_private *tp, struct net_device *dev) { - unsigned int mtu = dev->mtu; + unsigned int max_frame = dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; - tp->rx_buf_sz = (mtu > RX_BUF_SIZE) ? mtu + ETH_HLEN + 8 : RX_BUF_SIZE; + tp->rx_buf_sz = (max_frame > RX_BUF_SIZE) ? max_frame : RX_BUF_SIZE; } static int rtl8169_open(struct net_device *dev) -- cgit v1.2.3-18-g5258