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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-05 20:04:05 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-12-09 13:33:34 -0800
commit1f72786efd70e91ba18e51da3bdf74d006253ddc (patch)
tree1caf31f0e3304dd424d6486847e0245047e75860
parent3f4e9a318d957c012b294fb27ac73b7ba2cfb5db (diff)
r8169: fix rx checksum offload
commit adea1ac7effbddbe60a9de6d63462bfe79289e59 upstream. While porting GRO to r8169, I found this driver has a bug in its rx path. All skbs given to network stack had their ip_summed set to CHECKSUM_NONE, while hardware said they had correct TCP/UDP checksums. The reason is driver sets skb->ip_summed on the original skb before the copy eventually done by copybreak. The fresh skb gets the ip_summed = CHECKSUM_NONE value, forcing network stack to recompute checksum, and preventing my GRO patch to work. Fix is to make the ip_summed setting after skb copy. Note : rx_copybreak current value is 16383, so all frames are copied... Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Francois Romieu <romieu@fr.zoreil.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/net/r8169.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 992db2fa136e..00bf3c58a497 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -4455,9 +4455,8 @@ static inline int rtl8169_fragmented_frame(u32 status)
return (status & (FirstFrag | LastFrag)) != (FirstFrag | LastFrag);
}
-static inline void rtl8169_rx_csum(struct sk_buff *skb, struct RxDesc *desc)
+static inline void rtl8169_rx_csum(struct sk_buff *skb, u32 opts1)
{
- u32 opts1 = le32_to_cpu(desc->opts1);
u32 status = opts1 & RxProtoMask;
if (((status == RxProtoTCP) && !(opts1 & TCPFail)) ||
@@ -4551,8 +4550,6 @@ static int rtl8169_rx_interrupt(struct net_device *dev,
continue;
}
- rtl8169_rx_csum(skb, desc);
-
if (rtl8169_try_rx_copy(&skb, tp, pkt_size, addr)) {
dma_sync_single_for_device(&pdev->dev, addr,
pkt_size, PCI_DMA_FROMDEVICE);
@@ -4563,6 +4560,7 @@ static int rtl8169_rx_interrupt(struct net_device *dev,
tp->Rx_skbuff[entry] = NULL;
}
+ rtl8169_rx_csum(skb, status);
skb_put(skb, pkt_size);
skb->protocol = eth_type_trans(skb, dev);