From: Eric Dumazet Date: Mon, 6 Sep 2010 03:04:05 +0000 (-0700) Subject: r8169: fix rx checksum offload X-Git-Tag: v2.6.37-rc1~147^2~573 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=adea1ac7effbddbe60a9de6d63462bfe79289e59;p=platform%2Fkernel%2Flinux-3.10.git r8169: fix rx checksum offload 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 Acked-by: Francois Romieu Signed-off-by: David S. Miller --- diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c index 07b3fb5..56a11e2 100644 --- a/drivers/net/r8169.c +++ b/drivers/net/r8169.c @@ -4450,9 +4450,8 @@ 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)) || @@ -4546,8 +4545,6 @@ 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)) { pci_dma_sync_single_for_device(pdev, addr, pkt_size, PCI_DMA_FROMDEVICE); @@ -4558,6 +4555,7 @@ 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);