From bfaffe8fae0273b57f2146d1759cbd25d07c81e9 Mon Sep 17 00:00:00 2001 From: Ayaz Abdulla Date: Sun, 13 Jan 2008 16:02:55 -0500 Subject: [PATCH] forcedeth: checksum fix The driver should inform the stack when checksum has been performed by the HW when both IP and TCP (or UDP) checksum flags are indicated by HW. Previously, it would also inform the stack when only IP checksum flag was indicated by HW. This can cause data corruption when IP fragments are used. The IP Identification field can wrap around and cause data from new fragments to fill into older fragment slots with same IP Id. The stack would then not perform TCP/UDP checksum (after re-assembly of all fragments) since driver falsely stated it was already calculated. Signed-off-by: Ayaz Abdulla Signed-off-by: Jeff Garzik Signed-off-by: David S. Miller --- drivers/net/forcedeth.c | 24 +++++++----------------- 1 file changed, 7 insertions(+), 17 deletions(-) diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index ce3f25ff27..d73ca24396 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -471,9 +471,9 @@ union ring_type { #define NV_RX_AVAIL (1<<31) #define NV_RX2_CHECKSUMMASK (0x1C000000) -#define NV_RX2_CHECKSUMOK1 (0x10000000) -#define NV_RX2_CHECKSUMOK2 (0x14000000) -#define NV_RX2_CHECKSUMOK3 (0x18000000) +#define NV_RX2_CHECKSUM_IP (0x10000000) +#define NV_RX2_CHECKSUM_IP_TCP (0x14000000) +#define NV_RX2_CHECKSUM_IP_UDP (0x18000000) #define NV_RX2_DESCRIPTORVALID (1<<29) #define NV_RX2_SUBSTRACT1 (1<<25) #define NV_RX2_ERROR1 (1<<18) @@ -2375,14 +2375,9 @@ static int nv_rx_process(struct net_device *dev, int limit) goto next_pkt; } } - if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK2)/*ip and tcp */ { + if (((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_TCP) || /*ip and tcp */ + ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_UDP)) /*ip and udp */ skb->ip_summed = CHECKSUM_UNNECESSARY; - } else { - if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK1 || - (flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK3) { - skb->ip_summed = CHECKSUM_UNNECESSARY; - } - } } else { dev_kfree_skb(skb); goto next_pkt; @@ -2474,14 +2469,9 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit) } } - if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK2)/*ip and tcp */ { + if (((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_TCP) || /*ip and tcp */ + ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUM_IP_UDP)) /*ip and udp */ skb->ip_summed = CHECKSUM_UNNECESSARY; - } else { - if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK1 || - (flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK3) { - skb->ip_summed = CHECKSUM_UNNECESSARY; - } - } /* got a valid packet - forward it to the network core */ skb_put(skb, len); -- 2.39.5