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authorHerbert Xu <herbert@gondor.apana.org.au>2005-11-11 00:01:24 +0300
committerDavid S. Miller <davem@davemloft.net>2005-11-11 00:01:24 +0300
commitfb286bb2990a107009dbf25f6ffebeb7df77f9be (patch)
tree0eede2c37f1b3831e59601933eebf6b82be75ffc /net/ipv4/ip_gre.c
parent1064e944d03eb7a72c0fa11236d5e69cfd877a71 (diff)
downloadlinux-fb286bb2990a107009dbf25f6ffebeb7df77f9be.tar.xz
[NET]: Detect hardware rx checksum faults correctly
Here is the patch that introduces the generic skb_checksum_complete which also checks for hardware RX checksum faults. If that happens, it'll call netdev_rx_csum_fault which currently prints out a stack trace with the device name. In future it can turn off RX checksum. I've converted every spot under net/ that does RX checksum checks to use skb_checksum_complete or __skb_checksum_complete with the exceptions of: * Those places where checksums are done bit by bit. These will call netdev_rx_csum_fault directly. * The following have not been completely checked/converted: ipmr ip_vs netfilter dccp This patch is based on patches and suggestions from Stephen Hemminger and David S. Miller. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 896ce3f8f53a..4e9c74b54b15 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -577,15 +577,16 @@ static int ipgre_rcv(struct sk_buff *skb)
goto drop_nolock;
if (flags&GRE_CSUM) {
- if (skb->ip_summed == CHECKSUM_HW) {
+ switch (skb->ip_summed) {
+ case CHECKSUM_HW:
csum = (u16)csum_fold(skb->csum);
- if (csum)
- skb->ip_summed = CHECKSUM_NONE;
- }
- if (skb->ip_summed == CHECKSUM_NONE) {
- skb->csum = skb_checksum(skb, 0, skb->len, 0);
+ if (!csum)
+ break;
+ /* fall through */
+ case CHECKSUM_NONE:
+ skb->csum = 0;
+ csum = __skb_checksum_complete(skb);
skb->ip_summed = CHECKSUM_HW;
- csum = (u16)csum_fold(skb->csum);
}
offset += 4;
}