From 2d8f7e2c8a63131828e8d4e2d98835399f27319e Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Wed, 10 Sep 2014 21:23:18 -0500 Subject: [PATCH] udp: Fix inverted NAPI_GRO_CB(skb)->flush test Commit 2abb7cdc0d ("udp: Add support for doing checksum unnecessary conversion") caused napi_gro_cb structs with the "flush" field zero to take the "udp_gro_receive" path rather than the "set flush to 1" path that they would previously take. As a result I saw booting from an NFS root hang shortly after starting userspace, with "server not responding" messages. This change to the handling of "flush == 0" packets appears to be incidental to the goal of adding new code in the case where skb_gro_checksum_validate_zero_check() returns zero. Based on that and the fact that it breaks things, I'm assuming that it is unintentional. Fixes: 2abb7cdc0d ("udp: Add support for doing checksum unnecessary conversion") Cc: Tom Herbert Signed-off-by: Scott Wood Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/udp_offload.c | 2 +- net/ipv6/udp_offload.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index 52d5f46abf86..adab393b2fe5 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -294,7 +294,7 @@ static struct sk_buff **udp4_gro_receive(struct sk_buff **head, goto flush; /* Don't bother verifying checksum if we're going to flush anyway. */ - if (!NAPI_GRO_CB(skb)->flush) + if (NAPI_GRO_CB(skb)->flush) goto skip; if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index a1ad34b1c4ec..de85f809bf29 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -138,7 +138,7 @@ static struct sk_buff **udp6_gro_receive(struct sk_buff **head, goto flush; /* Don't bother verifying checksum if we're going to flush anyway. */ - if (!NAPI_GRO_CB(skb)->flush) + if (NAPI_GRO_CB(skb)->flush) goto skip; if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check, -- 2.20.1