From: Michael S. Tsirkin Date: Wed, 21 Jul 2010 04:32:45 +0000 (+0000) Subject: tun: avoid BUG, dump packet on GSO errors X-Git-Tag: v2.6.35~25^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ef3db4a5954281bc1ea49a4739c88eaea091dc71;p=platform%2Fkernel%2Flinux-3.10.git tun: avoid BUG, dump packet on GSO errors There are still some LRO cards that cause GSO errors in tun, and BUG on this is an unfriendly way to tell the admin to disable LRO. Further, experience shows we might have more GSO bugs lurking. See https://bugzilla.kernel.org/show_bug.cgi?id=16413 as a recent example. dumping a packet will make it easier to figure it out. Replace BUG with warning+dump+drop the packet to make GSO errors in tun less critical and easier to debug. Signed-off-by: Michael S. Tsirkin Tested-by: Alex Unigovsky Acked-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 6ad6fe7..6304259 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -736,8 +736,18 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun, gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; else if (sinfo->gso_type & SKB_GSO_UDP) gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; - else - BUG(); + else { + printk(KERN_ERR "tun: unexpected GSO type: " + "0x%x, gso_size %d, hdr_len %d\n", + sinfo->gso_type, gso.gso_size, + gso.hdr_len); + print_hex_dump(KERN_ERR, "tun: ", + DUMP_PREFIX_NONE, + 16, 1, skb->head, + min((int)gso.hdr_len, 64), true); + WARN_ON_ONCE(1); + return -EINVAL; + } if (sinfo->gso_type & SKB_GSO_TCP_ECN) gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; } else