On Tue, Jul 18, 2017 at 11:57:55AM +0200, Paolo Abeni wrote:
> Eric noticed that in udp_recvmsg() we still need to access
> skb->dst while processing the IP options.
> Since commit 0a463c78d25b ("udp: avoid a cache miss on dequeue")
> skb->dst is no more available at recvmsg() time and bad things
> will happen if we enter the relevant code path.
>
> This commit address the issue, avoid clearing skb->dst if
> any IP options are present into the relevant skb.
> Since the IP CB is contained in the first skb cacheline, we can
> test it to decide to leverage the consume_stateless_skb()
> optimization, without measurable additional cost in the faster
> path.
This doesn't seem to be enough for XFRM case. CMSG gets eaten up in
selinux-testsuite[1]/inet_socket test in ipsec configuration.
[1] https://github.com/SELinuxProject/selinux-testsuite.git
--
Regards,
Artem
