From: John Fastabend <[email protected]>
Date: Wed, 16 Aug 2017 11:33:19 -0700
> do_xdp_generic must be called inside rcu critical section with preempt
> disabled to ensure BPF programs are valid and per-cpu variables used
> for redirect operations are consistent. This patch ensures this is true
> and fixes the splat below.
>
> The netif_receive_skb_internal() code path is now broken into two rcu
> critical sections. I decided it was better to limit the preempt_enable/disable
> block to just the xdp static key portion and the fallout is more
> rcu_read_lock/unlock calls. Seems like the best option to me.
...
> Fixes: d445516966dc ("net: xdp: support xdp generic on virtual devices")
> Fixes: b5cdae3291f7 ("net: Generic XDP")
> Signed-off-by: John Fastabend <[email protected]>
John you'll need to respin this as these code blocks have changed.
