Re: [PATCH bpf-next v2 2/3] bpf: xdp, virtio_net use access ptr macro for xdp enable check
From: Jesper Dangaard Brouer <hidden>
Date: 2020-01-26 21:29:03
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bpf
On Sat, 25 Jan 2020 19:58:52 -0800 John Fastabend [off-list ref] wrote:
virtio_net currently relies on rcu critical section to access the xdp program in its xdp_xmit handler. However, the pointer to the xdp program is only used to do a NULL pointer comparison to determine if xdp is enabled or not. Use rcu_access_pointer() instead of rcu_dereference() to reflect this. Then later when we drop rcu_read critical section virtio_net will not need in special handling. Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jesper Dangaard Brouer <redacted> -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer