netdev - Re: [PATCH net-next] bpf, xdp: allow to pass flags to dev_change_xdp

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Date:   Wed, 30 Nov 2016 10:27:42 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     alexei.starovoitov@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bpf, xdp: allow to pass flags to
 dev_change_xdp_fd

From: Daniel Borkmann <daniel@...earbox.net>
Date: Mon, 28 Nov 2016 23:16:54 +0100

> Add an IFLA_XDP_FLAGS attribute that can be passed for setting up
> XDP along with IFLA_XDP_FD, which eventually allows user space to
> implement typical add/replace/delete logic for programs. Right now,
> calling into dev_change_xdp_fd() will always replace previous programs.
> 
> When passed XDP_FLAGS_UPDATE_IF_NOEXIST, we can handle this more
> graceful when requested by returning -EBUSY in case we try to
> attach a new program, but we find that another one is already
> attached. This will be used by upcoming front-end for iproute2 as
> well.
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Alexei Starovoitov <ast@...nel.org>

Applied, thanks Daniel.