netdev - Re: [PATCH bpf-next v4 5/7] samples/bpf: Add a "force" flag to XDP samples

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Date:   Tue, 29 Jan 2019 09:00:00 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Maciej Fijalkowski <maciejromanfijalkowski@...il.com>
Cc:     daniel@...earbox.net, ast@...nel.org, netdev@...r.kernel.org,
        jakub.kicinski@...ronome.com, brouer@...hat.com
Subject: Re: [PATCH bpf-next v4 5/7] samples/bpf: Add a "force" flag to XDP
 samples

On Mon, 28 Jan 2019 20:16:11 +0100
Maciej Fijalkowski <maciejromanfijalkowski@...il.com> wrote:

> From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> 
> Make xdp samples consistent with iproute2 behavior and set the
> XDP_FLAGS_UPDATE_IF_NOEXIST by default when setting the xdp program on
> interface. Provide an option for user to force the program loading,
> which as a result will not include the mentioned flag in
> bpf_set_link_xdp_fd call.

I like the idea, but what is the error message users get after this
change?

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer