netdev - Re: [PATCH v3] samples/bpf: Add xdp

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Message-ID: <2f05b54f-0b01-1f7e-d665-9e0e3c5ff7d8@iogearbox.net>
Date:   Mon, 17 Feb 2020 16:22:07 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Eric Sage <eric@...e.org>, bpf@...r.kernel.org
Cc:     ast@...nel.org, kafai@...com, yhs@...com, andriin@...com,
        jakub.kicinski@...ronome.com, hawk@...nel.org,
        john.fastabend@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3] samples/bpf: Add xdp_stat sample program

On 1/29/20 4:54 AM, Eric Sage wrote:
> At Facebook we use tail calls to jump between our firewall filters and
> our L4LB. This is a program I wrote to estimate per program performance
> by swapping out the entries in the program array with interceptors that
> take measurements and then jump to the original entries.
> 
> I found the sample programs to be invaluable in understanding how to use
> the libbpf API (as well as the test env from the xdp-tutorial repo for
> testing), and want to return the favor. I am currently working on
> my next iteration that uses fentry/fexit to be less invasive,
> but I thought it was an interesting PoC of what you can do with program
> arrays.
> 
> Signed-off-by: Eric Sage <eric@...e.org>

Now that bpf-next is back open, this needs a rebase for proceeding to get merged.

Thanks,
Daniel