netdev - Re: [PATCH bpf-next 3/3] samples: bpf: do not unload prog within xdpsock

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Date:   Tue, 16 Feb 2021 15:15:34 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Björn Töpel <bjorn.topel@...el.com>
Cc:     John Fastabend <john.fastabend@...il.com>, daniel@...earbox.net,
        ast@...nel.org, bpf@...r.kernel.org, netdev@...r.kernel.org,
        andrii@...nel.org, toke@...hat.com, magnus.karlsson@...el.com,
        ciara.loftus@...el.com
Subject: Re: [PATCH bpf-next 3/3] samples: bpf: do not unload prog within
 xdpsock

On Tue, Feb 16, 2021 at 10:22:15AM +0100, Björn Töpel wrote:
> On 2021-02-15 21:24, John Fastabend wrote:
> > Maciej Fijalkowski wrote:
> > > With the introduction of bpf_link in xsk's libbpf part, there's no
> > > further need for explicit unload of prog on xdpsock's termination. When
> > > process dies, the bpf_link's refcount will be decremented and resources
> > > will be unloaded/freed under the hood in case when there are no more
> > > active users.
> > > 
> > > While at it, don't dump stats on error path.
> > > 
> > > Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> > > ---
> > 
> > Can we also use it from selftests prog so we have a test that is run there
> > using this? Looks like xdpxceiver.c could do the link step as well?
> > 
> 
> Yes! Good point!

Somehow John's mail didn't end up in my inbox.
xdpxceiver is using libbpf API for socket handling (create/delete), so
with that set included it is working on bpf_link.

> 
> 
> Björn