netdev - Re: [net-next PATCH 00/10] BPF: sockmap and sk redirect support

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Date:   Wed, 16 Aug 2017 12:17:13 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     john.fastabend@...il.com, daniel@...earbox.net, ast@...com,
        tgraf@...g.ch, netdev@...r.kernel.org, tom@...bertland.com
Subject: Re: [net-next PATCH 00/10] BPF: sockmap and sk redirect support

On Wed, 2017-08-16 at 12:13 -0700, David Miller wrote:
> From: John Fastabend <john.fastabend@...il.com>
> Date: Wed, 16 Aug 2017 12:06:36 -0700
> 
> > On 08/16/2017 11:35 AM, David Miller wrote:
> >> From: David Miller <davem@...emloft.net>
> >> Date: Wed, 16 Aug 2017 11:28:19 -0700 (PDT)
> >> 
> >>> From: John Fastabend <john.fastabend@...il.com>
> >>> Date: Tue, 15 Aug 2017 22:30:15 -0700
> >>>
> >>>> This series implements a sockmap and socket redirect helper for BPF
> >>>> using a model similar to XDP netdev redirect.
> >>>
> >>> Series applied, thanks John.
> >>>
> >> 
> >> We get a legit warning from gcc due to these changes:
> >> 
> >> kernel/bpf/sockmap.c: In function ‘smap_state_change’:
> >> kernel/bpf/sockmap.c:156:21: warning: ‘psock’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> >>   struct smap_psock *psock;
> >> 
> >> It's the default switch case in this function, psock is not initialized
> >> for sure at this point.
> >> 
> > 
> > I missed this with older gcc4 it seems. Fixed now and compiling without errors
> > now with gcc4/5. Below is the diff and all verifier/sockmap tests pass. Want a
> > v2 I presume?
> 
> I already pushed out v1, so you'll need to send me a fixup patch.

I also have a build error.

$ git grep -n __sock_map_lookup_elem
include/linux/bpf.h:316:struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key);
kernel/bpf/sockmap.c:558:struct sock  *__sock_map_lookup_elem(struct bpf_map *map, u32 key)
net/core/filter.c:1881:         sk = __sock_map_lookup_elem(ri->map, ri->ifindex);



$ make ...
...
net/core/filter.c: In function ‘do_sk_redirect_map’:
net/core/filter.c:1881:3: error: implicit declaration of function ‘__sock_map_lookup_elem’ [-Werror=implicit-function-declaration]
   sk = __sock_map_lookup_elem(ri->map, ri->ifindex);
   ^
net/core/filter.c:1881:6: warning: assignment makes pointer from integer without a cast [enabled by default]
   sk = __sock_map_lookup_elem(ri->map, ri->ifindex);
      ^
cc1: some warnings being treated as errors
make[2]: *** [net/core/filter.o] Error 1
make[2]: *** Waiting for unfinished jobs....