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

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Date:   Wed, 16 Aug 2017 15:35:43 -0600
From:   David Ahern <dsahern@...il.com>
To:     John Fastabend <john.fastabend@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     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 8/16/17 1:34 PM, John Fastabend wrote:
>> 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....
>>
>>
> 
> Thanks Eric, I'll have a fix shortly.
> 

And I have a different build error:

$ make O=kbuild/rcu-lock-debug/ -j24 -s
scripts/Makefile.kasan:25: CONFIG_KASAN: compiler does not support all
options. Trying minimal configuration
scripts/Makefile.kasan:25: CONFIG_KASAN: compiler does not support all
options. Trying minimal configuration
kernel/bpf/sockmap.o: In function `smap_stop_sock':
/home/dsa/kernel-2.git/kernel/bpf/sockmap.c:297: undefined reference to
`strp_stop'
kernel/bpf/sockmap.o: In function `smap_gc_work':
/home/dsa/kernel-2.git/kernel/bpf/sockmap.c:419: undefined reference to
`strp_done'
kernel/bpf/sockmap.o: In function `smap_data_ready':
/home/dsa/kernel-2.git/kernel/bpf/sockmap.c:216: undefined reference to
`strp_data_ready'
kernel/bpf/sockmap.o: In function `smap_init_sock':
/home/dsa/kernel-2.git/kernel/bpf/sockmap.c:373: undefined reference to
`strp_init'
/home/dsa/kernel-2.git/Makefile:1000: recipe for target 'vmlinux' failed
make[1]: *** [vmlinux] Error 1
Makefile:145: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2

I'm guessing a missing CONFIG tie in.