netdev - Re: [PATCH v4 bpf-next 3/3] selftests/bpf: Add selftest for bpf_xdp_flow

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Date: Thu, 13 Jun 2024 18:06:29 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org
Cc: pablo@...filter.org, kadlec@...filter.org, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 netfilter-devel@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com,
 lorenzo.bianconi@...hat.com, toke@...hat.com, fw@...len.de, hawk@...nel.org,
 horms@...nel.org, donhunte@...hat.com, memxor@...il.com
Subject: Re: [PATCH v4 bpf-next 3/3] selftests/bpf: Add selftest for
 bpf_xdp_flow_lookup kfunc

On 5/29/24 3:04 PM, Lorenzo Bianconi wrote:
> Introduce e2e selftest for bpf_xdp_flow_lookup kfunc through
> xdp_flowtable utility.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
[...]
> +struct flow_offload_tuple_rhash *
> +bpf_xdp_flow_lookup(struct xdp_md *, struct bpf_fib_lookup *,
> +		    struct bpf_flowtable_opts___local *, u32) __ksym;

Btw, this fails CI build :

https://github.com/kernel-patches/bpf/actions/runs/9499749947/job/26190382116

   [...]
   progs/xdp_flowtable.c:20:1: error: conflicting types for 'bpf_xdp_flow_lookup'
      20 | bpf_xdp_flow_lookup(struct xdp_md *, struct bpf_fib_lookup *,
         | ^
   /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:106755:41: note: previous declaration is here
    106755 | extern struct flow_offload_tuple_rhash *bpf_xdp_flow_lookup(struct xdp_md *ctx, struct bpf_fib_lookup *fib_tuple, struct bpf_flowtable_opts *opts, u32 opts_len) __weak __ksym;
           |                                         ^
   progs/xdp_flowtable.c:134:47: error: incompatible pointer types passing 'struct bpf_flowtable_opts___local *' to parameter of type 'struct bpf_flowtable_opts *' [-Werror,-Wincompatible-pointer-types]
     134 |         tuplehash = bpf_xdp_flow_lookup(ctx, &tuple, &opts, sizeof(opts));
         |                                                      ^~~~~
   /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:106755:142: note: passing argument to parameter 'opts' here
    106755 | extern struct flow_offload_tuple_rhash *bpf_xdp_flow_lookup(struct xdp_md *ctx, struct bpf_fib_lookup *fib_tuple, struct bpf_flowtable_opts *opts, u32 opts_len) __weak __ksym;
           |                                                                                                                                              ^
   2 errors generated.
     CLNG-BPF [test_maps] kprobe_multi_override.bpf.o
     CLNG-BPF [test_maps] tailcall_bpf2bpf1.bpf.o
   make: *** [Makefile:654: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/xdp_flowtable.bpf.o] Error 1
   make: *** Waiting for unfinished jobs....
   make: Leaving directory '/tmp/work/bpf/bpf/tools/testing/selftests/bpf'
   Error: Process completed with exit code 2.