netdev - Re: [PATCH iproute2-next 3/5] lib: add libbpf support

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Date:   Tue, 27 Oct 2020 10:58:45 +0800
From:   Hangbin Liu <haliu@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Jiri Benc <jbenc@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH iproute2-next 3/5] lib: add libbpf support

On Mon, Oct 26, 2020 at 09:15:00AM -0600, David Ahern wrote:
> >> actually, it already does: bpf_load_program
> > 
> > Thanks for this info. Do you want to convert ipvrf.c to:
> > 
> > @@ -256,8 +262,13 @@ static int prog_load(int idx)
> >  		BPF_EXIT_INSN(),
> >  	};
> >  
> > +#ifdef HAVE_LIBBPF
> > +	return bpf_load_program(BPF_PROG_TYPE_CGROUP_SOCK, prog, sizeof(prog),
> > +				"GPL", 0, bpf_log_buf, sizeof(bpf_log_buf));
> > +#else
> >  	return bpf_prog_load_buf(BPF_PROG_TYPE_CGROUP_SOCK, prog, sizeof(prog),
> >  			         "GPL", bpf_log_buf, sizeof(bpf_log_buf));
> > +#endif
> >  }
> >  
> >  static int vrf_configure_cgroup(const char *path, int ifindex)
> > @@ -288,7 +299,11 @@ static int vrf_configure_cgroup(const char *path, int ifindex)
> >  		goto out;
> >  	}
> >  
> > +#ifdef HAVE_LIBBPF
> > +	if (bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_INET_SOCK_CREATE, 0)) {
> > +#else
> >  	if (bpf_prog_attach_fd(prog_fd, cg_fd, BPF_CGROUP_INET_SOCK_CREATE)) {
> > +#endif
> >  		fprintf(stderr, "Failed to attach prog to cgroup: '%s'\n",
> >  			strerror(errno));
> >  		goto out;
> > 
> 
> works for me. The rename in patch 2 can be dropped as well correct?
> 

No, the BPF_MOV64_* micros are not defined in uapi, so we still need include
"bpf_util.h", which will got bpf_prog_load() conflicts.

Thanks
Hangbin