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([2601:282:803:7700:3d10:e33:29a2:f093]) by smtp.googlemail.com with ESMTPSA id w41sm11390279qtj.49.2020.02.03.20.52.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Feb 2020 20:53:01 -0800 (PST) Subject: Re: [RFC bpf-next 0/5] Convert iproute2 to use libbpf (WIP) To: Andrii Nakryiko Cc: =?UTF-8?Q?Toke_H=c3=b8iland-J=c3=b8rgensen?= , Daniel Borkmann , Stephen Hemminger , Alexei Starovoitov , Martin KaFai Lau , Song Liu , Yonghong Song , David Miller , Jesper Dangaard Brouer , Networking , bpf References: <20190820114706.18546-1-toke@redhat.com> <87blwiqlc8.fsf@toke.dk> <43e8c177-cc9c-ca0b-1622-e30a7a1281b7@iogearbox.net> <87tva8m85t.fsf@toke.dk> <87blqfcvnf.fsf@toke.dk> <0bf50b22-a8e2-e3b3-aa53-7bd5dd5d4399@gmail.com> From: David Ahern Message-ID: <2cf136a4-7f0e-f4b7-1ecb-6cbf6cb6c8ff@gmail.com> Date: Mon, 3 Feb 2020 21:52:58 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.4.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2/3/20 8:41 PM, Andrii Nakryiko wrote: > On Mon, Feb 3, 2020 at 5:46 PM David Ahern wrote: >> >> On 2/3/20 5:56 PM, Andrii Nakryiko wrote: >>> Great! Just to disambiguate and make sure we are in agreement, my hope >>> here is that iproute2 can completely delegate to libbpf all the ELF >>> >> >> iproute2 needs to compile and continue working as is when libbpf is not >> available. e.g., add check in configure to define HAVE_LIBBPF and move >> the existing code and move under else branch. > > Wouldn't it be better to statically compile against libbpf in this > case and get rid a lot of BPF-related code and simplify the rest of > it? This can be easily done by using libbpf through submodule, the > same way as BCC and pahole do it. > iproute2 compiles today and runs on older distributions and older distributions with newer kernels. That needs to hold true after the move to libbpf.