netdev - Re: [xdp-hints] Re: [PATCH bpf-next v3 11/12] mlx5: Support RX XDP metadata

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Message-ID: <20221209141303.3c3bbb7b@kernel.org>
Date:   Fri, 9 Dec 2022 14:13:03 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Saeed Mahameed <saeedm@...dia.com>,
        David Ahern <dsahern@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [xdp-hints] Re: [PATCH bpf-next v3 11/12] mlx5: Support RX XDP
 metadata

On Fri, 9 Dec 2022 09:46:20 -0800 Stanislav Fomichev wrote:
> > Is partial inlining hard? (inline just the check and generate a full
> > call for the read, ending up with the same code as with _supported())  
> 
> I'm assuming you're suggesting to do this partial inlining manually
> (as in, writing the code to output this bytecode)?
> This probably also falls into the "manual bpf asm generation tech debt" bucket?
> LMK if I missed your point.

Maybe just ignore that, I'm not sure how the unrolling of 
the _supported() calls was expected to work in the first place.