netdev - Re: [PATCH v7 bpf-next 0/9] introduce support for XDP programs in CPUMAP

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Date:   Tue, 14 Jul 2020 08:19:27 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        lorenzo.bianconi@...hat.com, David Ahern <dsahern@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH v7 bpf-next 0/9] introduce support for XDP programs in CPUMAP

On Tue, Jul 14, 2020 at 6:56 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> Similar to what David Ahern proposed in [1] for DEVMAPs, introduce the
> capability to attach and run a XDP program to CPUMAP entries.
> The idea behind this feature is to add the possibility to define on which CPU
> run the eBPF program if the underlying hw does not support RSS.
> I respin patch 1/6 from a previous series sent by David [2].
> The functionality has been tested on Marvell Espressobin, i40e and mlx5.
> Detailed tests results can be found here:
> https://github.com/xdp-project/xdp-project/blob/master/areas/cpumap/cpumap04-map-xdp-prog.org
>
> Changes since v6:
> - rebase on top of bpf-next
> - move bpf_cpumap_val and bpf_prog in the first bpf_cpu_map_entry cache-line

fyi. I'm waiting on Daniel to do one more look, since he commented in the past.