netdev - Re: [PATCH bpf-next v4 00/17] AF_XDP infrastructure improvements and mlx5e support

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Date:   Wed, 12 Jun 2019 12:10:13 -0700
From:   "Jonathan Lemon" <jonathan.lemon@...il.com>
To:     "Maxim Mikityanskiy" <maximmi@...lanox.com>
Cc:     "Alexei Starovoitov" <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        "Björn Töpel" <bjorn.topel@...el.com>,
        "Magnus Karlsson" <magnus.karlsson@...el.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        "Saeed Mahameed" <saeedm@...lanox.com>,
        "Tariq Toukan" <tariqt@...lanox.com>,
        "Martin KaFai Lau" <kafai@...com>,
        "Song Liu" <songliubraving@...com>, "Yonghong Song" <yhs@...com>,
        "Jakub Kicinski" <jakub.kicinski@...ronome.com>,
        "Maciej Fijalkowski" <maciejromanfijalkowski@...il.com>
Subject: Re: [PATCH bpf-next v4 00/17] AF_XDP infrastructure improvements and
 mlx5e support

On 12 Jun 2019, at 8:56, Maxim Mikityanskiy wrote:

> This series contains improvements to the AF_XDP kernel infrastructure
> and AF_XDP support in mlx5e. The infrastructure improvements are
> required for mlx5e, but also some of them benefit to all drivers, and
> some can be useful for other drivers that want to implement AF_XDP.
>
> The performance testing was performed on a machine with the following
> configuration:
>
> - 24 cores of Intel Xeon E5-2620 v3 @ 2.40 GHz
> - Mellanox ConnectX-5 Ex with 100 Gbit/s link
>
> The results with retpoline disabled, single stream:
>
> txonly: 33.3 Mpps (21.5 Mpps with queue and app pinned to the same CPU)
> rxdrop: 12.2 Mpps
> l2fwd: 9.4 Mpps
>
> The results with retpoline enabled, single stream:
>
> txonly: 21.3 Mpps (14.1 Mpps with queue and app pinned to the same CPU)
> rxdrop: 9.9 Mpps
> l2fwd: 6.8 Mpps
>
> v2 changes:
>
> Added patches for mlx5e and addressed the comments for v1. Rebased for
> bpf-next.
>
> v3 changes:
>
> Rebased for the newer bpf-next, resolved conflicts in libbpf. Addressed
> Björn's comments for coding style. Fixed a bug in error handling flow in
> mlx5e_open_xsk.
>
> v4 changes:
>
> UAPI is not changed, XSK RX queues are exposed to the kernel. The lower
> half of the available amount of RX queues are regular queues, and the
> upper half are XSK RX queues. The patch "xsk: Extend channels to support
> combined XSK/non-XSK traffic" was dropped. The final patch was reworked
> accordingly.
>
> Added "net/mlx5e: Attach/detach XDP program safely", as the changes
> introduced in the XSK patch base on the stuff from this one.
>
> Added "libbpf: Support drivers with non-combined channels", which aligns
> the condition in libbpf with the condition in the kernel.
>
> Rebased over the newer bpf-next.

Very nice change for the RX queues!
For the series:

Tested-by: Jonathan Lemon <jonathan.lemon@...il.com>