netdev - Re: [PATCH v5 net-nex 0/5] xdp: introduce bulking for page

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Date:   Tue, 10 Nov 2020 16:50:52 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, lorenzo.bianconi@...hat.com,
        ilias.apalodimas@...aro.org, brouer@...hat.com
Subject: Re: [PATCH v5 net-nex 0/5] xdp: introduce bulking for page_pool tx
 return path

On Tue, 10 Nov 2020 16:37:55 +0100
Lorenzo Bianconi <lorenzo@...nel.org> wrote:

> XDP bulk APIs introduce a defer/flush mechanism to return
> pages belonging to the same xdp_mem_allocator object
> (identified via the mem.id field) in bulk to optimize
> I-cache and D-cache since xdp_return_frame is usually run
> inside the driver NAPI tx completion loop.
> Convert mvneta, mvpp2 and mlx5 drivers to xdp_return_frame_bulk APIs.

Series

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

> Changes since v4:
> - fix comments
> - introduce xdp_frame_bulk_init utility routine
> - compiler annotations for I-cache code layout
> - move rcu_read_lock outside fast-path
> - mlx5 xdp bulking code optimization

I've done a lot of these changes, and benchmarked them on mlx5, details in[1].

[1] https://github.com/xdp-project/xdp-project/blob/master/areas/mem/xdp_bulk_return01.org

> Changes since v3:
> - align DEV_MAP_BULK_SIZE to XDP_BULK_QUEUE_SIZE
> - refactor page_pool_put_page_bulk to avoid code duplication
> 
> Changes since v2:
> - move mvneta changes in a dedicated patch
> 
> Changes since v1:
> - improve comments
> - rework xdp_return_frame_bulk routine logic
> - move count and xa fields at the beginning of xdp_frame_bulk struct
> - invert logic in page_pool_put_page_bulk for loop
> 
> Lorenzo Bianconi (5):
>   net: xdp: introduce bulking for xdp tx return path
>   net: page_pool: add bulk support for ptr_ring
>   net: mvneta: add xdp tx return bulking support
>   net: mvpp2: add xdp tx return bulking support
>   net: mlx5: add xdp tx return bulking support
> 
>  drivers/net/ethernet/marvell/mvneta.c         | 10 ++-
>  .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 10 ++-
>  .../net/ethernet/mellanox/mlx5/core/en/xdp.c  | 22 ++++--
>  include/net/page_pool.h                       | 26 +++++++
>  include/net/xdp.h                             | 17 ++++-
>  net/core/page_pool.c                          | 69 ++++++++++++++++---
>  net/core/xdp.c                                | 54 +++++++++++++++
>  7 files changed, 191 insertions(+), 17 deletions(-)
> 



-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer