netdev - Re: [net-next v7 4/4] mlx5: add support for page_pool_get

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Date:   Mon, 28 Feb 2022 00:38:37 -0800
From:   Joe Damato <jdamato@...tly.com>
To:     Jesper Dangaard Brouer <jbrouer@...hat.com>
Cc:     netdev@...r.kernel.org, kuba@...nel.org,
        ilias.apalodimas@...aro.org, davem@...emloft.net, hawk@...nel.org,
        saeed@...nel.org, ttoukan.linux@...il.com, brouer@...hat.com
Subject: Re: [net-next v7 4/4] mlx5: add support for page_pool_get_stats

On Sun, Feb 27, 2022 at 11:28 PM Jesper Dangaard Brouer
<jbrouer@...hat.com> wrote:
>
>
>
> On 25/02/2022 18.41, Joe Damato wrote:
> > +#ifdef CONFIG_PAGE_POOL_STATS
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_fast) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_slow) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_slow_high_order) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_empty) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_refill) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_waive) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_rec_cached) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_rec_cache_full) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_rec_ring) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_rec_ring_full) },
> > +     { MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, page_pool_rec_released_ref) },
> > +#endif
>
> The naming: "page_pool_rec_xxx".
> What does the "rec" stand for?

rec stands for recycle.

ethtool strings have a limited size (ETH_GSTRING_LEN - 32 bytes) and
the full word "recycle" didn't fit for some of the stats once the
queue number is prepended elsewhere in the driver code.

> Users of ethtool -S stats... will they know "rec" is "recycle" ?

I am open to other names or adding documentation to the driver docs to
explain the meaning.

> p.s. we need acks from driver maintainer(s).

I've CC'd Tariq and Saaed; I hope they'll take a look when they have a
chance and weigh in on the naming. I am happy to adjust the names as
they wish and submit a v8, or take this code as-is and then iterate on
the names in a separate change.

I think the latter option would be easiest, but I am happy to do
whatever you all prefer.

Thanks,
Joe