netdev - Re: [PATCH net-next v3 01/12] ethtool: add infrastructure for centralized checking of coalescing parameters

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Date:   Thu, 5 Mar 2020 14:27:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, ecree@...arflare.com, mkubecek@...e.cz,
        thomas.lendacky@....com, benve@...co.com, _govind@....com,
        peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, snelson@...sando.io, yisen.zhuang@...wei.com,
        salil.mehta@...wei.com, jeffrey.t.kirsher@...el.com,
        jacob.e.keller@...el.com, alexander.h.duyck@...ux.intel.com,
        michael.chan@...adcom.com, saeedm@...lanox.com, leon@...nel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 01/12] ethtool: add infrastructure for
 centralized checking of coalescing parameters

On Wed, Mar 04, 2020 at 09:15:31PM -0800, Jakub Kicinski wrote:
> Linux supports 22 different interrupt coalescing parameters.
> No driver implements them all. Some drivers just ignore the
> ones they don't support, while others have to carry a long
> list of checks to reject unsupported settings.
> 
> To simplify the drivers add the ability to specify inside
> ethtool_ops which parameters are supported and let the core
> reject attempts to set any other one.
> 
> This commit makes the mechanism an opt-in, only drivers which
> set ethtool_opts->coalesce_types to a non-zero value will have
> the checks enforced.
> 
> The same mask is used for global and per queue settings.
> 
> v3: - move the (temporary) check if driver defines types
>       earlier (Michal)
>     - rename used_types -> nonzero_params, and
>       coalesce_types -> supported_coalesce_params (Alex)
>     - use EOPNOTSUPP instead of EINVAL (Andrew, Michal)
> 
> Leaving the long series of ifs for now, it seems nice to
> be able to grep for the field and flag names. This will
> probably have to be revisited once netlink support lands.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew