netdev - Re: [PATCH net-next v4 2/2] net: dsa: mv88e6xxx: Add devlink param for ATU hash algorithm.

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Date:   Sat, 19 Oct 2019 21:16:56 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next v4 2/2] net: dsa: mv88e6xxx: Add devlink param
 for ATU hash algorithm.

Sat, Oct 19, 2019 at 08:52:01PM CEST, andrew@...n.ch wrote:
>Some of the marvell switches have bits controlling the hash algorithm
>the ATU uses for MAC addresses. In some industrial settings, where all
>the devices are from the same manufacture, and hence use the same OUI,
>the default hashing algorithm is not optimal. Allow the other
>algorithms to be selected via devlink.
>
>Signed-off-by: Andrew Lunn <andrew@...n.ch>
>---
> .../networking/devlink-params-mv88e6xxx.txt   |   7 +
> MAINTAINERS                                   |   1 +
> drivers/net/dsa/mv88e6xxx/chip.c              | 132 +++++++++++++++++-
> drivers/net/dsa/mv88e6xxx/chip.h              |   4 +
> drivers/net/dsa/mv88e6xxx/global1.h           |   3 +
> drivers/net/dsa/mv88e6xxx/global1_atu.c       |  32 +++++
> 6 files changed, 178 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/networking/devlink-params-mv88e6xxx.txt
>
>diff --git a/Documentation/networking/devlink-params-mv88e6xxx.txt b/Documentation/networking/devlink-params-mv88e6xxx.txt
>new file mode 100644
>index 000000000000..b6e61108d781
>--- /dev/null
>+++ b/Documentation/networking/devlink-params-mv88e6xxx.txt
>@@ -0,0 +1,7 @@
>+address_translation_unit_hash	[DEVICE, DRIVER-SPECIFIC]

This is quite verbose. Can't you name this just "atu_hash" and be
aligned with the function names and MV88E6XXX_DEVLINK_PARAM_ID_ATU_HASH
and others?

Otherwise, the patch looks fine to me.

>+			Select one of four possible hashing algorithms for
>+			MAC addresses in the Address Translation Unit.
>+			A value of 3 seems to work better than the default of
>+			1 when many MAC addresses have the same OUI.
>+			Configuration mode: runtime
>+			Type: u8. 0-3 valid.

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