netdev - Re: [PATCH net-next 2/6] mlxsw: reg: Add Management Capabilities Mask Register

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Date:   Sun, 26 Mar 2023 16:02:26 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Petr Machata <petrm@...dia.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Ido Schimmel <idosch@...dia.com>,
        Amit Cohen <amcohen@...dia.com>, mlxsw@...dia.com
Subject: Re: [PATCH net-next 2/6] mlxsw: reg: Add Management Capabilities
 Mask Register

On Wed, Mar 22, 2023 at 05:49:31PM +0100, Petr Machata wrote:
> From: Amit Cohen <amcohen@...dia.com>
> 
> MCAM register reports the device supported management features. Querying
> this register exposes if features are supported with the current firmware
> version in the current ASIC. Then, the drive can separate between different
> implementations dynamically.
> 
> MCAM register supports querying whether a new reset flow (which includes
> PCI reset) is supported or not. Add support for the register as preparation
> for support of the new reset flow.
> 
> Note that the access to the bits in the field 'mng_feature_cap_mask' is
> not same to other mask fields in other registers. In most of the cases
> bit #0 is the first one in the last dword, in MCAM register, bits #0-#31
> are in the first dword and so on. Declare the mask field using bits arrays
> per dword to simplify the access.
> 
> Signed-off-by: Amit Cohen <amcohen@...dia.com>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>

I'm fine with this patch, and offered a Reviewed-by tag in another email.
But when sending that I forgot the minor nit below.
Please regard it as informational only.

> ---
>  drivers/net/ethernet/mellanox/mlxsw/reg.h | 74 +++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
> index 0d7d5e28945a..c4446085ebc5 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
> +++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h

...

> +static inline void
> +mlxsw_reg_mcam_unpack(char *payload,
> +		      enum mlxsw_reg_mcam_mng_feature_cap_mask_bits bit,
> +		      bool *p_mng_feature_cap_val)
> +{
> +	int offset = bit % (MLXSW_REG_BYTES_PER_DWORD * BITS_PER_BYTE);
> +	int dword = bit / (MLXSW_REG_BYTES_PER_DWORD * BITS_PER_BYTE);

nit: checkpatch seems mildly upset that there is no blank line here.

> +	u8 (*getters[])(const char *, u16) = {
> +		mlxsw_reg_mcam_mng_feature_cap_mask_dw0_get,
> +		mlxsw_reg_mcam_mng_feature_cap_mask_dw1_get,
> +		mlxsw_reg_mcam_mng_feature_cap_mask_dw2_get,
> +		mlxsw_reg_mcam_mng_feature_cap_mask_dw3_get,
> +	};