linux-kernel - Re: [PATCH V2 net 04/20] net/ena: fix ethtool RSS flow configuration

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Message-ID: <20161205041815.GE4310@u54ee753d2d1854bda401.ant.amazon.com>
Date:   Sun, 4 Dec 2016 20:18:15 -0800
From:   Matt Wilson <msw@...n.com>
To:     Netanel Belgazal <netanel@...apurnalabs.com>
CC:     <linux-kernel@...r.kernel.org>, <davem@...emloft.net>,
        <netdev@...r.kernel.org>, <dwmw@...zon.com>,
        <zorik@...apurnalabs.com>, <alex@...apurnalabs.com>,
        <saeed@...apurnalabs.com>, <msw@...zon.com>, <aliguori@...zon.com>,
        <nafea@...apurnalabs.com>
Subject: Re: [PATCH V2 net 04/20] net/ena: fix ethtool RSS flow configuration

On Sun, Dec 04, 2016 at 03:19:22PM +0200, Netanel Belgazal wrote:
> ena_flow_data_to_flow_hash and ena_flow_hash_to_flow_type
> treat the ena_flow_hash_to_flow_type enum as power of two values.
> 
> Change the values of ena_admin_flow_hash_fields to be power of two values.

Then I generally prefer BIT(0), BIT(1), BIT(2), etc.

Also it would be helpful to include some comments about the
consequences of the current state of the code.

--msw

> Signed-off-by: Netanel Belgazal <netanel@...apurnalabs.com>
> ---
>  drivers/net/ethernet/amazon/ena/ena_admin_defs.h | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
> index a46e749..f48c886 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
> +++ b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
> @@ -631,22 +631,22 @@ enum ena_admin_flow_hash_proto {
>  /* RSS flow hash fields */
>  enum ena_admin_flow_hash_fields {
>  	/* Ethernet Dest Addr */
> -	ENA_ADMIN_RSS_L2_DA	= 0,
> +	ENA_ADMIN_RSS_L2_DA	= 0x1,
>  
>  	/* Ethernet Src Addr */
> -	ENA_ADMIN_RSS_L2_SA	= 1,
> +	ENA_ADMIN_RSS_L2_SA	= 0x2,
>  
>  	/* ipv4/6 Dest Addr */
> -	ENA_ADMIN_RSS_L3_DA	= 2,
> +	ENA_ADMIN_RSS_L3_DA	= 0x4,
>  
>  	/* ipv4/6 Src Addr */
> -	ENA_ADMIN_RSS_L3_SA	= 5,
> +	ENA_ADMIN_RSS_L3_SA	= 0x8,
>  
>  	/* tcp/udp Dest Port */
> -	ENA_ADMIN_RSS_L4_DP	= 6,
> +	ENA_ADMIN_RSS_L4_DP	= 0x10,
>  
>  	/* tcp/udp Src Port */
> -	ENA_ADMIN_RSS_L4_SP	= 7,
> +	ENA_ADMIN_RSS_L4_SP	= 0x20,
>  };
>  
>  struct ena_admin_proto_input {