linux-kernel - Re: [RFC net-next v3 1/2] net/mlx5e: Add helpers to calculate txq and ch idx

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Date: Sat, 1 Jun 2024 12:35:57 +0100
From: Simon Horman <horms@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	nalramli@...tly.com, Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	"open list:MELLANOX MLX5 core VPI driver" <linux-rdma@...r.kernel.org>
Subject: Re: [RFC net-next v3 1/2] net/mlx5e: Add helpers to calculate txq
 and ch idx

On Wed, May 29, 2024 at 03:16:26AM +0000, Joe Damato wrote:
> Add two helpers to:
> 
> 1. Compute the txq_ix given a channel and a tc offset (tc_to_txq_ix).
> 2. Compute the channel index and tc offset given a txq_ix
>    (txq_ix_to_chtc_ix).
> 
> The first helper, tc_to_txq_ix, is used in place of the mathematical
> expressionin mlx5e_open_sqs when txq_ix values are computed.
> 
> The second helper, txq_ix_to_chtc_ix, will be used in a following patch.

Hi Joe,

I think it would be best to add txq_ix_to_chtc_ix as part of patch that
uses it, because the current arrangement will cause allmodconfigs with
clang-18 and W=1 to fail due to txq_ix_to_chtc_ix being unused.

...