netdev - Re: [net 07/10] net/mlx5e: Correct SKB room check to use all room in the fifo

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Date:   Thu, 23 Feb 2023 16:38:36 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Rahul Rameshbabu <rrameshbabu@...dia.com>
Subject: Re: [net 07/10] net/mlx5e: Correct SKB room check to use all room
 in the fifo

On Thu, 23 Feb 2023 14:52:44 -0800 Saeed Mahameed wrote:
> From: Rahul Rameshbabu <rrameshbabu@...dia.com>
> 
> Previous check was comparing against the fifo mask. The mask is size of the
> fifo (power of two) minus one, so a less than or equal comparator should be
> used for checking if the fifo has room for the SKB.
> 
> Fixes: 19b43a432e3e ("net/mlx5e: Extend SKB room check to include PTP-SQ")

How big is the fifo? Not utilizing a single entry is not really worth
calling a bug if the fifo has at least 32 entries..