netdev - Re: [net-next 05/14] net/mlx5: DR, Allocate ste

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Message-ID: <20221024212419.003b3056@kernel.org>
Date:   Mon, 24 Oct 2022 21:24:19 -0700
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>,
        Yevgeny Kliteynik <kliteyn@...dia.com>,
        Alex Vesker <valex@...dia.com>
Subject: Re: [net-next 05/14] net/mlx5: DR, Allocate ste_arr on stack
 instead of dynamically

On Mon, 24 Oct 2022 14:57:25 +0100 Saeed Mahameed wrote:
> From: Yevgeny Kliteynik <kliteyn@...dia.com>
> 
> While creting rule, ste_arr is a short array that is allocated in
> the beginning of the function and freed at the end.
> To avoid memory allocation "hiccups" that sometimes take up to 10ms,
> allocate it on stack.

There's a reason, 32bit x86 does not like this:

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c: In function ‘dr_rule_create_rule_nic’:
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c:1202:1: warning: the frame size of 1568 bytes is larger than 1024 bytes [-Wframe-larger-than=]
1202 | }
     | ^