linux-kernel - Re: [PATCH net v2 6/8] net: stmmac: RX buffer size must be 16 byte aligned

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Date:   Tue, 17 Dec 2019 22:56:14 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     Jose.Abreu@...opsys.com
Cc:     netdev@...r.kernel.org, Joao.Pinto@...opsys.com,
        jakub.kicinski@...ronome.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, mcoquelin.stm32@...il.com,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2 6/8] net: stmmac: RX buffer size must be 16 byte
 aligned

From: Jose Abreu <Jose.Abreu@...opsys.com>
Date: Tue, 17 Dec 2019 12:42:36 +0100

> We need to align the RX buffer size to at least 16 byte so that IP
> doesn't mis-behave. This is required by HW.
 ...
>  
> -#define	STMMAC_ALIGN(x)		__ALIGN_KERNEL(x, SMP_CACHE_BYTES)
> +#define	STMMAC_ALIGN(x)		ALIGN_DOWN(ALIGN_DOWN(x, SMP_CACHE_BYTES), 16)

You need to align up, not down.