linux-kernel - Re: [net-next PATCH] net: phy: aquantia: drop wrong endianness conversion for addr and CRC

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Message-ID: <20231122102347.0bde86bb@kernel.org>
Date:   Wed, 22 Nov 2023 10:23:47 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Robert Marko <robimarko@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [net-next PATCH] net: phy: aquantia: drop wrong endianness
 conversion for addr and CRC

On Wed, 22 Nov 2023 18:53:39 +0100 Christian Marangi wrote:
> So they DO get converted to the HOST endian on reading the firmware from
> an nvmem cell or a filesystem?

They don't get converted when "reading from nvmem / fs". 
They get converted when you do:

		word = get_unaligned((const u32 *)(data + pos));

get_unaligned() is basically:

#if BIGENDIAN
#define		get_unaligned	get_unaligned_be32
#else
#define		get_unaligned	get_unaligned_le32
#endif

so you'll get different behavior here depending on the CPU.