netdev - Re: [PATCH 10/34] brcmfmac: firmware: Allow platform to override macaddr

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Date:   Mon, 3 Jan 2022 14:42:38 +0900
From:   Hector Martin <marcan@...can.st>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH 10/34] brcmfmac: firmware: Allow platform to override
 macaddr

On 2022/01/02 14:50, Linus Walleij wrote:
> On Sun, Dec 26, 2021 at 4:37 PM Hector Martin <marcan@...can.st> wrote:
> 
>> On Device Tree platforms, it is customary to be able to set the MAC
>> address via the Device Tree, as it is often stored in system firmware.
>> This is particularly relevant for Apple ARM64 platforms, where this
>> information comes from system configuration and passed through by the
>> bootloader into the DT.
>>
>> Implement support for this by fetching the platform MAC address and
>> adding or replacing the macaddr= property in nvram. This becomes the
>> dongle's default MAC address.
>>
>> On platforms with an SROM MAC address, this overrides it. On platforms
>> without one, such as Apple ARM64 devices, this is required for the
>> firmware to boot (it will fail if it does not have a valid MAC at all).
>>
>> Signed-off-by: Hector Martin <marcan@...can.st>
> 
> This looks very helpful.
> 
>> +       /* Add space for properties we may add */
>> +       size += strlen(BRCMF_FW_DEFAULT_BOARDREV) + 1;
>> +       size += BRCMF_FW_MACADDR_LEN + 1;
> 
> Add some note to the commit log why you also make space for
> boardrev? (Looks useful.) Is the boardrev spacing in the right
> patch?

Ah, that was a drive-by fix. While adding the MACADDR space I noticed we
weren't allocating space for BOARDREV... not sure if any platforms hit
this; it would cause an overflow if there are platforms with no
board_rev in the nvram that also don't have enough comments/junk to
otherwise make space for it.

I'll move it to another patch so it's more evident, and it should get a
Fixes: too.

-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub