Re: [PATCH v2 1/9] gpu: nova-core: gsp: cmdq: validate checksum earlier on receive

["Eliot Courtney" <ecourtney@nvidia.com>]

On Sun Sep 27, 2026 at 10:46 PM JST, Alexandre Courbot wrote:
> The checksum validation error message of `wait_for_msg` prints the
> message's sequence number before validating the checksum.
>
> But the checksum is part of the transport layer, and it not validating
> indicates a corruption that could very well be in the RPC message
> header, meaning the value of this field cannot be trusted.
>
> Furthermore, the transport layer is not supposed to know the kind of
> message it transports, and it accessing the RPC header is a layering
> violation.
>
> Thus, move the checksum validation before we start looking at the
> message header, and drop that information from the error message.
>
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---

N.B. this means that checking the length of the message (which uses the
payload length) almost always gets replaced with a bad checksum error.
But since we can't distinguish between corrupted data and something
wrong with the lengths, we can't do anything about it anyway so lgtm.
It also means we don't know which message had the bad checksum, but
again I think this fine too.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>