linux-kernel - Question on priorities with CAN

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Message-ID: <20190919084053.GB1446@x1.vandijck-laurijssen.be>
Date:   Thu, 19 Sep 2019 10:40:53 +0200
From:   Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be>
To:     linux-kernel@...r.kernel.org
Subject: Question on priorities with CAN

Hey,

I work on a beaglebone-like board using the AM335x can chip, with an RT
kernel.

The can irq task is by default rt prio 50.
I have a process running on rt prio 10 using CAN_RAW socket.

I see that softirqd runs on regular timeslicing.
Do CAN frames need to pass through the softirqd in order to arrive
on my process?
I would need to elevate the softirqd's rt prio also in that case?

Kind regards,
Kurt