netdev - tc: Using u32 filter

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Date:   Fri, 27 Apr 2018 15:15:46 +0100
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>
Subject: tc: Using u32 filter

Hi,

I'm trying to use u32 filter to filter specific fields of packets
by HW *only* but I'm having a hard time in trying to run tc to
configure it.
I implemented a dummy .ndo_setup_tc callback which always returns
success and I set NETIF_F_HW_TC field in hw_features. Then I run
tc, like this:

    # tc filter add dev eth0 u32 skip_sw sample u32 20 ffff at 0

At this stage I'm not really caring about the packet content (the
"20 ffff at 0"), I just want to see the configuration reaching my
driver but I'm getting a "RTNETLINK answers: Operation not
supported" error.

Can you tell me what I'm I doing wrong?

Thanks and Best Regards,
Jose Miguel Abreu