netdev - Re: tc: Using u32 filter

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Message-ID: <20180427150431.GB5632@nanopsycho.orion>
Date:   Fri, 27 Apr 2018 17:04:31 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: tc: Using u32 filter

Fri, Apr 27, 2018 at 04:15:46PM CEST, Jose.Abreu@...opsys.com wrote:
>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

Did you register a block cb?

>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