linux-kernel - Re: [PATCH net-next] net: dsa: Remove indirect function call for flow dissection

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Date:   Sun, 05 Jan 2020 14:25:31 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org, alobakin@...nk.ru,
        rmk+kernel@...linux.org.uk, andrew@...n.ch,
        vivien.didelot@...il.com, hauke@...ke-m.de,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        sean.wang@...iatek.com, matthias.bgg@...il.com,
        vladimir.oltean@....com, claudiu.manoil@....com, sdf@...gle.com,
        daniel@...earbox.net, songliubraving@...com, ppenkov@...gle.com,
        mcroce@...hat.com, jakub@...udflare.com, edumazet@...gle.com,
        paulb@...lanox.com, komachi.yoshiki@...il.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next] net: dsa: Remove indirect function call for
 flow dissection

From: Florian Fainelli <f.fainelli@...il.com>
Date: Thu,  2 Jan 2020 15:36:53 -0800

> We only need "static" information to be given for DSA flow dissection,
> so replace the expensive call to .flow_dissect() with an integer giving
> us the offset into the packet array of bytes that we must de-reference
> to obtain the protocol number. The overhead was alreayd available from
> the dsa_device_ops structure so use that directly.
> 
> The presence of a flow_dissect callback used to indicate that the DSA
> tagger supported returning that information,we now encode this with a
> proto_off value of DSA_PROTO_OFF_UNPSEC if the tagger does not support
> providing that information yet.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> Changes since RFC:
> 
> - use a constant instead of the "magic" -1
> - update all tag drivers and build test correctly

At the very least the typos need to be fixed, so marking this changes
requested in patchwork just FYI...