linux-kernel - Re: [PATCH net-next 4/4] net: dsa: felix: drop oversized frames with tc-taprio instead of hanging the port

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Date:   Mon, 27 Jun 2022 11:46:44 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Walle <michael@...le.cc>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Colin Foster <colin.foster@...advantage.com>,
        Richie Pearn <richard.pearn@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/4] net: dsa: felix: drop oversized frames
 with tc-taprio instead of hanging the port

On Sun, 26 Jun 2022 15:05:05 +0300 Vladimir Oltean wrote:
> When a frame is dropped due to a queue system oversize condition, the
> counter that increments is the generic "drop_tail" in ethtool -S, even
> if this isn't a tail drop as the rest (i.e. the controlling watermarks
> don't count these frames, as can be seen in "devlink sb occupancy show
> pci/0000:00:00.5 sb 0"). So the hardware counter is unspecific
> regarding the drop reason.

I had mixed feelings about the stats, as I usually do, but I don't
recall if I sent that email. Are you at least counting the drop_tail
into one of the standard tx error / drop stats so admins will notice?