linux-kernel - Re: [PATCH AUTOSEL 5.19 34/73] net: mscc: ocelot: report FIFO drop counters through stats->rx

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Date:   Mon, 10 Oct 2022 11:58:15 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Sasha Levin <sashal@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.19 34/73] net: mscc: ocelot: report FIFO drop
 counters through stats->rx_dropped

On Sun, Oct 09, 2022 at 06:14:12PM -0400, Sasha Levin wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> [ Upstream commit cc160fc29a264726b2bfbc2f551081430db3df03 ]
> 
> if_link.h says:
> 
>  * @rx_dropped: Number of packets received but not processed,
>  *   e.g. due to lack of resources or unsupported protocol.
>  *   For hardware interfaces this counter may include packets discarded
>  *   due to L2 address filtering but should not include packets dropped
>  *   by the device due to buffer exhaustion which are counted separately in
>  *   @rx_missed_errors (since procfs folds those two counters together).
> 
> Currently we report "stats->rx_dropped = dev->stats.rx_dropped", the
> latter being incremented by various entities in the stack. This is not
> wrong, but we'd like to move ocelot_get_stats64() in the common ocelot
> switch lib which is independent of struct net_device.
> 
> To do that, report the hardware RX drop counters instead. These drops
> are due to policer action, or due to no destinations. When we have no
> memory in the queue system, report this through rx_missed_errors, as
> instructed.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---

Not needed for stable kernels, please drop, thanks.