netdev - Re: [PATCH net-next 5/8] net/mlx5e: Expose the VF/SF RX drop counter on the representor

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Date: Sun, 31 Mar 2024 21:52:06 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, Simon Horman <horms@...nel.org>
Cc: Tariq Toukan <tariqt@...dia.com>, "David S. Miller"
 <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
 Saeed Mahameed <saeedm@...dia.com>, Gal Pressman <gal@...dia.com>,
 Leon Romanovsky <leonro@...dia.com>, Carolina Jubran <cjubran@...dia.com>,
 Aya Levin <ayal@...dia.com>
Subject: Re: [PATCH net-next 5/8] net/mlx5e: Expose the VF/SF RX drop counter
 on the representor

On 28/03/2024 18:21, Jakub Kicinski wrote:
> On Thu, 28 Mar 2024 11:18:31 +0000 Simon Horman wrote:
>>> The "rx_vport_out_of_buffer" equals the sum of all
>>> Q counters out_of_buffer values allocated on the VF/SF.
>>
>> Hi Carolina and Tariq,
>>
>> I am wondering if any consideration was given to making this
>> a generic counter. Buffer exhaustion sounds like something that
>> other NICs may report too.
> 
> I think it's basically rx_missed_errors from rtnl_link_stats64.
> mlx5 doesn't currently report it at all, AFAICT.
> 

We expose it in ethtool stats.
Note that the "local" RX buffer exhaustion counter exists for a long time.

Here we introduce in the representor kind of a "remote" version of the 
counter, to help providers monitor RX drops that occur in the customers' 
side.

It follows the local counter hence currently it is not generic.