netdev - Re: [net-next 4/8] net/mlx5e: Add device out of buffer counter

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Message-ID: <20190826133949.0691660c@cakuba.netronome.com>
Date:   Mon, 26 Aug 2019 13:39:49 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Moshe Shemesh <moshe@...lanox.com>
Subject: Re: [net-next 4/8] net/mlx5e: Add device out of buffer counter

On Mon, 26 Aug 2019 20:14:47 +0000, Saeed Mahameed wrote:
> > I see thanks for the explanation and sorry for the delayed response.
> > Would it perhaps make sense to indicate the hairpin in the name?  
> 
> We had some internal discussion and we couldn't come up with the
> perfect name :)
> 
> hairpin is just an implementation detail, we don't want to exclusively
> bind this counter to hairpin only flows, the problem is not with
> hairpin, the actual problem is due to the use of internal RQs, for now
> it only happens with "hairpin like" flows, but tomorrow it can happen
> with a different scenario but same root cause (the use of internal
> RQs), we want to have one counter to count internal drops due to
> internal use of internal RQs.
> 
> so how about:
> dev_internal_rq_oob: Device Internal RQ out of buffer
> dev_internal_out_of_res: Device Internal out of resources (more generic
> ? too generic ?)

Maybe dev_internal_queue_oob? The use of 'internal' is a little
unfortunate, because it may be read as RQ run out of internal buffers.
Rather than special type of queue run out of buffers.
But not knowing the HW I don't really have any great suggestions :(
Either of the above would work as well.

> Any suggestion that you provide will be more than welcome.
> 
> > dev_out_of_buffer is quite a generic name, and there seems to be no
> > doc, nor does the commit message explains it as well as you have..  
> 
> Regarding documentation:
> All mlx5 ethool counters are documented here
> https://community.mellanox.com/s/article/understanding-mlx5-linux-counters-and-status-parameters
> 
> once we decide on the name, will add the new counter to the doc.

I see, thanks!