netdev - Re: [RFC net-next v3 2/2] net/mlx5e: Add per queue netdev-genl stats

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Date: Mon, 3 Jun 2024 14:50:16 -0700
From: Joe Damato <jdamato@...tly.com>
To: Tariq Toukan <ttoukan.linux@...il.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	nalramli@...tly.com, Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	"open list:MELLANOX MLX5 core VPI driver" <linux-rdma@...r.kernel.org>,
	Tariq Toukan <tariqt@...dia.com>
Subject: Re: [RFC net-next v3 2/2] net/mlx5e: Add per queue netdev-genl stats

On Tue, Jun 04, 2024 at 12:36:16AM +0300, Tariq Toukan wrote:
> 
> 
> On 03/06/2024 22:22, Joe Damato wrote:
> > On Mon, Jun 03, 2024 at 02:11:14PM +0300, Tariq Toukan wrote:
> > > 
> 
> ...
> 
> > > 
> > > I still don't really like this design, so I gave some more thought on
> > > this...
> > > 
> > > I think we should come up with a new mapping array under priv, that maps i
> > > (from real_num_tx_queues) to the matching sq_stats struct.
> > > This array would be maintained in the channels open/close functions,
> > > similarly to priv->txq2sq.
> > > 
> > > Then, we would not calculate the mapping per call, but just get the proper
> > > pointer from the array. This eases the handling of htb and ptp queues, which
> > > were missed in your txq_ix_to_chtc_ix().
> > 
> > Maybe I am just getting way off track here, but I noticed this in
> > drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c in
> > set_pflag_tx_port_ts:
> > 
> >    if (!err)
> >      priv->tx_ptp_opened = true;
> > 
> > but what if enable is false, meaning the user is disabling ptp via
> > ethtool?
> > 
> 
> This bool field under priv acts as a flag, means: ptp was ever opened.
> It's the same idea as max_opened_tc, but with boolean instead of numeric.

OK, but then to avoid double counting ptp, I suppose we don't
output ptp stats in base and only when the correct txq_ix is passed
in to the tx stats function which refers to the PTP queue?

It's either that or we dont include ptp's sqstats in the
txq2sq_stats mapping you've proposed, if I understand correctly.