netdev - Re: [Intel-wired-lan] [PATCH iwl-next v2] i40e: Clear stats after deleting tc

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Message-ID: <3187ca51-d1cf-d175-5740-341ab9bc46d4@intel.com>
Date: Fri, 28 Jul 2023 16:58:32 -0700
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
To: Jedrzej Jagielski <jedrzej.jagielski@...el.com>,
	<intel-wired-lan@...ts.osuosl.org>
CC: Grzegorz Szczurek <grzegorzx.szczurek@...el.com>,
	<netdev@...r.kernel.org>, <anthony.l.nguyen@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v2] i40e: Clear stats after
 deleting tc

On 7/27/2023 1:43 AM, Jedrzej Jagielski wrote:
> From: Grzegorz Szczurek <grzegorzx.szczurek@...el.com>
> 
> There was an issue with ethtool stats that
> have not been cleared after tc had been deleted.
> Stats printed by ethtool -S remained the same despite
> qdick had been removed, what is an unexpected behavior.

qdisc

> Stats should be reseted once qdick is removed.

please reflow to 75 chars, please restate also as
Stats should be reset once the qdisc is removed.

> 
> Fix this by resetting stats after deleting tc
> by calling i40e_vsi_reset_stats() function after
> distroying qdisc.

destroying

> 
> Steps to reproduce:
> 
> 1) Add ingress rule
> tc qdisc add dev <ethX> ingress
> 
> 2) Create qdisc and filter
> tc qdisc add dev <ethX> root mqprio num_tc 4 map 0 0 0 0 1 2 2 3 queues 2@0 2@2 1@4 1@5 hw 1 mode channel
> tc filter add dev <ethX> protocol ip parent ffff: prio 3 flower dst_ip <ip> ip_proto tcp dst_port 8300 skip_sw hw_tc 2
> 
> 3) Run iperf between client and SUT
> iperf3 -s -p 8300
> iperf3 -c <ip> -p 8300
> 
> 4) Check the ethtool stats
> ethtool -S <ethX> | grep packets | column
> 
> 5) Delete filter and qdisc
> tc filter del dev <ethX> parent ffff:
> tc qdisc del dev <ethX> root
> 
> 6) Check the ethtool stats and see that they didn't change
> ethtool -S <ethX> | grep packets | column
> 
> Signed-off-by: Grzegorz Szczurek <grzegorzx.szczurek@...el.com>
> Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
> ---
> v2: Make the commit msg more detailed
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 29ad1797adce..e8e03ede1672 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -5885,6 +5885,11 @@ static int i40e_vsi_config_tc(struct i40e_vsi *vsi, u8 enabled_tc)
>  
>  	/* Update the netdev TC setup */
>  	i40e_vsi_config_netdev_tc(vsi, enabled_tc);
> +
> +	/* After destroying qdisc reset all stats of the vsi */
> +	if (!vsi->mqprio_qopt.qopt.hw)
> +		i40e_vsi_reset_stats(vsi);
> +
>  out:
>  	return ret;
>  }