netdev - Re: [PATCH iwl-next v2 7/7] ice: Add tracepoint for adding and removing switch rules

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Date: Tue, 25 Jun 2024 09:51:19 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Marcin Szycik <marcin.szycik@...ux.intel.com>
CC: <netdev@...r.kernel.org>, <michal.swiatkowski@...ux.intel.com>,
	<aleksander.lobakin@...el.com>, <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH iwl-next v2 7/7] ice: Add tracepoint for adding and
 removing switch rules

On 6/24/24 16:45, Marcin Szycik wrote:
> Track the number of rules and recipes added to switch. Add a tracepoint to
> ice_aq_sw_rules(), which shows both rule and recipe count. This information
> can be helpful when designing a set of rules to program to the hardware, as
> it shows where the practical limit is. Actual limits are known (64 recipes,
> 32k rules), but it's hard to translate these values to how many rules the
> *user* can actually create, because of extra metadata being implicitly
> added, and recipe/rule chaining. Chaining combines several recipes/rules to
> create a larger recipe/rule, so one large rule added by the user might
> actually consume multiple rules from hardware perspective.
> 
> Rule counter is simply incremented/decremented in ice_aq_sw_rules(), since
> all rules are added or removed via it.
> 
> Counting recipes is harder, as recipes can't be removed (only overwritten).
> Recipes added via ice_aq_add_recipe() could end up being unused, when
> there is an error in later stages of rule creation. Instead, track the
> allocation and freeing of recipes, which should reflect the actual usage of
> recipes (if something fails after recipe(s) were created, caller should
> free them). Also, a number of recipes are loaded from NVM by default -
> initialize the recipe counter with the number of these recipes on switch
> initialization.
> 
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
> Signed-off-by: Marcin Szycik <marcin.szycik@...ux.intel.com>
> ---
>   drivers/net/ethernet/intel/ice/ice_common.c |  3 +++
>   drivers/net/ethernet/intel/ice/ice_switch.c | 22 +++++++++++++++++++--
>   drivers/net/ethernet/intel/ice/ice_trace.h  | 18 +++++++++++++++++
>   drivers/net/ethernet/intel/ice/ice_type.h   |  2 ++
>   4 files changed, 43 insertions(+), 2 deletions(-)
> 

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>