> -----Original Message-----
> From: Intel-wired-lan <[email protected]> On Behalf Of
> Marcin Szycik
> Sent: Thursday, June 27, 2024 8:26 PM
> To: [email protected]
> Cc: [email protected]; [email protected]; Lobakin, Aleksander
> <[email protected]>; Marcin Szycik
> <[email protected]>; Kitszel, Przemyslaw
> <[email protected]>; [email protected]
> Subject: [Intel-wired-lan] [PATCH iwl-next v3 7/7] ice: Add tracepoint for
> adding and removing switch rules
>
> 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.
>
> Example configuration:
> cd /sys/kernel/tracing
> echo function > current_tracer
> echo ice_aq_sw_rules > set_ftrace_filter
> echo ice_aq_sw_rules > set_event
> echo 1 > tracing_on
> cat trace
>
> Example output:
> tc-4097 [069] ...1. 787.595536: ice_aq_sw_rules <-ice_rem_adv_rule
> tc-4097 [069] ..... 787.595705: ice_aq_sw_rules: rules=9 recipes=15
> tc-4098 [057] ...1. 787.652033: ice_aq_sw_rules <-ice_add_adv_rule
> tc-4098 [057] ..... 787.652201: ice_aq_sw_rules: rules=10 recipes=16
>
> Reviewed-by: Michal Swiatkowski <[email protected]>
> Reviewed-by: Przemek Kitszel <[email protected]>
> Signed-off-by: Marcin Szycik <[email protected]>
>
> ---
> v3: Added example configuration and output
> ---
> 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(-)
>
Tested-by: Sujai Buvaneswaran <[email protected]>
