ice: Add switch recipe reusing feature

New E810 firmware supports the corresponding functionality, so the driver
allows PFs to subscribe the same switch recipes. Then when the PF is done
with a switch recipes, the PF can ask firmware to free that switch recipe.

When users configure a rule to PFn into E810 switch component, if there is
no existing recipe matching this rule's pattern, the driver will request
firmware to allocate and return a new recipe resource for the rule by
calling ice_add_sw_recipe() and ice_alloc_recipe(). If there is an existing
recipe matching this rule's pattern with different key value, or this is a
same second rule to PFm into switch component, the driver checks out this
recipe by calling ice_find_recp(), the driver will tell firmware to share
using this same recipe resource by calling ice_subscribable_recp_shared()
and ice_subscribe_recipe().

When firmware detects that all subscribing PFs have freed the switch
recipe, firmware will free the switch recipe so that it can be reused.

This feature also fixes a problem where all switch recipes would eventually
be exhausted because switch recipes could not be freed, as freeing a shared
recipe could potentially break other PFs that were using it.
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Andrii Staikov <andrii.staikov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Steven Zou <steven.zou@intel.com>
Tested-by: Mayank Sharma <mayank.sharma@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_adminq_cmd.h

@@ -264,6 +264,8 @@ struct ice_aqc_set_port_params {
 #define ICE_AQC_RES_TYPE_FLAG_SHARED			BIT(7)
 #define ICE_AQC_RES_TYPE_FLAG_SCAN_BOTTOM		BIT(12)
 #define ICE_AQC_RES_TYPE_FLAG_IGNORE_INDEX		BIT(13)
+#define ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_SHARED		BIT(14)
+#define ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_CTL		BIT(15)
 
 #define ICE_AQC_RES_TYPE_FLAG_DEDICATED			0x00
 

drivers/net/ethernet/intel/ice/ice_common.c

@@ -1142,6 +1142,8 @@ int ice_init_hw(struct ice_hw *hw)
 	if (status)
 		goto err_unroll_fltr_mgmt_struct;
 	mutex_init(&hw->tnl_lock);
+	ice_init_chk_recipe_reuse_support(hw);
+
 	return 0;
 
 err_unroll_fltr_mgmt_struct:

drivers/net/ethernet/intel/ice/ice_switch.h

@@ -432,5 +432,6 @@ ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 *r_assoc,
 int
 ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 r_assoc,
 			     struct ice_sq_cd *cd);
+void ice_init_chk_recipe_reuse_support(struct ice_hw *hw);
 
 #endif /* _ICE_SWITCH_H_ */

drivers/net/ethernet/intel/ice/ice_type.h

@@ -848,6 +848,8 @@ struct ice_hw {
 
 	u16 max_burst_size;	/* driver sets this value */
 
+	u8 recp_reuse:1;	/* indicates whether FW supports recipe reuse */
+
 	/* Tx Scheduler values */
 	u8 num_tx_sched_layers;
 	u8 num_tx_sched_phys_layers;