[PATCH iwl-next 4/8] ice: allow overriding lan_en, lb_en in switch

[Jakub Slepecki <jakub.slepecki@intel.com>]

Currently, lan_en and lb_en are determined based on switching mode,
destination MAC, and the lookup type, action type and flags of the rule
in question.  This gives little to no options for the user (such as
ice_fltr.c) to enforce rules to behave in a specific way.

Such functionality is needed to work with pairs of rules, for example,
when handling MAC forward to LAN together with MAC,VLAN forward to
loopback rules pair.  This case could not be easily deduced in a context
of a single filter without adding a specialized flag.

Instead of adding a specialized flag to mark special scenario rules,
we add a slightly more generic flag to the lan_en and lb_en themselves
for the ice_fltr.c to request specific destination flags later on, for
example, to override value:

    struct ice_fltr_info fi;
    fi.lb_en = ICE_FLTR_INFO_LB_LAN_FORCE_ENABLED;
    fi.lan_en = ICE_FLTR_INFO_LB_LAN_FORCE_DISABLED;

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: Jakub Slepecki <jakub.slepecki@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_switch.c | 21 +++++++++++++--------
 drivers/net/ethernet/intel/ice/ice_switch.h |  7 +++++++
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index 04e5d653efce..7b63588948fd 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -2538,8 +2538,9 @@ int ice_get_initial_sw_cfg(struct ice_hw *hw)
  */
 static void ice_fill_sw_info(struct ice_hw *hw, struct ice_fltr_info *fi)
 {
-	fi->lb_en = false;
-	fi->lan_en = false;
+	bool lan_en = false;
+	bool lb_en = false;
+
 	if ((fi->flag & ICE_FLTR_TX) &&
 	    (fi->fltr_act == ICE_FWD_TO_VSI ||
 	     fi->fltr_act == ICE_FWD_TO_VSI_LIST ||
@@ -2549,7 +2550,7 @@ static void ice_fill_sw_info(struct ice_hw *hw, struct ice_fltr_info *fi)
 		 * packets to the internal switch that will be dropped.
 		 */
 		if (fi->lkup_type != ICE_SW_LKUP_VLAN)
-			fi->lb_en = true;
+			lb_en = true;
 
 		/* Set lan_en to TRUE if
 		 * 1. The switch is a VEB AND
@@ -2578,14 +2579,18 @@ static void ice_fill_sw_info(struct ice_hw *hw, struct ice_fltr_info *fi)
 			     !is_unicast_ether_addr(fi->l_data.mac.mac_addr)) ||
 			    (fi->lkup_type == ICE_SW_LKUP_MAC_VLAN &&
 			     !is_unicast_ether_addr(fi->l_data.mac.mac_addr)))
-				fi->lan_en = true;
+				lan_en = true;
 		} else {
-			fi->lan_en = true;
+			lan_en = true;
 		}
 	}
 
 	if (fi->flag & ICE_FLTR_TX_ONLY)
-		fi->lan_en = false;
+		lan_en = false;
+	if (!(fi->lb_en & ICE_FLTR_INFO_LB_LAN_FORCE_MASK))
+		fi->lb_en = lb_en;
+	if (!(fi->lan_en & ICE_FLTR_INFO_LB_LAN_FORCE_MASK))
+		fi->lan_en = lan_en;
 }
 
 /**
@@ -2669,9 +2674,9 @@ ice_fill_sw_rule(struct ice_hw *hw, struct ice_fltr_info *f_info,
 		return;
 	}
 
-	if (f_info->lb_en)
+	if (f_info->lb_en & ICE_FLTR_INFO_LB_LAN_VALUE_MASK)
 		act |= ICE_SINGLE_ACT_LB_ENABLE;
-	if (f_info->lan_en)
+	if (f_info->lan_en & ICE_FLTR_INFO_LB_LAN_VALUE_MASK)
 		act |= ICE_SINGLE_ACT_LAN_ENABLE;
 
 	switch (f_info->lkup_type) {
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.h b/drivers/net/ethernet/intel/ice/ice_switch.h
index 671d7a5f359f..a7dc4bfec3a0 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.h
+++ b/drivers/net/ethernet/intel/ice/ice_switch.h
@@ -72,6 +72,13 @@ enum ice_src_id {
 	ICE_SRC_ID_LPORT,
 };
 
+#define ICE_FLTR_INFO_LB_LAN_VALUE_MASK BIT(0)
+#define ICE_FLTR_INFO_LB_LAN_FORCE_MASK BIT(1)
+#define ICE_FLTR_INFO_LB_LAN_FORCE_ENABLED	\
+	(ICE_FLTR_INFO_LB_LAN_VALUE_MASK |	\
+	 ICE_FLTR_INFO_LB_LAN_FORCE_MASK)
+#define ICE_FLTR_INFO_LB_LAN_FORCE_DISABLED ICE_FLTR_INFO_LB_LAN_FORCE_MASK
+
 struct ice_fltr_info {
 	/* Look up information: how to look up packet */
 	enum ice_sw_lkup_type lkup_type;
-- 
2.43.0