ice: improve TCAM priority handling for RSS profiles

Enhance TCAM priority logic to avoid conflicts between RSS profiles
with overlapping PTGs and attributes.

Track used PTG and attribute combinations.
Ensure higher-priority profiles override lower ones.
Add helper for setting TCAM flags and masks.

Ensure RSS rule consistency and prevent unintended matches.

Co-developed-by: Dan Nowlin <[email protected]>
Signed-off-by: Dan Nowlin <[email protected]>
Signed-off-by: Przemek Kitszel <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Aleksandr Loktionov <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: aloktion

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

@@ -3577,6 +3577,19 @@ ice_move_vsi(struct ice_hw *hw, enum ice_block blk, u16 vsi, u16 vsig,
 	return 0;
 }
 
+/**
+ * ice_set_tcam_flags - set TCAM flag don't care mask
+ * @mask: mask for flags
+ * @dc_mask: pointer to the don't care mask
+ */
+static void ice_set_tcam_flags(u16 mask, u8 dc_mask[ICE_TCAM_KEY_VAL_SZ])
+{
+	u16 inverted_mask = ~mask;
+
+	/* flags are lowest u16 */
+	put_unaligned_le16(inverted_mask, dc_mask);
+}
+
 /**
  * ice_rem_chg_tcam_ent - remove a specific TCAM entry from change list
  * @hw: pointer to the HW struct
@@ -3647,6 +3660,9 @@ ice_prof_tcam_ena_dis(struct ice_hw *hw, enum ice_block blk, bool enable,
 	if (!p)
 		return -ENOMEM;
 
+	/* set don't care masks for TCAM flags */
+	ice_set_tcam_flags(tcam->attr.mask, dc_msk);
+
 	status = ice_tcam_write_entry(hw, blk, tcam->tcam_idx, tcam->prof_id,
 				      tcam->ptg, vsig, 0, tcam->attr.flags,
 				      vl_msk, dc_msk, nm_msk);
@@ -3672,6 +3688,34 @@ ice_prof_tcam_ena_dis(struct ice_hw *hw, enum ice_block blk, bool enable,
 	return status;
 }
 
+/**
+ * ice_ptg_attr_in_use - determine if PTG and attribute pair is in use
+ * @ptg_attr: pointer to the PTG and attribute pair to check
+ * @ptgs_used: bitmap that denotes which PTGs are in use
+ * @attr_used: array of PTG and attributes pairs already used
+ * @attr_cnt: count of entries in the attr_used array
+ *
+ * Return: true if the PTG and attribute pair is in use, false otherwise.
+ */
+static bool
+ice_ptg_attr_in_use(struct ice_tcam_inf *ptg_attr, unsigned long *ptgs_used,
+		    struct ice_tcam_inf *attr_used[], u16 attr_cnt)
+{
+	u16 i;
+
+	if (!test_bit(ptg_attr->ptg, ptgs_used))
+		return false;
+
+	/* the PTG is used, so now look for correct attributes */
+	for (i = 0; i < attr_cnt; i++)
+		if (attr_used[i]->ptg == ptg_attr->ptg &&
+		    attr_used[i]->attr.flags == ptg_attr->attr.flags &&
+		    attr_used[i]->attr.mask == ptg_attr->attr.mask)
+			return true;
+
+	return false;
+}
+
 /**
  * ice_adj_prof_priorities - adjust profile based on priorities
  * @hw: pointer to the HW struct
@@ -3684,10 +3728,16 @@ ice_adj_prof_priorities(struct ice_hw *hw, enum ice_block blk, u16 vsig,
 			struct list_head *chg)
 {
 	DECLARE_BITMAP(ptgs_used, ICE_XLT1_CNT);
+	struct ice_tcam_inf **attr_used;
 	struct ice_vsig_prof *t;
-	int status;
+	u16 attr_used_cnt = 0;
+	int status = 0;
 	u16 idx;
 
+	attr_used = kcalloc(ICE_MAX_PTG_ATTRS, sizeof(*attr_used), GFP_KERNEL);
+	if (!attr_used)
+		return -ENOMEM;
+
 	bitmap_zero(ptgs_used, ICE_XLT1_CNT);
 	idx = vsig & ICE_VSIG_IDX_M;
 
@@ -3705,11 +3755,15 @@ ice_adj_prof_priorities(struct ice_hw *hw, enum ice_block blk, u16 vsig,
 		u16 i;
 
 		for (i = 0; i < t->tcam_count; i++) {
+			bool used;
+
 			/* Scan the priorities from newest to oldest.
 			 * Make sure that the newest profiles take priority.
 			 */
-			if (test_bit(t->tcam[i].ptg, ptgs_used) &&
-			    t->tcam[i].in_use) {
+			used = ice_ptg_attr_in_use(&t->tcam[i], ptgs_used,
+						   attr_used, attr_used_cnt);
+
+			if (used && t->tcam[i].in_use) {
 				/* need to mark this PTG as never match, as it
 				 * was already in use and therefore duplicate
 				 * (and lower priority)
@@ -3719,9 +3773,8 @@ ice_adj_prof_priorities(struct ice_hw *hw, enum ice_block blk, u16 vsig,
 							       &t->tcam[i],
 							       chg);
 				if (status)
-					return status;
-			} else if (!test_bit(t->tcam[i].ptg, ptgs_used) &&
-				   !t->tcam[i].in_use) {
+					goto free_attr_used;
+			} else if (!used && !t->tcam[i].in_use) {
 				/* need to enable this PTG, as it in not in use
 				 * and not enabled (highest priority)
 				 */
@@ -3730,15 +3783,21 @@ ice_adj_prof_priorities(struct ice_hw *hw, enum ice_block blk, u16 vsig,
 							       &t->tcam[i],
 							       chg);
 				if (status)
-					return status;
+					goto free_attr_used;
 			}
 
 			/* keep track of used ptgs */
-			__set_bit(t->tcam[i].ptg, ptgs_used);
+			set_bit(t->tcam[i].ptg, ptgs_used);
+			if (attr_used_cnt < ICE_MAX_PTG_ATTRS)
+				attr_used[attr_used_cnt++] = &t->tcam[i];
+			else
+				ice_debug(hw, ICE_DBG_INIT, "Warn: ICE_MAX_PTG_ATTRS exceeded\n");
 		}
 	}
 
-	return 0;
+free_attr_used:
+	kfree(attr_used);
+	return status;
 }
 
 /**
@@ -3821,11 +3880,15 @@ ice_add_prof_id_vsig(struct ice_hw *hw, enum ice_block blk, u16 vsig, u64 hdl,
 		p->vsig = vsig;
 		p->tcam_idx = t->tcam[i].tcam_idx;
 
+		/* set don't care masks for TCAM flags */
+		ice_set_tcam_flags(t->tcam[i].attr.mask, dc_msk);
+
 		/* write the TCAM entry */
 		status = ice_tcam_write_entry(hw, blk, t->tcam[i].tcam_idx,
 					      t->tcam[i].prof_id,
-					      t->tcam[i].ptg, vsig, 0, 0,
-					      vl_msk, dc_msk, nm_msk);
+					      t->tcam[i].ptg, vsig, 0,
+					      t->tcam[i].attr.flags, vl_msk,
+					      dc_msk, nm_msk);
 		if (status) {
 			devm_kfree(ice_hw_to_dev(hw), p);
 			goto err_ice_add_prof_id_vsig;
@@ -4139,9 +4202,6 @@ ice_flow_assoc_fdir_prof(struct ice_hw *hw, enum ice_block blk,
 	u16 vsi_num;
 	int status;
 
-	if (blk != ICE_BLK_FD)
-		return -EINVAL;
-
 	vsi_num = ice_get_hw_vsi_num(hw, dest_vsi);
 	status = ice_add_prof_id_flow(hw, blk, vsi_num, hdl);
 	if (status) {
@@ -4150,6 +4210,9 @@ ice_flow_assoc_fdir_prof(struct ice_hw *hw, enum ice_block blk,
 		return status;
 	}
 
+	if (blk != ICE_BLK_FD)
+		return 0;
+
 	vsi_num = ice_get_hw_vsi_num(hw, fdir_vsi);
 	status = ice_add_prof_id_flow(hw, blk, vsi_num, hdl);
 	if (status) {

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

@@ -187,6 +187,7 @@ struct ice_prof_map {
 };
 
 #define ICE_INVALID_TCAM	0xFFFF
+#define ICE_MAX_PTG_ATTRS	1024
 
 struct ice_tcam_inf {
 	u16 tcam_idx;