mlxsw: spectrum_acl: Implement priority setting for rules inserted to TCAM

For Spectrum-2, we need to insert priority to C-TCAM because HW
needs that info in order to correctly process scenarios where rules
are in both C-TCAM and A-TCAM.

So extend the mlxsw_sp_acl_ctcam_entry_add() args to accept indication
if priority needs to be filled up and implement the priority
computation and fill-up.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum1_acl_tcam.c

@@ -91,7 +91,8 @@ mlxsw_sp1_acl_ctcam_region_catchall_add(struct mlxsw_sp *mlxsw_sp,
 		goto err_rulei_commit;
 	err = mlxsw_sp_acl_ctcam_entry_add(mlxsw_sp, &region->cregion,
 					   &region->catchall.cchunk,
-					   &region->catchall.centry, rulei);
+					   &region->catchall.centry,
+					   rulei, false);
 	if (err)
 		goto err_entry_add;
 	region->catchall.rulei = rulei;
@@ -178,7 +179,7 @@ static int mlxsw_sp1_acl_tcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 
 	return mlxsw_sp_acl_ctcam_entry_add(mlxsw_sp, &region->cregion,
 					    &chunk->cchunk, &entry->centry,
-					    rulei);
+					    rulei, false);
 }
 
 static void mlxsw_sp1_acl_tcam_entry_del(struct mlxsw_sp *mlxsw_sp,

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_ctcam.c

@@ -71,16 +71,24 @@ static int
 mlxsw_sp_acl_ctcam_region_entry_insert(struct mlxsw_sp *mlxsw_sp,
 				       struct mlxsw_sp_acl_tcam_region *region,
 				       unsigned int offset,
-				       struct mlxsw_sp_acl_rule_info *rulei)
+				       struct mlxsw_sp_acl_rule_info *rulei,
+				       bool fillup_priority)
 {
 	struct mlxsw_afk *afk = mlxsw_sp_acl_afk(mlxsw_sp->acl);
 	char ptce2_pl[MLXSW_REG_PTCE2_LEN];
 	char *act_set;
+	u32 priority;
 	char *mask;
 	char *key;
+	int err;
+
+	err = mlxsw_sp_acl_tcam_priority_get(mlxsw_sp, rulei, &priority,
+					     fillup_priority);
+	if (err)
+		return err;
 
 	mlxsw_reg_ptce2_pack(ptce2_pl, true, MLXSW_REG_PTCE2_OP_WRITE_WRITE,
-			     region->tcam_region_info, offset, 0);
+			     region->tcam_region_info, offset, priority);
 	key = mlxsw_reg_ptce2_flex_key_blocks_data(ptce2_pl);
 	mask = mlxsw_reg_ptce2_mask_data(ptce2_pl);
 	mlxsw_afk_encode(afk, region->key_info, &rulei->values, key, mask);
@@ -172,7 +180,8 @@ int mlxsw_sp_acl_ctcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 				 struct mlxsw_sp_acl_ctcam_region *cregion,
 				 struct mlxsw_sp_acl_ctcam_chunk *cchunk,
 				 struct mlxsw_sp_acl_ctcam_entry *centry,
-				 struct mlxsw_sp_acl_rule_info *rulei)
+				 struct mlxsw_sp_acl_rule_info *rulei,
+				 bool fillup_priority)
 {
 	int err;
 
@@ -183,7 +192,7 @@ int mlxsw_sp_acl_ctcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 
 	err = mlxsw_sp_acl_ctcam_region_entry_insert(mlxsw_sp, cregion->region,
 						     centry->parman_item.index,
-						     rulei);
+						     rulei, fillup_priority);
 	if (err)
 		goto err_rule_insert;
 	return 0;

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c

@@ -112,6 +112,29 @@ void mlxsw_sp_acl_tcam_fini(struct mlxsw_sp *mlxsw_sp,
 	kfree(tcam->used_regions);
 }
 
+int mlxsw_sp_acl_tcam_priority_get(struct mlxsw_sp *mlxsw_sp,
+				   struct mlxsw_sp_acl_rule_info *rulei,
+				   u32 *priority, bool fillup_priority)
+{
+	u64 max_priority;
+
+	if (!fillup_priority) {
+		*priority = 0;
+		return 0;
+	}
+
+	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, KVD_SIZE))
+		return -EIO;
+
+	max_priority = MLXSW_CORE_RES_GET(mlxsw_sp->core, KVD_SIZE);
+	if (rulei->priority > max_priority)
+		return -EINVAL;
+
+	/* Unlike in TC, in HW, higher number means higher priority. */
+	*priority = max_priority - rulei->priority;
+	return 0;
+}
+
 static int mlxsw_sp_acl_tcam_region_id_get(struct mlxsw_sp_acl_tcam *tcam,
 					   u16 *p_id)
 {

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h

@@ -57,6 +57,9 @@ int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
 			   struct mlxsw_sp_acl_tcam *tcam);
 void mlxsw_sp_acl_tcam_fini(struct mlxsw_sp *mlxsw_sp,
 			    struct mlxsw_sp_acl_tcam *tcam);
+int mlxsw_sp_acl_tcam_priority_get(struct mlxsw_sp *mlxsw_sp,
+				   struct mlxsw_sp_acl_rule_info *rulei,
+				   u32 *priority, bool fillup_priority);
 
 struct mlxsw_sp_acl_profile_ops {
 	size_t ruleset_priv_size;
@@ -128,7 +131,8 @@ int mlxsw_sp_acl_ctcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 				 struct mlxsw_sp_acl_ctcam_region *cregion,
 				 struct mlxsw_sp_acl_ctcam_chunk *cchunk,
 				 struct mlxsw_sp_acl_ctcam_entry *centry,
-				 struct mlxsw_sp_acl_rule_info *rulei);
+				 struct mlxsw_sp_acl_rule_info *rulei,
+				 bool fillup_priority);
 void mlxsw_sp_acl_ctcam_entry_del(struct mlxsw_sp *mlxsw_sp,
 				  struct mlxsw_sp_acl_ctcam_region *cregion,
 				  struct mlxsw_sp_acl_ctcam_chunk *cchunk,