mlxsw: Add 'ipv4_5' flex key

Currently virtual router ID element is broken to two sub-elements -
'VIRT_ROUTER_LSB' and 'VIRT_ROUTER_MSB'. It was broken as this field is
broken in 'ipv4_4' flex key which is used for IPv4 in Spectrum < 4.
For Spectrum-4, we use 'ipv4_4b' flex key which contains one field for
virtual router, this key is not supported in older ASICs.

Add 'ipv4_5' flex key which is supported in all ASICs and contains one
field for virtual router. Then there is no reason to use 'VIRT_ROUTER_LSB'
and 'VIRT_ROUTER_MSB', remove them and add one element 'VIRT_ROUTER' for
this field.

The motivation is to get rid of 'ipv4_4' flex key, as it might be chosen
for IPv6 multicast forwarding region. This will not allow the improvement
in a following patch. See more details in the cover letter and in a
following patch.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -32,8 +32,7 @@ static const struct mlxsw_afk_element_info mlxsw_afk_element_infos[] = {
 	MLXSW_AFK_ELEMENT_INFO_U32(IP_TTL_, 0x18, 0, 8),
 	MLXSW_AFK_ELEMENT_INFO_U32(IP_ECN, 0x18, 9, 2),
 	MLXSW_AFK_ELEMENT_INFO_U32(IP_DSCP, 0x18, 11, 6),
-	MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_MSB, 0x18, 17, 4),
-	MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_LSB, 0x18, 21, 8),
+	MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER, 0x18, 17, 12),
 	MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_96_127, 0x20, 4),
 	MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_64_95, 0x24, 4),
 	MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_32_63, 0x28, 4),

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

@@ -33,8 +33,7 @@ enum mlxsw_afk_element {
 	MLXSW_AFK_ELEMENT_IP_TTL_,
 	MLXSW_AFK_ELEMENT_IP_ECN,
 	MLXSW_AFK_ELEMENT_IP_DSCP,
-	MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
-	MLXSW_AFK_ELEMENT_VIRT_ROUTER_LSB,
+	MLXSW_AFK_ELEMENT_VIRT_ROUTER,
 	MLXSW_AFK_ELEMENT_FDB_MISS,
 	MLXSW_AFK_ELEMENT_L4_PORT_RANGE,
 	MLXSW_AFK_ELEMENT_MAX,

drivers/net/ethernet/mellanox/mlxsw/spectrum2_mr_tcam.c

@@ -45,8 +45,7 @@ static int mlxsw_sp2_mr_tcam_bind_group(struct mlxsw_sp *mlxsw_sp,
 }
 
 static const enum mlxsw_afk_element mlxsw_sp2_mr_tcam_usage_ipv4[] = {
-		MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
-		MLXSW_AFK_ELEMENT_VIRT_ROUTER_LSB,
+		MLXSW_AFK_ELEMENT_VIRT_ROUTER,
 		MLXSW_AFK_ELEMENT_SRC_IP_0_31,
 		MLXSW_AFK_ELEMENT_DST_IP_0_31,
 };
@@ -89,8 +88,7 @@ static void mlxsw_sp2_mr_tcam_ipv4_fini(struct mlxsw_sp2_mr_tcam *mr_tcam)
 }
 
 static const enum mlxsw_afk_element mlxsw_sp2_mr_tcam_usage_ipv6[] = {
-		MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
-		MLXSW_AFK_ELEMENT_VIRT_ROUTER_LSB,
+		MLXSW_AFK_ELEMENT_VIRT_ROUTER,
 		MLXSW_AFK_ELEMENT_SRC_IP_96_127,
 		MLXSW_AFK_ELEMENT_SRC_IP_64_95,
 		MLXSW_AFK_ELEMENT_SRC_IP_32_63,
@@ -189,11 +187,8 @@ mlxsw_sp2_mr_tcam_rule_parse(struct mlxsw_sp_acl_rule *rule,
 
 	rulei = mlxsw_sp_acl_rule_rulei(rule);
 	rulei->priority = priority;
-	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_VIRT_ROUTER_LSB,
-				       key->vrid, GENMASK(7, 0));
-	mlxsw_sp_acl_rulei_keymask_u32(rulei,
-				       MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
-				       key->vrid >> 8, GENMASK(3, 0));
+	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_VIRT_ROUTER,
+				       key->vrid, GENMASK(11, 0));
 	switch (key->proto) {
 	case MLXSW_SP_L3_PROTO_IPV4:
 		return mlxsw_sp2_mr_tcam_rule_parse4(rulei, key);

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

@@ -171,9 +171,8 @@ static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_2[] = {
 	MLXSW_AFK_ELEMENT_INST_U32(IP_PROTO, 0x04, 16, 8),
 };
 
-static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_4[] = {
-	MLXSW_AFK_ELEMENT_INST_U32(VIRT_ROUTER_LSB, 0x04, 24, 8),
-	MLXSW_AFK_ELEMENT_INST_EXT_U32(VIRT_ROUTER_MSB, 0x00, 0, 3, 0, true),
+static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_5[] = {
+	MLXSW_AFK_ELEMENT_INST_EXT_U32(VIRT_ROUTER, 0x04, 20, 11, 0, true),
 };
 
 static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv6_0[] = {
@@ -220,7 +219,7 @@ static const struct mlxsw_afk_block mlxsw_sp2_afk_blocks[] = {
 	MLXSW_AFK_BLOCK(0x38, mlxsw_sp_afk_element_info_ipv4_0),
 	MLXSW_AFK_BLOCK(0x39, mlxsw_sp_afk_element_info_ipv4_1),
 	MLXSW_AFK_BLOCK(0x3A, mlxsw_sp_afk_element_info_ipv4_2),
-	MLXSW_AFK_BLOCK(0x3C, mlxsw_sp_afk_element_info_ipv4_4),
+	MLXSW_AFK_BLOCK(0x3D, mlxsw_sp_afk_element_info_ipv4_5),
 	MLXSW_AFK_BLOCK(0x40, mlxsw_sp_afk_element_info_ipv6_0),
 	MLXSW_AFK_BLOCK(0x41, mlxsw_sp_afk_element_info_ipv6_1),
 	MLXSW_AFK_BLOCK(0x42, mlxsw_sp_afk_element_info_ipv6_2),
@@ -323,8 +322,7 @@ static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_mac_5b[] = {
 };
 
 static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv4_4b[] = {
-	MLXSW_AFK_ELEMENT_INST_U32(VIRT_ROUTER_LSB, 0x04, 13, 8),
-	MLXSW_AFK_ELEMENT_INST_U32(VIRT_ROUTER_MSB, 0x04, 21, 4),
+	MLXSW_AFK_ELEMENT_INST_U32(VIRT_ROUTER, 0x04, 13, 12),
 };
 
 static struct mlxsw_afk_element_inst mlxsw_sp_afk_element_info_ipv6_2b[] = {