net: dsa: netc: add VLAN filter table and egress treatment management

Implement the DSA .port_vlan_add and .port_vlan_del operations to enable
VLAN-aware bridge offloading on the NETC switch.

VLAN membership is maintained in the VLAN Filter Table (VFT). Adding the
first port to a VLAN creates a new VFT entry with hardware MAC learning
and flood-on-miss forwarding; subsequent ports update the existing
entry's membership bitmap. Removing the last port deletes the entry.

Egress tagging is handled through the Egress Treatment Table (ETT). Each
VLAN is allocated a group of ETT entries, one per available port. Ports
are assigned a sequential ett_offset during initialisation, used to
address each port's entry within the group. Untagged ports configure the
ETT to strip the outer VLAN tag; tagged ports pass frames through
unmodified. Each ETT group is optionally paired with an Egress Counter
Table (ECT) group for per-port frame counting, allocated on a best-effort
basis. When the egress rule of an ETT entry changes, the counter of the
corresponding ECT entry will be recounted to track the number of frames
that match the new egress rule.

A software shadow list serialised by vft_lock tracks active VLAN state
across both port membership and egress tagging. VID 0 is used for single
port mode and is ignored by both callbacks.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260611021458.2629145-8-wei.fang@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/fsl/ntmp.h b/include/linux/fsl/ntmp.h
index 4d329488763d..d3b6c476b91a 100644
--- a/include/linux/fsl/ntmp.h
+++ b/include/linux/fsl/ntmp.h
@@ -262,6 +262,21 @@ struct bpt_cfge_data {
 	__le32 fc_ports;
 };
 
+union ntmp_fmt_eid {
+	__le32 index;
+#define	FMTEID_INDEX		GENMASK(12, 0)
+	__le32 vuda_sqta;
+#define FMTEID_VUDA		GENMASK(1, 0)
+#define FMTEID_VUDA_DEL_OTAG	2
+#define FMTEID_SQTA		GENMASK(4, 2)
+#define FMTEID_SQTA_DEL		2
+#define FMTEID_VUDA_SQTA	BIT(13)
+	__le32 vara_vid;
+#define FMTEID_VID		GENMASK(11, 0)
+#define FMTEID_VARA		GENMASK(13, 12)
+#define FMTEID_VARA_VID		BIT(14)
+};
+
 #if IS_ENABLED(CONFIG_NXP_NETC_LIB)
 int ntmp_init_cbdr(struct netc_cbdr *cbdr, struct device *dev,
 		   const struct netc_cbdr_regs *regs);