Commit c6230446 authored Nov 03, 2025 by Daniel Golle Committed by Jakub Kicinski Nov 06, 2025

net: dsa: add tagging driver for MaxLinear GSW1xx switch family



Add support for a new DSA tagging protocol driver for the MaxLinear
GSW1xx switch family. The GSW1xx switches use a proprietary 8-byte
special tag inserted between the source MAC address and the EtherType
field to indicate the source and destination ports for frames
traversing the CPU port.

Implement the tag handling logic to insert the special tag on transmit
and parse it on receive.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://patch.msgid.link/0e973ebfd9433c30c96f50670da9e9449a0d98f2.1762170107.git.daniel@makrotopia.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent e1bb4b36

MAINTAINERS

+2 −1

Original line number	Diff line number	Diff line
		@@ -14053,7 +14053,7 @@ F: tools/testing/selftests/landlock/
		K: landlock
		K: LANDLOCK

		LANTIQ / INTEL Ethernet drivers
		LANTIQ / MAXLINEAR / INTEL Ethernet DSA drivers
		M: Hauke Mehrtens <hauke@hauke-m.de>
		L: netdev@vger.kernel.org
		S: Maintained
		@@ -14061,6 +14061,7 @@ F: Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
		F: drivers/net/dsa/lantiq/*
		F: drivers/net/ethernet/lantiq_xrx200.c
		F: net/dsa/tag_gswip.c
		F: net/dsa/tag_mxl-gsw1xx.c

		LANTIQ MIPS ARCHITECTURE
		M: John Crispin <john@phrozen.org>

include/net/dsa.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,7 @@ struct tc_action;
		#define DSA_TAG_PROTO_VSC73XX_8021Q_VALUE 28
		#define DSA_TAG_PROTO_BRCM_LEGACY_FCS_VALUE 29
		#define DSA_TAG_PROTO_YT921X_VALUE 30
		#define DSA_TAG_PROTO_MXL_GSW1XX_VALUE 31

		enum dsa_tag_protocol {
		DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
		@@ -89,6 +90,7 @@ enum dsa_tag_protocol {
		DSA_TAG_PROTO_LAN937X = DSA_TAG_PROTO_LAN937X_VALUE,
		DSA_TAG_PROTO_VSC73XX_8021Q = DSA_TAG_PROTO_VSC73XX_8021Q_VALUE,
		DSA_TAG_PROTO_YT921X = DSA_TAG_PROTO_YT921X_VALUE,
		DSA_TAG_PROTO_MXL_GSW1XX = DSA_TAG_PROTO_MXL_GSW1XX_VALUE,
		};

		struct dsa_switch;

include/uapi/linux/if_ether.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -92,6 +92,7 @@
		#define ETH_P_ETHERCAT 0x88A4 /* EtherCAT */
		#define ETH_P_8021AD 0x88A8 /* 802.1ad Service VLAN */
		#define ETH_P_802_EX1 0x88B5 /* 802.1 Local Experimental 1. */
		#define ETH_P_MXLGSW 0x88C3 /* MaxLinear GSW DSA [ NOT AN OFFICIALLY REGISTERED ID ] */
		#define ETH_P_PREAUTH 0x88C7 /* 802.11 Preauthentication */
		#define ETH_P_TIPC 0x88CA /* TIPC */
		#define ETH_P_LLDP 0x88CC /* Link Layer Discovery Protocol */

net/dsa/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -104,6 +104,14 @@ config NET_DSA_TAG_MTK
		Say Y or M if you want to enable support for tagging frames for
		Mediatek switches.

		config NET_DSA_TAG_MXL_GSW1XX
		tristate "Tag driver for MaxLinear GSW1xx switches"
		help
		The GSW1xx family of switches supports an 8-byte special tag which
		can be used on the CPU port of the switch.
		Say Y or M if you want to enable support for tagging frames for
		MaxLinear GSW1xx switches.

		config NET_DSA_TAG_KSZ
		tristate "Tag driver for Microchip 8795/937x/9477/9893 families of switches"
		help

net/dsa/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@ obj-$(CONFIG_NET_DSA_TAG_HELLCREEK) += tag_hellcreek.o
		obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
		obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
		obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
		obj-$(CONFIG_NET_DSA_TAG_MXL_GSW1XX) += tag_mxl-gsw1xx.o
		obj-$(CONFIG_NET_DSA_TAG_NONE) += tag_none.o
		obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o
		obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o