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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Simon Horman , Philipp Zabel , Russell King , Geert Uytterhoeven , Magnus Damm Cc: linux-renesas-soc@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH net-next 02/11] net: dsa: tag_rzn1_a5psw: Add RZ/T2H ETHSW tag protocol and register ethsw tag driver Date: Fri, 21 Nov 2025 11:35:28 +0000 Message-ID: <20251121113553.2955854-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251121113553.2955854-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20251121113553.2955854-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar Add an explicit tag protocol for the RZ/T2H ETHSW and register a separate ethsw tag driver so the existing A5PSW tag implementation can be reused for RZ/T2H without code duplication. The ETHSW IP on RZ/T2H shares substantial commonality with the A5PSW IP on RZ/N1, and the current tag driver does not touch the register fields that differ between the two blocks. Expose a distinct DSA protocol and a second dsa_device_ops to let consumers select the RZ/T2H tag format while keeping the proven A5PSW handling unchanged. Signed-off-by: Lad Prabhakar --- include/net/dsa.h | 2 ++ include/uapi/linux/if_ether.h | 2 +- net/dsa/tag_rzn1_a5psw.c | 21 +++++++++++++++++++-- 3 files changed, 22 insertions(+), 3 deletions(-) diff --git a/include/net/dsa.h b/include/net/dsa.h index 97d5f401cfcf..81302315e493 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -57,6 +57,7 @@ struct tc_action; #define DSA_TAG_PROTO_BRCM_LEGACY_FCS_VALUE 29 #define DSA_TAG_PROTO_YT921X_VALUE 30 #define DSA_TAG_PROTO_MXL_GSW1XX_VALUE 31 +#define DSA_TAG_PROTO_RZT2H_ETHSW_VALUE 32 =20 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE =3D DSA_TAG_PROTO_NONE_VALUE, @@ -91,6 +92,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_VSC73XX_8021Q =3D DSA_TAG_PROTO_VSC73XX_8021Q_VALUE, DSA_TAG_PROTO_YT921X =3D DSA_TAG_PROTO_YT921X_VALUE, DSA_TAG_PROTO_MXL_GSW1XX =3D DSA_TAG_PROTO_MXL_GSW1XX_VALUE, + DSA_TAG_PROTO_RZT2H_ETHSW =3D DSA_TAG_PROTO_RZT2H_ETHSW_VALUE, }; =20 struct dsa_switch; diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h index 2c93b7b731c8..61f64cb38b08 100644 --- a/include/uapi/linux/if_ether.h +++ b/include/uapi/linux/if_ether.h @@ -118,7 +118,7 @@ #define ETH_P_YT921X 0x9988 /* Motorcomm YT921x DSA [ NOT AN OFFICIALLY R= EGISTERED ID ] */ #define ETH_P_EDSA 0xDADA /* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED= ID ] */ #define ETH_P_DSA_8021Q 0xDADB /* Fake VLAN Header for DSA [ NOT AN OFFIC= IALLY REGISTERED ID ] */ -#define ETH_P_DSA_A5PSW 0xE001 /* A5PSW Tag Value [ NOT AN OFFICIALLY REG= ISTERED ID ] */ +#define ETH_P_DSA_A5PSW 0xE001 /* A5PSW/ETHSW Tag Value [ NOT AN OFFICIAL= LY REGISTERED ID ] */ #define ETH_P_IFE 0xED3E /* ForCES inter-FE LFB type */ #define ETH_P_AF_IUCV 0xFBFB /* IBM af_iucv [ NOT AN OFFICIALLY REGISTE= RED ID ] */ =20 diff --git a/net/dsa/tag_rzn1_a5psw.c b/net/dsa/tag_rzn1_a5psw.c index 201782b4f8dc..66619986fa71 100644 --- a/net/dsa/tag_rzn1_a5psw.c +++ b/net/dsa/tag_rzn1_a5psw.c @@ -23,6 +23,7 @@ */ =20 #define A5PSW_NAME "a5psw" +#define ETHSW_NAME "ethsw" =20 #define A5PSW_TAG_LEN 8 #define A5PSW_CTRL_DATA_FORCE_FORWARD BIT(0) @@ -108,8 +109,24 @@ static const struct dsa_device_ops a5psw_netdev_ops = =3D { .rcv =3D a5psw_tag_rcv, .needed_headroom =3D A5PSW_TAG_LEN, }; +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_A5PSW, A5PSW_NAME); +DSA_TAG_DRIVER(a5psw_netdev_ops); + +static const struct dsa_device_ops ethsw_netdev_ops =3D { + .name =3D ETHSW_NAME, + .proto =3D DSA_TAG_PROTO_RZT2H_ETHSW, + .xmit =3D a5psw_tag_xmit, + .rcv =3D a5psw_tag_rcv, + .needed_headroom =3D A5PSW_TAG_LEN, +}; +MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_RZT2H_ETHSW, ETHSW_NAME); +DSA_TAG_DRIVER(ethsw_netdev_ops); + +static struct dsa_tag_driver *dsa_tag_driver_array[] =3D { + &DSA_TAG_DRIVER_NAME(a5psw_netdev_ops), + &DSA_TAG_DRIVER_NAME(ethsw_netdev_ops), +}; +module_dsa_tag_drivers(dsa_tag_driver_array); =20 MODULE_DESCRIPTION("DSA tag driver for Renesas RZ/N1 A5PSW switch"); MODULE_LICENSE("GPL v2"); -MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_A5PSW, A5PSW_NAME); -module_dsa_tag_driver(a5psw_netdev_ops); --=20 2.52.0