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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Russell King , linux-kernel@vger.kernel.org Subject: [PATCH net-next v6 1/5] net: dsa: tag_yt921x: clarify priority and code fields Date: Sat, 31 Jan 2026 10:18:47 +0800 Message-ID: <20260131021854.3405036-2-mmyangfl@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260131021854.3405036-1-mmyangfl@gmail.com> References: <20260131021854.3405036-1-mmyangfl@gmail.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" Packet priority is part of the tag, and the priority and code fields are used by tx and rx. Make revisions to reflect the facts. Signed-off-by: David Yang --- net/dsa/tag_yt921x.c | 83 ++++++++++++++++++++++++++++---------------- 1 file changed, 53 insertions(+), 30 deletions(-) diff --git a/net/dsa/tag_yt921x.c b/net/dsa/tag_yt921x.c index 6bbfd42dc5df..098863d491ff 100644 --- a/net/dsa/tag_yt921x.c +++ b/net/dsa/tag_yt921x.c @@ -14,11 +14,14 @@ * are conflicts somewhere and/or you want to change it for some reaso= n. * Tag: * 2: VLAN Tag - * 2: Rx Port + * 2: * 15b: Rx Port Valid * 14b-11b: Rx Port - * 10b-0b: Cmd? - * 2: Tx Port(s) + * 10b-8b: Tx/Rx Priority + * 7b: Tx/Rx Code Valid + * 6b-1b: Tx/Rx Code + * 0b: ? (unset) + * 2: * 15b: Tx Port(s) Valid * 10b-0b: Tx Port(s) Mask */ @@ -33,18 +36,30 @@ =20 #define YT921X_TAG_PORT_EN BIT(15) #define YT921X_TAG_RX_PORT_M GENMASK(14, 11) -#define YT921X_TAG_RX_CMD_M GENMASK(10, 0) -#define YT921X_TAG_RX_CMD(x) FIELD_PREP(YT921X_TAG_RX_CMD_M, (x)) -#define YT921X_TAG_RX_CMD_FORWARDED 0x80 -#define YT921X_TAG_RX_CMD_UNK_UCAST 0xb2 -#define YT921X_TAG_RX_CMD_UNK_MCAST 0xb4 -#define YT921X_TAG_TX_PORTS GENMASK(10, 0) +#define YT921X_TAG_PRIO_M GENMASK(10, 8) +#define YT921X_TAG_PRIO(x) FIELD_PREP(YT921X_TAG_PRIO_M, (x)) +#define YT921X_TAG_CODE_EN BIT(7) +#define YT921X_TAG_CODE_M GENMASK(6, 1) +#define YT921X_TAG_CODE(x) FIELD_PREP(YT921X_TAG_CODE_M, (x)) +#define YT921X_TAG_TX_PORTS_M GENMASK(10, 0) +#define YT921X_TAG_TX_PORTS(x) FIELD_PREP(YT921X_TAG_TX_PORTS_M, (x)) + +/* Incomplete. Some are configurable via RMA_CTRL_CPU_CODE, the meaning of + * others remains unknown. + */ +enum yt921x_tag_code { + YT921X_TAG_CODE_FORWARD =3D 0, + YT921X_TAG_CODE_UNK_UCAST =3D 0x19, + YT921X_TAG_CODE_UNK_MCAST =3D 0x1a, + YT921X_TAG_CODE_PORT_COPY =3D 0x1b, + YT921X_TAG_CODE_FDB_COPY =3D 0x1c, +}; =20 static struct sk_buff * yt921x_tag_xmit(struct sk_buff *skb, struct net_device *netdev) { __be16 *tag; - u16 tx; + u16 ctrl; =20 skb_push(skb, YT921X_TAG_LEN); dsa_alloc_etype_header(skb, YT921X_TAG_LEN); @@ -55,9 +70,9 @@ yt921x_tag_xmit(struct sk_buff *skb, struct net_device *n= etdev) /* VLAN tag unrelated when TX */ tag[1] =3D 0; tag[2] =3D 0; - tx =3D FIELD_PREP(YT921X_TAG_TX_PORTS, dsa_xmit_port_mask(skb, netdev)) | - YT921X_TAG_PORT_EN; - tag[3] =3D htons(tx); + ctrl =3D YT921X_TAG_TX_PORTS(dsa_xmit_port_mask(skb, netdev)) | + YT921X_TAG_PORT_EN; + tag[3] =3D htons(ctrl); =20 return skb; } @@ -67,7 +82,6 @@ yt921x_tag_rcv(struct sk_buff *skb, struct net_device *ne= tdev) { unsigned int port; __be16 *tag; - u16 cmd; u16 rx; =20 if (unlikely(!pskb_may_pull(skb, YT921X_TAG_LEN))) @@ -98,23 +112,32 @@ yt921x_tag_rcv(struct sk_buff *skb, struct net_device = *netdev) return NULL; } =20 - cmd =3D FIELD_GET(YT921X_TAG_RX_CMD_M, rx); - switch (cmd) { - case YT921X_TAG_RX_CMD_FORWARDED: - /* Already forwarded by hardware */ - dsa_default_offload_fwd_mark(skb); - break; - case YT921X_TAG_RX_CMD_UNK_UCAST: - case YT921X_TAG_RX_CMD_UNK_MCAST: - /* NOTE: hardware doesn't distinguish between TRAP (copy to CPU - * only) and COPY (forward and copy to CPU). In order to perform - * a soft switch, NEVER use COPY action in the switch driver. - */ - break; - default: + if (!(rx & YT921X_TAG_CODE_EN)) { dev_warn_ratelimited(&netdev->dev, - "Unexpected rx cmd 0x%02x\n", cmd); - break; + "Tag code not enabled in rx packet\n"); + } else { + u16 code =3D FIELD_GET(YT921X_TAG_CODE_M, rx); + + switch (code) { + case YT921X_TAG_CODE_FORWARD: + case YT921X_TAG_CODE_PORT_COPY: + case YT921X_TAG_CODE_FDB_COPY: + /* Already forwarded by hardware */ + dsa_default_offload_fwd_mark(skb); + break; + case YT921X_TAG_CODE_UNK_UCAST: + case YT921X_TAG_CODE_UNK_MCAST: + /* NOTE: hardware doesn't distinguish between TRAP (copy + * to CPU only) and COPY (forward and copy to CPU). In + * order to perform a soft switch, NEVER use COPY action + * in the switch driver. + */ + break; + default: + dev_warn_ratelimited(&netdev->dev, + "Unknown code 0x%02x\n", code); + break; + } } =20 /* Remove YT921x tag and update checksum */ --=20 2.51.0