realtek: refactor keep vlan tag setup, fix tagged forwarding

The code in dsa.c:rtl83xx_port_enable() was trying to set
vlan_port_tag_sts_ctrl while dealing with differences between SoCs.
However, not only that register has a different address, the register
structure and even the 2-bit value semantic changes for each SoC.

The vlan_port_tag_sts_ctrl field was dropped and converted into a
vlan_port_keep_incoming_tag_set() function that abstracts the different
between SoCs. The macro referencing that register migrated to the SoC
specific c file as it will be privately used by each file.

All magic numbers were converted into macros using BITMASK and
FIELD_PREP.

The vlan_port_tag_sts_ctrl debugfs was dropped for now as it is already
broken for rtl93xx. The best place for SoC specific code might be in each
respective c file and not in if/else clauses.

The final result is:

rtl838x: set ITAG_STS=TAGGED, same as before
rtl839x: set ITAG_STS=TAGGED instead of IGR_P_ITAG_KEEP=0x1, fixing
	 forwarding of tagged packets
rtl930x: set EGR_ITAG_STS=TAGGED instead of IGR_P_ITAG=0x1, possibly
	 fixing forwarding of tagged packets
rtl931x: set EGR_ITAG_STS=TAGGED instead of OTPID_KEEP=0x1, possibly
         fixing forwarding of tagged packets

Without (EGR_)ITAG_STS=TAGGED, at least for rtl839x, forwarded packets
will drop the vlan tag while packets from the CPU will still have the
correct tag.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/debugfs.c

@@ -482,10 +482,6 @@ static int rtl838x_dbgfs_port_init(struct dentry *parent, struct rtl838x_switch_
 
 		debugfs_create_x32("storm_rate_bc", 0644, port_dir,
 				(u32 *)(RTL838X_SW_BASE + RTL838X_STORM_CTRL_PORT_BC(port)));
-
-		debugfs_create_x32("vlan_port_tag_sts_ctrl", 0644, port_dir,
-				(u32 *)(RTL838X_SW_BASE + RTL838X_VLAN_PORT_TAG_STS_CTRL 
-				+ (port << 2)));
 	} else {
 		debugfs_create_x32("storm_rate_uc", 0644, port_dir,
 				(u32 *)(RTL838X_SW_BASE + RTL839X_STORM_CTRL_PORT_UC_0(port)));
@@ -495,10 +491,6 @@ static int rtl838x_dbgfs_port_init(struct dentry *parent, struct rtl838x_switch_
 
 		debugfs_create_x32("storm_rate_bc", 0644, port_dir,
 				(u32 *)(RTL838X_SW_BASE + RTL839X_STORM_CTRL_PORT_BC_0(port)));
-
-		debugfs_create_x32("vlan_port_tag_sts_ctrl", 0644, port_dir,
-				(u32 *)(RTL838X_SW_BASE + RTL839X_VLAN_PORT_TAG_STS_CTRL
-				+ (port << 2)));
 	}
 
 	debugfs_create_u32("id", 0444, port_dir, (u32 *)&priv->ports[port].dp->index);

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c

@@ -1063,10 +1063,7 @@ static int rtl83xx_port_enable(struct dsa_switch *ds, int port,
 	priv->ports[port].enable = true;
 
 	/* enable inner tagging on egress, do not keep any tags */
-	if (priv->family_id == RTL9310_FAMILY_ID)
+	priv->r->vlan_port_keep_tag_set(port, 0, 1);
-		sw_w32(BIT(4), priv->r->vlan_port_tag_sts_ctrl + (port << 2));
-	else
-		sw_w32(1, priv->r->vlan_port_tag_sts_ctrl + (port << 2));
 
 	if (dsa_is_cpu_port(ds, port))
 		return 0;

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/rtl838x.c

@@ -6,6 +6,22 @@
 
 #include "rtl83xx.h"
 
+#define RTL838X_VLAN_PORT_TAG_STS_UNTAG				0x0
+#define RTL838X_VLAN_PORT_TAG_STS_TAGGED			0x1
+#define RTL838X_VLAN_PORT_TAG_STS_PRIORITY_TAGGED		0x2
+
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_BASE			0xA530
+/* port 0-28 */
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL(port) \
+		RTL838X_VLAN_PORT_TAG_STS_CTRL_BASE + (port << 2)
+
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_EGR_P_OTAG_KEEP_MASK	GENMASK(11,10)
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_EGR_P_ITAG_KEEP_MASK	GENMASK(9,8)
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_IGR_P_OTAG_KEEP_MASK	GENMASK(7,6)
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_IGR_P_ITAG_KEEP_MASK	GENMASK(5,4)
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_OTAG_STS_MASK		GENMASK(3,2)
+#define RTL838X_VLAN_PORT_TAG_STS_CTRL_ITAG_STS_MASK		GENMASK(1,0)
+
 extern struct mutex smi_lock;
 
 // see_dal_maple_acl_log2PhyTmplteField and src/app/diag_v2/src/diag_acl.c
@@ -1612,6 +1628,15 @@ static int rtl838x_l3_setup(struct rtl838x_switch_priv *priv)
 	return 0;
 }
 
+void rtl838x_vlan_port_keep_tag_set(int port, bool keep_outer, bool keep_inner)
+{
+	sw_w32(FIELD_PREP(RTL838X_VLAN_PORT_TAG_STS_CTRL_OTAG_STS_MASK,
+			  keep_outer ? RTL838X_VLAN_PORT_TAG_STS_TAGGED : RTL838X_VLAN_PORT_TAG_STS_UNTAG) |
+	       FIELD_PREP(RTL838X_VLAN_PORT_TAG_STS_CTRL_ITAG_STS_MASK,
+			  keep_inner ? RTL838X_VLAN_PORT_TAG_STS_TAGGED : RTL838X_VLAN_PORT_TAG_STS_UNTAG),
+	       RTL838X_VLAN_PORT_TAG_STS_CTRL(port));
+}
+
 void rtl838x_vlan_port_pvidmode_set(int port, enum pbvlan_type type, enum pbvlan_mode mode)
 {
 	if (type == PBVLAN_TYPE_INNER)
@@ -1742,7 +1767,7 @@ const struct rtl838x_reg rtl838x_reg = {
 	.write_l2_entry_using_hash = rtl838x_write_l2_entry_using_hash,
 	.read_cam = rtl838x_read_cam,
 	.write_cam = rtl838x_write_cam,
-	.vlan_port_tag_sts_ctrl = RTL838X_VLAN_PORT_TAG_STS_CTRL,
+	.vlan_port_keep_tag_set = rtl838x_vlan_port_keep_tag_set,
 	.vlan_port_pvidmode_set = rtl838x_vlan_port_pvidmode_set,
 	.vlan_port_pvid_set = rtl838x_vlan_port_pvid_set,
 	.trk_mbr_ctr = rtl838x_trk_mbr_ctr,

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/rtl838x.h

@@ -69,29 +69,24 @@
 #define RTL838X_VLAN_PORT_EGR_FLTR		(0x3A84)
 #define RTL838X_VLAN_PORT_PB_VLAN		(0x3C00)
 #define RTL838X_VLAN_PORT_IGR_FLTR		(0x3A7C)
-#define RTL838X_VLAN_PORT_TAG_STS_CTRL		(0xA530)
 
 #define RTL839X_VLAN_PROFILE(idx)		(0x25C0 + (((idx) << 3)))
 #define RTL839X_VLAN_CTRL			(0x26D4)
 #define RTL839X_VLAN_PORT_PB_VLAN		(0x26D8)
 #define RTL839X_VLAN_PORT_IGR_FLTR		(0x27B4)
 #define RTL839X_VLAN_PORT_EGR_FLTR		(0x27C4)
-#define RTL839X_VLAN_PORT_TAG_STS_CTRL		(0x6828)
-#define RTL839X_VLAN_PORT_TAG_STS_CTRL		(0x6828)
 
 #define RTL930X_VLAN_PROFILE_SET(idx)		(0x9c60 + (((idx) * 20)))
 #define RTL930X_VLAN_CTRL			(0x82D4)
 #define RTL930X_VLAN_PORT_PB_VLAN		(0x82D8)
 #define RTL930X_VLAN_PORT_IGR_FLTR		(0x83C0)
 #define RTL930X_VLAN_PORT_EGR_FLTR		(0x83C8)
-#define RTL930X_VLAN_PORT_TAG_STS_CTRL		(0xCE24)
 
 #define RTL931X_VLAN_PROFILE_SET(idx)		(0x9800 + (((idx) * 28)))
 #define RTL931X_VLAN_CTRL			(0x94E4)
 #define RTL931X_VLAN_PORT_IGR_CTRL		(0x94E8)
 #define RTL931X_VLAN_PORT_IGR_FLTR		(0x96B4)
 #define RTL931X_VLAN_PORT_EGR_FLTR		(0x96C4)
-#define RTL931X_VLAN_PORT_TAG_CTRL		(0x4860)
 
 /* Table access registers */
 #define RTL838X_TBL_ACCESS_CTRL_0		(0x6914)
@@ -980,6 +975,7 @@ struct rtl838x_reg {
 	void (*vlan_profile_setup)(int profile);
 	void (*vlan_port_pvidmode_set)(int port, enum pbvlan_type type, enum pbvlan_mode mode);
 	void (*vlan_port_pvid_set)(int port, enum pbvlan_type type, int pvid);
+	void (*vlan_port_keep_tag_set)(int port, bool keep_outer, bool keep_inner);
 	void (*set_vlan_igr_filter)(int port, enum igr_filter state);
 	void (*set_vlan_egr_filter)(int port, enum egr_filter state);
 	void (*enable_learning)(int port, bool enable);
@@ -1005,8 +1001,6 @@ struct rtl838x_reg {
 	void (*write_l2_entry_using_hash)(u32 hash, u32 pos, struct rtl838x_l2_entry *e);
 	u64 (*read_cam)(int idx, struct rtl838x_l2_entry *e);
 	void (*write_cam)(int idx, struct rtl838x_l2_entry *e);
-	int vlan_port_tag_sts_ctrl;
-	int (*rtl838x_vlan_port_tag_sts_ctrl)(int port);
 	int (*trk_mbr_ctr)(int group);
 	int rma_bpdu_fld_pmask;
 	int spcl_trap_eapol_ctrl;

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/rtl839x.c

@@ -3,6 +3,21 @@
 #include <asm/mach-rtl838x/mach-rtl83xx.h>
 #include "rtl83xx.h"
 
+#define RTL839X_VLAN_PORT_TAG_STS_UNTAG				0x0
+#define RTL839X_VLAN_PORT_TAG_STS_TAGGED			0x1
+#define RTL839X_VLAN_PORT_TAG_STS_PRIORITY_TAGGED		0x2
+
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_BASE			0x6828
+/* port 0-52 */
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL(port) \
+		RTL839X_VLAN_PORT_TAG_STS_CTRL_BASE + (port << 2)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_OTAG_STS_MASK		GENMASK(7,6)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_ITAG_STS_MASK		GENMASK(5,4)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_EGR_P_OTAG_KEEP_MASK	GENMASK(3,3)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_EGR_P_ITAG_KEEP_MASK	GENMASK(2,2)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_IGR_P_OTAG_KEEP_MASK	GENMASK(1,1)
+#define RTL839X_VLAN_PORT_TAG_STS_CTRL_IGR_P_ITAG_KEEP_MASK	GENMASK(0,0)
+
 extern struct mutex smi_lock;
 extern struct rtl83xx_soc_info soc_info;
 
@@ -1755,6 +1770,15 @@ int rtl839x_l3_setup(struct rtl838x_switch_priv *priv)
 	return 0;
 }
 
+void rtl839x_vlan_port_keep_tag_set(int port, bool keep_outer, bool keep_inner)
+{
+	sw_w32(FIELD_PREP(RTL839X_VLAN_PORT_TAG_STS_CTRL_OTAG_STS_MASK,
+			  keep_outer ? RTL839X_VLAN_PORT_TAG_STS_TAGGED : RTL839X_VLAN_PORT_TAG_STS_UNTAG) |
+	       FIELD_PREP(RTL839X_VLAN_PORT_TAG_STS_CTRL_ITAG_STS_MASK,
+			  keep_inner ? RTL839X_VLAN_PORT_TAG_STS_TAGGED : RTL839X_VLAN_PORT_TAG_STS_UNTAG),
+	       RTL839X_VLAN_PORT_TAG_STS_CTRL(port));
+}
+
 void rtl839x_vlan_port_pvidmode_set(int port, enum pbvlan_type type, enum pbvlan_mode mode)
 {
 	if (type == PBVLAN_TYPE_INNER)
@@ -1860,6 +1884,7 @@ const struct rtl838x_reg rtl839x_reg = {
 	.vlan_profile_dump = rtl839x_vlan_profile_dump,
 	.vlan_profile_setup = rtl839x_vlan_profile_setup,
 	.vlan_fwd_on_inner = rtl839x_vlan_fwd_on_inner,
+	.vlan_port_keep_tag_set = rtl839x_vlan_port_keep_tag_set,
 	.vlan_port_pvidmode_set = rtl839x_vlan_port_pvidmode_set,
 	.vlan_port_pvid_set = rtl839x_vlan_port_pvid_set,
 	.set_vlan_igr_filter = rtl839x_set_igr_filter,
@@ -1886,7 +1911,6 @@ const struct rtl838x_reg rtl839x_reg = {
 	.write_l2_entry_using_hash = rtl839x_write_l2_entry_using_hash,
 	.read_cam = rtl839x_read_cam,
 	.write_cam = rtl839x_write_cam,
-	.vlan_port_tag_sts_ctrl = RTL839X_VLAN_PORT_TAG_STS_CTRL,
 	.trk_mbr_ctr = rtl839x_trk_mbr_ctr,
 	.rma_bpdu_fld_pmask = RTL839X_RMA_BPDU_FLD_PMSK,
 	.spcl_trap_eapol_ctrl = RTL839X_SPCL_TRAP_EAPOL_CTRL,

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/rtl930x.c

@@ -5,6 +5,22 @@
 
 #include "rtl83xx.h"
 
+#define RTL930X_VLAN_PORT_TAG_STS_INTERNAL			0x0
+#define RTL930X_VLAN_PORT_TAG_STS_UNTAG				0x1
+#define RTL930X_VLAN_PORT_TAG_STS_TAGGED			0x2
+#define RTL930X_VLAN_PORT_TAG_STS_PRIORITY_TAGGED		0x3
+
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_BASE			0xCE24
+/* port 0-28 */
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL(port) \
+		RTL930X_VLAN_PORT_TAG_STS_CTRL_BASE + (port << 2)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_OTAG_STS_MASK	GENMASK(7,6)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_ITAG_STS_MASK	GENMASK(5,4)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_P_OTAG_KEEP_MASK	GENMASK(3,3)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_P_ITAG_KEEP_MASK	GENMASK(2,2)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_IGR_P_OTAG_KEEP_MASK	GENMASK(1,1)
+#define RTL930X_VLAN_PORT_TAG_STS_CTRL_IGR_P_ITAG_KEEP_MASK	GENMASK(0,0)
+
 extern struct mutex smi_lock;
 extern struct rtl83xx_soc_info soc_info;
 
@@ -2300,6 +2316,15 @@ static void rtl930x_packet_cntr_clear(int counter)
 	rtl_table_release(r);
 }
 
+void rtl930x_vlan_port_keep_tag_set(int port, bool keep_outer, bool keep_inner)
+{
+	sw_w32(FIELD_PREP(RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_OTAG_STS_MASK,
+			  keep_outer ? RTL930X_VLAN_PORT_TAG_STS_TAGGED : RTL930X_VLAN_PORT_TAG_STS_UNTAG) |
+	       FIELD_PREP(RTL930X_VLAN_PORT_TAG_STS_CTRL_EGR_ITAG_STS_MASK,
+			  keep_inner ? RTL930X_VLAN_PORT_TAG_STS_TAGGED : RTL930X_VLAN_PORT_TAG_STS_UNTAG),
+	       RTL930X_VLAN_PORT_TAG_STS_CTRL(port));
+}
+
 void rtl930x_vlan_port_pvidmode_set(int port, enum pbvlan_type type, enum pbvlan_mode mode)
 {
 	if (type == PBVLAN_TYPE_INNER)
@@ -2498,7 +2523,7 @@ const struct rtl838x_reg rtl930x_reg = {
 	.write_l2_entry_using_hash = rtl930x_write_l2_entry_using_hash,
 	.read_cam = rtl930x_read_cam,
 	.write_cam = rtl930x_write_cam,
-	.vlan_port_tag_sts_ctrl = RTL930X_VLAN_PORT_TAG_STS_CTRL,
+	.vlan_port_keep_tag_set = rtl930x_vlan_port_keep_tag_set,
 	.vlan_port_pvidmode_set = rtl930x_vlan_port_pvidmode_set,
 	.vlan_port_pvid_set = rtl930x_vlan_port_pvid_set,
 	.trk_mbr_ctr = rtl930x_trk_mbr_ctr,

target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/rtl931x.c

@@ -3,6 +3,26 @@
 #include <asm/mach-rtl838x/mach-rtl83xx.h>
 #include "rtl83xx.h"
 
+#define RTL931X_VLAN_PORT_TAG_STS_INTERNAL			0x0
+#define RTL931X_VLAN_PORT_TAG_STS_UNTAG				0x1
+#define RTL931X_VLAN_PORT_TAG_STS_TAGGED			0x2
+#define RTL931X_VLAN_PORT_TAG_STS_PRIORITY_TAGGED		0x3
+
+#define RTL931X_VLAN_PORT_TAG_CTRL_BASE				0x4860
+/* port 0-56 */
+#define RTL931X_VLAN_PORT_TAG_CTRL(port) \
+		RTL931X_VLAN_PORT_TAG_CTRL_BASE + (port << 2)
+#define RTL931X_VLAN_PORT_TAG_EGR_OTAG_STS_MASK			GENMASK(13,12)
+#define RTL931X_VLAN_PORT_TAG_EGR_ITAG_STS_MASK			GENMASK(11,10)
+#define RTL931X_VLAN_PORT_TAG_EGR_OTAG_KEEP_MASK		GENMASK(9,9)
+#define RTL931X_VLAN_PORT_TAG_EGR_ITAG_KEEP_MASK		GENMASK(8,8)
+#define RTL931X_VLAN_PORT_TAG_IGR_OTAG_KEEP_MASK		GENMASK(7,7)
+#define RTL931X_VLAN_PORT_TAG_IGR_ITAG_KEEP_MASK		GENMASK(6,6)
+#define RTL931X_VLAN_PORT_TAG_OTPID_IDX_MASK			GENMASK(5,4)
+#define RTL931X_VLAN_PORT_TAG_OTPID_KEEP_MASK			GENMASK(3,3)
+#define RTL931X_VLAN_PORT_TAG_ITPID_IDX_MASK			GENMASK(2,1)
+#define RTL931X_VLAN_PORT_TAG_ITPID_KEEP_MASK			GENMASK(0,0)
+
 extern struct mutex smi_lock;
 extern struct rtl83xx_soc_info soc_info;
 
@@ -1470,6 +1490,15 @@ int rtl931x_l3_setup(struct rtl838x_switch_priv *priv)
 	return 0;
 }
 
+void rtl931x_vlan_port_keep_tag_set(int port, bool keep_outer, bool keep_inner)
+{
+	sw_w32(FIELD_PREP(RTL931X_VLAN_PORT_TAG_EGR_OTAG_STS_MASK,
+			  keep_outer ? RTL931X_VLAN_PORT_TAG_STS_TAGGED : RTL931X_VLAN_PORT_TAG_STS_UNTAG) |
+	       FIELD_PREP(RTL931X_VLAN_PORT_TAG_EGR_ITAG_STS_MASK,
+			  keep_inner ? RTL931X_VLAN_PORT_TAG_STS_TAGGED : RTL931X_VLAN_PORT_TAG_STS_UNTAG),
+	       RTL931X_VLAN_PORT_TAG_CTRL(port));
+}
+
 void rtl931x_vlan_port_pvidmode_set(int port, enum pbvlan_type type, enum pbvlan_mode mode)
 {
 	if (type == PBVLAN_TYPE_INNER)
@@ -1651,7 +1680,7 @@ const struct rtl838x_reg rtl931x_reg = {
 	.write_l2_entry_using_hash = rtl931x_write_l2_entry_using_hash,
 	.read_cam = rtl931x_read_cam,
 	.write_cam = rtl931x_write_cam,
-	.vlan_port_tag_sts_ctrl = RTL931X_VLAN_PORT_TAG_CTRL,
+	.vlan_port_keep_tag_set = rtl931x_vlan_port_keep_tag_set,
 	.vlan_port_pvidmode_set = rtl931x_vlan_port_pvidmode_set,
 	.vlan_port_pvid_set = rtl931x_vlan_port_pvid_set,
 	.trk_mbr_ctr = rtl931x_trk_mbr_ctr,