netdev - [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: use mv88e6185_g1_vtu

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Date:   Mon, 25 Jan 2021 16:04:49 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: use mv88e6185_g1_vtu_loadpurge() for the 6250

Apart from the mask used to get the high bits of the fid,
mv88e6185_g1_vtu_loadpurge() and mv88e6250_g1_vtu_loadpurge() are
identical. Since the entry->fid passed in should never exceed the
number of databases, we can simply use the former as-is as replacement
for the latter.

Suggested-by: Tobias Waldekranz <tobias@...dekranz.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
---
 drivers/net/dsa/mv88e6xxx/chip.c        |  2 +-
 drivers/net/dsa/mv88e6xxx/global1.h     |  2 --
 drivers/net/dsa/mv88e6xxx/global1_vtu.c | 33 +++----------------------
 3 files changed, 5 insertions(+), 32 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 8a0df1e903bf..7e1bbb400e8a 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -4024,7 +4024,7 @@ static const struct mv88e6xxx_ops mv88e6250_ops = {
 	.pot_clear = mv88e6xxx_g2_pot_clear,
 	.reset = mv88e6250_g1_reset,
 	.vtu_getnext = mv88e6185_g1_vtu_getnext,
-	.vtu_loadpurge = mv88e6250_g1_vtu_loadpurge,
+	.vtu_loadpurge = mv88e6185_g1_vtu_loadpurge,
 	.avb_ops = &mv88e6352_avb_ops,
 	.ptp_ops = &mv88e6250_ptp_ops,
 	.phylink_validate = mv88e6065_phylink_validate,
diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index d2dd2f4e4730..7c396964d0b2 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -336,8 +336,6 @@ int mv88e6185_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
 			     struct mv88e6xxx_vtu_entry *entry);
 int mv88e6185_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
 			       struct mv88e6xxx_vtu_entry *entry);
-int mv88e6250_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
-			       struct mv88e6xxx_vtu_entry *entry);
 int mv88e6352_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
 			     struct mv88e6xxx_vtu_entry *entry);
 int mv88e6352_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
diff --git a/drivers/net/dsa/mv88e6xxx/global1_vtu.c b/drivers/net/dsa/mv88e6xxx/global1_vtu.c
index 519ae48ba96e..ae12c981923e 100644
--- a/drivers/net/dsa/mv88e6xxx/global1_vtu.c
+++ b/drivers/net/dsa/mv88e6xxx/global1_vtu.c
@@ -434,35 +434,6 @@ int mv88e6390_g1_vtu_getnext(struct mv88e6xxx_chip *chip,
 	return 0;
 }
 
-int mv88e6250_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
-			       struct mv88e6xxx_vtu_entry *entry)
-{
-	u16 op = MV88E6XXX_G1_VTU_OP_VTU_LOAD_PURGE;
-	int err;
-
-	err = mv88e6xxx_g1_vtu_op_wait(chip);
-	if (err)
-		return err;
-
-	err = mv88e6xxx_g1_vtu_vid_write(chip, entry);
-	if (err)
-		return err;
-
-	if (entry->valid) {
-		err = mv88e6185_g1_vtu_data_write(chip, entry);
-		if (err)
-			return err;
-
-		/* VTU DBNum[3:0] are located in VTU Operation 3:0
-		 * VTU DBNum[5:4] are located in VTU Operation 9:8
-		 */
-		op |= entry->fid & 0x000f;
-		op |= (entry->fid & 0x0030) << 4;
-	}
-
-	return mv88e6xxx_g1_vtu_op(chip, op);
-}
-
 int mv88e6185_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
 			       struct mv88e6xxx_vtu_entry *entry)
 {
@@ -484,6 +455,10 @@ int mv88e6185_g1_vtu_loadpurge(struct mv88e6xxx_chip *chip,
 
 		/* VTU DBNum[3:0] are located in VTU Operation 3:0
 		 * VTU DBNum[7:4] are located in VTU Operation 11:8
+		 *
+		 * For the 6250/6220, the latter are really [5:4] and
+		 * 9:8, but in those cases bits 7:6 of entry->fid are
+		 * 0 since they have num_databases = 64.
 		 */
 		op |= entry->fid & 0x000f;
 		op |= (entry->fid & 0x00f0) << 4;
-- 
2.23.0