[PATCH net-next 1/2] net: dsa: lan9303: Add port_fast_age and port_fdb_dump methods

From: Egil Hjelmeland
Date: Wed Oct 18 2017 - 07:00:26 EST

Add DSA method port_fast_age as a step to STP support.

Add low level functions for accessing the lan9303 ALR (Address Logic
Resolution).

Added DSA method port_fdb_dump

Signed-off-by: Egil Hjelmeland <privat@xxxxxxxxxxxxxxxxxx>
---
drivers/net/dsa/lan9303-core.c | 159 +++++++++++++++++++++++++++++++++++++++++
drivers/net/dsa/lan9303.h | 2 +
2 files changed, 161 insertions(+)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index fecfe1fe67ea..8b5202f3c0b0 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -124,6 +124,21 @@
#define LAN9303_MAC_RX_CFG_2 0x0c01
#define LAN9303_MAC_TX_CFG_2 0x0c40
#define LAN9303_SWE_ALR_CMD 0x1800
+# define ALR_CMD_MAKE_ENTRY BIT(2)
+# define ALR_CMD_GET_FIRST BIT(1)
+# define ALR_CMD_GET_NEXT BIT(0)
+#define LAN9303_SWE_ALR_WR_DAT_0 0x1801
+#define LAN9303_SWE_ALR_WR_DAT_1 0x1802
+# define ALR_DAT1_VALID BIT(26)
+# define ALR_DAT1_END_OF_TABL BIT(25)
+# define ALR_DAT1_AGE_OVERRID BIT(25)
+# define ALR_DAT1_STATIC BIT(24)
+# define ALR_DAT1_PORT_BITOFFS 16
+# define ALR_DAT1_PORT_MASK (7 << ALR_DAT1_PORT_BITOFFS)
+#define LAN9303_SWE_ALR_RD_DAT_0 0x1805
+#define LAN9303_SWE_ALR_RD_DAT_1 0x1806
+#define LAN9303_SWE_ALR_CMD_STS 0x1808
+# define ALR_STS_MAKE_PEND BIT(0)
#define LAN9303_SWE_VLAN_CMD 0x180b
# define LAN9303_SWE_VLAN_CMD_RNW BIT(5)
# define LAN9303_SWE_VLAN_CMD_PVIDNVLAN BIT(4)
@@ -478,6 +493,125 @@ static int lan9303_detect_phy_setup(struct lan9303 *chip)
return 0;
}

+/* ----------------- Address Logic Resolution (ALR)------------------*/
+
+/* Map ALR-port bits to port bitmap, and back*/
+static const int alrport_2_portmap[] = {1, 2, 4, 0, 3, 5, 6, 7 };
+static const int portmap_2_alrport[] = {3, 0, 1, 4, 2, 5, 6, 7 };
+
+/* ALR: Actual register access functions */
+
+/* This function will wait a while until mask & reg == value */
+/* Otherwise, return timeout */
+static int lan9303_csr_reg_wait(struct lan9303 *chip, int regno,
+ int mask, char value)
+{
+ int i;
+
+ for (i = 0; i < 0x1000; i++) {
+ u32 reg;
+
+ lan9303_read_switch_reg(chip, regno, &reg);
+ if ((reg & mask) == value)
+ return 0;
+ usleep_range(1000, 2000);
+ }
+ return -ETIMEDOUT;
+}
+
+static int lan9303_alr_make_entry_raw(struct lan9303 *chip, u32 dat0, u32 dat1)
+{
+ lan9303_write_switch_reg(
+ chip, LAN9303_SWE_ALR_WR_DAT_0, dat0);
+ lan9303_write_switch_reg(
+ chip, LAN9303_SWE_ALR_WR_DAT_1, dat1);
+ lan9303_write_switch_reg(
+ chip, LAN9303_SWE_ALR_CMD, ALR_CMD_MAKE_ENTRY);
+ lan9303_csr_reg_wait(
+ chip, LAN9303_SWE_ALR_CMD_STS, ALR_STS_MAKE_PEND, 0);
+ lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
+ return 0;
+}
+
+typedef void alr_loop_cb_t(struct lan9303 *chip, u32 dat0, u32 dat1,
+ int portmap, void *ctx);
+
+static void lan9303_alr_loop(struct lan9303 *chip, alr_loop_cb_t *cb, void *ctx)
+{
+ int i;
+
+ lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, ALR_CMD_GET_FIRST);
+ lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
+
+ for (i = 1; i < LAN9303_NUM_ALR_RECORDS; i++) {
+ u32 dat0, dat1;
+ int alrport, portmap;
+
+ lan9303_read_switch_reg(chip, LAN9303_SWE_ALR_RD_DAT_0, &dat0);
+ lan9303_read_switch_reg(chip, LAN9303_SWE_ALR_RD_DAT_1, &dat1);
+ if (dat1 & ALR_DAT1_END_OF_TABL)
+ break;
+
+ alrport = (dat1 & ALR_DAT1_PORT_MASK) >> ALR_DAT1_PORT_BITOFFS;
+ portmap = alrport_2_portmap[alrport];
+
+ cb(chip, dat0, dat1, portmap, ctx);
+
+ lan9303_write_switch_reg(
+ chip, LAN9303_SWE_ALR_CMD, ALR_CMD_GET_NEXT);
+ lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
+ }
+}
+
+/* ALR: lan9303_alr_loop callback functions */
+
+static void alr_reg_to_mac(u32 dat0, u32 dat1, u8 mac[6])
+{
+ mac[0] = (dat0 >> 0) & 0xff;
+ mac[1] = (dat0 >> 8) & 0xff;
+ mac[2] = (dat0 >> 16) & 0xff;
+ mac[3] = (dat0 >> 24) & 0xff;
+ mac[4] = (dat1 >> 0) & 0xff;
+ mac[5] = (dat1 >> 8) & 0xff;
+}
+
+/* Clear learned (non-static) entry on given port */
+static void alr_loop_cb_del_port_learned(struct lan9303 *chip, u32 dat0,
+ u32 dat1, int portmap, void *ctx)
+{
+ int *port = ctx;
+
+ if (((BIT(*port) & portmap) == 0) || (dat1 & ALR_DAT1_STATIC))
+ return;
+
+ /* learned entries has only one port, we can just delete */
+ dat1 &= ~ALR_DAT1_VALID; /* delete entry */
+ lan9303_alr_make_entry_raw(chip, dat0, dat1);
+}
+
+struct port_fdb_dump_ctx {
+ int port;
+ void *data;
+ dsa_fdb_dump_cb_t *cb;
+};
+
+static void alr_loop_cb_fdb_port_dump(struct lan9303 *chip, u32 dat0,
+ u32 dat1, int portmap, void *ctx)
+{
+ struct port_fdb_dump_ctx *dump_ctx = ctx;
+ u8 mac[ETH_ALEN];
+ bool is_static;
+
+ if ((BIT(dump_ctx->port) & portmap) == 0)
+ return;
+
+ alr_reg_to_mac(dat0, dat1, mac);
+ is_static = !!(dat1 & ALR_DAT1_STATIC);
+ dump_ctx->cb(mac, 0, is_static, dump_ctx->data);
+}
+
+/* --------------------- Various chip setup ----------------------*/
+
static int lan9303_disable_processing_port(struct lan9303 *chip,
unsigned int port)
{
@@ -923,6 +1057,29 @@ static void lan9303_port_stp_state_set(struct dsa_switch *ds, int port,
/* else: touching SWE_PORT_STATE would break port separation */
}

+static void lan9303_port_fast_age(struct dsa_switch *ds, int port)
+{
+ struct lan9303 *chip = ds->priv;
+
+ dev_dbg(chip->dev, "%s(%d)\n", __func__, port);
+ lan9303_alr_loop(chip, alr_loop_cb_del_port_learned, &port);
+}
+
+static int lan9303_port_fdb_dump(struct dsa_switch *ds, int port,
+ dsa_fdb_dump_cb_t *cb, void *data)
+{
+ struct lan9303 *chip = ds->priv;
+ struct port_fdb_dump_ctx dump_ctx = {
+ .port = port,
+ .data = data,
+ .cb = cb,
+ };
+
+ dev_dbg(chip->dev, "%s(%d)\n", __func__, port);
+ lan9303_alr_loop(chip, alr_loop_cb_fdb_port_dump, &dump_ctx);
+ return 0;
+}
+
static const struct dsa_switch_ops lan9303_switch_ops = {
.get_tag_protocol = lan9303_get_tag_protocol,
.setup = lan9303_setup,
@@ -937,6 +1094,8 @@ static const struct dsa_switch_ops lan9303_switch_ops = {
.port_bridge_join = lan9303_port_bridge_join,
.port_bridge_leave = lan9303_port_bridge_leave,
.port_stp_state_set = lan9303_port_stp_state_set,
+ .port_fast_age = lan9303_port_fast_age,
+ .port_fdb_dump = lan9303_port_fdb_dump,
};

static int lan9303_register_switch(struct lan9303 *chip)
diff --git a/drivers/net/dsa/lan9303.h b/drivers/net/dsa/lan9303.h
index 68ecd544b658..4db323d65741 100644
--- a/drivers/net/dsa/lan9303.h
+++ b/drivers/net/dsa/lan9303.h
@@ -11,6 +11,8 @@ struct lan9303_phy_ops {
int regnum, u16 val);
};

+#define LAN9303_NUM_ALR_RECORDS 512
+
struct lan9303 {
struct device *dev;
struct regmap *regmap;
--
2.11.0