net: dsa: bcm_sf2: Implement FDB operations

Add support for the FDB add, delete, and dump operations. The add and
delete operations are implemented using directed ARL operations using
the specified MAC address and consist in a read operation, write and
readback operation.

The dump operation consists in using the ARL search and software
filtering entries which are not for the desired port.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 236 insertions, 0 deletions

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 9d56515f4c4d..4f32b8a530bf 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -25,6 +25,8 @@
 #include <linux/ethtool.h>
 #include <linux/if_bridge.h>
 #include <linux/brcmphy.h>
+#include <linux/etherdevice.h>
+#include <net/switchdev.h>
 
 #include "bcm_sf2.h"
 #include "bcm_sf2_regs.h"
@@ -555,6 +557,236 @@ static int bcm_sf2_sw_br_set_stp_state(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+/* Address Resolution Logic routines */
+static int bcm_sf2_arl_op_wait(struct bcm_sf2_priv *priv)
+{
+	unsigned int timeout = 10;
+	u32 reg;
+
+	do {
+		reg = core_readl(priv, CORE_ARLA_RWCTL);
+		if (!(reg & ARL_STRTDN))
+			return 0;
+
+		usleep_range(1000, 2000);
+	} while (timeout--);
+
+	return -ETIMEDOUT;
+}
+
+static int bcm_sf2_arl_rw_op(struct bcm_sf2_priv *priv, unsigned int op)
+{
+	u32 cmd;
+
+	if (op > ARL_RW)
+		return -EINVAL;
+
+	cmd = core_readl(priv, CORE_ARLA_RWCTL);
+	cmd &= ~IVL_SVL_SELECT;
+	cmd |= ARL_STRTDN;
+	if (op)
+		cmd |= ARL_RW;
+	else
+		cmd &= ~ARL_RW;
+	core_writel(priv, cmd, CORE_ARLA_RWCTL);
+
+	return bcm_sf2_arl_op_wait(priv);
+}
+
+static int bcm_sf2_arl_read(struct bcm_sf2_priv *priv, u64 mac,
+			    u16 vid, struct bcm_sf2_arl_entry *ent, u8 *idx,
+			    bool is_valid)
+{
+	unsigned int i;
+	int ret;
+
+	ret = bcm_sf2_arl_op_wait(priv);
+	if (ret)
+		return ret;
+
+	/* Read the 4 bins */
+	for (i = 0; i < 4; i++) {
+		u64 mac_vid;
+		u32 fwd_entry;
+
+		mac_vid = core_readq(priv, CORE_ARLA_MACVID_ENTRY(i));
+		fwd_entry = core_readl(priv, CORE_ARLA_FWD_ENTRY(i));
+		bcm_sf2_arl_to_entry(ent, mac_vid, fwd_entry);
+
+		if (ent->is_valid && is_valid) {
+			*idx = i;
+			return 0;
+		}
+
+		/* This is the MAC we just deleted */
+		if (!is_valid && (mac_vid & mac))
+			return 0;
+	}
+
+	return -ENOENT;
+}
+
+static int bcm_sf2_arl_op(struct bcm_sf2_priv *priv, int op, int port,
+			  const unsigned char *addr, u16 vid, bool is_valid)
+{
+	struct bcm_sf2_arl_entry ent;
+	u32 fwd_entry;
+	u64 mac, mac_vid = 0;
+	u8 idx = 0;
+	int ret;
+
+	/* Convert the array into a 64-bit MAC */
+	mac = bcm_sf2_mac_to_u64(addr);
+
+	/* Perform a read for the given MAC and VID */
+	core_writeq(priv, mac, CORE_ARLA_MAC);
+	core_writel(priv, vid, CORE_ARLA_VID);
+
+	/* Issue a read operation for this MAC */
+	ret = bcm_sf2_arl_rw_op(priv, 1);
+	if (ret)
+		return ret;
+
+	ret = bcm_sf2_arl_read(priv, mac, vid, &ent, &idx, is_valid);
+	/* If this is a read, just finish now */
+	if (op)
+		return ret;
+
+	/* We could not find a matching MAC, so reset to a new entry */
+	if (ret) {
+		fwd_entry = 0;
+		idx = 0;
+	}
+
+	memset(&ent, 0, sizeof(ent));
+	ent.port = port;
+	ent.is_valid = is_valid;
+	ent.vid = vid;
+	ent.is_static = true;
+	memcpy(ent.mac, addr, ETH_ALEN);
+	bcm_sf2_arl_from_entry(&mac_vid, &fwd_entry, &ent);
+
+	core_writeq(priv, mac_vid, CORE_ARLA_MACVID_ENTRY(idx));
+	core_writel(priv, fwd_entry, CORE_ARLA_FWD_ENTRY(idx));
+
+	ret = bcm_sf2_arl_rw_op(priv, 0);
+	if (ret)
+		return ret;
+
+	/* Re-read the entry to check */
+	return bcm_sf2_arl_read(priv, mac, vid, &ent, &idx, is_valid);
+}
+
+static int bcm_sf2_sw_fdb_prepare(struct dsa_switch *ds, int port,
+				  const struct switchdev_obj_port_fdb *fdb,
+				  struct switchdev_trans *trans)
+{
+	/* We do not need to do anything specific here yet */
+	return 0;
+}
+
+static int bcm_sf2_sw_fdb_add(struct dsa_switch *ds, int port,
+			      const struct switchdev_obj_port_fdb *fdb,
+			      struct switchdev_trans *trans)
+{
+	struct bcm_sf2_priv *priv = ds_to_priv(ds);
+
+	return bcm_sf2_arl_op(priv, 0, port, fdb->addr, fdb->vid, true);
+}
+
+static int bcm_sf2_sw_fdb_del(struct dsa_switch *ds, int port,
+			      const struct switchdev_obj_port_fdb *fdb)
+{
+	struct bcm_sf2_priv *priv = ds_to_priv(ds);
+
+	return bcm_sf2_arl_op(priv, 0, port, fdb->addr, fdb->vid, false);
+}
+
+static int bcm_sf2_arl_search_wait(struct bcm_sf2_priv *priv)
+{
+	unsigned timeout = 1000;
+	u32 reg;
+
+	do {
+		reg = core_readl(priv, CORE_ARLA_SRCH_CTL);
+		if (!(reg & ARLA_SRCH_STDN))
+			return 0;
+
+		if (reg & ARLA_SRCH_VLID)
+			return 0;
+
+		usleep_range(1000, 2000);
+	} while (timeout--);
+
+	return -ETIMEDOUT;
+}
+
+static void bcm_sf2_arl_search_rd(struct bcm_sf2_priv *priv, u8 idx,
+				  struct bcm_sf2_arl_entry *ent)
+{
+	u64 mac_vid;
+	u32 fwd_entry;
+
+	mac_vid = core_readq(priv, CORE_ARLA_SRCH_RSLT_MACVID(idx));
+	fwd_entry = core_readl(priv, CORE_ARLA_SRCH_RSLT(idx));
+	bcm_sf2_arl_to_entry(ent, mac_vid, fwd_entry);
+}
+
+static int bcm_sf2_sw_fdb_copy(struct net_device *dev, int port,
+			       const struct bcm_sf2_arl_entry *ent,
+			       struct switchdev_obj_port_fdb *fdb,
+			       int (*cb)(struct switchdev_obj *obj))
+{
+	if (!ent->is_valid)
+		return 0;
+
+	if (port != ent->port)
+		return 0;
+
+	ether_addr_copy(fdb->addr, ent->mac);
+	fdb->vid = ent->vid;
+	fdb->ndm_state = ent->is_static ? NUD_NOARP : NUD_REACHABLE;
+
+	return cb(&fdb->obj);
+}
+
+static int bcm_sf2_sw_fdb_dump(struct dsa_switch *ds, int port,
+			       struct switchdev_obj_port_fdb *fdb,
+			       int (*cb)(struct switchdev_obj *obj))
+{
+	struct bcm_sf2_priv *priv = ds_to_priv(ds);
+	struct net_device *dev = ds->ports[port];
+	struct bcm_sf2_arl_entry results[2];
+	unsigned int count = 0;
+	int ret;
+
+	/* Start search operation */
+	core_writel(priv, ARLA_SRCH_STDN, CORE_ARLA_SRCH_CTL);
+
+	do {
+		ret = bcm_sf2_arl_search_wait(priv);
+		if (ret)
+			return ret;
+
+		/* Read both entries, then return their values back */
+		bcm_sf2_arl_search_rd(priv, 0, &results[0]);
+		ret = bcm_sf2_sw_fdb_copy(dev, port, &results[0], fdb, cb);
+		if (ret)
+			return ret;
+
+		bcm_sf2_arl_search_rd(priv, 1, &results[1]);
+		ret = bcm_sf2_sw_fdb_copy(dev, port, &results[1], fdb, cb);
+		if (ret)
+			return ret;
+
+		if (!results[0].is_valid && !results[1].is_valid)
+			break;
+
+	} while (count++ < CORE_ARLA_NUM_ENTRIES);
+
+	return 0;
+}
+
 static irqreturn_t bcm_sf2_switch_0_isr(int irq, void *dev_id)
 {
 	struct bcm_sf2_priv *priv = dev_id;
@@ -1076,6 +1308,10 @@ static struct dsa_switch_driver bcm_sf2_switch_driver = {
 	.port_join_bridge	= bcm_sf2_sw_br_join,
 	.port_leave_bridge	= bcm_sf2_sw_br_leave,
 	.port_stp_update	= bcm_sf2_sw_br_set_stp_state,
+	.port_fdb_prepare	= bcm_sf2_sw_fdb_prepare,
+	.port_fdb_add		= bcm_sf2_sw_fdb_add,
+	.port_fdb_del		= bcm_sf2_sw_fdb_del,
+	.port_fdb_dump		= bcm_sf2_sw_fdb_dump,
 };
 
 static int __init bcm_sf2_init(void)