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Date: Fri, 20 Feb 2015 11:51:13 +0100
From: Jonas Johansson <jonasj76@...il.com>
To: netdev@...r.kernel.org
Cc: Jonas Johansson <jonas.johansson@...termo.se>
Subject: [PATCH net-next 2/2] mv88e6131: bonding: implement single device trunking
From: Jonas Johansson <jonas.johansson@...termo.se>
This patch will use the DSA hardware bonding support hooks to setup trunking
for the Marvell 88E6095 device. The implementation only handles trunking in
a single device.
Hooks:
.bond_add_group: Add port to a bond group
.bond_del_group: Remove port from a bond group
.bond_attach: Attach/activate port in bond group
.bond_detach: Detach/inactivate port in bond group
Procedure to add/remome port from bond group:
Setup trunk learning (Port Association Vector)
Setup loop prevention (VLAN Table)
Setup load balancing (Trunk Mask Load Balance Table)
Procedure to attach/detach port:
Change load balancing (Trunk Mask Load Balance Table)
Signed-off-by: Jonas Johansson <jonas.johansson@...termo.se>
---
drivers/net/dsa/mv88e6131.c | 254 ++++++++++++++++++++++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx.h | 14 +++
2 files changed, 268 insertions(+)
diff --git a/drivers/net/dsa/mv88e6131.c b/drivers/net/dsa/mv88e6131.c
index 2540ef0..3ba7a0c 100644
--- a/drivers/net/dsa/mv88e6131.c
+++ b/drivers/net/dsa/mv88e6131.c
@@ -382,6 +382,256 @@ mv88e6131_get_ethtool_stats(struct dsa_switch *ds,
mv88e6131_hw_stats, port, data);
}
+/* Trunking */
+static int mv88e6131_bond_set_trunk_learning(struct dsa_switch *ds,
+ int *ports, size_t num)
+{
+ u16 port_vec = 0;
+ int ret;
+ int i;
+
+ num = num < MAX_PORTS ? num : MAX_PORTS;
+
+ for (i = 0; i < num; i++)
+ port_vec |= 1 << ports[i];
+
+ for (i = 0; i < num; i++) {
+ ret = mv88e6xxx_reg_read(ds, REG_PORT(ports[i]), REG_PORT_PAV);
+ if (ret < 0)
+ continue;
+ ret = (ret & 0xf800) | (port_vec & 0x7ff);
+ mv88e6xxx_reg_write(ds, REG_PORT(ports[i]), REG_PORT_PAV, ret);
+ }
+
+ return 0;
+}
+
+static int mv88e6131_bond_set_loop_prevention(struct dsa_switch *ds,
+ int *ports, size_t num)
+{
+ u16 port_vec = 0;
+ int ret;
+ int i;
+
+ num = num < MAX_PORTS ? num : MAX_PORTS;
+
+ for (i = 0; i < num; i++)
+ port_vec |= 1 << ports[i];
+
+ for (i = 0; i < num; i++) {
+ ret = mv88e6xxx_reg_read(ds, REG_PORT(ports[i]), REG_PORT_VLAN_MAP);
+ if (ret < 0)
+ continue;
+ ret &= ~port_vec & 0x7ff;
+ mv88e6xxx_reg_write(ds, REG_PORT(ports[i]), REG_PORT_VLAN_MAP, ret);
+ }
+
+ return 0;
+}
+
+static int mv88e6131_wait_trunk_mask(struct dsa_switch *ds)
+{
+ const int max_retries = 10;
+ int retries = 0;
+ int ret;
+
+ /* Wait for update Trunk Mask data */
+ while (1) {
+ ret = REG_READ(REG_GLOBAL2, REG_TRUNK_MASK);
+ if (!(ret & 0x8000))
+ return ret;
+ if (retries > max_retries) {
+ pr_warn("mv88e6131: Timeout waiting for "
+ "Trunk Mask Table Register Update\n");
+ return -EBUSY;
+ }
+ retries++;
+ usleep_range(20, 50);
+ };
+
+ return -EPERM;
+}
+
+static int mv88e6131_get_trunk_mask(struct dsa_switch *ds, int trunk_nr, u16 *mask)
+{
+ int ret;
+
+ if (trunk_nr > 0x7)
+ return -EINVAL;
+
+ ret = mv88e6131_wait_trunk_mask(ds);
+ if (ret < 0)
+ return ret;
+
+ /* Set MaskNum */
+ ret = (ret & 0x0fff) | (trunk_nr << 12);
+ REG_WRITE(REG_GLOBAL2, REG_TRUNK_MASK, ret);
+
+ /* Get TrunkMask */
+ ret = REG_READ(REG_GLOBAL2, REG_TRUNK_MASK);
+ *mask = ret & 0x7FF;
+
+ return 0;
+}
+
+static int mv88e6131_set_trunk_mask(struct dsa_switch *ds, int trunk_nr, u16 mask)
+{
+ int ret;
+
+ if (trunk_nr > 0x7)
+ return -EINVAL;
+
+ ret = mv88e6131_wait_trunk_mask(ds);
+ if (ret < 0)
+ return ret;
+
+ /* Write TrunkMask */
+ ret = 0x8000 | (ret & 0x7800) | (trunk_nr << 12) | (mask & 0x7ff);
+ REG_WRITE(REG_GLOBAL2, REG_TRUNK_MASK, ret);
+
+ return 0;
+}
+
+static int mv88e6131_bond_set_load_balancing(struct dsa_switch *ds,
+ int *ports, bool *attached, size_t num)
+{
+ u16 mask;
+ u16 member_mask = 0;
+ int att_ports[MAX_PORTS];
+ int att_num = 0;
+ int ret;
+ int i;
+
+ num = num < MAX_PORTS ? num : MAX_PORTS;
+
+ for (i = 0; i < num; i++) {
+ member_mask |= 1 << ports[i];
+ if (attached[i])
+ att_ports[att_num++] = ports[i];
+ }
+
+ for (i = 0; i < 8; i++) {
+ ret = mv88e6131_get_trunk_mask(ds, i, &mask);
+ if (ret < 0)
+ continue;
+ mask &= ~member_mask;
+ if (att_num)
+ mask |= 1 << att_ports[i % att_num];
+ mv88e6131_set_trunk_mask(ds, i, mask);
+ }
+
+ return 0;
+}
+
+static int mv88e6131_bond_get_ports(struct dsa_switch *ds, int gid, int *ports, bool *attached, size_t sz)
+{
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+ int num = 0;
+ int p;
+
+ for (p = 0; (p < MAX_PORTS) && (num < sz) ; p++) {
+ if (ps->bond_port[p].gid == gid) {
+ ports[num] = p;
+ attached[num] = ps->bond_port[p].attached;
+ num++;
+ }
+ }
+
+ return num;
+}
+
+static int mv88e6131_bond_setup(struct dsa_switch *ds, int gid)
+{
+ int ports[MAX_PORTS];
+ bool attached[MAX_PORTS];
+ int num;
+ int err = 0;
+
+ num = mv88e6131_bond_get_ports(ds, gid, ports, attached, MAX_PORTS);
+
+ err = mv88e6131_bond_set_trunk_learning(ds, ports, num);
+ if (err)
+ return err;
+ err = mv88e6131_bond_set_loop_prevention(ds, ports, num);
+ if (err)
+ return err;
+ err = mv88e6131_bond_set_load_balancing(ds, ports, attached, num);
+ if (err)
+ return err;
+
+ return 0;
+
+}
+
+static int mv88e6131_bond_add_group(struct dsa_switch *ds, int port, int gid)
+{
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+
+ ps->bond_port[port].gid = gid;
+ ps->bond_port[port].attached = false;
+
+ return mv88e6131_bond_setup(ds, gid);
+}
+
+static int mv88e6131_bond_del_group(struct dsa_switch *ds, int port, int gid)
+{
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+ bool btmp;
+ int ret;
+
+ ps->bond_port[port].gid = 0;
+ ps->bond_port[port].attached = false;
+ mv88e6131_bond_setup(ds, gid);
+
+ /* Reset trunk learning */
+ ret = mv88e6xxx_reg_read(ds, REG_PORT(port), REG_PORT_PAV);
+ if (ret >= 0) {
+ ret = (ret & 0xf800) | ((1 << port) & 0x7ff);
+ mv88e6xxx_reg_write(ds, REG_PORT(port), REG_PORT_PAV, ret);
+ }
+ /* Reset loop prevention */
+ ret = mv88e6xxx_reg_read(ds, REG_PORT(port), REG_PORT_VLAN_MAP);
+ if (ret >= 0) {
+ ret = (ret & 0xf800) | ((1 << dsa_upstream_port(ds)) & 0x7ff);
+ mv88e6xxx_reg_write(ds, REG_PORT(port), REG_PORT_VLAN_MAP, ret);
+ }
+ /* Reset load balancing */
+ btmp = true;
+ mv88e6131_bond_set_load_balancing(ds, &port, &btmp, 1);
+
+ return 0;
+}
+
+static int mv88e6131_bond_attach(struct dsa_switch *ds, int port)
+{
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+ int ports[MAX_PORTS];
+ bool attached[MAX_PORTS];
+ int gid = ps->bond_port[port].gid;
+ int num;
+
+ ps->bond_port[port].attached = true;
+ num = mv88e6131_bond_get_ports(ds, gid, ports, attached, MAX_PORTS);
+
+ return mv88e6131_bond_set_load_balancing(ds, ports, attached, num);
+}
+
+static int mv88e6131_bond_detach(struct dsa_switch *ds, int port)
+{
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+ int ports[MAX_PORTS];
+ bool attached[MAX_PORTS];
+ int gid = ps->bond_port[port].gid;
+ int num;
+
+ ps->bond_port[port].attached = false;
+ num = mv88e6131_bond_get_ports(ds, gid, ports, attached, MAX_PORTS);
+
+ return mv88e6131_bond_set_load_balancing(ds, ports, attached, num);
+}
+
+
+
static int mv88e6131_get_sset_count(struct dsa_switch *ds)
{
return ARRAY_SIZE(mv88e6131_hw_stats);
@@ -399,6 +649,10 @@ struct dsa_switch_driver mv88e6131_switch_driver = {
.get_strings = mv88e6131_get_strings,
.get_ethtool_stats = mv88e6131_get_ethtool_stats,
.get_sset_count = mv88e6131_get_sset_count,
+ .bond_add_group = mv88e6131_bond_add_group,
+ .bond_del_group = mv88e6131_bond_del_group,
+ .bond_attach = mv88e6131_bond_attach,
+ .bond_detach = mv88e6131_bond_detach,
};
MODULE_ALIAS("platform:mv88e6085");
diff --git a/drivers/net/dsa/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx.h
index 7294227..383b224 100644
--- a/drivers/net/dsa/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx.h
@@ -11,9 +11,19 @@
#ifndef __MV88E6XXX_H
#define __MV88E6XXX_H
+#define MAX_PORTS 11
+
#define REG_PORT(p) (0x10 + (p))
+#define REG_PORT_VLAN_MAP 0x6
+#define REG_PORT_PAV 0xb
#define REG_GLOBAL 0x1b
#define REG_GLOBAL2 0x1c
+#define REG_TRUNK_MASK 0x7
+
+struct mv88e6xxx_bond_port {
+ int gid;
+ bool attached;
+};
struct mv88e6xxx_priv_state {
/* When using multi-chip addressing, this mutex protects
@@ -49,6 +59,10 @@ struct mv88e6xxx_priv_state {
struct mutex eeprom_mutex;
int id; /* switch product id */
+
+ /* Contains bonding info for each port
+ */
+ struct mv88e6xxx_bond_port bond_port[MAX_PORTS];
};
struct mv88e6xxx_hw_stat {
--
2.1.0
--
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