[net-next PATCH v2 13/15] net: dsa: qca8k: move port LAG functions to common code

Christian Marangi
2022-07-19T01:16:31Z

The same port LAG functions are used by drivers based on qca8k family
switch. Move them to common code to make them accessible also by other
drivers.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/net/dsa/qca/qca8k-8xxx.c | 168 -----------------------------
drivers/net/dsa/qca/qca8k-common.c | 168 +++++++++++++++++++++++++++++
drivers/net/dsa/qca/qca8k.h | 6 ++
3 files changed, 174 insertions(+), 168 deletions(-)

diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index d6223ee79389..dfd5cd0817f9 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -1598,174 +1598,6 @@ qca8k_get_tag_protocol(struct dsa_switch *ds, int port,
return DSA_TAG_PROTO_QCA;
}

-static bool
-qca8k_lag_can_offload(struct dsa_switch *ds, struct dsa_lag lag,
- struct netdev_lag_upper_info *info)
-{
- struct dsa_port *dp;
- int members = 0;
-
- if (!lag.id)
- return false;
-
- dsa_lag_foreach_port(dp, ds->dst, &lag)
- /* Includes the port joining the LAG */
- members++;
-
- if (members > QCA8K_NUM_PORTS_FOR_LAG)
- return false;
-
- if (info->tx_type != NETDEV_LAG_TX_TYPE_HASH)
- return false;
-
- if (info->hash_type != NETDEV_LAG_HASH_L2 &&
- info->hash_type != NETDEV_LAG_HASH_L23)
- return false;
-
- return true;
-}
-
-static int
-qca8k_lag_setup_hash(struct dsa_switch *ds, struct dsa_lag lag,
- struct netdev_lag_upper_info *info)
-{
- struct net_device *lag_dev = lag.dev;
- struct qca8k_priv *priv = ds->priv;
- bool unique_lag = true;
- unsigned int i;
- u32 hash = 0;
-
- switch (info->hash_type) {
- case NETDEV_LAG_HASH_L23:
- hash |= QCA8K_TRUNK_HASH_SIP_EN;
- hash |= QCA8K_TRUNK_HASH_DIP_EN;
- fallthrough;
- case NETDEV_LAG_HASH_L2:
- hash |= QCA8K_TRUNK_HASH_SA_EN;
- hash |= QCA8K_TRUNK_HASH_DA_EN;
- break;
- default: /* We should NEVER reach this */
- return -EOPNOTSUPP;
- }
-
- /* Check if we are the unique configured LAG */
- dsa_lags_foreach_id(i, ds->dst)
- if (i != lag.id && dsa_lag_by_id(ds->dst, i)) {
- unique_lag = false;
- break;
- }
-
- /* Hash Mode is global. Make sure the same Hash Mode
- * is set to all the 4 possible lag.
- * If we are the unique LAG we can set whatever hash
- * mode we want.
- * To change hash mode it's needed to remove all LAG
- * and change the mode with the latest.
- */
- if (unique_lag) {
- priv->lag_hash_mode = hash;
- } else if (priv->lag_hash_mode != hash) {
- netdev_err(lag_dev, "Error: Mismatched Hash Mode across different lag is not supported\n");
- return -EOPNOTSUPP;
- }
-
- return regmap_update_bits(priv->regmap, QCA8K_TRUNK_HASH_EN_CTRL,
- QCA8K_TRUNK_HASH_MASK, hash);
-}
-
-static int
-qca8k_lag_refresh_portmap(struct dsa_switch *ds, int port,
- struct dsa_lag lag, bool delete)
-{
- struct qca8k_priv *priv = ds->priv;
- int ret, id, i;
- u32 val;
-
- /* DSA LAG IDs are one-based, hardware is zero-based */
- id = lag.id - 1;
-
- /* Read current port member */
- ret = regmap_read(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL0, &val);
- if (ret)
- return ret;
-
- /* Shift val to the correct trunk */
- val >>= QCA8K_REG_GOL_TRUNK_SHIFT(id);
- val &= QCA8K_REG_GOL_TRUNK_MEMBER_MASK;
- if (delete)
- val &= ~BIT(port);
- else
- val |= BIT(port);
-
- /* Update port member. With empty portmap disable trunk */
- ret = regmap_update_bits(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL0,
- QCA8K_REG_GOL_TRUNK_MEMBER(id) |
- QCA8K_REG_GOL_TRUNK_EN(id),
- !val << QCA8K_REG_GOL_TRUNK_SHIFT(id) |
- val << QCA8K_REG_GOL_TRUNK_SHIFT(id));
-
- /* Search empty member if adding or port on deleting */
- for (i = 0; i < QCA8K_NUM_PORTS_FOR_LAG; i++) {
- ret = regmap_read(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL(id), &val);
- if (ret)
- return ret;
-
- val >>= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i);
- val &= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_MASK;
-
- if (delete) {
- /* If port flagged to be disabled assume this member is
- * empty
- */
- if (val != QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN_MASK)
- continue;
-
- val &= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_PORT_MASK;
- if (val != port)
- continue;
- } else {
- /* If port flagged to be enabled assume this member is
- * already set
- */
- if (val == QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN_MASK)
- continue;
- }
-
- /* We have found the member to add/remove */
- break;
- }
-
- /* Set port in the correct port mask or disable port if in delete mode */
- return regmap_update_bits(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL(id),
- QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN(id, i) |
- QCA8K_REG_GOL_TRUNK_ID_MEM_ID_PORT(id, i),
- !delete << QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i) |
- port << QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i));
-}
-
-static int
-qca8k_port_lag_join(struct dsa_switch *ds, int port, struct dsa_lag lag,
- struct netdev_lag_upper_info *info)
-{
- int ret;
-
- if (!qca8k_lag_can_offload(ds, lag, info))
- return -EOPNOTSUPP;
-
- ret = qca8k_lag_setup_hash(ds, lag, info);
- if (ret)
- return ret;
-
- return qca8k_lag_refresh_portmap(ds, port, lag, false);
-}
-
-static int
-qca8k_port_lag_leave(struct dsa_switch *ds, int port,
- struct dsa_lag lag)
-{
- return qca8k_lag_refresh_portmap(ds, port, lag, true);
-}
-
static void
qca8k_master_change(struct dsa_switch *ds, const struct net_device *master,
bool operational)
diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
index 11af3b09ae81..f8a3b08a6257 100644
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -1056,3 +1056,171 @@ qca8k_port_vlan_del(struct dsa_switch *ds, int port,

return ret;
}
+
+static bool
+qca8k_lag_can_offload(struct dsa_switch *ds, struct dsa_lag lag,
+ struct netdev_lag_upper_info *info)
+{
+ struct dsa_port *dp;
+ int members = 0;
+
+ if (!lag.id)
+ return false;
+
+ dsa_lag_foreach_port(dp, ds->dst, &lag)
+ /* Includes the port joining the LAG */
+ members++;
+
+ if (members > QCA8K_NUM_PORTS_FOR_LAG)
+ return false;
+
+ if (info->tx_type != NETDEV_LAG_TX_TYPE_HASH)
+ return false;
+
+ if (info->hash_type != NETDEV_LAG_HASH_L2 &&
+ info->hash_type != NETDEV_LAG_HASH_L23)
+ return false;
+
+ return true;
+}
+
+static int
+qca8k_lag_setup_hash(struct dsa_switch *ds, struct dsa_lag lag,
+ struct netdev_lag_upper_info *info)
+{
+ struct net_device *lag_dev = lag.dev;
+ struct qca8k_priv *priv = ds->priv;
+ bool unique_lag = true;
+ unsigned int i;
+ u32 hash = 0;
+
+ switch (info->hash_type) {
+ case NETDEV_LAG_HASH_L23:
+ hash |= QCA8K_TRUNK_HASH_SIP_EN;
+ hash |= QCA8K_TRUNK_HASH_DIP_EN;
+ fallthrough;
+ case NETDEV_LAG_HASH_L2:
+ hash |= QCA8K_TRUNK_HASH_SA_EN;
+ hash |= QCA8K_TRUNK_HASH_DA_EN;
+ break;
+ default: /* We should NEVER reach this */
+ return -EOPNOTSUPP;
+ }
+
+ /* Check if we are the unique configured LAG */
+ dsa_lags_foreach_id(i, ds->dst)
+ if (i != lag.id && dsa_lag_by_id(ds->dst, i)) {
+ unique_lag = false;
+ break;
+ }
+
+ /* Hash Mode is global. Make sure the same Hash Mode
+ * is set to all the 4 possible lag.
+ * If we are the unique LAG we can set whatever hash
+ * mode we want.
+ * To change hash mode it's needed to remove all LAG
+ * and change the mode with the latest.
+ */
+ if (unique_lag) {
+ priv->lag_hash_mode = hash;
+ } else if (priv->lag_hash_mode != hash) {
+ netdev_err(lag_dev, "Error: Mismatched Hash Mode across different lag is not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ return regmap_update_bits(priv->regmap, QCA8K_TRUNK_HASH_EN_CTRL,
+ QCA8K_TRUNK_HASH_MASK, hash);
+}
+
+static int
+qca8k_lag_refresh_portmap(struct dsa_switch *ds, int port,
+ struct dsa_lag lag, bool delete)
+{
+ struct qca8k_priv *priv = ds->priv;
+ int ret, id, i;
+ u32 val;
+
+ /* DSA LAG IDs are one-based, hardware is zero-based */
+ id = lag.id - 1;
+
+ /* Read current port member */
+ ret = regmap_read(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL0, &val);
+ if (ret)
+ return ret;
+
+ /* Shift val to the correct trunk */
+ val >>= QCA8K_REG_GOL_TRUNK_SHIFT(id);
+ val &= QCA8K_REG_GOL_TRUNK_MEMBER_MASK;
+ if (delete)
+ val &= ~BIT(port);
+ else
+ val |= BIT(port);
+
+ /* Update port member. With empty portmap disable trunk */
+ ret = regmap_update_bits(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL0,
+ QCA8K_REG_GOL_TRUNK_MEMBER(id) |
+ QCA8K_REG_GOL_TRUNK_EN(id),
+ !val << QCA8K_REG_GOL_TRUNK_SHIFT(id) |
+ val << QCA8K_REG_GOL_TRUNK_SHIFT(id));
+
+ /* Search empty member if adding or port on deleting */
+ for (i = 0; i < QCA8K_NUM_PORTS_FOR_LAG; i++) {
+ ret = regmap_read(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL(id), &val);
+ if (ret)
+ return ret;
+
+ val >>= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i);
+ val &= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_MASK;
+
+ if (delete) {
+ /* If port flagged to be disabled assume this member is
+ * empty
+ */
+ if (val != QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN_MASK)
+ continue;
+
+ val &= QCA8K_REG_GOL_TRUNK_ID_MEM_ID_PORT_MASK;
+ if (val != port)
+ continue;
+ } else {
+ /* If port flagged to be enabled assume this member is
+ * already set
+ */
+ if (val == QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN_MASK)
+ continue;
+ }
+
+ /* We have found the member to add/remove */
+ break;
+ }
+
+ /* Set port in the correct port mask or disable port if in delete mode */
+ return regmap_update_bits(priv->regmap, QCA8K_REG_GOL_TRUNK_CTRL(id),
+ QCA8K_REG_GOL_TRUNK_ID_MEM_ID_EN(id, i) |
+ QCA8K_REG_GOL_TRUNK_ID_MEM_ID_PORT(id, i),
+ !delete << QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i) |
+ port << QCA8K_REG_GOL_TRUNK_ID_MEM_ID_SHIFT(id, i));
+}
+
+int
+qca8k_port_lag_join(struct dsa_switch *ds, int port, struct dsa_lag lag,
+ struct netdev_lag_upper_info *info)
+{
+ int ret;
+
+ if (!qca8k_lag_can_offload(ds, lag, info))
+ return -EOPNOTSUPP;
+
+ ret = qca8k_lag_setup_hash(ds, lag, info);
+ if (ret)
+ return ret;
+
+ return qca8k_lag_refresh_portmap(ds, port, lag, false);
+}
+
+int
+qca8k_port_lag_leave(struct dsa_switch *ds, int port,
+ struct dsa_lag lag)
+{
+ return qca8k_lag_refresh_portmap(ds, port, lag, true);
+}
diff --git a/drivers/net/dsa/qca/qca8k.h b/drivers/net/dsa/qca/qca8k.h
index aa4fe02a2155..3ee069cb4fd2 100644
--- a/drivers/net/dsa/qca/qca8k.h
+++ b/drivers/net/dsa/qca/qca8k.h
@@ -518,4 +518,10 @@ int qca8k_port_vlan_add(struct dsa_switch *ds, int port,
int qca8k_port_vlan_del(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan);

+/* Common port LAG function */
+int qca8k_port_lag_join(struct dsa_switch *ds, int port, struct dsa_lag lag,
+ struct netdev_lag_upper_info *info);
+int qca8k_port_lag_leave(struct dsa_switch *ds, int port,
+ struct dsa_lag lag);
+
#endif /* __QCA8K_H */
--
2.36.1