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path: root/drivers/net/dsa/qca8k.c
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Diffstat (limited to 'drivers/net/dsa/qca8k.c')
-rw-r--r--drivers/net/dsa/qca8k.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 2727d3169c25..1cbb05b0323f 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -2334,6 +2334,7 @@ static int
qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
{
struct qca8k_priv *priv = ds->priv;
+ int ret;
/* We have only have a general MTU setting.
* DSA always set the CPU port's MTU to the largest MTU of the slave
@@ -2344,8 +2345,27 @@ qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
if (!dsa_is_cpu_port(ds, port))
return 0;
+ /* To change the MAX_FRAME_SIZE the cpu ports must be off or
+ * the switch panics.
+ * Turn off both cpu ports before applying the new value to prevent
+ * this.
+ */
+ if (priv->port_enabled_map & BIT(0))
+ qca8k_port_set_status(priv, 0, 0);
+
+ if (priv->port_enabled_map & BIT(6))
+ qca8k_port_set_status(priv, 6, 0);
+
/* Include L2 header / FCS length */
- return qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, new_mtu + ETH_HLEN + ETH_FCS_LEN);
+ ret = qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, new_mtu + ETH_HLEN + ETH_FCS_LEN);
+
+ if (priv->port_enabled_map & BIT(0))
+ qca8k_port_set_status(priv, 0, 1);
+
+ if (priv->port_enabled_map & BIT(6))
+ qca8k_port_set_status(priv, 6, 1);
+
+ return ret;
}
static int