net: dsa: qca8k: reset cpu port on MTU change

BugLink: https://bugs.launchpad.net/bugs/1987451
commit 386228c694bf1e7a7688e44412cb33500b0ac585 upstream.

It was discovered that the Documentation lacks of a fundamental detail
on how to correctly change the MAX_FRAME_SIZE of the switch.

In fact if the MAX_FRAME_SIZE is changed while the cpu port is on, the
switch panics and cease to send any packet. This cause the mgmt ethernet
system to not receive any packet (the slow fallback still works) and
makes the device not reachable. To recover from this a switch reset is
required.

To correctly handle this, turn off the cpu ports before changing the
MAX_FRAME_SIZE and turn on again after the value is applied.

Fixes: f58d2598cf70 ("net: dsa: qca8k: implement the port MTU callbacks")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20220621151122.10220-1-ansuelsmth@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index a984f06f6f04f36b733ca912d52935b54089f4a2..67869c8cbeaa807df858f4c28ab03ebd9cd4ca8d 100644 (file)
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1599,7 +1599,7 @@ static int
 qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
 {
        struct qca8k_priv *priv = ds->priv;
-       int i, mtu = 0;
+       int ret, i, mtu = 0;
 
        priv->port_mtu[port] = new_mtu;
 
@@ -1607,8 +1607,27 @@ qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
                if (priv->port_mtu[i] > mtu)
                        mtu = priv->port_mtu[i];
 
+       /* 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_sts[0].enabled)
+               qca8k_port_set_status(priv, 0, 0);
+
+       if (priv->port_sts[6].enabled)
+               qca8k_port_set_status(priv, 6, 0);
+
        /* Include L2 header / FCS length */
-       return qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN);
+       ret = qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN);
+
+       if (priv->port_sts[0].enabled)
+               qca8k_port_set_status(priv, 0, 1);
+
+       if (priv->port_sts[6].enabled)
+               qca8k_port_set_status(priv, 6, 1);
+
+       return ret;
 }
 
 static int