This is a note to let you know that I've just added the patch titled net: dsa: qca8k: reset cpu port on MTU change to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-dsa-qca8k-reset-cpu-port-on-mtu-change.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 386228c694bf1e7a7688e44412cb33500b0ac585 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth@xxxxxxxxx> Date: Tue, 21 Jun 2022 17:11:22 +0200 Subject: net: dsa: qca8k: reset cpu port on MTU change From: Christian Marangi <ansuelsmth@xxxxxxxxx> 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@xxxxxxxxxxxxxxx Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx> Link: https://lore.kernel.org/r/20220621151122.10220-1-ansuelsmth@xxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/dsa/qca8k.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) --- 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 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 Patches currently in stable-queue which might be from ansuelsmth@xxxxxxxxx are queue-5.15/net-dsa-qca8k-reset-cpu-port-on-mtu-change.patch