The patch below does not apply to the 6.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.5.y git checkout FETCH_HEAD git cherry-pick -x 95201f36f395df34321fcddbce12103e8bbe4970 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023102751-playful-marbled-4744@gregkh' --subject-prefix 'PATCH 6.5.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 95201f36f395df34321fcddbce12103e8bbe4970 Mon Sep 17 00:00:00 2001 From: Michael Sit Wei Hong michael.wei.hong.sit@intel.com Date: Fri, 20 Oct 2023 11:25:35 +0800 Subject: [PATCH] net: stmmac: update MAC capabilities when tx queues are updated

Upon boot up, the driver will configure the MAC capabilities based on the maximum number of tx and rx queues. When the user changes the tx queues to single queue, the MAC should be capable of supporting Half Duplex, but the driver does not update the MAC capabilities when it is configured so.

Using the stmmac_reinit_queues() to check the number of tx queues and set the MAC capabilities accordingly.

Fixes: 0366f7e06a6b ("net: stmmac: add ethtool support for get/set channels") Cc: stable@vger.kernel.org # 5.17+ Signed-off-by: Michael Sit Wei Hong michael.wei.hong.sit@intel.com Signed-off-by: Gan, Yi Fang yi.fang.gan@intel.com Signed-off-by: David S. Miller davem@davemloft.net

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index ed1a5a31a491..5801f4d50f95 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -1197,6 +1197,17 @@ static int stmmac_init_phy(struct net_device *dev) return ret; }

+static void stmmac_set_half_duplex(struct stmmac_priv *priv) +{ + /* Half-Duplex can only work with single tx queue */ + if (priv->plat->tx_queues_to_use > 1) + priv->phylink_config.mac_capabilities &= + ~(MAC_10HD | MAC_100HD | MAC_1000HD); + else + priv->phylink_config.mac_capabilities |= + (MAC_10HD | MAC_100HD | MAC_1000HD); +} + static int stmmac_phy_setup(struct stmmac_priv *priv) { struct stmmac_mdio_bus_data *mdio_bus_data; @@ -1228,10 +1239,7 @@ static int stmmac_phy_setup(struct stmmac_priv *priv) MAC_10FD | MAC_100FD | MAC_1000FD;

- /* Half-Duplex can only work with single queue */ - if (priv->plat->tx_queues_to_use <= 1) - priv->phylink_config.mac_capabilities |= MAC_10HD | MAC_100HD | - MAC_1000HD; + stmmac_set_half_duplex(priv);

/* Get the MAC specific capabilities */ stmmac_mac_phylink_get_caps(priv); @@ -7172,6 +7180,7 @@ int stmmac_reinit_queues(struct net_device *dev, u32 rx_cnt, u32 tx_cnt) priv->rss.table[i] = ethtool_rxfh_indir_default(i, rx_cnt);

+ stmmac_set_half_duplex(priv); stmmac_napi_add(dev);

if (netif_running(dev))