This is a note to let you know that I've just added the patch titled netdevsim: don't overwrite read only ethtool parms 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: netdevsim-don-t-overwrite-read-only-ethtool-parms.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. commit 3b3e5815da2d6b526c6bbaf0d7172002fa78d27f Author: Filip Pokryvka <fpokryvk@xxxxxxxxxx> Date: Fri Dec 10 18:50:32 2021 +0100 netdevsim: don't overwrite read only ethtool parms [ Upstream commit ee60e626d536da4c710b3634afe68fe7c6d69b59 ] Ethtool ring feature has _max_pending attributes read-only. Set only read-write attributes in nsim_set_ringparam. This patch is useful, if netdevsim device is set-up using NetworkManager, because NetworkManager sends 0 as MAX values, as it is pointless to retrieve them in extra call, because they should be read-only. Then, the device is left in incosistent state (value > MAX). Fixes: a7fc6db099b5 ("netdevsim: support ethtool ring and coalesce settings") Signed-off-by: Filip Pokryvka <fpokryvk@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211210175032.411872-1-fpokryvk@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/netdevsim/ethtool.c b/drivers/net/netdevsim/ethtool.c index b03a0513eb7e7..2e7c1cc16cb93 100644 --- a/drivers/net/netdevsim/ethtool.c +++ b/drivers/net/netdevsim/ethtool.c @@ -77,7 +77,10 @@ static int nsim_set_ringparam(struct net_device *dev, { struct netdevsim *ns = netdev_priv(dev); - memcpy(&ns->ethtool.ring, ring, sizeof(ns->ethtool.ring)); + ns->ethtool.ring.rx_pending = ring->rx_pending; + ns->ethtool.ring.rx_jumbo_pending = ring->rx_jumbo_pending; + ns->ethtool.ring.rx_mini_pending = ring->rx_mini_pending; + ns->ethtool.ring.tx_pending = ring->tx_pending; return 0; }