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netdevsim: don't overwrite read only ethtool parms

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[ 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@redhat.com>
Link: https://lore.kernel.org/r/20211210175032.411872-1-fpokryvk@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Filip Pokryvka 2021-12-10 18:50:32 +01:00 committed by Greg Kroah-Hartman
parent e5d28205bf
commit 4cd2d21bbe
1 changed files with 4 additions and 1 deletions
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5
drivers/net/netdevsim/ethtool.c
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@ -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;
}