linux-kernel - [PATCH 5.15 063/177] netdevsim: dont overwrite read only ethtool parms

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Date:   Mon, 20 Dec 2021 15:33:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Filip Pokryvka <fpokryvk@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 063/177] netdevsim: dont overwrite read only ethtool parms

From: Filip Pokryvka <fpokryvk@...hat.com>

[ 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@...hat.com>
Link: https://lore.kernel.org/r/20211210175032.411872-1-fpokryvk@redhat.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/netdevsim/ethtool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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;
 }
 
-- 
2.33.0