netdev - [PATCH net-next] net: ethtool: Don't check if RSS context exists in case of context 0

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Message-ID: <20250225071348.509432-1-gal@nvidia.com>
Date: Tue, 25 Feb 2025 09:13:48 +0200
From: Gal Pressman <gal@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>,
	<netdev@...r.kernel.org>
CC: Andrew Lunn <andrew@...n.ch>, Simon Horman <horms@...nel.org>, Joe Damato
	<jdamato@...tly.com>, Gal Pressman <gal@...dia.com>, Tariq Toukan
	<tariqt@...dia.com>
Subject: [PATCH net-next] net: ethtool: Don't check if RSS context exists in case of context 0

Context 0 (default context) always exists, there is no need to check
whether it exists or not when adding a flow steering rule.

The existing check fails when creating a flow steering rule for context
0 as it is not stored in the rss_ctx xarray.

For example:
$ ethtool --config-ntuple eth2 flow-type tcp4 dst-ip 194.237.147.23 dst-port 19983 context 0 loc 618
rmgr: Cannot insert RX class rule: Invalid argument
Cannot insert classification rule

Fixes: de7f7582dff2 ("net: ethtool: prevent flow steering to RSS contexts which don't exist")
Cc: Jakub Kicinski <kuba@...nel.org>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Gal Pressman <gal@...dia.com>
---
 net/ethtool/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 98b7dcea207a..0be7a622dddf 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -998,7 +998,8 @@ static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 		    ethtool_get_flow_spec_ring(info.fs.ring_cookie))
 			return -EINVAL;
 
-		if (!xa_load(&dev->ethtool->rss_ctx, info.rss_context))
+		if (info.rss_context &&
+		    !xa_load(&dev->ethtool->rss_ctx, info.rss_context))
 			return -EINVAL;
 	}
 
-- 
2.40.1