netdev - [PATCH RFC net-next 7/7] net: virtio_net: add get_rxrings ethtool callback for RX ring queries

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Message-Id: <20250905-gxrings-v1-7-984fc471f28f@debian.org>
Date: Fri, 05 Sep 2025 10:07:26 -0700
From: Breno Leitao <leitao@...ian.org>
To: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
 kuba@...nel.org, Simon Horman <horms@...nel.org>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 virtualization@...ts.linux.dev, Breno Leitao <leitao@...ian.org>, 
 jdamato@...tly.com, kernel-team@...a.com
Subject: [PATCH RFC net-next 7/7] net: virtio_net: add get_rxrings ethtool
 callback for RX ring queries

Replace the existing virtnet_get_rxnfc callback with a dedicated
virtnet_get_rxrings implementation to provide the number of RX rings
directly via the new ethtool_ops get_rxrings pointer.

This simplifies the RX ring count retrieval and aligns virtio_net with
the new ethtool API for querying RX ring parameters.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/virtio_net.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 975bdc5dab84b..942ae55e8897d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -5610,20 +5610,11 @@ static int virtnet_set_rxfh(struct net_device *dev,
 	return 0;
 }

-static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs)
+static int virtnet_get_rxrings(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
-	int rc = 0;

-	switch (info->cmd) {
-	case ETHTOOL_GRXRINGS:
-		info->data = vi->curr_queue_pairs;
-		break;
-	default:
-		rc = -EOPNOTSUPP;
-	}
-
-	return rc;
+	return vi->curr_queue_pairs;
 }

 static const struct ethtool_ops virtnet_ethtool_ops = {
@@ -5651,7 +5642,7 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
 	.set_rxfh = virtnet_set_rxfh,
 	.get_rxfh_fields = virtnet_get_hashflow,
 	.set_rxfh_fields = virtnet_set_hashflow,
-	.get_rxnfc = virtnet_get_rxnfc,
+	.get_rxrings = virtnet_get_rxrings,
 };

 static void virtnet_get_queue_stats_rx(struct net_device *dev, int i,

-- 
2.47.3