netdev - [PATCH net-next 04/20] net: Add ndo_{peer,unpeer}

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Message-ID: <20250919213153.103606-5-daniel@iogearbox.net>
Date: Fri, 19 Sep 2025 23:31:37 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org,
	kuba@...nel.org,
	davem@...emloft.net,
	razor@...ckwall.org,
	pabeni@...hat.com,
	willemb@...gle.com,
	sdf@...ichev.me,
	john.fastabend@...il.com,
	martin.lau@...nel.org,
	jordan@...fe.io,
	maciej.fijalkowski@...el.com,
	magnus.karlsson@...el.com,
	David Wei <dw@...idwei.uk>
Subject: [PATCH net-next 04/20] net: Add ndo_{peer,unpeer}_queues callback

Add ndo_{peer,unpeer}_queues() callback which can be used by virtual drivers
that implement rxq mapping to a real rxq to update their internal state or
exposed capability flags from the set of rxq mappings.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Co-developed-by: David Wei <dw@...idwei.uk>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/linux/netdevice.h     | 15 ++++++++++++++-
 include/net/netdev_rx_queue.h |  4 ++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1c54d44805fa..43b3c4e3593e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -65,6 +65,7 @@ struct macsec_context;
 struct macsec_ops;
 struct netdev_config;
 struct netdev_name_node;
+struct netdev_rx_queue;
 struct sd_flow_limit;
 struct sfp_bus;
 /* 802.11 specific */
@@ -1404,6 +1405,15 @@ struct netdev_net_notifier {
  *			   struct kernel_hwtstamp_config *kernel_config,
  *			   struct netlink_ext_ack *extack);
  *	Change the hardware timestamping parameters for NIC device.
+ *
+ * void (*ndo_peer_queues)(struct net_device *dev, struct netdev_rx_queue *rxq);
+ *	Custom callback for drivers when a physical queue gets peered with
+ *	a virtual one, so that device drivers can update exposed device flags.
+ *
+ * void (*ndo_unpeer_queues)(struct net_device *dev, struct netdev_rx_queue *rxq);
+ *	Custom callback for drivers when a physical queue gets unpeered with
+ *	a virtual one, so that device drivers can update exposed device flags.
+ *	Reverse operation of ndo_peer_queues.
  */
 struct net_device_ops {
 	int			(*ndo_init)(struct net_device *dev);
@@ -1651,7 +1661,10 @@ struct net_device_ops {
 	int			(*ndo_hwtstamp_set)(struct net_device *dev,
 						    struct kernel_hwtstamp_config *kernel_config,
 						    struct netlink_ext_ack *extack);
-
+	void			(*ndo_peer_queues)(struct net_device *dev,
+						   struct netdev_rx_queue *rxq);
+	void			(*ndo_unpeer_queues)(struct net_device *dev,
+						     struct netdev_rx_queue *rxq);
 #if IS_ENABLED(CONFIG_NET_SHAPER)
 	/**
 	 * @net_shaper_ops: Device shaping offload operations
diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
index 47126ccaf854..fdfacd28c2ae 100644
--- a/include/net/netdev_rx_queue.h
+++ b/include/net/netdev_rx_queue.h
@@ -72,6 +72,8 @@ static inline void netdev_rx_queue_peer(struct net_device *src_dev,
 {
 	dev_hold(src_dev);
 	__netdev_rx_queue_peer(src_rxq, dst_rxq);
+	if (dst_rxq->dev->netdev_ops->ndo_peer_queues)
+		dst_rxq->dev->netdev_ops->ndo_peer_queues(dst_rxq->dev, dst_rxq);
 }
 
 static inline void __netdev_rx_queue_unpeer(struct netdev_rx_queue *src_rxq,
@@ -85,6 +87,8 @@ static inline void netdev_rx_queue_unpeer(struct net_device *src_dev,
 					  struct netdev_rx_queue *src_rxq,
 					  struct netdev_rx_queue *dst_rxq)
 {
+	if (dst_rxq->dev->netdev_ops->ndo_unpeer_queues)
+		dst_rxq->dev->netdev_ops->ndo_unpeer_queues(dst_rxq->dev, dst_rxq);
 	__netdev_rx_queue_unpeer(src_rxq, dst_rxq);
 	dev_put(src_dev);
 }
-- 
2.43.0