netdev - [net-next PATCH v3 08/10] net: Add NAPI IRQ support

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Date: Tue, 19 Sep 2023 15:27:57 -0700
From: Amritha Nambiar <amritha.nambiar@...el.com>
To: netdev@...r.kernel.org, kuba@...nel.org
Cc: sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v3 08/10] net: Add NAPI IRQ support

Add support to associate the interrupt vector number for a
NAPI instance.

Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_lib.c |    3 +++
 include/linux/netdevice.h                |    6 ++++++
 net/core/dev.c                           |    1 +
 net/core/netdev-genl.c                   |    4 ++++
 4 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index df1906566185..ede246720898 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -2972,6 +2972,9 @@ int ice_q_vector_add_napi_queues(struct ice_q_vector *q_vector)
 			return ret;
 	}
 
+	/* Also set the interrupt number for the NAPI */
+	netif_napi_set_irq(&q_vector->napi, q_vector->irq.virq);
+
 	return ret;
 }
 
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e7321178dc1a..8be6b3aa70a9 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -382,6 +382,7 @@ struct napi_struct {
 	/* control-path-only fields follow */
 	struct list_head	dev_list;
 	struct hlist_node	napi_hash_node;
+	int			irq;
 };
 
 enum {
@@ -2625,6 +2626,11 @@ static inline void *netdev_priv(const struct net_device *dev)
 int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
 			 enum netdev_queue_type type);
 
+static inline void netif_napi_set_irq(struct napi_struct *napi, int irq)
+{
+	napi->irq = irq;
+}
+
 /* Default NAPI poll() weight
  * Device drivers are strongly advised to not use bigger value
  */
diff --git a/net/core/dev.c b/net/core/dev.c
index ea6b3115ee8b..5087b0e92a59 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6463,6 +6463,7 @@ void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
 	 */
 	if (dev->threaded && napi_kthread_create(napi))
 		dev->threaded = 0;
+	napi->irq = -1;
 }
 EXPORT_SYMBOL(netif_napi_add_weight);
 
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 6f4ed21ebd15..2b3818615e1b 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -167,7 +167,11 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 	if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex))
 		goto nla_put_failure;
 
+	if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq))
+		goto nla_put_failure;
+
 	genlmsg_end(rsp, hdr);
+
 	return 0;
 
 nla_put_failure: