netdev - [net-next PATCH v1 7/9] net: Add NAPI IRQ support

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Date: Fri, 28 Jul 2023 17:47:28 -0700
From: Amritha Nambiar <amritha.nambiar@...el.com>
To: netdev@...r.kernel.org, kuba@...nel.org, davem@...emloft.net
Cc: sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v1 7/9] 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>
---
 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 171177db8fb4..1ebd293ca7de 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -2975,6 +2975,9 @@ int ice_q_vector_add_napi_queues(struct ice_q_vector *q_vector)
 			return ret;
 	}
 
+	/* Also set the interrupt number for the NAPI */
+	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 7afbf346dfd1..a0ae6de1a4aa 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -386,6 +386,7 @@ struct napi_struct {
 	struct hlist_node	napi_hash_node;
 	struct list_head	napi_rxq_list;
 	struct list_head	napi_txq_list;
+	int			irq;
 };
 
 enum {
@@ -2646,6 +2647,11 @@ static inline void *netdev_priv(const struct net_device *dev)
  */
 #define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))
 
+static inline void napi_set_irq(struct napi_struct *napi, int irq)
+{
+	napi->irq = irq;
+}
+
 int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
 			 enum queue_type type);
 
diff --git a/net/core/dev.c b/net/core/dev.c
index 875023ab614c..118f0b957b6e 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,
 
 	INIT_LIST_HEAD(&napi->napi_rxq_list);
 	INIT_LIST_HEAD(&napi->napi_txq_list);
+	napi->irq = -1;
 }
 EXPORT_SYMBOL(netif_napi_add_weight);
 
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index ca3ed6eb457b..8401f646a10b 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -161,6 +161,10 @@ netdev_nl_napi_fill_one(struct sk_buff *msg, struct napi_struct *napi)
 			goto nla_put_failure;
 	}
 
+	if (napi->irq >= 0)
+		if (nla_put_u32(msg, NETDEV_A_NAPI_INFO_ENTRY_IRQ, napi->irq))
+			goto nla_put_failure;
+
 	nla_nest_end(msg, napi_info);
 	return 0;
 nla_put_failure: