linux-kernel - [RFC net-next v3 2/9] netdev-genl: Dump napi_defer_hard

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Message-Id: <20240912100738.16567-3-jdamato@fastly.com>
Date: Thu, 12 Sep 2024 10:07:10 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: mkarsten@...terloo.ca,
	kuba@...nel.org,
	skhawaja@...gle.com,
	sdf@...ichev.me,
	bjorn@...osinc.com,
	amritha.nambiar@...el.com,
	sridhar.samudrala@...el.com,
	Joe Damato <jdamato@...tly.com>,
	Donald Hunter <donald.hunter@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Daniel Jurgens <danielj@...dia.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC net-next v3 2/9] netdev-genl: Dump napi_defer_hard_irqs

Support dumping defer_hard_irqs for a NAPI ID.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 Documentation/netlink/specs/netdev.yaml | 8 ++++++++
 include/uapi/linux/netdev.h             | 1 +
 net/core/netdev-genl.c                  | 5 +++++
 tools/include/uapi/linux/netdev.h       | 1 +
 4 files changed, 15 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 959755be4d7f..351d93994a66 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -244,6 +244,13 @@ attribute-sets:
              threaded mode. If NAPI is not in threaded mode (i.e. uses normal
              softirq context), the attribute will be absent.
         type: u32
+      -
+        name: defer-hard-irqs
+        doc: The number of consecutive empty polls before IRQ deferral ends
+             and hardware IRQs are re-enabled.
+        type: u32
+        checks:
+          max: s32-max
   -
     name: queue
     attributes:
@@ -593,6 +600,7 @@ operations:
             - ifindex
             - irq
             - pid
+            - defer-hard-irqs
       dump:
         request:
           attributes:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 43742ac5b00d..43bb1aad9611 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -121,6 +121,7 @@ enum {
 	NETDEV_A_NAPI_ID,
 	NETDEV_A_NAPI_IRQ,
 	NETDEV_A_NAPI_PID,
+	NETDEV_A_NAPI_DEFER_HARD_IRQS,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index a17d7eaeb001..e67918dd97be 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -160,6 +160,7 @@ static int
 netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 			const struct genl_info *info)
 {
+	u32 napi_defer_hard_irqs;
 	void *hdr;
 	pid_t pid;
 
@@ -188,6 +189,10 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 			goto nla_put_failure;
 	}
 
+	napi_defer_hard_irqs = napi_get_defer_hard_irqs(napi);
+	if (nla_put_s32(rsp, NETDEV_A_NAPI_DEFER_HARD_IRQS, napi_defer_hard_irqs))
+		goto nla_put_failure;
+
 	genlmsg_end(rsp, hdr);
 
 	return 0;
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 43742ac5b00d..43bb1aad9611 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -121,6 +121,7 @@ enum {
 	NETDEV_A_NAPI_ID,
 	NETDEV_A_NAPI_IRQ,
 	NETDEV_A_NAPI_PID,
+	NETDEV_A_NAPI_DEFER_HARD_IRQS,
 
 	__NETDEV_A_NAPI_MAX,
 	NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
-- 
2.25.1