netdev - [net-next PATCH v4 10/10] netdev-genl: Add PID for the NAPI thread

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Message-ID: <169658373113.3683.333790071628109423.stgit@anambiarhost.jf.intel.com>
Date: Fri, 06 Oct 2023 02:15:31 -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 v4 10/10] netdev-genl: Add PID for the NAPI thread

In the threaded NAPI mode, expose the PID of the NAPI thread.

Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
---
 net/core/netdev-genl.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 336fcaaf169a..d1dec79aac12 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -151,6 +151,7 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 			const struct genl_info *info)
 {
 	void *hdr;
+	pid_t pid;
 
 	if (WARN_ON_ONCE(!napi->dev))
 		return -EINVAL;
@@ -169,6 +170,12 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 	if (napi->irq >= 0 && nla_put_u32(rsp, NETDEV_A_NAPI_IRQ, napi->irq))
 		goto nla_put_failure;
 
+	if (napi->thread) {
+		pid = task_pid_nr(napi->thread);
+		if (nla_put_s32(rsp, NETDEV_A_NAPI_PID, pid))
+			goto nla_put_failure;
+	}
+
 	genlmsg_end(rsp, hdr);
 
 	return 0;