netdev - [net-next PATCH v2 9/9] netdev-genl: Add PID for the NAPI thread

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Date: Mon, 21 Aug 2023 16:25:57 -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 v2 9/9] 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>
---
 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 63b8690d8ba3..47be577782e4 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -141,6 +141,7 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
 	struct netdev_rx_queue *rx_queue, *rxq;
 	struct netdev_queue *tx_queue, *txq;
 	unsigned int rx_qid, tx_qid;
+	pid_t pid;
 	void *hdr;
 
 	if (!napi->dev)
@@ -171,6 +172,12 @@ 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;