[PATCH net-next v2 1/4] netdevsim: Mark NAPI ID on skb in nsim_rcv

From: Joe Damato
Date: Wed Apr 16 2025 - 21:33:35 EST


Previously, nsim_rcv was not marking the NAPI ID on the skb, leading to
applications seeing a napi ID of 0 when using SO_INCOMING_NAPI_ID.

To add to the userland confusion, netlink appears to correctly report
the NAPI IDs for netdevsim queues but the resulting file descriptor from
a call to accept() was reporting a NAPI ID of 0.

Signed-off-by: Joe Damato <jdamato@xxxxxxxxxx>
---
drivers/net/netdevsim/netdev.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 0e0321a7ddd7..2aa999345fe1 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -29,6 +29,7 @@
#include <net/pkt_cls.h>
#include <net/rtnetlink.h>
#include <net/udp_tunnel.h>
+#include <net/busy_poll.h>

#include "netdevsim.h"

@@ -357,6 +358,7 @@ static int nsim_rcv(struct nsim_rq *rq, int budget)
break;

skb = skb_dequeue(&rq->skb_queue);
+ skb_mark_napi_id(skb, &rq->napi);
netif_receive_skb(skb);
}

--
2.43.0