[PATCH net-next v4 4/4] netdevsim: account dropped packet length in stats on queue free

[Breno Leitao]

Add a call to dev_dstats_rx_dropped_add() in nsim_queue_free() to
account for the number of packets dropped when purging the skb queue.
This improves the accuracy of RX drop statistics reported by netdevsim.

local_bh_{disable, enable}() protection is used to disable preemption,
which is necessary given that dev_dstats_rx_dropped_add() access
this_cpu_ptr(). See discussion in [1].

Link: https://lore.kernel.org/all/20250617055934.3fd9d...@kernel.org/ [1]
Suggested-by: Jakub Kicinski <k...@kernel.org>
Signed-off-by: Breno Leitao <lei...@debian.org>
---
 drivers/net/netdevsim/netdev.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index de309ff69e43e..07171cf8b07ee 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -632,9 +632,12 @@ static struct nsim_rq *nsim_queue_alloc(void)
        return rq;
 }
 
-static void nsim_queue_free(struct nsim_rq *rq)
+static void nsim_queue_free(struct net_device *dev, struct nsim_rq *rq)
 {
        hrtimer_cancel(&rq->napi_timer);
+       local_bh_disable();
+       dev_dstats_rx_dropped_add(dev, rq->skb_queue.qlen);
+       local_bh_enable();
        skb_queue_purge_reason(&rq->skb_queue, SKB_DROP_REASON_QUEUE_PURGE);
        kfree(rq);
 }
@@ -681,7 +684,7 @@ nsim_queue_mem_alloc(struct net_device *dev, void 
*per_queue_mem, int idx)
        return 0;
 
 err_free:
-       nsim_queue_free(qmem->rq);
+       nsim_queue_free(dev, qmem->rq);
        return err;
 }
 
@@ -695,7 +698,7 @@ static void nsim_queue_mem_free(struct net_device *dev, 
void *per_queue_mem)
                if (!ns->rq_reset_mode)
                        netif_napi_del_locked(&qmem->rq->napi);
                page_pool_destroy(qmem->rq->page_pool);
-               nsim_queue_free(qmem->rq);
+               nsim_queue_free(dev, qmem->rq);
        }
 }
 
@@ -913,7 +916,7 @@ static void nsim_queue_uninit(struct netdevsim *ns)
        int i;
 
        for (i = 0; i < dev->num_rx_queues; i++)
-               nsim_queue_free(ns->rq[i]);
+               nsim_queue_free(dev, ns->rq[i]);
 
        kfree(ns->rq);
        ns->rq = NULL;

-- 
2.47.1