From: Li RongQing Date: Thu, 26 Aug 2021 08:21:35 +0000 (+0800) Subject: virtio_net: reduce raw_smp_processor_id() calling in virtnet_xdp_get_sq X-Git-Tag: v5.15-rc1~157^2~34 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3dcc1edcbbc68991e7b3b1be6a6a7962a730fa35;p=thirdparty%2Flinux.git virtio_net: reduce raw_smp_processor_id() calling in virtnet_xdp_get_sq smp_processor_id()/raw* will be called once each when not more queues in virtnet_xdp_get_sq() which is called in non-preemptible context, so it's safe to call the function smp_processor_id() once. Signed-off-by: Li RongQing Signed-off-by: David S. Miller --- diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index b4ae2ac8a249c..271d38c1d9f80 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -528,19 +528,20 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, * functions to perfectly solve these three problems at the same time. */ #define virtnet_xdp_get_sq(vi) ({ \ + int cpu = smp_processor_id(); \ struct netdev_queue *txq; \ typeof(vi) v = (vi); \ unsigned int qp; \ \ if (v->curr_queue_pairs > nr_cpu_ids) { \ qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ - qp += smp_processor_id(); \ + qp += cpu; \ txq = netdev_get_tx_queue(v->dev, qp); \ __netif_tx_acquire(txq); \ } else { \ - qp = smp_processor_id() % v->curr_queue_pairs; \ + qp = cpu % v->curr_queue_pairs; \ txq = netdev_get_tx_queue(v->dev, qp); \ - __netif_tx_lock(txq, raw_smp_processor_id()); \ + __netif_tx_lock(txq, cpu); \ } \ v->sq + qp; \ })