[net-next,2/3] virtio-net: add packet len average only when needed during XDP
diff mbox series

Message ID 1505814163-7315-2-git-send-email-jasowang@redhat.com
State New, archived
Headers show
Series
  • [net-next,1/3] virtio-net: remove unnecessary parameter of virtnet_xdp_xmit()
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Commit Message

Jason Wang Sept. 19, 2017, 9:42 a.m. UTC
There's no need to add packet len average in the case of XDP_PASS
since it will be done soon after skb is created.

Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/net/virtio_net.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

David Miller Sept. 20, 2017, 9:28 p.m. UTC | #1
From: Jason Wang <jasowang@redhat.com>
Date: Tue, 19 Sep 2017 17:42:42 +0800

> There's no need to add packet len average in the case of XDP_PASS
> since it will be done soon after skb is created.
> 
> Cc: John Fastabend <john.fastabend@gmail.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>

Applied.

Patch
diff mbox series

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a0ef4b0..db5924c 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -656,6 +656,9 @@  static struct sk_buff *receive_mergeable(struct net_device *dev,
 		xdp.data_end = xdp.data + (len - vi->hdr_len);
 		act = bpf_prog_run_xdp(xdp_prog, &xdp);
 
+		if (act != XDP_PASS)
+			ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
+
 		switch (act) {
 		case XDP_PASS:
 			/* recalculate offset to account for any header
@@ -671,14 +674,12 @@  static struct sk_buff *receive_mergeable(struct net_device *dev,
 				put_page(page);
 				head_skb = page_to_skb(vi, rq, xdp_page,
 						       offset, len, PAGE_SIZE);
-				ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
 				return head_skb;
 			}
 			break;
 		case XDP_TX:
 			if (unlikely(!virtnet_xdp_xmit(vi, &xdp)))
 				trace_xdp_exception(vi->dev, xdp_prog, act);
-			ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
 			if (unlikely(xdp_page != page))
 				goto err_xdp;
 			rcu_read_unlock();
@@ -690,7 +691,6 @@  static struct sk_buff *receive_mergeable(struct net_device *dev,
 		case XDP_DROP:
 			if (unlikely(xdp_page != page))
 				__free_pages(xdp_page, 0);
-			ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
 			goto err_xdp;
 		}
 	}