From: Jason Wang <jasowang@redhat.com>
Date: Tue, 19 Sep 2017 17:42:42 +0800
Subject: virtio-net: add packet len average only when needed during XDP
Patch-mainline: v4.15-rc1
Git-commit: 312403453532b209879aa7faeff296bd3dea78af
References: bsc#1109837
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/virtio_net.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -656,6 +656,9 @@ static struct sk_buff *receive_mergeable
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
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
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;
}
}