From 5c33474d41af09f09c98f1df70f267920587bec0 Mon Sep 17 00:00:00 2001 From: Jason Wang <jasowang@redhat.com> Date: Fri, 23 Dec 2016 22:37:29 +0800 Subject: [PATCH] virtio-net: make rx buf size estimation works for XDP We don't update ewma rx buf size in the case of XDP. This will lead underestimation of rx buf size which causes host to produce more than one buffers. This will greatly increase the possibility of XDP page linearization. Cc: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- drivers/net/virtio_net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 0778dc88597e1e..77ae358ec6306c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -584,10 +584,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, put_page(page); head_skb = page_to_skb(vi, rq, xdp_page, 0, len, PAGE_SIZE); + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); return head_skb; } break; case XDP_TX: + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); if (unlikely(xdp_page != page)) goto err_xdp; rcu_read_unlock(); @@ -596,6 +598,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, default: if (unlikely(xdp_page != page)) __free_pages(xdp_page, 0); + ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); goto err_xdp; } } -- GitLab