virtio-net: make rx buf size estimation works for XDP (5c33474d) · Commits · 戴 / test

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 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}

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