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Commit 5c33474d authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

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: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b00f70b0

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;

		}

	}