Re: [PATCH bpf-next v4] virtio_net: add XDP meta data support
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2020-02-05 05:34:04
Also in:
bpf, lkml
On Tue, Feb 04, 2020 at 04:16:55PM +0900, Yuya Kusakabe wrote:
quoted hunk ↗ jump to hunk
@@ -852,8 +868,9 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, * adjustments. Note other cases do not build an * skb and avoid using offset */ - offset = xdp.data - - page_address(xdp_page) - vi->hdr_len; + metasize = xdp.data - xdp.data_meta; + offset = xdp.data - page_address(xdp_page) - + vi->hdr_len - metasize; /* recalculate len if xdp.data or xdp.data_end were * adjusted
Tricky to get one's head around. Can you pls update the comment above to document the new math? -- MST