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Separating the logic of preparation for xdp from receive_mergeable. The purpose of this is to simplify the logic of execution of XDP. The main logic here is that when headroom is insufficient, we need to allocate a new page and calculate offset. It should be noted that if there is new page, the variable page will refer to the new page. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>