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H A Dip_output.cdiff c445f31b3cfaa008e110bf548c3a1f0198d332d4 Tue Jul 12 15:52:33 CDT 2022 Pavel Begunkov <asml.silence@gmail.com> ipv4/udp: support externally provided ubufs

Teach ipv4/udp how to use external ubuf_info provided in msghdr and
also prepare it for managed frags by sprinkling
skb_zcopy_downgrade_managed() when it could mix managed and not managed
frags.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>