Merge branch 'io_uring-zerocopy-send' of git://git.kernel.org/pub/scm/linux/kernel...

Merge prep net series for io_uring tx zc from the Jakub's tree.

* 'io_uring-zerocopy-send' of git://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux:
  net: fix uninitialised msghdr->sg_from_iter
  tcp: support externally provided ubufs
  ipv6/udp: support externally provided ubufs
  ipv4/udp: support externally provided ubufs
  net: introduce __skb_fill_page_desc_noacc
  net: introduce managed frags infrastructure
  net: Allow custom iter handler in msghdr
  skbuff: carry external ubuf_info in msghdr
  skbuff: add SKBFL_DONT_ORPHAN flag
  skbuff: don't mix ubuf_info from different sources
  ipv6: avoid partial copy for zc
  ipv4: avoid partial copy for zc