Merge branch 'splice-net-some-miscellaneous-msg_splice_pages-changes'

Merge branch 'splice-net-some-miscellaneous-msg_splice_pages-changes'

David Howells says:

====================
splice, net: Some miscellaneous MSG_SPLICE_PAGES changes

Now that the splice_to_socket() has been rewritten so that nothing now uses
the ->sendpage() file op[1], some further changes can be made, so here are
some miscellaneous changes that can now be done.

 (1) Remove the ->sendpage() file op.

 (2) Remove hash_sendpage*() from AF_ALG.

 (3) Make sunrpc send multiple pages in single sendmsg() call rather than
     calling sendpage() in TCP (or maybe TLS).

 (4) Make tcp_bpf_sendpage() a wrapper around tcp_bpf_sendmsg().

 (5) Make AF_KCM use sendmsg() when calling down to TCP and then make it
     send entire fragment lists in single sendmsg calls.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=fd5f4d7da29218485153fd8b4c08da7fc130c79f
====================

Link: https://lore.kernel.org/r/20230609100221.2620633-1-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>