zcrx update for-7.1

The series mostly consists of cleanups and preparation patches. Patch 1 tries to close the if queue earlier at the start of io_ring_exit_work() as there are reports io_uring quisce taking too long leading to fails on attempts to reuse a queue. Patch 5 introduces a device-less mode, where there is only copy fallback and no dma/devices/page_pool/etc. Patches 11-12 start moving the memory provider API in the direction of passing netmem arrays instead of working with pp directly, which was suggested before.

Pavel Begunkov (16):
io_uring/zcrx: return back two step unregistration io_uring/zcrx: fully clean area on error in io_import_umem() io_uring/zcrx: always dma map in advance io_uring/zcrx: extract netdev+area init into a helper io_uring/zcrx: implement device-less mode for zcrx io_uring/zcrx: use better name for RQ region io_uring/zcrx: add a struct for refill queue io_uring/zcrx: use guards for locking io_uring/zcrx: move count check into zcrx_get_free_niov io_uring/zcrx: warn on alloc with non-empty pp cache io_uring/zcrx: netmem array as refiling format io_uring/zcrx: consolidate dma syncing io_uring/zcrx: warn on a repeated area append io_uring/zcrx: cache fallback availability in zcrx ctx io_uring/zcrx: check ctrl op payload struct sizes io_uring/zcrx: rename zcrx [un]register functions

 include/uapi/linux/io_uring/zcrx.h |   9 +-
 io_uring/io_uring.c                |   6 +-
 io_uring/register.c                |   2 +-
 io_uring/zcrx.c                    | 364 ++++++++++++++++++-----------
 io_uring/zcrx.h                    |  33 ++-
 5 files changed, 257 insertions(+), 157 deletions(-)

2.53.0