io_uring/zcrx: add sync refill queue flushing

Add an zcrx interface via IORING_REGISTER_ZCRX_CTRL that forces the
kernel to flush / consume entries from the refill queue. Just as with
the IORING_REGISTER_ZCRX_REFILL attempt, the motivation is to address
cases where the refill queue becomes full, and the user can't return
buffers and needs to stash them. It's still a slow path, and the user
should size refill queue appropriately, but it should be helpful for
handling temporary traffic spikes and other unpredictable conditions.

The interface is simpler comparing to ZCRX_REFILL as it doesn't need
temporary refill entry arrays and gives natural batching, whereas
ZCRX_REFILL requires even more user logic to be somewhat efficient.

Also, add a structure for the operation. It's not currently used but
can serve for future improvements like limiting the number of buffers to
process, etc.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/uapi/linux/io_uring.h

@@ -1082,13 +1082,21 @@ struct io_uring_zcrx_ifq_reg {
 };
 
 enum zcrx_ctrl_op {
+	ZCRX_CTRL_FLUSH_RQ,
+
 	__ZCRX_CTRL_LAST,
 };
 
+struct zcrx_ctrl_flush_rq {
+	__u64		__resv[6];
+};
+
 struct zcrx_ctrl {
 	__u32	zcrx_id;
 	__u32	op; /* see enum zcrx_ctrl_op */
-	__u64	__resv[8];
+	__u64	__resv[2];
+
+	struct zcrx_ctrl_flush_rq	zc_flush;
 };
 
 #ifdef __cplusplus