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475eb39b00
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>