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Normally MSG_RING requires both a source and a destination ring. But some users don't always have a ring avilable to send a message from, yet they still need to notify a target ring. Add support for using io_uring_register(2) without having a source ring, using a file descriptor of -1 for that. Internally those are called blind registration opcodes. Implement IORING_REGISTER_SEND_MSG_RING as a blind opcode, which simply takes an sqe that the application can put on the stack and use the normal liburing helpers to initialize it. Then the app can call: io_uring_register(-1, IORING_REGISTER_SEND_MSG_RING, &sqe, 1); and get the same behavior in terms of the target, where a CQE is posted with the details given in the sqe. For now this takes a single sqe pointer argument, and hence arg must be set to that, and nr_args must be 1. Could easily be extended to take an array of sqes, but for now let's keep it simple. Link: https://lore.kernel.org/r/20240924115932.116167-3-axboe@kernel.dk Signed-off-by: Jens Axboe <axboe@kernel.dk>
7 lines
323 B
C
7 lines
323 B
C
// SPDX-License-Identifier: GPL-2.0
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int io_uring_sync_msg_ring(struct io_uring_sqe *sqe);
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int io_msg_ring_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags);
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void io_msg_ring_cleanup(struct io_kiocb *req);
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void io_msg_cache_free(const void *entry);
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