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io_uring/zcrx: implement device-less mode for zcrx

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Allow creating a zcrx instance without attaching it to a net device.
All data will be copied through the fallback path. The user is also
expected to use ZCRX_CTRL_FLUSH_RQ to handle overflows as it normally
should even with a netdev, but it becomes even more relevant as there
will likely be no one to automatically pick up buffers.

Apart from that, it follows the zcrx uapi for the I/O path, and is
useful for testing, experimentation, and potentially for the copy
receive path in the future if improved.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/674f8ad679c5a0bc79d538352b3042cf0999596e.1774261953.git.asml.silence@gmail.com
[axboe: fix spelling error in uapi header and commit message]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2026-03-23 12:43:54 +00:00
committed by Jens Axboe
parent 06fc3b6d38
commit 825f276491
3 changed files with 36 additions and 16 deletions
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9
include/uapi/linux/io_uring/zcrx.h
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@@ -49,7 +49,14 @@ struct io_uring_zcrx_area_reg {
};
enum zcrx_reg_flags {
ZCRX_REG_IMPORT = 1,
ZCRX_REG_IMPORT = 1,
/*
* Register a zcrx instance without a net device. All data will be
* copied. The refill queue entries might not be automatically
* consumed and need to be flushed, see ZCRX_CTRL_FLUSH_RQ.
*/
ZCRX_REG_NODEV = 2,
};
enum zcrx_features {