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>

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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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41

io_uring/zcrx.c

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2

io_uring/zcrx.h

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