diff options
| author | David Wei <dw@davidwei.uk> | 2025-02-14 16:09:36 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-02-17 05:41:03 -0700 |
| commit | 6f377873cb23905009759b7366b9fe85c2a6ff37 (patch) | |
| tree | 174674c6e7cc5055cdf90ccdc99e7b3032c57483 /include/linux | |
| parent | 5c496ff11df179c32db960cf10af90a624a035eb (diff) | |
io_uring/zcrx: add interface queue and refill queue
Add a new object called an interface queue (ifq) that represents a net
rx queue that has been configured for zero copy. Each ifq is registered
using a new registration opcode IORING_REGISTER_ZCRX_IFQ.
The refill queue is allocated by the kernel and mapped by userspace
using a new offset IORING_OFF_RQ_RING, in a similar fashion to the main
SQ/CQ. It is used by userspace to return buffers that it is done with,
which will then be re-used by the netdev again.
The main CQ ring is used to notify userspace of received data by using
the upper 16 bytes of a big CQE as a new struct io_uring_zcrx_cqe. Each
entry contains the offset + len to the data.
For now, each io_uring instance only has a single ifq.
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: David Wei <dw@davidwei.uk>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20250215000947.789731-2-dw@davidwei.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/io_uring_types.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 123e69368730..c0fe8a00fe53 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -40,6 +40,8 @@ enum io_uring_cmd_flags { IO_URING_F_TASK_DEAD = (1 << 13), }; +struct io_zcrx_ifq; + struct io_wq_work_node { struct io_wq_work_node *next; }; @@ -382,6 +384,8 @@ struct io_ring_ctx { struct wait_queue_head poll_wq; struct io_restriction restrictions; + struct io_zcrx_ifq *ifq; + u32 pers_next; struct xarray personalities; @@ -434,6 +438,8 @@ struct io_ring_ctx { struct io_mapped_region ring_region; /* used for optimised request parameter and wait argument passing */ struct io_mapped_region param_region; + /* just one zcrx per ring for now, will move to io_zcrx_ifq eventually */ + struct io_mapped_region zcrx_region; }; /* |