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io_uring/zcrx: add dynamic area provisioning

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It's not always possible for the user to predict during registration how
much memory zcrx will need to sustain the traffic. Allow to dynamically
add more areas with a new ctrl code ZCRX_CTRL_ADD_AREA.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/43495ca686713b3f0014c9f47c4c0276d704da4d.1786108672.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2026-08-07 14:19:34 +01:00
committed by Jens Axboe
parent 5a22bfdd61
commit 3c8a5e2715
2 changed files with 57 additions and 6 deletions
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7
include/uapi/linux/io_uring/zcrx.h
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@@ -116,6 +116,7 @@ enum zcrx_ctrl_op {
ZCRX_CTRL_FLUSH_RQ,
ZCRX_CTRL_EXPORT,
ZCRX_CTRL_ARM_NOTIFICATION,
ZCRX_CTRL_ADD_AREA,
__ZCRX_CTRL_LAST,
};
@@ -134,6 +135,11 @@ struct zcrx_ctrl_arm_notif {
__u32 __resv[11];
};
struct zcrx_ctrl_add_area {
__u64 area_ptr; /* pointer to struct io_uring_zcrx_area_reg */
__u64 __resv[5];
};
struct zcrx_ctrl {
__u32 zcrx_id;
__u32 op; /* see enum zcrx_ctrl_op */
@@ -143,6 +149,7 @@ struct zcrx_ctrl {
struct zcrx_ctrl_export zc_export;
struct zcrx_ctrl_flush_rq zc_flush;
struct zcrx_ctrl_arm_notif zc_arm_notif;
struct zcrx_ctrl_add_area zc_area;
};
};