This adds an api to register and unregister the busy poll timeout from
liburing. To be able to use this functionality, the corresponding
liburing patch is needed.
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
include/uapi/linux/io_uring.h | 4 ++++
io_uring/io_uring.c | 18 ++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index ab7458033ee3..48670074e1fc 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -490,6 +490,10 @@ enum {
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
+ /* set/clear busy poll timeout */
+ IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT = 26,
+ IORING_UNREGISTER_NAPI_BUSY_POLL_TIMEOUT= 27,
+
/* this goes last */
IORING_REGISTER_LAST
};
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index f64ccd537d05..c3d277772ca0 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4108,6 +4108,12 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
return ret;
}
+static int io_register_napi_busy_poll_timeout(struct io_ring_ctx *ctx, unsigned int to)
+{
+ WRITE_ONCE(ctx->napi_busy_poll_to, to);
+ return 0;
+}
+
static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
void __user *arg, unsigned nr_args)
__releases(ctx->uring_lock)
@@ -4268,6 +4274,18 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
break;
ret = io_register_file_alloc_range(ctx, arg);
break;
+ case IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT:
+ ret = -EINVAL;
+ if (arg || !nr_args)
+ break;
+ ret = io_register_napi_busy_poll_timeout(ctx, nr_args);
+ break;
+ case IORING_UNREGISTER_NAPI_BUSY_POLL_TIMEOUT:
+ ret = -EINVAL;
+ if (arg || nr_args)
+ break;
+ ret = io_register_napi_busy_poll_timeout(ctx, nr_args);
+ break;
default:
ret = -EINVAL;
break;
--
2.30.2
