This adds an api to register and unregister the napi prefer busy poll
setting 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 | 3 ++-
io_uring/io_uring.c | 17 +++++++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 9b5c1df0d1d8..25b91a4dc103 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -490,7 +490,8 @@ enum {
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
- /* set/clear busy poll timeout */
+ /* set/clear busy poll settings */
+ IORING_REGISTER_NAPI_PREFER_BUSY_POLL = 26,
IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT = 27,
/* this goes last */
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index f6c9c9cbe0f8..eca9f7540123 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4122,6 +4122,17 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
return ret;
}
+static int io_register_napi_prefer_busy_poll(struct io_ring_ctx *ctx,
+ unsigned int prefer_napi)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ WRITE_ONCE(ctx->napi_prefer_busy_poll, !!prefer_napi);
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
static int io_register_napi_busy_poll_timeout(struct io_ring_ctx *ctx, unsigned int to)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
@@ -4292,6 +4303,12 @@ 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_PREFER_BUSY_POLL:
+ ret = -EINVAL;
+ if (arg || !nr_args)
+ break;
+ ret = io_register_napi_prefer_busy_poll(ctx, nr_args);
+ break;
case IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT:
ret = -EINVAL;
if (arg || !nr_args)
--
2.30.2
