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Message-ID: <20240206163422.646218-8-axboe@kernel.dk>
Date: Tue, 6 Feb 2024 09:30:09 -0700
From: Jens Axboe <axboe@...nel.dk>
To: io-uring@...r.kernel.org,
netdev@...r.kernel.org
Cc: kuba@...nel.org,
olivier@...llion01.com,
Stefan Roesch <shr@...kernel.io>,
Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 7/7] io_uring: add prefer busy poll to register and unregister napi api
From: Stefan Roesch <shr@...kernel.io>
This adds the napi prefer busy poll setting to the register and
unregister napi api. When napi is unregistered and arg is specified,
both napi settings: busy poll timeout and the prefer busy poll setting
are copied into the user structure.
Signed-off-by: Stefan Roesch <shr@...kernel.io>
Acked-by: Jakub Kicinski <kuba@...nel.org>
Link: https://lore.kernel.org/r/20230608163839.2891748-8-shr@devkernel.io
Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
include/uapi/linux/io_uring.h | 3 ++-
io_uring/napi.c | 10 +++++++---
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 26f78eb85934..4f41097a54b9 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -710,7 +710,8 @@ struct io_uring_buf_status {
/* argument for IORING_(UN)REGISTER_NAPI */
struct io_uring_napi {
__u32 busy_poll_to;
- __u32 pad;
+ __u8 prefer_busy_poll;
+ __u8 pad[3];
__u64 resv;
};
diff --git a/io_uring/napi.c b/io_uring/napi.c
index b1a3ed9d1c2e..8ec016899539 100644
--- a/io_uring/napi.c
+++ b/io_uring/napi.c
@@ -217,16 +217,18 @@ void io_napi_free(struct io_ring_ctx *ctx)
int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
{
const struct io_uring_napi curr = {
- .busy_poll_to = ctx->napi_busy_poll_to,
+ .busy_poll_to = ctx->napi_busy_poll_to,
+ .prefer_busy_poll = ctx->napi_prefer_busy_poll
};
struct io_uring_napi napi;
if (copy_from_user(&napi, arg, sizeof(napi)))
return -EFAULT;
- if (napi.pad || napi.resv)
+ if (napi.pad[0] || napi.pad[1] || napi.pad[2] || napi.resv)
return -EINVAL;
WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to);
+ WRITE_ONCE(ctx->napi_prefer_busy_poll, !!napi.prefer_busy_poll);
if (copy_to_user(arg, &curr, sizeof(curr)))
return -EFAULT;
@@ -245,13 +247,15 @@ int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
{
const struct io_uring_napi curr = {
- .busy_poll_to = ctx->napi_busy_poll_to,
+ .busy_poll_to = ctx->napi_busy_poll_to,
+ .prefer_busy_poll = ctx->napi_prefer_busy_poll
};
if (arg && copy_to_user(arg, &curr, sizeof(curr)))
return -EFAULT;
WRITE_ONCE(ctx->napi_busy_poll_to, 0);
+ WRITE_ONCE(ctx->napi_prefer_busy_poll, false);
return 0;
}
--
2.43.0
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