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Message-Id: <20230203060850.3060238-4-shr@devkernel.io>
Date: Thu, 2 Feb 2023 22:08:50 -0800
From: Stefan Roesch <shr@...kernel.io>
To: kernel-team@...com
Cc: shr@...kernel.io, axboe@...nel.dk, olivier@...llion01.com,
netdev@...r.kernel.org, io-uring@...r.kernel.org, kuba@...nel.org,
ammarfaizi2@...weeb.org
Subject: [PATCH v7 3/3] io_uring: add api to set napi prefer busy poll
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@...kernel.io>
Acked-by: Jakub Kicinski <kuba@...nel.org>
---
include/uapi/linux/io_uring.h | 3 ++-
io_uring/io_uring.c | 6 +++++-
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index fce4533c81c3..e166bbe5bad8 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -645,7 +645,8 @@ struct io_uring_buf_reg {
/* 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/io_uring.c b/io_uring/io_uring.c
index 5fe3aa9a1b57..ddf77744e002 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4251,15 +4251,17 @@ static int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
#ifdef CONFIG_NET_RX_BUSY_POLL
const struct io_uring_napi curr = {
.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;
@@ -4275,6 +4277,7 @@ static int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
#ifdef CONFIG_NET_RX_BUSY_POLL
const struct io_uring_napi curr = {
.busy_poll_to = ctx->napi_busy_poll_to,
+ .prefer_busy_poll = ctx->napi_prefer_busy_poll
};
if (arg) {
@@ -4283,6 +4286,7 @@ static int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
}
WRITE_ONCE(ctx->napi_busy_poll_to, 0);
+ WRITE_ONCE(ctx->napi_prefer_busy_poll, false);
return 0;
#else
return -EOPNOTSUPP;
--
2.30.2
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