* [PATCH v6 1/3] io_uring: add napi busy polling support
2023-02-01 22:22 [PATCH v6 0/3] io_uring: add napi busy polling support Stefan Roesch
@ 2023-02-01 22:22 ` Stefan Roesch
2023-02-01 22:22 ` [PATCH v6 2/3] io_uring: add api to set / get napi configuration Stefan Roesch
2023-02-01 22:22 ` [PATCH v6 3/3] io_uring: add api to set napi prefer busy poll Stefan Roesch
2 siblings, 0 replies; 6+ messages in thread
From: Stefan Roesch @ 2023-02-01 22:22 UTC (permalink / raw)
To: kernel-team; +Cc: shr, axboe, olivier, netdev, io-uring, kuba
This adds the napi busy polling support in io_uring.c. It adds a new
napi_list to the io_ring_ctx structure. This list contains the list of
napi_id's that are currently enabled for busy polling. The list is
synchronized by the new napi_lock spin lock. The current default napi
busy polling time is stored in napi_busy_poll_to. If napi busy polling
is not enabled, the value is 0.
In addition there is also a hash table. The hash table store the napi
id ond the pointer to the above list nodes. The hash table is used to
speed up the lookup to the list elements.
The NAPI_TIMEOUT is stored as a timeout to make sure that the time a
napi entry is stored in the napi list is limited.
The busy poll timeout is also stored as part of the io_wait_queue. This
is necessary as for sq polling the poll interval needs to be adjusted
and the napi callback allows only to pass in one value.
This has been tested with two simple programs from the liburing library
repository: the napi client and the napi server program. The client
sends a request, which has a timestamp in its payload and the server
replies with the same payload. The client calculates the roundtrip time
and stores it to calcualte the results.
The client is running on host1 and the server is running on host 2 (in
the same rack). The measured times below are roundtrip times. They are
average times over 5 runs each. Each run measures 1 million roundtrips.
no rx coal rx coal: frames=88,usecs=33
Default 57us 56us
client_poll=100us 47us 46us
server_poll=100us 51us 46us
client_poll=100us+ 40us 40us
server_poll=100us
client_poll=100us+ 41us 39us
server_poll=100us+
prefer napi busy poll on client
client_poll=100us+ 41us 39us
server_poll=100us+
prefer napi busy poll on server
client_poll=100us+ 41us 39us
server_poll=100us+
prefer napi busy poll on client + server
Signed-off-by: Stefan Roesch <[email protected]>
Suggested-by: Olivier Langlois <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
---
include/linux/io_uring_types.h | 10 ++
io_uring/io_uring.c | 241 +++++++++++++++++++++++++++++++++
io_uring/napi.h | 23 ++++
io_uring/poll.c | 2 +
io_uring/sqpoll.c | 17 +++
5 files changed, 293 insertions(+)
create mode 100644 io_uring/napi.h
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 128a67a40065..d9551790356e 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -2,6 +2,7 @@
#define IO_URING_TYPES_H
#include <linux/blkdev.h>
+#include <linux/hashtable.h>
#include <linux/task_work.h>
#include <linux/bitmap.h>
#include <linux/llist.h>
@@ -274,6 +275,15 @@ struct io_ring_ctx {
struct xarray personalities;
u32 pers_next;
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ struct list_head napi_list; /* track busy poll napi_id */
+ DECLARE_HASHTABLE(napi_ht, 8);
+ spinlock_t napi_lock; /* napi_list lock */
+
+ unsigned int napi_busy_poll_to; /* napi busy poll default timeout */
+ bool napi_prefer_busy_poll;
+#endif
+
struct {
/*
* We cache a range of free CQEs we can use, once exhausted it
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index db623b3185c8..96062036db41 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -90,6 +90,7 @@
#include "rsrc.h"
#include "cancel.h"
#include "net.h"
+#include "napi.h"
#include "notif.h"
#include "timeout.h"
@@ -335,6 +336,14 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
INIT_WQ_LIST(&ctx->locked_free_list);
INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func);
INIT_WQ_LIST(&ctx->submit_state.compl_reqs);
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ INIT_LIST_HEAD(&ctx->napi_list);
+ spin_lock_init(&ctx->napi_lock);
+ ctx->napi_prefer_busy_poll = false;
+ ctx->napi_busy_poll_to = READ_ONCE(sysctl_net_busy_poll);
+#endif
+
return ctx;
err:
kfree(ctx->dummy_ubuf);
@@ -2418,6 +2427,11 @@ struct io_wait_queue {
struct io_ring_ctx *ctx;
unsigned cq_tail;
unsigned nr_timeouts;
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ unsigned int napi_busy_poll_to;
+ bool napi_prefer_busy_poll;
+#endif
};
static inline bool io_has_work(struct io_ring_ctx *ctx)
@@ -2498,6 +2512,196 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
return ret < 0 ? ret : 1;
}
+#ifdef CONFIG_NET_RX_BUSY_POLL
+#define NAPI_TIMEOUT (60 * SEC_CONVERSION)
+
+struct io_napi_ht_entry {
+ unsigned int napi_id;
+ struct list_head list;
+
+ /* Covered by napi lock spinlock. */
+ unsigned long timeout;
+ struct hlist_node node;
+};
+
+static bool io_napi_busy_loop_on(struct io_ring_ctx *ctx)
+{
+ return READ_ONCE(ctx->napi_busy_poll_to);
+}
+
+/*
+ * io_napi_add() - Add napi id to the busy poll list
+ * @file: file pointer for socket
+ * @ctx: io-uring context
+ *
+ * Add the napi id of the socket to the napi busy poll list and hash table.
+ */
+void io_napi_add(struct file *file, struct io_ring_ctx *ctx)
+{
+ unsigned int napi_id;
+ struct socket *sock;
+ struct sock *sk;
+ struct io_napi_ht_entry *he;
+
+ if (!io_napi_busy_loop_on(ctx))
+ return;
+
+ sock = sock_from_file(file);
+ if (!sock)
+ return;
+
+ sk = sock->sk;
+ if (!sk)
+ return;
+
+ napi_id = READ_ONCE(sk->sk_napi_id);
+
+ /* Non-NAPI IDs can be rejected. */
+ if (napi_id < MIN_NAPI_ID)
+ return;
+
+ spin_lock(&ctx->napi_lock);
+ hash_for_each_possible(ctx->napi_ht, he, node, napi_id) {
+ if (he->napi_id == napi_id) {
+ he->timeout = jiffies + NAPI_TIMEOUT;
+ goto out;
+ }
+ }
+
+ he = kmalloc(sizeof(*he), GFP_NOWAIT);
+ if (!he)
+ goto out;
+
+ he->napi_id = napi_id;
+ he->timeout = jiffies + NAPI_TIMEOUT;
+ hash_add(ctx->napi_ht, &he->node, napi_id);
+
+ list_add_tail(&he->list, &ctx->napi_list);
+
+out:
+ spin_unlock(&ctx->napi_lock);
+}
+
+static void io_napi_free_list(struct io_ring_ctx *ctx)
+{
+ unsigned int i;
+ struct io_napi_ht_entry *he;
+ LIST_HEAD(napi_list);
+
+ spin_lock(&ctx->napi_lock);
+ hash_for_each(ctx->napi_ht, i, he, node) {
+ hash_del(&he->node);
+ }
+ spin_unlock(&ctx->napi_lock);
+}
+
+static void io_napi_adjust_busy_loop_timeout(unsigned int poll_to,
+ struct timespec64 *ts,
+ unsigned int *new_poll_to)
+{
+ struct timespec64 pollto = ns_to_timespec64(1000 * (s64)poll_to);
+
+ if (timespec64_compare(ts, &pollto) > 0) {
+ *ts = timespec64_sub(*ts, pollto);
+ *new_poll_to = poll_to;
+ } else {
+ u64 to = timespec64_to_ns(ts);
+
+ do_div(to, 1000);
+ *new_poll_to = to;
+ ts->tv_sec = 0;
+ ts->tv_nsec = 0;
+ }
+}
+
+static inline bool io_napi_busy_loop_timeout(unsigned long start_time,
+ unsigned long bp_usec)
+{
+ if (bp_usec) {
+ unsigned long end_time = start_time + bp_usec;
+ unsigned long now = busy_loop_current_time();
+
+ return time_after(now, end_time);
+ }
+ return true;
+}
+
+/*
+ * io_napi_busy_loop() - napi busy poll loop
+ * @napi_list : list of napi_id's supporting busy polling
+ * @napi_prefer_busy_poll: prefer napi busy polling
+ *
+ * This invokes the napi busy poll loop if sockets have been added to the
+ * napi busy poll list.
+ *
+ * Returns if all napi id's in the list have been processed.
+ */
+bool io_napi_busy_loop(struct list_head *napi_list, bool prefer_busy_poll)
+{
+ struct io_napi_ht_entry *e;
+ struct io_napi_ht_entry *n;
+
+ list_for_each_entry_safe(e, n, napi_list, list) {
+ napi_busy_loop(e->napi_id, NULL, NULL, prefer_busy_poll,
+ BUSY_POLL_BUDGET);
+ }
+
+ return !list_empty(napi_list);
+}
+
+static bool io_napi_busy_loop_end(void *p, unsigned long start_time)
+{
+ struct io_wait_queue *iowq = p;
+
+ return signal_pending(current) ||
+ io_should_wake(iowq) ||
+ io_napi_busy_loop_timeout(start_time, iowq->napi_busy_poll_to);
+}
+
+static void io_napi_blocking_busy_loop(struct list_head *napi_list,
+ struct io_wait_queue *iowq)
+{
+ unsigned long start_time = list_is_singular(napi_list)
+ ? 0
+ : busy_loop_current_time();
+
+ do {
+ if (list_is_singular(napi_list)) {
+ struct io_napi_ht_entry *ne =
+ list_first_entry(napi_list,
+ struct io_napi_ht_entry, list);
+
+ napi_busy_loop(ne->napi_id, io_napi_busy_loop_end, iowq,
+ iowq->napi_prefer_busy_poll, BUSY_POLL_BUDGET);
+ break;
+ }
+ } while (io_napi_busy_loop(napi_list, iowq->napi_prefer_busy_poll) &&
+ !io_napi_busy_loop_end(iowq, start_time));
+}
+
+static void io_napi_remove_stale(struct io_ring_ctx *ctx)
+{
+ unsigned int i;
+ struct io_napi_ht_entry *he;
+
+ hash_for_each(ctx->napi_ht, i, he, node) {
+ if (time_after(jiffies, he->timeout)) {
+ list_del(&he->list);
+ hash_del(&he->node);
+ }
+ }
+
+}
+
+void io_napi_merge_lists(struct io_ring_ctx *ctx, struct list_head *napi_list)
+{
+ spin_lock(&ctx->napi_lock);
+ list_splice(napi_list, &ctx->napi_list);
+ io_napi_remove_stale(ctx);
+ spin_unlock(&ctx->napi_lock);
+}
+#endif
+
/*
* Wait until events become available, if we don't already have some. The
* application must reap them itself, as they reside on the shared cq ring.
@@ -2510,6 +2714,9 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
struct io_rings *rings = ctx->rings;
ktime_t timeout = KTIME_MAX;
int ret;
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ LIST_HEAD(local_napi_list);
+#endif
if (!io_allowed_run_tw(ctx))
return -EEXIST;
@@ -2539,12 +2746,34 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return ret;
}
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ iowq.napi_busy_poll_to = 0;
+ iowq.napi_prefer_busy_poll = READ_ONCE(ctx->napi_prefer_busy_poll);
+
+ if (!(ctx->flags & IORING_SETUP_SQPOLL)) {
+ spin_lock(&ctx->napi_lock);
+ list_splice_init(&ctx->napi_list, &local_napi_list);
+ spin_unlock(&ctx->napi_lock);
+ }
+#endif
+
if (uts) {
struct timespec64 ts;
if (get_timespec64(&ts, uts))
return -EFAULT;
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ if (!list_empty(&local_napi_list)) {
+ io_napi_adjust_busy_loop_timeout(READ_ONCE(ctx->napi_busy_poll_to),
+ &ts, &iowq.napi_busy_poll_to);
+ }
+#endif
timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ } else if (!list_empty(&local_napi_list)) {
+ iowq.napi_busy_poll_to = READ_ONCE(ctx->napi_busy_poll_to);
+#endif
}
init_waitqueue_func_entry(&iowq.wq, io_wake_function);
@@ -2555,6 +2784,15 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
trace_io_uring_cqring_wait(ctx, min_events);
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ if (iowq.napi_busy_poll_to)
+ io_napi_blocking_busy_loop(&local_napi_list, &iowq);
+
+ if (!list_empty(&local_napi_list))
+ io_napi_merge_lists(ctx, &local_napi_list);
+#endif
+
do {
if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) {
finish_wait(&ctx->cq_wait, &iowq.wq);
@@ -2754,6 +2992,9 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_req_caches_free(ctx);
if (ctx->hash_map)
io_wq_put_hash(ctx->hash_map);
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ io_napi_free_list(ctx);
+#endif
kfree(ctx->cancel_table.hbs);
kfree(ctx->cancel_table_locked.hbs);
kfree(ctx->dummy_ubuf);
diff --git a/io_uring/napi.h b/io_uring/napi.h
new file mode 100644
index 000000000000..2abc448dbea0
--- /dev/null
+++ b/io_uring/napi.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef IOU_NAPI_H
+#define IOU_NAPI_H
+
+#include <linux/kernel.h>
+#include <linux/io_uring.h>
+#include <net/busy_poll.h>
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+
+void io_napi_add(struct file *file, struct io_ring_ctx *ctx);
+bool io_napi_busy_loop(struct list_head *napi_list, bool prefer_busy_poll);
+void io_napi_merge_lists(struct io_ring_ctx *ctx, struct list_head *napi_list);
+
+#else
+
+static inline void io_napi_add(struct file *file, struct io_ring_ctx *ctx)
+{
+}
+
+#endif
+#endif
diff --git a/io_uring/poll.c b/io_uring/poll.c
index 2ac1366adbd7..7cf53db667e2 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -15,6 +15,7 @@
#include "io_uring.h"
#include "refs.h"
+#include "napi.h"
#include "opdef.h"
#include "kbuf.h"
#include "poll.h"
@@ -629,6 +630,7 @@ static int __io_arm_poll_handler(struct io_kiocb *req,
__io_poll_execute(req, mask);
return 0;
}
+ io_napi_add(req->file, req->ctx);
if (ipt->owning) {
/*
diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
index 559652380672..b9fb077de15b 100644
--- a/io_uring/sqpoll.c
+++ b/io_uring/sqpoll.c
@@ -15,6 +15,7 @@
#include <uapi/linux/io_uring.h>
#include "io_uring.h"
+#include "napi.h"
#include "sqpoll.h"
#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8
@@ -168,6 +169,9 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
{
unsigned int to_submit;
int ret = 0;
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ LIST_HEAD(local_napi_list);
+#endif
to_submit = io_sqring_entries(ctx);
/* if we're handling multiple rings, cap submit size for fairness */
@@ -193,6 +197,19 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
ret = io_submit_sqes(ctx, to_submit);
mutex_unlock(&ctx->uring_lock);
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ spin_lock(&ctx->napi_lock);
+ list_splice_init(&ctx->napi_list, &local_napi_list);
+ spin_unlock(&ctx->napi_lock);
+
+ if (!list_empty(&local_napi_list) &&
+ READ_ONCE(ctx->napi_busy_poll_to) > 0 &&
+ io_napi_busy_loop(&local_napi_list, ctx->napi_prefer_busy_poll)) {
+ io_napi_merge_lists(ctx, &local_napi_list);
+ ++ret;
+ }
+#endif
+
if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait))
wake_up(&ctx->sqo_sq_wait);
if (creds)
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v6 2/3] io_uring: add api to set / get napi configuration.
2023-02-01 22:22 [PATCH v6 0/3] io_uring: add napi busy polling support Stefan Roesch
2023-02-01 22:22 ` [PATCH v6 1/3] " Stefan Roesch
@ 2023-02-01 22:22 ` Stefan Roesch
2023-02-01 23:15 ` Ammar Faizi
2023-02-01 22:22 ` [PATCH v6 3/3] io_uring: add api to set napi prefer busy poll Stefan Roesch
2 siblings, 1 reply; 6+ messages in thread
From: Stefan Roesch @ 2023-02-01 22:22 UTC (permalink / raw)
To: kernel-team; +Cc: shr, axboe, olivier, netdev, io-uring, kuba
This adds an api to register the busy poll timeout from liburing. To be
able to use this functionality, the corresponding liburing patch is needed.
Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
---
include/uapi/linux/io_uring.h | 11 +++++++
io_uring/io_uring.c | 55 +++++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 2780bce62faf..fce4533c81c3 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -516,6 +516,10 @@ enum {
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
+ /* set/clear busy poll settings */
+ IORING_REGISTER_NAPI = 26,
+ IORING_UNREGISTER_NAPI = 27,
+
/* this goes last */
IORING_REGISTER_LAST
};
@@ -638,6 +642,13 @@ struct io_uring_buf_reg {
__u64 resv[3];
};
+/* argument for IORING_(UN)REGISTER_NAPI */
+struct io_uring_napi {
+ __u32 busy_poll_to;
+ __u32 pad;
+ __u64 resv;
+};
+
/*
* io_uring_restriction->opcode values
*/
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 96062036db41..f2509f0afc7b 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4246,6 +4246,49 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
return ret;
}
+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,
+ };
+ struct io_uring_napi napi;
+
+ if (copy_from_user(&napi, arg, sizeof(napi)))
+ return -EFAULT;
+ if (napi.pad || napi.resv)
+ return -EINVAL;
+
+ WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to);
+
+ if (copy_to_user(arg, &curr, sizeof(curr)))
+ return -EFAULT;
+
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
+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,
+ };
+
+ if (arg) {
+ if (copy_to_user(arg, &curr, sizeof(curr)))
+ return -EFAULT;
+ }
+
+ WRITE_ONCE(ctx->napi_busy_poll_to, 0);
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
void __user *arg, unsigned nr_args)
__releases(ctx->uring_lock)
@@ -4404,6 +4447,18 @@ 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:
+ ret = -EINVAL;
+ if (!arg)
+ break;
+ ret = io_register_napi(ctx, arg);
+ break;
+ case IORING_UNREGISTER_NAPI:
+ ret = -EINVAL;
+ if (!arg)
+ break;
+ ret = io_unregister_napi(ctx, arg);
+ break;
default:
ret = -EINVAL;
break;
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v6 3/3] io_uring: add api to set napi prefer busy poll
2023-02-01 22:22 [PATCH v6 0/3] io_uring: add napi busy polling support Stefan Roesch
2023-02-01 22:22 ` [PATCH v6 1/3] " Stefan Roesch
2023-02-01 22:22 ` [PATCH v6 2/3] io_uring: add api to set / get napi configuration Stefan Roesch
@ 2023-02-01 22:22 ` Stefan Roesch
2 siblings, 0 replies; 6+ messages in thread
From: Stefan Roesch @ 2023-02-01 22:22 UTC (permalink / raw)
To: kernel-team; +Cc: shr, axboe, olivier, netdev, io-uring, kuba
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 <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
---
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 f2509f0afc7b..90dac6c001ac 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 -EINVAL;
--
2.30.2
^ permalink raw reply related [flat|nested] 6+ messages in thread