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Message-Id: <20240812125717.413108-4-jdamato@fastly.com>
Date: Mon, 12 Aug 2024 12:57:06 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: mkarsten@...terloo.ca,
amritha.nambiar@...el.com,
sridhar.samudrala@...el.com,
sdf@...ichev.me,
Joe Damato <jdamato@...tly.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Jiri Pirko <jiri@...nulli.us>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
linux-kernel@...r.kernel.org (open list)
Subject: [RFC net-next 3/5] net: Add control functions for irq suspension
From: Martin Karsten <mkarsten@...terloo.ca>
The napi_suspend_irqs routine bootstraps irq suspension by elongating
the defer timeout to irq_suspend_timeout.
The napi_resume_irqs routine effectly cancels irq suspension by forcing
the napi to be scheduled immediately.
Signed-off-by: Martin Karsten <mkarsten@...terloo.ca>
Co-developed-by: Joe Damato <jdamato@...tly.com>
Signed-off-by: Joe Damato <jdamato@...tly.com>
Tested-by: Joe Damato <jdamato@...tly.com>
Tested-by: Martin Karsten <mkarsten@...terloo.ca>
---
include/net/busy_poll.h | 3 +++
net/core/dev.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index 9b09acac538e..f095b2bdeee1 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -52,6 +52,9 @@ void napi_busy_loop_rcu(unsigned int napi_id,
bool (*loop_end)(void *, unsigned long),
void *loop_end_arg, bool prefer_busy_poll, u16 budget);
+void napi_suspend_irqs(unsigned int napi_id);
+void napi_resume_irqs(unsigned int napi_id);
+
#else /* CONFIG_NET_RX_BUSY_POLL */
static inline unsigned long net_busy_loop_on(void)
{
diff --git a/net/core/dev.c b/net/core/dev.c
index a19470253eb4..bd23f2c68558 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6505,6 +6505,39 @@ void napi_busy_loop(unsigned int napi_id,
}
EXPORT_SYMBOL(napi_busy_loop);
+void napi_suspend_irqs(unsigned int napi_id)
+{
+ struct napi_struct *napi;
+
+ rcu_read_lock();
+ napi = napi_by_id(napi_id);
+ if (napi) {
+ unsigned long timeout = READ_ONCE(napi->dev->irq_suspend_timeout);
+
+ if (timeout)
+ hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED);
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(napi_suspend_irqs);
+
+void napi_resume_irqs(unsigned int napi_id)
+{
+ struct napi_struct *napi;
+
+ rcu_read_lock();
+ napi = napi_by_id(napi_id);
+ if (napi) {
+ if (READ_ONCE(napi->dev->irq_suspend_timeout)) {
+ local_bh_disable();
+ napi_schedule(napi);
+ local_bh_enable();
+ }
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(napi_resume_irqs);
+
#endif /* CONFIG_NET_RX_BUSY_POLL */
static void napi_hash_add(struct napi_struct *napi)
--
2.25.1
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