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Message-Id: <20240812145633.52911-2-jdamato@fastly.com>
Date: Mon, 12 Aug 2024 14:56:22 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: 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 1/6] netdevice: Add napi_affinity_no_change
Several drivers have their own, very similar, implementations of
determining if IRQ affinity has changed. Create napi_affinity_no_change
to centralize this logic in the core.
This will be used in following commits for various drivers to eliminate
duplicated code.
Signed-off-by: Joe Damato <jdamato@...tly.com>
---
include/linux/netdevice.h | 8 ++++++++
net/core/dev.c | 14 ++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0ef3eaa23f4b..dc714a04b90a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -464,6 +464,14 @@ enum rx_handler_result {
typedef enum rx_handler_result rx_handler_result_t;
typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
+/**
+ * napi_affinity_no_change - determine if CPU affinity changed
+ * @irq: the IRQ whose affinity may have changed
+ *
+ * Return true if the CPU affinity has NOT changed, false otherwise.
+ */
+bool napi_affinity_no_change(unsigned int irq);
+
void __napi_schedule(struct napi_struct *n);
void __napi_schedule_irqoff(struct napi_struct *n);
diff --git a/net/core/dev.c b/net/core/dev.c
index 751d9b70e6ad..9c56ad49490c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -89,6 +89,7 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
+#include <linux/irq.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
@@ -6210,6 +6211,19 @@ void __napi_schedule_irqoff(struct napi_struct *n)
}
EXPORT_SYMBOL(__napi_schedule_irqoff);
+bool napi_affinity_no_change(unsigned int irq)
+{
+ int cpu_curr = smp_processor_id();
+ const struct cpumask *aff_mask;
+
+ aff_mask = irq_get_effective_affinity_mask(irq);
+ if (unlikely(!aff_mask))
+ return true;
+
+ return cpumask_test_cpu(cpu_curr, aff_mask);
+}
+EXPORT_SYMBOL(napi_affinity_no_change);
+
bool napi_complete_done(struct napi_struct *n, int work_done)
{
unsigned long flags, val, new, timeout = 0;
--
2.25.1
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