netdev - [PATCH] net: Handle threadirqs in __napi_schedule

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Message-Id: <20240913150954.2287196-1-sean.anderson@linux.dev>
Date: Fri, 13 Sep 2024 11:09:54 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Cc: Juri Lelli <juri.lelli@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH] net: Handle threadirqs in __napi_schedule_irqoff

The threadirqs kernel parameter can be used to force threaded IRQs even
on non-PREEMPT_RT kernels. Use force_irqthreads to determine if we can
skip disabling local interrupts. This defaults to false on regular
kernels, and is always true on PREEMPT_RT kernels.

Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
---

 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 1e740faf9e78..112e871bc2b0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6202,7 +6202,7 @@ EXPORT_SYMBOL(napi_schedule_prep);
  */
 void __napi_schedule_irqoff(struct napi_struct *n)
 {
-	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+	if (!force_irqthreads())
 		____napi_schedule(this_cpu_ptr(&softnet_data), n);
 	else
 		__napi_schedule(n);
-- 
2.35.1.1320.gc452695387.dirty