From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Mon, 1 Apr 2024 15:36:40 +0000 (-0300)
Subject: net: enable timestamp static key if CPU
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2f3c7195a702178629575b637f3f9a91eabdab73;p=linux.git

net: enable timestamp static key if CPU

For systems that use CPU isolation (via nohz_full), creating or destroying
a socket with SO_TIMESTAMP, SO_TIMESTAMPNS or SO_TIMESTAMPING with flag
SOF_TIMESTAMPING_RX_SOFTWARE will cause a static key to be enabled/disabled.
This in turn causes undesired IPIs to isolated CPUs.

So enable the static key unconditionally, if CPU isolation is enabled,
thus avoiding the IPIs.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/ZgrUiLLtbEUf9SFn@tpad
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 818699dea9d70..9b821d96eff30 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -77,6 +77,7 @@
 #include <linux/hash.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
+#include <linux/sched/isolation.h>
 #include <linux/sched/mm.h>
 #include <linux/smpboot.h>
 #include <linux/mutex.h>
@@ -11911,6 +11912,10 @@ static int __init net_dev_init(void)
 				       NULL, dev_cpu_dead);
 	WARN_ON(rc < 0);
 	rc = 0;
+
+	/* avoid static key IPIs to isolated CPUs */
+	if (housekeeping_enabled(HK_TYPE_MISC))
+		net_enable_timestamp();
 out:
 	if (rc < 0) {
 		for_each_possible_cpu(i) {