From 8a4e3ab61d496c37595219e5122d91f204cb05de Mon Sep 17 00:00:00 2001 From: Jason Xing Date: Thu, 2 Apr 2026 11:41:14 +0800 Subject: [PATCH] net: advance skb_defer_disable_key check in napi_consume_skb When net.core.skb_defer_max is adjusted to zero, napi_consume_skb() shouldn't go into that deeper in skb_attempt_defer_free() because it adds an additional pair of local_bh_enable/disable() which is evidently not needed. Advancing the check of the static key saves more cycles and benefits non defer case. Signed-off-by: Jason Xing Link: https://patch.msgid.link/20260402034114.65766-1-kerneljasonxing@gmail.com Signed-off-by: Jakub Kicinski --- net/core/skbuff.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 3d6978dd0aa83..4045d7c484a14 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -94,6 +94,7 @@ #include "dev.h" #include "devmem.h" +#include "net-sysfs.h" #include "netmem_priv.h" #include "sock_destructor.h" @@ -1519,7 +1520,8 @@ void napi_consume_skb(struct sk_buff *skb, int budget) DEBUG_NET_WARN_ON_ONCE(!in_softirq()); - if (skb->alloc_cpu != smp_processor_id() && !skb_shared(skb)) { + if (!static_branch_unlikely(&skb_defer_disable_key) && + skb->alloc_cpu != smp_processor_id() && !skb_shared(skb)) { skb_release_head_state(skb); return skb_attempt_defer_free(skb); } -- 2.47.3