From: Eric Dumazet Date: Sun, 28 Sep 2025 08:49:32 +0000 (+0000) Subject: net: make softnet_data.defer_count an atomic X-Git-Tag: v6.18-rc1~132^2~7^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9c94ae6bb0b2895024b6e29fcc1cbec968b4776a;p=thirdparty%2Fkernel%2Fstable.git net: make softnet_data.defer_count an atomic This is preparation work to remove the softnet_data.defer_lock, as it is contended on hosts with large number of cores. Signed-off-by: Eric Dumazet Reviewed-by: Jason Xing Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250928084934.3266948-2-edumazet@google.com Signed-off-by: Paolo Abeni --- diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 1b85454116f66..27e3fa69253f6 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3538,7 +3538,7 @@ struct softnet_data { /* Another possibly contended cache line */ spinlock_t defer_lock ____cacheline_aligned_in_smp; - int defer_count; + atomic_t defer_count; int defer_ipi_scheduled; struct sk_buff *defer_list; call_single_data_t defer_csd; diff --git a/net/core/dev.c b/net/core/dev.c index 8b54fdf0289ab..8566678d83444 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6726,7 +6726,7 @@ static void skb_defer_free_flush(struct softnet_data *sd) spin_lock(&sd->defer_lock); skb = sd->defer_list; sd->defer_list = NULL; - sd->defer_count = 0; + atomic_set(&sd->defer_count, 0); spin_unlock(&sd->defer_lock); while (skb != NULL) { diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 618afd59afff8..16cd357d62a6b 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -7202,14 +7202,12 @@ nodefer: kfree_skb_napi_cache(skb); sd = &per_cpu(softnet_data, cpu); defer_max = READ_ONCE(net_hotdata.sysctl_skb_defer_max); - if (READ_ONCE(sd->defer_count) >= defer_max) + if (atomic_read(&sd->defer_count) >= defer_max) goto nodefer; spin_lock_bh(&sd->defer_lock); /* Send an IPI every time queue reaches half capacity. */ - kick = sd->defer_count == (defer_max >> 1); - /* Paired with the READ_ONCE() few lines above */ - WRITE_ONCE(sd->defer_count, sd->defer_count + 1); + kick = (atomic_inc_return(&sd->defer_count) - 1) == (defer_max >> 1); skb->next = sd->defer_list; /* Paired with READ_ONCE() in skb_defer_free_flush() */