diff options
Diffstat (limited to 'features/rt/net-Use-skbufhead-with-raw-lock.patch')
| -rw-r--r-- | features/rt/net-Use-skbufhead-with-raw-lock.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/features/rt/net-Use-skbufhead-with-raw-lock.patch b/features/rt/net-Use-skbufhead-with-raw-lock.patch new file mode 100644 index 00000000..3309dda6 --- /dev/null +++ b/features/rt/net-Use-skbufhead-with-raw-lock.patch @@ -0,0 +1,73 @@ +From d7ca8b65392672151fbaaa0c0ec93b3be0dd2d51 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 12 Jul 2011 15:38:34 +0200 +Subject: [PATCH 141/191] net: Use skbufhead with raw lock + +Use the rps lock as rawlock so we can keep irq-off regions. It looks low +latency. However we can't kfree() from this context therefore we defer this +to the softirq and use the tofree_queue list for it (similar to process_queue). + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +--- + include/linux/skbuff.h | 7 +++++++ + net/core/dev.c | 6 +++--- + 2 files changed, 10 insertions(+), 3 deletions(-) + +diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h +index 6d0a33d1c0db..3402903b5cf0 100644 +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -295,6 +295,7 @@ struct sk_buff_head { + + __u32 qlen; + spinlock_t lock; ++ raw_spinlock_t raw_lock; + }; + + struct sk_buff; +@@ -1902,6 +1903,12 @@ static inline void skb_queue_head_init(struct sk_buff_head *list) + __skb_queue_head_init(list); + } + ++static inline void skb_queue_head_init_raw(struct sk_buff_head *list) ++{ ++ raw_spin_lock_init(&list->raw_lock); ++ __skb_queue_head_init(list); ++} ++ + static inline void skb_queue_head_init_class(struct sk_buff_head *list, + struct lock_class_key *class) + { +diff --git a/net/core/dev.c b/net/core/dev.c +index 2d6ee43e02b8..16c9aa19ede2 100644 +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -223,14 +223,14 @@ static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) + static inline void rps_lock(struct softnet_data *sd) + { + #ifdef CONFIG_RPS +- spin_lock(&sd->input_pkt_queue.lock); ++ raw_spin_lock(&sd->input_pkt_queue.raw_lock); + #endif + } + + static inline void rps_unlock(struct softnet_data *sd) + { + #ifdef CONFIG_RPS +- spin_unlock(&sd->input_pkt_queue.lock); ++ raw_spin_unlock(&sd->input_pkt_queue.raw_lock); + #endif + } + +@@ -11478,7 +11478,7 @@ static int __init net_dev_init(void) + + INIT_WORK(flush, flush_backlog); + +- skb_queue_head_init(&sd->input_pkt_queue); ++ skb_queue_head_init_raw(&sd->input_pkt_queue); + skb_queue_head_init(&sd->process_queue); + #ifdef CONFIG_XFRM_OFFLOAD + skb_queue_head_init(&sd->xfrm_backlog); +-- +2.19.1 + |