net: bulk free SKBs that were delay free'ed due to IRQ context
The network stack defers SKBs free, in-case free happens in IRQ or when IRQs are disabled. This happens in __dev_kfree_skb_irq() that writes SKBs that were free'ed during IRQ to the softirq completion queue (softnet_data.completion_queue). These SKBs are naturally delayed, and cleaned up during NET_TX_SOFTIRQ in function net_tx_action(). Take advantage of this a use the skb defer and flush API, as we are already in softirq context. For modern drivers this rarely happens. Although most drivers do call dev_kfree_skb_any(), which detects the situation and calls __dev_kfree_skb_irq() when needed. This due to netpoll can call from IRQ context. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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795bb1c00d
Коммит
15fad714be
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@ -2407,6 +2407,7 @@ static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi,
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void napi_consume_skb(struct sk_buff *skb, int budget);
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void __kfree_skb_flush(void);
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void __kfree_skb_defer(struct sk_buff *skb);
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/**
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* __dev_alloc_pages - allocate page for network Rx
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@ -3829,8 +3829,14 @@ static void net_tx_action(struct softirq_action *h)
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trace_consume_skb(skb);
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else
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trace_kfree_skb(skb, net_tx_action);
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__kfree_skb(skb);
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if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
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__kfree_skb(skb);
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else
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__kfree_skb_defer(skb);
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}
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__kfree_skb_flush();
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}
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if (sd->output_queue) {
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@ -767,7 +767,7 @@ void __kfree_skb_flush(void)
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}
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}
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static void __kfree_skb_defer(struct sk_buff *skb)
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static inline void _kfree_skb_defer(struct sk_buff *skb)
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{
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struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
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@ -789,6 +789,10 @@ static void __kfree_skb_defer(struct sk_buff *skb)
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nc->skb_count = 0;
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}
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}
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void __kfree_skb_defer(struct sk_buff *skb)
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{
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_kfree_skb_defer(skb);
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}
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void napi_consume_skb(struct sk_buff *skb, int budget)
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{
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@ -814,7 +818,7 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
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return;
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}
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__kfree_skb_defer(skb);
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_kfree_skb_defer(skb);
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}
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EXPORT_SYMBOL(napi_consume_skb);
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