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>
void napi_consume_skb(struct sk_buff *skb, int budget);
void __kfree_skb_flush(void);
+void __kfree_skb_defer(struct sk_buff *skb);
/**
* __dev_alloc_pages - allocate page for network Rx
trace_consume_skb(skb);
else
trace_kfree_skb(skb, net_tx_action);
- __kfree_skb(skb);
+
+ if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
+ __kfree_skb(skb);
+ else
+ __kfree_skb_defer(skb);
}
+
+ __kfree_skb_flush();
}
if (sd->output_queue) {
}
}
-static void __kfree_skb_defer(struct sk_buff *skb)
+static inline void _kfree_skb_defer(struct sk_buff *skb)
{
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
nc->skb_count = 0;
}
}
+void __kfree_skb_defer(struct sk_buff *skb)
+{
+ _kfree_skb_defer(skb);
+}
void napi_consume_skb(struct sk_buff *skb, int budget)
{
return;
}
- __kfree_skb_defer(skb);
+ _kfree_skb_defer(skb);
}
EXPORT_SYMBOL(napi_consume_skb);