diff options
| author |   Jesper Dangaard Brouer <brouer@redhat.com> | 2016-02-08 13:15:04 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-02-11 11:59:09 -0500 |
| commit | 15fad714be86eab13e7568fecaf475b2a9730d3e (patch) | |
| tree | 08fa26b84fab14cb2a58b3a01599ffd513d28ba9 /include/linux/skbuff.h | |
| parent | net: bulk free infrastructure for NAPI context, use napi_consume_skb (diff) | |
| download | linux-dev-15fad714be86eab13e7568fecaf475b2a9730d3e.tar.xz linux-dev-15fad714be86eab13e7568fecaf475b2a9730d3e.zip | |
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>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index b56c0103fa15..6ec86f1a2ed9 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2407,6 +2407,7 @@ static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi, 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 |