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Commit 574f7194 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by David S. Miller
Browse files

net: Add a test to see if a skb is freeable in irq context 



Currently netpoll and skb_release_head_state assume that a skb is
freeable in hard irq context except when skb->destructor is set.

The reality is far from this.  So add a function skb_irq_freeable to
compute the full test and in the process be the living documentation
of what the requirements are of actually freeing a skb in hard irq
context.

Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f91ca783

include/linux/skbuff.h

+13 −0
Original line number Diff line number Diff line
@@ -2831,6 +2831,19 @@ static inline void skb_init_secmark(struct sk_buff *skb) 
{ }

#endif



static inline bool skb_irq_freeable(const struct sk_buff *skb)

{

	return !skb->destructor &&

#if IS_ENABLED(CONFIG_XFRM)

		!skb->sp &&

#endif

#if IS_ENABLED(CONFIG_NF_CONNTRACK)

		!skb->nfct &&

#endif

		!skb->_skb_refdst &&

		!skb_has_frag_list(skb);

}



static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)

{

	skb->queue_mapping = queue_mapping;