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authorEric W. Biederman <ebiederm@xmission.com>2014-04-01 12:20:24 -0700
committerDavid S. Miller <davem@davemloft.net>2014-04-01 17:53:36 -0400
commit574f7194f693cd80de96a39f0c43dbb346c38a15 (patch)
treee4a288169c3df023a77a70bc2538da2f3148792e /include
parentf91ca783f11029940aa60a9a5aad4dce666e6414 (diff)
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: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 31edf63937a..350eebe770d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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;