net: Infrastructure for checksum unnecessary conversions

[firefly-linux-kernel-4.4.55.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 23710a243439b19e1c21fec09ba5ed55522198cf..02529fcad1ac2bee14680c17e539e10abe472d2c 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2942,6 +2942,26 @@ static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto)
 #define skb_checksum_simple_validate(skb)                              \
        __skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo)
 
+static inline bool __skb_checksum_convert_check(struct sk_buff *skb)
+{
+       return (skb->ip_summed == CHECKSUM_NONE &&
+               skb->csum_valid && !skb->csum_bad);
+}
+
+static inline void __skb_checksum_convert(struct sk_buff *skb,
+                                         __sum16 check, __wsum pseudo)
+{
+       skb->csum = ~pseudo;
+       skb->ip_summed = CHECKSUM_COMPLETE;
+}
+
+#define skb_checksum_try_convert(skb, proto, check, compute_pseudo)    \
+do {                                                                   \
+       if (__skb_checksum_convert_check(skb))                          \
+               __skb_checksum_convert(skb, check,                      \
+                                      compute_pseudo(skb, proto));     \
+} while (0)
+
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 void nf_conntrack_destroy(struct nf_conntrack *nfct);
 static inline void nf_conntrack_put(struct nf_conntrack *nfct)