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net: add rb_to_skb() and other rb tree helpers

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Geeralize private netem_rb_to_skb()

TCP rtx queue will soon be converted to rb-tree,
so we will need skb_rbtree_walk() helpers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-10-05 22:21:21 -07:00
committed by David S. Miller
parent f5333f80c3
commit 18a4c0eab2
4 changed files with 37 additions and 36 deletions
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18
include/linux/skbuff.h
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@@ -3158,6 +3158,12 @@ static inline int __skb_grow_rcsum(struct sk_buff *skb, unsigned int len)
return __skb_grow(skb, len);
}
#define rb_to_skb(rb) rb_entry_safe(rb, struct sk_buff, rbnode)
#define skb_rb_first(root) rb_to_skb(rb_first(root))
#define skb_rb_last(root) rb_to_skb(rb_last(root))
#define skb_rb_next(skb) rb_to_skb(rb_next(&(skb)->rbnode))
#define skb_rb_prev(skb) rb_to_skb(rb_prev(&(skb)->rbnode))
#define skb_queue_walk(queue, skb) \
for (skb = (queue)->next; \
skb != (struct sk_buff *)(queue); \
@@ -3172,6 +3178,18 @@ static inline int __skb_grow_rcsum(struct sk_buff *skb, unsigned int len)
for (; skb != (struct sk_buff *)(queue); \
skb = skb->next)
#define skb_rbtree_walk(skb, root) \
for (skb = skb_rb_first(root); skb != NULL; \
skb = skb_rb_next(skb))
#define skb_rbtree_walk_from(skb) \
for (; skb != NULL; \
skb = skb_rb_next(skb))
#define skb_rbtree_walk_from_safe(skb, tmp) \
for (; tmp = skb ? skb_rb_next(skb) : NULL, (skb != NULL); \
skb = tmp)
#define skb_queue_walk_from_safe(queue, skb, tmp) \
for (tmp = skb->next; \
skb != (struct sk_buff *)(queue); \