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sk_buff: track dst status in slow_gro

Browse source 
Similar to the previous patch, but covering the dst field:
the slow_gro flag is additionally set when a dst is attached
to the skb

RFC -> v1:
 - use the existing flag instead of adding a new one

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-07-28 18:24:00 +02:00 committed by David S. Miller
parent 5fc88f93ed
commit 8a886b142b
2 changed files with 4 additions and 0 deletions
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2
include/linux/skbuff.h
View file

@ -992,6 +992,7 @@ static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
*/
static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
{
skb->slow_gro |= !!dst;
skb->_skb_refdst = (unsigned long)dst;
}
@ -1008,6 +1009,7 @@ static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst)
{
WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
skb->slow_gro = !!dst;
skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF;
}

2
include/net/dst.h
View file

@ -277,6 +277,7 @@ static inline void skb_dst_drop(struct sk_buff *skb)
static inline void __skb_dst_copy(struct sk_buff *nskb, unsigned long refdst)
{
nskb->slow_gro |= !!refdst;
nskb->_skb_refdst = refdst;
if (!(nskb->_skb_refdst & SKB_DST_NOREF))
dst_clone(skb_dst(nskb));
@ -316,6 +317,7 @@ static inline bool skb_dst_force(struct sk_buff *skb)
dst = NULL;
skb->_skb_refdst = (unsigned long)dst;
skb->slow_gro |= !!dst;
}
return skb->_skb_refdst != 0UL;