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| author | Vijay Subramanian <subramanian.vijay@gmail.com> | 2014-10-02 10:00:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-04 20:34:25 -0400 |
| commit | c8753d55afb436fd6a25c8bbe8d783f6dcf1c9f8 (patch) | |
| tree | 4d0cffb662c877a9a15bdf7bb84f2db35f4c33ec /net | |
| parent | 9fab426de78140dc5cb0b85bbee6042c9c3d5ca5 (diff) | |
| download | talos-obmc-linux-c8753d55afb436fd6a25c8bbe8d783f6dcf1c9f8.tar.gz talos-obmc-linux-c8753d55afb436fd6a25c8bbe8d783f6dcf1c9f8.zip | |
net: Cleanup skb cloning by adding SKB_FCLONE_FREE
SKB_FCLONE_UNAVAILABLE has overloaded meaning depending on type of skb.
1: If skb is allocated from head_cache, it indicates fclone is not available.
2: If skb is a companion fclone skb (allocated from fclone_cache), it indicates
it is available to be used.
To avoid confusion for case 2 above, this patch replaces
SKB_FCLONE_UNAVAILABLE with SKB_FCLONE_FREE where appropriate. For fclone
companion skbs, this indicates it is free for use.
SKB_FCLONE_UNAVAILABLE will now simply indicate skb is from head_cache and
cannot / will not have a companion fclone.
Signed-off-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/skbuff.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index a0b312fa3047..28916e47f959 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -265,7 +265,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, skb->fclone = SKB_FCLONE_ORIG; atomic_set(&fclones->fclone_ref, 1); - fclones->skb2.fclone = SKB_FCLONE_UNAVAILABLE; + fclones->skb2.fclone = SKB_FCLONE_FREE; fclones->skb2.pfmemalloc = pfmemalloc; } out: @@ -542,7 +542,7 @@ static void kfree_skbmem(struct sk_buff *skb) fclones = container_of(skb, struct sk_buff_fclones, skb2); /* Warning : We must perform the atomic_dec_and_test() before - * setting skb->fclone back to SKB_FCLONE_UNAVAILABLE, otherwise + * setting skb->fclone back to SKB_FCLONE_FREE, otherwise * skb_clone() could set clone_ref to 2 before our decrement. * Anyway, if we are going to free the structure, no need to * rewrite skb->fclone. @@ -553,7 +553,7 @@ static void kfree_skbmem(struct sk_buff *skb) /* The clone portion is available for * fast-cloning again. */ - skb->fclone = SKB_FCLONE_UNAVAILABLE; + skb->fclone = SKB_FCLONE_FREE; } break; } @@ -874,7 +874,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask) return NULL; if (skb->fclone == SKB_FCLONE_ORIG && - n->fclone == SKB_FCLONE_UNAVAILABLE) { + n->fclone == SKB_FCLONE_FREE) { n->fclone = SKB_FCLONE_CLONE; /* As our fastclone was free, clone_ref must be 1 at this point. * We could use atomic_inc() here, but it is faster |
