diff options
| author | Eric Dumazet <edumazet@google.com> | 2014-09-23 18:39:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-26 16:53:49 -0400 |
| commit | ff04a771ad25fc9ba91690e73465b4d34b6bf8b3 (patch) | |
| tree | 4d42ca1c4b28e84e35f8e4cad3ad277287c25cc8 /net/core | |
| parent | cec08315190a4461a369d47041a510d104a5d2a2 (diff) | |
| download | linux-ff04a771ad25fc9ba91690e73465b4d34b6bf8b3.tar.gz | |
net : optimize skb_release_data()
Cache skb_shinfo(skb) in a variable to avoid computing it multiple
times.
Reorganize the tests to remove one indentation level.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/skbuff.c | 43 |
1 files changed, 22 insertions, 21 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 512dc7dcbc32..d4fdc649112c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -491,32 +491,33 @@ static void skb_free_head(struct sk_buff *skb) static void skb_release_data(struct sk_buff *skb) { - if (!skb->cloned || - !atomic_sub_return(skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1, - &skb_shinfo(skb)->dataref)) { - if (skb_shinfo(skb)->nr_frags) { - int i; - for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) - skb_frag_unref(skb, i); - } + struct skb_shared_info *shinfo = skb_shinfo(skb); + int i; - /* - * If skb buf is from userspace, we need to notify the caller - * the lower device DMA has done; - */ - if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { - struct ubuf_info *uarg; + if (skb->cloned && + atomic_sub_return(skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1, + &shinfo->dataref)) + return; - uarg = skb_shinfo(skb)->destructor_arg; - if (uarg->callback) - uarg->callback(uarg, true); - } + for (i = 0; i < shinfo->nr_frags; i++) + __skb_frag_unref(&shinfo->frags[i]); - if (skb_has_frag_list(skb)) - skb_drop_fraglist(skb); + /* + * If skb buf is from userspace, we need to notify the caller + * the lower device DMA has done; + */ + if (shinfo->tx_flags & SKBTX_DEV_ZEROCOPY) { + struct ubuf_info *uarg; - skb_free_head(skb); + uarg = shinfo->destructor_arg; + if (uarg->callback) + uarg->callback(uarg, true); } + + if (shinfo->frag_list) + kfree_skb_list(shinfo->frag_list); + + skb_free_head(skb); } /* |