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| author | Michael S. Tsirkin <mst@redhat.com> | 2012-07-20 09:23:07 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-07-11 13:33:59 +0100 |
| commit | dc4f7b1edb525ee356abc0f7ef96550dcd0a3d4c (patch) | |
| tree | 0a7adf96deb5efbc18d209bb0064a5e9c5864398 | |
| parent | a0eb191eff753e790def174b3fbe66efadfd401d (diff) | |
| download | lwn-dc4f7b1edb525ee356abc0f7ef96550dcd0a3d4c.tar.gz lwn-dc4f7b1edb525ee356abc0f7ef96550dcd0a3d4c.zip | |
skbuff: add an api to orphan frags
commit a353e0ce0fd42d8859260666d1e9b10f2abd4698 upstream.
Many places do
if ((skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY))
skb_copy_ubufs(skb, gfp_mask);
to copy and invoke frag destructors if necessary.
Add an inline helper for this.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | include/linux/skbuff.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c445e5221d49..40c2726709b5 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1633,6 +1633,22 @@ static inline void skb_orphan(struct sk_buff *skb) } /** + * skb_orphan_frags - orphan the frags contained in a buffer + * @skb: buffer to orphan frags from + * @gfp_mask: allocation mask for replacement pages + * + * For each frag in the SKB which needs a destructor (i.e. has an + * owner) create a copy of that frag and release the original + * page by calling the destructor. + */ +static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask) +{ + if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY))) + return 0; + return skb_copy_ubufs(skb, gfp_mask); +} + +/** * __skb_queue_purge - empty a list * @list: list to empty * |