From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: [PATCHv2-RFC 1/6] skbuff: add an api to orphan frags Date: Thu, 17 May 2012 00:15:55 +0300 Message-ID: <11324c9708a8ca6b4f76b7092ab730b83c65575c.1337202879.git.mst@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jason Wang , eric.dumazet@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com, davem@davemloft.net To: "Michael S. Tsirkin" Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 --- 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 bb47314..2c5c69d 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1665,6 +1665,22 @@ 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 * -- MST