netdev - [PATCH v2 01/46] net: introduce __netdev_alloc_skb

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Message-Id: <ae7b531c89a01a21e4374907b69f4d997c9d5d1b.1310339688.git.mirq-linux@rere.qmqm.pl>
Date:	Mon, 11 Jul 2011 02:52:46 +0200 (CEST)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	netdev@...r.kernel.org
Subject: [PATCH v2 01/46] net: introduce __netdev_alloc_skb_aligned()

Introduce __netdev_alloc_skb_aligned() to return skb with skb->data
aligned at specified 2^n multiple.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 include/linux/skbuff.h |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 32ada53..c873897 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1561,6 +1561,33 @@ extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
 		unsigned int length, gfp_t gfp_mask);
 
 /**
+ *	__netdev_alloc_skb_aligned - allocate an skbuff for rx on a specific device
+ *	@dev: network device to receive on
+ *	@length: length to allocate
+ *	@align: required skb->data alignment
+ *	@gfp_mask: get_free_pages mask, passed to alloc_skb
+ *
+ *	Allocate a new &sk_buff and assign it a usage count of one. The
+ *	buffer has unspecified headroom built in. Users should allocate
+ *	the headroom they think they need without accounting for the
+ *	built in space. The built in space is used for optimisations.
+ *
+ *	%NULL is returned if there is no free memory.
+ */
+static inline struct sk_buff *__netdev_alloc_skb_aligned(struct net_device *dev,
+		unsigned int length, unsigned int align, gfp_t gfp_mask)
+{
+	struct sk_buff *skb;
+
+	skb = __alloc_skb(length + NET_SKB_PAD + align, gfp_mask, 0, NUMA_NO_NODE);
+	if (likely(skb)) {
+		skb_reserve(skb, PTR_ALIGN(skb->data + NET_SKB_PAD, align) - skb->data);
+		skb->dev = dev;
+	}
+	return skb;
+}
+
+/**
  *	netdev_alloc_skb - allocate an skbuff for rx on a specific device
  *	@dev: network device to receive on
  *	@length: length to allocate
-- 
1.7.5.4

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