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authorShirley Ma <mashirle@us.ibm.com>2011-07-06 16:22:12 +0400
committerDavid S. Miller <davem@davemloft.net>2011-07-07 15:41:13 +0400
commita6686f2f382b13f8a7253401a66690c3633b6a74 (patch)
tree36a9a4546163a3c5b9a9ab3daa3b6bbe34af55aa /include/linux/skbuff.h
parent1cdebb423202e255366a321814fc6df079802a0d (diff)
downloadlinux-a6686f2f382b13f8a7253401a66690c3633b6a74.tar.xz
skbuff: skb supports zero-copy buffers
This patch adds userspace buffers support in skb shared info. A new struct skb_ubuf_info is needed to maintain the userspace buffers argument and index, a callback is used to notify userspace to release the buffers once lower device has done DMA (Last reference to that skb has gone). If there is any userspace apps to reference these userspace buffers, then these userspaces buffers will be copied into kernel. This way we can prevent userspace apps from holding these userspace buffers too long. Use destructor_arg to point to the userspace buffer info; a new tx flags SKBTX_DEV_ZEROCOPY is added for zero-copy buffer check. Signed-off-by: Shirley Ma <xma@...ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3e543371254e..08d4507715f5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -187,6 +187,20 @@ enum {
/* ensure the originating sk reference is available on driver level */
SKBTX_DRV_NEEDS_SK_REF = 1 << 3,
+
+ /* device driver supports TX zero-copy buffers */
+ SKBTX_DEV_ZEROCOPY = 1 << 4,
+};
+
+/*
+ * The callback notifies userspace to release buffers when skb DMA is done in
+ * lower device, the skb last reference should be 0 when calling this.
+ * The desc is used to track userspace buffer index.
+ */
+struct ubuf_info {
+ void (*callback)(void *);
+ void *arg;
+ unsigned long desc;
};
/* This data is invariant across clones and lives at
@@ -211,6 +225,7 @@ struct skb_shared_info {
/* Intermediate layers must ensure that destructor_arg
* remains valid until skb destructor */
void * destructor_arg;
+
/* must be last field, see pskb_expand_head() */
skb_frag_t frags[MAX_SKB_FRAGS];
};
@@ -2265,5 +2280,6 @@ static inline void skb_checksum_none_assert(struct sk_buff *skb)
}
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */