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-rw-r--r--include/linux/skbuff.h20
1 files changed, 17 insertions, 3 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 33370271b8b2..775292a66fa4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -238,11 +238,12 @@ enum {
/*
* 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.
+ * The ctx field is used to track device context.
+ * The desc field is used to track userspace buffer index.
*/
struct ubuf_info {
- void (*callback)(void *);
- void *arg;
+ void (*callback)(struct ubuf_info *);
+ void *ctx;
unsigned long desc;
};
@@ -481,6 +482,7 @@ struct sk_buff {
union {
__u32 mark;
__u32 dropcount;
+ __u32 avail_size;
};
sk_buff_data_t transport_header;
@@ -1366,6 +1368,18 @@ static inline int skb_tailroom(const struct sk_buff *skb)
}
/**
+ * skb_availroom - bytes at buffer end
+ * @skb: buffer to check
+ *
+ * Return the number of bytes of free space at the tail of an sk_buff
+ * allocated by sk_stream_alloc()
+ */
+static inline int skb_availroom(const struct sk_buff *skb)
+{
+ return skb_is_nonlinear(skb) ? 0 : skb->avail_size - skb->len;
+}
+
+/**
* skb_reserve - adjust headroom
* @skb: buffer to alter
* @len: bytes to move