aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorThomas Graf <tgraf@suug.ch>2005-06-23 20:59:51 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-23 20:59:51 -0700
commit677e90eda3bd8cfde0b748daaa46476162a03950 (patch)
tree4b40614cf9cd125883d0430467be9172997ca184 /include
parent6408f79cce401e1bfecf923e7156f84f96e021e3 (diff)
[NET]: Zerocopy sequential reading of skb data
Implements sequential reading for both linear and non-linear skb data at zerocopy cost. The data is returned in chunks of arbitary length, therefore random access is not possible. Usage: from := 0 to := 128 state := undef data := undef len := undef consumed := 0 skb_prepare_seq_read(skb, from, to, &state) while (len = skb_seq_read(consumed, &data, &state)) != 0 do /* do something with 'data' of length 'len' */ if abort then /* abort read if we don't wait for * skb_seq_read() to return 0 */ skb_abort_seq_read(&state) return endif /* not necessary to consume all of 'len' */ consumed += len done Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d7c839a2184..171a37dff83 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -321,6 +321,24 @@ extern void skb_over_panic(struct sk_buff *skb, int len,
extern void skb_under_panic(struct sk_buff *skb, int len,
void *here);
+struct skb_seq_state
+{
+ __u32 lower_offset;
+ __u32 upper_offset;
+ __u32 frag_idx;
+ __u32 stepped_offset;
+ struct sk_buff *root_skb;
+ struct sk_buff *cur_skb;
+ __u8 *frag_data;
+};
+
+extern void skb_prepare_seq_read(struct sk_buff *skb,
+ unsigned int from, unsigned int to,
+ struct skb_seq_state *st);
+extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
+ struct skb_seq_state *st);
+extern void skb_abort_seq_read(struct skb_seq_state *st);
+
/* Internal */
#define skb_shinfo(SKB) ((struct skb_shared_info *)((SKB)->end))