Merge us.ibm.com:/home/sridhar/BK/linux-2.5.62

into us.ibm.com:/home/sridhar/BK/lksctp-2.5.62

1 files changed, 59 insertions, 37 deletions

diff --git a/include/net/sctp/tsnmap.h b/include/net/sctp/tsnmap.h
index af775264a785..70bea4ce1a98 100644
--- a/include/net/sctp/tsnmap.h
+++ b/include/net/sctp/tsnmap.h
@@ -1,35 +1,35 @@
 /* SCTP kernel reference Implementation Copyright (C) 1999-2001
  * Cisco, Motorola, Intel, and International Business Machines Corp.
- * 
+ *
  * This file is part of the SCTP kernel reference Implementation
- * 
+ *
  * These are the definitions needed for the tsnmap type.  The tsnmap is used
  * to track out of order TSNs received.
- * 
- * The SCTP reference implementation  is free software; 
- * you can redistribute it and/or modify it under the terms of 
+ *
+ * The SCTP reference implementation  is free software;
+ * you can redistribute it and/or modify it under the terms of
  * the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
- * 
- * the SCTP reference implementation  is distributed in the hope that it 
+ *
+ * the SCTP reference implementation  is distributed in the hope that it
  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  *                 ************************
  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  * See the GNU General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU General Public License
  * along with GNU CC; see the file COPYING.  If not, write to
  * the Free Software Foundation, 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.  
- * 
+ * Boston, MA 02111-1307, USA.
+ *
  * Please send any bug reports or fixes you make to one of the
  * following email addresses:
- * 
+ *
  * Jon Grimm <jgrimm@us.ibm.com>
  * La Monte H.P. Yarroll <piggy@acm.org>
  * Karl Knutson <karl@athena.chicago.il.us>
- * 
+ *
  * Any bugs reported given to us we will try to fix... any fixes shared will
  * be incorporated into the next SCTP release.
  */
@@ -38,8 +38,6 @@
 #ifndef __sctp_tsnmap_h__
 #define __sctp_tsnmap_h__
 
-
-
 /* RFC 2960 12.2 Parameters necessary per association (i.e. the TCB)
  * Mapping  An array of bits or bytes indicating which out of
  * Array    order TSN's have been received (relative to the
@@ -48,9 +46,7 @@
  *          will be set to all zero. This structure may be
  *          in the form of a circular buffer or bit array.
  */
-typedef struct sctp_tsnmap {
-
-
+struct sctp_tsnmap {
 	/* This array counts the number of chunks with each TSN.
 	 * It points at one of the two buffers with which we will
 	 * ping-pong between.
@@ -93,25 +89,30 @@ typedef struct sctp_tsnmap {
 	/* This is the highest TSN we've marked.  */
 	__u32 max_tsn_seen;
 
-	/* No. of data chunks pending receipt. used by SCTP_STATUS sockopt */
+	/* Data chunks pending receipt. used by SCTP_STATUS sockopt */
 	__u16 pending_data;
 
+	/* We record duplicate TSNs here.  We clear this after
+	 * every SACK.  Store up to SCTP_MAX_DUP_TSNS worth of
+	 * information.
+	 */
+	__u32 dup_tsns[SCTP_MAX_DUP_TSNS];
+	__u16 num_dup_tsns;
+
 	int malloced;
 
 	__u8 raw_map[0];
-} sctp_tsnmap_t;
+};
 
-typedef struct sctp_tsnmap_iter {
+struct sctp_tsnmap_iter {
 	__u32 start;
-} sctp_tsnmap_iter_t;
-
+};
 
 /* Create a new tsnmap.  */
-sctp_tsnmap_t *sctp_tsnmap_new(__u16 len, __u32 initial_tsn,
-			       int priority);
+struct sctp_tsnmap *sctp_tsnmap_new(__u16 len, __u32 init_tsn, int priority);
 
 /* Dispose of a tsnmap.  */
-void sctp_tsnmap_free(sctp_tsnmap_t *map);
+void sctp_tsnmap_free(struct sctp_tsnmap *);
 
 /* This macro assists in creation of external storage for variable length
  * internal buffers.  We double allocate so the overflow map works.
@@ -119,9 +120,8 @@ void sctp_tsnmap_free(sctp_tsnmap_t *map);
 #define sctp_tsnmap_storage_size(count) (sizeof(__u8) * (count) * 2)
 
 /* Initialize a block of memory as a tsnmap.  */
-sctp_tsnmap_t *sctp_tsnmap_init(sctp_tsnmap_t *map, __u16 len, __u32 initial_tsn);
-
-
+struct sctp_tsnmap *sctp_tsnmap_init(struct sctp_tsnmap *, __u16 len,
+				     __u32 initial_tsn);
 
 /* Test the tracking state of this TSN.
  * Returns:
@@ -129,29 +129,51 @@ sctp_tsnmap_t *sctp_tsnmap_init(sctp_tsnmap_t *map, __u16 len, __u32 initial_tsn
  *  >0 if the TSN has been seen (duplicate)
  *  <0 if the TSN is invalid (too large to track)
  */
-int sctp_tsnmap_check(const sctp_tsnmap_t *map, __u32 tsn);
+int sctp_tsnmap_check(const struct sctp_tsnmap *, __u32 tsn);
 
 /* Mark this TSN as seen.  */
-void sctp_tsnmap_mark(sctp_tsnmap_t *map, __u32 tsn);
+void sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn);
 
 /* Retrieve the Cumulative TSN ACK Point.  */
-__u32 sctp_tsnmap_get_ctsn(const sctp_tsnmap_t *map);
+__u32 sctp_tsnmap_get_ctsn(const struct sctp_tsnmap *);
 
 /* Retrieve the highest TSN we've seen.  */
-__u32 sctp_tsnmap_get_max_tsn_seen(const sctp_tsnmap_t *map);
+__u32 sctp_tsnmap_get_max_tsn_seen(const struct sctp_tsnmap *);
+
+/* How many Duplicate TSNs are stored? */
+static inline __u16 sctp_tsnmap_num_dups(struct sctp_tsnmap *map)
+{
+	return map->num_dup_tsns;
+}
+
+/* Return pointer to duplicate tsn array as needed by SACK. */
+static inline __u32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map)
+{
+	map->num_dup_tsns = 0;
+	return map->dup_tsns;
+}
+
+/* Mark a duplicate TSN.  Note:  we limit how many we are willing to
+ * store and consequently report.
+ */
+static inline void sctp_tsnmap_mark_dup(struct sctp_tsnmap *map, __u32 tsn)
+{
+	if (map->num_dup_tsns < SCTP_MAX_DUP_TSNS)
+		map->dup_tsns[map->num_dup_tsns++] = tsn;
+}
 
 /* Is there a gap in the TSN map? */
-int sctp_tsnmap_has_gap(const sctp_tsnmap_t *map);
+int sctp_tsnmap_has_gap(const struct sctp_tsnmap *);
 
 /* Initialize a gap ack block interator from user-provided memory.  */
-void sctp_tsnmap_iter_init(const sctp_tsnmap_t *map, sctp_tsnmap_iter_t *iter);
+void sctp_tsnmap_iter_init(const struct sctp_tsnmap *,
+			   struct sctp_tsnmap_iter *);
 
 /* Get the next gap ack blocks.  We return 0 if there are no more
  * gap ack blocks.
  */
-int sctp_tsnmap_next_gap_ack(const sctp_tsnmap_t *map, sctp_tsnmap_iter_t *iter,
-			     __u16 *start, __u16 *end);
-
+int sctp_tsnmap_next_gap_ack(const struct sctp_tsnmap *,
+	struct sctp_tsnmap_iter *,__u16 *start, __u16 *end);
 
 #endif /* __sctp_tsnmap_h__ */