From 02015180e2509afd2e3fe3790a333b30708a116b Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Wed, 8 Oct 2008 14:19:01 -0700 Subject: [PATCH] sctp: shrink sctp_tsnmap some more by removing gabs array The gabs array in the sctp_tsnmap structure is only used in one place, sctp_make_sack(). As such, carrying the array around in the sctp_tsnmap and thus directly in the sctp_association is rather pointless since most of the time it's just taking up space. Now, let sctp_make_sack create and populate it and then throw it away when it's done. Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- include/net/sctp/tsnmap.h | 14 +++----------- net/sctp/sm_make_chunk.c | 6 ++++-- net/sctp/tsnmap.c | 15 ++++++++------- 3 files changed, 15 insertions(+), 20 deletions(-) diff --git a/include/net/sctp/tsnmap.h b/include/net/sctp/tsnmap.h index 6dabbee8bbd3..4aabc5a96cf6 100644 --- a/include/net/sctp/tsnmap.h +++ b/include/net/sctp/tsnmap.h @@ -94,11 +94,8 @@ struct sctp_tsnmap { * every SACK. Store up to SCTP_MAX_DUP_TSNS worth of * information. */ - __be32 dup_tsns[SCTP_MAX_DUP_TSNS]; __u16 num_dup_tsns; - - /* Record gap ack block information here. */ - struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; + __be32 dup_tsns[SCTP_MAX_DUP_TSNS]; }; struct sctp_tsnmap_iter { @@ -151,17 +148,12 @@ static inline __be32 *sctp_tsnmap_get_dups(struct sctp_tsnmap *map) } /* How many gap ack blocks do we have recorded? */ -__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map); +__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map, + struct sctp_gap_ack_block *gabs); /* Refresh the count on pending data. */ __u16 sctp_tsnmap_pending(struct sctp_tsnmap *map); -/* Return pointer to gap ack blocks as needed by SACK. */ -static inline struct sctp_gap_ack_block *sctp_tsnmap_get_gabs(struct sctp_tsnmap *map) -{ - return map->gabs; -} - /* Is there a gap in the TSN map? */ static inline int sctp_tsnmap_has_gap(const struct sctp_tsnmap *map) { diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 6dd9b3ef33d0..fd8acb48c3f2 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -702,12 +702,14 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) __u32 ctsn; __u16 num_gabs, num_dup_tsns; struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; + struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; + memset(gabs, 0, sizeof(gabs)); ctsn = sctp_tsnmap_get_ctsn(map); SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); /* How much room is needed in the chunk? */ - num_gabs = sctp_tsnmap_num_gabs(map); + num_gabs = sctp_tsnmap_num_gabs(map, gabs); num_dup_tsns = sctp_tsnmap_num_dups(map); /* Initialize the SACK header. */ @@ -763,7 +765,7 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) /* Add the gap ack block information. */ if (num_gabs) sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, - sctp_tsnmap_get_gabs(map)); + gabs); /* Add the duplicate TSN information. */ if (num_dup_tsns) diff --git a/net/sctp/tsnmap.c b/net/sctp/tsnmap.c index 142ed7ca424d..35c73e82553a 100644 --- a/net/sctp/tsnmap.c +++ b/net/sctp/tsnmap.c @@ -335,10 +335,11 @@ void sctp_tsnmap_renege(struct sctp_tsnmap *map, __u32 tsn) } /* How many gap ack blocks do we have recorded? */ -__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map) +__u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map, + struct sctp_gap_ack_block *gabs) { struct sctp_tsnmap_iter iter; - int gabs = 0; + int ngaps = 0; /* Refresh the gap ack information. */ if (sctp_tsnmap_has_gap(map)) { @@ -348,14 +349,14 @@ __u16 sctp_tsnmap_num_gabs(struct sctp_tsnmap *map) &start, &end)) { - map->gabs[gabs].start = htons(start); - map->gabs[gabs].end = htons(end); - gabs++; - if (gabs >= SCTP_MAX_GABS) + gabs[ngaps].start = htons(start); + gabs[ngaps].end = htons(end); + ngaps++; + if (ngaps >= SCTP_MAX_GABS) break; } } - return gabs; + return ngaps; } static int sctp_tsnmap_grow(struct sctp_tsnmap *map, u16 gap) -- 2.20.1