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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-12-12 17:06:14 +0100
committerDavid S. Miller <davem@davemloft.net>2008-01-28 23:57:20 +0100
commit954c2db868ce896325dced91d5fba5e2226897a4 (patch)
treed74b480530878c25eb770293d786f2e78ace90e7 /net/dccp/dccp.h
parent[TFRC]: CCID3 (and CCID4) needs to access these inlines (diff)
downloadlinux-954c2db868ce896325dced91d5fba5e2226897a4.tar.xz
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[CCID3]: Interface CCID3 code with newer Loss Intervals Database
This hooks up the TFRC Loss Interval database with CCID 3 packet reception. In addition, it makes the CCID-specific computation of the first loss interval (which requires access to all the guts of CCID3) local to ccid3.c. The patch also fixes an omission in the DCCP code, that of a default / fallback RTT value (defined in section 3.4 of RFC 4340 as 0.2 sec); while at it, the upper bound of 4 seconds for an RTT sample has been reduced to match the initial TCP RTO value of 3 seconds from[RFC 1122, 4.2.3.1]. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/dccp.h')
-rw-r--r--net/dccp/dccp.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index f4a5ea116e34..07dcbe73b50c 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -74,9 +74,12 @@ extern void dccp_time_wait(struct sock *sk, int state, int timeo);
#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
-/* bounds for sampled RTT values from packet exchanges (in usec) */
+/*
+ * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
+ */
#define DCCP_SANE_RTT_MIN 100
-#define DCCP_SANE_RTT_MAX (4 * USEC_PER_SEC)
+#define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5)
+#define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC)
/* Maximal interval between probes for local resources. */
#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))