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Commit bfbb2346 authored Jan 02, 2011 by Gerrit Renker

dccp: make upper bound for seq_window consistent on 32/64 bit

The 'seq_window' sysctl sets the initial value for the DCCP Sequence Window,
which may range from 32..2^46-1 (RFC 4340, 7.5.2). The patch sets the upper
bound consistently to 2^32-1 on both 32 and 64 bit systems, which should be
sufficient - with a RTT of 1sec and 1-byte packets, a seq_window of 2^32-1
corresponds to a link speed of 34 Gbps.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>

parent 763dadd4

Documentation/networking/dccp.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -167,6 +167,7 @@ rx_ccid = 2
		seq_window = 100
		The initial sequence window (sec. 7.5.2) of the sender. This influences
		the local ackno validity and the remote seqno validity windows (7.5.1).
		Values in the range Wmin = 32 (RFC 4340, 7.5.2) up to 2^32-1 can be set.

		tx_qlen = 5
		The size of the transmit buffer in packets. A value of 0 corresponds

net/dccp/sysctl.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -21,7 +21,8 @@
		/* Boundary values */
		static int zero = 0,
		u8_max = 0xFF;
		static unsigned long seqw_min = 32;
		static unsigned long seqw_min = DCCPF_SEQ_WMIN,
		seqw_max = 0xFFFFFFFF; /* maximum on 32 bit */

		static struct ctl_table dccp_default_table[] = {
		{
		@@ -31,6 +32,7 @@ static struct ctl_table dccp_default_table[] = {
		.mode = 0644,
		.proc_handler = proc_doulongvec_minmax,
		.extra1 = &seqw_min, /* RFC 4340, 7.5.2 */
		.extra2 = &seqw_max,
		},
		{
		.procname = "rx_ccid",