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

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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>
This commit is contained in:
Gerrit Renker 2011-01-02 18:15:58 +01:00
parent 763dadd47c
commit bfbb23466a
2 changed files with 4 additions and 1 deletions
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1
Documentation/networking/dccp.txt
View File

@ -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

4
net/dccp/sysctl.c
View File

@ -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",