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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 seq_window = 100
The initial sequence window (sec. 7.5.2) of the sender. This influences 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). 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 tx_qlen = 5
The size of the transmit buffer in packets. A value of 0 corresponds 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 */ /* Boundary values */
static int zero = 0, static int zero = 0,
u8_max = 0xFF; 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[] = { static struct ctl_table dccp_default_table[] = {
{ {
@ -31,6 +32,7 @@ static struct ctl_table dccp_default_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_doulongvec_minmax, .proc_handler = proc_doulongvec_minmax,
.extra1 = &seqw_min, /* RFC 4340, 7.5.2 */ .extra1 = &seqw_min, /* RFC 4340, 7.5.2 */
.extra2 = &seqw_max,
}, },
{ {
.procname = "rx_ccid", .procname = "rx_ccid",