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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2011-01-02 18:15:58 +0100 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2011-01-07 12:22:44 +0100 |
| commit | bfbb23466adcbc77facea3046b44f75530079472 (patch) | |
| tree | 31e28ac15e808861cd261e9600c4e7642d8aa73f | |
| parent | 763dadd47c884853a22f2f19ea27e58431303ff3 (diff) | |
| download | linux-3.10-bfbb23466adcbc77facea3046b44f75530079472.tar.gz linux-3.10-bfbb23466adcbc77facea3046b44f75530079472.tar.bz2 linux-3.10-bfbb23466adcbc77facea3046b44f75530079472.zip | |
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>
| -rw-r--r-- | Documentation/networking/dccp.txt | 1 | ||||
| -rw-r--r-- | net/dccp/sysctl.c | 4 |
2 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt index b395ca6a49f..811872b45be 100644 --- a/Documentation/networking/dccp.txt +++ b/Documentation/networking/dccp.txt @@ -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 diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c index 563943822e5..42348824ee3 100644 --- a/net/dccp/sysctl.c +++ b/net/dccp/sysctl.c @@ -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", |