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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:30:19 +0200 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:45:32 +0200 |
| commit | 2faae5587f692fd5c79856ca4c4b90944ee0472a (patch) | |
| tree | 637536dff5a15b5196233f38066644d19f77f23e /net/dccp/feat.c | |
| parent | 4861a354430d2ea36847ef88086c7449b4f385b6 (diff) | |
| download | linux-2faae5587f692fd5c79856ca4c4b90944ee0472a.tar.bz2 | |
dccp ccid-2: Use feature-negotiation to report Ack Ratio changes
This uses the new feature-negotiation framework to signal Ack Ratio changes,
as required by RFC 4341, sec. 6.1.2.
This raises some problems for CCID-2 since it can at the moment not cope
gracefully with Ack Ratio of e.g. 2. A FIXME has thus been added which
reverts to the existing policy of bypassing the Ack Ratio sysctl.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Diffstat (limited to 'net/dccp/feat.c')
| -rw-r--r-- | net/dccp/feat.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/dccp/feat.c b/net/dccp/feat.c index c847c80d1b97..f94c7c9d1a7f 100644 --- a/net/dccp/feat.c +++ b/net/dccp/feat.c @@ -74,6 +74,18 @@ static int dccp_hdlr_seq_win(struct sock *sk, u64 seq_win, bool rx) static int dccp_hdlr_ack_ratio(struct sock *sk, u64 ratio, bool rx) { +#ifndef __CCID2_COPES_GRACEFULLY_WITH_DYNAMIC_ACK_RATIO_UPDATES__ + /* + * FIXME: This is required until several problems in the CCID-2 code are + * resolved. The CCID-2 code currently does not cope well; using dynamic + * Ack Ratios greater than 1 caused instabilities. These were manifest + * in hangups and long RTO timeouts (1...3 seconds). Until this has been + * stabilised, it is safer not to activate dynamic Ack Ratio changes. + */ + dccp_pr_debug("Not changing %s Ack Ratio from 1 to %u\n", + rx ? "RX" : "TX", (u16)ratio); + ratio = 1; +#endif if (rx) dccp_sk(sk)->dccps_r_ack_ratio = ratio; else |