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dccp: Lockless integration of CCID congestion-control plugins

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Based on Arnaldo's earlier patch, this patch integrates the standardised
CCID congestion control plugins (CCID-2 and CCID-3) of DCCP with dccp.ko:

 * enables a faster connection path by eliminating the need to always go 
   through the CCID registration lock;

 * updates the implementation to use only a single array whose size equals
   the number of configured CCIDs instead of the maximum (256);

 * since the CCIDs are now fixed array elements, synchronization is no
   longer needed, simplifying use and implementation.

CCID-2 is suggested as minimum for a basic DCCP implementation (RFC 4340, 10);
CCID-3 is a standards-track CCID supported by RFC 4342 and RFC 5348.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2009-01-04 21:42:53 -08:00 • committed by David S. Miller
parent 6ea2fde13a
commit ddebc973c5
11 changed files with 148 additions and 168 deletions
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7
net/dccp/proto.c
View file

@ -1118,9 +1118,15 @@ static int __init dccp_init(void)
if (rc)
goto out_ackvec_exit;
rc = ccid_initialize_builtins();
if (rc)
goto out_sysctl_exit;
dccp_timestamping_init();
out:
return rc;
out_sysctl_exit:
dccp_sysctl_exit();
out_ackvec_exit:
dccp_ackvec_exit();
out_free_dccp_mib:
@ -1143,6 +1149,7 @@ out_free_percpu:
static void __exit dccp_fini(void)
{
ccid_cleanup_builtins();
dccp_mib_exit();
free_pages((unsigned long)dccp_hashinfo.bhash,
get_order(dccp_hashinfo.bhash_size *