On Wed, 21 Nov 2007, Bjoern A. Zeeb wrote:
bz 2007-11-21 22:30:14 UTC
FreeBSD src repository
Modified files:
sys/netinet tcp_output.c
Log:
Make TSO work with IPSEC compiled into the kernel.
The lookup hurts a bit for connections but had been there anyway
if IPSEC was compiled in. So moving the lookup up a bit gives us
TSO support at not extra cost.
PR: kern/115586
Tested by: gallatin
Discussed with: kmacy
MFC after: 2 months
Revision Changes Path
1.143 +16 -3 src/sys/netinet/tcp_output.c
Remarks:
* There is an edge case that has not been and is not addressed by this commit:
in case memory allocation fails in ipsec_hdrsiz_tcp() we return 0 and
enable TSO anyway. Also ipoptlen calculation would be wrong if the proper
lookup would have shown that we will do IPsec processing.
* ipsec?_hdrsiz() in the call path from ipsec_hdrsiz_tcp()
still has an XXX comment 'if we should panic in case no IPSEC processing
is needed'. That was never enforced and the comment should probably be
removed as there have not been and are no checks if IPsec processing is
needed before this (else we would not need to do the lookup here).
* We should see if we can find a shortcut to check if IPsec processing
is needed to not hurt connections that much in case IPSEC is compiled
in but there are no policies or ipsec would "not be enabled".
Future IPSec work should keep that in mind. (Discussed with sam and rwatson)
--
Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT
Software is harder than hardware so better get it right the first time.
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