Routing enhancement - reduce routing table locking

[Ingo Flaschberger]

Hi,

> kern/155772 can be resolved using RADIX_MPATH.
>
>>
>> regarding kern/155772:
>> at stock 8.2 FreeBSD the system panics after ifconfig down / ifconfig up /
>> ifconfig down with 1 route and 1 interface route (multipath).
>>
>
>  What's the exact step and a specific example that triggers a panic ?


ifconfig em0 192.168.0.1/24
ifconfig em1 10.0.0.1/24
route add 10.0.0.0/24 192.168.0.2

ifconfig em1 down
// see that route is still there
ifconfig em1 up
ifconfig em1 down
*bum*

see:
kern/150481

and:
sys/netinet/in.c : in_ifinit

as I have updated my code now from 8.1 to 8.2 and had again - this 
crashes - and really was surprised that this patch has not found it's way 
into 8.2

thats also why I stated this bus is 13 years old...

>>
>> Also there are problems with arp, due wrong multipath route selection
>> (if the decision is already made that the route should go the direct way,
>>  the route and not the interface route is choosen, depends on which route
>>  was first in the tree).
>>
>
>  I am not quite getting what you are saying about.  What do you mean when
>  you say:" .. the route should go the direct way, the route and not the interface route ..."
>
>  What is the "route" that "goes the direct way" ?
>
>> And finally, there are problems when adding / deleteing routes.
>>
>> example that does not work:
>> ifconfig em0 192.168.0.1/24
>> ifconfig em1 10.0.0.1/24
>> route add 10.0.0.0/24 192.168.0.2
>>
>
>  What doesn't work ?  The add or the delete operation?
>  I can add and delete the 10.0.0.0/24 route fine on my system.

try the attached script.

bye,
 	Ingo