Xen users - Jul 2009 - Disabling checksum offloading at OSOL DomU via kmdb at intial boot.

Disabling checksum offloading at OSOL DomU via kmdb at intial boot :-
( -kd at extra line):-

root@ServerJaunty:/home/boris/nevada# xm create -c osol.install
Using config file "./osol.install".
Started domain osol.install (id=6)
                                  Loading kmdb...

Welcome to kmdb
Loaded modules: [ unix krtld genunix ]
[0]> ::bp xnf`_init
[0]> :c
v3.4.1-rc7 chgset ''Wed Jul 15 13:26:50 2009 +0100
19696:22ef8e900a6d''
SunOS Release 5.11 Version snv_111b 64-bit
Copyright 1983-2009 Sun Microsystems, Inc.  All rights reserved.
Use is subject to license terms.
Hostname: opensolaris
Remounting root read/write
Probing for device nodes ...
Loaded modules: [ scsi_vhci crypto mac neti xpv_psm ufs mpt zfs s1394 uhci hook 
ip usba specfs md random sctp arp emlxs sockfs xpv_uppc ]
kmdb: stop at xnf`_init
kmdb: target stopped at:
xnf`_init:      pushq  %rbp
[0]> xnf_cksum_offload/W 0
xnf`xnf_cksum_offload:          0x1             =       0x0
[0]> :c
Preparing live image for use
Done mounting Live image
USB keyboard
 1. Albanian                      23. Lithuanian                    
 2. Belarusian                    24. Latvian                       
 3. Belgian                       25. Macedonian                    
 4. Brazilian                     26. Malta_UK                      
 5. Bulgarian                     27. Malta_US                      
 6. Canadian-Bilingual            28. Norwegian                     
 7. Croatian                      29. Polish                        
 8. Czech                         30. Portuguese                    
 9. Danish                        31. Russian                       
10. Dutch                         32. Serbia-And-Montenegro         
11. Finnish                       33. Slovenian                     
12. French                        34. Slovakian                     
13. French-Canadian               35. Spanish                       
14. Hungarian                     36. Swedish                       
15. German                        37. Swiss-French                  
16. Greek                         38. Swiss-German                  
17. Icelandic                     39. Traditional-Chinese           
18. Italian                       40. TurkishQ                      
19. Japanese-type6                41. TurkishF                      
20. Japanese                      42. UK-English                    
21. Korean                        43. US-English                    
22. Latin-American                
To select the keyboard layout, enter a number [default 43]:

 1. Arabic                        
 2. Chinese - Simplified          
 3. Chinese - Traditional         
 4. Czech                         
 5. Dutch                         
 6. English                       
 7. French                        
 8. German                        
 9. Greek                         
10. Hebrew                        
11. Hungarian                     
12. Indonesian                    
13. Italian                       
14. Japanese                      
15. Korean                        
16. Polish                        
17. Portuguese - Brazil           
18. Russian                       
19. Slovak                        
20. Spanish                       
21. Swedish                       
To select desktop language, enter a number [default is 6]: 
User selected: English
Configuring devices.
Mounting cdroms
Reading ZFS config: done.

opensolaris console login: jack
Password: 
Sun Microsystems Inc.   SunOS 5.11      snv_111b        November 2008
jack@opensolaris:~$ Jul 19 03:18:29 opensolaris in.routed[786]: route 0.0.0.0/8
--> 0.0.0.0 nexthop is not directly connected

jack@opensolaris:~$ pfexec ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232
index 1
        inet 127.0.0.1 netmask ff000000 
xnf0: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500
index 2
        inet 192.168.1.35 netmask ffffff00 broadcast 192.168.1.255
        ether 0:16:3e:74:95:f 
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252
index 1
        inet6 ::1/128 
xnf0: flags=2004841<UP,RUNNING,MULTICAST,DHCP,IPv6> mtu 1500 index 2
        inet6 fe80::216:3eff:fe74:950f/10 
        ether 0:16:3e:74:95:f 
jack@opensolaris:~$ 

Before "REBOOT" drop to shell and modify /etc/system as suggested
before.
Boris.

--- On Sun, 7/19/09, Michael Ralston <michael@ralston.id.au> wrote:

From: Michael Ralston <michael@ralston.id.au>
Subject: [Xen-users] Opensolaris domU unable to get dhcp lease
To: xen-users@lists.xensource.com
Date: Sunday, July 19, 2009, 1:26 AM

I''m running a ubuntu 9.04 64 bit dom0 with kernel 2.6.29.6 and xen
3.4.0. My eth0 is bridged to br0 and to my guest VMs. The dom0 is
running a dhcp server on br0 which is able to provide leases to
physical machines on eth0, and also to a windows xp domU which is
bridged to br0. However my open solaris 2009.6 domU is unable to
obtain a dhcp lease.

On the opensolaris side I can see this:
michael@opensolaris:~$ pfexec ifconfig xnf0 dhcp start
ifconfig: xnf0: wait timed out, operation still pending...

With tcpdump I can see the dhcp request coming in br0, but no dhcp
offer going back out.

In the syslog of my dom0 I can see this when the opensolaris domU
requests a lease:
==> syslog <=Jul 19 15:20:03 allendale dhcpd: 19 bad udp checksums in 37
packets


This also occurs with xen 3.3.0

Anyone had a similar problem? Any ideas what could be causing this?

-- Michael

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