RE: [Ltib] Linux iSCSI over Ethernet

[Reer, Carolyn (SA-1)]

Just wanted to update everyone on this problem.

 

I could not build the STGT TGTD iSCSI Target daemon to run on the Freescale MPC8536DS.

Whenever the administrator tool ‘tgtadm’ sent a command to the target, ‘tgtd’ would crash.

Everything worked fine on the Fedora 12 running on a Pentium laptop.

 

I isolated the problem to the 2.6.28.1 ‘strtok’ function.

TGTD calls tgt_device_create(tid, TYPE_RAID, 0, NULL, 0); //NULL Pointer

Which in turn calls ‘strtok’ with a NULL pointer.

Linux 2.6.31.5-127.fc12.i686 can handle a NULL pointer being passed to ‘strtok’ but 2.6.28.1 ppc GNU/Linux crashes.

The solution was simply to wrap the ‘strtok’ while loop in: if(Pointer) { }

 

 The TGTD code was downloaded from here:

http://stgt.sourceforge.net/

 

Carolyn Reer

From: address@hidden [mailto:address@hidden On Behalf Of Reer, Carolyn (SA-1)
Sent: Wednesday, August 11, 2010 4:44 PM
To: address@hidden
Subject: [Ltib] Linux iSCSI over Ethernet

 

Has anyone ever run an iSCSI target on a Freescale MPC8536?

I have 2.6.38.1 kernel GNU/Linux running on MPC8536DS Power PC.

I downloaded STGT_iSCSI_Target from http://stgt.sourceforge.net/ and built for MPC8536 via make ISCSI=1.

TGTD runs on the target PPC but crashes when I send commands from tgtadm.

‘./tgtd –iscsi portal=192.168.1.100:3260’ causes 2 tgtd PIDs (2261 & 262) to be created.

I can do a ‘./usr/tgtadm --lld iscsi --mode target --op show’; PIDs and netstat show tgtd PIDs there and listening.

 

But once I try 'new' command, The original listening PID 2261 is gone and PID 2262 is now listening

 "./usr/tgtadm --lld iscsi --mode target --op new --tid=1 --targetname iqn.2009-02.com.example:for.all"

 tgtadm: tgtd closed the socket

 

I rebuilt for the x86 Fedora 12 laptop and tgtd & tgtadm run & interact OK. Original PIDs are there.

 

In addition I created a LVM on the host and the host/rootfs via

‘dd if=/dev/zero of=/tmp/iscsi-disk1 bs=1M count=256’

I was able to create the LUN on the Fedora. But can’t do anything on the PPC.

 

Thanks for any help.

 

Carolyn Reer