iscsi tools: manage qla4xxx iscsi sessions with iscsiadm

iscsi tools: manage qla4xxx iscsi sessions with iscsiadm

This patch is based on initial work done by Mike Christie here,
http://groups.google.com/group/open-iscsi/browse_thread/thread/193fe9037f3127da#

This patch modifies iscsiadm so it can control sessions that are
accessed
through qla4xxx.

To do discovery using the qla4xxx iscsi class interface first check the
available qla4xxx iface

./iscsiadm -m iface -P 0

will display the different ifaces like this:

qla4xxx.00:0e:1e:04:87:fa qla4xxx,00:0e:1e:04:87:fa,192.168.1.112,\
            <empty>,<empty>
qla4xxx.00:0e:1e:04:87:fe
qla4xxx,00:0e:1e:04:87:fe,<empty>,<empty>,<empty>

Issue discovery command
./iscsiadm -m discovery -t sendtargets -I qla4xxx.00:0e:1e:04:87:fa \
                                           -p 192.168.1.10:3260
192.168.1.10:3260,1 iqn.2001-05.com.target:0-7d76ca2b7d54b541-disk2
192.168.1.10:3260,1 iqn.2001-05.com.target:0-46f6ca2b7d84b541-disk3
192.168.1.10:3260,1 iqn.2001-05.com.target:0-4c76ca2b7db4b541-disk4
192.168.1.10:3260,1 iqn.2001-05.com.target:0-7346ca2b6d04b6bb-disk1

To view discovered nodes do

./iscsiadm -m node

To login

./iscsiadm -m node -T iqn.2001-05.com.target:0-7346ca2b6d04b6bb-disk1 \
   -I qla4xxx.00:0e:1e:04:87:fa -p 192.168.1.10:3260 -l

An error or ok message is displayed to indicate login failure or
success.

To see the sessions use

./iscsiadm -m session

And then to logout do

./iscsiadm -m node -T iqn.2001-05.com.target:0-7346ca2b6d04b6bb-disk1 \
    -I qla4xxx.00:0e:1e:04:87:fa -p 192.168.1.10:3260 -u

An error or a ok message is displayed to indicate logout failure or
success.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>