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1. Current status:
Using iscsiadm one cannot do any network configuration for qla4xxx
adapters.
However an iface is created for the qla4xxx ports using the hwaddress.
\# ls /etc/iscsi/ifaces/
iface.example iface0 qla4xxx.00:0e:1e:04:8b:2a
qla4xxx.00:0e:1e:04:8b:2e
This allows user to issue sendtargets via the qla4xxx iscsi offload.
2. Current Proposal:
Current proposal is to allow iscsiadm to configure the network settings
for qla4xxx ports.
This implementation is based on discussions at
- http://marc.info/?l=linux-scsi&m=127066184916180&w=2
- http://groups.google.com/group/open-iscsi/browse_thread/thread/d8e8c2df71c95d69/8f731d95d46141a0?lnk=gst&q=iscsi+hba#
2.1 Changes in iscsiadm/iscsid
2.1.1 Add a new event: ISCSI_UEVENT_SET_IFACE_PARAMS
2.1.2 New structure/enum to represent a single network parameter
- enum iscsi_net_param;
- struct iscsi_iface_param_info;
2.1.3 Added new parameters in iface
2.1.4 Change in operations
Add two new operations to iscsiadm
apply: Apply the single iface settings
applyall: Apply the iface settings of all iface having the same MAC
address
2.2 Changes in sysfs network representation
The new sysfs directory would look like this:-
/sys/class/iscsi_iface/-|
_______________________|
|
|- ipv4-iface-<host_no>-<iface_no>/ <-- for ipv4
|- bootproto
|- enabled
|- ipaddress
|- subnet
|- gateway
|- mtu
|- port
|- vlan
|- vlan_enabled
|- vlan_priority
|- ipv6-iface-<host_no>-<iface_no>/ <-- for ipv6
|- enabled
|- ipaddr_autocfg
|- ipaddress
|- link_local_addr
|- linklocal_autocfg
|- mtu
|- port
|- router_addr
|- vlan
|- vlan_enabled
|- vlan_priority
3. Flow:
3.1 User space code:
- If user specify --op=update, then just update the iface
config file
- If use specify --op=applyall then ifaces for the host
passed in.
and build up the net config buffer.
- Note: If --op is "apply" then only settings for single
iface is read,
the iface provided with -I option is only read.
- The net config buffer will look like this.
----------------------------------------------------------------|
| iscsi_net_param { |
| iface_num = 0; |
| len = 4; |
| param = ISCSI_NET_PARAM_IPV4_ADDR; |
| iface_type = ISCSI_IFACE_TYPE_IPV4; |
| param_type = ISCSI_NET_PARAM; |
| value[0] = ipaddress[0]; |
| value[1] = ipaddress[1]; |
| value[2] = ipaddress[2]; |
| value[3] = ipaddress[3]; |
| } |
----------------------------------------------------------------|
| iscsi_net_param { |
| iface_num = 0; |
| len = 4; |
| param = ISCSI_NET_PARAM_IPV4_GW; |
| iface_type = ISCSI_IFACE_TYPE_IPV4; |
| param_type = ISCSI_NET_PARAM; |
| value[0] = ipgateway[0]; |
| value[1] = ipgateway[1]; |
| value[2] = ipgateway[2]; |
| value[3] = ipgateway[3]; |
| } |
-----------------------------------------------------------------
| |
| iscsi_net_param { |
| iface_num = 1; |
| len = 4; |
| param = ISCSI_NET_PARAM_IPV4_ADDR; |
| iface_type = ISCSI_IFACE_TYPE_IPV4; |
| param_type = ISCSI_NET_PARAM; |
| value[0] = ipaddress[0]; |
| value[1] = ipaddress[1]; |
| value[2] = ipaddress[2]; |
| value[3] = ipaddress[3]; |
| } |
-----------------------------------------------------------------
-----------------------------------------------------------------
| iscsi_net_param { |
| iface_num = 0; |
| len = 4; |
| param = ISCSI_NET_PARAM_IPV4_GW; |
| iface_type = ISCSI_IFACE_TYPE_IPV4; |
| param_type = ISCSI_NET_PARAM; |
| value[0] = ipgateway[0]; |
| value[1] = ipgateway[1]; |
| value[2] = ipgateway[2]; |
| value[3] = ipgateway[3]; |
| } |
-----------------------------------------------------------------
| iscsi_net_param { |
| iface_num = 1; |
| len = 1; |
| param = ISCSI_NET_PARAM_IFACE_ENABLED; |
| iface_type = ISCSI_IFACE_TYPE_IPV4; |
| param_type = ISCSI_NET_PARAM; |
| offset = 0; |
| value[0] = 0; /* 0 = disable, default = 1 = enable */ |
| } |
-----------------------------------------------------------------
Each netconfig parameter has different size requirement for value field.
e.g.: IPv4 address requires 4 bytes, IPv6 address requires 16 bytes etc.
The memory allocated for each netconfig parameter is size of
iscsi_net_param + length required for that parameter.
The multiple IO Vector mechanism is used to send netconfig
parameter from user space to kernel using Netlink interface.
IO Vector 0 is used for Netlink message header.
IO Vector 1 is used for iSCSI User Event (ev).
- The ev will be sent down with event type =
ISCSI_UEVENT_SET_NET_CONFIG
IO Vector 2 onwards, each vector consists of the struct
iscsi_net_param
with parameter name followed by its value.
The total size will be addition of all the IO vector sizes.
3.2 Kernel space code:
- Once event is received, the buffer will look like struct
iscsi_net_param
with parameter name followed by its value, then next parameter
and
its value and so on.
- the scsi_transport_iscsi would call the adapter's
transport->set_net_config - In set_net_config each
individual param can be decoded and set into the
hardware.
4. qla4xxx configuration:
iscsid, creates the iface for qla4xxx, based on the hwaddress.
To display
the iface related to qla4xxx execute following
\# iscsiadm -m iface
qla4xxx.00:0e:1e:04:8b:2e
qla4xxx,00:0e:1e:04:8b:2e,<empty>,<empty>,<empty>
qla4xxx.00:0e:1e:04:8b:2e.ipv6
qla4xxx,00:0e:1e:04:8b:2e,<empty>,<empty>,<e
mpty>
qla4xxx.00:0e:1e:04:8b:2a
qla4xxx,00:0e:1e:04:8b:2a,20.15.0.66,<empty>,<emp
ty>
qla4xxx.00:0e:1e:04:8b:2a.ipv6
qla4xxx,00:0e:1e:04:8b:2a,2001:DB8:1111:2222::8888,<empty>,<empty>
qla4xxx.00:0e:1e:04:8b:2a.ipv6.1
qla4xxx,00:0e:1e:04:8b:2a,2001:DB8:4444:5555::9999,<empty>,<empty>
To setup network configuration there can be two methods
4. 1. User can manually modify the iface file, and issue an "apply"
command.
---------------------------------------------------------------------------
\#cat /etc/iscsi/ifaces/
iface.example iface0 qla4xxx.00:0e:1e:04:8b:2a
qla4xxx.00:0e:1e:04:8b:2e
Example:
\# cat qla4xxx.00:0e:1e:04:8b:2a
iface.iscsi_ifacename = qla4xxx.00:0e:1e:04:8b:2a
iface.transport_name = qla4xxx
iface.hwaddress = 00:0e:1e:04:8b:2a
iface.state = enable
iface.iface_num = 0 (default)
iface.bootproto = static
iface.ipaddress = 192.168.2.2 (decimal)
iface.subnetmask = 255.255.255.0 (decimal)
\# vi qla4xxx.00:0e:1e:04:8b:2a.ipv6
(If file does not exist, the one can create it)
iface.iscsi_ifacename = qla4xxx.00:0e:1e:04:8b:2a.ipv6
iface.transport_name = qla4xxx
iface.hwaddress = 00:0e:1e:04:8b:2a
iface.ipaddress = 1111:2222::7777:8888 (hex)
iface.iface_num = 0
\# iscsiadm -m iface -H 00:0e:1e:04:8b:2a --op=applyall
This will find the ifaces on the host with MAC address
00:0e:1e:04:8b:2a and apply the settings to the hardware..
Note, this will read all the iface belonging to the same MAC
address.
Note2, Instead of a MAC address the host number can be
passed in.
4.2. User can use iscsiadm to specify the values and then apply
--------------------------------------------------------------
\# ls /etc/iscsi/ifaces/
iface.example iface0 qla4xxx.00:0e:1e:04:8b:2a
qla4xxx.00:0e:1e:04:8b:2e
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.ipaddress -v 192.168.1.2
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.gateway -v 192.168.1.1
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.subnet_mask -v 255.255.255.0
\# iscsiadm -m iface -H 00:0e:1e:04:8b:2a -o applyall
Setting up multiple IP:
First interface (default, no need to set iface_num, it is 0
by default)
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.ipaddress -v 192.168.1.2
Create the second one if it does not exist
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a.1 -op=new
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.iface_num -v 1 (Mandatory)
\# iscsiadm -m iface -I qla4xxx.00:0e:1e:04:8b:2a -o update
\
-n iface.ipaddress -v 192.168.1.3
\# iscsiadm -m iface -H 00:0e:1e:04:8b:2a --op=applyall
Note: If there are common settings for multiple interfaces
then the
settings from 0th iface would be considered valid.
Note: To apply settings for a single iface, just say
--op=apply
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Harish Zunjarrao <harish.zunjarrao@qlogic.com>
[formatting fixes and addition of host param for applyall]
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
|
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If you wanted to be able to create multiple session to the same
target portal, then you can now do
iscsiadm -m iface -I iface0 -o new
If you want to, set a binding:
iscsiadm -m iface -I iface0 ....set your binding
repeat iface creation
iscsiadm -m discovery -t st -p ip:port -I iface0 -I iface1 -I ....
or you can create and bind statically
iscsiadm -m node -T my_target -i ip:port,tpgt -I iface0 -I iface1 -I ....
then login like normal. Or you can login/logout of specific ifaces
like with the normal binding.
There is one known bug where discovery is not printing the
portals and binding setup nicely.
|
