Linux fiber channel driver

Linux Fibre Channel SCSI Target using SCST

Fibre channel or Fiber Channel is also another way to present SCSI devices over a network medium using a complete different protocol suite then my previous article on iSCSI. With Fiber Channel transfer speeds and protocol delivery is much faster than iSCSI. The fundamental difference between the two is iSCSI uses TCP/IP protocol suite to deliver SCSI messages, and Fiber Channel uses Fiber channel to deliver SCSI message. This means that you will have to have network equipment that is Fiber Channel capable, such as Fiber Channel switches, Fiber Channel HBA (similar to TCP/IP NICs), etc. For the purposes of this article I will not go into how Fiber Channel works, or how it does it’s job of delivering SCSI messages two and from SCSI initiators and SCSI targets. This article will step through how to turn a Linux machine into a Fiber channel SCSI Target. There are a few things you will need to even attempt this:

• A Linux machine running Kernel 3.2+
• SCST and SCSTAdmin (see below steps)
• A separate machine that will act as a Fiber channel initiator, this can be another Linux machine, or an ESX host, etc
• At least two(2) Fiber channel HBA’s with one physical WWN port each installed in both machines
• A OM2 or 3 Multi-mode Fiber cable with connectors capable of being used with the HBAs
• Enough disk space to create a Virtual Disk so we may present it as a LUN
• And lastly, some excitement!! you are about to enter the new world of Fiber Channel!!

Preparing the builds

Identify card Qlogic card

dmesg | grep Fibre dmesg | Fiber

Download firmware and copy to firmware directory

wget http://ldriver.qlogic.com/firmware/ql2400_fw.bin cp ql2400_fw.bin /lib/firmware/

# preferred wget http://ftp.us.debian.org/debian/pool/non-free/f/firmware-nonfree/firmware-qlogic_0.36+wheezy.1_all.deb dpkg -i firmware-qlogicf_0.36+wheezy.1_all.deb

Remove the current qla2xxx module

rmmod qla2xxx echo blacklist qla2xxx >/etc/modprobe.d/blacklist-qla2xxx.conf update-initramfs -u reboot

Download dependencies to build scst and Patch the kernel

apt-get install fakeroot kernel-wedge build-essential makedumpfile kernel-package libncurses5 libncurses5-dev gcc libncurses5-dev linux-headers-$(uname -r) lsscsi patch subversion

Get Kernel and SCST Source:

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Linux fiber channel driver

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How to check Fibre Channel HBAs in Linux

Fibre Channel (FC) Host Bus Adapters (HBA) are interface cards that connects the host system to a fibre channel network or devices. The two major manufacturers of FC HBAs are QLogic and Emulex and the drivers for many HBAs are distributed in-box with the Operating Systems. If the drivers are not available on your Linux version, you need to install them manually and load the modules in kernel

Here is a step by step guide to verify that your FC HBAs installed and configured correctly.

Step-1: Determine the Manufacturer and Model of the HBAs.

# lspci | grep "Fibre Channel" 07:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02) 0a:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02) 

The above output shows the system bus has detected two QLogic HBAs.

Step-2: Get the Vendor and Device IDs for the HBAs installed.

# vi /usr/share/hwdata/pci.ids . 1077 QLogic Corp. 2532 ISP2532-based 8Gb Fibre Channel to PCI Express HBA . 

The vendor id for QLogic is 1077 and the device id is 2532. You could confirm this using the lspci -nn command as shown below

# lspci -nn | grep "Fibre Channel" 07:00.0 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02) 0a:00.0 Fibre Channel [0c04]: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA [1077:2532] (rev 02) 

Step-3: Check if the driver modules are installed.

This can be done by searching the list of available modules. (Replace 2.6.18-308.el5PAE with your kernel version in the command below)

# grep 1077 /lib/modules/2.6.18-308.el5PAE/modules.* | grep 2532 /lib/modules/2.6.18-308.el5PAE/modules.alias:alias pci:v00001077d00002532sv*sd*bc*sc*i* qla2xxx /lib/modules/2.6.18-308.el5PAE/modules.pcimap:qla2xxx 0x00001077 0x00002532 0xffffffff 0xffffffff 0x00000000 0x00000000 0x0 

The above output shows that this HBA is supported by the module qla2xxx

Step-4: Check if the drivers for these HBAs are loaded in the kernel.

# lsmod | grep qla2xxx qla2xxx 1205905 0 scsi_transport_fc 44745 1 qla2xxx scsi_mod 144277 16 be2iscsi, ib_iser, iscsi_tcp, bnx2i, libcxgbi, libiscsi2, scsi_transport_iscsi2, scsi_dh, sr_mod, sg, usb_storage, qla2xxx, scsi_transport_fc, libata,cciss, sd_mod 

The output shows the module qla2xxx is loaded by the kernel. If you don’t see any output for lsmod command then you can load the module using modprobe command

Step-5: Getting detailed information

You can find detailed information about the fibre channel adapters in the location /sys/class/fc_host/

# ll /sys/class/fc_host/ drwxr-xr-x 3 root root 0 Feb 5 11:28 host3 drwxr-xr-x 3 root root 0 Feb 5 11:28 host4 

The directories host3 and host4 in the example above contains information specific to each adapter like node name (WWN), port name (WWN), type, speed,state etc.,

An easier way to get this information is to use the systool command.

# systool -c fc_host Class = "fc_host" Class Device = "host3" Device = "host3" Class Device = "host4" Device = "host4" 

# systool -c fc_host -v host3 Class = "fc_host" Class Device = "host3" Class Device path = "/sys/class/fc_host/host3" fabric_name = "0x50014380272531e9" issue_lip = node_name = "0x50014380281412e9" port_id = "0x0000e8" port_name = "0x50014380281412e8" port_state = "Online" port_type = "LPort (private loop)" speed = "8 Gbit" supported_classes = "Class 3" supported_speeds = "1 Gbit, 2 Gbit, 4 Gbit, 8 Gbit" symbolic_name = "HPAK344A FW:v5.06.03 DVR:v8.03.07.09.05.08-k" system_hostname = "" tgtid_bind_type = "wwpn (World Wide Port Name)" uevent = Device = "host3" Device path = "/sys/devices/pci0000:00/0000:00:01.0/0000:07:00.0/host3" edc = fw_dump = nvram = "ISP " optrom_ctl = optrom = reset = sfp = "" uevent = vpd = "&" 

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