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Yocto layer for LSI SAS2 and SAS3 SCSI Target Mode

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SCSI Target Mode for LSISAS2 and LSISAS3 Host Bus Adapters
==========================================================

This set of files provides support for adding SCSI Target Mode (STM) support to
Yocto (https://www.yoctoproject.org/) based targets using the SCST 
(http://scst.sourceforge.net/) framework.

If you want to use the SCST and Linux kernel patches outside of Yocto, look at
the following two patch files:

recipes-kernel/linux/linux-stable/linux-stable-4.1-mpt3sas_stm.patch

recipes-protocols/scst/files/0001-add-mpt3.patch

Requirements
------------

### Supported HBAs
SAS2.x (6Gbps)
* 9200-8e
* 9200-4i4e
* Any device based on the LSISAS2008 chipset with LSI IT firmware

SAS3.x (12Gbps)
* 9300-8e
* 9300-4i4e
* Any device based on the LSISAS3008 chipset with LSI IT firmware

### Supported versions of Yocto
This layer is known to work with Yocto version 1.7 and 1.8, and is maintained
against the poky 'master' branch.

### Supported Linux kernels
This layer is known to work with linux-stable 4.1.3, and may work with any
relatively recent Linux branch depending on the status of the LSI mpt3sas 
driver code.

### Supported version of SCST
This layer patch is known to work against SCST 3.0

Configuration
-------------

### HBA Configuration
In addition to having a compatible HBA, you must configure the HBA to enable
Target SCSI operations. To do this, you must use the 'lsiutil' command line
tool which is included with the packagegroup-stm-core package defined in this
layer. See Appendix 1 below for specifics on using the lsiutil command.

### Yocto Configuration
In order for Yocto to use this layer, you must add it to your layers.conf
file.

Appendix 1: Configuring HBAs with lsituil
=========================================
The lsiutil utility allows you to edit NVDATA paramaters on the HBA to 
activate hardware and firmware Target I/O capabilities. In order to operate
correctly, each PHY to be connected to a remote host must be part of a distinct
port, and only a single port is supported in the current patch set.

### Example 
Here is an example of how one HBA has been configured with a single x4 port for
normal Initator traffic, and a second x4 port for Target traffic:

root@demox86-64:~# lsiutil

LSI Logic MPT Configuration Utility, Version 1.72, Sep 09, 2014
    modprobe: module mptctl not found in modules.dep

1 MPT Port found

Port Name         Chip Vendor/Type/Rev    MPT Rev  Firmware Rev  IOC
    1.  ioc0              LSI Logic SAS3008 C0      205      01000200     0

Select a device:  [1-1 or 0 to quit] 1

1.  Identify firmware, BIOS, and/or FCode
    2.  Download firmware (update the FLASH)
    4.  Download/erase BIOS and/or FCode (update the FLASH)
    8.  Scan for devices
    801.  Scan for 1 LUN
    810.  Scan for 10 LUN's
    10.  Change IOC settings (interrupt coalescing)
    13.  Change SAS IO Unit settings
    16.  Display attached devices
    20.  Diagnostics
    21.  RAID actions
    23.  Reset target
    42.  Display operating system names for devices
    43.  Diagnostic Buffer actions
    45.  Concatenate SAS firmware and NVDATA files
    59.  Dump PCI config space
    60.  Show non-default settings
    61.  Restore default settings
    66.  Show SAS discovery errors
    69.  Show board manufacturing information
    97.  Reset SAS link, HARD RESET
    98.  Reset SAS link
    99.  Reset port
    e   Enable expert mode in menus
    p   Enable paged mode
    w   Enable logging

Main menu, select an option:  [1-99 or e/p/w or 0 to quit] 13

SATA Maximum Queue Depth:  [0 to 255, default is 128]
    SAS Max Queue Depth, Narrow:  [0 to 65535, default is 256]
    SAS Max Queue Depth, Wide:  [0 to 65535, default is 256]
    Device Missing Report Delay:  [0 to 2047, default is 0]
    Device Missing I/O Delay:  [0 to 255, default is 0]

PhyNum  Link      MinRate  MaxRate  Initiator  Target    Port
    0    Enabled     3.0      12.0    Disabled   Enabled     1
    1    Enabled     3.0      12.0    Disabled   Enabled     1
    2    Enabled     3.0      12.0    Disabled   Enabled     1
    3    Enabled     3.0      12.0    Disabled   Enabled     1
    4    Enabled     3.0      12.0    Enabled    Disabled  Auto
    5    Enabled     3.0      12.0    Enabled    Disabled  Auto
    6    Enabled     3.0      12.0    Enabled    Disabled  Auto
    7    Enabled     3.0      12.0    Enabled    Disabled  Auto

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