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MPR(4) Device Drivers Manual MPR(4)

mpr — LSI Fusion-MPT 3/3.5 IT/IR 12Gb/s Serial Attached SCSI/SATA/PCIe driver

To compile this driver into the kernel, place these lines in the kernel configuration file:

device pci
device scbus
device mpr

The driver can be loaded as a module at boot time by placing this line in loader.conf(5):

mpr_load="YES"

The mpr driver provides support for Broadcom Ltd./Avago Tech (LSI) Fusion-MPT 3/3.5 IT/IR SAS/PCIe controllers.

These controllers are supported by the mpr driver:

In all tunable descriptions below, X represents the adapter number.

To disable MSI interrupts for all mpr driver instances, set this tunable value in loader.conf(5):

hw.mpr.msi_enable=0

To disable MSI interrupts for a specific mpr driver instance, set this tunable value in loader.conf(5):

dev.mpr.X.msi_enable=0

To set the maximum number of DMA chains allocated for all adapters, set this tunable in loader.conf(5):

hw.mpr.max_chains=NNNN

To set the maximum number of DMA chains allocated for a specific adapter, set this tunable in loader.conf(5):

dev.mpr.X.max_chains=NNNN

The default max_chains value is 2048.

The current number of free chain frames is stored in the dev.mpr.X.chain_free sysctl(8) variable.

The lowest number of free chain frames seen since boot is stored in the dev.mpr.X.chain_free_lowwater sysctl(8) variable.

The number of times that chain frame allocations have failed since boot is stored in the dev.mpr.X.chain_alloc_fail sysctl(8) variable. This can be used to determine whether the max_chains tunable should be increased to help performance.

The current number of active I/O commands is shown in the dev.mpr.X.io_cmds_active sysctl(8) variable.

The current number of free PRP pages is stored in the dev.mpr.X.prp_pages_free sysctl(8) variable. PRP pages are used by NVMe devices for I/O transfers, much like Scatter/Gather lists.

The lowest number of free PRP pages seen since boot is stored in the dev.mpr.X.prp_pages_free_lowwater sysctl(8) variable.

The number of times that PRP page allocations have failed since boot is stored in the dev.mpr.X.prp_page_alloc_fail sysctl(8) variable.

To set the maximum number of pages that will be used per I/O for all adapters, set this tunable in loader.conf(5):

hw.mpr.max_io_pages=NNNN

To set the maximum number of pages that will be used per I/O for a specific adapter, set this tunable in loader.conf(5):

dev.mpr.X.max_io_pages=NNNN

The default max_io_pages value is -1, meaning that the maximum I/O size that will be used per I/O will be calculated using the IOCFacts values stored in the controller. The lowest value that the driver will use for max_io_pages is 1, otherwise IOCFacts will be used to calculate the maximum I/O size. The smaller I/O size calculated from either max_io_pages or IOCFacts will be the maximum I/O size used by the driver.

The highest number of active I/O commands seen since boot is stored in the dev.mpr.X.io_cmds_highwater sysctl(8) variable.

Devices can be excluded from mpr control for all adapters by setting this tunable in loader.conf(5):

hw.mpr.exclude_ids=Y

Y represents the target ID of the device. If more than one device is to be excluded, target IDs are separated by commas.

Devices can be excluded from mpr control for a specific adapter by setting this tunable in loader.conf(5):

dev.mpr.X.exclude_ids=Y

Y represents the target ID of the device. If more than one device is to be excluded, target IDs are separated by commas.

The adapter can issue the SCSI command to SATA direct-access devices during shutdown. This allows the device to quiesce powering down. To control this feature for all adapters, set the

hw.mpr.enable_ssu

tunable in loader.conf(5) to one of these values:

0
Do not send SSU to either HDDs or SSDs.
1
Send SSU to SSDs, but not to HDDs. This is the default value.
2
Send SSU to HDDs, but not to SSDs.
3
Send SSU to both HDDs and SSDs.

To control this feature for a specific adapter, set this tunable value in loader.conf(5):

dev.mpr.X.enable_ssu

The same set of values are valid as when setting this tunable for all adapters.

SATA disks that take several seconds to spin up and fail the SATA Identify command might not be discovered by the driver. This problem can sometimes be overcome by increasing the value of the spinup wait time in loader.conf(5) with the

hw.mpr.spinup_wait_time=NNNN

tunable. NNNN represents the number of seconds to wait for SATA devices to spin up when the device fails the initial SATA Identify command.

Spinup wait times can be set for specific adapters in loader.conf(5): with the

dev.mpr.X.spinup_wait_time=NNNN

tunable. NNNN is the number of seconds to wait for SATA devices to spin up when they fail the initial SATA Identify command.

The driver can map devices discovered by the adapter so that target IDs corresponding to a specific device persist across resets and reboots. In some cases it is possible for devices to lose their mapped IDs due to unexpected behavior from certain hardware, such as some types of enclosures. To overcome this problem, a tunable is provided that will force the driver to map devices using the Phy number associated with the device. This feature is not recommended if the topology includes multiple enclosures/expanders. If multiple enclosures/expanders are present in the topology, Phy numbers are repeated, causing all devices at these Phy numbers except the first device to fail enumeration. To control this feature for all adapters, set the

hw.mpr.use_phy_num

tunable in loader.conf(5) to one of these values:

-1
Only use Phy numbers to map devices and bypass the driver's mapping logic.
0
Never use Phy numbers to map devices.
1
Use Phy numbers to map devices, but only if the driver's mapping logic fails to map the device that is being enumerated. This is the default value.

To control this feature for a specific adapter, set this tunable value in loader.conf(5):

dev.mpr.X.use_phy_num

The same set of values are valid as when setting this tunable for all adapters.

To enable debugging prints from the mpr driver, set the

hw.mpr.X.debug_level

tunable, either in loader.conf(5) or by using sysctl(8). These bits have the described effects:

0x0001 Enable informational prints (set by default).
0x0002 Enable prints for driver faults (set by default).
0x0004 Enable prints for controller events.
0x0008 Enable prints for controller logging.
0x0010 Enable prints for tracing recovery operations.
0x0020 Enable prints for parameter errors and programming bugs.
0x0040 Enable prints for system initialization operations.
0x0080 Enable prints for more detailed information.
0x0100 Enable prints for user-generated commands (IOCTL).
0x0200 Enable prints for device mapping.
0x0400 Enable prints for tracing through driver functions.

cam(4), cd(4), ch(4), da(4), mps(4), mpt(4), pci(4), sa(4), scsi(4), targ(4), loader.conf(5), sysctl(8)

The mpr driver first appeared in FreeBSD 9.3.

The mpr driver was originally written by Scott Long <scottl@FreeBSD.org>. It has been improved and tested by LSI Corporation, Avago Technologies (formally LSI), and Broadcom Ltd. (formally Avago).

This man page was written by Ken Merry <ken@FreeBSD.org> with additional input from Stephen McConnell <slm@FreeBSD.org>.

April 24, 2018 DragonFly-5.6.1