SRIOV Config Tab - 1.3 English

The SRIOV Configuration Advanced parameters, as shown in the following figure, are described in this section.

General SRIOV Config

This value specifies the offset of the first PF with at least one enabled VF. When ARI is enabled, allowed value is 'd4 or 'd64, and the total number of VF in all PFs plus this field must not be greater than 256. When ARI is disabled, this field will be set to 1 to support 1PF plus 7VF non-ARI SR-IOV configurations only.

Cap Version

Indicates the 4-bit SR-IOV Capability version for the physical function.

Number of PFx VFs

Indicates the number of virtual functions associated to the physical function. A total of 252 virtual functions are available that can be flexibly used across the four physical functions. Number of VFs for any enabled PF cannot be 0.

PFx Dependency Link

Indicates the SR-IOV Functional Dependency Link for the physical function. The programming model for a device can have vendor-specific dependencies between sets of functions. The Function Dependency Link field is used to describe these dependencies.

First VF Offset

Indicates the offset of the first virtual function (VF) for the physical function (PF). PFx offset is always fixed. PF0 resides at offset 0, PF1 resides at offset 1, PF2 resides at offset 2, and PF3 resides at offset 3.

A total of 252 virtual functions are available. They reside at the function number range 4 to 255.

You can select either 4 or 64 for the first VF offset in the customization GUI, if the last VF offset is not more than 255.

Examples

• When the total number of enabled VFs is less than 192, select either 4 or 64 for the first VF offset. The last VF offset will be less than 255.
• When the total number of enabled VFs is more than 192, select 4 for first VF offset. In this case, 64 is not permitted for first VF offset, because the last VF offset will become more the 255.

Virtual functions are mapped sequentially with VFs with PFs taking precedence. For example, if PF0 has two virtual functions and PF1 has three, the following mapping occurs:

The PFx_FIRST_VF_OFFSET is calculated by taking the first offset of the virtual function and subtracting that from the offset of the physical function.

PFx_FIRST_VF_OFFSET = (PFx first VF offset - PFx offset)

In the example above, the following offsets are used:

PF0_FIRST_VF_OFFSET = (4 - 0) = 4
PF1_FIRST_VF_OFFSET = (6 - 1) = 5

The initial offset for PF1 is a function of how many VFs are attached to PF0 and is defined in the following pseudo code:

PF1_FIRST_VF_OFFSET = FIRST_VF_OFFSET + NUM_PF0_VFs - 1

Similarly, for other PFs:

PF2_FIRST_VF_OFFSET = FIRST_VF_OFFSET + NUM_PF0_VFs + NUM_PF1_VFs - 2 PF3_FIRST_VF_OFFSET =
        FIRST_VF_OFFSET + NUM_PF0_VFs + NUM_PF1_VFs + NUM_PF2_VFs - 3

VF Device ID

Indicates the 16-bit Device ID for all virtual functions associated with the physical function.

SRIOV Supported Page Size

Indicates the page size supported by the physical function. This physical function supports a page size of 2⁽ⁿ⁺¹²⁾, if bit n of the 32-bit register is set.