VSC7440 datasheet(285/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

268

GCPU forwarding is controlled per individual CPU queue. Stack ports have additional options for GCPU

forwarded frames.

The IFH.MISC.CPU_MASK field is used to select the GCPU forwarding configuration. If multiple bits are

set in this mask, the most significant bit is always used to control the GCPU forwarding. The

ANA_AC::CPU_CFG.ONE_CPU_COPY_ONLY_MASK register is used to control how the CPU_MASK

is set before the frame enters the rewriter. If the CPU_MASK field is 0, all GCPU forwarding is disabled.

GCPU frame forwarding must be enabled in the OQS per CPU queue using the

QFWD::FRAME_COPY_CFG.FRMC_PORT_VAL registers.

Table 187 •

GCPU Configuration Registers

Description

Replication

GCPU_CFG.

GCPU_KEEP_IFH

Used when GCPU frames are forwarded to a front port.

Frames are sent with the IFH preserved. The IFH is encapsulated according

to the configuration. Setting GCPU_KEEP_IFH to a value different from 0

overrides the GCPU_TAG_SEL and GCPU_DO_NOT_REW settings for

front ports. No other rewrites are done to the frame.

The GCPU_KEEP_IFH setting is not active if PORT_CTRL.KEEP_IFH_SEL

is different from 0 or if PORT_CTRL.VSTAX_HDR_ENA = 1.

Per CPU Q

GCPU_CFG.

GCPU_DO_NOT_REW

Used when GCPU frames are forwarded to a front port.

Except for the optional tags configured in GCPU_CFG.GCPU_TAG_SEL,

frames are not modified when forwarded to the GCPU.

Per CPU Q

GCPU_CFG.

GCPU_TAG_SEL

The destination port type determines the functionality.

When a GCPU frame is forwarded to a stack port: Force a change of the

VSTAX.TAG to the configured values in GCPU_TAG_CFG:0.

When a GCPU frame is forwarded to a front port:

Optionally add one or two Q-tags to the frame. The tags are configured using

GCPU_TAG_CFG.

Per CPU Q

GCPU_CFG.

GCPU_FWD_MODE

Used when GCPU frames are forwarded to a stack port. Controls the value

of VSTAX.DST.DST_PN.

Per CPU Q

CPU_CFG.

GCPU_UPSPN

Used when GCPU frames are forwarded to a stack port.

CPU QUEUE to be used as destination queue for global CPU transmission.

The value depends on configuration and the value of

GCPU_CFG.GCPU_FWD_MODE. Controls the value of

VSTAX.DST.DST_PN.

Per CPU Q

GCPU_CFG.

GCPU_UPSID

Used when GCPU frames are forwarded to a stack port.

UPSID to be used as destination in the VStaX header. Sets

VSTAX.DST.DST_UPSID to configured value.

Per CPU Q

GCPU_TAG_CFG.

TAG_TPID_SEL

Configuration of Q-Tags for GCPU frames.

GCPU frames that are forwarded to a front port can optionally have one or

two IEEE 802.3 VLAN tags added. The tags will be placed in the outer most

position after the SMAC.

GCPU VLAN tag Protocol Identifiers (TPID).

GCPU_TAG_CFG.

TAG_VID_VAL

GCPU VLAN VID value.

GCPU_TAG_CFG.

TAG_DEI_VAL

GCPU VLAN DEI values.

GCPU_TAG_CFG.

TAG_PCP_SEL

Selection of GCPU VLAN PCP values.

GCPU_TAG_CFG.

TAG_PCP_VAL

GCPU VLAN PCP values.

VSC7440 Datasheet(PDF) 285 Page - Microsemi Corporation

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