VSC7511 datasheet(134/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

119

3.10.1

Policer Allocation

The different policer types are assigned a policer from the pool of policers the following ways:

•

Port policers. Frames received on physical port ‘p’ use policer ‘p’. Each of physical ports can be

assigned to its own policer.

•

QoS policers. Frames classified to QoS class ‘q’ on physical port ‘p’ use policer 32 + 8x ‘p’ + ‘q’.

Each of the eight per-port QoS classes per port can be assigned to its own policer.

•

VCAP IS2 policers. Policers 128 through 191 can be allocated to VCAP policing. The action

IS2_ACTION.POLICE_IDX points to the policer that is used.

The policer pool layout is illustrated in the following drawing.

Figure 35 •

Policer Pool Layout

By default, none of the policers from the pool are allocated.

Port policers are allocated through ANA:PORT:POL_CFG.PORT_POL_ENA per port and QoS policers

are allocated through ANA:PORT:POL_CFG.QUEUE_POL_ENA per QoS class per port.

Finally, VCAP IS2 policers are allocated by creating IS2 rules with POLICE_ENA and POLICE_IDX

actions. IS2 policers actions are only valid in the first lookup in IS2. The VCAP can point to any unused

policer in addition to the dedicated VCAP policers.

Any frame received by the MAC and forwarded to the classifier is applicable to policing. Frames with

errors, pause frames, or MAC control frames are not forwarded by the MAC and, as a result, they are not

accounted for in the policers. That is, they are not policed and are not adding to the rate measured by the

policers.

In addition, the following special frame types can bypass the policers:

ANA:POL:POL_PIR_CFG

Configures the policer’s peak information rate

384

ANA:POL:POL_CIR_CFG

Configures the policer’s committed information rate

384

ANA:POL:POL_MODE_CFG

Configures the policer’s mode of operation

384

ANA:POL:POL_PIR_STATE

Current state of the peak information rate bucket

384

ANA:POL:POL_CIR_STATE

Current state of the committed information rate bucket

384

ANA:PORT:POL_FLOWC

Flow control settings

Per port

ANA::POL_HYST

Hysteresis settings

None

Table 95 •

Policer Control Registers (continued)

Description

Replication

127

128

191

Port Policers (12)

QoS Policers (96)

Unused

VCAP Policers (64)

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