VSC7440 datasheet(212/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

195

3.23.2.4 Priority Policing

The configuration parameters for priority policing are listed in the following table.

Non-service frames (which ISDX = 0 and ANA_L2:ISDX:DLB_CFG.DLB_IDX = 0) can use the service

policers as priority policers. This is enabled in ANA_L2::FWD_CFG.QUEUE_DEFAULT_SDLB_ENA.

The frame’s ingress port and classified QoS class select the priority policer. The configuration of the

priority policer follows the configuration of the service policers. For more information, see All policers can

be configured to add between –64 and 63 bytes per frame to adjust the counted frame size for inter-

frame gap and/or encapsulation., page 192.

Note that a DLB policer index enabled by VCAP IS2 action ACL_MAC[16] takes precedence over the

priority policing. In that case, the frame is policed by the VCAP selected policer and not the priority

policer.

3.23.2.5 Port Policing

Each port policer entry contains the fields listed in the following table.

Frames applicable for policing are any frames received by the MAC and forwarded to the classifier. Short

frames (less than 148 bytes) with errors, pause frames, or MAC control frames are not forwarded by the

MAC and therefore not accounted for in the policers, That is, they are not policed and do not add to the

rate measured by the policers.

Port policers are enabled by configuring the traffic type to be policed

(ANA_AC_POL:POL_PORT_CTRL:POL_PORT_CFG.TRAFFIC_TYPE_MASK) and specifying a

corresponding rate (ANA_AC_POL:POL_PORT_CFG:POL_PORT_RATE_CFG.PORT_RATE).

Table 124 •

Priority Policer Table Entry

Field

Description

ANA_L2::FWD.QUEUE_DEFAULT_SDLB_ENA

Enables priority policers for non-service frames.

ANA_L2:PORT:PORT_DLB_CFG.QUEUE_DLB_IDX

Specifies which DLB policers are used for priority policing.

Table 125 •

Port Policer Table Entry

Field

Bits Description

TRAFFIC_TYPE_MASK

Configures the traffic types to be taken into account by the policer.

FRAME_RATE_ENA

Configures frame rate mode for the port policer, where rates are measured

in frames per second instead of bytes per second.

LIMIT_NONCPU_TRAFFIC_ENA

Configures how policing affects traffic towards front ports.

LIMIT_CPU_TRAFFIC_ENA

Configures how policing affects traffic towards CPU.

CPU_QU_MASK

Configures policing of frames to the individual CPU queues for the port

policer (see TRAFFIC_TYPE_MASK).

FC_ENA

Configures port policer to trigger flow control.

FC_STATE

Current flow control state.

DP_BYPASS_LVL

Controls the lowest DP level that is taken into account. That is, traffic with

DP below this value is ignored and not policed.

GAP_VALUE

Configures the leaky bucket calculation to include or exclude preamble,

inter-frame gap and optional encapsulation through configuration.

PORT_THRES0

Configures port policer burst capacity.

PORT_THRES1

Configures port policer hysteresis size when a port policer is in flow control

mode (see FC_ENA).

PORT_RATE

Configures port policer rate.

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