VSC7440 datasheet(134/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

117

return clm_action.nxt_key_type;

}

// Determine key type based on port parameters and frame_ptr/frame_type

switch (frame_type) {

case ETH:

// Choose key type based on EtherType

// The EtherType() function skips any VLAN tags. A maximum of 3 VLAN

// tags can be skipped.

switch (EtherType(frame_ptr)) {

case ETYPE_IP4: // 0x0800

key_type = port_clm_cfg.ip4_clm_key_sel;

break;

case ETYPE_IP6: // 0x86DD

key_type = port_clm_cfg.ip6_clm_key_sel;

break;

case ETYPE_MPLS_UC: // 0x8847

key_type = port_clm_cfg.mpls_uc_clm_key_sel;

break;

case ETYPE_MPLS_MC: // 0x8848

key_type = port_clm_cfg.mpls_mc_clm_key_sel;

break;

}

if (key_type = 0) {

key_type = port_clm_cfg.etype_clm_key_sel;

}

break;

case CW:

switch (IPVersion(frame_ptr)) {

case 4 : key_type = port_clm_cfg.ip4_clm_key_sel;

break;

case 6 : key_type = port_clm_cfg.ip6_clm_key_sel;

break;

default: key_type = port_clm_cfg.etype_clm_key_sel; break;

}

break;

case MPLS:

key_type = port_clm_cfg.mlbs_clm_key_sel;

break;

}

return key_type;

} // ClmKeyType

// ---------------------------------------------------------------------

// ANA_CL: VCAP CLM Key Type Selection

// ======================================================================

By default, frames looped by the rewriter or frames already discarded or CPU-redirected, for instance the

basic classifier, are not subject to VCAP CLM lookups. Optionally, VCAP CLM lookups can be enforced

through configuration ANA_CL::CLM_MISC_CTRL.LBK_CLM_FORCE_ENA for looped frames and

through ANA_CL::CLM_MISC_CTRL.IGR_PORT_CLM_FORCE_ENA for frames already discarded or

CPU-redirected. When forcing a VCAP CLM lookup, the VCAP CLM key is chosen from the configuration

in ANA_CL::CLM_MISC_CTRL.FORCED_KEY_SEL. Only selected keys are available.

3.16.2.2 Frame Pointer and Frame Type Update

After each VCAP CLM lookup, the information in the associated action is used to update frame_ptr and

frame_type. This in turn influences the key type and key field values used for the next VCAP CLM

lookup.

VSC7440 датащи(PDF) 134 Page - Microsemi Corporation

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