VSC7440 datasheet(136/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

119

case SKIP_IP_ETH:

switch (frame_type_current) {

case ETH:

// Move frame_ptr past DMAC, SMAC, 0-3 VLAN tags and EtherType

if (EtherType(frame_ptr) == ETYPE_IP4) || // 0x0800

(EtherType(frame_ptr) == ETYPE_IP6) {

// 0x86DD

SkipLinkLayer(&frame_ptr);

// Move frame_ptr past IPv4 header (including options) or

// IPv6 header

SkipIPHeader(&frame_ptr);

}

break;

case CW:

switch (IPVersion(frame_ptr)) {

case 4:

case 6:

// Move frame_ptr past IPv4 header (including options) or

// IPv6 header

SkipIPHeader(&frame_ptr);

break;

}

break;

}

frame_type = clm_action.nxt_type_after_offset;

} // clm_action.nxt_offset_from_type > 0

if (clm_action.nxt_norm_w16_offset > 0) {

// Move frame_ptr a specific number of bytes

frame_ptr

= frame_ptr + 2*clm_action.nxt_norm_w16_offset;

frame_type = clm_action.nxt_type_after_offset;

}

if (frame_type_current == DATA &&

clm_action.nxt_key_type != 0) {

// Allow frame_type change, regardsless of whether frame_ptr

// has been moved

frame_type = clm_action.nxt_type_after_offset;

}

// PW termination of MPLS frame

if (clm_action.fwd_type == TERMINATE_PW) {

if IsOam(frame_ptr, csr) && (clm_key_fields_mpls.rsv_lbl_pos) {

// Reserved label used to identify OAM

// Move frame_ptr if reserved MPLS label was skipped by

// ClmKeyFieldsMpls() in key generation prior to VCAP CLM lookup

frame_ptr += 4;

} elsif (frame_type == CW && !IsOam(frame_ptr, csr)) {

// PW termination of MPLS frame with CW => Skip CW and

// change frame_type

frame_ptr += 4;

frame_type = ETH;

}

// OAM LSP

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