VSC7440 datasheet(145/444 Pages) MICROSEMI

145 / 444 page

Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

128

// Not received from stack port, so determine port type and

// update req accordingly.

// 0b00: Promiscuous port

// 0b01: Community port

// 0b10: Isolated port

req.ingr_port_type = 0b00;

if (csr.vlan_community_mask[req.port_num]) {

req.ingr_port_type = 0b01;

}

if (csr.vlan_isolated_mask[req.port_num]) {

req.ingr_port_type = 0b10;

}

if (req.ingr_port_type == 0b10) {

// Isolated port

// Only allow communication with promiscuous ports

igr_vlan_entry.vlan_port_mask &=

(~csr.vlan_isolated_mask & ~csr.vlan_community_mask);

} else if (req.ingr_port_type == 0b01) {

// Community port

// Allow communication with promiscuous ports and other community

ports,

// but not with isolated ports

igr_vlan_entry.vlan_port_mask &= ~csr.vlan_isolated_mask;

}

} // vlan_igr_filter_ena

} // csr.vlan_ena

}

// Only allow forwarding to enabled ports

igr_vlan_entry.vlan_port_mask &= csr.port_fwd_ena;

// Update req with results

req.vlan_mask = igr_vlan_entry.vlan_port_mask & igr_mstp_entry.mstp_fwd_mask;

req.ifid

= igr_vlan_entry.vlan_fid;

req.vlan_mirror

= igr_vlan_entry.vlan_mirror_ena;

req.vlan_flood_dis

= igr_vlan_entry.vlan_flood_dis;

req.vlan_sec_fwd_ena = igr_vlan_entry.vlan_sec_fwd_ena;

// Identical ingress and egress FID/VID.

// May be overruled later by egress VLAN handling.

// Note: ANA_L2 DMAC lookup always use req.efid, even when req.l3_fwd=0.

req.evid = req.ivid;

if (req.dmac[40]) {

// If MC, DA lookup must use EVID

req.efid = req.vsi_ena . req.evid;

} else {

// If UC, DA lookup must use IFID

req.efid = req.ifid;

}

// Store vmid for later use (e.g. in rleg detection)

req.irleg = igr_vlan_entry.vmid;

req.erleg = req.irleg;

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