AR8327-AL1A-R datasheet(24/394 Pages) ETC2

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24 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

24 • June 2011

COMPANY CONFIDENTIAL

2.2 Atheros Header

AR8327 support proprietary Atheros Header that can indicate the packet information and allow CPU

to control the packet forwarding. The Header can be 2 bytes or 4 bytes with additional 2 bytes

identifier. For 2 bytes header case, each packet sent out or received must include header. For 4 bytes

header case, Header can exist only in the management frame and there is no header in the normal

frame. The Atheros header also supports read/write register through the CPU port.

Table 2-1 shows the Type in the Atheros Header.

Table 2-1.

Atheros Header Type

Type

Packet Type

Description

5'h0

NORMAL

NORMAL PACKET

5'h1

MIB

The packet includes MIB counter for the source port number in the

header.

5'h2

Read_write_reg_ack

This packet indicates the register data for read register command or

acknowledge for write register command. See read/write register in

the chapter of Atheros Header receive.

5'h3

802.1x

5'h4

Reserved MAC ADDR.

Reserved ARL

5'h5

RIPv1

5'h6

DHCP

5'h7

PPPoe Discovery

PPPoE discovery

5'h8

ARP

ARP(IF ARP not found, change this type to 5'h13)

5'h9

Reserved

Reserved for RARP

5'hA

IGMP

IGMP packets

5'hB

MLD

MLD packets

5'hC

Reserved

Reserved for neighbor discovery

5'hD

Redirect to CPU

Acl_redirect_to_CPU, ARL_redirect_to_CPU offload match redirect to

cpu

5'hE

normalization

The frame doesn't compliance with normal TCP/IP flow.

5'hF

LEARN LIMIT

The MAC address already reach the learning limit.

5'h10

IPv4 NAT TO CPU

1.doing NAT and TCP special status

2.doing NAT and frame is IP fragment

5'h11

IP frame: SIP not found

The SIP in IP frame doesn't pass the source check.

5'h12

NAT NOT FOUND

5'h13

ARP not found

The ARP frame doesn't pass the source check.

5'h14

IP frame: routing not

found

The frame DIP is not found in the routing table.

5'h15

TTL Exceed

The router try to forward one frame, but the TTL is 0 after decrease 1

and the destination is not CPU.

5'h16

MTU Exceed

The frame length exceed the MTU.

5'h17

Copy to CPU

acl_copy_to_CPU, arl_copy_to_CPU,

offload match copy to cpu

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