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IXP400 Software
Access-Layer Components: Ethernet Access (IxEthAcc) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
150 Document Number: 252539, Revision: 007
ixp_ne_flags.new_src
New source address flag. A value of 0 indicates that a matching
entry for the frame's source MAC address exists in the filtering
database; a value of 1 indicates that no matching entry could be
found. For NPE Ethernet firmware versions not supporting an NPE
Learning/Filtering Tree, this field is always set to 0.
W
(6)
ixp_ne_flags.filter
Deferred filter flag. A value of 0 indicates a normal frame. A value of
1 indicates that the NPE would normally have dropped the frame
due to a filtering operation, but that the frame was preserved and
presented to the Intel XScale core client because it contains a new
source MAC address that must be learned. Furthermore, when this
flag is set, the only IX_OSAL_MBUF fields that may be considered
to be valid are ixp_ne_next, ixp_ne_data, ixp_ne_dest_mac, and
ixp_ne_src_mac. For NPE firmware versions that do not support
source MAC address learning, this flag is always set to 0.
NOTE: IxEthAcc will not forward these frames to the client
application. After IxEthDB is notified of the new MAC
address, the buffer will be replenished to the EthRxFree
queue.
W
(6)
ixp_ne_flags.st_proto
Spanning tree protocol flag. A value of 0 indicates a normal frame;
a value of 1 indicates a spanning tree protocol BPDU.
W
(6)
R
ixp_ne_flags.link_prot
Link layer protocol indicator. This field reflects the state of a frame
as it exits an NPE on the receive path (and is placed into an EthRx
queue) or enters an NPE on the transmit path (from the EthTx
queue). It does not reflect the state of the frame when it is received
or transmitted through an MII port. Its values are as listed in
Table 22.
W
(6)
R
ixp_ne_flags.ip_prot
IP flag. A value of 0 indicates a non-IP payload; a value of 1
indicates an IP payload.
W
(6)
ixp_ne_flags.multicast
Multicast flag. A value of 0 indicates a non-multicast frame; a value
of 1 indicates a multicast frame.
W
(6)
ixp_ne_flags.broadcast
Broadcast flag. A value of 0 indicates a non-broadcast frame; a
value of 1 indicates a broadcast frame.
W
(6)
ixp_ne_flags.port_over
Destination port override flag. A value of 0 indicates that the
destination MAC address should be used by the NPE to determine
the egress port for the frame; a value of 1 indicates that the value
of the ixp_ne_dest_port field should be used to determine the
egress port. This flag is meaningful only for multiported NPEs, such
as Ethernet NPE B on Intel
®
IXP46X product line processors.
Single port NPEs, such as those on IXP42X product line
processors, will ignore this flag.
W
(5,6)
R
(1)
ixp_ne_flags.tag_over
Transmit VLAN tagging override flag. A value 0 indicates that the
default tagging behavior for the port/VID should be followed; a
value of 1 indicates that the default behavior should be overridden
by the ixp_ne_flags.tag_mode flag.
W
(5,6)
R
ixp_ne_flags.tag_mode
VLAN tag behavior flag (ignored if the value of
ixp_ne_flags.tag_over is 0). A value of 0 indicates that the output
transmitted frame should be untagged; a value of 1 indicates that
the output transmitted frame should be tagged.
W
(5,6)
R
(2)
Table 19. IX_OSAL_MBUF Header Definitions for the Ethernet Subsystem (Sheet 2 of 3)
Field Description
Queue
Eth
Rx
Free
Eth
Rx
Eth
Tx
Eth
Tx
Done