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IXP400 Software
Buffer Management
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007 39
Figure 6. OSAL IXP_BUF structure and macros
Depending upon the usage model, different software components use the structures to update the
internal fields of the IXP_BUF structure. Figure 7 shows a typical interface for the API users or
operating system drivers to the IXP_BUF fields. Depending upon the access-layer components in
use the API user may or may not use the service-specific macros to read the NPE-shared structure
of the IXP_BUF fields. Reading of the MAC address or a VLAN tag for a quick classification is an
example of NPE-shared structure use.
B-3827
OSAL macros for IXP400 IXP_BUFIXP_BUF fields
Cache Line
ix_next
ix_nextPacket
ix_data
ix_type ix_flags ix_reserved
ix_rsvd
ix_priv
ix_len
ix_PktLen
IX_OSAL_MBUF_NEXT_PKT_IN_CHAIN_PTR
IX_OSAL_MBUF_MDATA
IX_OSAL_MBUF_MLEN
IX_OSAL_MBUF_MTYPE/MFLAGS
IX_OSAL_MBUF_NEXT_BUFFER_IN_PKT_PTR
IX_OSAL_MBUF_PKT_LEN
IX_OSAL_MBUF_PRIV
Cache Line
IX_OSAL_MBUF_OSBUF_PTR
IX_OSAL_MBUF_NET_POOL
IX_OSAL_MBUF_ALLOCATED_MBUF_DATA
IX_OSAL_MBUF_SIGNATURE
IX_OSAL_MBUF_ALLOCATED_MBUF_LEN
Cache Line
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved (Shared with NPE)
Reserved
Reserved
User visible
Shared with NPE
IXP400 SW v1.4
Reserved for NPE-Service specific usage
Used by Intel IXP400 SW v1.5 for pool management / Reserved
Fields used by Intel IXP400 version 1.4
OS dependent fields, may be modified by access-layer componentUser visible
OS dependent fields, not modified by access-layer component
v1.5 Pool management
ix_allocated_data
ix_pool
ix_osbuf_ptr
ix_chain
ix_allocated_len
ix_signature