Hash :
1a08f436
Author :
Date :
2010-08-25T09:23:17
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\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: nbpools.fth
\
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
\
\ - Do no alter or remove copyright notices
\
\ - Redistribution and use of this software in source and binary forms, with
\ or without modification, are permitted provided that the following
\ conditions are met:
\
\ - Redistribution of source code must retain the above copyright notice,
\ this list of conditions and the following disclaimer.
\
\ - Redistribution in binary form must reproduce the above copyright notice,
\ this list of conditions and the following disclaimer in the
\ documentation and/or other materials provided with the distribution.
\
\ Neither the name of Sun Microsystems, Inc. or the names of contributors
\ may be used to endorse or promote products derived from this software
\ without specific prior written permission.
\
\ This software is provided "AS IS," without a warranty of any kind.
\ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
\ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
\ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
\ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
\ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
\ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
\ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
\ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
\ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
\ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
\ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
\
\ You acknowledge that this software is not designed, licensed or
\ intended for use in the design, construction, operation or maintenance of
\ any nuclear facility.
\
\ ========== Copyright Header End ============================================
id: @(#)nbpools.fth 1.1 04/09/07
purpose: Network buffer pool management
copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
\ To speed packet processing time, we must be able to allocate space
\ quickly and must avoid copying data as packets move between protocol
\ layers.
\
\ We preallocate many buffers large enough to hold a single packet
\ and a few buffers large enough to hold large datagrams. These
\ buffer pools are maintained as linked lists. Network level I/O is
\ performed using small buffers; large buffers are used when generating
\ or reassembling large datagrams. An entire buffer is passed to IP
\ after reading a packet into it; data needs to be copied only when
\ dealing with large datagrams.
\
\ To make buffer processing uniform, a self-identifying buffer scheme
\ is used. Each buffer entry maintains its size using which the
\ buffer is returned to the appropriate (small or large) buffer pool
\ when freed.
headerless
struct
/queue-entry field >netbuf-link \ Queue pointers
/l field >netbuf-len \ Buffer size
0 field >netbuf-adr \ Buffer contents
constant /netbuf-hdr
\ Allocate memory for a network buffer
: netbuf-alloc ( bufsize -- netbuf )
dup /netbuf-hdr + alloc-mem dup queue-init tuck >netbuf-len l!
;
\ Destroy a network buffer
: netbuf-free ( netbuf -- )
dup >netbuf-len l@ /netbuf-hdr + free-mem
;
\ Initialize a buffer pool
: netbuf-pool-create ( qhead bufsize nbufs -- )
2 pick queue-init
0 ?do 2dup netbuf-alloc enqueue loop 2drop
;
\ Destroy a buffer pool
: netbuf-pool-destroy ( qhead -- )
begin dup dequeue ?dup while netbuf-free repeat drop
;
/queue-head instance buffer: netpkt-bufq \ Network packet buffer pool
/queue-head instance buffer: lrgpkt-bufq \ Large packet buffer pool
d# 32 constant NETPKT_POOL_SIZE \ Number of network packet buffers
d# 4 constant LRGPKT_POOL_SIZE \ Number of large packet buffers
\ Allocate a frame from the network packet buffer pool
: frame-alloc ( -- frame )
netpkt-bufq dequeue dup if >netbuf-adr then
;
\ Return a frame to the network packet buffer pool
: frame-free ( frame -- )
netpkt-bufq swap /netbuf-hdr - enqueue
;
\ Allocate a packet from the network packet buffer pool
: pkt-alloc ( -- pkt )
netpkt-bufq dequeue dup if >netbuf-adr if-hdrlen@ + then
;
\ Allocate a packet from the large packet buffer pool
: lrgpkt-alloc ( -- pkt )
lrgpkt-bufq dequeue dup if >netbuf-adr if-hdrlen@ + then
;
\ Return a packet to the pool from which it was allocated
: pkt-free ( pkt -- )
if-hdrlen@ - /netbuf-hdr - ( netbuf )
dup >netbuf-len l@ if-frame-size@ = if ( netbuf )
netpkt-bufq ( netbuf netpkt-qhead )
else ( netbuf )
lrgpkt-bufq ( netbuf lrgpkt-qhead )
then ( netbuf qhead )
swap enqueue ( )
;
\ Enqueue a packet buffer in the specified queue
: pkt-enqueue ( qhead pkt -- )
if-hdrlen@ - /netbuf-hdr - enqueue
;
\ Dequeue a packet buffer from the specified queue
: pkt-dequeue ( qhead -- pkt )
dequeue dup if >netbuf-adr if-hdrlen@ + then
;
\ Initialize network buffer pools
: init-nbpools ( -- )
netpkt-bufq if-frame-size@ NETPKT_POOL_SIZE netbuf-pool-create
lrgpkt-bufq IP_MAX_PKTSIZE if-hdrlen@ + LRGPKT_POOL_SIZE netbuf-pool-create
;
\ Destroy network buffer pools
: free-nbpools ( -- )
netpkt-bufq netbuf-pool-destroy
lrgpkt-bufq netbuf-pool-destroy
;
headers