451 lines
12 KiB
C
451 lines
12 KiB
C
/*-
|
|
* Copyright (C) 1998-2003
|
|
* Sony Computer Science Laboratories Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
/*-
|
|
* Copyright (c) 1990-1994 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the Computer Systems
|
|
* Engineering Group at Lawrence Berkeley Laboratory.
|
|
* 4. Neither the name of the University nor of the Laboratory may be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $KAME: altq_rio.c,v 1.17 2003/07/10 12:07:49 kjc Exp $
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_altq.h"
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#ifdef ALTQ_RIO /* rio is enabled by ALTQ_RIO option in opt_altq.h */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/errno.h>
|
|
#if 1 /* ALTQ3_COMPAT */
|
|
#include <sys/proc.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/kernel.h>
|
|
#endif
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#endif
|
|
|
|
#include <netpfil/pf/pf.h>
|
|
#include <netpfil/pf/pf_altq.h>
|
|
#include <net/altq/altq.h>
|
|
#include <net/altq/altq_cdnr.h>
|
|
#include <net/altq/altq_red.h>
|
|
#include <net/altq/altq_rio.h>
|
|
|
|
/*
|
|
* RIO: RED with IN/OUT bit
|
|
* described in
|
|
* "Explicit Allocation of Best Effort Packet Delivery Service"
|
|
* David D. Clark and Wenjia Fang, MIT Lab for Computer Science
|
|
* http://diffserv.lcs.mit.edu/Papers/exp-alloc-ddc-wf.{ps,pdf}
|
|
*
|
|
* this implementation is extended to support more than 2 drop precedence
|
|
* values as described in RFC2597 (Assured Forwarding PHB Group).
|
|
*
|
|
*/
|
|
/*
|
|
* AF DS (differentiated service) codepoints.
|
|
* (classes can be mapped to CBQ or H-FSC classes.)
|
|
*
|
|
* 0 1 2 3 4 5 6 7
|
|
* +---+---+---+---+---+---+---+---+
|
|
* | CLASS |DropPre| 0 | CU |
|
|
* +---+---+---+---+---+---+---+---+
|
|
*
|
|
* class 1: 001
|
|
* class 2: 010
|
|
* class 3: 011
|
|
* class 4: 100
|
|
*
|
|
* low drop prec: 01
|
|
* medium drop prec: 10
|
|
* high drop prec: 01
|
|
*/
|
|
|
|
/* normal red parameters */
|
|
#define W_WEIGHT 512 /* inverse of weight of EWMA (511/512) */
|
|
/* q_weight = 0.00195 */
|
|
|
|
/* red parameters for a slow link */
|
|
#define W_WEIGHT_1 128 /* inverse of weight of EWMA (127/128) */
|
|
/* q_weight = 0.0078125 */
|
|
|
|
/* red parameters for a very slow link (e.g., dialup) */
|
|
#define W_WEIGHT_2 64 /* inverse of weight of EWMA (63/64) */
|
|
/* q_weight = 0.015625 */
|
|
|
|
/* fixed-point uses 12-bit decimal places */
|
|
#define FP_SHIFT 12 /* fixed-point shift */
|
|
|
|
/* red parameters for drop probability */
|
|
#define INV_P_MAX 10 /* inverse of max drop probability */
|
|
#define TH_MIN 5 /* min threshold */
|
|
#define TH_MAX 15 /* max threshold */
|
|
|
|
#define RIO_LIMIT 60 /* default max queue length */
|
|
#define RIO_STATS /* collect statistics */
|
|
|
|
#define TV_DELTA(a, b, delta) { \
|
|
int xxs; \
|
|
\
|
|
delta = (a)->tv_usec - (b)->tv_usec; \
|
|
if ((xxs = (a)->tv_sec - (b)->tv_sec) != 0) { \
|
|
if (xxs < 0) { \
|
|
delta = 60000000; \
|
|
} else if (xxs > 4) { \
|
|
if (xxs > 60) \
|
|
delta = 60000000; \
|
|
else \
|
|
delta += xxs * 1000000; \
|
|
} else while (xxs > 0) { \
|
|
delta += 1000000; \
|
|
xxs--; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/* default rio parameter values */
|
|
static struct redparams default_rio_params[RIO_NDROPPREC] = {
|
|
/* th_min, th_max, inv_pmax */
|
|
{ TH_MAX * 2 + TH_MIN, TH_MAX * 3, INV_P_MAX }, /* low drop precedence */
|
|
{ TH_MAX + TH_MIN, TH_MAX * 2, INV_P_MAX }, /* medium drop precedence */
|
|
{ TH_MIN, TH_MAX, INV_P_MAX } /* high drop precedence */
|
|
};
|
|
|
|
/* internal function prototypes */
|
|
static int dscp2index(u_int8_t);
|
|
|
|
rio_t *
|
|
rio_alloc(int weight, struct redparams *params, int flags, int pkttime)
|
|
{
|
|
rio_t *rp;
|
|
int w, i;
|
|
int npkts_per_sec;
|
|
|
|
rp = malloc(sizeof(rio_t), M_DEVBUF, M_NOWAIT | M_ZERO);
|
|
if (rp == NULL)
|
|
return (NULL);
|
|
|
|
rp->rio_flags = flags;
|
|
if (pkttime == 0)
|
|
/* default packet time: 1000 bytes / 10Mbps * 8 * 1000000 */
|
|
rp->rio_pkttime = 800;
|
|
else
|
|
rp->rio_pkttime = pkttime;
|
|
|
|
if (weight != 0)
|
|
rp->rio_weight = weight;
|
|
else {
|
|
/* use default */
|
|
rp->rio_weight = W_WEIGHT;
|
|
|
|
/* when the link is very slow, adjust red parameters */
|
|
npkts_per_sec = 1000000 / rp->rio_pkttime;
|
|
if (npkts_per_sec < 50) {
|
|
/* up to about 400Kbps */
|
|
rp->rio_weight = W_WEIGHT_2;
|
|
} else if (npkts_per_sec < 300) {
|
|
/* up to about 2.4Mbps */
|
|
rp->rio_weight = W_WEIGHT_1;
|
|
}
|
|
}
|
|
|
|
/* calculate wshift. weight must be power of 2 */
|
|
w = rp->rio_weight;
|
|
for (i = 0; w > 1; i++)
|
|
w = w >> 1;
|
|
rp->rio_wshift = i;
|
|
w = 1 << rp->rio_wshift;
|
|
if (w != rp->rio_weight) {
|
|
printf("invalid weight value %d for red! use %d\n",
|
|
rp->rio_weight, w);
|
|
rp->rio_weight = w;
|
|
}
|
|
|
|
/* allocate weight table */
|
|
rp->rio_wtab = wtab_alloc(rp->rio_weight);
|
|
|
|
for (i = 0; i < RIO_NDROPPREC; i++) {
|
|
struct dropprec_state *prec = &rp->rio_precstate[i];
|
|
|
|
prec->avg = 0;
|
|
prec->idle = 1;
|
|
|
|
if (params == NULL || params[i].inv_pmax == 0)
|
|
prec->inv_pmax = default_rio_params[i].inv_pmax;
|
|
else
|
|
prec->inv_pmax = params[i].inv_pmax;
|
|
if (params == NULL || params[i].th_min == 0)
|
|
prec->th_min = default_rio_params[i].th_min;
|
|
else
|
|
prec->th_min = params[i].th_min;
|
|
if (params == NULL || params[i].th_max == 0)
|
|
prec->th_max = default_rio_params[i].th_max;
|
|
else
|
|
prec->th_max = params[i].th_max;
|
|
|
|
/*
|
|
* th_min_s and th_max_s are scaled versions of th_min
|
|
* and th_max to be compared with avg.
|
|
*/
|
|
prec->th_min_s = prec->th_min << (rp->rio_wshift + FP_SHIFT);
|
|
prec->th_max_s = prec->th_max << (rp->rio_wshift + FP_SHIFT);
|
|
|
|
/*
|
|
* precompute probability denominator
|
|
* probd = (2 * (TH_MAX-TH_MIN) / pmax) in fixed-point
|
|
*/
|
|
prec->probd = (2 * (prec->th_max - prec->th_min)
|
|
* prec->inv_pmax) << FP_SHIFT;
|
|
|
|
microtime(&prec->last);
|
|
}
|
|
|
|
return (rp);
|
|
}
|
|
|
|
void
|
|
rio_destroy(rio_t *rp)
|
|
{
|
|
wtab_destroy(rp->rio_wtab);
|
|
free(rp, M_DEVBUF);
|
|
}
|
|
|
|
void
|
|
rio_getstats(rio_t *rp, struct redstats *sp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < RIO_NDROPPREC; i++) {
|
|
bcopy(&rp->q_stats[i], sp, sizeof(struct redstats));
|
|
sp->q_avg = rp->rio_precstate[i].avg >> rp->rio_wshift;
|
|
sp++;
|
|
}
|
|
}
|
|
|
|
#if (RIO_NDROPPREC == 3)
|
|
/*
|
|
* internally, a drop precedence value is converted to an index
|
|
* starting from 0.
|
|
*/
|
|
static int
|
|
dscp2index(u_int8_t dscp)
|
|
{
|
|
int dpindex = dscp & AF_DROPPRECMASK;
|
|
|
|
if (dpindex == 0)
|
|
return (0);
|
|
return ((dpindex >> 3) - 1);
|
|
}
|
|
#endif
|
|
|
|
#if 1
|
|
/*
|
|
* kludge: when a packet is dequeued, we need to know its drop precedence
|
|
* in order to keep the queue length of each drop precedence.
|
|
* use m_pkthdr.rcvif to pass this info.
|
|
*/
|
|
#define RIOM_SET_PRECINDEX(m, idx) \
|
|
do { (m)->m_pkthdr.rcvif = (void *)((long)(idx)); } while (0)
|
|
#define RIOM_GET_PRECINDEX(m) \
|
|
({ long idx; idx = (long)((m)->m_pkthdr.rcvif); \
|
|
(m)->m_pkthdr.rcvif = NULL; idx; })
|
|
#endif
|
|
|
|
int
|
|
rio_addq(rio_t *rp, class_queue_t *q, struct mbuf *m,
|
|
struct altq_pktattr *pktattr)
|
|
{
|
|
int avg, droptype;
|
|
u_int8_t dsfield, odsfield;
|
|
int dpindex, i, n, t;
|
|
struct timeval now;
|
|
struct dropprec_state *prec;
|
|
|
|
dsfield = odsfield = read_dsfield(m, pktattr);
|
|
dpindex = dscp2index(dsfield);
|
|
|
|
/*
|
|
* update avg of the precedence states whose drop precedence
|
|
* is larger than or equal to the drop precedence of the packet
|
|
*/
|
|
now.tv_sec = 0;
|
|
for (i = dpindex; i < RIO_NDROPPREC; i++) {
|
|
prec = &rp->rio_precstate[i];
|
|
avg = prec->avg;
|
|
if (prec->idle) {
|
|
prec->idle = 0;
|
|
if (now.tv_sec == 0)
|
|
microtime(&now);
|
|
t = (now.tv_sec - prec->last.tv_sec);
|
|
if (t > 60)
|
|
avg = 0;
|
|
else {
|
|
t = t * 1000000 +
|
|
(now.tv_usec - prec->last.tv_usec);
|
|
n = t / rp->rio_pkttime;
|
|
/* calculate (avg = (1 - Wq)^n * avg) */
|
|
if (n > 0)
|
|
avg = (avg >> FP_SHIFT) *
|
|
pow_w(rp->rio_wtab, n);
|
|
}
|
|
}
|
|
|
|
/* run estimator. (avg is scaled by WEIGHT in fixed-point) */
|
|
avg += (prec->qlen << FP_SHIFT) - (avg >> rp->rio_wshift);
|
|
prec->avg = avg; /* save the new value */
|
|
/*
|
|
* count keeps a tally of arriving traffic that has not
|
|
* been dropped.
|
|
*/
|
|
prec->count++;
|
|
}
|
|
|
|
prec = &rp->rio_precstate[dpindex];
|
|
avg = prec->avg;
|
|
|
|
/* see if we drop early */
|
|
droptype = DTYPE_NODROP;
|
|
if (avg >= prec->th_min_s && prec->qlen > 1) {
|
|
if (avg >= prec->th_max_s) {
|
|
/* avg >= th_max: forced drop */
|
|
droptype = DTYPE_FORCED;
|
|
} else if (prec->old == 0) {
|
|
/* first exceeds th_min */
|
|
prec->count = 1;
|
|
prec->old = 1;
|
|
} else if (drop_early((avg - prec->th_min_s) >> rp->rio_wshift,
|
|
prec->probd, prec->count)) {
|
|
/* unforced drop by red */
|
|
droptype = DTYPE_EARLY;
|
|
}
|
|
} else {
|
|
/* avg < th_min */
|
|
prec->old = 0;
|
|
}
|
|
|
|
/*
|
|
* if the queue length hits the hard limit, it's a forced drop.
|
|
*/
|
|
if (droptype == DTYPE_NODROP && qlen(q) >= qlimit(q))
|
|
droptype = DTYPE_FORCED;
|
|
|
|
if (droptype != DTYPE_NODROP) {
|
|
/* always drop incoming packet (as opposed to randomdrop) */
|
|
for (i = dpindex; i < RIO_NDROPPREC; i++)
|
|
rp->rio_precstate[i].count = 0;
|
|
#ifdef RIO_STATS
|
|
if (droptype == DTYPE_EARLY)
|
|
rp->q_stats[dpindex].drop_unforced++;
|
|
else
|
|
rp->q_stats[dpindex].drop_forced++;
|
|
PKTCNTR_ADD(&rp->q_stats[dpindex].drop_cnt, m_pktlen(m));
|
|
#endif
|
|
m_freem(m);
|
|
return (-1);
|
|
}
|
|
|
|
for (i = dpindex; i < RIO_NDROPPREC; i++)
|
|
rp->rio_precstate[i].qlen++;
|
|
|
|
/* save drop precedence index in mbuf hdr */
|
|
RIOM_SET_PRECINDEX(m, dpindex);
|
|
|
|
if (rp->rio_flags & RIOF_CLEARDSCP)
|
|
dsfield &= ~DSCP_MASK;
|
|
|
|
if (dsfield != odsfield)
|
|
write_dsfield(m, pktattr, dsfield);
|
|
|
|
_addq(q, m);
|
|
|
|
#ifdef RIO_STATS
|
|
PKTCNTR_ADD(&rp->q_stats[dpindex].xmit_cnt, m_pktlen(m));
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
struct mbuf *
|
|
rio_getq(rio_t *rp, class_queue_t *q)
|
|
{
|
|
struct mbuf *m;
|
|
int dpindex, i;
|
|
|
|
if ((m = _getq(q)) == NULL)
|
|
return NULL;
|
|
|
|
dpindex = RIOM_GET_PRECINDEX(m);
|
|
for (i = dpindex; i < RIO_NDROPPREC; i++) {
|
|
if (--rp->rio_precstate[i].qlen == 0) {
|
|
if (rp->rio_precstate[i].idle == 0) {
|
|
rp->rio_precstate[i].idle = 1;
|
|
microtime(&rp->rio_precstate[i].last);
|
|
}
|
|
}
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
#endif /* ALTQ_RIO */
|