Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/altq/altq_blue.c

692 lines
17 KiB
C
Raw Blame History

/* $NetBSD: altq_blue.c,v 1.3 2001/04/13 23:29:55 thorpej Exp $ */
/* $KAME: altq_blue.c,v 1.7 2000/12/14 08:12:45 thorpej Exp $ */
/*
* Copyright (C) 1997-2000
* 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.
*/
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include "opt_altq.h"
#if (__FreeBSD__ != 2)
#include "opt_inet.h"
#ifdef __FreeBSD__
#include "opt_inet6.h"
#endif
#endif
#endif /* __FreeBSD__ || __NetBSD__ */
#ifdef ALTQ_BLUE /* blue is enabled by ALTQ_BLUE option in opt_altq.h */
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <altq/altq.h>
#include <altq/altq_conf.h>
#include <altq/altq_blue.h>
/*
* Blue is proposed and implemented by Wu-chang Feng <wuchang@eecs.umich.edu>.
* more information on Blue is available from
* http://www.eecs.umich.edu/~wuchang/blue/
*/
/* fixed-point uses 12-bit decimal places */
#define FP_SHIFT 12 /* fixed-point shift */
#define BLUE_LIMIT 200 /* default max queue lenght */
#define BLUE_STATS /* collect statistics */
/* blue_list keeps all blue_state_t's allocated. */
static blue_queue_t *blue_list = NULL;
/* internal function prototypes */
static int blue_enqueue __P((struct ifaltq *, struct mbuf *,
struct altq_pktattr *));
static struct mbuf *blue_dequeue __P((struct ifaltq *, int));
static int drop_early __P((blue_t *));
static int mark_ecn __P((struct mbuf *, struct altq_pktattr *, int));
static int blue_detach __P((blue_queue_t *));
static int blue_request __P((struct ifaltq *, int, void *));
/*
* blue device interface
*/
altqdev_decl(blue);
int
blueopen(dev, flag, fmt, p)
dev_t dev;
int flag, fmt;
struct proc *p;
{
/* everything will be done when the queueing scheme is attached. */
return 0;
}
int
blueclose(dev, flag, fmt, p)
dev_t dev;
int flag, fmt;
struct proc *p;
{
blue_queue_t *rqp;
int err, error = 0;
while ((rqp = blue_list) != NULL) {
/* destroy all */
err = blue_detach(rqp);
if (err != 0 && error == 0)
error = err;
}
return error;
}
int
blueioctl(dev, cmd, addr, flag, p)
dev_t dev;
ioctlcmd_t cmd;
caddr_t addr;
int flag;
struct proc *p;
{
blue_queue_t *rqp;
struct blue_interface *ifacep;
struct ifnet *ifp;
int error = 0;
/* check super-user privilege */
switch (cmd) {
case BLUE_GETSTATS:
break;
default:
#if (__FreeBSD_version > 400000)
if ((error = suser(p)) != 0)
return (error);
#else
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
#endif
break;
}
switch (cmd) {
case BLUE_ENABLE:
ifacep = (struct blue_interface *)addr;
if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) {
error = EBADF;
break;
}
error = altq_enable(rqp->rq_ifq);
break;
case BLUE_DISABLE:
ifacep = (struct blue_interface *)addr;
if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) {
error = EBADF;
break;
}
error = altq_disable(rqp->rq_ifq);
break;
case BLUE_IF_ATTACH:
ifp = ifunit(((struct blue_interface *)addr)->blue_ifname);
if (ifp == NULL) {
error = ENXIO;
break;
}
/* allocate and initialize blue_state_t */
MALLOC(rqp, blue_queue_t *, sizeof(blue_queue_t), M_DEVBUF, M_WAITOK);
bzero(rqp, sizeof(blue_queue_t));
MALLOC(rqp->rq_q, class_queue_t *, sizeof(class_queue_t),
M_DEVBUF, M_WAITOK);
bzero(rqp->rq_q, sizeof(class_queue_t));
MALLOC(rqp->rq_blue, blue_t *, sizeof(blue_t), M_DEVBUF, M_WAITOK);
bzero(rqp->rq_blue, sizeof(blue_t));
rqp->rq_ifq = &ifp->if_snd;
qtail(rqp->rq_q) = NULL;
qlen(rqp->rq_q) = 0;
qlimit(rqp->rq_q) = BLUE_LIMIT;
/* default packet time: 1000 bytes / 10Mbps * 8 * 1000000 */
blue_init(rqp->rq_blue, 0, 800, 1000, 50000);
/*
* set BLUE to this ifnet structure.
*/
error = altq_attach(rqp->rq_ifq, ALTQT_BLUE, rqp,
blue_enqueue, blue_dequeue, blue_request,
NULL, NULL);
if (error) {
FREE(rqp->rq_blue, M_DEVBUF);
FREE(rqp->rq_q, M_DEVBUF);
FREE(rqp, M_DEVBUF);
break;
}
/* add this state to the blue list */
rqp->rq_next = blue_list;
blue_list = rqp;
break;
case BLUE_IF_DETACH:
ifacep = (struct blue_interface *)addr;
if ((rqp = altq_lookup(ifacep->blue_ifname, ALTQT_BLUE)) == NULL) {
error = EBADF;
break;
}
error = blue_detach(rqp);
break;
case BLUE_GETSTATS:
do {
struct blue_stats *q_stats;
blue_t *rp;
q_stats = (struct blue_stats *)addr;
if ((rqp = altq_lookup(q_stats->iface.blue_ifname,
ALTQT_BLUE)) == NULL) {
error = EBADF;
break;
}
q_stats->q_len = qlen(rqp->rq_q);
q_stats->q_limit = qlimit(rqp->rq_q);
rp = rqp->rq_blue;
q_stats->q_pmark = rp->blue_pmark;
q_stats->xmit_packets = rp->blue_stats.xmit_packets;
q_stats->xmit_bytes = rp->blue_stats.xmit_bytes;
q_stats->drop_packets = rp->blue_stats.drop_packets;
q_stats->drop_bytes = rp->blue_stats.drop_bytes;
q_stats->drop_forced = rp->blue_stats.drop_forced;
q_stats->drop_unforced = rp->blue_stats.drop_unforced;
q_stats->marked_packets = rp->blue_stats.marked_packets;
} while (0);
break;
case BLUE_CONFIG:
do {
struct blue_conf *fc;
int limit;
fc = (struct blue_conf *)addr;
if ((rqp = altq_lookup(fc->iface.blue_ifname,
ALTQT_BLUE)) == NULL) {
error = EBADF;
break;
}
limit = fc->blue_limit;
qlimit(rqp->rq_q) = limit;
fc->blue_limit = limit; /* write back the new value */
if (fc->blue_pkttime > 0)
rqp->rq_blue->blue_pkttime = fc->blue_pkttime;
if (fc->blue_max_pmark > 0)
rqp->rq_blue->blue_max_pmark = fc->blue_max_pmark;
if (fc->blue_hold_time > 0)
rqp->rq_blue->blue_hold_time = fc->blue_hold_time;
rqp->rq_blue->blue_flags = fc->blue_flags;
blue_init(rqp->rq_blue, rqp->rq_blue->blue_flags,
rqp->rq_blue->blue_pkttime,
rqp->rq_blue->blue_max_pmark,
rqp->rq_blue->blue_hold_time);
} while (0);
break;
default:
error = EINVAL;
break;
}
return error;
}
static int blue_detach(rqp)
blue_queue_t *rqp;
{
blue_queue_t *tmp;
int error = 0;
if (ALTQ_IS_ENABLED(rqp->rq_ifq))
altq_disable(rqp->rq_ifq);
if ((error = altq_detach(rqp->rq_ifq)))
return (error);
if (blue_list == rqp)
blue_list = rqp->rq_next;
else {
for (tmp = blue_list; tmp != NULL; tmp = tmp->rq_next)
if (tmp->rq_next == rqp) {
tmp->rq_next = rqp->rq_next;
break;
}
if (tmp == NULL)
printf("blue_detach: no state found in blue_list!\n");
}
FREE(rqp->rq_q, M_DEVBUF);
FREE(rqp->rq_blue, M_DEVBUF);
FREE(rqp, M_DEVBUF);
return (error);
}
/*
* blue support routines
*/
int
blue_init(rp, flags, pkttime, blue_max_pmark, blue_hold_time)
blue_t *rp;
int flags;
int pkttime;
int blue_max_pmark;
int blue_hold_time;
{
int npkts_per_sec;
rp->blue_idle = 1;
rp->blue_flags = flags;
rp->blue_pkttime = pkttime;
rp->blue_max_pmark = blue_max_pmark;
rp->blue_hold_time = blue_hold_time;
if (pkttime == 0)
rp->blue_pkttime = 1;
/* when the link is very slow, adjust blue parameters */
npkts_per_sec = 1000000 / rp->blue_pkttime;
if (npkts_per_sec < 50) {
}
else if (npkts_per_sec < 300) {
}
microtime(&rp->blue_last);
return (0);
}
/*
* enqueue routine:
*
* returns: 0 when successfully queued.
* ENOBUFS when drop occurs.
*/
static int
blue_enqueue(ifq, m, pktattr)
struct ifaltq *ifq;
struct mbuf *m;
struct altq_pktattr *pktattr;
{
blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc;
int error = 0;
if (blue_addq(rqp->rq_blue, rqp->rq_q, m, pktattr) == 0)
ifq->ifq_len++;
else
error = ENOBUFS;
return error;
}
#define DTYPE_NODROP 0 /* no drop */
#define DTYPE_FORCED 1 /* a "forced" drop */
#define DTYPE_EARLY 2 /* an "unforced" (early) drop */
int
blue_addq(rp, q, m, pktattr)
blue_t *rp;
class_queue_t *q;
struct mbuf *m;
struct altq_pktattr *pktattr;
{
int droptype;
/*
* if we were idle, this is an enqueue onto an empty queue
* and we should decrement marking probability
*
*/
if (rp->blue_idle) {
struct timeval now;
int t;
rp->blue_idle = 0;
microtime(&now);
t = (now.tv_sec - rp->blue_last.tv_sec);
if ( t > 1) {
rp->blue_pmark = 1;
microtime(&rp->blue_last);
} else {
t = t * 1000000 + (now.tv_usec - rp->blue_last.tv_usec);
if (t > rp->blue_hold_time) {
rp->blue_pmark--;
if (rp->blue_pmark < 0) rp->blue_pmark = 0;
microtime(&rp->blue_last);
}
}
}
/* see if we drop early */
droptype = DTYPE_NODROP;
if (drop_early(rp) && qlen(q) > 1) {
/* mark or drop by blue */
if ((rp->blue_flags & BLUEF_ECN) &&
mark_ecn(m, pktattr, rp->blue_flags)) {
/* successfully marked. do not drop. */
#ifdef BLUE_STATS
rp->blue_stats.marked_packets++;
#endif
} else {
/* unforced drop by blue */
droptype = DTYPE_EARLY;
}
}
/*
* 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 successful or forced drop, enqueue this packet. */
if (droptype != DTYPE_EARLY)
_addq(q, m);
if (droptype != DTYPE_NODROP) {
if (droptype == DTYPE_EARLY) {
/* drop the incoming packet */
#ifdef BLUE_STATS
rp->blue_stats.drop_unforced++;
#endif
} else {
struct timeval now;
int t;
/* forced drop, select a victim packet in the queue. */
m = _getq_random(q);
microtime(&now);
t = (now.tv_sec - rp->blue_last.tv_sec);
t = t * 1000000 + (now.tv_usec - rp->blue_last.tv_usec);
if (t > rp->blue_hold_time) {
rp->blue_pmark += rp->blue_max_pmark >> 3;
if (rp->blue_pmark > rp->blue_max_pmark)
rp->blue_pmark = rp->blue_max_pmark;
microtime(&rp->blue_last);
}
#ifdef BLUE_STATS
rp->blue_stats.drop_forced++;
#endif
}
#ifdef BLUE_STATS
rp->blue_stats.drop_packets++;
rp->blue_stats.drop_bytes += m->m_pkthdr.len;
#endif
m_freem(m);
return (-1);
}
/* successfully queued */
return (0);
}
/*
* early-drop probability is kept in blue_pmark
*
*/
static int
drop_early(rp)
blue_t *rp;
{
if ((random() % rp->blue_max_pmark) < rp->blue_pmark) {
/* drop or mark */
return (1);
}
/* no drop/mark */
return (0);
}
/*
* try to mark CE bit to the packet.
* returns 1 if successfully marked, 0 otherwise.
*/
static int
mark_ecn(m, pktattr, flags)
struct mbuf *m;
struct altq_pktattr *pktattr;
int flags;
{
struct mbuf *m0;
if (pktattr == NULL ||
(pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6))
return (0);
/* verify that pattr_hdr is within the mbuf data */
for (m0 = m; m0 != NULL; m0 = m0->m_next)
if ((pktattr->pattr_hdr >= m0->m_data) &&
(pktattr->pattr_hdr < m0->m_data + m0->m_len))
break;
if (m0 == NULL) {
/* ick, pattr_hdr is stale */
pktattr->pattr_af = AF_UNSPEC;
return (0);
}
switch (pktattr->pattr_af) {
case AF_INET:
if (flags & BLUEF_ECN4) {
struct ip *ip = (struct ip *)pktattr->pattr_hdr;
if (ip->ip_v != 4)
return (0); /* version mismatch! */
if (ip->ip_tos & IPTOS_ECT) {
/* ECN-capable, mark ECN bit. */
if ((ip->ip_tos & IPTOS_CE) == 0) {
#if (IPTOS_CE == 0x01)
u_short sum;
ip->ip_tos |= IPTOS_CE;
/*
* optimized version when IPTOS_CE
* is 0x01.
* HC' = HC -1 when HC > 0
* = 0xfffe when HC = 0
*/
sum = ntohs(ip->ip_sum);
if (sum == 0)
sum = 0xfffe;
else
sum -= 1;
ip->ip_sum = htons(sum);
#else /* IPTOS_CE != 0x01 */
long sum;
ip->ip_tos |= IPTOS_CE;
/*
* update checksum (from RFC1624)
* HC' = ~(~HC + ~m + m')
*/
sum = ~ntohs(ip->ip_sum) & 0xffff;
sum += 0xffff + IPTOS_CE;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16); /* add carry */
ip->ip_sum = htons(~sum & 0xffff);
#endif /* IPTOS_CE != 0x01 */
}
return (1);
}
}
break;
#ifdef INET6
case AF_INET6:
if (flags & BLUEF_ECN6) {
struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr;
u_int32_t flowlabel;
flowlabel = ntohl(ip6->ip6_flow);
if ((flowlabel >> 28) != 6)
return (0); /* version mismatch! */
if (flowlabel & (IPTOS_ECT << 20)) {
/* ECN-capable, mark ECN bit. */
flowlabel |= (IPTOS_CE << 20);
ip6->ip6_flow = htonl(flowlabel);
return (1);
}
}
break;
#endif /* INET6 */
}
/* not marked */
return (0);
}
/*
* dequeue routine:
* must be called in splnet.
*
* returns: mbuf dequeued.
* NULL when no packet is available in the queue.
*/
static struct mbuf *
blue_dequeue(ifq, op)
struct ifaltq *ifq;
int op;
{
blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc;
struct mbuf *m = NULL;
if (op == ALTDQ_POLL)
return (qhead(rqp->rq_q));
m = blue_getq(rqp->rq_blue, rqp->rq_q);
if (m != NULL)
ifq->ifq_len--;
return m;
}
struct mbuf *blue_getq(rp, q)
blue_t *rp;
class_queue_t *q;
{
struct mbuf *m;
if ((m = _getq(q)) == NULL) {
if (rp->blue_idle == 0) {
rp->blue_idle = 1;
microtime(&rp->blue_last);
}
return NULL;
}
rp->blue_idle = 0;
#ifdef BLUE_STATS
rp->blue_stats.xmit_packets++;
rp->blue_stats.xmit_bytes += m->m_pkthdr.len;
#endif
return (m);
}
static int
blue_request(ifq, req, arg)
struct ifaltq *ifq;
int req;
void *arg;
{
blue_queue_t *rqp = (blue_queue_t *)ifq->altq_disc;
switch (req) {
case ALTRQ_PURGE:
_flushq(rqp->rq_q);
if (ALTQ_IS_ENABLED(ifq))
ifq->ifq_len = 0;
break;
}
return (0);
}
#ifdef KLD_MODULE
static struct altqsw blue_sw =
{"blue", blueopen, blueclose, blueioctl};
ALTQ_MODULE(altq_blue, ALTQT_BLUE, &blue_sw);
#endif /* KLD_MODULE */
#endif /* ALTQ_BLUE */
Reference in New Issue View Git Blame Copy Permalink