freebsd-dev/sys/net/altq/altq_fairq.c
Luiz Otavio O Souza 0a70aaf8f5 Add ALTQ(9) support for the CoDel algorithm.
CoDel is a parameterless queue discipline that handles variable bandwidth
and RTT.

It can be used as the single queue discipline on an interface or as a sub
discipline of existing queue disciplines such as PRIQ, CBQ, HFSC, FAIRQ.

Differential Revision:	https://reviews.freebsd.org/D3272
Reviewd by:	rpaulo, gnn (previous version)
Obtained from:	pfSense
Sponsored by:	Rubicon Communications (Netgate)
2015-08-21 22:02:22 +00:00

910 lines
22 KiB
C

/*
* Copyright (c) 2008 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Matthew Dillon <dillon@backplane.com>
*
* 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. Neither the name of The DragonFly Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific, prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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.
*
* $DragonFly: src/sys/net/altq/altq_fairq.c,v 1.1 2008/04/06 18:58:15 dillon Exp $
* $FreeBSD$
*/
/*
* Matt: I gutted altq_priq.c and used it as a skeleton on which to build
* fairq. The fairq algorithm is completely different then priq, of course,
* but because I used priq's skeleton I believe I should include priq's
* copyright.
*
* Copyright (C) 2000-2003
* 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.
*/
/*
* FAIRQ - take traffic classified by keep state (hashed into
* mbuf->m_pkthdr.altq_state_hash) and bucketize it. Fairly extract
* the first packet from each bucket in a round-robin fashion.
*
* TODO - better overall qlimit support (right now it is per-bucket).
* - NOTE: red etc is per bucket, not overall.
* - better service curve support.
*
* EXAMPLE:
*
* altq on em0 fairq bandwidth 650Kb queue { std, bulk }
* queue std priority 3 bandwidth 400Kb \
* fairq (buckets 64, default, hogs 1Kb) qlimit 50
* queue bulk priority 2 bandwidth 100Kb \
* fairq (buckets 64, hogs 1Kb) qlimit 50
*
* pass out on em0 from any to any keep state queue std
* pass out on em0 inet proto tcp ..... port ... keep state queue bulk
*/
#include "opt_altq.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#ifdef ALTQ_FAIRQ /* fairq is enabled in the kernel conf */
#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 <sys/queue.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netpfil/pf/pf.h>
#include <netpfil/pf/pf_altq.h>
#include <netpfil/pf/pf_mtag.h>
#include <net/altq/altq.h>
#include <net/altq/altq_fairq.h>
/*
* function prototypes
*/
static int fairq_clear_interface(struct fairq_if *);
static int fairq_request(struct ifaltq *, int, void *);
static void fairq_purge(struct fairq_if *);
static struct fairq_class *fairq_class_create(struct fairq_if *, int, int, u_int, struct fairq_opts *, int);
static int fairq_class_destroy(struct fairq_class *);
static int fairq_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *);
static struct mbuf *fairq_dequeue(struct ifaltq *, int);
static int fairq_addq(struct fairq_class *, struct mbuf *, u_int32_t);
static struct mbuf *fairq_getq(struct fairq_class *, uint64_t);
static struct mbuf *fairq_pollq(struct fairq_class *, uint64_t, int *);
static fairq_bucket_t *fairq_selectq(struct fairq_class *, int);
static void fairq_purgeq(struct fairq_class *);
static void get_class_stats(struct fairq_classstats *, struct fairq_class *);
static struct fairq_class *clh_to_clp(struct fairq_if *, uint32_t);
int
fairq_pfattach(struct pf_altq *a)
{
struct ifnet *ifp;
int error;
if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL)
return (EINVAL);
error = altq_attach(&ifp->if_snd, ALTQT_FAIRQ, a->altq_disc,
fairq_enqueue, fairq_dequeue, fairq_request, NULL, NULL);
return (error);
}
int
fairq_add_altq(struct pf_altq *a)
{
struct fairq_if *pif;
struct ifnet *ifp;
if ((ifp = ifunit(a->ifname)) == NULL)
return (EINVAL);
if (!ALTQ_IS_READY(&ifp->if_snd))
return (ENODEV);
pif = malloc(sizeof(struct fairq_if),
M_DEVBUF, M_WAITOK | M_ZERO);
pif->pif_bandwidth = a->ifbandwidth;
pif->pif_maxpri = -1;
pif->pif_ifq = &ifp->if_snd;
/* keep the state in pf_altq */
a->altq_disc = pif;
return (0);
}
int
fairq_remove_altq(struct pf_altq *a)
{
struct fairq_if *pif;
if ((pif = a->altq_disc) == NULL)
return (EINVAL);
a->altq_disc = NULL;
fairq_clear_interface(pif);
free(pif, M_DEVBUF);
return (0);
}
int
fairq_add_queue(struct pf_altq *a)
{
struct fairq_if *pif;
struct fairq_class *cl;
if ((pif = a->altq_disc) == NULL)
return (EINVAL);
/* check parameters */
if (a->priority >= FAIRQ_MAXPRI)
return (EINVAL);
if (a->qid == 0)
return (EINVAL);
if (pif->pif_classes[a->priority] != NULL)
return (EBUSY);
if (clh_to_clp(pif, a->qid) != NULL)
return (EBUSY);
cl = fairq_class_create(pif, a->priority, a->qlimit, a->bandwidth,
&a->pq_u.fairq_opts, a->qid);
if (cl == NULL)
return (ENOMEM);
return (0);
}
int
fairq_remove_queue(struct pf_altq *a)
{
struct fairq_if *pif;
struct fairq_class *cl;
if ((pif = a->altq_disc) == NULL)
return (EINVAL);
if ((cl = clh_to_clp(pif, a->qid)) == NULL)
return (EINVAL);
return (fairq_class_destroy(cl));
}
int
fairq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes)
{
struct fairq_if *pif;
struct fairq_class *cl;
struct fairq_classstats stats;
int error = 0;
if ((pif = altq_lookup(a->ifname, ALTQT_FAIRQ)) == NULL)
return (EBADF);
if ((cl = clh_to_clp(pif, a->qid)) == NULL)
return (EINVAL);
if (*nbytes < sizeof(stats))
return (EINVAL);
get_class_stats(&stats, cl);
if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0)
return (error);
*nbytes = sizeof(stats);
return (0);
}
/*
* bring the interface back to the initial state by discarding
* all the filters and classes.
*/
static int
fairq_clear_interface(struct fairq_if *pif)
{
struct fairq_class *cl;
int pri;
/* clear out the classes */
for (pri = 0; pri <= pif->pif_maxpri; pri++) {
if ((cl = pif->pif_classes[pri]) != NULL)
fairq_class_destroy(cl);
}
return (0);
}
static int
fairq_request(struct ifaltq *ifq, int req, void *arg)
{
struct fairq_if *pif = (struct fairq_if *)ifq->altq_disc;
IFQ_LOCK_ASSERT(ifq);
switch (req) {
case ALTRQ_PURGE:
fairq_purge(pif);
break;
}
return (0);
}
/* discard all the queued packets on the interface */
static void
fairq_purge(struct fairq_if *pif)
{
struct fairq_class *cl;
int pri;
for (pri = 0; pri <= pif->pif_maxpri; pri++) {
if ((cl = pif->pif_classes[pri]) != NULL && cl->cl_head)
fairq_purgeq(cl);
}
if (ALTQ_IS_ENABLED(pif->pif_ifq))
pif->pif_ifq->ifq_len = 0;
}
static struct fairq_class *
fairq_class_create(struct fairq_if *pif, int pri, int qlimit,
u_int bandwidth, struct fairq_opts *opts, int qid)
{
struct fairq_class *cl;
int flags = opts->flags;
u_int nbuckets = opts->nbuckets;
int i;
#ifndef ALTQ_RED
if (flags & FARF_RED) {
#ifdef ALTQ_DEBUG
printf("fairq_class_create: RED not configured for FAIRQ!\n");
#endif
return (NULL);
}
#endif
#ifndef ALTQ_CODEL
if (flags & FARF_CODEL) {
#ifdef ALTQ_DEBUG
printf("fairq_class_create: CODEL not configured for FAIRQ!\n");
#endif
return (NULL);
}
#endif
if (nbuckets == 0)
nbuckets = 256;
if (nbuckets > FAIRQ_MAX_BUCKETS)
nbuckets = FAIRQ_MAX_BUCKETS;
/* enforce power-of-2 size */
while ((nbuckets ^ (nbuckets - 1)) != ((nbuckets << 1) - 1))
++nbuckets;
if ((cl = pif->pif_classes[pri]) != NULL) {
/* modify the class instead of creating a new one */
IFQ_LOCK(cl->cl_pif->pif_ifq);
if (cl->cl_head)
fairq_purgeq(cl);
IFQ_UNLOCK(cl->cl_pif->pif_ifq);
#ifdef ALTQ_RIO
if (cl->cl_qtype == Q_RIO)
rio_destroy((rio_t *)cl->cl_red);
#endif
#ifdef ALTQ_RED
if (cl->cl_qtype == Q_RED)
red_destroy(cl->cl_red);
#endif
#ifdef ALTQ_CODEL
if (cl->cl_qtype == Q_CODEL)
codel_destroy(cl->cl_codel);
#endif
} else {
cl = malloc(sizeof(struct fairq_class),
M_DEVBUF, M_WAITOK | M_ZERO);
cl->cl_nbuckets = nbuckets;
cl->cl_nbucket_mask = nbuckets - 1;
cl->cl_buckets = malloc(
sizeof(struct fairq_bucket) * cl->cl_nbuckets,
M_DEVBUF, M_WAITOK | M_ZERO);
cl->cl_head = NULL;
}
pif->pif_classes[pri] = cl;
if (flags & FARF_DEFAULTCLASS)
pif->pif_default = cl;
if (qlimit == 0)
qlimit = 50; /* use default */
cl->cl_qlimit = qlimit;
for (i = 0; i < cl->cl_nbuckets; ++i) {
qlimit(&cl->cl_buckets[i].queue) = qlimit;
}
cl->cl_bandwidth = bandwidth / 8;
cl->cl_qtype = Q_DROPTAIL;
cl->cl_flags = flags & FARF_USERFLAGS;
cl->cl_pri = pri;
if (pri > pif->pif_maxpri)
pif->pif_maxpri = pri;
cl->cl_pif = pif;
cl->cl_handle = qid;
cl->cl_hogs_m1 = opts->hogs_m1 / 8;
cl->cl_lssc_m1 = opts->lssc_m1 / 8; /* NOT YET USED */
#ifdef ALTQ_RED
if (flags & (FARF_RED|FARF_RIO)) {
int red_flags, red_pkttime;
red_flags = 0;
if (flags & FARF_ECN)
red_flags |= REDF_ECN;
#ifdef ALTQ_RIO
if (flags & FARF_CLEARDSCP)
red_flags |= RIOF_CLEARDSCP;
#endif
if (pif->pif_bandwidth < 8)
red_pkttime = 1000 * 1000 * 1000; /* 1 sec */
else
red_pkttime = (int64_t)pif->pif_ifq->altq_ifp->if_mtu
* 1000 * 1000 * 1000 / (pif->pif_bandwidth / 8);
#ifdef ALTQ_RIO
if (flags & FARF_RIO) {
cl->cl_red = (red_t *)rio_alloc(0, NULL,
red_flags, red_pkttime);
if (cl->cl_red != NULL)
cl->cl_qtype = Q_RIO;
} else
#endif
if (flags & FARF_RED) {
cl->cl_red = red_alloc(0, 0,
cl->cl_qlimit * 10/100,
cl->cl_qlimit * 30/100,
red_flags, red_pkttime);
if (cl->cl_red != NULL)
cl->cl_qtype = Q_RED;
}
}
#endif /* ALTQ_RED */
#ifdef ALTQ_CODEL
if (flags & FARF_CODEL) {
cl->cl_codel = codel_alloc(5, 100, 0);
if (cl->cl_codel != NULL)
cl->cl_qtype = Q_CODEL;
}
#endif
return (cl);
}
static int
fairq_class_destroy(struct fairq_class *cl)
{
struct fairq_if *pif;
int pri;
IFQ_LOCK(cl->cl_pif->pif_ifq);
if (cl->cl_head)
fairq_purgeq(cl);
pif = cl->cl_pif;
pif->pif_classes[cl->cl_pri] = NULL;
if (pif->pif_poll_cache == cl)
pif->pif_poll_cache = NULL;
if (pif->pif_maxpri == cl->cl_pri) {
for (pri = cl->cl_pri; pri >= 0; pri--)
if (pif->pif_classes[pri] != NULL) {
pif->pif_maxpri = pri;
break;
}
if (pri < 0)
pif->pif_maxpri = -1;
}
IFQ_UNLOCK(cl->cl_pif->pif_ifq);
if (cl->cl_red != NULL) {
#ifdef ALTQ_RIO
if (cl->cl_qtype == Q_RIO)
rio_destroy((rio_t *)cl->cl_red);
#endif
#ifdef ALTQ_RED
if (cl->cl_qtype == Q_RED)
red_destroy(cl->cl_red);
#endif
#ifdef ALTQ_CODEL
if (cl->cl_qtype == Q_CODEL)
codel_destroy(cl->cl_codel);
#endif
}
free(cl->cl_buckets, M_DEVBUF);
free(cl, M_DEVBUF);
return (0);
}
/*
* fairq_enqueue is an enqueue function to be registered to
* (*altq_enqueue) in struct ifaltq.
*/
static int
fairq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr)
{
struct fairq_if *pif = (struct fairq_if *)ifq->altq_disc;
struct fairq_class *cl = NULL; /* Make compiler happy */
struct pf_mtag *t;
u_int32_t qid_hash = 0;
int len;
IFQ_LOCK_ASSERT(ifq);
/* grab class set by classifier */
if ((m->m_flags & M_PKTHDR) == 0) {
/* should not happen */
printf("altq: packet for %s does not have pkthdr\n",
ifq->altq_ifp->if_xname);
m_freem(m);
return (ENOBUFS);
}
if ((t = pf_find_mtag(m)) != NULL) {
cl = clh_to_clp(pif, t->qid);
qid_hash = t->qid_hash;
}
if (cl == NULL) {
cl = pif->pif_default;
if (cl == NULL) {
m_freem(m);
return (ENOBUFS);
}
}
cl->cl_flags |= FARF_HAS_PACKETS;
cl->cl_pktattr = NULL;
len = m_pktlen(m);
if (fairq_addq(cl, m, qid_hash) != 0) {
/* drop occurred. mbuf was freed in fairq_addq. */
PKTCNTR_ADD(&cl->cl_dropcnt, len);
return (ENOBUFS);
}
IFQ_INC_LEN(ifq);
return (0);
}
/*
* fairq_dequeue is a dequeue function to be registered to
* (*altq_dequeue) in struct ifaltq.
*
* note: ALTDQ_POLL returns the next packet without removing the packet
* from the queue. ALTDQ_REMOVE is a normal dequeue operation.
* ALTDQ_REMOVE must return the same packet if called immediately
* after ALTDQ_POLL.
*/
static struct mbuf *
fairq_dequeue(struct ifaltq *ifq, int op)
{
struct fairq_if *pif = (struct fairq_if *)ifq->altq_disc;
struct fairq_class *cl;
struct fairq_class *best_cl;
struct mbuf *best_m;
struct mbuf *m = NULL;
uint64_t cur_time = read_machclk();
int pri;
int hit_limit;
IFQ_LOCK_ASSERT(ifq);
if (IFQ_IS_EMPTY(ifq)) {
return (NULL);
}
if (pif->pif_poll_cache && op == ALTDQ_REMOVE) {
best_cl = pif->pif_poll_cache;
m = fairq_getq(best_cl, cur_time);
pif->pif_poll_cache = NULL;
if (m) {
IFQ_DEC_LEN(ifq);
PKTCNTR_ADD(&best_cl->cl_xmitcnt, m_pktlen(m));
return (m);
}
} else {
best_cl = NULL;
best_m = NULL;
for (pri = pif->pif_maxpri; pri >= 0; pri--) {
if ((cl = pif->pif_classes[pri]) == NULL)
continue;
if ((cl->cl_flags & FARF_HAS_PACKETS) == 0)
continue;
m = fairq_pollq(cl, cur_time, &hit_limit);
if (m == NULL) {
cl->cl_flags &= ~FARF_HAS_PACKETS;
continue;
}
/*
* Only override the best choice if we are under
* the BW limit.
*/
if (hit_limit == 0 || best_cl == NULL) {
best_cl = cl;
best_m = m;
}
/*
* Remember the highest priority mbuf in case we
* do not find any lower priority mbufs.
*/
if (hit_limit)
continue;
break;
}
if (op == ALTDQ_POLL) {
pif->pif_poll_cache = best_cl;
m = best_m;
} else if (best_cl) {
m = fairq_getq(best_cl, cur_time);
if (m != NULL) {
IFQ_DEC_LEN(ifq);
PKTCNTR_ADD(&best_cl->cl_xmitcnt, m_pktlen(m));
}
}
return (m);
}
return (NULL);
}
static int
fairq_addq(struct fairq_class *cl, struct mbuf *m, u_int32_t bucketid)
{
fairq_bucket_t *b;
u_int hindex;
uint64_t bw;
/*
* If the packet doesn't have any keep state put it on the end of
* our queue. XXX this can result in out of order delivery.
*/
if (bucketid == 0) {
if (cl->cl_head)
b = cl->cl_head->prev;
else
b = &cl->cl_buckets[0];
} else {
hindex = bucketid & cl->cl_nbucket_mask;
b = &cl->cl_buckets[hindex];
}
/*
* Add the bucket to the end of the circular list of active buckets.
*
* As a special case we add the bucket to the beginning of the list
* instead of the end if it was not previously on the list and if
* its traffic is less then the hog level.
*/
if (b->in_use == 0) {
b->in_use = 1;
if (cl->cl_head == NULL) {
cl->cl_head = b;
b->next = b;
b->prev = b;
} else {
b->next = cl->cl_head;
b->prev = cl->cl_head->prev;
b->prev->next = b;
b->next->prev = b;
if (b->bw_delta && cl->cl_hogs_m1) {
bw = b->bw_bytes * machclk_freq / b->bw_delta;
if (bw < cl->cl_hogs_m1)
cl->cl_head = b;
}
}
}
#ifdef ALTQ_RIO
if (cl->cl_qtype == Q_RIO)
return rio_addq((rio_t *)cl->cl_red, &b->queue, m, cl->cl_pktattr);
#endif
#ifdef ALTQ_RED
if (cl->cl_qtype == Q_RED)
return red_addq(cl->cl_red, &b->queue, m, cl->cl_pktattr);
#endif
#ifdef ALTQ_CODEL
if (cl->cl_qtype == Q_CODEL)
return codel_addq(cl->cl_codel, &b->queue, m);
#endif
if (qlen(&b->queue) >= qlimit(&b->queue)) {
m_freem(m);
return (-1);
}
if (cl->cl_flags & FARF_CLEARDSCP)
write_dsfield(m, cl->cl_pktattr, 0);
_addq(&b->queue, m);
return (0);
}
static struct mbuf *
fairq_getq(struct fairq_class *cl, uint64_t cur_time)
{
fairq_bucket_t *b;
struct mbuf *m;
b = fairq_selectq(cl, 0);
if (b == NULL)
m = NULL;
#ifdef ALTQ_RIO
else if (cl->cl_qtype == Q_RIO)
m = rio_getq((rio_t *)cl->cl_red, &b->queue);
#endif
#ifdef ALTQ_RED
else if (cl->cl_qtype == Q_RED)
m = red_getq(cl->cl_red, &b->queue);
#endif
#ifdef ALTQ_CODEL
else if (cl->cl_qtype == Q_CODEL)
m = codel_getq(cl->cl_codel, &b->queue);
#endif
else
m = _getq(&b->queue);
/*
* Calculate the BW change
*/
if (m != NULL) {
uint64_t delta;
/*
* Per-class bandwidth calculation
*/
delta = (cur_time - cl->cl_last_time);
if (delta > machclk_freq * 8)
delta = machclk_freq * 8;
cl->cl_bw_delta += delta;
cl->cl_bw_bytes += m->m_pkthdr.len;
cl->cl_last_time = cur_time;
cl->cl_bw_delta -= cl->cl_bw_delta >> 3;
cl->cl_bw_bytes -= cl->cl_bw_bytes >> 3;
/*
* Per-bucket bandwidth calculation
*/
delta = (cur_time - b->last_time);
if (delta > machclk_freq * 8)
delta = machclk_freq * 8;
b->bw_delta += delta;
b->bw_bytes += m->m_pkthdr.len;
b->last_time = cur_time;
b->bw_delta -= b->bw_delta >> 3;
b->bw_bytes -= b->bw_bytes >> 3;
}
return(m);
}
/*
* Figure out what the next packet would be if there were no limits. If
* this class hits its bandwidth limit *hit_limit is set to no-zero, otherwise
* it is set to 0. A non-NULL mbuf is returned either way.
*/
static struct mbuf *
fairq_pollq(struct fairq_class *cl, uint64_t cur_time, int *hit_limit)
{
fairq_bucket_t *b;
struct mbuf *m;
uint64_t delta;
uint64_t bw;
*hit_limit = 0;
b = fairq_selectq(cl, 1);
if (b == NULL)
return(NULL);
m = qhead(&b->queue);
/*
* Did this packet exceed the class bandwidth? Calculate the
* bandwidth component of the packet.
*
* - Calculate bytes per second
*/
delta = cur_time - cl->cl_last_time;
if (delta > machclk_freq * 8)
delta = machclk_freq * 8;
cl->cl_bw_delta += delta;
cl->cl_last_time = cur_time;
if (cl->cl_bw_delta) {
bw = cl->cl_bw_bytes * machclk_freq / cl->cl_bw_delta;
if (bw > cl->cl_bandwidth)
*hit_limit = 1;
#ifdef ALTQ_DEBUG
printf("BW %6ju relative to %6u %d queue %p\n",
(uintmax_t)bw, cl->cl_bandwidth, *hit_limit, b);
#endif
}
return(m);
}
/*
* Locate the next queue we want to pull a packet out of. This code
* is also responsible for removing empty buckets from the circular list.
*/
static
fairq_bucket_t *
fairq_selectq(struct fairq_class *cl, int ispoll)
{
fairq_bucket_t *b;
uint64_t bw;
if (ispoll == 0 && cl->cl_polled) {
b = cl->cl_polled;
cl->cl_polled = NULL;
return(b);
}
while ((b = cl->cl_head) != NULL) {
/*
* Remove empty queues from consideration
*/
if (qempty(&b->queue)) {
b->in_use = 0;
cl->cl_head = b->next;
if (cl->cl_head == b) {
cl->cl_head = NULL;
} else {
b->next->prev = b->prev;
b->prev->next = b->next;
}
continue;
}
/*
* Advance the round robin. Queues with bandwidths less
* then the hog bandwidth are allowed to burst.
*/
if (cl->cl_hogs_m1 == 0) {
cl->cl_head = b->next;
} else if (b->bw_delta) {
bw = b->bw_bytes * machclk_freq / b->bw_delta;
if (bw >= cl->cl_hogs_m1) {
cl->cl_head = b->next;
}
/*
* XXX TODO -
*/
}
/*
* Return bucket b.
*/
break;
}
if (ispoll)
cl->cl_polled = b;
return(b);
}
static void
fairq_purgeq(struct fairq_class *cl)
{
fairq_bucket_t *b;
struct mbuf *m;
while ((b = fairq_selectq(cl, 0)) != NULL) {
while ((m = _getq(&b->queue)) != NULL) {
PKTCNTR_ADD(&cl->cl_dropcnt, m_pktlen(m));
m_freem(m);
}
ASSERT(qlen(&b->queue) == 0);
}
}
static void
get_class_stats(struct fairq_classstats *sp, struct fairq_class *cl)
{
fairq_bucket_t *b;
sp->class_handle = cl->cl_handle;
sp->qlimit = cl->cl_qlimit;
sp->xmit_cnt = cl->cl_xmitcnt;
sp->drop_cnt = cl->cl_dropcnt;
sp->qtype = cl->cl_qtype;
sp->qlength = 0;
if (cl->cl_head) {
b = cl->cl_head;
do {
sp->qlength += qlen(&b->queue);
b = b->next;
} while (b != cl->cl_head);
}
#ifdef ALTQ_RED
if (cl->cl_qtype == Q_RED)
red_getstats(cl->cl_red, &sp->red[0]);
#endif
#ifdef ALTQ_RIO
if (cl->cl_qtype == Q_RIO)
rio_getstats((rio_t *)cl->cl_red, &sp->red[0]);
#endif
#ifdef ALTQ_CODEL
if (cl->cl_qtype == Q_CODEL)
codel_getstats(cl->cl_codel, &sp->codel);
#endif
}
/* convert a class handle to the corresponding class pointer */
static struct fairq_class *
clh_to_clp(struct fairq_if *pif, uint32_t chandle)
{
struct fairq_class *cl;
int idx;
if (chandle == 0)
return (NULL);
for (idx = pif->pif_maxpri; idx >= 0; idx--)
if ((cl = pif->pif_classes[idx]) != NULL &&
cl->cl_handle == chandle)
return (cl);
return (NULL);
}
#endif /* ALTQ_FAIRQ */