Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
630
net/sched/sch_gred.c
Normal file
630
net/sched/sch_gred.c
Normal file
@@ -0,0 +1,630 @@
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/*
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* net/sched/sch_gred.c Generic Random Early Detection queue.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002
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*
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* 991129: - Bug fix with grio mode
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* - a better sing. AvgQ mode with Grio(WRED)
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* - A finer grained VQ dequeue based on sugestion
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* from Ren Liu
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* - More error checks
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*
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*
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*
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* For all the glorious comments look at Alexey's sch_red.c
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/notifier.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#if 1 /* control */
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#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define DPRINTK(format,args...)
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#endif
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#if 0 /* data */
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#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define D2PRINTK(format,args...)
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#endif
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struct gred_sched_data;
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struct gred_sched;
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struct gred_sched_data
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{
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/* Parameters */
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u32 limit; /* HARD maximal queue length */
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u32 qth_min; /* Min average length threshold: A scaled */
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u32 qth_max; /* Max average length threshold: A scaled */
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u32 DP; /* the drop pramaters */
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char Wlog; /* log(W) */
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char Plog; /* random number bits */
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u32 Scell_max;
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u32 Rmask;
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u32 bytesin; /* bytes seen on virtualQ so far*/
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u32 packetsin; /* packets seen on virtualQ so far*/
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u32 backlog; /* bytes on the virtualQ */
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u32 forced; /* packets dropped for exceeding limits */
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u32 early; /* packets dropped as a warning */
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u32 other; /* packets dropped by invoking drop() */
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u32 pdrop; /* packets dropped because we exceeded physical queue limits */
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char Scell_log;
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u8 Stab[256];
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u8 prio; /* the prio of this vq */
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/* Variables */
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unsigned long qave; /* Average queue length: A scaled */
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int qcount; /* Packets since last random number generation */
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u32 qR; /* Cached random number */
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psched_time_t qidlestart; /* Start of idle period */
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};
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struct gred_sched
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{
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struct gred_sched_data *tab[MAX_DPs];
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u32 DPs;
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u32 def;
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u8 initd;
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u8 grio;
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u8 eqp;
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};
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static int
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gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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{
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psched_time_t now;
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struct gred_sched_data *q=NULL;
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struct gred_sched *t= qdisc_priv(sch);
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unsigned long qave=0;
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int i=0;
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if (!t->initd && skb_queue_len(&sch->q) < (sch->dev->tx_queue_len ? : 1)) {
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D2PRINTK("NO GRED Queues setup yet! Enqueued anyway\n");
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goto do_enqueue;
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}
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if ( ((skb->tc_index&0xf) > (t->DPs -1)) || !(q=t->tab[skb->tc_index&0xf])) {
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printk("GRED: setting to default (%d)\n ",t->def);
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if (!(q=t->tab[t->def])) {
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DPRINTK("GRED: setting to default FAILED! dropping!! "
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"(%d)\n ", t->def);
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goto drop;
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}
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/* fix tc_index? --could be controvesial but needed for
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requeueing */
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skb->tc_index=(skb->tc_index&0xfffffff0) | t->def;
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}
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D2PRINTK("gred_enqueue virtualQ 0x%x classid %x backlog %d "
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"general backlog %d\n",skb->tc_index&0xf,sch->handle,q->backlog,
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sch->qstats.backlog);
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/* sum up all the qaves of prios <= to ours to get the new qave*/
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if (!t->eqp && t->grio) {
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for (i=0;i<t->DPs;i++) {
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if ((!t->tab[i]) || (i==q->DP))
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continue;
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if ((t->tab[i]->prio < q->prio) && (PSCHED_IS_PASTPERFECT(t->tab[i]->qidlestart)))
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qave +=t->tab[i]->qave;
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}
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}
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q->packetsin++;
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q->bytesin+=skb->len;
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if (t->eqp && t->grio) {
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qave=0;
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q->qave=t->tab[t->def]->qave;
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q->qidlestart=t->tab[t->def]->qidlestart;
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}
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if (!PSCHED_IS_PASTPERFECT(q->qidlestart)) {
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long us_idle;
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PSCHED_GET_TIME(now);
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us_idle = PSCHED_TDIFF_SAFE(now, q->qidlestart, q->Scell_max);
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PSCHED_SET_PASTPERFECT(q->qidlestart);
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q->qave >>= q->Stab[(us_idle>>q->Scell_log)&0xFF];
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} else {
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if (t->eqp) {
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q->qave += sch->qstats.backlog - (q->qave >> q->Wlog);
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} else {
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q->qave += q->backlog - (q->qave >> q->Wlog);
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}
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}
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if (t->eqp && t->grio)
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t->tab[t->def]->qave=q->qave;
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if ((q->qave+qave) < q->qth_min) {
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q->qcount = -1;
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enqueue:
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if (q->backlog + skb->len <= q->limit) {
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q->backlog += skb->len;
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do_enqueue:
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__skb_queue_tail(&sch->q, skb);
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sch->qstats.backlog += skb->len;
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sch->bstats.bytes += skb->len;
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sch->bstats.packets++;
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return 0;
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} else {
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q->pdrop++;
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}
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drop:
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kfree_skb(skb);
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sch->qstats.drops++;
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return NET_XMIT_DROP;
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}
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if ((q->qave+qave) >= q->qth_max) {
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q->qcount = -1;
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sch->qstats.overlimits++;
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q->forced++;
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goto drop;
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}
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if (++q->qcount) {
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if ((((qave+q->qave) - q->qth_min)>>q->Wlog)*q->qcount < q->qR)
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goto enqueue;
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q->qcount = 0;
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q->qR = net_random()&q->Rmask;
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sch->qstats.overlimits++;
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q->early++;
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goto drop;
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}
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q->qR = net_random()&q->Rmask;
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goto enqueue;
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}
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static int
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gred_requeue(struct sk_buff *skb, struct Qdisc* sch)
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{
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struct gred_sched_data *q;
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struct gred_sched *t= qdisc_priv(sch);
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q= t->tab[(skb->tc_index&0xf)];
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/* error checking here -- probably unnecessary */
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PSCHED_SET_PASTPERFECT(q->qidlestart);
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__skb_queue_head(&sch->q, skb);
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sch->qstats.backlog += skb->len;
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sch->qstats.requeues++;
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q->backlog += skb->len;
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return 0;
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}
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static struct sk_buff *
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gred_dequeue(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct gred_sched_data *q;
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struct gred_sched *t= qdisc_priv(sch);
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skb = __skb_dequeue(&sch->q);
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if (skb) {
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sch->qstats.backlog -= skb->len;
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q= t->tab[(skb->tc_index&0xf)];
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if (q) {
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q->backlog -= skb->len;
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if (!q->backlog && !t->eqp)
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PSCHED_GET_TIME(q->qidlestart);
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} else {
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D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf);
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}
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return skb;
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}
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if (t->eqp) {
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q= t->tab[t->def];
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if (!q)
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D2PRINTK("no default VQ set: Results will be "
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"screwed up\n");
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else
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PSCHED_GET_TIME(q->qidlestart);
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}
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return NULL;
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}
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static unsigned int gred_drop(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct gred_sched_data *q;
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struct gred_sched *t= qdisc_priv(sch);
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skb = __skb_dequeue_tail(&sch->q);
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if (skb) {
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unsigned int len = skb->len;
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sch->qstats.backlog -= len;
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sch->qstats.drops++;
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q= t->tab[(skb->tc_index&0xf)];
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if (q) {
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q->backlog -= len;
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q->other++;
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if (!q->backlog && !t->eqp)
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PSCHED_GET_TIME(q->qidlestart);
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} else {
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D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf);
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}
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kfree_skb(skb);
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return len;
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}
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q=t->tab[t->def];
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if (!q) {
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D2PRINTK("no default VQ set: Results might be screwed up\n");
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return 0;
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}
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PSCHED_GET_TIME(q->qidlestart);
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return 0;
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}
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static void gred_reset(struct Qdisc* sch)
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{
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int i;
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struct gred_sched_data *q;
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struct gred_sched *t= qdisc_priv(sch);
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__skb_queue_purge(&sch->q);
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sch->qstats.backlog = 0;
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for (i=0;i<t->DPs;i++) {
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q= t->tab[i];
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if (!q)
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continue;
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PSCHED_SET_PASTPERFECT(q->qidlestart);
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q->qave = 0;
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q->qcount = -1;
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q->backlog = 0;
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q->other=0;
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q->forced=0;
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q->pdrop=0;
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q->early=0;
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}
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}
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static int gred_change(struct Qdisc *sch, struct rtattr *opt)
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{
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struct gred_sched *table = qdisc_priv(sch);
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struct gred_sched_data *q;
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struct tc_gred_qopt *ctl;
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struct tc_gred_sopt *sopt;
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struct rtattr *tb[TCA_GRED_STAB];
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struct rtattr *tb2[TCA_GRED_DPS];
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int i;
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if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_STAB, opt))
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return -EINVAL;
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|
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if (tb[TCA_GRED_PARMS-1] == 0 && tb[TCA_GRED_STAB-1] == 0) {
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rtattr_parse_nested(tb2, TCA_GRED_DPS, opt);
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|
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if (tb2[TCA_GRED_DPS-1] == 0)
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return -EINVAL;
|
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|
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sopt = RTA_DATA(tb2[TCA_GRED_DPS-1]);
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table->DPs=sopt->DPs;
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table->def=sopt->def_DP;
|
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table->grio=sopt->grio;
|
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table->initd=0;
|
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/* probably need to clear all the table DP entries as well */
|
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return 0;
|
||||
}
|
||||
|
||||
|
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if (!table->DPs || tb[TCA_GRED_PARMS-1] == 0 || tb[TCA_GRED_STAB-1] == 0 ||
|
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RTA_PAYLOAD(tb[TCA_GRED_PARMS-1]) < sizeof(*ctl) ||
|
||||
RTA_PAYLOAD(tb[TCA_GRED_STAB-1]) < 256)
|
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return -EINVAL;
|
||||
|
||||
ctl = RTA_DATA(tb[TCA_GRED_PARMS-1]);
|
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if (ctl->DP > MAX_DPs-1 ) {
|
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/* misbehaving is punished! Put in the default drop probability */
|
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DPRINTK("\nGRED: DP %u not in the proper range fixed. New DP "
|
||||
"set to default at %d\n",ctl->DP,table->def);
|
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ctl->DP=table->def;
|
||||
}
|
||||
|
||||
if (table->tab[ctl->DP] == NULL) {
|
||||
table->tab[ctl->DP]=kmalloc(sizeof(struct gred_sched_data),
|
||||
GFP_KERNEL);
|
||||
if (NULL == table->tab[ctl->DP])
|
||||
return -ENOMEM;
|
||||
memset(table->tab[ctl->DP], 0, (sizeof(struct gred_sched_data)));
|
||||
}
|
||||
q= table->tab[ctl->DP];
|
||||
|
||||
if (table->grio) {
|
||||
if (ctl->prio <=0) {
|
||||
if (table->def && table->tab[table->def]) {
|
||||
DPRINTK("\nGRED: DP %u does not have a prio"
|
||||
"setting default to %d\n",ctl->DP,
|
||||
table->tab[table->def]->prio);
|
||||
q->prio=table->tab[table->def]->prio;
|
||||
} else {
|
||||
DPRINTK("\nGRED: DP %u does not have a prio"
|
||||
" setting default to 8\n",ctl->DP);
|
||||
q->prio=8;
|
||||
}
|
||||
} else {
|
||||
q->prio=ctl->prio;
|
||||
}
|
||||
} else {
|
||||
q->prio=8;
|
||||
}
|
||||
|
||||
|
||||
q->DP=ctl->DP;
|
||||
q->Wlog = ctl->Wlog;
|
||||
q->Plog = ctl->Plog;
|
||||
q->limit = ctl->limit;
|
||||
q->Scell_log = ctl->Scell_log;
|
||||
q->Rmask = ctl->Plog < 32 ? ((1<<ctl->Plog) - 1) : ~0UL;
|
||||
q->Scell_max = (255<<q->Scell_log);
|
||||
q->qth_min = ctl->qth_min<<ctl->Wlog;
|
||||
q->qth_max = ctl->qth_max<<ctl->Wlog;
|
||||
q->qave=0;
|
||||
q->backlog=0;
|
||||
q->qcount = -1;
|
||||
q->other=0;
|
||||
q->forced=0;
|
||||
q->pdrop=0;
|
||||
q->early=0;
|
||||
|
||||
PSCHED_SET_PASTPERFECT(q->qidlestart);
|
||||
memcpy(q->Stab, RTA_DATA(tb[TCA_GRED_STAB-1]), 256);
|
||||
|
||||
if ( table->initd && table->grio) {
|
||||
/* this looks ugly but it's not in the fast path */
|
||||
for (i=0;i<table->DPs;i++) {
|
||||
if ((!table->tab[i]) || (i==q->DP) )
|
||||
continue;
|
||||
if (table->tab[i]->prio == q->prio ){
|
||||
/* WRED mode detected */
|
||||
table->eqp=1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!table->initd) {
|
||||
table->initd=1;
|
||||
/*
|
||||
the first entry also goes into the default until
|
||||
over-written
|
||||
*/
|
||||
|
||||
if (table->tab[table->def] == NULL) {
|
||||
table->tab[table->def]=
|
||||
kmalloc(sizeof(struct gred_sched_data), GFP_KERNEL);
|
||||
if (NULL == table->tab[table->def])
|
||||
return -ENOMEM;
|
||||
|
||||
memset(table->tab[table->def], 0,
|
||||
(sizeof(struct gred_sched_data)));
|
||||
}
|
||||
q= table->tab[table->def];
|
||||
q->DP=table->def;
|
||||
q->Wlog = ctl->Wlog;
|
||||
q->Plog = ctl->Plog;
|
||||
q->limit = ctl->limit;
|
||||
q->Scell_log = ctl->Scell_log;
|
||||
q->Rmask = ctl->Plog < 32 ? ((1<<ctl->Plog) - 1) : ~0UL;
|
||||
q->Scell_max = (255<<q->Scell_log);
|
||||
q->qth_min = ctl->qth_min<<ctl->Wlog;
|
||||
q->qth_max = ctl->qth_max<<ctl->Wlog;
|
||||
|
||||
if (table->grio)
|
||||
q->prio=table->tab[ctl->DP]->prio;
|
||||
else
|
||||
q->prio=8;
|
||||
|
||||
q->qcount = -1;
|
||||
PSCHED_SET_PASTPERFECT(q->qidlestart);
|
||||
memcpy(q->Stab, RTA_DATA(tb[TCA_GRED_STAB-1]), 256);
|
||||
}
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
static int gred_init(struct Qdisc *sch, struct rtattr *opt)
|
||||
{
|
||||
struct gred_sched *table = qdisc_priv(sch);
|
||||
struct tc_gred_sopt *sopt;
|
||||
struct rtattr *tb[TCA_GRED_STAB];
|
||||
struct rtattr *tb2[TCA_GRED_DPS];
|
||||
|
||||
if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_STAB, opt))
|
||||
return -EINVAL;
|
||||
|
||||
if (tb[TCA_GRED_PARMS-1] == 0 && tb[TCA_GRED_STAB-1] == 0) {
|
||||
rtattr_parse_nested(tb2, TCA_GRED_DPS, opt);
|
||||
|
||||
if (tb2[TCA_GRED_DPS-1] == 0)
|
||||
return -EINVAL;
|
||||
|
||||
sopt = RTA_DATA(tb2[TCA_GRED_DPS-1]);
|
||||
table->DPs=sopt->DPs;
|
||||
table->def=sopt->def_DP;
|
||||
table->grio=sopt->grio;
|
||||
table->initd=0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
DPRINTK("\n GRED_INIT error!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
|
||||
{
|
||||
unsigned long qave;
|
||||
struct rtattr *rta;
|
||||
struct tc_gred_qopt *opt = NULL ;
|
||||
struct tc_gred_qopt *dst;
|
||||
struct gred_sched *table = qdisc_priv(sch);
|
||||
struct gred_sched_data *q;
|
||||
int i;
|
||||
unsigned char *b = skb->tail;
|
||||
|
||||
rta = (struct rtattr*)b;
|
||||
RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
|
||||
|
||||
opt=kmalloc(sizeof(struct tc_gred_qopt)*MAX_DPs, GFP_KERNEL);
|
||||
|
||||
if (opt == NULL) {
|
||||
DPRINTK("gred_dump:failed to malloc for %Zd\n",
|
||||
sizeof(struct tc_gred_qopt)*MAX_DPs);
|
||||
goto rtattr_failure;
|
||||
}
|
||||
|
||||
memset(opt, 0, (sizeof(struct tc_gred_qopt))*table->DPs);
|
||||
|
||||
if (!table->initd) {
|
||||
DPRINTK("NO GRED Queues setup!\n");
|
||||
}
|
||||
|
||||
for (i=0;i<MAX_DPs;i++) {
|
||||
dst= &opt[i];
|
||||
q= table->tab[i];
|
||||
|
||||
if (!q) {
|
||||
/* hack -- fix at some point with proper message
|
||||
This is how we indicate to tc that there is no VQ
|
||||
at this DP */
|
||||
|
||||
dst->DP=MAX_DPs+i;
|
||||
continue;
|
||||
}
|
||||
|
||||
dst->limit=q->limit;
|
||||
dst->qth_min=q->qth_min>>q->Wlog;
|
||||
dst->qth_max=q->qth_max>>q->Wlog;
|
||||
dst->DP=q->DP;
|
||||
dst->backlog=q->backlog;
|
||||
if (q->qave) {
|
||||
if (table->eqp && table->grio) {
|
||||
q->qidlestart=table->tab[table->def]->qidlestart;
|
||||
q->qave=table->tab[table->def]->qave;
|
||||
}
|
||||
if (!PSCHED_IS_PASTPERFECT(q->qidlestart)) {
|
||||
long idle;
|
||||
psched_time_t now;
|
||||
PSCHED_GET_TIME(now);
|
||||
idle = PSCHED_TDIFF_SAFE(now, q->qidlestart, q->Scell_max);
|
||||
qave = q->qave >> q->Stab[(idle>>q->Scell_log)&0xFF];
|
||||
dst->qave = qave >> q->Wlog;
|
||||
|
||||
} else {
|
||||
dst->qave = q->qave >> q->Wlog;
|
||||
}
|
||||
} else {
|
||||
dst->qave = 0;
|
||||
}
|
||||
|
||||
|
||||
dst->Wlog = q->Wlog;
|
||||
dst->Plog = q->Plog;
|
||||
dst->Scell_log = q->Scell_log;
|
||||
dst->other = q->other;
|
||||
dst->forced = q->forced;
|
||||
dst->early = q->early;
|
||||
dst->pdrop = q->pdrop;
|
||||
dst->prio = q->prio;
|
||||
dst->packets=q->packetsin;
|
||||
dst->bytesin=q->bytesin;
|
||||
}
|
||||
|
||||
RTA_PUT(skb, TCA_GRED_PARMS, sizeof(struct tc_gred_qopt)*MAX_DPs, opt);
|
||||
rta->rta_len = skb->tail - b;
|
||||
|
||||
kfree(opt);
|
||||
return skb->len;
|
||||
|
||||
rtattr_failure:
|
||||
if (opt)
|
||||
kfree(opt);
|
||||
DPRINTK("gred_dump: FAILURE!!!!\n");
|
||||
|
||||
/* also free the opt struct here */
|
||||
skb_trim(skb, b - skb->data);
|
||||
return -1;
|
||||
}
|
||||
|
||||
static void gred_destroy(struct Qdisc *sch)
|
||||
{
|
||||
struct gred_sched *table = qdisc_priv(sch);
|
||||
int i;
|
||||
|
||||
for (i = 0;i < table->DPs; i++) {
|
||||
if (table->tab[i])
|
||||
kfree(table->tab[i]);
|
||||
}
|
||||
}
|
||||
|
||||
static struct Qdisc_ops gred_qdisc_ops = {
|
||||
.next = NULL,
|
||||
.cl_ops = NULL,
|
||||
.id = "gred",
|
||||
.priv_size = sizeof(struct gred_sched),
|
||||
.enqueue = gred_enqueue,
|
||||
.dequeue = gred_dequeue,
|
||||
.requeue = gred_requeue,
|
||||
.drop = gred_drop,
|
||||
.init = gred_init,
|
||||
.reset = gred_reset,
|
||||
.destroy = gred_destroy,
|
||||
.change = gred_change,
|
||||
.dump = gred_dump,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init gred_module_init(void)
|
||||
{
|
||||
return register_qdisc(&gred_qdisc_ops);
|
||||
}
|
||||
static void __exit gred_module_exit(void)
|
||||
{
|
||||
unregister_qdisc(&gred_qdisc_ops);
|
||||
}
|
||||
module_init(gred_module_init)
|
||||
module_exit(gred_module_exit)
|
||||
MODULE_LICENSE("GPL");
|
||||
Reference in New Issue
Block a user