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-rw-r--r--net/sched/sch_gred.c841
-rw-r--r--net/sched/sch_red.c418
2 files changed, 518 insertions, 741 deletions
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 25c171c3271..29a2dd9f302 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -15,247 +15,281 @@
* from Ren Liu
* - More error checks
*
- *
- *
- * For all the glorious comments look at Alexey's sch_red.c
+ * For all the glorious comments look at include/net/red.h
*/
#include <linux/config.h>
#include <linux/module.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/in.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/if_ether.h>
-#include <linux/inet.h>
#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/notifier.h>
-#include <net/ip.h>
-#include <net/route.h>
#include <linux/skbuff.h>
-#include <net/sock.h>
#include <net/pkt_sched.h>
+#include <net/red.h>
-#if 1 /* control */
-#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
-#else
-#define DPRINTK(format,args...)
-#endif
-
-#if 0 /* data */
-#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
-#else
-#define D2PRINTK(format,args...)
-#endif
+#define GRED_DEF_PRIO (MAX_DPs / 2)
+#define GRED_VQ_MASK (MAX_DPs - 1)
struct gred_sched_data;
struct gred_sched;
struct gred_sched_data
{
-/* Parameters */
u32 limit; /* HARD maximal queue length */
- u32 qth_min; /* Min average length threshold: A scaled */
- u32 qth_max; /* Max average length threshold: A scaled */
u32 DP; /* the drop pramaters */
- char Wlog; /* log(W) */
- char Plog; /* random number bits */
- u32 Scell_max;
- u32 Rmask;
u32 bytesin; /* bytes seen on virtualQ so far*/
u32 packetsin; /* packets seen on virtualQ so far*/
u32 backlog; /* bytes on the virtualQ */
- u32 forced; /* packets dropped for exceeding limits */
- u32 early; /* packets dropped as a warning */
- u32 other; /* packets dropped by invoking drop() */
- u32 pdrop; /* packets dropped because we exceeded physical queue limits */
- char Scell_log;
- u8 Stab[256];
- u8 prio; /* the prio of this vq */
-
-/* Variables */
- unsigned long qave; /* Average queue length: A scaled */
- int qcount; /* Packets since last random number generation */
- u32 qR; /* Cached random number */
-
- psched_time_t qidlestart; /* Start of idle period */
+ u8 prio; /* the prio of this vq */
+
+ struct red_parms parms;
+ struct red_stats stats;
+};
+
+enum {
+ GRED_WRED_MODE = 1,
+ GRED_RIO_MODE,
};
struct gred_sched
{
struct gred_sched_data *tab[MAX_DPs];
- u32 DPs;
- u32 def;
- u8 initd;
- u8 grio;
- u8 eqp;
+ unsigned long flags;
+ u32 red_flags;
+ u32 DPs;
+ u32 def;
+ struct red_parms wred_set;
};
-static int
-gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static inline int gred_wred_mode(struct gred_sched *table)
{
- psched_time_t now;
- struct gred_sched_data *q=NULL;
- struct gred_sched *t= qdisc_priv(sch);
- unsigned long qave=0;
- int i=0;
+ return test_bit(GRED_WRED_MODE, &table->flags);
+}
+
+static inline void gred_enable_wred_mode(struct gred_sched *table)
+{
+ __set_bit(GRED_WRED_MODE, &table->flags);
+}
+
+static inline void gred_disable_wred_mode(struct gred_sched *table)
+{
+ __clear_bit(GRED_WRED_MODE, &table->flags);
+}
+
+static inline int gred_rio_mode(struct gred_sched *table)
+{
+ return test_bit(GRED_RIO_MODE, &table->flags);
+}
+
+static inline void gred_enable_rio_mode(struct gred_sched *table)
+{
+ __set_bit(GRED_RIO_MODE, &table->flags);
+}
+
+static inline void gred_disable_rio_mode(struct gred_sched *table)
+{
+ __clear_bit(GRED_RIO_MODE, &table->flags);
+}
+
+static inline int gred_wred_mode_check(struct Qdisc *sch)
+{
+ struct gred_sched *table = qdisc_priv(sch);
+ int i;
- if (!t->initd && skb_queue_len(&sch->q) < (sch->dev->tx_queue_len ? : 1)) {
- D2PRINTK("NO GRED Queues setup yet! Enqueued anyway\n");
- goto do_enqueue;
+ /* Really ugly O(n^2) but shouldn't be necessary too frequent. */
+ for (i = 0; i < table->DPs; i++) {
+ struct gred_sched_data *q = table->tab[i];
+ int n;
+
+ if (q == NULL)
+ continue;
+
+ for (n = 0; n < table->DPs; n++)
+ if (table->tab[n] && table->tab[n] != q &&
+ table->tab[n]->prio == q->prio)
+ return 1;
}
+ return 0;
+}
+
+static inline unsigned int gred_backlog(struct gred_sched *table,
+ struct gred_sched_data *q,
+ struct Qdisc *sch)
+{
+ if (gred_wred_mode(table))
+ return sch->qstats.backlog;
+ else
+ return q->backlog;
+}
+
+static inline u16 tc_index_to_dp(struct sk_buff *skb)
+{
+ return skb->tc_index & GRED_VQ_MASK;
+}
+
+static inline void gred_load_wred_set(struct gred_sched *table,
+ struct gred_sched_data *q)
+{
+ q->parms.qavg = table->wred_set.qavg;
+ q->parms.qidlestart = table->wred_set.qidlestart;
+}
+
+static inline void gred_store_wred_set(struct gred_sched *table,
+ struct gred_sched_data *q)
+{
+ table->wred_set.qavg = q->parms.qavg;
+}
+
+static inline int gred_use_ecn(struct gred_sched *t)
+{
+ return t->red_flags & TC_RED_ECN;
+}
- if ( ((skb->tc_index&0xf) > (t->DPs -1)) || !(q=t->tab[skb->tc_index&0xf])) {
- printk("GRED: setting to default (%d)\n ",t->def);
- if (!(q=t->tab[t->def])) {
- DPRINTK("GRED: setting to default FAILED! dropping!! "
- "(%d)\n ", t->def);
- goto drop;
+static inline int gred_use_harddrop(struct gred_sched *t)
+{
+ return t->red_flags & TC_RED_HARDDROP;
+}
+
+static int gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+{
+ struct gred_sched_data *q=NULL;
+ struct gred_sched *t= qdisc_priv(sch);
+ unsigned long qavg = 0;
+ u16 dp = tc_index_to_dp(skb);
+
+ if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
+ dp = t->def;
+
+ if ((q = t->tab[dp]) == NULL) {
+ /* Pass through packets not assigned to a DP
+ * if no default DP has been configured. This
+ * allows for DP flows to be left untouched.
+ */
+ if (skb_queue_len(&sch->q) < sch->dev->tx_queue_len)
+ return qdisc_enqueue_tail(skb, sch);
+ else
+ goto drop;
}
+
/* fix tc_index? --could be controvesial but needed for
requeueing */
- skb->tc_index=(skb->tc_index&0xfffffff0) | t->def;
+ skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp;
}
- D2PRINTK("gred_enqueue virtualQ 0x%x classid %x backlog %d "
- "general backlog %d\n",skb->tc_index&0xf,sch->handle,q->backlog,
- sch->qstats.backlog);
- /* sum up all the qaves of prios <= to ours to get the new qave*/
- if (!t->eqp && t->grio) {
- for (i=0;i<t->DPs;i++) {
- if ((!t->tab[i]) || (i==q->DP))
- continue;
-
- if ((t->tab[i]->prio < q->prio) && (PSCHED_IS_PASTPERFECT(t->tab[i]->qidlestart)))
- qave +=t->tab[i]->qave;
+ /* sum up all the qaves of prios <= to ours to get the new qave */
+ if (!gred_wred_mode(t) && gred_rio_mode(t)) {
+ int i;
+
+ for (i = 0; i < t->DPs; i++) {
+ if (t->tab[i] && t->tab[i]->prio < q->prio &&
+ !red_is_idling(&t->tab[i]->parms))
+ qavg +=t->tab[i]->parms.qavg;
}
-
+
}
q->packetsin++;
- q->bytesin+=skb->len;
+ q->bytesin += skb->len;
- if (t->eqp && t->grio) {
- qave=0;
- q->qave=t->tab[t->def]->qave;
- q->qidlestart=t->tab[t->def]->qidlestart;
- }
+ if (gred_wred_mode(t))
+ gred_load_wred_set(t, q);
- if (!PSCHED_IS_PASTPERFECT(q->qidlestart)) {
- long us_idle;
- PSCHED_GET_TIME(now);
- us_idle = PSCHED_TDIFF_SAFE(now, q->qidlestart, q->Scell_max);
- PSCHED_SET_PASTPERFECT(q->qidlestart);
+ q->parms.qavg = red_calc_qavg(&q->parms, gred_backlog(t, q, sch));
- q->qave >>= q->Stab[(us_idle>>q->Scell_log)&0xFF];
- } else {
- if (t->eqp) {
- q->qave += sch->qstats.backlog - (q->qave >> q->Wlog);
- } else {
- q->qave += q->backlog - (q->qave >> q->Wlog);
- }
+ if (red_is_idling(&q->parms))
+ red_end_of_idle_period(&q->parms);
- }
-
-
- if (t->eqp && t->grio)
- t->tab[t->def]->qave=q->qave;
-
- if ((q->qave+qave) < q->qth_min) {
- q->qcount = -1;
-enqueue:
- if (q->backlog + skb->len <= q->limit) {
- q->backlog += skb->len;
-do_enqueue:
- __skb_queue_tail(&sch->q, skb);
- sch->qstats.backlog += skb->len;
- sch->bstats.bytes += skb->len;
- sch->bstats.packets++;
- return 0;
- } else {
- q->pdrop++;
- }
+ if (gred_wred_mode(t))
+ gred_store_wred_set(t, q);
-drop:
- kfree_skb(skb);
- sch->qstats.drops++;
- return NET_XMIT_DROP;
- }
- if ((q->qave+qave) >= q->qth_max) {
- q->qcount = -1;
- sch->qstats.overlimits++;
- q->forced++;
- goto drop;
+ switch (red_action(&q->parms, q->parms.qavg + qavg)) {
+ case RED_DONT_MARK:
+ break;
+
+ case RED_PROB_MARK:
+ sch->qstats.overlimits++;
+ if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) {
+ q->stats.prob_drop++;
+ goto congestion_drop;
+ }
+
+ q->stats.prob_mark++;
+ break;
+
+ case RED_HARD_MARK:
+ sch->qstats.overlimits++;
+ if (gred_use_harddrop(t) || !gred_use_ecn(t) ||
+ !INET_ECN_set_ce(skb)) {
+ q->stats.forced_drop++;
+ goto congestion_drop;
+ }
+ q->stats.forced_mark++;
+ break;
}
- if (++q->qcount) {
- if ((((qave+q->qave) - q->qth_min)>>q->Wlog)*q->qcount < q->qR)
- goto enqueue;
- q->qcount = 0;
- q->qR = net_random()&q->Rmask;
- sch->qstats.overlimits++;
- q->early++;
- goto drop;
+
+ if (q->backlog + skb->len <= q->limit) {
+ q->backlog += skb->len;
+ return qdisc_enqueue_tail(skb, sch);
}
- q->qR = net_random()&q->Rmask;
- goto enqueue;
+
+ q->stats.pdrop++;
+drop:
+ return qdisc_drop(skb, sch);
+
+congestion_drop:
+ qdisc_drop(skb, sch);
+ return NET_XMIT_CN;
}
-static int
-gred_requeue(struct sk_buff *skb, struct Qdisc* sch)
+static int gred_requeue(struct sk_buff *skb, struct Qdisc* sch)
{
+ struct gred_sched *t = qdisc_priv(sch);
struct gred_sched_data *q;
- struct gred_sched *t= qdisc_priv(sch);
- q= t->tab[(skb->tc_index&0xf)];
-/* error checking here -- probably unnecessary */
- PSCHED_SET_PASTPERFECT(q->qidlestart);
-
- __skb_queue_head(&sch->q, skb);
- sch->qstats.backlog += skb->len;
- sch->qstats.requeues++;
- q->backlog += skb->len;
- return 0;
+ u16 dp = tc_index_to_dp(skb);
+
+ if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "GRED: Unable to relocate VQ 0x%x "
+ "for requeue, screwing up backlog.\n",
+ tc_index_to_dp(skb));
+ } else {
+ if (red_is_idling(&q->parms))
+ red_end_of_idle_period(&q->parms);
+ q->backlog += skb->len;
+ }
+
+ return qdisc_requeue(skb, sch);
}
-static struct sk_buff *
-gred_dequeue(struct Qdisc* sch)
+static struct sk_buff *gred_dequeue(struct Qdisc* sch)
{
struct sk_buff *skb;
- struct gred_sched_data *q;
- struct gred_sched *t= qdisc_priv(sch);
+ struct gred_sched *t = qdisc_priv(sch);
+
+ skb = qdisc_dequeue_head(sch);
- skb = __skb_dequeue(&sch->q);
if (skb) {
- sch->qstats.backlog -= skb->len;
- q= t->tab[(skb->tc_index&0xf)];
- if (q) {
- q->backlog -= skb->len;
- if (!q->backlog && !t->eqp)
- PSCHED_GET_TIME(q->qidlestart);
+ struct gred_sched_data *q;
+ u16 dp = tc_index_to_dp(skb);
+
+ if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "GRED: Unable to relocate "
+ "VQ 0x%x after dequeue, screwing up "
+ "backlog.\n", tc_index_to_dp(skb));
} else {
- D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf);
+ q->backlog -= skb->len;
+
+ if (!q->backlog && !gred_wred_mode(t))
+ red_start_of_idle_period(&q->parms);
}
+
return skb;
}
- if (t->eqp) {
- q= t->tab[t->def];
- if (!q)
- D2PRINTK("no default VQ set: Results will be "
- "screwed up\n");
- else
- PSCHED_GET_TIME(q->qidlestart);
- }
+ if (gred_wred_mode(t) && !red_is_idling(&t->wred_set))
+ red_start_of_idle_period(&t->wred_set);
return NULL;
}
@@ -263,36 +297,34 @@ gred_dequeue(struct Qdisc* sch)
static unsigned int gred_drop(struct Qdisc* sch)
{
struct sk_buff *skb;
+ struct gred_sched *t = qdisc_priv(sch);
- struct gred_sched_data *q;
- struct gred_sched *t= qdisc_priv(sch);
-
- skb = __skb_dequeue_tail(&sch->q);
+ skb = qdisc_dequeue_tail(sch);
if (skb) {
unsigned int len = skb->len;
- sch->qstats.backlog -= len;
- sch->qstats.drops++;
- q= t->tab[(skb->tc_index&0xf)];
- if (q) {
- q->backlog -= len;
- q->other++;
- if (!q->backlog && !t->eqp)
- PSCHED_GET_TIME(q->qidlestart);
+ struct gred_sched_data *q;
+ u16 dp = tc_index_to_dp(skb);
+
+ if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "GRED: Unable to relocate "
+ "VQ 0x%x while dropping, screwing up "
+ "backlog.\n", tc_index_to_dp(skb));
} else {
- D2PRINTK("gred_dequeue: skb has bad tcindex %x\n",skb->tc_index&0xf);
+ q->backlog -= len;
+ q->stats.other++;
+
+ if (!q->backlog && !gred_wred_mode(t))
+ red_start_of_idle_period(&q->parms);
}
- kfree_skb(skb);
+ qdisc_drop(skb, sch);
return len;
}
- q=t->tab[t->def];
- if (!q) {
- D2PRINTK("no default VQ set: Results might be screwed up\n");
- return 0;
- }
+ if (gred_wred_mode(t) && !red_is_idling(&t->wred_set))
+ red_start_of_idle_period(&t->wred_set);
- PSCHED_GET_TIME(q->qidlestart);
return 0;
}
@@ -300,293 +332,241 @@ static unsigned int gred_drop(struct Qdisc* sch)
static void gred_reset(struct Qdisc* sch)
{
int i;
- struct gred_sched_data *q;
- struct gred_sched *t= qdisc_priv(sch);
+ struct gred_sched *t = qdisc_priv(sch);
+
+ qdisc_reset_queue(sch);
- __skb_queue_purge(&sch->q);
+ for (i = 0; i < t->DPs; i++) {
+ struct gred_sched_data *q = t->tab[i];
- sch->qstats.backlog = 0;
+ if (!q)
+ continue;
- for (i=0;i<t->DPs;i++) {
- q= t->tab[i];
- if (!q)
- continue;
- PSCHED_SET_PASTPERFECT(q->qidlestart);
- q->qave = 0;
- q->qcount = -1;
+ red_restart(&q->parms);
q->backlog = 0;
- q->other=0;
- q->forced=0;
- q->pdrop=0;
- q->early=0;
}
}
-static int gred_change(struct Qdisc *sch, struct rtattr *opt)
+static inline void gred_destroy_vq(struct gred_sched_data *q)
+{
+ kfree(q);
+}
+
+static inline int gred_change_table_def(struct Qdisc *sch, struct rtattr *dps)
{
struct gred_sched *table = qdisc_priv(sch);
- struct gred_sched_data *q;
- struct tc_gred_qopt *ctl;
struct tc_gred_sopt *sopt;
- struct rtattr *tb[TCA_GRED_STAB];
- struct rtattr *tb2[TCA_GRED_DPS];
int i;
- if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_STAB, opt))
+ if (dps == NULL || RTA_PAYLOAD(dps) < sizeof(*sopt))
return -EINVAL;
- if (tb[TCA_GRED_PARMS-1] == 0 && tb[TCA_GRED_STAB-1] == 0) {
- rtattr_parse_nested(tb2, TCA_GRED_DPS, opt);
+ sopt = RTA_DATA(dps);
+
+ if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs)
+ return -EINVAL;
- if (tb2[TCA_GRED_DPS-1] == 0)
- return -EINVAL;
+ sch_tree_lock(sch);
+ table->DPs = sopt->DPs;
+ table->def = sopt->def_DP;
+ table->red_flags = sopt->flags;
+
+ /*
+ * Every entry point to GRED is synchronized with the above code
+ * and the DP is checked against DPs, i.e. shadowed VQs can no
+ * longer be found so we can unlock right here.
+ */
+ sch_tree_unlock(sch);
+
+ if (sopt->grio) {
+ gred_enable_rio_mode(table);
+ gred_disable_wred_mode(table);
+ if (gred_wred_mode_check(sch))
+ gred_enable_wred_mode(table);
+ } else {
+ gred_disable_rio_mode(table);
+ gred_disable_wred_mode(table);
+ }
- sopt = RTA_DATA(tb2[TCA_GRED_DPS-1]);
- table->DPs=sopt->DPs;
- table->def=sopt->def_DP;
- table->grio=sopt->grio;
- table->initd=0;
- /* probably need to clear all the table DP entries as well */
- return 0;
- }
+ for (i = table->DPs; i < MAX_DPs; i++) {
+ if (table->tab[i]) {
+ printk(KERN_WARNING "GRED: Warning: Destroying "
+ "shadowed VQ 0x%x\n", i);
+ gred_destroy_vq(table->tab[i]);
+ table->tab[i] = NULL;
+ }
+ }
+ return 0;
+}
- if (!table->DPs || tb[TCA_GRED_PARMS-1] == 0 || tb[TCA_GRED_STAB-1] == 0 ||
- RTA_PAYLOAD(tb[TCA_GRED_PARMS-1]) < sizeof(*ctl) ||
- RTA_PAYLOAD(tb[TCA_GRED_STAB-1]) < 256)
- return -EINVAL;
+static inline int gred_change_vq(struct Qdisc *sch, int dp,
+ struct tc_gred_qopt *ctl, int prio, u8 *stab)
+{
+ struct gred_sched *table = qdisc_priv(sch);
+ struct gred_sched_data *q;
- ctl = RTA_DATA(tb[TCA_GRED_PARMS-1]);
- if (ctl->DP > MAX_DPs-1 ) {
- /* misbehaving is punished! Put in the default drop probability */
- DPRINTK("\nGRED: DP %u not in the proper range fixed. New DP "
- "set to default at %d\n",ctl->DP,table->def);
- 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])
+ if (table->tab[dp] == NULL) {
+ table->tab[dp] = kmalloc(sizeof(*q), GFP_KERNEL);
+ if (table->tab[dp] == NULL)
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;
+ memset(table->tab[dp], 0, sizeof(*q));
}
-
- q->DP=ctl->DP;
- q->Wlog = ctl->Wlog;
- q->Plog = ctl->Plog;
+ q = table->tab[dp];
+ q->DP = dp;
+ q->prio = prio;
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;
+ if (q->backlog == 0)
+ red_end_of_idle_period(&q->parms);
+ red_set_parms(&q->parms,
+ ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
+ ctl->Scell_log, stab);
+
+ return 0;
}
-static int gred_init(struct Qdisc *sch, struct rtattr *opt)
+static int gred_change(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];
+ struct tc_gred_qopt *ctl;
+ struct rtattr *tb[TCA_GRED_MAX];
+ int err = -EINVAL, prio = GRED_DEF_PRIO;
+ u8 *stab;
- if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_STAB, opt))
+ if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_MAX, 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 (tb[TCA_GRED_PARMS-1] == NULL && tb[TCA_GRED_STAB-1] == NULL)
+ return gred_change_table_def(sch, opt);
+
+ if (tb[TCA_GRED_PARMS-1] == NULL ||
+ RTA_PAYLOAD(tb[TCA_GRED_PARMS-1]) < sizeof(*ctl) ||
+ tb[TCA_GRED_STAB-1] == NULL ||
+ RTA_PAYLOAD(tb[TCA_GRED_STAB-1]) < 256)
+ return -EINVAL;
+
+ ctl = RTA_DATA(tb[TCA_GRED_PARMS-1]);
+ stab = RTA_DATA(tb[TCA_GRED_STAB-1]);
+
+ if (ctl->DP >= table->DPs)
+ goto errout;
- if (tb2[TCA_GRED_DPS-1] == 0)
- return -EINVAL;
+ if (gred_rio_mode(table)) {
+ if (ctl->prio == 0) {
+ int def_prio = GRED_DEF_PRIO;
- 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;
+ if (table->tab[table->def])
+ def_prio = table->tab[table->def]->prio;
+
+ printk(KERN_DEBUG "GRED: DP %u does not have a prio "
+ "setting default to %d\n", ctl->DP, def_prio);
+
+ prio = def_prio;
+ } else
+ prio = ctl->prio;
+ }
+
+ sch_tree_lock(sch);
+
+ err = gred_change_vq(sch, ctl->DP, ctl, prio, stab);
+ if (err < 0)
+ goto errout_locked;
+
+ if (gred_rio_mode(table)) {
+ gred_disable_wred_mode(table);
+ if (gred_wred_mode_check(sch))
+ gred_enable_wred_mode(table);
}
- DPRINTK("\n GRED_INIT error!\n");
- return -EINVAL;
+ err = 0;
+
+errout_locked:
+ sch_tree_unlock(sch);
+errout:
+ return err;
}
-static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
+static int gred_init(struct Qdisc *sch, struct rtattr *opt)
{
- 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;
+ struct rtattr *tb[TCA_GRED_MAX];
- rta = (struct rtattr*)b;
- RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+ if (opt == NULL || rtattr_parse_nested(tb, TCA_GRED_MAX, opt))
+ return -EINVAL;
- opt=kmalloc(sizeof(struct tc_gred_qopt)*MAX_DPs, GFP_KERNEL);
+ if (tb[TCA_GRED_PARMS-1] || tb[TCA_GRED_STAB-1])
+ return -EINVAL;
- if (opt == NULL) {
- DPRINTK("gred_dump:failed to malloc for %Zd\n",
- sizeof(struct tc_gred_qopt)*MAX_DPs);
- goto rtattr_failure;
- }
+ return gred_change_table_def(sch, tb[TCA_GRED_DPS-1]);
+}
- memset(opt, 0, (sizeof(struct tc_gred_qopt))*table->DPs);
+static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ struct gred_sched *table = qdisc_priv(sch);
+ struct rtattr *parms, *opts = NULL;
+ int i;
+ struct tc_gred_sopt sopt = {
+ .DPs = table->DPs,
+ .def_DP = table->def,
+ .grio = gred_rio_mode(table),
+ .flags = table->red_flags,
+ };
- if (!table->initd) {
- DPRINTK("NO GRED Queues setup!\n");
- }
+ opts = RTA_NEST(skb, TCA_OPTIONS);
+ RTA_PUT(skb, TCA_GRED_DPS, sizeof(sopt), &sopt);
+ parms = RTA_NEST(skb, TCA_GRED_PARMS);
+
+ for (i = 0; i < MAX_DPs; i++) {
+ struct gred_sched_data *q = table->tab[i];
+ struct tc_gred_qopt opt;
- for (i=0;i<MAX_DPs;i++) {
- dst= &opt[i];
- q= table->tab[i];
+ memset(&opt, 0, sizeof(opt));
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;
+ opt.DP = MAX_DPs + i;
+ goto append_opt;
}
- 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;
+ opt.limit = q->limit;
+ opt.DP = q->DP;
+ opt.backlog = q->backlog;
+ opt.prio = q->prio;
+ opt.qth_min = q->parms.qth_min >> q->parms.Wlog;
+ opt.qth_max = q->parms.qth_max >> q->parms.Wlog;
+ opt.Wlog = q->parms.Wlog;
+ opt.Plog = q->parms.Plog;
+ opt.Scell_log = q->parms.Scell_log;
+ opt.other = q->stats.other;
+ opt.early = q->stats.prob_drop;
+ opt.forced = q->stats.forced_drop;
+ opt.pdrop = q->stats.pdrop;
+ opt.packets = q->packetsin;
+ opt.bytesin = q->bytesin;
+
+ if (gred_wred_mode(table)) {
+ q->parms.qidlestart =
+ table->tab[table->def]->parms.qidlestart;
+ q->parms.qavg = table->tab[table->def]->parms.qavg;
}
-
-
- 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;
+
+ opt.qave = red_calc_qavg(&q->parms, q->parms.qavg);
+
+append_opt:
+ RTA_APPEND(skb, sizeof(opt), &opt);
}
- RTA_PUT(skb, TCA_GRED_PARMS, sizeof(struct tc_gred_qopt)*MAX_DPs, opt);
- rta->rta_len = skb->tail - b;
+ RTA_NEST_END(skb, parms);
- kfree(opt);
- return skb->len;
+ return RTA_NEST_END(skb, opts);
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;
+ return RTA_NEST_CANCEL(skb, opts);
}
static void gred_destroy(struct Qdisc *sch)
@@ -594,15 +574,13 @@ static void gred_destroy(struct Qdisc *sch)
struct gred_sched *table = qdisc_priv(sch);
int i;
- for (i = 0;i < table->DPs; i++) {
+ for (i = 0; i < table->DPs; i++) {
if (table->tab[i])
- kfree(table->tab[i]);
+ gred_destroy_vq(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,
@@ -621,10 +599,13 @@ static int __init gred_module_init(void)
{
return register_qdisc(&gred_qdisc_ops);
}
-static void __exit gred_module_exit(void)
+
+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");
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 7845d045eec..dccfa44c2d7 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -9,76 +9,23 @@
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Changes:
- * J Hadi Salim <hadi@nortel.com> 980914: computation fixes
+ * J Hadi Salim 980914: computation fixes
* Alexey Makarenko <makar@phoenix.kharkov.ua> 990814: qave on idle link was calculated incorrectly.
- * J Hadi Salim <hadi@nortelnetworks.com> 980816: ECN support
+ * J Hadi Salim 980816: ECN support
*/
#include <linux/config.h>
#include <linux/module.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/in.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/if_ether.h>
-#include <linux/inet.h>
#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/notifier.h>
-#include <net/ip.h>
-#include <net/route.h>
#include <linux/skbuff.h>
-#include <net/sock.h>
#include <net/pkt_sched.h>
#include <net/inet_ecn.h>
-#include <net/dsfield.h>
+#include <net/red.h>
-/* Random Early Detection (RED) algorithm.
- =======================================
-
- Source: Sally Floyd and Van Jacobson, "Random Early Detection Gateways
- for Congestion Avoidance", 1993, IEEE/ACM Transactions on Networking.
-
- This file codes a "divisionless" version of RED algorithm
- as written down in Fig.17 of the paper.
-
-Short description.
-------------------
-
- When a new packet arrives we calculate the average queue length:
-
- avg = (1-W)*avg + W*current_queue_len,
-
- W is the filter time constant (chosen as 2^(-Wlog)), it controls
- the inertia of the algorithm. To allow larger bursts, W should be
- decreased.
-
- if (avg > th_max) -> packet marked (dropped).
- if (avg < th_min) -> packet passes.
- if (th_min < avg < th_max) we calculate probability:
-
- Pb = max_P * (avg - th_min)/(th_max-th_min)
-
- and mark (drop) packet with this probability.
- Pb changes from 0 (at avg==th_min) to max_P (avg==th_max).
- max_P should be small (not 1), usually 0.01..0.02 is good value.
-
- max_P is chosen as a number, so that max_P/(th_max-th_min)
- is a negative power of two in order arithmetics to contain
- only shifts.
-
-
- Parameters, settable by user:
+/* Parameters, settable by user:
-----------------------------
limit - bytes (must be > qth_max + burst)
@@ -89,243 +36,93 @@ Short description.
arbitrarily high (well, less than ram size)
Really, this limit will never be reached
if RED works correctly.
-
- qth_min - bytes (should be < qth_max/2)
- qth_max - bytes (should be at least 2*qth_min and less limit)
- Wlog - bits (<32) log(1/W).
- Plog - bits (<32)
-
- Plog is related to max_P by formula:
-
- max_P = (qth_max-qth_min)/2^Plog;
-
- F.e. if qth_max=128K and qth_min=32K, then Plog=22
- corresponds to max_P=0.02
-
- Scell_log
- Stab
-
- Lookup table for log((1-W)^(t/t_ave).
-
-
-NOTES:
-
-Upper bound on W.
------------------
-
- If you want to allow bursts of L packets of size S,
- you should choose W:
-
- L + 1 - th_min/S < (1-(1-W)^L)/W
-
- th_min/S = 32 th_min/S = 4
-
- log(W) L
- -1 33
- -2 35
- -3 39
- -4 46
- -5 57
- -6 75
- -7 101
- -8 135
- -9 190
- etc.
*/
struct red_sched_data
{
-/* Parameters */
- u32 limit; /* HARD maximal queue length */
- u32 qth_min; /* Min average length threshold: A scaled */
- u32 qth_max; /* Max average length threshold: A scaled */
- u32 Rmask;
- u32 Scell_max;
- unsigned char flags;
- char Wlog; /* log(W) */
- char Plog; /* random number bits */
- char Scell_log;
- u8 Stab[256];
-
-/* Variables */
- unsigned long qave; /* Average queue length: A scaled */
- int qcount; /* Packets since last random number generation */
- u32 qR; /* Cached random number */
-
- psched_time_t qidlestart; /* Start of idle period */
- struct tc_red_xstats st;
+ u32 limit; /* HARD maximal queue length */
+ unsigned char flags;
+ struct red_parms parms;
+ struct red_stats stats;
};
-static int red_ecn_mark(struct sk_buff *skb)
+static inline int red_use_ecn(struct red_sched_data *q)
{
- if (skb->nh.raw + 20 > skb->tail)
- return 0;
-
- switch (skb->protocol) {
- case __constant_htons(ETH_P_IP):
- if (INET_ECN_is_not_ect(skb->nh.iph->tos))
- return 0;
- IP_ECN_set_ce(skb->nh.iph);
- return 1;
- case __constant_htons(ETH_P_IPV6):
- if (INET_ECN_is_not_ect(ipv6_get_dsfield(skb->nh.ipv6h)))
- return 0;
- IP6_ECN_set_ce(skb->nh.ipv6h);
- return 1;
- default:
- return 0;
- }
+ return q->flags & TC_RED_ECN;
}
-static int
-red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static inline int red_use_harddrop(struct red_sched_data *q)
+{
+ return q->flags & TC_RED_HARDDROP;
+}
+
+static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
- psched_time_t now;
+ q->parms.qavg = red_calc_qavg(&q->parms, sch->qstats.backlog);
- if (!PSCHED_IS_PASTPERFECT(q->qidlestart)) {
- long us_idle;
- int shift;
+ if (red_is_idling(&q->parms))
+ red_end_of_idle_period(&q->parms);
- PSCHED_GET_TIME(now);
- us_idle = PSCHED_TDIFF_SAFE(now, q->qidlestart, q->Scell_max);
- PSCHED_SET_PASTPERFECT(q->qidlestart);
+ switch (red_action(&q->parms, q->parms.qavg)) {
+ case RED_DONT_MARK:
+ break;
-/*
- The problem: ideally, average length queue recalcultion should
- be done over constant clock intervals. This is too expensive, so that
- the calculation is driven by outgoing packets.
- When the queue is idle we have to model this clock by hand.
-
- SF+VJ proposed to "generate" m = idletime/(average_pkt_size/bandwidth)
- dummy packets as a burst after idle time, i.e.
-
- q->qave *= (1-W)^m
-
- This is an apparently overcomplicated solution (f.e. we have to precompute
- a table to make this calculation in reasonable time)
- I believe that a simpler model may be used here,
- but it is field for experiments.
-*/
- shift = q->Stab[us_idle>>q->Scell_log];
-
- if (shift) {
- q->qave >>= shift;
- } else {
- /* Approximate initial part of exponent
- with linear function:
- (1-W)^m ~= 1-mW + ...
-
- Seems, it is the best solution to
- problem of too coarce exponent tabulation.
- */
-
- us_idle = (q->qave * us_idle)>>q->Scell_log;
- if (us_idle < q->qave/2)
- q->qave -= us_idle;
- else
- q->qave >>= 1;
- }
- } else {
- q->qave += sch->qstats.backlog - (q->qave >> q->Wlog);
- /* NOTE:
- q->qave is fixed point number with point at Wlog.
- The formulae above is equvalent to floating point
- version:
-
- qave = qave*(1-W) + sch->qstats.backlog*W;
- --ANK (980924)
- */
- }
+ case RED_PROB_MARK:
+ sch->qstats.overlimits++;
+ if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
+ q->stats.prob_drop++;
+ goto congestion_drop;
+ }
- if (q->qave < q->qth_min) {
- q->qcount = -1;
-enqueue:
- if (sch->qstats.backlog + skb->len <= q->limit) {
- __skb_queue_tail(&sch->q, skb);
- sch->qstats.backlog += skb->len;
- sch->bstats.bytes += skb->len;
- sch->bstats.packets++;
- return NET_XMIT_SUCCESS;
- } else {
- q->st.pdrop++;
- }
- kfree_skb(skb);
- sch->qstats.drops++;
- return NET_XMIT_DROP;
- }
- if (q->qave >= q->qth_max) {
- q->qcount = -1;
- sch->qstats.overlimits++;
-mark:
- if (!(q->flags&TC_RED_ECN) || !red_ecn_mark(skb)) {
- q->st.early++;
- goto drop;
- }
- q->st.marked++;
- goto enqueue;
- }
+ q->stats.prob_mark++;
+ break;
+
+ case RED_HARD_MARK:
+ sch->qstats.overlimits++;
+ if (red_use_harddrop(q) || !red_use_ecn(q) ||
+ !INET_ECN_set_ce(skb)) {
+ q->stats.forced_drop++;
+ goto congestion_drop;
+ }
- if (++q->qcount) {
- /* The formula used below causes questions.
-
- OK. qR is random number in the interval 0..Rmask
- i.e. 0..(2^Plog). If we used floating point
- arithmetics, it would be: (2^Plog)*rnd_num,
- where rnd_num is less 1.
-
- Taking into account, that qave have fixed
- point at Wlog, and Plog is related to max_P by
- max_P = (qth_max-qth_min)/2^Plog; two lines
- below have the following floating point equivalent:
-
- max_P*(qave - qth_min)/(qth_max-qth_min) < rnd/qcount
-
- Any questions? --ANK (980924)
- */
- if (((q->qave - q->qth_min)>>q->Wlog)*q->qcount < q->qR)
- goto enqueue;
- q->qcount = 0;
- q->qR = net_random()&q->Rmask;
- sch->qstats.overlimits++;
- goto mark;
+ q->stats.forced_mark++;
+ break;
}
- q->qR = net_random()&q->Rmask;
- goto enqueue;
-drop:
- kfree_skb(skb);
- sch->qstats.drops++;
+ if (sch->qstats.backlog + skb->len <= q->limit)
+ return qdisc_enqueue_tail(skb, sch);
+
+ q->stats.pdrop++;
+ return qdisc_drop(skb, sch);
+
+congestion_drop:
+ qdisc_drop(skb, sch);
return NET_XMIT_CN;
}
-static int
-red_requeue(struct sk_buff *skb, struct Qdisc* sch)
+static int red_requeue(struct sk_buff *skb, struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
- PSCHED_SET_PASTPERFECT(q->qidlestart);
+ if (red_is_idling(&q->parms))
+ red_end_of_idle_period(&q->parms);
- __skb_queue_head(&sch->q, skb);
- sch->qstats.backlog += skb->len;
- sch->qstats.requeues++;
- return 0;
+ return qdisc_requeue(skb, sch);
}
-static struct sk_buff *
-red_dequeue(struct Qdisc* sch)
+static struct sk_buff * red_dequeue(struct Qdisc* sch)
{
struct sk_buff *skb;
struct red_sched_data *q = qdisc_priv(sch);
- skb = __skb_dequeue(&sch->q);
- if (skb) {
- sch->qstats.backlog -= skb->len;
- return skb;
- }
- PSCHED_GET_TIME(q->qidlestart);
- return NULL;
+ skb = qdisc_dequeue_head(sch);
+
+ if (skb == NULL && !red_is_idling(&q->parms))
+ red_start_of_idle_period(&q->parms);
+
+ return skb;
}
static unsigned int red_drop(struct Qdisc* sch)
@@ -333,16 +130,17 @@ static unsigned int red_drop(struct Qdisc* sch)
struct sk_buff *skb;
struct red_sched_data *q = qdisc_priv(sch);
- skb = __skb_dequeue_tail(&sch->q);
+ skb = qdisc_dequeue_tail(sch);
if (skb) {
unsigned int len = skb->len;
- sch->qstats.backlog -= len;
- sch->qstats.drops++;
- q->st.other++;
- kfree_skb(skb);
+ q->stats.other++;
+ qdisc_drop(skb, sch);
return len;
}
- PSCHED_GET_TIME(q->qidlestart);
+
+ if (!red_is_idling(&q->parms))
+ red_start_of_idle_period(&q->parms);
+
return 0;
}
@@ -350,43 +148,38 @@ static void red_reset(struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
- __skb_queue_purge(&sch->q);
- sch->qstats.backlog = 0;
- PSCHED_SET_PASTPERFECT(q->qidlestart);
- q->qave = 0;
- q->qcount = -1;
+ qdisc_reset_queue(sch);
+ red_restart(&q->parms);
}
static int red_change(struct Qdisc *sch, struct rtattr *opt)
{
struct red_sched_data *q = qdisc_priv(sch);
- struct rtattr *tb[TCA_RED_STAB];
+ struct rtattr *tb[TCA_RED_MAX];
struct tc_red_qopt *ctl;
- if (opt == NULL ||
- rtattr_parse_nested(tb, TCA_RED_STAB, opt) ||
- tb[TCA_RED_PARMS-1] == 0 || tb[TCA_RED_STAB-1] == 0 ||
+ if (opt == NULL || rtattr_parse_nested(tb, TCA_RED_MAX, opt))
+ return -EINVAL;
+
+ if (tb[TCA_RED_PARMS-1] == NULL ||
RTA_PAYLOAD(tb[TCA_RED_PARMS-1]) < sizeof(*ctl) ||
- RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < 256)
+ tb[TCA_RED_STAB-1] == NULL ||
+ RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < RED_STAB_SIZE)
return -EINVAL;
ctl = RTA_DATA(tb[TCA_RED_PARMS-1]);
sch_tree_lock(sch);
q->flags = ctl->flags;
- q->Wlog = ctl->Wlog;
- q->Plog = ctl->Plog;
- q->Rmask = ctl->Plog < 32 ? ((1<<ctl->Plog) - 1) : ~0UL;
- q->Scell_log = ctl->Scell_log;
- q->Scell_max = (255<<q->Scell_log);
- q->qth_min = ctl->qth_min<<ctl->Wlog;
- q->qth_max = ctl->qth_max<<ctl->Wlog;
q->limit = ctl->limit;
- memcpy(q->Stab, RTA_DATA(tb[TCA_RED_STAB-1]), 256);
- q->qcount = -1;
+ red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
+ ctl->Plog, ctl->Scell_log,
+ RTA_DATA(tb[TCA_RED_STAB-1]));
+
if (skb_queue_empty(&sch->q))
- PSCHED_SET_PASTPERFECT(q->qidlestart);
+ red_end_of_idle_period(&q->parms);
+
sch_tree_unlock(sch);
return 0;
}
@@ -399,39 +192,39 @@ static int red_init(struct Qdisc* sch, struct rtattr *opt)
static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct red_sched_data *q = qdisc_priv(sch);
- unsigned char *b = skb->tail;
- struct rtattr *rta;
- struct tc_red_qopt opt;
-
- rta = (struct rtattr*)b;
- RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
- opt.limit = q->limit;
- opt.qth_min = q->qth_min>>q->Wlog;
- opt.qth_max = q->qth_max>>q->Wlog;
- opt.Wlog = q->Wlog;
- opt.Plog = q->Plog;
- opt.Scell_log = q->Scell_log;
- opt.flags = q->flags;
+ struct rtattr *opts = NULL;
+ struct tc_red_qopt opt = {
+ .limit = q->limit,
+ .flags = q->flags,
+ .qth_min = q->parms.qth_min >> q->parms.Wlog,
+ .qth_max = q->parms.qth_max >> q->parms.Wlog,
+ .Wlog = q->parms.Wlog,
+ .Plog = q->parms.Plog,
+ .Scell_log = q->parms.Scell_log,
+ };
+
+ opts = RTA_NEST(skb, TCA_OPTIONS);
RTA_PUT(skb, TCA_RED_PARMS, sizeof(opt), &opt);
- rta->rta_len = skb->tail - b;
-
- return skb->len;
+ return RTA_NEST_END(skb, opts);
rtattr_failure:
- skb_trim(skb, b - skb->data);
- return -1;
+ return RTA_NEST_CANCEL(skb, opts);
}
static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
{
struct red_sched_data *q = qdisc_priv(sch);
-
- return gnet_stats_copy_app(d, &q->st, sizeof(q->st));
+ struct tc_red_xstats st = {
+ .early = q->stats.prob_drop + q->stats.forced_drop,
+ .pdrop = q->stats.pdrop,
+ .other = q->stats.other,
+ .marked = q->stats.prob_mark + q->stats.forced_mark,
+ };
+
+ return gnet_stats_copy_app(d, &st, sizeof(st));
}
static struct Qdisc_ops red_qdisc_ops = {
- .next = NULL,
- .cl_ops = NULL,
.id = "red",
.priv_size = sizeof(struct red_sched_data),
.enqueue = red_enqueue,
@@ -450,10 +243,13 @@ static int __init red_module_init(void)
{
return register_qdisc(&red_qdisc_ops);
}
-static void __exit red_module_exit(void)
+
+static void __exit red_module_exit(void)
{
unregister_qdisc(&red_qdisc_ops);
}
+
module_init(red_module_init)
module_exit(red_module_exit)
+
MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-27 21:23:43 +0000