#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/flow_keys.h>
+#include <net/red.h>
/* Stochastic Fairness Queuing algorithm.
struct sfq_head dep; /* anchor in dep[] chains */
unsigned short hash; /* hash value (index in ht[]) */
short allot; /* credit for this slot */
+
+ unsigned int backlog;
+ struct red_vars vars;
};
struct sfq_sched_data {
/* frequently used fields */
int limit; /* limit of total number of packets in this qdisc */
unsigned int divisor; /* number of slots in hash table */
- unsigned int maxflows; /* number of flows in flows array */
- int headdrop;
- int maxdepth; /* limit of packets per flow */
+ u8 headdrop;
+ u8 maxdepth; /* limit of packets per flow */
u32 perturbation;
- struct tcf_proto *filter_list;
- sfq_index cur_depth; /* depth of longest slot */
+ u8 cur_depth; /* depth of longest slot */
+ u8 flags;
unsigned short scaled_quantum; /* SFQ_ALLOT_SIZE(quantum) */
- struct sfq_slot *tail; /* current slot in round */
+ struct tcf_proto *filter_list;
sfq_index *ht; /* Hash table ('divisor' slots) */
struct sfq_slot *slots; /* Flows table ('maxflows' entries) */
+ struct red_parms *red_parms;
+ struct tc_sfqred_stats stats;
+ struct sfq_slot *tail; /* current slot in round */
+
struct sfq_head dep[SFQ_MAX_DEPTH + 1];
/* Linked lists of slots, indexed by depth
* dep[0] : list of unused flows
* dep[X] : list of flows with X packets
*/
+ unsigned int maxflows; /* number of flows in flows array */
int perturb_period;
unsigned int quantum; /* Allotment per round: MUST BE >= MTU */
struct timer_list perturb_timer;
drop:
skb = q->headdrop ? slot_dequeue_head(slot) : slot_dequeue_tail(slot);
len = qdisc_pkt_len(skb);
+ slot->backlog -= len;
sfq_dec(q, x);
kfree_skb(skb);
sch->q.qlen--;
return 0;
}
+/* Is ECN parameter configured */
+static int sfq_prob_mark(const struct sfq_sched_data *q)
+{
+ return q->flags & TC_RED_ECN;
+}
+
+/* Should packets over max threshold just be marked */
+static int sfq_hard_mark(const struct sfq_sched_data *q)
+{
+ return (q->flags & (TC_RED_ECN | TC_RED_HARDDROP)) == TC_RED_ECN;
+}
+
+static int sfq_headdrop(const struct sfq_sched_data *q)
+{
+ return q->headdrop;
+}
+
static int
sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
sfq_index x, qlen;
struct sfq_slot *slot;
int uninitialized_var(ret);
+ struct sk_buff *head;
+ int delta;
hash = sfq_classify(skb, sch, &ret);
if (hash == 0) {
q->ht[hash] = x;
slot = &q->slots[x];
slot->hash = hash;
+ slot->backlog = 0; /* should already be 0 anyway... */
+ red_set_vars(&slot->vars);
+ goto enqueue;
}
+ if (q->red_parms) {
+ slot->vars.qavg = red_calc_qavg_no_idle_time(q->red_parms,
+ &slot->vars,
+ slot->backlog);
+ switch (red_action(q->red_parms,
+ &slot->vars,
+ slot->vars.qavg)) {
+ case RED_DONT_MARK:
+ break;
- if (slot->qlen >= q->maxdepth) {
- struct sk_buff *head;
+ case RED_PROB_MARK:
+ sch->qstats.overlimits++;
+ if (sfq_prob_mark(q)) {
+ /* We know we have at least one packet in queue */
+ if (sfq_headdrop(q) &&
+ INET_ECN_set_ce(slot->skblist_next)) {
+ q->stats.prob_mark_head++;
+ break;
+ }
+ if (INET_ECN_set_ce(skb)) {
+ q->stats.prob_mark++;
+ break;
+ }
+ }
+ q->stats.prob_drop++;
+ goto congestion_drop;
+
+ case RED_HARD_MARK:
+ sch->qstats.overlimits++;
+ if (sfq_hard_mark(q)) {
+ /* We know we have at least one packet in queue */
+ if (sfq_headdrop(q) &&
+ INET_ECN_set_ce(slot->skblist_next)) {
+ q->stats.forced_mark_head++;
+ break;
+ }
+ if (INET_ECN_set_ce(skb)) {
+ q->stats.forced_mark++;
+ break;
+ }
+ }
+ q->stats.forced_drop++;
+ goto congestion_drop;
+ }
+ }
- if (!q->headdrop)
+ if (slot->qlen >= q->maxdepth) {
+congestion_drop:
+ if (!sfq_headdrop(q))
return qdisc_drop(skb, sch);
+ /* We know we have at least one packet in queue */
head = slot_dequeue_head(slot);
- sch->qstats.backlog -= qdisc_pkt_len(head);
+ delta = qdisc_pkt_len(head) - qdisc_pkt_len(skb);
+ sch->qstats.backlog -= delta;
+ slot->backlog -= delta;
qdisc_drop(head, sch);
- sch->qstats.backlog += qdisc_pkt_len(skb);
slot_queue_add(slot, skb);
return NET_XMIT_CN;
}
+enqueue:
sch->qstats.backlog += qdisc_pkt_len(skb);
+ slot->backlog += qdisc_pkt_len(skb);
slot_queue_add(slot, skb);
sfq_inc(q, x);
if (slot->qlen == 1) { /* The flow is new */
slot->next = q->tail->next;
q->tail->next = x;
}
+ /* We could use a bigger initial quantum for new flows */
slot->allot = q->scaled_quantum;
}
if (++sch->q.qlen <= q->limit)
qdisc_bstats_update(sch, skb);
sch->q.qlen--;
sch->qstats.backlog -= qdisc_pkt_len(skb);
-
+ slot->backlog -= qdisc_pkt_len(skb);
/* Is the slot empty? */
if (slot->qlen == 0) {
q->ht[slot->hash] = SFQ_EMPTY_SLOT;
sfq_dec(q, i);
__skb_queue_tail(&list, skb);
}
+ slot->backlog = 0;
+ red_set_vars(&slot->vars);
q->ht[slot->hash] = SFQ_EMPTY_SLOT;
}
q->tail = NULL;
if (slot->qlen >= q->maxdepth)
goto drop;
slot_queue_add(slot, skb);
+ if (q->red_parms)
+ slot->vars.qavg = red_calc_qavg(q->red_parms,
+ &slot->vars,
+ slot->backlog);
+ slot->backlog += qdisc_pkt_len(skb);
sfq_inc(q, x);
if (slot->qlen == 1) { /* The flow is new */
if (q->tail == NULL) { /* It is the first flow */
struct tc_sfq_qopt *ctl = nla_data(opt);
struct tc_sfq_qopt_v1 *ctl_v1 = NULL;
unsigned int qlen;
+ struct red_parms *p = NULL;
if (opt->nla_len < nla_attr_size(sizeof(*ctl)))
return -EINVAL;
if (ctl->divisor &&
(!is_power_of_2(ctl->divisor) || ctl->divisor > 65536))
return -EINVAL;
-
+ if (ctl_v1 && ctl_v1->qth_min) {
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ }
sch_tree_lock(sch);
if (ctl->quantum) {
q->quantum = ctl->quantum;
if (ctl_v1) {
if (ctl_v1->depth)
q->maxdepth = min_t(u32, ctl_v1->depth, SFQ_MAX_DEPTH);
+ if (p) {
+ swap(q->red_parms, p);
+ red_set_parms(q->red_parms,
+ ctl_v1->qth_min, ctl_v1->qth_max,
+ ctl_v1->Wlog,
+ ctl_v1->Plog, ctl_v1->Scell_log,
+ NULL,
+ ctl_v1->max_P);
+ }
+ q->flags = ctl_v1->flags;
q->headdrop = ctl_v1->headdrop;
}
if (ctl->limit) {
q->perturbation = net_random();
}
sch_tree_unlock(sch);
+ kfree(p);
return 0;
}
del_timer_sync(&q->perturb_timer);
sfq_free(q->ht);
sfq_free(q->slots);
+ kfree(q->red_parms);
}
static int sfq_init(struct Qdisc *sch, struct nlattr *opt)
struct sfq_sched_data *q = qdisc_priv(sch);
unsigned char *b = skb_tail_pointer(skb);
struct tc_sfq_qopt_v1 opt;
+ struct red_parms *p = q->red_parms;
memset(&opt, 0, sizeof(opt));
opt.v0.quantum = q->quantum;
opt.depth = q->maxdepth;
opt.headdrop = q->headdrop;
+ if (p) {
+ opt.qth_min = p->qth_min >> p->Wlog;
+ opt.qth_max = p->qth_max >> p->Wlog;
+ opt.Wlog = p->Wlog;
+ opt.Plog = p->Plog;
+ opt.Scell_log = p->Scell_log;
+ opt.max_P = p->max_P;
+ }
+ memcpy(&opt.stats, &q->stats, sizeof(opt.stats));
+ opt.flags = q->flags;
+
NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
return skb->len;
sfq_index idx = q->ht[cl - 1];
struct gnet_stats_queue qs = { 0 };
struct tc_sfq_xstats xstats = { 0 };
- struct sk_buff *skb;
if (idx != SFQ_EMPTY_SLOT) {
const struct sfq_slot *slot = &q->slots[idx];
xstats.allot = slot->allot << SFQ_ALLOT_SHIFT;
qs.qlen = slot->qlen;
- slot_queue_walk(slot, skb)
- qs.backlog += qdisc_pkt_len(skb);
+ qs.backlog = slot->backlog;
}
if (gnet_stats_copy_queue(d, &qs) < 0)
return -1;
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