static inline int gred_change_vq(struct Qdisc *sch, int dp,
struct tc_gred_qopt *ctl, int prio,
u8 *stab, u32 max_P,
struct gred_sched_data **prealloc)
{
struct gred_sched *table = qdisc_priv(sch);
struct gred_sched_data *q = table->tab[dp];
if (!q) {
table->tab[dp] = q = *prealloc;
*prealloc = NULL;
if (!q)
return -ENOMEM;
}
q->DP = dp;
q->prio = prio;
q->limit = ctl->limit;
if (q->backlog == 0)
red_end_of_idle_period(&q->vars);
red_set_parms(&q->parms,
ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
ctl->Scell_log, stab, max_P);
red_set_vars(&q->vars);
return 0;
}
static int red_change(struct Qdisc *sch, struct rtattr *opt)
{
struct red_sched_data *q = qdisc_priv(sch);
struct rtattr *tb[TCA_RED_MAX];
struct tc_red_qopt *ctl;
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) ||
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->limit = ctl->limit;
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))
red_end_of_idle_period(&q->parms);
sch_tree_unlock(sch);
return 0;
}
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;
if (table->tab[dp] == NULL) {
table->tab[dp] = kzalloc(sizeof(*q), GFP_KERNEL);
if (table->tab[dp] == NULL)
return -ENOMEM;
}
q = table->tab[dp];
q->DP = dp;
q->prio = prio;
q->limit = ctl->limit;
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 inline int gred_change_vq(struct Qdisc *sch, int dp,
struct tc_gred_qopt *ctl, int prio,
u8 *stab, u32 max_P,
struct gred_sched_data **prealloc,
struct netlink_ext_ack *extack)
{
struct gred_sched *table = qdisc_priv(sch);
struct gred_sched_data *q = table->tab[dp];
if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) {
NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters");
return -EINVAL;
}
if (!q) {
table->tab[dp] = q = *prealloc;
*prealloc = NULL;
if (!q)
return -ENOMEM;
q->red_flags = table->red_flags & GRED_VQ_RED_FLAGS;
}
q->DP = dp;
q->prio = prio;
if (ctl->limit > sch->limit)
q->limit = sch->limit;
else
q->limit = ctl->limit;
if (q->backlog == 0)
red_end_of_idle_period(&q->vars);
red_set_parms(&q->parms,
ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
ctl->Scell_log, stab, max_P);
red_set_vars(&q->vars);
return 0;
}
static int sfq_change(struct Qdisc *sch, struct nlattr *opt)
{
struct sfq_sched_data *q = qdisc_priv(sch);
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 (opt->nla_len >= nla_attr_size(sizeof(*ctl_v1)))
ctl_v1 = nla_data(opt);
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;
q->scaled_quantum = SFQ_ALLOT_SIZE(q->quantum);
}
q->perturb_period = ctl->perturb_period * HZ;
if (ctl->flows)
q->maxflows = min_t(u32, ctl->flows, SFQ_MAX_FLOWS);
if (ctl->divisor) {
q->divisor = ctl->divisor;
q->maxflows = min_t(u32, q->maxflows, q->divisor);
}
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->limit = min_t(u32, ctl->limit, q->maxdepth * q->maxflows);
q->maxflows = min_t(u32, q->maxflows, q->limit);
}
qlen = sch->q.qlen;
while (sch->q.qlen > q->limit)
sfq_drop(sch);
qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen);
del_timer(&q->perturb_timer);
if (q->perturb_period) {
mod_timer(&q->perturb_timer, jiffies + q->perturb_period);
q->perturbation = prandom_u32();
}
sch_tree_unlock(sch);
kfree(p);
return 0;
}
static int choke_change(struct Qdisc *sch, struct nlattr *opt)
{
struct choke_sched_data *q = qdisc_priv(sch);
struct nlattr *tb[TCA_CHOKE_MAX + 1];
const struct tc_red_qopt *ctl;
int err;
struct sk_buff **old = NULL;
unsigned int mask;
u32 max_P;
if (opt == NULL)
return -EINVAL;
err = nla_parse_nested(tb, TCA_CHOKE_MAX, opt, choke_policy);
if (err < 0)
return err;
if (tb[TCA_CHOKE_PARMS] == NULL ||
tb[TCA_CHOKE_STAB] == NULL)
return -EINVAL;
max_P = tb[TCA_CHOKE_MAX_P] ? nla_get_u32(tb[TCA_CHOKE_MAX_P]) : 0;
ctl = nla_data(tb[TCA_CHOKE_PARMS]);
if (ctl->limit > CHOKE_MAX_QUEUE)
return -EINVAL;
mask = roundup_pow_of_two(ctl->limit + 1) - 1;
if (mask != q->tab_mask) {
struct sk_buff **ntab;
ntab = kcalloc(mask + 1, sizeof(struct sk_buff *), GFP_KERNEL);
if (!ntab)
ntab = vzalloc((mask + 1) * sizeof(struct sk_buff *));
if (!ntab)
return -ENOMEM;
sch_tree_lock(sch);
old = q->tab;
if (old) {
unsigned int oqlen = sch->q.qlen, tail = 0;
while (q->head != q->tail) {
struct sk_buff *skb = q->tab[q->head];
q->head = (q->head + 1) & q->tab_mask;
if (!skb)
continue;
if (tail < mask) {
ntab[tail++] = skb;
continue;
}
sch->qstats.backlog -= qdisc_pkt_len(skb);
--sch->q.qlen;
qdisc_drop(skb, sch);
}
qdisc_tree_decrease_qlen(sch, oqlen - sch->q.qlen);
q->head = 0;
q->tail = tail;
}
q->tab_mask = mask;
q->tab = ntab;
} else
sch_tree_lock(sch);
q->flags = ctl->flags;
q->limit = ctl->limit;
red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
ctl->Plog, ctl->Scell_log,
nla_data(tb[TCA_CHOKE_STAB]),
max_P);
red_set_vars(&q->vars);
if (q->head == q->tail)
red_end_of_idle_period(&q->vars);
sch_tree_unlock(sch);
choke_free(old);
return 0;
}
