static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps)
{
struct gred_sched *table = qdisc_priv(sch);
struct tc_gred_sopt *sopt;
int i;
if (dps == NULL)
return -EINVAL;
sopt = nla_data(dps);
if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs)
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);
}
for (i = table->DPs; i < MAX_DPs; i++) {
if (table->tab[i]) {
pr_warning("GRED: Warning: Destroying "
"shadowed VQ 0x%x\n", i);
gred_destroy_vq(table->tab[i]);
table->tab[i] = NULL;
}
}
return 0;
}
static int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps,
struct netlink_ext_ack *extack)
{
struct gred_sched *table = qdisc_priv(sch);
struct tc_gred_sopt *sopt;
bool red_flags_changed;
int i;
if (!dps)
return -EINVAL;
sopt = nla_data(dps);
if (sopt->DPs > MAX_DPs) {
NL_SET_ERR_MSG_MOD(extack, "number of virtual queues too high");
return -EINVAL;
}
if (sopt->DPs == 0) {
NL_SET_ERR_MSG_MOD(extack,
"number of virtual queues can't be 0");
return -EINVAL;
}
if (sopt->def_DP >= sopt->DPs) {
NL_SET_ERR_MSG_MOD(extack, "default virtual queue above virtual queue count");
return -EINVAL;
}
if (sopt->flags && gred_per_vq_red_flags_used(table)) {
NL_SET_ERR_MSG_MOD(extack, "can't set per-Qdisc RED flags when per-virtual queue flags are used");
return -EINVAL;
}
sch_tree_lock(sch);
table->DPs = sopt->DPs;
table->def = sopt->def_DP;
red_flags_changed = table->red_flags != sopt->flags;
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);
}
if (red_flags_changed)
for (i = 0; i < table->DPs; i++)
if (table->tab[i])
table->tab[i]->red_flags =
table->red_flags & GRED_VQ_RED_FLAGS;
for (i = table->DPs; i < MAX_DPs; i++) {
if (table->tab[i]) {
pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n",
i);
gred_destroy_vq(table->tab[i]);
table->tab[i] = NULL;
}
}
gred_offload(sch, TC_GRED_REPLACE);
return 0;
}
