Add extack messages to -EINVAL errors, to help users identify
their mistakes.
Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: John Hurley <john.hur...@netronome.com>
---
net/sched/sch_gred.c | 44 +++++++++++++++++++++++++++++++++-----------
1 file changed, 33 insertions(+), 11 deletions(-)
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 9f6a4ddd262a..3d7bd374b303 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -300,7 +300,8 @@ static inline void gred_destroy_vq(struct gred_sched_data
*q)
kfree(q);
}
-static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps)
+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;
@@ -311,9 +312,19 @@ static inline int gred_change_table_def(struct Qdisc *sch,
struct nlattr *dps)
sopt = nla_data(dps);
- if (sopt->DPs > MAX_DPs || sopt->DPs == 0 ||
- sopt->def_DP >= sopt->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;
+ }
sch_tree_lock(sch);
table->DPs = sopt->DPs;
@@ -352,13 +363,16 @@ static inline int gred_change_table_def(struct Qdisc
*sch, struct nlattr *dps)
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_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))
+ 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;
@@ -413,21 +427,25 @@ static int gred_change(struct Qdisc *sch, struct nlattr
*opt,
if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) {
if (tb[TCA_GRED_LIMIT] != NULL)
sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
- return gred_change_table_def(sch, tb[TCA_GRED_DPS]);
+ return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
}
if (tb[TCA_GRED_PARMS] == NULL ||
tb[TCA_GRED_STAB] == NULL ||
- tb[TCA_GRED_LIMIT] != NULL)
+ tb[TCA_GRED_LIMIT] != NULL) {
+ NL_SET_ERR_MSG_MOD(extack, "can't configure Qdisc and virtual
queue at the same time");
return -EINVAL;
+ }
max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0;
ctl = nla_data(tb[TCA_GRED_PARMS]);
stab = nla_data(tb[TCA_GRED_STAB]);
- if (ctl->DP >= table->DPs)
+ if (ctl->DP >= table->DPs) {
+ NL_SET_ERR_MSG_MOD(extack, "virtual queue index above virtual
queue count");
return -EINVAL;
+ }
if (gred_rio_mode(table)) {
if (ctl->prio == 0) {
@@ -447,7 +465,8 @@ static int gred_change(struct Qdisc *sch, struct nlattr
*opt,
prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
sch_tree_lock(sch);
- err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc);
+ err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc,
+ extack);
if (err < 0)
goto err_unlock_free;
@@ -480,8 +499,11 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt,
if (err < 0)
return err;
- if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB])
+ if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "virtual queue configuration can't be
specified at initialization time");
return -EINVAL;
+ }
if (tb[TCA_GRED_LIMIT])
sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
@@ -489,7 +511,7 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt,
sch->limit = qdisc_dev(sch)->tx_queue_len
* psched_mtu(qdisc_dev(sch));
- return gred_change_table_def(sch, tb[TCA_GRED_DPS]);
+ return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
}
static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
--
2.17.1
