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net: sch: sch_drr: add extack support

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This patch adds extack support for the drr qdisc implementation by
adding NL_SET_ERR_MSG in validation of user input.
Also it serves to illustrate a use case of how the infrastructure ops
api changes are to be used by individual qdiscs.

Cc: David Ahern <dsahern@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Aring 2017-12-20 12:35:24 -05:00 committed by David S. Miller
parent 710fb39689
commit a7c31693e1
1 changed files with 14 additions and 5 deletions
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19
net/sched/sch_drr.c
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@ -74,17 +74,21 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
u32 quantum;
int err;
if (!opt)
if (!opt) {
NL_SET_ERR_MSG(extack, "DRR options are required for this operation");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_DRR_MAX, opt, drr_policy, NULL);
err = nla_parse_nested(tb, TCA_DRR_MAX, opt, drr_policy, extack);
if (err < 0)
return err;
if (tb[TCA_DRR_QUANTUM]) {
quantum = nla_get_u32(tb[TCA_DRR_QUANTUM]);
if (quantum == 0)
if (quantum == 0) {
NL_SET_ERR_MSG(extack, "Specified DRR quantum cannot be zero");
return -EINVAL;
}
} else
quantum = psched_mtu(qdisc_dev(sch));
@ -95,8 +99,10 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
NULL,
qdisc_root_sleeping_running(sch),
tca[TCA_RATE]);
if (err)
if (err) {
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
return err;
}
}
sch_tree_lock(sch);
@ -127,6 +133,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
qdisc_root_sleeping_running(sch),
tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
qdisc_destroy(cl->qdisc);
kfree(cl);
return err;
@ -179,8 +186,10 @@ static struct tcf_block *drr_tcf_block(struct Qdisc *sch, unsigned long cl,
{
struct drr_sched *q = qdisc_priv(sch);
if (cl)
if (cl) {
NL_SET_ERR_MSG(extack, "DRR classid must be zero");
return NULL;
}
return q->block;
}