From a7c31693e1054fe9af08bc404cdd687c327d0fa6 Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Wed, 20 Dec 2017 12:35:24 -0500 Subject: [PATCH] net: sch: sch_drr: add extack support 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 Acked-by: Jamal Hadi Salim Signed-off-by: Alexander Aring Signed-off-by: David S. Miller --- net/sched/sch_drr.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c index bf638ce57c50..e0b0cf8a9939 100644 --- a/net/sched/sch_drr.c +++ b/net/sched/sch_drr.c @@ -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; }