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net: sch: sch_cbs: add extack support 

This patch adds extack support for the cbs 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 12:35:23 -05:00 committed by David S. Miller
parent 62a6de62dc
commit 710fb39689
1 changed files with 16 additions and 7 deletions
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23
net/sched/sch_cbs.c
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@ -219,14 +219,17 @@ static void cbs_disable_offload(struct net_device *dev,
}
static int cbs_enable_offload(struct net_device *dev, struct cbs_sched_data *q,
const struct tc_cbs_qopt *opt)
const struct tc_cbs_qopt *opt,
struct netlink_ext_ack *extack)
{
const struct net_device_ops *ops = dev->netdev_ops;
struct tc_cbs_qopt_offload cbs = { };
int err;
if (!ops->ndo_setup_tc)
if (!ops->ndo_setup_tc) {
NL_SET_ERR_MSG(extack, "Specified device does not support cbs offload");
return -EOPNOTSUPP;
}
cbs.queue = q->queue;
@ -237,8 +240,10 @@ static int cbs_enable_offload(struct net_device *dev, struct cbs_sched_data *q,
cbs.sendslope = opt->sendslope;
err = ops->ndo_setup_tc(dev, TC_SETUP_QDISC_CBS, &cbs);
if (err < 0)
if (err < 0) {
NL_SET_ERR_MSG(extack, "Specified device failed to setup cbs hardware offload");
return err;
}
q->enqueue = cbs_enqueue_offload;
q->dequeue = cbs_dequeue_offload;
@ -255,12 +260,14 @@ static int cbs_change(struct Qdisc *sch, struct nlattr *opt,
struct tc_cbs_qopt *qopt;
int err;
err = nla_parse_nested(tb, TCA_CBS_MAX, opt, cbs_policy, NULL);
err = nla_parse_nested(tb, TCA_CBS_MAX, opt, cbs_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_CBS_PARMS])
if (!tb[TCA_CBS_PARMS]) {
NL_SET_ERR_MSG(extack, "Missing CBS parameter which are mandatory");
return -EINVAL;
}
qopt = nla_data(tb[TCA_CBS_PARMS]);
@ -277,7 +284,7 @@ static int cbs_change(struct Qdisc *sch, struct nlattr *opt,
cbs_disable_offload(dev, q);
} else {
err = cbs_enable_offload(dev, q, qopt);
err = cbs_enable_offload(dev, q, qopt, extack);
if (err < 0)
return err;
}
@ -298,8 +305,10 @@ static int cbs_init(struct Qdisc *sch, struct nlattr *opt,
struct cbs_sched_data *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
if (!opt)
if (!opt) {
NL_SET_ERR_MSG(extack, "Missing CBS qdisc options which are mandatory");
return -EINVAL;
}
q->queue = sch->dev_queue - netdev_get_tx_queue(dev, 0);