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sch_htb: Add extack messages for EOPNOTSUPP errors 

In order to make the "Operation not supported" message clearer to the
user, add extack messages explaining why exactly adding offloaded HTB
could be not supported in each case.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxim Mikityanskiy 2021-10-28 15:24:36 +03:00 committed by David S. Miller
parent 3a26babb41
commit 648a991cf3
1 changed files with 6 additions and 2 deletions
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8
net/sched/sch_htb.c
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@ -1084,11 +1084,15 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt,
offload = nla_get_flag(tb[TCA_HTB_OFFLOAD]);
if (offload) {
if (sch->parent != TC_H_ROOT)
if (sch->parent != TC_H_ROOT) {
NL_SET_ERR_MSG(extack, "HTB must be the root qdisc to use offload");
return -EOPNOTSUPP;
}
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) {
NL_SET_ERR_MSG(extack, "hw-tc-offload ethtool feature flag must be on");
return -EOPNOTSUPP;
}
q->num_direct_qdiscs = dev->real_num_tx_queues;
q->direct_qdiscs = kcalloc(q->num_direct_qdiscs,