[PATCH net-next] 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 <redacted>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
---
 net/sched/sch_htb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index cf1d45db4e84..9267922ea9c3 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c

@@ -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,

-- 
2.25.1

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller [off-list ref]:

On Thu, 28 Oct 2021 15:24:36 +0300 you wrote:

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 <redacted>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>

[...]

Here is the summary with links:
  - [net-next] sch_htb: Add extack messages for EOPNOTSUPP errors
    https://git.kernel.org/netdev/net-next/c/648a991cf316

You are awesome, thank you!
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