[net-next Patch V4 1/4] sch_htb: Allow HTB priority parameter in offload mode

[Hariprasad Kelam]

From: Naveen Mamindlapalli <naveenm@xxxxxxxxxxx>

The current implementation of HTB offload returns the EINVAL error
for unsupported parameters like prio and quantum. This patch removes
the error returning checks for 'prio' parameter and populates its
value to tc_htb_qopt_offload structure such that driver can use the
same.

Add prio parameter check in mlx5 driver, as mlx5 devices are not capable
of supporting the prio parameter when htb offload is used. Report error
if prio parameter is set to a non-default value.

Signed-off-by: Naveen Mamindlapalli <naveenm@xxxxxxxxxxx>
Co-developed-by: Rahul Rameshbabu <rrameshbabu@xxxxxxxxxx>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@xxxxxxxxxx>
Signed-off-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@xxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/qos.c | 7 ++++++-
 include/net/pkt_cls.h                            | 1 +
 net/sched/sch_htb.c                              | 7 +++----
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/qos.c b/drivers/net/ethernet/mellanox/mlx5/core/en/qos.c
index 2842195ee548..b683dc787827 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/qos.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/qos.c
@@ -379,6 +379,12 @@ int mlx5e_htb_setup_tc(struct mlx5e_priv *priv, struct tc_htb_qopt_offload *htb_
 	if (!htb && htb_qopt->command != TC_HTB_CREATE)
 		return -EINVAL;
 
+	if (htb_qopt->prio) {
+		NL_SET_ERR_MSG_MOD(htb_qopt->extack,
+				   "prio parameter is not supported by device with HTB offload enabled.");
+		return -EINVAL;
+	}
+
 	switch (htb_qopt->command) {
 	case TC_HTB_CREATE:
 		if (!mlx5_qos_is_supported(priv->mdev)) {
@@ -515,4 +521,3 @@ int mlx5e_mqprio_rl_get_node_hw_id(struct mlx5e_mqprio_rl *rl, int tc, u32 *hw_i
 	*hw_id = rl->leaves_id[tc];
 	return 0;
 }
-
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index cd410a87517b..65d50ed60b41 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -854,6 +854,7 @@ struct tc_htb_qopt_offload {
 	u16 qid;
 	u64 rate;
 	u64 ceil;
+	u8 prio;
 };
 
 #define TC_HTB_CLASSID_ROOT U32_MAX
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 92f2975b6a82..1cd9b48c96cd 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1814,10 +1814,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 			NL_SET_ERR_MSG(extack, "HTB offload doesn't support the quantum parameter");
 			goto failure;
 		}
-		if (hopt->prio) {
-			NL_SET_ERR_MSG(extack, "HTB offload doesn't support the prio parameter");
-			goto failure;
-		}
 	}
 
 	/* Keeping backward compatible with rate_table based iproute2 tc */
@@ -1913,6 +1909,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 					TC_HTB_CLASSID_ROOT,
 				.rate = max_t(u64, hopt->rate.rate, rate64),
 				.ceil = max_t(u64, hopt->ceil.rate, ceil64),
+				.prio = hopt->prio,
 				.extack = extack,
 			};
 			err = htb_offload(dev, &offload_opt);
@@ -1933,6 +1930,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 					TC_H_MIN(parent->common.classid),
 				.rate = max_t(u64, hopt->rate.rate, rate64),
 				.ceil = max_t(u64, hopt->ceil.rate, ceil64),
+				.prio = hopt->prio,
 				.extack = extack,
 			};
 			err = htb_offload(dev, &offload_opt);
@@ -2018,6 +2016,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 				.classid = cl->common.classid,
 				.rate = max_t(u64, hopt->rate.rate, rate64),
 				.ceil = max_t(u64, hopt->ceil.rate, ceil64),
+				.prio = hopt->prio,
 				.extack = extack,
 			};
 			err = htb_offload(dev, &offload_opt);
-- 
2.17.1