linux-kernel - [net-next Patch v2 1/5] sch_htb: Allow HTB priority parameter in offload mode

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Message-ID: <20230118105107.9516-2-hkelam@marvell.com>
Date:   Wed, 18 Jan 2023 16:21:03 +0530
From:   Hariprasad Kelam <hkelam@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <kuba@...nel.org>, <davem@...emloft.net>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <sgoutham@...vell.com>,
        <lcherian@...vell.com>, <gakula@...vell.com>, <jerinj@...vell.com>,
        <sbhatta@...vell.com>, <jhs@...atatu.com>,
        <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <saeedm@...dia.com>, <richardcochran@...il.com>,
        <tariqt@...dia.com>, <linux-rdma@...r.kernel.org>,
        <maxtram95@...il.com>
Subject: [net-next Patch v2 1/5] sch_htb: Allow HTB priority parameter in offload mode

From: Naveen Mamindlapalli <naveenm@...vell.com>

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@...vell.com>
Co-developed-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
---
v2*  ensure other drivers won't effect by allowing 'prio'
     parameter in htb offload mode


 drivers/net/ethernet/mellanox/mlx5/core/en/qos.c | 6 ++++++
 include/net/pkt_cls.h                            | 1 +
 net/sched/sch_htb.c                              | 7 +++----
 3 files changed, 10 insertions(+), 4 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..e16b3d6ea471 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(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)) {
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 4cabb32a2ad9..02afb1baf39d 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -864,6 +864,7 @@ 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 2238edece1a4..f2d034cdd7bd 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1806,10 +1806,6 @@ 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 */
@@ -1905,6 +1901,7 @@ 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);
@@ -1925,6 +1922,7 @@ 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);
@@ -2010,6 +2008,7 @@ 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