linux-kernel - [PATCH v2 net-next 06/12] net: lan966x: deny tc-taprio changes to per-tc max SDU

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Date:   Fri, 23 Sep 2022 19:33:04 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Rui Sousa <rui.sousa@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Walle <michael@...le.cc>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Colin Foster <colin.foster@...advantage.com>,
        Richie Pearn <richard.pearn@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Vladimir Oltean <olteanv@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 net-next 06/12] net: lan966x: deny tc-taprio changes to per-tc max SDU

Since the driver does not act upon the max_sdu argument, deny any other
values except the default all-zeroes, which means that all traffic
classes should use the same MTU as the port itself.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v1->v2: patch is new

 drivers/net/ethernet/microchip/lan966x/lan966x_taprio.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_taprio.c b/drivers/net/ethernet/microchip/lan966x/lan966x_taprio.c
index 3f5b212066c5..96367819ff96 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_taprio.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_taprio.c
@@ -219,8 +219,16 @@ static int lan966x_taprio_find_list(struct lan966x_port *port,
 static int lan966x_taprio_check(struct tc_taprio_qopt_offload *qopt)
 {
 	u64 total_time = 0;
+	int tc;
 	u32 i;
 
+	/* Offloading queueMaxSDU is not supported at the moment,
+	 * only accept the default port MTU
+	 */
+	for (tc = 0; tc < 8; tc++)
+		if (qopt->max_sdu[tc])
+			return -EOPNOTSUPP;
+
 	/* This is not supported by th HW */
 	if (qopt->cycle_time_extension)
 		return -EOPNOTSUPP;
-- 
2.34.1