linux-kernel - [PATCH iwl-next v8 09/11] igc: block setting preemptible traffic class in taprio

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Message-Id: <20250305130026.642219-10-faizal.abdul.rahim@linux.intel.com>
Date: Wed,  5 Mar 2025 08:00:24 -0500
From: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Furong Xu <0x1207@...il.com>,
	Russell King <rmk+kernel@...linux.org.uk>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Serge Semin <fancer.lancer@...il.com>,
	Xiaolei Wang <xiaolei.wang@...driver.com>,
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	Kory Maincent <kory.maincent@...tlin.com>,
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	Jesper Nilsson <jesper.nilsson@...s.com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Chwee-Lin Choong <chwee.lin.choong@...el.com>,
	Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
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	linux-arm-kernel@...ts.infradead.org,
	bpf@...r.kernel.org
Subject: [PATCH iwl-next v8 09/11] igc: block setting preemptible traffic class in taprio

Since preemptible tc implementation is not ready yet, block it from being
set in taprio. The existing code already blocks it in mqprio.

Signed-off-by: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index a9f40fffc4fd..6db926bc9d11 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6407,6 +6407,10 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 	if (!validate_schedule(adapter, qopt))
 		return -EINVAL;
 
+	/* preemptible isn't supported yet */
+	if (qopt->mqprio.preemptible_tcs)
+		return -EOPNOTSUPP;
+
 	igc_ptp_read(adapter, &now);
 
 	if (igc_tsn_is_taprio_activated_by_user(adapter) &&
-- 
2.34.1