linux-kernel - [PATCH net 2/2] net: stmmac: Limit the number of MTL queues to maximum value

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Message-Id: <20250116020853.2835521-2-hayashi.kunihiko@socionext.com>
Date: Thu, 16 Jan 2025 11:08:53 +0900
From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.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>
Cc: netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Subject: [PATCH net 2/2] net: stmmac: Limit the number of MTL queues to maximum value

The number of MTL queues to use is specified by the parameter
"snps,{tx,rx}-queues-to-use" from the platform layer.

However, the maximum number of queues is determined by
the macro MTL_MAX_{TX,RX}_QUEUES. It's appropriate to limit the
values not to exceed the upper limit values.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index ad868e8d195d..471eb1a99d90 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -165,6 +165,8 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 	if (of_property_read_u32(rx_node, "snps,rx-queues-to-use",
 				 &plat->rx_queues_to_use))
 		plat->rx_queues_to_use = 1;
+	if (plat->rx_queues_to_use > MTL_MAX_RX_QUEUES)
+		plat->rx_queues_to_use = MTL_MAX_RX_QUEUES;
 
 	if (of_property_read_bool(rx_node, "snps,rx-sched-sp"))
 		plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
@@ -224,6 +226,8 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 	if (of_property_read_u32(tx_node, "snps,tx-queues-to-use",
 				 &plat->tx_queues_to_use))
 		plat->tx_queues_to_use = 1;
+	if (plat->tx_queues_to_use > MTL_MAX_TX_QUEUES)
+		plat->tx_queues_to_use = MTL_MAX_TX_QUEUES;
 
 	if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
 		plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
-- 
2.25.1