linux-kernel - [PATCH] net: stmmac: extend use of snps,multicast-filter-bins property to xgmac

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Message-Id: <20250610200411.3751943-1-nikunj.kela@sima.ai>
Date: Tue, 10 Jun 2025 13:04:11 -0700
From: Nikunj Kela <nikunj.kela@...a.ai>
To: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com
Cc: rmk+kernel@...linux.org.uk,
	prabhakar.mahadev-lad.rj@...renesas.com,
	romain.gantois@...tlin.com,
	inochiama@...il.com,
	l.rubusch@...il.com,
	quentin.schulz@...rry.de,
	netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Nikunj Kela <nikunj.kela@...a.ai>
Subject: [PATCH] net: stmmac: extend use of snps,multicast-filter-bins property to xgmac

Hash based multicast filtering is an optional feature. Currently,
driver overrides the value of multicast_filter_bins based on the hash
table size. If the feature is not supported, hash table size reads 0
however the value of multicast_filter_bins remains set to default
HASH_TABLE_SIZE which is incorrect. Let's extend the use of the property
snps,multicast-filter-bins to xgmac so it can be set to 0 via devicetree
to indicate multicast filtering is not supported.

Signed-off-by: Nikunj Kela <nikunj.kela@...a.ai>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index b80c1efdb323..4164b3a580d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -579,6 +579,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 		plat->pmt = 1;
 		if (of_property_read_bool(np, "snps,tso"))
 			plat->flags |= STMMAC_FLAG_TSO_EN;
+		of_property_read_u32(np, "snps,multicast-filter-bins",
+				     &plat->multicast_filter_bins);
 	}
 
 	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
-- 
2.34.1