[PATCH net-next 1/2] net: stmmac: dwmac4: Read the UC filter size from hardware capabilities
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COLD49d
IN NET-NEXT
From: Maxime Chevallier <maxime.chevallier@bootlin.com>
Date: 2026-08-31 07:02:00
Also in:
linux-arm-kernel, lkml
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Maxime Chevallier, Linus Torvalds
Queued in net-next as 384ee2379a66 on 2026-09-03.
dwmac4 has multiple banks of perfect filter entries, independently configurable during IP integration. The multi_addr bank reports a number between 0 and 31 corresponding to the actual number of entries in that bank, while the 32 and 64 banks are all-or-nothing. Expose these caps over debugfs as well. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> --- drivers/net/ethernet/stmicro/stmmac/common.h | 2 ++ drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 4 +++- drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 2 ++ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 ++++++++++++ 4 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 927ea6230073..77bd47a83357 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h@@ -419,6 +419,8 @@ struct dma_features { unsigned int half_duplex; unsigned int hash_filter; unsigned int multi_addr; + unsigned int additional_32_addr; + unsigned int additional_64_addr; unsigned int pcs; unsigned int sma_mdio; unsigned int pmt_remote_wake_up;
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index 6382836828ba..89368e34a388 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h@@ -176,7 +176,9 @@ enum power_event { /* MAC HW features0 bitmap */ #define GMAC_HW_FEAT_SAVLANINS BIT(27) -#define GMAC_HW_FEAT_ADDMAC BIT(18) +#define GMAC_HW_FEAT_MACADR64SEL BIT(24) +#define GMAC_HW_FEAT_MACADR32SEL BIT(23) +#define GMAC_HW_FEAT_ADDMAC GENMASK(22, 18) #define GMAC_HW_FEAT_RXCOESEL BIT(16) #define GMAC_HW_FEAT_TXCOSEL BIT(14) #define GMAC_HW_FEAT_EEESEL BIT(13)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
index 23ffe1adcd0d..14ac3f0e51f7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c@@ -388,6 +388,8 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr, dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2; dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4; dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18; + dma_cap->additional_32_addr = (hw_cap & GMAC_HW_FEAT_MACADR32SEL) >> 23; + dma_cap->additional_64_addr = (hw_cap & GMAC_HW_FEAT_MACADR64SEL) >> 24; dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3; dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5; dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index f2fc89176654..a885f8cfef21 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c@@ -6580,6 +6580,18 @@ static int stmmac_dma_cap_show(struct seq_file *seq, void *v) seq_printf(seq, "\tNumber of Additional MAC address registers: %d\n", priv->dma_cap.multi_addr); + } else if (priv->plat->core_type == DWMAC_CORE_GMAC4) { + seq_printf(seq, + "\tNumber of MAC address registers (1-31): %d\n", + priv->dma_cap.multi_addr); + seq_printf(seq, + "\tAdditional 32 MAC address registers (32-63): %s\n", + priv->dma_cap.additional_32_addr ? "Y" : "N"); + seq_printf(seq, + "\tAdditional 64 MAC address registers (64-127): %s\n", + priv->dma_cap.additional_64_addr ? "Y" : "N"); + seq_printf(seq, "\tHash Filter: %s\n", + (priv->dma_cap.hash_filter) ? "Y" : "N"); } else { seq_printf(seq, "\tHash Filter: %s\n", (priv->dma_cap.hash_filter) ? "Y" : "N");
--
2.55.0