net: stmmac: dwmac4: Report DCB feature capability

Bit 16 of the MAC HW Feature1 register reports the DCB (Data Centre
Bridging) feature. Read it so that dma_cap.dcben and the debugfs
report it accurately. Right now it is always reported as being disabled.

Signed-off-by: Ovidiu Panait <ovidiu.panait.rb@renesas.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260603173644.24371-1-ovidiu.panait.rb@renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index ffcd036d4c024f2fbbe846de7a5f4cbabe3bd403..6382836828bac6caed44f1a55b9c0cc34b2df9e1 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -198,6 +198,7 @@ enum power_event {
 #define GMAC_HW_FEAT_AVSEL             BIT(20)
 #define GMAC_HW_TSOEN                  BIT(18)
 #define GMAC_HW_FEAT_SPHEN             BIT(17)
+#define GMAC_HW_FEAT_DCBEN             BIT(16)
 #define GMAC_HW_ADDR64                 GENMASK(15, 14)
 #define GMAC_HW_TXFIFOSIZE             GENMASK(10, 6)
 #define GMAC_HW_RXFIFOSIZE             GENMASK(4, 0)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
index 28728271fbc9efc1082557ed426798fcfa6893bd..829a23bdad01f82edde8f49b5df197fd2e2fb930 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
@@ -391,6 +391,7 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
        dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
        dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
        dma_cap->sphen = (hw_cap & GMAC_HW_FEAT_SPHEN) >> 17;
+       dma_cap->dcben = (hw_cap & GMAC_HW_FEAT_DCBEN) >> 16;
 
        dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
        switch (dma_cap->addr64) {