netdev - [PATCH net-next 2/6] net: enetc: detect frame preemption hardware capability

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Date:   Thu, 19 Jan 2023 18:04:27 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>
Subject: [PATCH net-next 2/6] net: enetc: detect frame preemption hardware capability

Similar to other TSN features, query the Station Interface capability
register to see whether preemption is supported on this port or not.
On LS1028A, preemption is available on ports 0 and 2, but not on 1
and 3.

This will allow us in the future to write the pMAC registers only on the
ENETC ports where a pMAC actually exists.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c    | 3 +++
 drivers/net/ethernet/freescale/enetc/enetc.h    | 5 +++--
 drivers/net/ethernet/freescale/enetc/enetc_hw.h | 3 ++-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 91f61249451a..c4b8d35f6cf2 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1713,6 +1713,9 @@ void enetc_get_si_caps(struct enetc_si *si)
 	if (val & ENETC_SIPCAPR0_QBV)
 		si->hw_features |= ENETC_SI_F_QBV;
 
+	if (val & ENETC_SIPCAPR0_QBU)
+		si->hw_features |= ENETC_SI_F_QBU;
+
 	if (val & ENETC_SIPCAPR0_PSFP)
 		si->hw_features |= ENETC_SI_F_PSFP;
 }
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 6a87aa972e1e..cb227c93a07b 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -229,8 +229,9 @@ enum enetc_errata {
 	ENETC_ERR_UCMCSWP	= BIT(1),
 };
 
-#define ENETC_SI_F_QBV BIT(0)
-#define ENETC_SI_F_PSFP BIT(1)
+#define ENETC_SI_F_PSFP BIT(0)
+#define ENETC_SI_F_QBV  BIT(1)
+#define ENETC_SI_F_QBU  BIT(2)
 
 /* PCI IEP device data */
 struct enetc_si {
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 18ca1f42b1f7..cc8f1afdc3bc 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -18,9 +18,10 @@
 #define ENETC_SICTR0	0x18
 #define ENETC_SICTR1	0x1c
 #define ENETC_SIPCAPR0	0x20
-#define ENETC_SIPCAPR0_QBV	BIT(4)
 #define ENETC_SIPCAPR0_PSFP	BIT(9)
 #define ENETC_SIPCAPR0_RSS	BIT(8)
+#define ENETC_SIPCAPR0_QBV	BIT(4)
+#define ENETC_SIPCAPR0_QBU	BIT(3)
 #define ENETC_SIPCAPR1	0x24
 #define ENETC_SITGTGR	0x30
 #define ENETC_SIRBGCR	0x38
-- 
2.34.1