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Message-Id: <20200526091025.25243-1-o.rempel@pengutronix.de>
Date: Tue, 26 May 2020 11:10:25 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Andrew Lunn <andrew@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Jonathan Corbet <corbet@....net>,
Michal Kubecek <mkubecek@...e.cz>,
"John W. Linville" <linville@...driver.com>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
David Jander <david@...tonic.nl>, kernel@...gutronix.de,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Russell King <linux@...linux.org.uk>, mkl@...gutronix.de,
Marek Vasut <marex@...x.de>,
Christian Herber <christian.herber@....com>,
Amit Cohen <amitc@...lanox.com>,
Petr Machata <petrm@...lanox.com>
Subject: [PATCH ethtool v1] netlink: add master/slave configuration support
This UAPI is needed for BroadR-Reach 100BASE-T1 devices. Due to lack of
auto-negotiation support, we needed to be able to configure the
MASTER-SLAVE role of the port manually or from an application in user
space.
The same UAPI can be used for 1000BASE-T or MultiGBASE-T devices to
force MASTER or SLAVE role. See IEEE 802.3-2018:
22.2.4.3.7 MASTER-SLAVE control register (Register 9)
22.2.4.3.8 MASTER-SLAVE status register (Register 10)
40.5.2 MASTER-SLAVE configuration resolution
45.2.1.185.1 MASTER-SLAVE config value (1.2100.14)
45.2.7.10 MultiGBASE-T AN control 1 register (Register 7.32)
The MASTER-SLAVE role affects the clock configuration:
-------------------------------------------------------------------------------
When the PHY is configured as MASTER, the PMA Transmit function shall
source TX_TCLK from a local clock source. When configured as SLAVE, the
PMA Transmit function shall source TX_TCLK from the clock recovered from
data stream provided by MASTER.
iMX6Q KSZ9031 XXX
------\ /-----------\ /------------\
| | | | |
MAC |<----RGMII----->| PHY Slave |<------>| PHY Master |
|<--- 125 MHz ---+-<------/ | | \ |
------/ \-----------/ \------------/
^
\-TX_TCLK
-------------------------------------------------------------------------------
Since some clock or link related issues are only reproducible in a
specific MASTER-SLAVE-role, MAC and PHY configuration, it is beneficial
to provide generic (not 100BASE-T1 specific) interface to the user space
for configuration flexibility and trouble shooting.
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
netlink/desc-ethtool.c | 2 ++
netlink/settings.c | 50 ++++++++++++++++++++++++++++++++++++
uapi/linux/ethtool.h | 11 ++++++++
uapi/linux/ethtool_netlink.h | 2 ++
4 files changed, 65 insertions(+)
diff --git a/netlink/desc-ethtool.c b/netlink/desc-ethtool.c
index 76c6f13..b0a793c 100644
--- a/netlink/desc-ethtool.c
+++ b/netlink/desc-ethtool.c
@@ -85,6 +85,8 @@ static const struct pretty_nla_desc __linkmodes_desc[] = {
NLATTR_DESC_NESTED(ETHTOOL_A_LINKMODES_PEER, bitset),
NLATTR_DESC_U32(ETHTOOL_A_LINKMODES_SPEED),
NLATTR_DESC_U8(ETHTOOL_A_LINKMODES_DUPLEX),
+ NLATTR_DESC_U8(ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG),
+ NLATTR_DESC_U8(ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE),
};
static const struct pretty_nla_desc __linkstate_desc[] = {
diff --git a/netlink/settings.c b/netlink/settings.c
index 8be5a22..76ca862 100644
--- a/netlink/settings.c
+++ b/netlink/settings.c
@@ -37,6 +37,21 @@ static const char *const names_duplex[] = {
[DUPLEX_FULL] = "Full",
};
+static const char *const names_master_slave_state[] = {
+ [PORT_MODE_STATE_UNKNOWN] = "Unknown",
+ [PORT_MODE_STATE_MASTER] = "Master",
+ [PORT_MODE_STATE_SLAVE] = "Slave",
+ [PORT_MODE_STATE_ERR] = "Resolution error",
+};
+
+static const char *const names_master_slave_cfg[] = {
+ [PORT_MODE_CFG_UNKNOWN] = "Unknown",
+ [PORT_MODE_CFG_MASTER_PREFERRED] = "preferred Master",
+ [PORT_MODE_CFG_SLAVE_PREFERRED] = "preferred Slave",
+ [PORT_MODE_CFG_MASTER_FORCE] = "forced Master",
+ [PORT_MODE_CFG_SLAVE_FORCE] = "forced Slave",
+};
+
static const char *const names_port[] = {
[PORT_TP] = "Twisted Pair",
[PORT_AUI] = "AUI",
@@ -520,6 +535,25 @@ int linkmodes_reply_cb(const struct nlmsghdr *nlhdr, void *data)
printf("\tAuto-negotiation: %s\n",
(autoneg == AUTONEG_DISABLE) ? "off" : "on");
}
+ if (tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]) {
+ uint8_t val;
+
+ val = mnl_attr_get_u8(tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]);
+
+ print_banner(nlctx);
+ print_enum(names_master_slave_cfg,
+ ARRAY_SIZE(names_master_slave_cfg), val,
+ "Port mode cfg");
+ }
+ if (tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE]) {
+ uint8_t val;
+
+ val = mnl_attr_get_u8(tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE]);
+ print_banner(nlctx);
+ print_enum(names_master_slave_state,
+ ARRAY_SIZE(names_master_slave_state), val,
+ "Port mode status");
+ }
return MNL_CB_OK;
err:
@@ -827,6 +861,14 @@ static const struct lookup_entry_u32 duplex_values[] = {
{}
};
+static const struct lookup_entry_u32 master_slave_values[] = {
+ { .arg = "master-preferred", .val = PORT_MODE_CFG_MASTER_PREFERRED },
+ { .arg = "slave-preferred", .val = PORT_MODE_CFG_SLAVE_PREFERRED },
+ { .arg = "master-force", .val = PORT_MODE_CFG_MASTER_FORCE },
+ { .arg = "slave-force", .val = PORT_MODE_CFG_SLAVE_FORCE },
+ {}
+};
+
char wol_bit_chars[WOL_MODE_COUNT] = {
[WAKE_PHY_BIT] = 'p',
[WAKE_UCAST_BIT] = 'u',
@@ -917,6 +959,14 @@ static const struct param_parser sset_params[] = {
.handler_data = duplex_values,
.min_argc = 1,
},
+ {
+ .arg = "master-slave",
+ .group = ETHTOOL_MSG_LINKMODES_SET,
+ .type = ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
+ .handler = nl_parse_lookup_u8,
+ .handler_data = master_slave_values,
+ .min_argc = 1,
+ },
{
.arg = "wol",
.group = ETHTOOL_MSG_WOL_SET,
diff --git a/uapi/linux/ethtool.h b/uapi/linux/ethtool.h
index d3dcb45..d2872f9 100644
--- a/uapi/linux/ethtool.h
+++ b/uapi/linux/ethtool.h
@@ -1659,6 +1659,17 @@ static __inline__ int ethtool_validate_duplex(__u8 duplex)
return 0;
}
+/* Port mode */
+#define PORT_MODE_CFG_UNKNOWN 1
+#define PORT_MODE_CFG_MASTER_PREFERRED 2
+#define PORT_MODE_CFG_SLAVE_PREFERRED 3
+#define PORT_MODE_CFG_MASTER_FORCE 4
+#define PORT_MODE_CFG_SLAVE_FORCE 5
+#define PORT_MODE_STATE_UNKNOWN 1
+#define PORT_MODE_STATE_MASTER 2
+#define PORT_MODE_STATE_SLAVE 3
+#define PORT_MODE_STATE_ERR 4
+
/* Which connector port. */
#define PORT_TP 0x00
#define PORT_AUI 0x01
diff --git a/uapi/linux/ethtool_netlink.h b/uapi/linux/ethtool_netlink.h
index ad6d3a0..73a720c 100644
--- a/uapi/linux/ethtool_netlink.h
+++ b/uapi/linux/ethtool_netlink.h
@@ -185,6 +185,8 @@ enum {
ETHTOOL_A_LINKMODES_PEER, /* bitset */
ETHTOOL_A_LINKMODES_SPEED, /* u32 */
ETHTOOL_A_LINKMODES_DUPLEX, /* u8 */
+ ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG, /* u8 */
+ ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE, /* u8 */
/* add new constants above here */
__ETHTOOL_A_LINKMODES_CNT,
--
2.26.2
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