davidlt/kernel-ark
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ethtool: provide UAPI for PHY master/slave configuration.

Browse Source 
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@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel 2020-05-05 08:35:05 +02:00 committed by David S. Miller
parent 3d59a5837c
commit bdbdac7649
9 changed files with 197 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
Documentation/networking/ethtool-netlink.rst
View File

@ -392,14 +392,16 @@ Request contents:
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested reply header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
==================================== ====== ==========================
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested reply header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG`` u8 Master/slave port mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE`` u8 Master/slave port state
========================================== ====== ==========================
For ``ETHTOOL_A_LINKMODES_OURS``, value represents advertised modes and mask
represents supported modes. ``ETHTOOL_A_LINKMODES_PEER`` in the reply is a bit
@ -414,14 +416,15 @@ LINKMODES_SET
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested request header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
==================================== ====== ==========================
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested request header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG`` u8 Master/slave port mode
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_OURS`` bit set allows setting advertised link modes. If
autonegotiation is on (either set now or kept from before), advertised modes

4
drivers/net/phy/phy.c
View File

@ -295,7 +295,7 @@ int phy_ethtool_ksettings_set(struct phy_device *phydev,
phydev->advertising, autoneg == AUTONEG_ENABLE);
phydev->duplex = duplex;
phydev->master_slave_set = cmd->base.master_slave_cfg;
phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
/* Restart the PHY */
@ -314,6 +314,8 @@ void phy_ethtool_ksettings_get(struct phy_device *phydev,
cmd->base.speed = phydev->speed;
cmd->base.duplex = phydev->duplex;
cmd->base.master_slave_cfg = phydev->master_slave_get;
cmd->base.master_slave_state = phydev->master_slave_state;
if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
cmd->base.port = PORT_BNC;
else

94
drivers/net/phy/phy_device.c
View File

@ -1913,6 +1913,90 @@ int genphy_setup_forced(struct phy_device *phydev)
}
EXPORT_SYMBOL(genphy_setup_forced);
static int genphy_setup_master_slave(struct phy_device *phydev)
{
u16 ctl = 0;
if (!phydev->is_gigabit_capable)
return 0;
switch (phydev->master_slave_set) {
case MASTER_SLAVE_CFG_MASTER_PREFERRED:
ctl |= CTL1000_PREFER_MASTER;
break;
case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
break;
case MASTER_SLAVE_CFG_MASTER_FORCE:
ctl |= CTL1000_AS_MASTER;
/* fallthrough */
case MASTER_SLAVE_CFG_SLAVE_FORCE:
ctl |= CTL1000_ENABLE_MASTER;
break;
case MASTER_SLAVE_CFG_UNKNOWN:
case MASTER_SLAVE_CFG_UNSUPPORTED:
return 0;
default:
phydev_warn(phydev, "Unsupported Master/Slave mode\n");
return -EOPNOTSUPP;
}
return phy_modify_changed(phydev, MII_CTRL1000,
(CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER |
CTL1000_PREFER_MASTER), ctl);
}
static int genphy_read_master_slave(struct phy_device *phydev)
{
int cfg, state;
u16 val;
if (!phydev->is_gigabit_capable) {
phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED;
phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED;
return 0;
}
phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN;
phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
val = phy_read(phydev, MII_CTRL1000);
if (val < 0)
return val;
if (val & CTL1000_ENABLE_MASTER) {
if (val & CTL1000_AS_MASTER)
cfg = MASTER_SLAVE_CFG_MASTER_FORCE;
else
cfg = MASTER_SLAVE_CFG_SLAVE_FORCE;
} else {
if (val & CTL1000_PREFER_MASTER)
cfg = MASTER_SLAVE_CFG_MASTER_PREFERRED;
else
cfg = MASTER_SLAVE_CFG_SLAVE_PREFERRED;
}
val = phy_read(phydev, MII_STAT1000);
if (val < 0)
return val;
if (val & LPA_1000MSFAIL) {
state = MASTER_SLAVE_STATE_ERR;
} else if (phydev->link) {
/* this bits are valid only for active link */
if (val & LPA_1000MSRES)
state = MASTER_SLAVE_STATE_MASTER;
else
state = MASTER_SLAVE_STATE_SLAVE;
} else {
state = MASTER_SLAVE_STATE_UNKNOWN;
}
phydev->master_slave_get = cfg;
phydev->master_slave_state = state;
return 0;
}
/**
* genphy_restart_aneg - Enable and Restart Autonegotiation
* @phydev: target phy_device struct
@ -1971,6 +2055,12 @@ int __genphy_config_aneg(struct phy_device *phydev, bool changed)
if (genphy_config_eee_advert(phydev))
changed = true;
err = genphy_setup_master_slave(phydev);
if (err < 0)
return err;
else if (err)
changed = true;
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
@ -2205,6 +2295,10 @@ int genphy_read_status(struct phy_device *phydev)
phydev->pause = 0;
phydev->asym_pause = 0;
err = genphy_read_master_slave(phydev);
if (err < 0)
return err;
err = genphy_read_lpa(phydev);
if (err < 0)
return err;

3
include/linux/phy.h
View File

@ -477,6 +477,9 @@ struct phy_device {
int duplex;
int pause;
int asym_pause;
u8 master_slave_get;
u8 master_slave_set;
u8 master_slave_state;
/* Union of PHY and Attached devices' supported link modes */
/* See ethtool.h for more info */

16
include/uapi/linux/ethtool.h
View File

@ -1666,6 +1666,18 @@ static inline int ethtool_validate_duplex(__u8 duplex)
return 0;
}
#define MASTER_SLAVE_CFG_UNSUPPORTED 0
#define MASTER_SLAVE_CFG_UNKNOWN 1
#define MASTER_SLAVE_CFG_MASTER_PREFERRED 2
#define MASTER_SLAVE_CFG_SLAVE_PREFERRED 3
#define MASTER_SLAVE_CFG_MASTER_FORCE 4
#define MASTER_SLAVE_CFG_SLAVE_FORCE 5
#define MASTER_SLAVE_STATE_UNSUPPORTED 0
#define MASTER_SLAVE_STATE_UNKNOWN 1
#define MASTER_SLAVE_STATE_MASTER 2
#define MASTER_SLAVE_STATE_SLAVE 3
#define MASTER_SLAVE_STATE_ERR 4
/* Which connector port. */
#define PORT_TP 0x00
#define PORT_AUI 0x01
@ -1904,7 +1916,9 @@ struct ethtool_link_settings {
__u8 eth_tp_mdix_ctrl;
__s8 link_mode_masks_nwords;
__u8 transceiver;
__u8 reserved1[3];
__u8 master_slave_cfg;
__u8 master_slave_state;
__u8 reserved1[1];
__u32 reserved[7];
__u32 link_mode_masks[0];
/* layout of link_mode_masks fields:

2
include/uapi/linux/ethtool_netlink.h
View File

@ -216,6 +216,8 @@ 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
include/uapi/linux/mii.h
View File

@ -151,11 +151,13 @@
/* 1000BASE-T Control register */
#define ADVERTISE_1000FULL 0x0200 /* Advertise 1000BASE-T full duplex */
#define ADVERTISE_1000HALF 0x0100 /* Advertise 1000BASE-T half duplex */
#define CTL1000_PREFER_MASTER 0x0400 /* prefer to operate as master */
#define CTL1000_AS_MASTER 0x0800
#define CTL1000_ENABLE_MASTER 0x1000
/* 1000BASE-T Status register */
#define LPA_1000MSFAIL 0x8000 /* Master/Slave resolution failure */
#define LPA_1000MSRES 0x4000 /* Master/Slave resolution status */
#define LPA_1000LOCALRXOK 0x2000 /* Link partner local receiver status */
#define LPA_1000REMRXOK 0x1000 /* Link partner remote receiver status */
#define LPA_1000FULL 0x0800 /* Link partner 1000BASE-T full duplex */

6
net/ethtool/ioctl.c
View File

@ -552,6 +552,8 @@ static int ethtool_get_link_ksettings(struct net_device *dev,
link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
link_ksettings.base.link_mode_masks_nwords
= __ETHTOOL_LINK_MODE_MASK_NU32;
link_ksettings.base.master_slave_cfg = MASTER_SLAVE_CFG_UNSUPPORTED;
link_ksettings.base.master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED;
return store_link_ksettings_for_user(useraddr, &link_ksettings);
}
@ -589,6 +591,10 @@ static int ethtool_set_link_ksettings(struct net_device *dev,
!= link_ksettings.base.link_mode_masks_nwords)
return -EINVAL;
if (link_ksettings.base.master_slave_cfg ||
link_ksettings.base.master_slave_state)
return -EINVAL;
err = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
if (err >= 0) {
ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);

53
net/ethtool/linkmodes.c
View File

@ -27,6 +27,8 @@ linkmodes_get_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
[ETHTOOL_A_LINKMODES_PEER] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE] = { .type = NLA_REJECT },
};
static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
@ -63,6 +65,7 @@ static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
{
const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
const struct ethtool_link_ksettings *ksettings = &data->ksettings;
const struct ethtool_link_settings *lsettings = &ksettings->base;
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
int len, ret;
@ -86,6 +89,12 @@ static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
len += ret;
}
if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
len += nla_total_size(sizeof(u8));
if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
len += nla_total_size(sizeof(u8));
return len;
}
@ -122,6 +131,16 @@ static int linkmodes_fill_reply(struct sk_buff *skb,
nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
return -EMSGSIZE;
if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
lsettings->master_slave_cfg))
return -EMSGSIZE;
if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
lsettings->master_slave_state))
return -EMSGSIZE;
return 0;
}
@ -249,6 +268,8 @@ linkmodes_set_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
[ETHTOOL_A_LINKMODES_PEER] = { .type = NLA_REJECT },
[ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 },
[ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 },
[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 },
[ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE] = { .type = NLA_REJECT },
};
/* Set advertised link modes to all supported modes matching requested speed
@ -287,14 +308,45 @@ static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
__ETHTOOL_LINK_MODE_MASK_NBITS);
}
static bool ethnl_validate_master_slave_cfg(u8 cfg)
{
switch (cfg) {
case MASTER_SLAVE_CFG_MASTER_PREFERRED:
case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
case MASTER_SLAVE_CFG_MASTER_FORCE:
case MASTER_SLAVE_CFG_SLAVE_FORCE:
return true;
}
return false;
}
static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
struct ethtool_link_ksettings *ksettings,
bool *mod)
{
struct ethtool_link_settings *lsettings = &ksettings->base;
bool req_speed, req_duplex;
const struct nlattr *master_slave_cfg;
int ret;
master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
if (master_slave_cfg) {
u8 cfg = nla_get_u8(master_slave_cfg);
if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
"master/slave configuration not supported by device");
return -EOPNOTSUPP;
}
if (!ethnl_validate_master_slave_cfg(cfg)) {
NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
"master/slave value is invalid");
return -EOPNOTSUPP;
}
}
*mod = false;
req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
@ -311,6 +363,7 @@ static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
mod);
ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
mod);
ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
(req_speed || req_duplex) &&