Merge branch 'ethtool-master-slave'

Oleksij Rempel says:

====================
provide support for PHY master/slave configuration

changes v6:
- use NL_SET_ERR_MSG_ATTR in ethnl_update_linkmodes
- add sanity checks in the ioctl interface
- use bool for ethnl_validate_master_slave_cfg()

changes v5:
- set MASTER_SLAVE_CFG_UNSUPPORTED as default value
- send a netlink error message on validation error
- more code fixes

changes v4:
- rename port_mode to master_slave
- move validation code to net/ethtool/linkmodes.c
- add UNSUPPORTED state and avoid sending unsupported fields
- more formatting and naming fixes
- tja11xx: support only force mode
- tja11xx: mark state as unsupported

changes v3:
- provide separate field for config and state.
- make state rejected on set
- add validation

changes v2:
- change names. Use MASTER_PREFERRED instead of MULTIPORT
- configure master/slave only on request. Default configuration can be
  provided by PHY or eeprom
- status and configuration to the user space.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 53 insertions, 0 deletions

diff --git a/net/ethtool/linkmodes.c b/net/ethtool/linkmodes.c
index 452608c6d856..fd4f3e58c6f6 100644
--- a/net/ethtool/linkmodes.c
+++ b/net/ethtool/linkmodes.c
@@ -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) &&