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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-10-01 20:32:07 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2017-05-05 18:42:38 +0100
commit34ec4d4141b845027bcb7f8de6e76083deaeb534 (patch)
treec51945f5b733f27960395e558f9ed70369cd2dbb
parent4f2b018f7c6dc069cdecef02b7c1dda0acf987ef (diff)
phylink: add flow control support
Add flow control support, including ethtool support, to phylink. We add support to allow ethtool to get and set the current flow control settings, and the 802.3 specified resolution for the local and remote link partner abilities. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--drivers/net/phy/phylink.c136
-rw-r--r--include/linux/phylink.h8
2 files changed, 142 insertions, 2 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 3ae907f16a93..a749358ab2ca 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -155,6 +155,9 @@ static int phylink_parse_fixedlink(struct phylink *pl, struct device_node *np)
if (of_property_read_bool(fixed_node, "full-duplex"))
pl->link_config.duplex = DUPLEX_FULL;
+
+ /* We treat the "pause" and "asym-pause" terminology as
+ * defining the link partner's ability. */
if (of_property_read_bool(fixed_node, "pause"))
pl->link_config.pause |= MLO_PAUSE_SYM;
if (of_property_read_bool(fixed_node, "asym-pause"))
@@ -306,6 +309,56 @@ static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_stat
state->link = !!gpiod_get_value(pl->link_gpio);
}
+/* Flow control is resolved according to our and the link partners
+ * advertisments using the following drawn from the 802.3 specs:
+ * Local device Link partner
+ * Pause AsymDir Pause AsymDir Result
+ * 1 X 1 X TX+RX
+ * 0 1 1 1 RX
+ * 1 1 0 1 TX
+ */
+static void phylink_resolve_flow(struct phylink *pl,
+ struct phylink_link_state *state)
+{
+ int new_pause = 0;
+
+ if (pl->link_config.pause & MLO_PAUSE_AN) {
+ int pause = 0;
+
+ if (phylink_test(pl->link_config.advertising, Pause))
+ pause |= MLO_PAUSE_SYM;
+ if (phylink_test(pl->link_config.advertising, Asym_Pause))
+ pause |= MLO_PAUSE_ASYM;
+
+ pause &= state->pause;
+
+ if (pause & MLO_PAUSE_SYM)
+ new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
+ else if (pause & MLO_PAUSE_ASYM)
+ new_pause = state->pause & MLO_PAUSE_SYM ?
+ MLO_PAUSE_RX : MLO_PAUSE_TX;
+ } else {
+ new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
+ }
+
+ state->pause &= ~MLO_PAUSE_TXRX_MASK;
+ state->pause |= new_pause;
+}
+
+static const char *phylink_pause_to_str(int pause)
+{
+ switch (pause & MLO_PAUSE_TXRX_MASK) {
+ case MLO_PAUSE_TX | MLO_PAUSE_RX:
+ return "rx/tx";
+ case MLO_PAUSE_TX:
+ return "tx";
+ case MLO_PAUSE_RX:
+ return "rx";
+ default:
+ return "off";
+ }
+}
+
static void phylink_resolve(struct work_struct *w)
{
struct phylink *pl = container_of(w, struct phylink, resolve);
@@ -319,6 +372,7 @@ static void phylink_resolve(struct work_struct *w)
switch (pl->link_an_mode) {
case MLO_AN_PHY:
link_state = pl->phy_state;
+ phylink_resolve_flow(pl, &link_state);
break;
case MLO_AN_FIXED:
@@ -327,9 +381,12 @@ static void phylink_resolve(struct work_struct *w)
case MLO_AN_SGMII:
phylink_get_mac_state(pl, &link_state);
- if (pl->phydev)
+ if (pl->phydev) {
link_state.link = link_state.link &&
pl->phy_state.link;
+ link_state.pause |= pl->phy_state.pause;
+ phylink_resolve_flow(pl, &link_state);
+ }
break;
case MLO_AN_8023Z:
@@ -359,7 +416,7 @@ static void phylink_resolve(struct work_struct *w)
"Link is Up - %s/%s - flow control %s\n",
phy_speed_to_str(link_state.speed),
phy_duplex_to_str(link_state.duplex),
- link_state.pause ? "rx/tx" : "off");
+ phylink_pause_to_str(link_state.pause));
}
}
mutex_unlock(&pl->state_mutex);
@@ -387,6 +444,7 @@ struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
pl->netdev = ndev;
pl->link_interface = iface;
pl->link_port = PORT_MII;
+ pl->link_config.pause = MLO_PAUSE_AN;
pl->link_config.speed = SPEED_UNKNOWN;
pl->link_config.duplex = DUPLEX_UNKNOWN;
pl->ops = ops;
@@ -587,6 +645,7 @@ void phylink_start(struct phylink *pl)
* a fixed-link to start with the correct parameters, and also
* ensures that we set the appropriate advertisment for Serdes links.
*/
+ phylink_resolve_flow(pl, &pl->link_config);
phylink_mac_config(pl, &pl->link_config);
clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
@@ -829,6 +888,79 @@ int phylink_ethtool_nway_reset(struct phylink *pl)
}
EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
+void phylink_ethtool_get_pauseparam(struct phylink *pl,
+ struct ethtool_pauseparam *pause)
+{
+ mutex_lock(&pl->config_mutex);
+
+ pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
+ pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
+ pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
+
+ mutex_unlock(&pl->config_mutex);
+}
+EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
+
+static int __phylink_ethtool_set_pauseparam(struct phylink *pl,
+ struct ethtool_pauseparam *pause)
+{
+ struct phylink_link_state *config = &pl->link_config;
+
+ if (!phylink_test(pl->supported, Pause) &&
+ !phylink_test(pl->supported, Asym_Pause))
+ return -EOPNOTSUPP;
+
+ if (!phylink_test(pl->supported, Asym_Pause) &&
+ !pause->autoneg && pause->rx_pause != pause->tx_pause)
+ return -EINVAL;
+
+ config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
+
+ if (pause->autoneg)
+ config->pause |= MLO_PAUSE_AN;
+ if (pause->rx_pause)
+ config->pause |= MLO_PAUSE_RX;
+ if (pause->tx_pause)
+ config->pause |= MLO_PAUSE_TX;
+
+ if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
+ switch (pl->link_an_mode) {
+ case MLO_AN_PHY:
+ /* Silently mark the carrier down, and then trigger a resolve */
+ netif_carrier_off(pl->netdev);
+ phylink_run_resolve(pl);
+ break;
+
+ case MLO_AN_FIXED:
+ /* Should we allow fixed links to change against the config? */
+ phylink_resolve_flow(pl, config);
+ phylink_mac_config(pl, config);
+ break;
+
+ case MLO_AN_SGMII:
+ case MLO_AN_8023Z:
+ phylink_mac_config(pl, config);
+ phylink_mac_an_restart(pl);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+int phylink_ethtool_set_pauseparam(struct phylink *pl,
+ struct ethtool_pauseparam *pause)
+{
+ int ret;
+
+ mutex_lock(&pl->config_mutex);
+ ret = __phylink_ethtool_set_pauseparam(pl, pause);
+ mutex_unlock(&pl->config_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
+
/* This emulates MII registers for a fixed-mode phy operating as per the
* passed in state. "aneg" defines if we report negotiation is possible.
*
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index f9f7725b91c2..b890b01f15c6 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -13,6 +13,10 @@ enum {
MLO_PAUSE_NONE,
MLO_PAUSE_ASYM = BIT(0),
MLO_PAUSE_SYM = BIT(1),
+ MLO_PAUSE_RX = BIT(2),
+ MLO_PAUSE_TX = BIT(3),
+ MLO_PAUSE_TXRX_MASK = MLO_PAUSE_TX | MLO_PAUSE_RX,
+ MLO_PAUSE_AN = BIT(4),
MLO_AN_PHY = 0, /* Conventional PHY */
MLO_AN_FIXED, /* Fixed-link mode */
@@ -127,6 +131,10 @@ int phylink_ethtool_ksettings_get(struct phylink *,
int phylink_ethtool_ksettings_set(struct phylink *,
const struct ethtool_link_ksettings *);
int phylink_ethtool_nway_reset(struct phylink *);
+void phylink_ethtool_get_pauseparam(struct phylink *,
+ struct ethtool_pauseparam *);
+int phylink_ethtool_set_pauseparam(struct phylink *,
+ struct ethtool_pauseparam *);
int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
int phylink_set_link(struct phylink *pl, unsigned int mode, u8 port,