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-rw-r--r--drivers/net/phy/Makefile3
-rw-r--r--drivers/net/phy/linkmode.c95
-rw-r--r--drivers/net/phy/phy_device.c43
-rw-r--r--drivers/net/phy/phylink.c162
-rw-r--r--include/linux/linkmode.h8
-rw-r--r--include/linux/phy.h3
-rw-r--r--include/linux/phylink.h34
7 files changed, 258 insertions, 90 deletions
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index fe5badf13b65..d523fd5670e4 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -1,7 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for Linux PHY drivers and MDIO bus drivers
-libphy-y := phy.o phy-c45.o phy-core.o phy_device.o
+libphy-y := phy.o phy-c45.o phy-core.o phy_device.o \
+ linkmode.o
mdio-bus-y += mdio_bus.o mdio_device.o
ifdef CONFIG_MDIO_DEVICE
diff --git a/drivers/net/phy/linkmode.c b/drivers/net/phy/linkmode.c
new file mode 100644
index 000000000000..f60560fe3499
--- /dev/null
+++ b/drivers/net/phy/linkmode.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <linux/linkmode.h>
+
+/**
+ * linkmode_resolve_pause - resolve the allowable pause modes
+ * @local_adv: local advertisement in ethtool format
+ * @partner_adv: partner advertisement in ethtool format
+ * @tx_pause: pointer to bool to indicate whether transmit pause should be
+ * enabled.
+ * @rx_pause: pointer to bool to indicate whether receive pause should be
+ * enabled.
+ *
+ * Flow control is resolved according to our and the link partners
+ * advertisements using the following drawn from the 802.3 specs:
+ * Local device Link partner
+ * Pause AsymDir Pause AsymDir Result
+ * 0 X 0 X Disabled
+ * 0 1 1 0 Disabled
+ * 0 1 1 1 TX
+ * 1 0 0 X Disabled
+ * 1 X 1 X TX+RX
+ * 1 1 0 1 RX
+ */
+void linkmode_resolve_pause(const unsigned long *local_adv,
+ const unsigned long *partner_adv,
+ bool *tx_pause, bool *rx_pause)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(m);
+
+ linkmode_and(m, local_adv, partner_adv);
+ if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, m)) {
+ *tx_pause = true;
+ *rx_pause = true;
+ } else if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, m)) {
+ *tx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ partner_adv);
+ *rx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ local_adv);
+ } else {
+ *tx_pause = false;
+ *rx_pause = false;
+ }
+}
+EXPORT_SYMBOL_GPL(linkmode_resolve_pause);
+
+/**
+ * linkmode_set_pause - set the pause mode advertisement
+ * @advertisement: advertisement in ethtool format
+ * @tx: boolean from ethtool struct ethtool_pauseparam tx_pause member
+ * @rx: boolean from ethtool struct ethtool_pauseparam rx_pause member
+ *
+ * Configure the advertised Pause and Asym_Pause bits according to the
+ * capabilities of provided in @tx and @rx.
+ *
+ * We convert as follows:
+ * tx rx Pause AsymDir
+ * 0 0 0 0
+ * 0 1 1 1
+ * 1 0 0 1
+ * 1 1 1 0
+ *
+ * Note: this translation from ethtool tx/rx notation to the advertisement
+ * is actually very problematical. Here are some examples:
+ *
+ * For tx=0 rx=1, meaning transmit is unsupported, receive is supported:
+ *
+ * Local device Link partner
+ * Pause AsymDir Pause AsymDir Result
+ * 1 1 1 0 TX + RX - but we have no TX support.
+ * 1 1 0 1 Only this gives RX only
+ *
+ * For tx=1 rx=1, meaning we have the capability to transmit and receive
+ * pause frames:
+ *
+ * Local device Link partner
+ * Pause AsymDir Pause AsymDir Result
+ * 1 0 0 1 Disabled - but since we do support tx and rx,
+ * this should resolve to RX only.
+ *
+ * Hence, asking for:
+ * rx=1 tx=0 gives Pause+AsymDir advertisement, but we may end up
+ * resolving to tx+rx pause or only rx pause depending on
+ * the partners advertisement.
+ * rx=0 tx=1 gives AsymDir only, which will only give tx pause if
+ * the partners advertisement allows it.
+ * rx=1 tx=1 gives Pause only, which will only allow tx+rx pause
+ * if the other end also advertises Pause.
+ */
+void linkmode_set_pause(unsigned long *advertisement, bool tx, bool rx)
+{
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertisement, rx);
+ linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertisement,
+ rx ^ tx);
+}
+EXPORT_SYMBOL_GPL(linkmode_set_pause);
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 6a5056e0ae77..2a973265de80 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2361,22 +2361,7 @@ void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx)
__ETHTOOL_DECLARE_LINK_MODE_MASK(oldadv);
linkmode_copy(oldadv, phydev->advertising);
-
- linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
- phydev->advertising);
- linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
- phydev->advertising);
-
- if (rx) {
- linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
- phydev->advertising);
- linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
- phydev->advertising);
- }
-
- if (tx)
- linkmode_change_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
- phydev->advertising);
+ linkmode_set_pause(phydev->advertising, tx, rx);
if (!linkmode_equal(oldadv, phydev->advertising) &&
phydev->autoneg)
@@ -2409,6 +2394,32 @@ bool phy_validate_pause(struct phy_device *phydev,
}
EXPORT_SYMBOL(phy_validate_pause);
+/**
+ * phy_get_pause - resolve negotiated pause modes
+ * @phydev: phy_device struct
+ * @tx_pause: pointer to bool to indicate whether transmit pause should be
+ * enabled.
+ * @rx_pause: pointer to bool to indicate whether receive pause should be
+ * enabled.
+ *
+ * Resolve and return the flow control modes according to the negotiation
+ * result. This includes checking that we are operating in full duplex mode.
+ * See linkmode_resolve_pause() for further details.
+ */
+void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause)
+{
+ if (phydev->duplex != DUPLEX_FULL) {
+ *tx_pause = false;
+ *rx_pause = false;
+ return;
+ }
+
+ return linkmode_resolve_pause(phydev->advertising,
+ phydev->lp_advertising,
+ tx_pause, rx_pause);
+}
+EXPORT_SYMBOL(phy_get_pause);
+
static bool phy_drv_supports_irq(struct phy_driver *phydrv)
{
return phydrv->config_intr && phydrv->ack_interrupt;
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 70b9a143db84..2899fbe699ab 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -181,9 +181,11 @@ static int phylink_parse_fixedlink(struct phylink *pl,
/* We treat the "pause" and "asym-pause" terminology as
* defining the link partner's ability. */
if (fwnode_property_read_bool(fixed_node, "pause"))
- pl->link_config.pause |= MLO_PAUSE_SYM;
+ __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ pl->link_config.lp_advertising);
if (fwnode_property_read_bool(fixed_node, "asym-pause"))
- pl->link_config.pause |= MLO_PAUSE_ASYM;
+ __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+ pl->link_config.lp_advertising);
if (ret == 0) {
desc = fwnode_gpiod_get_index(fixed_node, "link", 0,
@@ -215,9 +217,11 @@ static int phylink_parse_fixedlink(struct phylink *pl,
DUPLEX_FULL : DUPLEX_HALF;
pl->link_config.speed = prop[2];
if (prop[3])
- pl->link_config.pause |= MLO_PAUSE_SYM;
+ __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
+ pl->link_config.lp_advertising);
if (prop[4])
- pl->link_config.pause |= MLO_PAUSE_ASYM;
+ __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+ pl->link_config.lp_advertising);
}
}
@@ -339,6 +343,34 @@ static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
return 0;
}
+static void phylink_apply_manual_flow(struct phylink *pl,
+ struct phylink_link_state *state)
+{
+ /* If autoneg is disabled, pause AN is also disabled */
+ if (!state->an_enabled)
+ state->pause &= ~MLO_PAUSE_AN;
+
+ /* Manual configuration of pause modes */
+ if (!(pl->link_config.pause & MLO_PAUSE_AN))
+ state->pause = pl->link_config.pause;
+}
+
+static void phylink_resolve_flow(struct phylink_link_state *state)
+{
+ bool tx_pause, rx_pause;
+
+ state->pause = MLO_PAUSE_NONE;
+ if (state->duplex == DUPLEX_FULL) {
+ linkmode_resolve_pause(state->advertising,
+ state->lp_advertising,
+ &tx_pause, &rx_pause);
+ if (tx_pause)
+ state->pause |= MLO_PAUSE_TX;
+ if (rx_pause)
+ state->pause |= MLO_PAUSE_RX;
+ }
+}
+
static void phylink_mac_config(struct phylink *pl,
const struct phylink_link_state *state)
{
@@ -387,49 +419,45 @@ static void phylink_mac_pcs_get_state(struct phylink *pl,
/* The fixed state is... fixed except for the link state,
* which may be determined by a GPIO or a callback.
*/
-static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
+static void phylink_get_fixed_state(struct phylink *pl,
+ struct phylink_link_state *state)
{
*state = pl->link_config;
if (pl->get_fixed_state)
pl->get_fixed_state(pl->netdev, state);
else if (pl->link_gpio)
state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
+
+ phylink_resolve_flow(state);
}
-/* Flow control is resolved according to our and the link partners
- * advertisements 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 TX
- * 1 1 0 1 RX
- */
-static void phylink_resolve_flow(struct phylink *pl,
- struct phylink_link_state *state)
+static void phylink_mac_initial_config(struct phylink *pl)
{
- int new_pause = 0;
+ struct phylink_link_state link_state;
- if (pl->link_config.pause & MLO_PAUSE_AN) {
- int pause = 0;
+ switch (pl->cur_link_an_mode) {
+ case MLO_AN_PHY:
+ link_state = pl->phy_state;
+ break;
- 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;
+ case MLO_AN_FIXED:
+ phylink_get_fixed_state(pl, &link_state);
+ break;
- pause &= state->pause;
+ case MLO_AN_INBAND:
+ link_state = pl->link_config;
+ if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
+ link_state.pause = MLO_PAUSE_NONE;
+ break;
- 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_TX : MLO_PAUSE_RX;
- } else {
- new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
+ default: /* can't happen */
+ return;
}
- state->pause &= ~MLO_PAUSE_TXRX_MASK;
- state->pause |= new_pause;
+ link_state.link = false;
+
+ phylink_apply_manual_flow(pl, &link_state);
+ phylink_mac_config(pl, &link_state);
}
static const char *phylink_pause_to_str(int pause)
@@ -493,7 +521,7 @@ static void phylink_resolve(struct work_struct *w)
switch (pl->cur_link_an_mode) {
case MLO_AN_PHY:
link_state = pl->phy_state;
- phylink_resolve_flow(pl, &link_state);
+ phylink_apply_manual_flow(pl, &link_state);
phylink_mac_config_up(pl, &link_state);
break;
@@ -515,9 +543,9 @@ static void phylink_resolve(struct work_struct *w)
link_state.interface = pl->phy_state.interface;
/* If we have a PHY, we need to update with
- * the pause mode bits. */
- link_state.pause |= pl->phy_state.pause;
- phylink_resolve_flow(pl, &link_state);
+ * the PHY flow control bits. */
+ link_state.pause = pl->phy_state.pause;
+ phylink_apply_manual_flow(pl, &link_state);
phylink_mac_config(pl, &link_state);
}
break;
@@ -705,15 +733,18 @@ static void phylink_phy_change(struct phy_device *phydev, bool up,
bool do_carrier)
{
struct phylink *pl = phydev->phylink;
+ bool tx_pause, rx_pause;
+
+ phy_get_pause(phydev, &tx_pause, &rx_pause);
mutex_lock(&pl->state_mutex);
pl->phy_state.speed = phydev->speed;
pl->phy_state.duplex = phydev->duplex;
pl->phy_state.pause = MLO_PAUSE_NONE;
- if (phydev->pause)
- pl->phy_state.pause |= MLO_PAUSE_SYM;
- if (phydev->asym_pause)
- pl->phy_state.pause |= MLO_PAUSE_ASYM;
+ if (tx_pause)
+ pl->phy_state.pause |= MLO_PAUSE_TX;
+ if (rx_pause)
+ pl->phy_state.pause |= MLO_PAUSE_RX;
pl->phy_state.interface = phydev->interface;
pl->phy_state.link = up;
mutex_unlock(&pl->state_mutex);
@@ -777,6 +808,9 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
mutex_lock(&pl->state_mutex);
pl->phydev = phy;
pl->phy_state.interface = interface;
+ pl->phy_state.pause = MLO_PAUSE_NONE;
+ pl->phy_state.speed = SPEED_UNKNOWN;
+ pl->phy_state.duplex = DUPLEX_UNKNOWN;
linkmode_copy(pl->supported, supported);
linkmode_copy(pl->link_config.advertising, config.advertising);
@@ -1006,8 +1040,7 @@ void phylink_start(struct phylink *pl)
* a fixed-link to start with the correct parameters, and also
* ensures that we set the appropriate advertisement for Serdes links.
*/
- phylink_resolve_flow(pl, &pl->link_config);
- phylink_mac_config(pl, &pl->link_config);
+ phylink_mac_initial_config(pl);
/* Restart autonegotiation if using 802.3z to ensure that the link
* parameters are properly negotiated. This is necessary for DSA
@@ -1373,6 +1406,9 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
ASSERT_RTNL();
+ if (pl->cur_link_an_mode == MLO_AN_FIXED)
+ return -EOPNOTSUPP;
+
if (!phylink_test(pl->supported, Pause) &&
!phylink_test(pl->supported, Asym_Pause))
return -EOPNOTSUPP;
@@ -1381,8 +1417,8 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
!pause->autoneg && pause->rx_pause != pause->tx_pause)
return -EINVAL;
- config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
-
+ mutex_lock(&pl->state_mutex);
+ config->pause = 0;
if (pause->autoneg)
config->pause |= MLO_PAUSE_AN;
if (pause->rx_pause)
@@ -1390,6 +1426,22 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
if (pause->tx_pause)
config->pause |= MLO_PAUSE_TX;
+ /*
+ * See the comments for linkmode_set_pause(), wrt the deficiencies
+ * with the current implementation. A solution to this issue would
+ * be:
+ * ethtool Local device
+ * rx tx Pause AsymDir
+ * 0 0 0 0
+ * 1 0 1 1
+ * 0 1 0 1
+ * 1 1 1 1
+ * and then use the ethtool rx/tx enablement status to mask the
+ * rx/tx pause resolution.
+ */
+ linkmode_set_pause(config->advertising, pause->tx_pause,
+ pause->rx_pause);
+
/* If we have a PHY, phylib will call our link state function if the
* mode has changed, which will trigger a resolve and update the MAC
* configuration.
@@ -1399,19 +1451,10 @@ int phylink_ethtool_set_pauseparam(struct phylink *pl,
pause->tx_pause);
} else if (!test_bit(PHYLINK_DISABLE_STOPPED,
&pl->phylink_disable_state)) {
- switch (pl->cur_link_an_mode) {
- 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_INBAND:
- phylink_mac_config(pl, config);
- phylink_mac_an_restart(pl);
- break;
- }
+ phylink_mac_config(pl, &pl->link_config);
+ phylink_mac_an_restart(pl);
}
+ mutex_unlock(&pl->state_mutex);
return 0;
}
@@ -1503,13 +1546,14 @@ static int phylink_mii_emul_read(unsigned int reg,
struct phylink_link_state *state)
{
struct fixed_phy_status fs;
+ unsigned long *lpa = state->lp_advertising;
int val;
fs.link = state->link;
fs.speed = state->speed;
fs.duplex = state->duplex;
- fs.pause = state->pause & MLO_PAUSE_SYM;
- fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
+ fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
+ fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
val = swphy_read_reg(reg, &fs);
if (reg == MII_BMSR) {
@@ -1814,7 +1858,7 @@ static int phylink_sfp_config(struct phylink *pl, u8 mode,
if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
&pl->phylink_disable_state))
- phylink_mac_config(pl, &pl->link_config);
+ phylink_mac_initial_config(pl);
return ret;
}
diff --git a/include/linux/linkmode.h b/include/linux/linkmode.h
index fe740031339d..c664c27a29a0 100644
--- a/include/linux/linkmode.h
+++ b/include/linux/linkmode.h
@@ -71,7 +71,7 @@ static inline void linkmode_change_bit(int nr, volatile unsigned long *addr)
__change_bit(nr, addr);
}
-static inline int linkmode_test_bit(int nr, volatile unsigned long *addr)
+static inline int linkmode_test_bit(int nr, const volatile unsigned long *addr)
{
return test_bit(nr, addr);
}
@@ -88,4 +88,10 @@ static inline int linkmode_subset(const unsigned long *src1,
return bitmap_subset(src1, src2, __ETHTOOL_LINK_MODE_MASK_NBITS);
}
+void linkmode_resolve_pause(const unsigned long *local_adv,
+ const unsigned long *partner_adv,
+ bool *tx_pause, bool *rx_pause);
+
+void linkmode_set_pause(unsigned long *advertisement, bool tx, bool rx);
+
#endif /* __LINKMODE_H */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index c570e162e05e..80f8b2158271 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1257,6 +1257,9 @@ void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx,
void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx);
bool phy_validate_pause(struct phy_device *phydev,
struct ethtool_pauseparam *pp);
+void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause);
+void phy_resolve_pause(unsigned long *local_adv, unsigned long *partner_adv,
+ bool *tx_pause, bool *rx_pause);
int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
int (*run)(struct phy_device *));
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 523209e70947..812357c03df4 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -12,12 +12,10 @@ struct net_device;
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_RX = BIT(0),
+ MLO_PAUSE_TX = BIT(1),
MLO_PAUSE_TXRX_MASK = MLO_PAUSE_TX | MLO_PAUSE_RX,
- MLO_PAUSE_AN = BIT(4),
+ MLO_PAUSE_AN = BIT(2),
MLO_AN_PHY = 0, /* Conventional PHY */
MLO_AN_FIXED, /* Fixed-link mode */
@@ -154,13 +152,20 @@ void mac_pcs_get_state(struct phylink_config *config,
* guaranteed to be correct, and so any mac_config() implementation must
* never reference these fields.
*
+ * In all negotiation modes, as defined by @mode, @state->pause indicates the
+ * pause settings which should be applied as follows. If %MLO_PAUSE_AN is not
+ * set, %MLO_PAUSE_TX and %MLO_PAUSE_RX indicate whether the MAC should send
+ * pause frames and/or act on received pause frames respectively. Otherwise,
+ * the results of in-band negotiation/status from the MAC PCS should be used
+ * to control the MAC pause mode settings.
+ *
* The action performed depends on the currently selected mode:
*
* %MLO_AN_FIXED, %MLO_AN_PHY:
- * Configure the specified @state->speed, @state->duplex and
- * @state->pause (%MLO_PAUSE_TX / %MLO_PAUSE_RX) modes over a link
- * specified by @state->interface. @state->advertising may be used,
- * but is not required. Other members of @state must be ignored.
+ * Configure the specified @state->speed and @state->duplex over a link
+ * specified by @state->interface. @state->advertising may be used, but
+ * is not required. Pause modes as above. Other members of @state must
+ * be ignored.
*
* Valid state members: interface, speed, duplex, pause, advertising.
*
@@ -172,11 +177,14 @@ void mac_pcs_get_state(struct phylink_config *config,
* mac_pcs_get_state() callback. Changes in link state must be made
* by calling phylink_mac_change().
*
+ * Interface mode specific details are mentioned below.
+ *
* If in 802.3z mode, the link speed is fixed, dependent on the
- * @state->interface. Duplex is negotiated, and pause is advertised
- * according to @state->an_enabled, @state->pause and
- * @state->advertising flags. Beware of MACs which only support full
- * duplex at gigabit and higher speeds.
+ * @state->interface. Duplex and pause modes are negotiated via
+ * the in-band configuration word. Advertised pause modes are set
+ * according to the @state->an_enabled and @state->advertising
+ * flags. Beware of MACs which only support full duplex at gigabit
+ * and higher speeds.
*
* If in Cisco SGMII mode, the link speed and duplex mode are passed
* in the serial bitstream 16-bit configuration word, and the MAC
generated by cgit (git 2.34.1) at 2025-12-31 01:24:38 +0000