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Date: Fri, 30 Sep 2022 16:21:01 +0200
From: Marek Behún <kabel@...nel.org>
To: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Russell King <rmk+kernel@...linux.org.uk>,
Andrew Lunn <andrew@...n.ch>,
Vladimir Oltean <vladimir.oltean@....com>,
Marek Behún <kabel@...nel.org>
Subject: [PATCH net-next 03/12] net: phylink: use phy_interface_t bitmaps for optical modules
From: Russell King <rmk+kernel@...linux.org.uk>
Where a MAC provides a phy_interface_t bitmap, use these bitmaps to
select the operating interface mode for optical SFP modules, rather
than using the linkmode bitmaps.
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Marek Behún <kabel@...nel.org>
---
drivers/net/phy/phylink.c | 164 +++++++++++++++++++++++++++++++-------
1 file changed, 134 insertions(+), 30 deletions(-)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index b76bf8df83ff..ab32ef767d69 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2803,6 +2803,70 @@ static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
pl->netdev->sfp_bus = NULL;
}
+static const phy_interface_t phylink_sfp_interface_preference[] = {
+ PHY_INTERFACE_MODE_25GBASER,
+ PHY_INTERFACE_MODE_USXGMII,
+ PHY_INTERFACE_MODE_10GBASER,
+ PHY_INTERFACE_MODE_5GBASER,
+ PHY_INTERFACE_MODE_2500BASEX,
+ PHY_INTERFACE_MODE_SGMII,
+ PHY_INTERFACE_MODE_1000BASEX,
+ PHY_INTERFACE_MODE_100BASEX,
+};
+
+static phy_interface_t phylink_choose_sfp_interface(struct phylink *pl,
+ const unsigned long *intf)
+{
+ phy_interface_t interface;
+ size_t i;
+
+ interface = PHY_INTERFACE_MODE_NA;
+ for (i = 0; i < ARRAY_SIZE(phylink_sfp_interface_preference); i++)
+ if (test_bit(phylink_sfp_interface_preference[i], intf)) {
+ interface = phylink_sfp_interface_preference[i];
+ break;
+ }
+
+ return interface;
+}
+
+static void phylink_sfp_set_config(struct phylink *pl, u8 mode,
+ unsigned long *supported,
+ struct phylink_link_state *state)
+{
+ bool changed = false;
+
+ phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
+ phylink_an_mode_str(mode), phy_modes(state->interface),
+ __ETHTOOL_LINK_MODE_MASK_NBITS, supported);
+
+ if (!linkmode_equal(pl->supported, supported)) {
+ linkmode_copy(pl->supported, supported);
+ changed = true;
+ }
+
+ if (!linkmode_equal(pl->link_config.advertising, state->advertising)) {
+ linkmode_copy(pl->link_config.advertising, state->advertising);
+ changed = true;
+ }
+
+ if (pl->cur_link_an_mode != mode ||
+ pl->link_config.interface != state->interface) {
+ pl->cur_link_an_mode = mode;
+ pl->link_config.interface = state->interface;
+
+ changed = true;
+
+ phylink_info(pl, "switched to %s/%s link mode\n",
+ phylink_an_mode_str(mode),
+ phy_modes(state->interface));
+ }
+
+ if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
+ &pl->phylink_disable_state))
+ phylink_mac_initial_config(pl, false);
+}
+
static int phylink_sfp_config(struct phylink *pl, u8 mode,
const unsigned long *supported,
const unsigned long *advertising)
@@ -2811,7 +2875,6 @@ static int phylink_sfp_config(struct phylink *pl, u8 mode,
__ETHTOOL_DECLARE_LINK_MODE_MASK(support);
struct phylink_link_state config;
phy_interface_t iface;
- bool changed;
int ret;
linkmode_copy(support, supported);
@@ -2854,61 +2917,103 @@ static int phylink_sfp_config(struct phylink *pl, u8 mode,
return ret;
}
- phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
- phylink_an_mode_str(mode), phy_modes(config.interface),
- __ETHTOOL_LINK_MODE_MASK_NBITS, support);
-
if (phy_interface_mode_is_8023z(iface) && pl->phydev)
return -EINVAL;
- changed = !linkmode_equal(pl->supported, support) ||
- !linkmode_equal(pl->link_config.advertising,
- config.advertising);
- if (changed) {
- linkmode_copy(pl->supported, support);
- linkmode_copy(pl->link_config.advertising, config.advertising);
+ pl->link_port = pl->sfp_port;
+
+ phylink_sfp_set_config(pl, mode, support, &config);
+
+ return 0;
+}
+
+static int phylink_sfp_config_optical(struct phylink *pl)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
+ DECLARE_PHY_INTERFACE_MASK(interfaces);
+ struct phylink_link_state config;
+ phy_interface_t interface;
+ int ret;
+
+ phylink_dbg(pl, "optical SFP: interfaces=[mac=%*pbl, sfp=%*pbl]\n",
+ (int)PHY_INTERFACE_MODE_MAX,
+ pl->config->supported_interfaces,
+ (int)PHY_INTERFACE_MODE_MAX,
+ pl->sfp_interfaces);
+
+ /* Find the union of the supported interfaces by the PCS/MAC and
+ * the SFP module.
+ */
+ phy_interface_and(interfaces, pl->config->supported_interfaces,
+ pl->sfp_interfaces);
+ if (phy_interface_empty(interfaces)) {
+ phylink_err(pl, "unsupported SFP module: no common interface modes\n");
+ return -EINVAL;
}
- if (pl->cur_link_an_mode != mode ||
- pl->link_config.interface != config.interface) {
- pl->link_config.interface = config.interface;
- pl->cur_link_an_mode = mode;
+ memset(&config, 0, sizeof(config));
+ linkmode_copy(support, pl->sfp_support);
+ linkmode_copy(config.advertising, pl->sfp_support);
+ config.speed = SPEED_UNKNOWN;
+ config.duplex = DUPLEX_UNKNOWN;
+ config.pause = MLO_PAUSE_AN;
+ config.an_enabled = true;
- changed = true;
+ /* For all the interfaces that are supported, reduce the sfp_support
+ * mask to only those link modes that can be supported.
+ */
+ ret = phylink_validate_mask(pl, pl->sfp_support, &config, interfaces);
+ if (ret) {
+ phylink_err(pl, "unsupported SFP module: validation with support %*pb failed\n",
+ __ETHTOOL_LINK_MODE_MASK_NBITS, support);
+ return ret;
+ }
- phylink_info(pl, "switched to %s/%s link mode\n",
- phylink_an_mode_str(mode),
- phy_modes(config.interface));
+ interface = phylink_choose_sfp_interface(pl, interfaces);
+ if (interface == PHY_INTERFACE_MODE_NA) {
+ phylink_err(pl, "failed to select SFP interface\n");
+ return -EINVAL;
+ }
+
+ phylink_dbg(pl, "optical SFP: chosen %s interface\n",
+ phy_modes(interface));
+
+ config.interface = interface;
+
+ /* Ignore errors if we're expecting a PHY to attach later */
+ ret = phylink_validate(pl, support, &config);
+ if (ret) {
+ phylink_err(pl, "validation with support %*pb failed: %pe\n",
+ __ETHTOOL_LINK_MODE_MASK_NBITS, support,
+ ERR_PTR(ret));
+ return ret;
}
pl->link_port = pl->sfp_port;
- if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
- &pl->phylink_disable_state))
- phylink_mac_initial_config(pl, false);
+ phylink_sfp_set_config(pl, MLO_AN_INBAND, pl->sfp_support, &config);
- return ret;
+ return 0;
}
static int phylink_sfp_module_insert(void *upstream,
const struct sfp_eeprom_id *id)
{
struct phylink *pl = upstream;
- unsigned long *support = pl->sfp_support;
ASSERT_RTNL();
- linkmode_zero(support);
+ linkmode_zero(pl->sfp_support);
phy_interface_zero(pl->sfp_interfaces);
- sfp_parse_support(pl->sfp_bus, id, support, pl->sfp_interfaces);
- pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
+ sfp_parse_support(pl->sfp_bus, id, pl->sfp_support, pl->sfp_interfaces);
+ pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, pl->sfp_support);
/* If this module may have a PHY connecting later, defer until later */
pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
if (pl->sfp_may_have_phy)
return 0;
- return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
+ return phylink_sfp_config_optical(pl);
}
static int phylink_sfp_module_start(void *upstream)
@@ -2927,8 +3032,7 @@ static int phylink_sfp_module_start(void *upstream)
if (!pl->sfp_may_have_phy)
return 0;
- return phylink_sfp_config(pl, MLO_AN_INBAND,
- pl->sfp_support, pl->sfp_support);
+ return phylink_sfp_config_optical(pl);
}
static void phylink_sfp_module_stop(void *upstream)
--
2.35.1
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