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From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Thu, 24 Sep 2015 11:01:13 +0100
Subject: [PATCH] phylink: add hooks for SFP support
Add support to phylink for SFP, which needs to control and configure
the ethernet MAC link state. Specifically, SFP needs to:
1. set the negotiation mode between SGMII and 1000base-X
2. attach and detach the module PHY
3. prevent the link coming up when errors are reported
In the absence of a PHY, we also need to set the ethtool port type
according to the module plugged in.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
- rework phylink_set_link_*(), combining into a single function.
---
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -11,6 +11,7 @@
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/gpio/consumer.h>
+#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
@@ -29,11 +30,16 @@
(ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
+static LIST_HEAD(phylinks);
+static DEFINE_MUTEX(phylink_mutex);
+
enum {
PHYLINK_DISABLE_STOPPED,
+ PHYLINK_DISABLE_LINK,
};
struct phylink {
+ struct list_head node;
struct net_device *netdev;
const struct phylink_mac_ops *ops;
struct mutex config_mutex;
@@ -375,12 +381,20 @@ struct phylink *phylink_create(struct ne
phylink_init_advert(pl, pl->link_an_mode, pl->supported,
pl->link_config.advertising);
+ mutex_lock(&phylink_mutex);
+ list_add_tail(&pl->node, &phylinks);
+ mutex_unlock(&phylink_mutex);
+
return pl;
}
EXPORT_SYMBOL_GPL(phylink_create);
void phylink_destroy(struct phylink *pl)
{
+ mutex_lock(&phylink_mutex);
+ list_del(&pl->node);
+ mutex_unlock(&phylink_mutex);
+
cancel_work_sync(&pl->resolve);
kfree(pl);
}
@@ -900,4 +914,93 @@ int phylink_mii_ioctl(struct phylink *pl
}
EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
+
+
+void phylink_disable(struct phylink *pl)
+{
+ set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
+ flush_work(&pl->resolve);
+
+ netif_carrier_off(pl->netdev);
+}
+EXPORT_SYMBOL_GPL(phylink_disable);
+
+void phylink_enable(struct phylink *pl)
+{
+ clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
+ phylink_run_resolve(pl);
+}
+EXPORT_SYMBOL_GPL(phylink_enable);
+
+int phylink_set_link(struct phylink *pl, unsigned int mode, u8 port,
+ const unsigned long *support)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
+ int ret = 0;
+
+ netdev_dbg(pl->netdev, "requesting link mode %s with support %*pb\n",
+ phylink_an_mode_str(mode),
+ __ETHTOOL_LINK_MODE_MASK_NBITS, support);
+
+ if (mode == MLO_AN_FIXED)
+ return -EINVAL;
+
+ linkmode_copy(mask, support);
+
+ /* Ignore errors if we're expecting a PHY to attach later */
+ ret = phylink_validate_support(pl, mode, mask);
+ if (ret && mode != MLO_AN_PHY)
+ return ret;
+
+ mutex_lock(&pl->config_mutex);
+ if (mode == MLO_AN_8023Z && pl->phydev) {
+ ret = -EINVAL;
+ } else {
+ bool changed = !bitmap_equal(pl->supported, mask,
+ __ETHTOOL_LINK_MODE_MASK_NBITS);
+ if (changed) {
+ linkmode_copy(pl->supported, mask);
+
+ phylink_init_advert(pl, mode, mask,
+ pl->link_config.advertising);
+ }
+
+ if (pl->link_an_mode != mode) {
+ pl->link_an_mode = mode;
+
+ changed = true;
+
+ netdev_info(pl->netdev, "switched to %s link mode\n",
+ phylink_an_mode_str(mode));
+ }
+
+ pl->link_port = port;
+
+ if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
+ &pl->phylink_disable_state))
+ phylink_mac_config(pl, &pl->link_config);
+ }
+ mutex_unlock(&pl->config_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(phylink_set_link);
+
+struct phylink *phylink_lookup_by_netdev(struct net_device *ndev)
+{
+ struct phylink *pl, *found = NULL;
+
+ mutex_lock(&phylink_mutex);
+ list_for_each_entry(pl, &phylinks, node)
+ if (pl->netdev == ndev) {
+ found = pl;
+ break;
+ }
+
+ mutex_unlock(&phylink_mutex);
+
+ return found;
+}
+EXPORT_SYMBOL_GPL(phylink_lookup_by_netdev);
+
MODULE_LICENSE("GPL");
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -88,6 +88,12 @@ int phylink_ethtool_ksettings_set(struct
const struct ethtool_link_ksettings *);
int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
+int phylink_set_link(struct phylink *pl, unsigned int mode, u8 port,
+ const unsigned long *support);
+void phylink_disable(struct phylink *pl);
+void phylink_enable(struct phylink *pl);
+struct phylink *phylink_lookup_by_netdev(struct net_device *ndev);
+
#define phylink_zero(bm) \
bitmap_zero(bm, __ETHTOOL_LINK_MODE_MASK_NBITS)
#define __phylink_do_bit(op, bm, mode) \
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