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net: phy: provide phylib stubs for hardware timestamping operations

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net/core/dev_ioctl.c (built-in code) will want to call phy_mii_ioctl()
for hardware timestamping purposes. This is not directly possible,
because phy_mii_ioctl() is a symbol provided under CONFIG_PHYLIB.

Do something similar to what was done in DSA in commit 5a17818682
("net: dsa: replace NETDEV_PRE_CHANGE_HWTSTAMP notifier with a stub"),
and arrange some indirect calls to phy_mii_ioctl() through a stub
structure containing function pointers, that's provided by phylib as
built-in even when CONFIG_PHYLIB=m, and which phy_init() populates at
runtime (module insertion).

Note: maybe the ownership of the ethtool_phy_ops singleton is backwards,
and the methods exposed by that should be later merged into phylib_stubs.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230801142824.1772134-12-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean
2023-08-01 17:28:23 +03:00
committed by Jakub Kicinski
parent 70ef7d87f6
commit 60495b6622
7 changed files with 141 additions and 0 deletions
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7
include/linux/phy.h
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@@ -298,6 +298,7 @@ static inline const char *phy_modes(phy_interface_t interface)
#define MII_BUS_ID_SIZE 61
struct device;
struct kernel_hwtstamp_config;
struct phylink;
struct sfp_bus;
struct sfp_upstream_ops;
@@ -1955,6 +1956,12 @@ int phy_ethtool_set_plca_cfg(struct phy_device *phydev,
int phy_ethtool_get_plca_status(struct phy_device *phydev,
struct phy_plca_status *plca_st);
int __phy_hwtstamp_get(struct phy_device *phydev,
struct kernel_hwtstamp_config *config);
int __phy_hwtstamp_set(struct phy_device *phydev,
struct kernel_hwtstamp_config *config,
struct netlink_ext_ack *extack);
static inline int phy_package_read(struct phy_device *phydev, u32 regnum)
{
struct phy_package_shared *shared = phydev->shared;