[PATCH net-next v4 0/2] net: phy: fix PHY interface mask initialization and XPCS usage

[Coia Prant <coiaprant@gmail.com>]

This series fixes issues related to the handling of the PHY interface mask
(supported_interfaces) at the core level and in the XPCS driver.

Patch 1 fixes a local macro in the txgbe driver.
DECLARE_PHY_INTERFACE_MASK_ZERO() incorrectly uses PHY_INTERFACE_MODE_MAX
as the array length instead of BITS_TO_LONGS(), which wastes stack space.
Move it to include/linux/phy.h and base it on
DECLARE_PHY_INTERFACE_MASK() so the bitmap is correctly sized while
still being zero-initialized.

Patch 2 makes the XPCS supported_interfaces mask authoritative. The
generic compat table advertises modes that a specific integration may
not support. The Rockchip glue now builds a platform mask (1000BASE-X,
SGMII, QSGMII) and intersects it with the inherited core mask using
phy_interface_and(). In addition, xpcs_find_compat() now checks
supported_interfaces before looking up the compat table, ensuring the
core respects the narrowed mask.

Note: checkpatch.pl reports "Macros with complex values should be
enclosed in parentheses" for the new macro in Patch 1. This is a known
false positive for declarative macros that expand to variable
declarations; wrapping it would break compilation.

Changes since v3:
- Rebased onto net-next as suggested by Paolo.
- Patch 1: drop the Fixes tag, as this is a cleanup/optimization rather
  than a bug fix.
- Patch 2: move DECLARE_PHY_INTERFACE_MASK_ZERO() to the top of the
  function to comply with the reverse Christmas tree order.
- Patch 2: clarify in the commit message that QSGMII is currently a
  no-op because the core does not support it, demonstrating the
  intersection behavior.
---
Coia Prant (2):
  net: phy: move DECLARE_PHY_INTERFACE_MASK_ZERO to core
  net: pcs: xpcs: make supported_interfaces authoritative

 drivers/net/ethernet/wangxun/txgbe/txgbe_type.h |  3 ---
 drivers/net/pcs/pcs-xpcs-rk.c                   | 10 ++++++++++
 drivers/net/pcs/pcs-xpcs.c                      |  3 +++
 include/linux/phy.h                             |  3 +++
 4 files changed, 16 insertions(+), 3 deletions(-)

-- 
2.47.3