In fixed-link setup phylink_parse_fixedlink() unconditionally sets
Pause, Asym_Pause and Autoneg bits to "supported" bitmap, while MAC may
not support these.

This leads to ethtool reporting:

 > Supported pause frame use: Symmetric Receive-only
 > Supports auto-negotiation: Yes

regardless of what is actually supported.

Instead of unconditionally set Pause, Asym_Pause and Autoneg it is
sensible to set them according to validated "supported" bitmap, i.e. the
result of phylink_validate().

Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
---
 drivers/net/phy/phylink.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 2805b04d6402..ba5d3868604b 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -688,6 +688,7 @@ static int phylink_parse_fixedlink(struct phylink *pl,
 				   struct fwnode_handle *fwnode)
 {
 	struct fwnode_handle *fixed_node;
+	bool pause, asym_pause, autoneg;
 	const struct phy_setting *s;
 	struct gpio_desc *desc;
 	u32 speed;
@@ -760,13 +761,23 @@ static int phylink_parse_fixedlink(struct phylink *pl,
 	linkmode_copy(pl->link_config.advertising, pl->supported);
 	phylink_validate(pl, pl->supported, &pl->link_config);
 
+	pause = phylink_test(pl->supported, Pause);
+	asym_pause = phylink_test(pl->supported, Asym_Pause);
+	autoneg = phylink_test(pl->supported, Autoneg);
 	s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 			       pl->supported, true);
 	linkmode_zero(pl->supported);
 	phylink_set(pl->supported, MII);
-	phylink_set(pl->supported, Pause);
-	phylink_set(pl->supported, Asym_Pause);
-	phylink_set(pl->supported, Autoneg);
+
+	if (pause)
+		phylink_set(pl->supported, Pause);
+
+	if (asym_pause)
+		phylink_set(pl->supported, Asym_Pause);
+
+	if (autoneg)
+		phylink_set(pl->supported, Autoneg);
+
 	if (s) {
 		__set_bit(s->bit, pl->supported);
 		__set_bit(s->bit, pl->link_config.lp_advertising);
-- 
2.39.1

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 10 Feb 2023 18:46:27 +0300 you wrote:
> In fixed-link setup phylink_parse_fixedlink() unconditionally sets
> Pause, Asym_Pause and Autoneg bits to "supported" bitmap, while MAC may
> not support these.
> 
> This leads to ethtool reporting:
> 
>  > Supported pause frame use: Symmetric Receive-only
>  > Supports auto-negotiation: Yes
> 
> [...]

Here is the summary with links:
  - [net-next] net: phylink: support validated pause and autoneg in fixed-link
    https://git.kernel.org/netdev/net-next/c/894341ad3ad7

You are awesome, thank you!
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