Merge branch 'Pause-updates-for-phylib-and-phylink'
Russell King says:
====================
Pause updates for phylib and phylink
Currently, phylib resolves the speed and duplex settings, which MAC
drivers use directly. phylib also extracts the "Pause" and "AsymPause"
bits from the link partner's advertisement, and stores them in struct
phy_device's pause and asym_pause members with no further processing.
It is left up to each MAC driver to implement decoding for this
information.
phylink converted drivers are able to take advantage of code therein
which resolves the pause advertisements for the MAC driver, but this
does nothing for unconverted drivers. It also does not allow us to
make use of hardware-resolved pause states offered by several PHYs.
This series aims to address this by:
1. Providing a generic implementation, linkmode_resolve_pause(), that
takes the ethtool linkmode arrays for the link partner and local
advertisements, decoding the result to whether pause frames should
be allowed to be transmitted or received and acted upon. I call
this the pause enablement state.
2. Providing a phylib implementation, phy_get_pause(), which allows
MAC drivers to request the pause enablement state from phylib.
3. Providing a generic linkmode_set_pause() for setting the pause
advertisement according to the ethtool tx/rx flags - note that this
design has some shortcomings, see the comments in the kerneldoc for
this function.
4. Remove the ability in phylink to set the pause states for fixed
links, which brings them into line with how we deal with the speed
and duplex parameters; we can reintroduce this later if anyone
requires it. This could be a userspace-visible change.
5. Split application of manual pause enablement state from phylink's
resolution of the same to allow use of phylib's new phy_get_pause()
interface by phylink, and make that switch.
6. Resolve the fixed-link pause enablement state using the generic
linkmode_resolve_pause() helper introduced earlier. This, in
connection with the previous commits, allows us to kill the
MLO_PAUSE_SYM and MLO_PAUSE_ASYM flags.
7. make phylink's ethtool pause setting implementation update the
pause advertisement in the same way that phylib does, with the
same caveats that are present there (as mentioned above w.r.t
linkmode_set_pause()).
8. create a more accurate initial configuration for MACs, used when
phy_start() is called or a SFP is detected. In particular, this
ensures that the pause bits seen by MAC drivers in state->pause
are accurate for SGMII.
9. finally, update the kerneldoc descriptions for mac_config() for
the above changes.
This series has been build-tested against net-next; the boot tested
patches are in my "phy" branch against v5.5 plus the queued phylink
changes that were merged for 5.6.
The next series will introduce the ability for phylib drivers to
provide hardware resolved pause enablement state. These patches can
be found in my "phy" branch.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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drivers/net/phy/linkmode.c
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