Date:   Mon, 14 Nov 2016 10:29:15 +0100
From:   "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
To:     <netdev@...r.kernel.org>
CC:     <andrew@...n.ch>, <raju.lakkaraju@...rosemi.com>,
        <allan.nielsen@...rosemi.com>
Subject: [PATCH net-next v2 0/5] Adding PHY-Tunables and downshift support

Hi,

This is a follow-up on the patch series posted at Fri, 4 Nov 2016 10:55:25
+0100 (old cover letter included below).

The following is changed/added/addressed:
- Support for __ethtool_get_strings()/phy_tunables is added
- Using DOWNSHIFT_DEV_DISABLE define instead of '0' when disabling
- If downshifting clould not be eanbled with the requested count, then a
  trace message with a hist is printed.
- Using ERANGE as requested by Andrew.
- Andrew suggested to use ENOSUPP when a tunable is not implemented We kept
  the EINVAL because ENOSUPP does not exists, and the existing MAC-level
  tunable is also using EINVAL in the same scenario.
- Andrew suggested that the driver should accept a count of 1 and "just"
  round it up to 2 (the nearest allowed value). We discussed it a bit (Raju
  and I) and preferred to return EINVAL when a configuration value could
  not be accommodated. People which wants "help" to choose a supported
  value should be using the DOWNSHIFT_DEV_DEFAULT_COUNT value.
- (ethtool) Syntax is changed from "--set-phy-tunable downshift on|off|%d"
  to "--set-phy-tunable [downshift on|off [count N]]" - as requested by
  Andrew.

Ethtool patches will follow shortly.

Please review

Best regards
Allan and Raju


Raju Lakkaraju (5):
  ethtool: (uapi) Add ETHTOOL_PHY_GTUNABLE and ETHTOOL_PHY_STUNABLE
  ethtool: Implements ETHTOOL_PHY_GTUNABLE/ETHTOOL_PHY_STUNABLE
  ethtool: (uapi) Add ETHTOOL_PHY_DOWNSHIFT to PHY tunables
  ethtool: Core impl for ETHTOOL_PHY_DOWNSHIFT tunable
  net: phy: Add downshift get/set support in Microsemi PHYs driver

 drivers/net/phy/mscc.c       | 100 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/phy.h          |   7 +++
 include/uapi/linux/ethtool.h |  18 +++++++-
 net/core/ethtool.c           |  93 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 217 insertions(+), 1 deletion(-)

-- 
2.7.3


Old cover letter:
> From 1a318266822f5d74c58b5219ebbdf5a6a5f567dc Mon Sep 17 00:00:00 2001
> From: "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
> Date: Fri, 4 Nov 2016 10:55:25 +0100
> Subject: [PATCH net-next 0/5] Adding PHY-Tunables and downshift support
> 
> Hi All,
> 
> This series add support for PHY tunables, and uses this facility to configure
> downshifting. The downshifting mechanism is implemented for MSCC phys.
> 
> This series tries to address the comments provided back in mid October when this
> feature was posted along with fast-link-failure. Fast-link-failure has been
> separated out, but we would like to pick continue on that if/when we agree on
> how the phy-tunables and downshifting should be done.
> 
> The proposed generic interface is similar to ETHTOOL_GTUNABLE/ETHTOOL_STUNABLE,
> it uses the same type (ethtool_tunable/tunable_type_id) but a new enum
> (phy_tunable_id) is added to reflect the PHY tunable.
> 
> The implementation just call the newly added function pointers in
> get_tunable/set_tunable phy_device structure.
> 
> To configure downshifting, the ethtool_tunable structure is used. 'id' must be
> set to 'ETHTOOL_PHY_DOWNSHIFT', 'type_id' must be set to 'ETHTOOL_TUNABLE_U8'
> and 'data' value configure the amount of downshift re-tries.
> 
> If configured to DOWNSHIFT_DEV_DISABLE, then downshift is disabled
> If configured to DOWNSHIFT_DEV_DEFAULT_COUNT, then it is up to the device to
> choose a device-specific re-try count.
> 
> Patches to implement this in ethtool will follow in a few minutes.

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