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Date:   Thu, 17 Dec 2020 10:57:10 +0200
From:   Danielle Ratson <>
        Danielle Ratson <>
Subject: [PATCH net-next v2 0/7] Support setting lanes via ethtool

From: Danielle Ratson <>

Some speeds can be achieved with different number of lanes. For example,
100Gbps can be achieved using two lanes of 50Gbps or four lanes of
25Gbps. This patch set adds a new selector that allows ethtool to
advertise link modes according to their number of lanes and also force a
specific number of lanes when autonegotiation is off.

Advertising all link modes with a speed of 100Gbps that use two lanes:

# ethtool -s swp1 speed 100000 lanes 2 autoneg on

Forcing a speed of 100Gbps using four lanes:

# ethtool -s swp1 speed 100000 lanes 4 autoneg off

Patch set overview:

Patch #1 allows user space to configure the desired number of lanes.

Patch #2-#3 adjusts ethtool to dump to user space the number of lanes
currently in use.

Patches #4-#6 add support for lanes configuration in mlxsw.

Patch #7 adds a selftest.

	* Patch #1:Remove ETHTOOL_LANES defines and simply use a number
	* Patches #2,#6: Pass link mode from driver to ethtool instead of
	  the parameters themselves.
	* Patch #5: Add an actual width field for spectrum-2 link modes
	  in order to set the suitable link mode when lanes parameter is
	* Patch #6: Changed lanes to be unsigned in
	  'struct link_mode_info'.
	* Patch #7: Remove the test for recieving max_width when lanes is
	  not set by user. When not setting lanes, we don't promise
	  anything regarding what number of lanes will be chosen.

Danielle Ratson (7):
  ethtool: Extend link modes settings uAPI with lanes
  ethtool: Get link mode in use instead of speed and duplex parameters
  ethtool: Expose the number of lanes in use
  mlxsw: ethtool: Remove max lanes filtering
  mlxsw: ethtool: Add support for setting lanes when autoneg is off
  mlxsw: ethtool: Pass link mode in use to ethtool
  net: selftests: Add lanes setting test

 Documentation/networking/ethtool-netlink.rst  |  12 +-
 .../net/ethernet/mellanox/mlxsw/spectrum.h    |  13 +-
 .../mellanox/mlxsw/spectrum_ethtool.c         | 168 +++++----
 include/linux/ethtool.h                       |   5 +
 include/uapi/linux/ethtool.h                  |   4 +
 include/uapi/linux/ethtool_netlink.h          |   1 +
 net/ethtool/linkmodes.c                       | 321 +++++++++++-------
 net/ethtool/netlink.h                         |   2 +-
 .../selftests/net/forwarding/ | 186 ++++++++++
 .../selftests/net/forwarding/   |  34 ++
 tools/testing/selftests/net/forwarding/ |  28 ++
 11 files changed, 570 insertions(+), 204 deletions(-)
 create mode 100755 tools/testing/selftests/net/forwarding/


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