From: Ido Schimmel <ido...@nvidia.com> Danielle says:
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 adjusts ethtool to dump to user space the number of lanes currently in use. Patches #3-#5 add support for lanes configuration in mlxsw. Patch #6 adds a selftest. Danielle Ratson (6): ethtool: Extend link modes settings uAPI with lanes 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: Expose the number of lanes in use net: selftests: Add lanes setting test Documentation/networking/ethtool-netlink.rst | 16 +- .../net/ethernet/mellanox/mlxsw/spectrum.h | 13 +- .../mellanox/mlxsw/spectrum_ethtool.c | 156 ++++++++---- include/linux/ethtool.h | 4 + include/uapi/linux/ethtool.h | 8 + include/uapi/linux/ethtool_netlink.h | 1 + net/ethtool/linkmodes.c | 232 +++++++++++------- net/ethtool/netlink.h | 2 +- .../selftests/net/forwarding/ethtool_lanes.sh | 224 +++++++++++++++++ .../selftests/net/forwarding/ethtool_lib.sh | 34 +++ tools/testing/selftests/net/forwarding/lib.sh | 28 +++ 11 files changed, 571 insertions(+), 147 deletions(-) create mode 100755 tools/testing/selftests/net/forwarding/ethtool_lanes.sh -- 2.26.2
