linux/Documentation
Danielle Ratson 012ce4dd31 ethtool: Extend link modes settings uAPI with lanes
Currently, when auto negotiation is on, the user can advertise all the
linkmodes which correspond to a specific speed, but does not have a
similar selector for the number of lanes. This is significant when a
specific speed can be achieved using different number of lanes.  For
example, 2x50 or 4x25.

Add 'ETHTOOL_A_LINKMODES_LANES' attribute and expand 'struct
ethtool_link_settings' with lanes field in order to implement a new
lanes-selector that will enable the user to advertise a specific number
of lanes as well.

When auto negotiation is off, lanes parameter can be forced only if the
driver supports it. Add a capability bit in 'struct ethtool_ops' that
allows ethtool know if the driver can handle the lanes parameter when
auto negotiation is off, so if it does not, an error message will be
returned when trying to set lanes.

Example:

$ ethtool -s swp1 lanes 4
$ ethtool swp1
  Settings for swp1:
	Supported ports: [ FIBRE ]
        Supported link modes:   1000baseKX/Full
                                10000baseKR/Full
                                40000baseCR4/Full
				40000baseSR4/Full
				40000baseLR4/Full
                                25000baseCR/Full
                                25000baseSR/Full
				50000baseCR2/Full
                                100000baseSR4/Full
				100000baseCR4/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  40000baseCR4/Full
				40000baseSR4/Full
				40000baseLR4/Full
                                100000baseSR4/Full
				100000baseCR4/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: Unknown!
        Duplex: Unknown! (255)
        Auto-negotiation: on
        Port: Direct Attach Copper
        PHYAD: 0
        Transceiver: internal
        Link detected: no

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-03 18:37:28 -08:00
..
ABI net: dsa: allow changing the tag protocol via the "tagging" device attribute 2021-01-29 21:24:39 -08:00
accounting
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arm ARM updates for 5.11: 2020-12-22 13:34:27 -08:00
arm64 ARM: 2020-12-20 10:44:05 -08:00
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dev-tools kasan: fix HW_TAGS boot parameters 2021-01-24 10:34:52 -08:00
devicetree Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-02-02 14:21:31 -08:00
doc-guide Documentation: doc-guide: fixes to sphinx.rst 2020-12-31 15:49:51 -07:00
driver-api devlink: Extend devlink port documentation for subfunctions 2021-01-22 11:32:11 -08:00
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fpga
gpu drm/docs: Fix todo.rst 2020-11-18 11:51:58 +01:00
hid Merge branch 'for-5.11/core' into for-linus 2020-12-16 11:38:38 +01:00
hwmon hwmon: (sbtsi_temp) Fix Documenation kernel-doc warning 2020-12-30 08:05:20 -08:00
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locking Documentation: seqlock: s/LOCKTYPE/LOCKNAME/g 2020-12-09 17:08:49 +01:00
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mips docs: archis: add a per-architecture features list 2020-12-03 15:10:15 -07:00
misc-devices
netlabel
networking ethtool: Extend link modes settings uAPI with lanes 2021-02-03 18:37:28 -08:00
nios2 docs: nios2: add missing ReST file 2020-12-07 08:35:21 -07:00
nvdimm
openrisc docs: archis: add a per-architecture features list 2020-12-03 15:10:15 -07:00
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PCI
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riscv docs: archis: add a per-architecture features list 2020-12-03 15:10:15 -07:00
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usb
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virt KVM: Documentation: Update description of KVM_{GET,CLEAR}_DIRTY_LOG 2021-01-25 18:52:08 -05:00
vm mm/lru: revise the comments of lru_lock 2020-12-15 14:48:04 -08:00
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x86 A much quieter cycle for documentation (happily), with, one hopes, the bulk 2020-12-14 16:55:54 -08:00
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