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Michael Sit Wei Hong says:
====================
Introducing support for DWC xpcs Energy Efficient Ethernet
The goal of this patch set is to enable EEE in the xpcs so that when
EEE is enabled, the MAC-->xpcs-->PHY have all the EEE related
configurations enabled.
Patch 1 adds the functions to enable EEE in the xpcs and sets it to
transparent mode.
Patch 2 adds the callbacks to configure the xpcs EEE mode.
The results are tested by checking the lpi counters of the tx and rx
path of the interface. When EEE is enabled, the lpi counters should
increament as it enters and exits lpi states.
host@EHL$ ethtool --show-eee enp0s30f4
EEE Settings for enp0s30f4:
EEE status: disabled
Tx LPI: disabled
Supported EEE link modes: 100baseT/Full
1000baseT/Full
Advertised EEE link modes: Not reported
Link partner advertised EEE link modes: 100baseT/Full
1000baseT/Full
host@EHL$ ethtool -S enp0s30f4 | grep lpi
irq_tx_path_in_lpi_mode_n: 0
irq_tx_path_exit_lpi_mode_n: 0
irq_rx_path_in_lpi_mode_n: 0
irq_rx_path_exit_lpi_mode_n: 0
host@EHL$ ethtool --set-eee enp0s30f4 eee on
host@EHL$ [ 110.265154] intel-eth-pci 0000:00:1e.4 enp0s30f4: Link is Down
[ 112.315155] intel-eth-pci 0000:00:1e.4 enp0s30f4: Link is Up - 1Gbps/Full - flow control off
[ 112.324612] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s30f4: link becomes ready
host@EHL$ ethtool --show-eee enp0s30f4
EEE Settings for enp0s30f4:
EEE status: enabled - active
Tx LPI: 1000000 (us)
Supported EEE link modes: 100baseT/Full
1000baseT/Full
Advertised EEE link modes: 100baseT/Full
1000baseT/Full
Link partner advertised EEE link modes: 100baseT/Full
1000baseT/Full
host@EHL$ ethtool -S enp0s30f4 | grep lpi
irq_tx_path_in_lpi_mode_n: 6
irq_tx_path_exit_lpi_mode_n: 5
irq_rx_path_in_lpi_mode_n: 7
irq_rx_path_exit_lpi_mode_n: 6
host@EHL$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.02 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.510 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.489 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.484 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=0.504 ms
64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=0.466 ms
64 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=0.529 ms
64 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=0.519 ms
64 bytes from 192.168.1.1: icmp_seq=9 ttl=64 time=0.518 ms
64 bytes from 192.168.1.1: icmp_seq=10 ttl=64 time=0.501 ms
--- 192.168.1.1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9216ms
rtt min/avg/max/mdev = 0.466/0.553/1.018/0.155 ms
host@EHL$ ethtool -S enp0s30f4 | grep lpi
irq_tx_path_in_lpi_mode_n: 22
irq_tx_path_exit_lpi_mode_n: 21
irq_rx_path_in_lpi_mode_n: 21
irq_rx_path_exit_lpi_mode_n: 20
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.