On Thu, May 24, 2018 at 6:54 PM, Andre Ruiz <andre.r...@gmail.com> wrote: > > Alex, > > In fact, sometimes it won't pass traffic at all and sometimes it will work > at 10Mbit/s. I still cannot tell what causes each scenario. The common > aspect is the 10Mbit/Full part. IIRC a failed link speed negotiation will > make it come up at 10Mbit/Half Duplex, right?
No, you can support 10/FULL on a 2 pair link. Half Duplex is more a side effect of being on a hub versus a switch as I recall, though you should also be able to support 100/FULL on a 2 pair link. Normally to get into a 10/half state you would have to end up with autonegotation failing and the hardware trying modes until it links at 10Mbps. Normally if autoneg works it will just link with full duplex at whatever speed it links at assuming the full duplex modes are an option. One thing you might try testing is to reduce the number of advertised modes and see what the part defaults to. So for example you might specify something like "ethtool -s enp0s31f5 advertise 2c". That would limit the interface to 100 and gigabit speeds. One other possibility that I want to eliminate is the Low Power Link Up feature somehow being enabled. That would link at the lowest speed available on the interface in order to save power. So eliminating the 10Mbps options from the advertised modes should force it to link at 100 if that is what is going on. > This behaviour has been the same in all kernels released on fedora 28, the > GA one and all updates at least until 4.16.9-300.fc28.x86_64. > > Right now, it's working at 10Mbit, I have both hybernated and slept the > machine and it still passes traffic. > > [root@thinkpad ~]# ethtool -i enp0s31f6 > driver: e1000e > version: 3.2.6-k > firmware-version: 0.13-4 > expansion-rom-version: > bus-info: 0000:00:1f.6 > supports-statistics: yes > supports-test: yes > supports-eeprom-access: yes > supports-register-dump: yes > supports-priv-flags: no > [root@thinkpad ~]# ethtool enp0s31f6 > Settings for enp0s31f6: > Supported ports: [ TP ] > Supported link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Supported pause frame use: No > Supports auto-negotiation: Yes > Supported FEC modes: Not reported > Advertised link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Advertised pause frame use: No > Advertised auto-negotiation: Yes > Advertised FEC modes: Not reported > Speed: 10Mb/s > Duplex: Full > Port: Twisted Pair > PHYAD: 1 > Transceiver: internal > Auto-negotiation: on > MDI-X: off (auto) > Supports Wake-on: pumbg > Wake-on: g > Current message level: 0x00000007 (7) > drv probe link > Link detected: yes Could you provide any information on what it is you are connecting to? I assume it is is a switch of some sort. If you could provide the make/model it would be useful for us to note that so that we can work on a reproduction on our end and do research into if there might be any known issues with the hardware that make be leading to this behavior. > > After a warm boot (does not need a cold one), it will get 1000Mbit/s. > > The only messages appearing on dmesg at the time of the test are: > > [49914.499713] e1000e: enp0s31f6 NIC Link is Up 10 Mbps Full Duplex, Flow > Control: Rx/Tx > [49914.499723] e1000e 0000:00:1f.6 enp0s31f6: 10/100 speed: disabling TSO > [49914.499837] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s31f6: link becomes ready > > Please tell me if you need any other kind of log or captures. > > Thank you > Andre > Unfortunately it looks like the logs aren't probably going to provide much information. Basically we will just need to poke and prod the link to try and figure out what is going on that is causing it to link at 10/half. Thanks. - Alex ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
