• UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2 errors:0 dropped:0 overruns:0 frame:0 TX packets:2 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:140 (140.0 B) TX bytes:140 (140.0 B) Response of "ethtool -S eth0": NIC statistics: Good Rx Frames: 0 Broadcast Rx Frames: 0 Multicast Rx Frames: 0 Pause Rx Frames: 0
  • [PATCH net 2/2] cxgb4: Fix race between loopback and normal Tx path Ganji Aravind Tue, 18 Aug 2020 08:41:53 -0700 Even after Tx queues are marked stopped, there exists a small window where the current packet in the normal Tx path is still being sent out and loopback selftest ends up corrupting the same Tx ring.
  • This might be caused by enabled WOL. To solve this problem, disable it by using ethtool as mentioned above. # ethtool -s net0 wol d Realtek. Users with Realtek 8168 8169 8101 8111(C) based NICs (cards / and on-board) may notice a problem where the NIC seems to be disabled on boot and has no Link light.
# ip addr 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: enp0s3: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 08:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff inet xx.xx.xx.xx/24 brd xx.xx.xx.xx scope global dynamic enp0s3 valid ...
Jan 26, 2020 · Change ethernet card to 10Mbps (ethtool doesn’t work for FC1) pwangee: Fedora: 6: 07-08-2004 08:30 AM: Change ethernet card to 10Mbps (ethtool doesn’t work for FC1) pwangee: Linux - Networking: 0: 07-07-2004 09:45 AM
Sep 04, 2012 · Please note that the ifconfig and ip commands will also display interfaces information about vpn, loopback, and other configured interfaces. Tutorial details Difficulty
ethtool is used to query and control network device driver and hardware settings, particularly for wired Ethernet devices. devname is the name of the network device on which ethtool should operate. OPTIONS ethtool with a single argument specifying the device name prints current settings of the specified device.

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33.6. Ethtool. Ethtool is a Linux-specific tool with corresponding support in the kernel where each net device must register its own callbacks for the supported operations. The current implementation uses the igb/ixgbe modified Linux drivers for ethtool support. Ethtool is not supported in i40e and VMs (VF or EM devices).
  • Apr 08, 2010 · This feature is used for component and driver test coverage by putting the device in hardware loopback mode and sending / receiving network traffic from a user application to test the hardware and driver transmit / receive paths.
    • Jan 26, 2020 · Change ethernet card to 10Mbps (ethtool doesn’t work for FC1) pwangee: Fedora: 6: 07-08-2004 08:30 AM: Change ethernet card to 10Mbps (ethtool doesn’t work for FC1) pwangee: Linux - Networking: 0: 07-07-2004 09:45 AM
    • Hi I'm trying to set a local or remote loopback to my adapter. this is the result /i40e-2.4.10/src$ sudo ethtool -t enp1s0f0 external_lb The test result is FAIL External loopback test was not executed The test extra info: Register test (offline) 0 Eeprom test (offline) 0 Interrupt test (offline) 0 L...
  • Hi I'm trying to set a local or remote loopback to my adapter. this is the result /i40e-2.4.10/src$ sudo ethtool -t enp1s0f0 external_lb The test result is FAIL External loopback test was not executed The test extra info: Register test (offline) 0 Eeprom test (offline) 0 Interrupt test (offline) 0 L...
  • Oct 28, 2010 · Ethtool utility is used to view and change the ethernet device parameters. 1. List Ethernet Device Properties. When you execute ethtool command with a device name, it displays the following information about the ethernet device.
  • Sep 15, 2020 · > > > Loopback test is commonly implemented via ethtool -t > > > > This debugfs entry is only to set the port to loopback mode, not running a loopback test. > > Hence IMO adding a private flag is more suitable here and please correct me if I'm wrong. > > But either way, doing that from ethtool instead of debugfs is not a good practice in our case.
#!/bin/bash if [ -n "$1" ]; then /sbin/ethtool -G $1 rx 4096 tx 4096 /sbin/ethtool -K $1 tso on gso on fi Keep in mind this will attempt to apply settings to ALL interfaces, even the loopback. If we have different interfaces we want to apply different settings to, or want to skip the loopback, we can make a case statement
you're going to look in e1000_ethtool.c the function is e1000_diag_test, and from my quick look, code 13 from e1000_loopback_test is from a corrupt loopback test frame. This may indicate that your hardware is failing.
Sep 14, 2020 · > > Loopback test is commonly implemented via ethtool -t > > This debugfs entry is only to set the port to loopback mode, not running a loopback test. > Hence IMO adding a private flag is more suitable here and please correct me if I'm wrong. > But either way, doing that from ethtool instead of debugfs is not a good practice in our case.
ethtool --set-priv-flags eth<x> <priv flag> <on/off> Enables/disables driver feature matching the given private flag. ethtool --show-priv-flags eth<x> Shows driver private flags and their states (ON/OFF) The private flags are: qcn_disable_32_14_4_e; disable_mc_loopback - when this flag is on, multicast traffic is not redirected to the device by ...
  • Apr 08, 2010 · This feature is used for component and driver test coverage by putting the device in hardware loopback mode and sending / receiving network traffic from a user application to test the hardware and driver transmit / receive paths.

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