netdev | Asynchronous multi-vendor library | Automation library
kandi X-RAY | netdev Summary
kandi X-RAY | netdev Summary
Asynchronous multi-vendor library for interacting with network devices
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Top functions reviewed by kandi - BETA
- Send config set to the device
- Normalize linefeeds
- Normalize a command
- Send command
- Connect to the device
- Sets the base prompt
- Check if multiple mode is enabled
- Disable paging command
- Cleanup session
- Exit from shell mode
- Exit from enable mode
- Send config commands
- Exit from configuration mode
- Enter configuration mode
- Start the discovery server
- A task that sends a command to the device
- Task task
- Connect to device
- Exit enable mode
- Send configuration commands
netdev Key Features
netdev Examples and Code Snippets
Community Discussions
Trending Discussions on netdev
QUESTION
My goal is to connect two QEMU-KVM VMs on an overlay network. Each VM is running on a separate physical host and must have a static IP on the network 10.0.0.0/24. To achieve this goal, I want to use an OVS bridge with DPDK. I want to use the vhost-user-client protocol to connect the OVS bridge with the VMs.
My physical setup is the following: two physical machines equipped with a Mellanox ConnectX6-DX, and connected back-to-back (no physical switch). What I want to achieve is this:
...ANSWER
Answered 2022-Feb-12 at 16:38 suspect that the problem is related to the LINK_DOWN status of the vhost-client-1 port
[Answer] Yes, the cause for packet not reaching VM is OVS sees the interface down. Even with the presence of a rule to forward traffic from dpdk0 to vhost-client-1 the packets will be dropped.
The primary cause of link not up can be due to the qemu configuration memory backed with hugepages not being used. Vhost-USER port created by DPDK=OVS resides on the huge page memory area and access to the same is required.
A similar DPDK-QEMU StackOverflow address the use of viritio-client (via cmdline). So please adapt the settings shared into the link to virsh xml
template:
QUESTION
I am trying to get my BeagleBone Black to post to my monitor, to be able to use it as a stand-alone PC.
This was possible with the image that the BeagleBone shipped with.
I have just installed a new image on my BeagleBone Black Rev C.
The new image is AM3358 Debian 10.3 2020-04-06 4GB SD IoT.
I am able to SSH to it using PuTTY, and this way I have succesfully performed some actions with it, like using wget to download files from Google Drive etc.
So it seems like the board is working well, and that the HDMI output is disabled somewhere.
I have copied the contents of the uEnv.txt-file below, to show that the lines regarding disabling of video are commented out:
...ANSWER
Answered 2022-Jan-16 at 20:12I solved the problem, following a solution found here.
The solution was to run a kernel update:
QUESTION
So I have a kernel ebpf program that attach xdp hook to interface eno1, and in it I have a map ip_map that is of type BPF_MAP_TYPE_HASH that I am sharing with userspace. So in my userspace I am getting map's file descriptor, But now I like to get updated values of
struct share_me which I am sharing with the help of BPF_MAP_TYPE_HASH type map in my userspace loader program.
Any anyone please help me explain a bit, as to how I can do this,
So I am assuming if my map_fd is pointing to BPF_MAP_TYPE_HASH is pointing to my MAP then I can just do this int sizeof_share_me_read=read(map_fd,&share_me,sizeof(struct share_me)); so this way I can read current updated value of my map_fd(BPF_MAP_TYPE_HASH) shared from kernel ebpf program and that will contain current packet's ip header in struct iphdr dest_ip member of share_me object. Can any one please help me sort this out
user.c
...ANSWER
Answered 2022-Jan-16 at 12:10Now that you have the map fd, you need to use libbpf's bpf_map_lookup_elem function to read the values:
QUESTION
So I created a map of type BPF_MAP_TYPE_ARRAY.
...ANSWER
Answered 2022-Jan-16 at 11:11TL;DR. The issue is that you're making an out-of-bound access to the packet from the verifier's point of view. You need to check the packet is long enough to actually contain the IP header first.
Reading the verifier error message.
QUESTION
Thank you for watching this.
I'm having difficulties with my BBB on CAN communication like for months... I'd be really pleased if you could give me just a little help!
I'm working on CAN protocol between BBB and another CAN device. The another device is confirmed to be working alright with CAN. I'm using my BBB with Cloud9 platform on windows laptop, and on the another device, it's using CAN0.
I have set the 'config-pin' on BBB like below using CAN1, and I tried 'cansend' utility. The bitratre value on the another device is also set to be equal.
...ANSWER
Answered 2021-Aug-07 at 03:47Some help on can or socketCAN will be found here for the BBB or other family board:
QUESTION
I have deployed OpenStack and configured OVS-DPDK on compute nodes for high-performance networking. My workload is a general-purpose workload like running haproxy, mysql, apache, and XMPP etc.
When I did load-testing, I found performance is average and after 200kpps packet rate I noticed packet drops. I heard and read DPDK can handle millions of packets but in my case, it's not true. In guest, I am using virtio-net which processes packets in the kernel so I believe my bottleneck is my guest VM.
I don't have any guest-based DPDK application like testpmd etc. Does that mean OVS+DPDK isn't useful for my cloud? How do I take advantage of OVS+DPDK with a general-purpose workload?
We have our own loadtesting tool which generate Audio RTP traffic which is pure UDP based 150bytes packets and noticed after 200kpps audio quality go down and choppy. In short DPDK host hit high PMD cpu usage and loadtest showing bad audio quality. when i do same test with SRIOV based VM then performance is really really good.
...ANSWER
Answered 2021-Nov-24 at 04:50When I did load-testing, I found performance is average and after 200kpps packet rate I noticed packet drops. In short DPDK host hit high PMD cpu usage and loadtest showing bad audio quality. when i do same test with SRI
[Answer] this observation is not true based on the live debug done so far. The reason as stated below
- qemu launched were not pinned to specific cores.
- comparison done against PCIe pass-through (VF) against vhost-client is not apples to apples comparison.
- with OpenStack approach, there are at least 3 bridges before the packets to flow through before reaching VM.
- OVS threads were not pinned which led to all the PMD threads running on the same core (causing latency and drops) in each bridge stage.
To have a fair comparison against SRIOV approach, the following changes have been made with respect to similar question
QUESTION
I'm trying to test vhost-user/virtio-net. I used testpmd to send pkts (in txonly mode) to qemu VM. But all pkts were droped showed by testpmd. here is my environment:
...ANSWER
Answered 2021-Nov-23 at 13:30Looks like it has either DPDK or NUMA backed page issue. The same is working with DPDK version 19.11 LTS and 20.11 LTS.
DPDK application:
rm /tmp/sock0; sudo ./build/l2fwd --legacy-mem -l 1-2 --no-pci --vdev=net_vhost0,iface=/tmp/sock0 --vdev=net_tap0 -m 1024 -- -p 3 -T 1 --no-mac-updatingQEMU:
taskset -c 4-9 qemu-system-x86_64 -cpu host -enable-kvm -m 1024 -smp 4,sockets=1,cores=4,threads=1 \ -object memory-backend-file,id=mem,size=1024M,mem-path=/mnt/huge,share=on \ -numa node,memdev=mem,nodeid=0 -mem-prealloc \ -name test \ -no-reboot \ -vnc none \ -nographic \ -net user,hostfwd=tcp::10023-:22 -net nic \ -chardev socket,id=charnet0,path=/tmp/sock0 \ -netdev type=vhost-user,chardev=charnet0,queues=1,id=hostnet0 \ -device virtio-net-pci,mq=on,vectors=18,netdev=hostnet0,id=net0,mac=fa:16:3e:52:30:73 \ -hda [disk name]
Once the VM is booted, you can login via ssh port 10023.
QUESTION
I've followed the blog post and create an aarch64 vm with alpine 3.14 (virt) (with minor changes as the post is for linux and i'm on mac):
ANSWER
Answered 2021-Nov-08 at 11:08QUESTION
Building a rootfs using buildroot. My rootfs creates the "admin" user using this user-tables.txt:
...ANSWER
Answered 2021-Oct-19 at 08:30Just for reference to someone interested in this issue, the problem has been fixed. It was related with the "su" command, deployed by buildroot as a busybox applet. This applet doesn't work as expected despite CONFIG_PAM=y is enabled in busybox config file (vers 1.31.1).
This are the steps we followed to fix this:
- Remove "su" applet from busybox
QUESTION
- On Debian, trying to access ttyUSB0 (Serial over USB using an FTDI cable).
- My user groups: myuser tty dialout cdrom floppy sudo audio dip video plugdev netdev bluetooth lpadmin scanner
the .Net5 code:
...ANSWER
Answered 2021-Oct-05 at 06:27Posted as an answer because it was resolved with the commented content:
Is it necessary to add /dev/ to the beginning of the device file path to make it /dev/ttyUSB0?
Then you will need to check the owner and permissions of the device file.
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