Wrap-up about the sr-iov, some passage may be forgotten.

Expose the SR-IOV virtual network interfaces ¹

Search for the pci interfaces (here the server has a 4 port intel network card).

root@srv:~# find /sys -name sriov_numvfs

/sys/devices/pci0000:00/0000:00:1c.0/0000:06:00.2/sriov_numvfs …

Examples of systemd network configurations.

These are some collection of systemd network configuration. It does not require anything installed but systemd, not even ifupdown.

note: Debian 9 aka Stretch

Simple DHCP ethernet setup

Interface: eth0, file name is not important, but it must have the .network suffix.

/etc/systemd/network …

Example session with the Thing Magic M5E-C Rfid device

I'm developing an AVR firmware which has to interact with the Thing Magic M5E-C rfid reader. Reading the datasheet may not be enough to get all the info someone need to get right to the point. At least it took me …

Bitfield with struct and union in C (gcc) with endianess

I have updated the union struct and bitfield in C fixing both the endianess of the bit-field and the warning message if the -Wpedantic is used with gcc (bit-field is a GCC extension).

/*
 * Copyright © 2016 Enrico Rossi <e.rossi@tecnobrain …

please see updated version: union struct bitfield and endianess in C

Typical usage of a bitfield with struct and union in C

/*
 * Copyright © 2016 Enrico Rossi <e.rossi@tecnobrain.com>
 *
 * This work is free. You can redistribute it and/or modify it under the
 * terms of the Do What The …