[PATCH v2] ethdev: add Linux ethtool link mode conversion

[Morten Brørup]

> From: Stephen Hemminger [mailto:stephen at networkplumber.org]
> Sent: Thursday, 29 February 2024 17.45
> 
> On Thu, 29 Feb 2024 16:42:56 +0100
> Thomas Monjalon <thomas at monjalon.net> wrote:
> 
> > +/* Link modes sorted with index as defined in ethtool.
> > + * Values are speed in Mbps with LSB indicating duplex.
> > + *
> > + * The ethtool bits definition should not change as it is a kernel
> API.
> > + * Using raw numbers directly avoids checking API availability
> > + * and allows to compile with new bits included even on an old
> kernel.
> > + *
> > + * The array below is built from bit definitions with this shell
> command:
> > + *   sed -rn 's;.*(ETHTOOL_LINK_MODE_)([0-9]+)([0-9a-zA-Z_]*).*=
> *([0-9]*).*;'\
> > + *           '[\4] = \2, /\* \1\2\3 *\/;p'
> /usr/include/linux/ethtool.h |
> > + *   awk '/_Half_/{$3=$3+1","}1'
> > + */
> > +static uint32_t link_modes[] = {
> 
> Make it const please.
> 
> You could add meson rule to generate it and then use non-numeric tags.

However you do it, make sure it cross builds. The kernel/ethtool on the target system may differ from the one on the build system.