Re: [PATCH v2 1/2] net: ethtool: Support setting ntuple rule count

On Sat, 2021-07-24 at 19:23 +0200, Andrew Lunn wrote:

On Fri, Jul 23, 2021 at 11:46:45PM +0530, Sunil Goutham wrote:

quoted

Some NICs share resources like packet filters across
multiple interfaces they support. From HW point of view
it is possible to use all filters for a single interface.
Currently ethtool doesn't support modifying filter count so
that user can allocate more filters to a interface and less
to others. This patch adds ETHTOOL_SRXCLSRLCNT ioctl command
for modifying filter count.

example command:
./ethtool -U eth0 rule-count 256

How can use see what the current usage is? How many in total you have
available?  What the current split is between the interfaces?

There is no point of adding this ethtool interface if the orchestration
tool already knows the "rule-count" in advance, it's just redundant to
have a user managed limiting device in ethtool.

You say:

   * Jakub suggested if devlink-resource can be used for this.

devlink-resource provides you a standardised mechanism to answer the
questions i just asked. So i would have to agree with Jakub.

+1, devlink is your address when a single device is shared across
multiple interfaces.

          Andrew