On Mon, 5 Jun 2023, Thomas Monjalon wrote:
05/06/2023 16:03, Ivan Malov:
Hi Thomas,
Thanks for responding. Please see below.
On Mon, 5 Jun 2023, Thomas Monjalon wrote:
Hello,
05/06/2023 15:09, Ivan Malov:
Dear community,
Is there any means in DPDK to discover relationship between
network/physical ports of the given adapter/board and
etdevs deployed in DPDK application on top of it?
For example, in Linux, there are facilities like
/sys/class/net/<iface>/phys_port_name
/sys/class/net/<iface>/dev_port
and
devlink port show
Do we have something similar in DPDK?
We can get the device name of a port:
rte_eth_dev_get_name_by_port()
I'm afraid this won't do. Consider the following example.
Say, there's a NIC with two network ports and two PFs,
0000:01:00.0 and 0000:01:00.1. The user plugs these
PFs to DPDK application. The resulting ethdev IDs
are 0 and 1. If the user invokes the said API,
they will get 0000:01:00.0 and 0000:01:00.1.
But that's not what is really needed.
We seek a means to get the network port ID by
ethdev ID. For example, something like this:
- get_netport_by_ethdev(0) => 0
- get_netport_by_ethdev(1) => 1
If two different PCI functions are associated with the
same network port (0, for instance), this should be
- get_netport_by_ethdev(0) => 0
- get_netport_by_ethdev(1) => 0
Do we have something like that in DPDK?
No we don't have such underlying index.
I don't understand why it is needed.
To me the name is more informative than a number.
If no, would the feature be worthwhile implementing?
We may have discrepancies in different device classes.
I mean precisely "ethdev"s. I do realise, though, that
an ethdev may be backed by a vdev (af_xdp, etc.) = in
such cases the assumed "get_netport" method could
just return (-ENOTSUP). What do you think?
Are you interested only in PCI devices? Looks limited.
Feel free to make a global status of device names.
Could you please elaborate on this?
I thought you wanted to have device name in all device classes.
No, Thomas, I meant obtaining the physical port ID, in other
words, ID of the port where the cable/wire is attached.
Not the "device name". As I said, it might be possible
to have multiple PFs/VFs associated with a single
physical/"uplink" port of the network card. In
this case, the "ethdev name" is just "PF name"
and not the "physical port name".
We need the latter. Physical port name/index.
Thank you.
