On 11/21/23 1:04 PM, Saeed Mahameed wrote:
On 21 Nov 12:44, Jakub Kicinski wrote:.
On Mon, 20 Nov 2023 23:06:19 -0800 Saeed Mahameed wrote:
high frequency diagnostic counters
So is it a debug driver or not a debug driver?
High frequency _diagnostic_ counters are a very useful tool for
debugging a high performance chip. So yes this is for diagnostics/debug.
Because I'm pretty sure some people want to have access to high freq
counters in production, across their fleet. What's worse David Ahern
has been pitching a way of exposing device counters which would be
common across netdev.
For context on the `what's worse ...` comment for those who have not
seen the netconf slides:
https://netdev.bots.linux.dev/netconf/2023/david.pdf
and I am having a hard time parsing Kuba's intent with that comment here
(knowing you did not like the pitch I made at netconf :-))
This is not netdev, this driver is to support ConnectX chips and SoCs
with any stack, netdev/rdma/vdpa/virtio and internal chip units and
acceleration engines, add to that ARM core diagnostics in case of
Blue-Field DPUs.
I am not looking for counting netdev ethernet packets in this driver.
I am also pretty sure David will also want an interface to access other
than netdev counters, to get more visibility on how a specific chip is
behaving.
yes, and h/w counters were part of the proposal. One thought is to
leverage userspace registered memory with the device vs mapping bar
space, but we have not moved beyond a theoretical discussion at this point.
Definite nack on this patch.
Based on what ?
It's a generic interface argument?