2022-7 Question

[DaveHu-TVU]

Hi All,

Question1:
about 2022-7, how to get the 2022-7 information?
1: Which link is currently in use? Callback when switching links?
2: Number of packets lost on each link?
3: Signal on each link
Question2：
If I am currently using Tx20, continuing to run Rx20 will prompt:
PCI_BUS: Requested device 0000:15:00.0 cannot be used
EAL: Cannot open /dev/vfio/32: Device or resource busy
How to reuse the network card?

[gkelly1]

Hi @DaveHu-TVU,

Could you email us at mtl_support@intel.com.

I would like to discuss your project and how we can support you.

Regards,
Gordon

[DaveHu-TVU]

Got it, thanks!

[DawidWesierski4]

Hi im gonna give some answers here
Question 1:
Which link is currently in use? Callback when switching links?
There is no callback when switching links, the packets that come "first" are the ones being used methods to check which ports were being used vary depending on the stream
for st41, st40, st30 the method is quite easy as you can see it in the statistics ( st**_rx_get_session_stats)
st20 uses a little more sophisticated mechanizm of recreating frames so the stats about wchich ports were used during the st20 frame creation are not straightforward.

Generally most of the port statistics you can get with the st**_**_get_session_stats functions and mtl_get_port_stats.

Question2：
If I am currently using Tx20, continuing to run Rx20 will prompt:
PCI_BUS: Requested device 0000:15:00.0 cannot be used
EAL: Cannot open /dev/vfio/32: Device or resource busy
How to reuse the network card?

Generally this issue is connected with dpdk being tardy releasing the resources.
The only workaround we have for now is to wait, although the dpdk is reporting "freeing" the card it needs a few seconds afterwards before start of another process.