CVE-2022-49725

In the Linux kernel, the following vulnerability has been resolved:

i40e: Fix call trace in setuptxdescriptors

After PF reset and ethtool -t there was call trace in dmesg sometimes leading to panic. When there was some time, around 5 seconds, between reset and test there were no errors.

Problem was that pf reset calls i40evsiclose in prepforreset and ethtool -t calls i40evsiclose in diagtest. If there was not enough time between those commands the second i40evsiclose starts before previous i40evsi_close was done which leads to crash.

Add check to diagtest if pf is in reset and don't start offline tests if it is true. Add netifinfo("testing failed") into unhappy path of i40ediagtest()