ixl: Reset VSI statistics after initial sampling
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Authored by kbowling on Thu, Sep 3, 10:58 AM.

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Intel Networking
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Summary

The initial statistics update runs before the PF VSI has obtained its
firmware-assigned statistics counter index.  Discard that provisional
VSI baseline so the first update after initialization records the
correct hardware counter.

Without this reset, subtracting a larger provisional value from a newly
selected counter can be mistaken for a 32-bit wrap and report nearly
UINT32_MAX receive drops immediately after boot.

Reported by:    Daniel Braniss <danny@cs.huji.ac.il>
Obtained from:  Intel ixl 1.14.2
MFC after:      2 weeks