[Bug 220198] igb stats double counting in 12-CURRENT

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220198

Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> changed:

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                 CC|                            |kaho at elam.kais.kyoto-u.ac.j
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--- Comment #3 from Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> ---
(In reply to commit-hook from comment #1)

I think the bug is fixed by this commit, but it is not a good way.

1. Every driver using iflib should set IFCAP_HWSTATS flag within the driver.
For example, in the em(4) driver, add IFCAP_HWSTATS flag
into #define EM_CAPS and #define IGB_CAPS lines of if_em.c.

2. The IFCAP_FLAGS in iflib.c seems to hold flags which can be changed by
a ioctl function. Who want to set or unset the IFCAP_HWSTATS flag
by a function?

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