https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199716
Bug ID: 199716
Summary: em doesn't increment adapter->rx_overruns in msix mode
Product: Base System
Version: 10.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
When using msix interrupt model (e.g. 82574L chip), all interrupts excepted
E1000_ICR_RXQ0, E1000_ICR_RXQ1, E1000_ICR_TXQ0, E1000_ICR_TXQ1 are handled by
the em_msix_link() function.
Currently, this function only checks for E1000_ICR_LSC:
https://svnweb.freebsd.org/base/releng/10.1/sys/dev/e1000/if_em.c?view=markup#l1615
Hence when an E1000_ICR_RXO interrupt occurs, it's cleared (because of ICR
reading), but adapter->rx_overruns is *not* incremented.
This may hide a chip hang (bug #199174).
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