I'm trying to understand the 82599 chip, and I'd have a question concerning interrupts.
The data sheet (Revision: 2.74) marks bit 31 in EICR as "reserved", but the Linux driver
source defines it as
# define IXGBE_EICR_OTHER 0x80000000 /* Interrupt Cause Active */
I saw in the interrupt service routine that sometimes this bit is set when an interrupt
occurs, and sometimes it is reset. This applies to the same cause, for example
link status change (LSC).
Can somebody explain the meaning of this bit?