• Julian Wiedmann's avatar
    s390/qdio: add IRQ reduction for error SBALs · c70d82e9
    Julian Wiedmann authored
    SBALs in PRIMED or ERROR state represent new work on the Input Queue.
    But while inbound_primed() does all sorts of ACK management for new
    PRIMED work, the same handling is currently missing for ERROR work.
    In particular the path for ERROR work doesn't clear up _old_ ACKs.
    
    Treat ERROR work the same as PRIMED work, but consider that the QEBSM
    auto-ACK feature doesn't apply here. So we need to set the ACK manually,
    as if it was a non-QEBSM device.
    
    Note that this doesn't aspire to actually improve performance, the main
    goal is to just unify the code paths and have consistent behaviour.
    Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
    Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
    c70d82e9
qdio_main.c 44.6 KB