• Sumit Saxena's avatar
    megaraid_sas: Reply Descriptor Post Queue (RDPQ) support · 179ac142
    Sumit Saxena authored
    This patch will create a reply queue pool for each MSI-X index and will
    provide an array of base addresses instead of the single address of
    legacy mode. Using this new interface the driver can support higher
    queue depths through scattered DMA pools.
    
    If array mode is not supported driver will fall back to the legacy
    method of reply pool allocation. This limits controller queue depth to
    1K max. To enable a queue depth of more than 1K driver requires firmware
    to support array mode and scratch_pad3 will provide the new queue depth
    value.
    
    When RDPQ is used, downgrading to an older firmware release should not
    be permitted. This may cause firmware fault and is not supported.
    Signed-off-by: default avatarKashyap Desai <kashyap.desai@avagotech.com>
    Signed-off-by: default avatarSumit Saxena <sumit.saxena@avagotech.com>
    Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
    179ac142
megaraid_sas.h 54.5 KB