• James Smart's avatar
    scsi: lpfc: NVME Initiator: Base modifications · 895427bd
    James Smart authored
    NVME Initiator: Base modifications
    
    This patch adds base modifications for NVME initiator support.
    
    The base modifications consist of:
    - Formal split of SLI3 rings from SLI-4 WQs (sometimes referred to as
      rings as well) as implementation now widely varies between the two.
    - Addition of configuration modes:
       SCSI initiator only; NVME initiator only; NVME target only; and
       SCSI and NVME initiator.
       The configuration mode drives overall adapter configuration,
       offloads enabled, and resource splits.
       NVME support is only available on SLI-4 devices and newer fw.
    - Implements the following based on configuration mode:
      - Exchange resources are split by protocol; Obviously, if only
         1 mode, then no split occurs. Default is 50/50. module attribute
         allows tuning.
      - Pools and config parameters are separated per-protocol
      - Each protocol has it's own set of queues, but share interrupt
        vectors.
         SCSI:
           SLI3 devices have few queues and the original style of queue
             allocation remains.
           SLI4 devices piggy back on an "io-channel" concept that
             eventually needs to merge with scsi-mq/blk-mq support (it is
    	 underway).  For now, the paradigm continues as it existed
    	 prior. io channel allocates N msix and N WQs (N=4 default)
    	 and either round robins or uses cpu # modulo N for scheduling.
    	 A bunch of module parameters allow the configuration to be
    	 tuned.
         NVME (initiator):
           Allocates an msix per cpu (or whatever pci_alloc_irq_vectors
             gets)
           Allocates a WQ per cpu, and maps the WQs to msix on a WQ #
             modulo msix vector count basis.
           Module parameters exist to cap/control the config if desired.
      - Each protocol has its own buffer and dma pools.
    
    I apologize for the size of the patch.
    Signed-off-by: default avatarDick Kennedy <dick.kennedy@broadcom.com>
    Signed-off-by: default avatarJames Smart <james.smart@broadcom.com>
    
    ----
    Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
    Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
    895427bd
lpfc_vport.c 26.1 KB