On 02/12/2017 10:52 PM, James Smart wrote: > > 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: Dick Kennedy <dick.kennedy@xxxxxxxxxxxx> > Signed-off-by: James Smart <james.smart@xxxxxxxxxxxx> > Apologies accepted :-) Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)
