Hi John - We have driver code of <mpt3sas> ready for this feature. Due to some other priority, we are not able to make any progress on this. Primarily we want to cover more unit testing and performance on this feature. We will be sending <mpt3sas> driver version soon. Kashyap > -----Original Message----- > From: John Garry [mailto:john.garry@xxxxxxxxxx] > Sent: Thursday, September 17, 2020 1:48 PM > To: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx>; > sreekanth.reddy@xxxxxxxxxxxx; Suganath Prabu Subramani <suganath- > prabu.subramani@xxxxxxxxxxxx> > Cc: MPT-FusionLinux.pdl@xxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; > Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>; Hannes Reinecke > <hare@xxxxxxxx>; Martin K . Petersen <martin.petersen@xxxxxxxxxx>; > axboe@xxxxxxxxx; Ming Lei <ming.lei@xxxxxxxxxx> > Subject: mpt3sas hostwide tagset? > > Hi guys, > > You may have noticed patchset "blk-mq/scsi: Provide hostwide shared tags > for SCSI HBAs", where we allow SCSI HBAs which have restriction of > hostwide > tagset to expose hw queues to blk-mq. Main motivation is to take advantage > of blk-mq CPU hotplug handling support [0], and also possibly [1]. > > From looking at this driver again, I now notice that mpt3sas seems to > have all > the characteristics of a driver which could make this change: > uses managed interrupts for some completion queues, manages internally > CPU<->queue mapping, does not set Scsi_Host.nr_hw_queues, and also uses > request->tag. > > Have you considered making this transition? Not sure if there are > technical > reasons not to. > > Thanks, > John > > [0] https://lore.kernel.org/linux-block/20200529135315.199230-1- > hch@xxxxxx/ > > [1] > https://lore.kernel.org/linux- > scsi/CAHsXFKFy+ZVvaCr=H224VGA755k45fAJhz5TaMz+tOP6hNpj1g@xxxxxxx > ail.com/ >
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