On Mon, 2009-08-31 at 14:53 -0700, Alok Kataria wrote: > Hi James, > > Thanks for your comments. > > On Mon, 2009-08-31 at 11:00 -0700, James Bottomley wrote: > > On Mon, 2009-08-31 at 10:28 -0700, Alok Kataria wrote: > > > VMware PVSCSI driver - v2. > > > > OK, so the first thing that springs to mind is that we already have one > > of these things: the ibmvscsi ... is there no way we can share code > > between this and the other PV drivers? > > I took a quick look at the ibmvscsi driver, and there are lot of > differences between the two, mainly the ABI that is shared between the > hypervisor and driver differ. Well, that's pretty abstractable, surely? However, there is an interesting question of what the best hypervisor interface actually is. > Also the ibmvscsi driver seems to offer a > lot of other features as well, like the SRP. SRP is the protocol transfer abstraction. It's just a way of packaging up SCSI commands for transfer over a DMA protocol (OK, so it was envisaged that the DMA protocol would be RDMA, but a hypervisor interface is also a DMA protocol). > The pvscsi driver is a simple SCSI adapter driver and is basically no > different than any other SCSI driver written for a particular HBA. Well, it is really ... hopefully all the hypervisor interfaces won't decide to be completely incompatible, so there's a good chance of code sharing between them. James -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
