Re: [PATCH 1/2] nvme-pci: allocate nvme_command within driver pdu

quoted

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All the nvme transport drivers had allocated the nvme command within the
driver's pdu except for pci. Align pci with everyone else and replace
the stack variable with the pdu command.

At some point in this series nvme_request.cmd should become the
actual structure instead of a pointer so that we can remove this
indiretion.  I'd be tempted to just do this in the initial patch,
but I'm fine with any kind of patch ordering.

I tried to start off in that direction, but had some trouble. All the
fabrics drivers embed their preallocated command within a larger
protocol specific payload, so we either need the indirection or have a
copy of the command.

Yes, tcp and fc have headers that prepend the command so its better
for them to have cmd+header allocated together.

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