Re: NFS/RDMA device removal support

On Jul 13, 2016, at 3:30 PM, Jason Gunthorpe [off-list ref] wrote:

On Wed, Jul 13, 2016 at 02:31:10PM -0400, Chuck Lever wrote:

quoted

I believe ULPs will have to map these buffers again once a
new device is available. But as part of DEVICE_REMOVAL, does
the ULP have to explicitly unmap this memory?

Yes.

The desire is for 'struct ib_device' to become freeable after the
DEVICE_REMOVAL notifications complete. This means no ULP should retain a
kref on it.

Since you need a struct ib_device to call the ib_dma_* functions you
must do that before completing removal. The ulp must call the various
unmap functions, this is not done for you during unregister.

Jason, thanks for confirming.

--
Chuck Lever



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