On 4/25/2015 5:33 PM, Akinobu Mita wrote:
This patchset aims to fix several problems related to T10-PI support.
These patches can be applied on top of Sagi's "[v1] Simlify dif_verify
routines and fixup fileio protection information code" patchset.
Hi Akinobu,
I have given this some more thought,
This set adds DIF protected WRITE_SAME support. I don't think this
will work with a real transport that offload DIF computation (at least
not over RDMA - perhaps qlogic/emulex folks can comment on their
devices).
The problem is that the HBA does not have the write_same functionality
you introduce here, i.e. generate multiple same protection fields for a
single data block.
We can require the fabrics drivers to do that (probably compensate in
SW) or, we can have the write_same logic to live only in the
core/backend code.
In this case, for WRITE_SAME, have the fabrics generate/verify a single
data block (one integrity field) like they do today, and then the core
will expand it to the correct number of sectors using some form of
sbc_dif_expand_same()
I'm not sure which way is better...
Martin? Nic? Thoughts?
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