[PATCH v2 0/4] arbitrary sg lists support

[Sagi Grimberg]

>> This patch adds an arbitrary sg list support to NVMEoF host for
>> capable devices (such as RDMA CX4/CX5 HCAs).
>> During the review we decided to add an helper function to ib_core
>> that will be used by ULPs in order to avoid code duplication.
>
> Hello Max,
>
> A question that is not related to the ULP drivers touched by this patch series:
> some time ago registration of sg-lists with gaps was disabled in the SRP
> initiator because arbitrary sg-lists triggered CQE dumps in combination with the
> mlx5 driver. Does this mean that this issue has been resolved? If so, what mlx5
> driver and/or firmware version are needed to reenable arbitrary sg-list support
> in the SRP initiator?

I'm concerned about the fact that the SRP issue wasn't resolved. There
might be a bug hiding there.

Max, Leon, my recollection was that the error syndrome you saw with SRP
described "too much sgls for a single mr". If this is true, then I still
think we need a different device capability for it.

I'm even thinking we need to remove gaps support from iSER until this
is addressed.