Re: [PATCH for-next] RDMA/efa: Add CQ with external memory support

["Margolin, Michael" <mrgolin@amazon.com>]

On 5/18/2025 9:42 AM, Leon Romanovsky wrote:
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> On Thu, May 15, 2025 at 02:50:40PM +0000, Michael Margolin wrote:
>> Add an option to create CQ using external memory instead of allocating
>> in the driver. The memory can be passed from userspace by dmabuf fd and
>> an offset.
> EFA is unique here. This patch is missing description of why it is
> needed, and why existing solutions if any exist, can't be used.
>
> Thanks

I probably should have explained more, the purpose is creating CQs that 
reside in GPU HBM enabling low latency polling directly by the GPU. EFA 
isn't unique in receiving pre-allocated memory from userspace, the 
extension here is the use of dmabuf for that purpose as a general 
mechanism that allows using memory independent of its source. I will add 
more info in the commit message.

Michael