Hello Randy,

On 5/27/20 6:58 PM, Randy Dunlap wrote:

On 5/27/20 1:09 PM, André Almeida wrote:

quoted

Create a documentation providing a background and explanation around the
operation of the Multi-Queue Block IO Queueing Mechanism (blk-mq).

<snip>

quoted

+Hardware dispatch queues
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+The hardware queue is a memory space shared with the block device (e.g. DMA)
+where the hardware can access and dispatch requests (represented by struct
+:c:type:`blk_mq_hw_ctx`). To run this queue, the block layer removes
+requests from the associated software queues and tries to dispatch to the
+hardware.

This paragraph (above) says to me that these HW devices understand struct blk_mq_hw_ctx.
Is that correct?  Is is some kind of standard?  If so, where?

This wasn't what I intended to say here. The struct blk_mq_hw_ctx is an
abstraction from the blk-mq API used by device drivers to map the
submission queue of the hardware. So no, HW devices can't understand
struct blk_mq_hw_ctx. This paragraph was reworked for v2.

thanks for the documentation.

Thanks for the feedback.