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gve: update gve.rst

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Add a note about QPL and RDA mode

Signed-off-by: Rushil Gupta <rushilg@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Praveen Kaligineedi <pkaligineedi@google.com>
Signed-off-by: Bailey Forrest <bcf@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rushil Gupta
2023-08-04 21:34:44 +00:00
committed by David S. Miller
parent e7075ab4fb
commit 5a3f8d1231
1 changed files with 9 additions and 0 deletions
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Documentation/networking/device_drivers/ethernet/google/gve.rst
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@@ -52,6 +52,15 @@ Descriptor Formats
GVE supports two descriptor formats: GQI and DQO. These two formats have
entirely different descriptors, which will be described below.
Addressing Mode
------------------
GVE supports two addressing modes: QPL and RDA.
QPL ("queue-page-list") mode communicates data through a set of
pre-registered pages.
For RDA ("raw DMA addressing") mode, the set of pages is dynamic.
Therefore, the packet buffers can be anywhere in guest memory.
Registers
---------
All registers are MMIO.