netdev - Re: [PATCH net-next v3 11/11] ice: add a devlink region for dumping NVM contents

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Message-ID: <20200326211908.GG11304@nanopsycho.orion>
Date:   Thu, 26 Mar 2020 22:19:08 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next v3 11/11] ice: add a devlink region for dumping
 NVM contents

Thu, Mar 26, 2020 at 07:37:18PM CET, jacob.e.keller@...el.com wrote:
>Add a devlink region for exposing the device's Non Volatime Memory flash
>contents.
>
>Support the recently added .snapshot operation, enabling userspace to
>request a snapshot of the NVM contents via DEVLINK_CMD_REGION_NEW.
>
>Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
>---
>Changes since RFC:
>* Capture the entire NVM instead of just Shadow RAM
>* Use vmalloc instead of kmalloc, since the memory does not need to be
>  physically contiguous.
>* Remove the direct reading function, as this will be sent in a separate
>  series
>
>Changes since v1:
>* use dev_err instead of dev_warn when a region fails to be created
>
>Changes since v2:
>* Removed redundant "out of memory" extack message
>* Fixed up function declaration alignment to avoid checkpatch.pl warnings
>
> Documentation/networking/devlink/ice.rst     | 26 ++++++
> drivers/net/ethernet/intel/ice/ice.h         |  2 +
> drivers/net/ethernet/intel/ice/ice_devlink.c | 96 ++++++++++++++++++++
> drivers/net/ethernet/intel/ice/ice_devlink.h |  3 +
> drivers/net/ethernet/intel/ice/ice_main.c    |  4 +
> 5 files changed, 131 insertions(+)
>
>diff --git a/Documentation/networking/devlink/ice.rst b/Documentation/networking/devlink/ice.rst
>index 37fbbd40a5e5..f3d6a3b50342 100644
>--- a/Documentation/networking/devlink/ice.rst
>+++ b/Documentation/networking/devlink/ice.rst
>@@ -69,3 +69,29 @@ The ``ice`` driver reports the following versions
>       - The version of the DDP package that is active in the device. Note
>         that both the name (as reported by ``fw.app.name``) and version are
>         required to uniquely identify the package.
>+
>+Regions
>+=======
>+
>+The ``ice`` driver enables access to the contents of the Non Volatile Memory
>+flash chip via the ``nvm-flash`` region.
>+
>+Users can request an immediate capture of a snapshot via the
>+``DEVLINK_CMD_REGION_NEW``
>+
>+.. code:: shell
>+
>+    $ devlink region new pci/0000:01:00.0/nvm-flash snapshot 1
>+    $ devlink region dump pci/0000:01:00.0/nvm-flash snapshot 1
>+
>+    $ devlink region dump pci/0000:01:00.0/nvm-flash snapshot 1
>+    0000000000000000 0014 95dc 0014 9514 0035 1670 0034 db30
>+    0000000000000010 0000 0000 ffff ff04 0029 8c00 0028 8cc8
>+    0000000000000020 0016 0bb8 0016 1720 0000 0000 c00f 3ffc
>+    0000000000000030 bada cce5 bada cce5 bada cce5 bada cce5
>+
>+    $ devlink region read pci/0000:01:00.0/nvm-flash snapshot 1 address 0
>+        length 16

I still think this should be one line. Anyway,

Reviewed-by: Jiri Pirko <jiri@...lanox.com>