Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <9786872e-1063-e1ff-dc0d-6be5952a1826@opensynergy.com>
Date:   Tue, 18 Apr 2023 11:50:56 +0200
Subject: Re: [virtio-dev] Re: [RFC PATCH 1/1] can: virtio: Initial virtio CAN
 driver.
To:     Marc Kleine-Budde <mkl@pengutronix.de>,
        Mikhail Golubev <Mikhail.Golubev@opensynergy.com>
Cc:     Arnd Bergmann <arnd@kernel.org>,
        Jan Kiszka <jan.kiszka@siemens.com>,
        Harald Mommer <harald.mommer@opensynergy.com>,
        virtio-dev@lists.oasis-open.org, linux-can@vger.kernel.org,
        Netdev <netdev@vger.kernel.org>, linux-kernel@vger.kernel.org,
        Wolfgang Grandegger <wg@grandegger.com>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Dariusz Stojaczyk <Dariusz.Stojaczyk@opensynergy.com>,
        stratos-dev@op-lists.linaro.org,
        Matti Moell <Matti.Moell@opensynergy.com>
References: <20220825134449.18803-1-harald.mommer@opensynergy.com>
 <20220827093909.ag3zi7k525k4zuqq@pengutronix.de>
 <40e3d678-b840-e780-c1da-367000724f69@opensynergy.com>
 <c2c0ba34-2985-21ea-0809-b96a3aa5e401@siemens.com>
 <36bb910c-4874-409b-ac71-d141cd1d8ecb@app.fastmail.com>
 <c20ee6cf-2aae-25ef-e97f-0e7fc3f9c5b6@opensynergy.com>
 <20230414-scariness-disrupt-5ec9cc82b20c-mkl@pengutronix.de>
Content-Language: en-US
From:   Harald Mommer <hmo@opensynergy.com>
In-Reply-To: <20230414-scariness-disrupt-5ec9cc82b20c-mkl@pengutronix.de>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?R2pKcXZsMWdZVGVSbjRJQll0UWNnVFpNQ3VlT1J1RFh3L1VFOVVLQmlYa3ZG?=
 =?utf-8?B?cDNZRkV2NThvaXFmTVN5aEszTEZ1SjZwcFNBSm5tQS8zaUtIZzRPeHYyUUpP?=
 =?utf-8?B?eDlqWUFoT0wxRGF6eWN4cXU3VGtHNkNyaGtXQi9SQnFiWnNqcGRpTEUxbmJQ?=
 =?utf-8?B?N2I1RkUrRi9ta0NmMkJxNDdteWtVV1BDU3JIbzZ6bUZxdHExd1VwNU41MEFz?=
 =?utf-8?B?dVNEbk1CVnhONndsMnRRQmcyTGNXaEVYRGpnOTdvOHRpZnAweTV2Yms2MDND?=
 =?utf-8?B?eWc0Yk5pbEF5VFFBWnhtbnUySnZENWxJampDUlg2dlFGK3V3YjQzaTg0YU1h?=
 =?utf-8?B?aTNBV1Vmc3Rtb0k5dmRyZTZOSDl2WUVaYUs0a1RreFpBL2toNkEyc21Fb0Q2?=
 =?utf-8?B?SkJvWTVvS21SclR6VWl0QWlhejdac3d2dG9zalJXSHlwMFdxbVFGaDhZeHRm?=
 =?utf-8?B?QXh1NWRob1VBUmlVelRjempSQXhtVGZ3L3daRGh3YXE0R0I3MjNPcnpaWnlW?=
 =?utf-8?B?dHdJZnVlNXBpK0JvYjFJQmtxSUJrVHUrell1NTNodCtsL09FSDNDZnRYODIz?=
 =?utf-8?B?UFE1ekczZlVLVllSVklVOFEwY09IZ3hsb1JUZ3ViWXoybU5tWEY5b3NoUkhn?=
 =?utf-8?B?OHY3SCtOWXZjcUYxUGtuTTBHSGtMSUx3T2VQRGRzM3pUMEJWV2FaZi9nTlk1?=
 =?utf-8?B?N0hSY09VWVUzTFlieENBRFA0dmZadUFnZGpJeFdBYVNUejViTk1RQ2xvZlRn?=
 =?utf-8?B?VkxsaGhWWmlKMWFSbDZIZjRkQkcxY2tjUjl4NTU0WXNjRnJ2QytQdmFGMkdm?=
 =?utf-8?B?WnlFMlFoT0FRRXlTdm9jK28yclA0T1FWYkQyUFNMdy85b05CQVFNLzFZdllL?=
 =?utf-8?B?ZkwyeDZFa2dwYnorTytpcU43WFd5N2QyQlp3NURqSGp1RVN4eXplS0hxeWdn?=
 =?utf-8?B?MlhlOWIvcS9ubW1hVjdiSVJoRjlhNUVkV3g5STdvWi9XZnd3MDFPeGd5dFVr?=
 =?utf-8?B?YU5Pb1c5UGNwTDFXZ29LcGVtNVhyc2Qva2NweVd0NnFOcW9TbExVN0JXMk11?=
 =?utf-8?B?emR5R0l5QlBVbmNmOVJiUFFtcDZNYWhnQ0c4TGhzbWtvRE9iL1JKb2hWMGZ0?=
 =?utf-8?B?ZUZVMXFUaStockdtQTZwdjVrV0NYaUQwTW9QRGZmeUM3bTlReEFuaVRGTVd5?=
 =?utf-8?B?cnExWVFjbkV1YlNza3FKNlBnSzhaR0crOHdVUUhTQzNyc3VSUFJYN0lGeGtO?=
 =?utf-8?B?UTFHMzRlZGZYZGZrMDd0M1M5UnF4UDA0NE9RYzZ2RGhFZ2VBV2tUNEh6dE1t?=
 =?utf-8?B?MkVBK1FyaEFKYW92c0xUVnFQNm1sTFJybHVkWU16bzFURWJzWUxhd3Q1NEU5?=
 =?utf-8?B?R2VlOUlhc3ZUbFAxY3RlZnhJU3J0S0hoU0s1Q3pVcHRFVnhSUXArd0xYb2k0?=
 =?utf-8?B?UEUwTFBjZlNqc3JqbCtTSDZzVGdpNjFucmtJODNHQXN4ZHpjWmU1ZmRZUk4y?=
 =?utf-8?B?QjVQNDcxcEJHU1pxeXg4VFUyV1NYcXQzNFBHTVBKY0NhcFIwajVpVC9obzgw?=
 =?utf-8?B?VEhzWEgxTVhoTHhZZU11ZHJZVkd4UnFWUkxjaVIxcWt2UU5rSkNJQ3p1LzdO?=
 =?utf-8?B?WUlMajlyRVRMV3ZpTHErNStoK0hjQUR2azQ4eHJpR0hHTTBJamh2Q0lQcU4y?=
 =?utf-8?B?WVl1MkJXY0g3TEVuc01CL05kbTd4QVdsclhsYUJ5czh2YTJKY3lPb2VJYktl?=
 =?utf-8?B?YloxRXh6QzlFd3R5VTVQZmZZeU1FTjFIRGJmTVpvTGdiaWVvQnM5cFJIQzRL?=
 =?utf-8?B?NWwxQVk4dE5TQUhucjNIamFpeVVkWjdwdWsySEpERU50M1NFNzlLcDB4NFhr?=
 =?utf-8?B?MzE2MDRCcnBTckNzdHlRNGZPZVYvenVpZ0RJL3VJaVNQdllORFA0c1JqWDJj?=
 =?utf-8?B?d3Z1Z1ZIL29XRjdqcUhPRkZJSG1FTlJ1UGlPbThBbFNFS3hQYTBQVGlUZlE2?=
 =?utf-8?B?a0xnaCtTbS92U0J2SktrNHZyLzg5WlEySUN0WmF2QnVTcTlITWJNMGc5Z1N2?=
 =?utf-8?B?aEpUSEYxUFJPK21obGRXVFJ1ZEg0ZmdidUdPRDBKQ3R3MTVxbzJ5Qzl4L1J5?=
 =?utf-8?Q?17/Kl0CTNwxH6bkWJ03aG2MIn?=
X-OriginatorOrg: opensynergy.com
X-MS-Exchange-CrossTenant-Network-Message-Id: c2c66dce-76ce-4f6a-6a64-08db3ff2692f
X-MS-Exchange-CrossTenant-AuthSource: FR2P281MB1608.DEUP281.PROD.OUTLOOK.COM
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Apr 2023 09:50:58.4807
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 800fae25-9b1b-4edc-993d-c939c4e84a64
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: cvB16lw7BnkyhBvAtVpWlWEpFZejbtq2H92QUQ4YF0g4+znk9PhqfIyoVfWq4gjsDM26aTQfYhV3BowiRCR92w==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BE1P281MB2888
X-TM-AS-ERS: 104.47.7.176-0.0.0.0
X-TMASE-Version: StarCloud-1.3-9.1.1006-27572.007
X-TMASE-Result: 10--16.985200-4.000000
X-TMASE-MatchedRID: VfovoVrt/oaMcUzJS3sH3RFbgtHjUWLy3AJrtcannra9V4YavKxf4w7O
        3jV2jCDBG04xakpCTBlf4cur8LkD6a0QkrnHPFMssDpn40N9M3lNLPQl0QAltD+B/tp8itBT8Jg
        qp/3e7hdFFrjTpX9jDOPfMxADOGUTVZTAgBT1WR5uq3SU2oCL/jWBEYnpSn2FctZudseHPS3+jr
        zvGANth24AMi4V1HIgJJzhqHiEM5a5rzEqaXlmze0/o+/4D7DzlY0Q2YEHU95GMe+tDjQ3Fhlis
        v9ewQRTgtPnkZJDmxa5cURAloITPk1+zyfzlN7ygxsfzkNRlfLdB/CxWTRRuyUIayx+Skid
X-TMASE-XGENCLOUD: b5ea57cb-ce47-4195-be72-c69dee01fa43-0-0-200-0
X-TM-Deliver-Signature: 46CAC44A36CDDCA982E41BB76054CA30
X-TM-Addin-Auth: p+C6GD1P/9IBWxCLkxfohIU0jFB/o/kxOo8O3fsrvNaOFsmj6XluFLmBQR/
        W3impy0r4XXubh3Vc+8XtJ+/Eiz+rbCYZGWSkutUxoZr9JiGQvYYqkiyu9IGT9S7X6bhp1qkR7Y
        ZZRTFRPd57o3Cu6tsJVQn7kSbCMvHr86N/4T9gE16q6B0BqDNlS80FFynvLwTut6LLNhJozchaz
        H7aBGB7YIyq8yPNivkDn+w4nH91zZXHDr+7bwBXAoKtsViPtK48bDYOAXAKB4lhC9a2FH3C7nl5
        AubZPTxC1ObP9lo=.y4Ybx/wbvK5T52r7+UuZVUPBCPosx3IPdy6J85i1rX8XtBqmOcNbaevxjn
        dIyrvLrPivRQPIkOLxzsKECyjaQKZ80YYuNZfgUC4rxXynZ4OkJD0bDHA9Xg4xB89uVyCIiMc3Y
        K04LLcToHgb0n2TSNP8fFiPSTs7TjMnkCVg0Oa0soqxX0fCsBkYJNJymlrbWtgdU7zTHnxoOvVG
        i3mMcZGL72X3V0sSAn1AzNdVWIJT/wzz6X7aQcV4+ItFSCYawnSZ3Iv4seF/5igqDOiMHQK6Wxg
        6KMaF/lRklaGxUmKXOO89fgwQYfb+l/5gwWBtIE8lTCmxPuPUHXkYRY37Sg==
X-TM-Addin-ProductCode: EMS
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=opensynergy.com;
        s=TM-DKIM-20210503141657; t=1681811460;
        bh=kvG63K202b/TVgtzMSWWRauTxmljjHzzVGoHIee9Zg8=; l=1708;
        h=Date:To:From;
        b=MdmgptXPouKJF2bKkpYmte4KaZoc77GsCq/YDU2NORVzXPpIsa+zVyF5uWQmOdQHD
         ejIgbgf3qLN36pzECCwi08lWWXnbvZz7PY7bCLQa0jR86Aqs86UFHAzDJJAVjnKQm7
         nvfrfnOV14qocCKStMv74Fd6Wb84Hh7Oo+VMSMsFtSH2MBSXHPQNfMUNZ9wZ6UkoVo
         7xAXZuyUDLe/bbTUgx/4QSzjJ55aC92PzpqZbDhcBdzmR2yJsa/Lhmq/S86lC6b0SK
         I7Eb2/Ebims04AS9qUoKnkfYRRCKPNKkJ0VXgAb6U8zDmlM0su4c9PhMtBiGZ7J8re
         z13OzKdTebnfA==
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED
        autolearn=unavailable autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hello,

there is now an implementation of the device for qemu internally under 
review.

The paperwork with the company lawyer to publish source code has also 
been done.

At the same time we changed the driver and the specification draft also, 
especially the bus off indication is now done by a config space bit 
instead of having a dedicated indication queue. Minor updates to some 
other structures. This means what we have will match an updated driver 
and specification version not yet sent out. Also to be done so that 
people can play around.

So an open source qemu device is in the work and we are close to publish 
this in our public github repository but until now nothing has been 
pushed yet to github.

Regards
Harald

On 14.04.23 21:20, Marc Kleine-Budde wrote:
> On 03.02.2023 16:02:04, Harald Mommer wrote:
>> we had here at OpenSynergy an internal discussion about an open source
>> virtio-can device implementation.
>>
>> The outcome of this is now that an open source virtio-can device is to be
>> developed.
>>
>> It has not yet been decided whether the open source device implementation
>> will be done using qemu or kvmtool (or something else?). Negative or
>> positive feedback for or against one of those is likely to influence the
>> decision what will be used as basis for the development. Using kvmtool may
>> be easier to do for me (to be investigated in detail) but on the other hand
>> we have some people around in the team who have the knowledge to support
>> with qemu.
> It there some code available yet? We as Pengutronix will be on our
> yearly techweek soon and I want to look into the VirtIO CAN stuff.
>
> regards,
> Marc
>