From: Roopa Prabhu <roopa-qUQiAmfTcIp+XZJcv9eMoEEOCMrvLtNR@public•gmane.org>
To: Scott Feldman
<sfeldma-qUQiAmfTcIp+XZJcv9eMoEEOCMrvLtNR@public•gmane.org>
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Subject: Re: [patch net-next v2 8/9] switchdev: introduce Netlink API
Date: Sat, 20 Sep 2014 05:51:23 -0700 [thread overview]
Message-ID: <541D784B.6030302@cumulusnetworks.com> (raw)
In-Reply-To: <DDC24110-C3F5-470F-B9BE-1D1792415D1E-qUQiAmfTcIp+XZJcv9eMoEEOCMrvLtNR@public.gmane.org>
On 9/20/14, 1:10 AM, Scott Feldman wrote:
> On Sep 19, 2014, at 8:41 PM, Roopa Prabhu <roopa-qUQiAmfTcIp+XZJcv9eMoEEOCMrvLtNR@public•gmane.org> wrote:
>
>> On 9/19/14, 8:49 AM, Jiri Pirko wrote:
>>> Fri, Sep 19, 2014 at 05:25:48PM CEST, jhs-jkUAjuhPggJWk0Htik3J/w@public•gmane.org wrote:
>>>> On 09/19/14 09:49, Jiri Pirko wrote:
>>>>> This patch exposes switchdev API using generic Netlink.
>>>>> Example userspace utility is here:
>>>>> https://github.com/jpirko/switchdev
>>>>>
>>>> Is this just a temporary test tool? Otherwise i dont see reason
>>>> for its existence (or the API that it feeds on).
>>> Please read the conversation I had with Pravin and Jesse in v1 thread.
>>> Long story short they like to have the api separated from ovs datapath
>>> so ovs daemon can use it to directly communicate with driver. Also John
>>> Fastabend requested a way to work with driver flows without using ovs ->
>>> that was the original reason I created switchdev genl api.
>>>
>>> Regarding the "sw" tool, yes it is for testing purposes now. ovs daemon
>>> will use directly switchdev genl api.
>>>
>>> I hope I cleared this out.
>> We already have all the needed rtnetlink kernel api and userspace tools around it to support all
>> switching asic features. ie, the rtnetlink api is the switchdev api. We can do l2, l3, acl's with it.
>> Its unclear to me why we need another new netlink api. Which will mean none of the existing tools to
>> create bridges etc will work on a switchdev.
>> Which seems like going in the direction exactly opposite to what we had discussed earlier.
> Existing rtnetlink isn’t available to swdev without some kind of snooping the echoes from the various kernel components (bridge, fib, etc). With swdev_flow, as Jiri has defined it, there is an additional conversion needed to bridge the gap (bad expression, I know) between rtnetlink and swdev_flow. This conversion happens in the kernel components. For example, the bridge module, still driven from userspace by existing rtnetlink, will formulate the necessary swdev_flow insert/remove calls to the swdev driver such that HW will offload the fwd path.
>
> You have:
> user -> rtnetlink -> kernel -> netlink echo -> [some process] -> [some driver] -> HW
>
> Jiri has:
> user -> rtnetlink -> kernel -> swdev_* -> swdev driver -> HW
>
Keeping the goal to not change or not add a new userspace API in mind,
I have :
user -> rtnetlink -> kernel -> ndo_op -> swdev driver -> HW
Jiri has:
user -> genl (newapi) -> kernel -> swdev_* -> swdev driver -> HW
next prev parent reply other threads:[~2014-09-20 12:51 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-19 13:49 [patch net-next v2 0/9] introduce rocker switch driver with hardware accelerated datapath api Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 1/9] net: rename netdev_phys_port_id to more generic name Jiri Pirko
[not found] ` <1411134590-4586-2-git-send-email-jiri-rHqAuBHg3fBzbRFIqnYvSA@public.gmane.org>
2014-09-19 13:54 ` Jeff Kirsher
2014-09-19 13:49 ` [patch net-next v2 3/9] rtnl: expose physical switch id for particular device Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 4/9] net-sysfs: " Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 5/9] net: introduce dummy switch Jiri Pirko
[not found] ` <1411134590-4586-6-git-send-email-jiri-rHqAuBHg3fBzbRFIqnYvSA@public.gmane.org>
2014-09-20 5:21 ` Florian Fainelli
2014-09-20 7:37 ` Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 6/9] switchdev: add basic support for flow matching and actions Jiri Pirko
2014-09-20 5:32 ` Florian Fainelli
2014-09-20 7:28 ` Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 7/9] switchdev: add swdev features Jiri Pirko
2014-09-19 13:49 ` [patch net-next v2 8/9] switchdev: introduce Netlink API Jiri Pirko
2014-09-19 15:25 ` Jamal Hadi Salim
2014-09-19 15:49 ` Jiri Pirko
2014-09-19 17:57 ` Jamal Hadi Salim
2014-09-19 22:12 ` John Fastabend
2014-09-19 22:18 ` Jamal Hadi Salim
2014-09-20 5:39 ` Florian Fainelli
2014-09-20 8:25 ` Jiri Pirko
2014-09-20 8:17 ` Jiri Pirko
2014-09-20 10:19 ` Jamal Hadi Salim
2014-09-20 11:01 ` Thomas Graf
2014-09-20 11:32 ` Jamal Hadi Salim
2014-09-20 11:51 ` Thomas Graf
[not found] ` <20140920115140.GA3777-FZi0V3Vbi30CUdFEqe4BF2D2FQJk+8+b@public.gmane.org>
2014-09-20 12:35 ` Jamal Hadi Salim
2014-09-22 7:53 ` Jiri Pirko
[not found] ` <20140922075337.GA1828-6KJVSR23iU488b5SBfVpbw@public.gmane.org>
2014-09-22 11:48 ` Jamal Hadi Salim
2014-09-20 5:36 ` Florian Fainelli
2014-09-20 8:14 ` Jiri Pirko
2014-09-20 10:53 ` Thomas Graf
2014-09-20 22:50 ` Alexei Starovoitov
2014-09-22 8:13 ` Thomas Graf
2014-09-22 15:10 ` Tom Herbert
2014-09-22 22:17 ` Thomas Graf
[not found] ` <20140922221727.GA4708-FZi0V3Vbi30CUdFEqe4BF2D2FQJk+8+b@public.gmane.org>
2014-09-22 22:40 ` Tom Herbert
2014-09-22 22:53 ` Thomas Graf
2014-09-22 23:07 ` Tom Herbert
2014-09-23 1:36 ` John Fastabend
2014-09-23 7:19 ` Thomas Graf
2014-09-23 11:09 ` Jamal Hadi Salim
[not found] ` <CA+mtBx9ZVQ5r5Hzy9-uEnk+iu+HKkOP4+VANC06Xf8VvTxktwQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-23 9:18 ` Thomas Graf
2014-09-23 1:54 ` Alexei Starovoitov
2014-09-23 2:16 ` Tom Herbert
2014-09-23 4:11 ` Andy Gospodarek
2014-09-23 10:11 ` Thomas Graf
2014-09-23 15:32 ` Or Gerlitz
2014-09-24 13:32 ` Thomas Graf
2014-09-26 20:03 ` Or Gerlitz
2014-09-26 21:02 ` Thomas Graf
2014-09-23 9:52 ` Thomas Graf
2014-09-20 3:41 ` Roopa Prabhu
2014-09-20 8:09 ` Jiri Pirko
2014-09-20 12:39 ` Roopa Prabhu
2014-09-20 8:10 ` Scott Feldman
2014-09-20 10:31 ` Jamal Hadi Salim
[not found] ` <DDC24110-C3F5-470F-B9BE-1D1792415D1E-qUQiAmfTcIp+XZJcv9eMoEEOCMrvLtNR@public.gmane.org>
2014-09-20 12:51 ` Roopa Prabhu [this message]
2014-09-20 17:21 ` Scott Feldman
2014-09-20 17:38 ` Jiri Pirko
2014-09-21 1:30 ` Roopa Prabhu
2014-09-19 13:49 ` [patch net-next v2 9/9] rocker: introduce rocker switch driver Jiri Pirko
[not found] ` <1411134590-4586-1-git-send-email-jiri-rHqAuBHg3fBzbRFIqnYvSA@public.gmane.org>
2014-09-19 13:49 ` [patch net-next v2 2/9] net: introduce generic switch devices support Jiri Pirko
2014-09-19 14:15 ` [patch net-next v2 0/9] introduce rocker switch driver with hardware accelerated datapath api David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6D17495CC6-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2014-09-19 14:20 ` Jiri Pirko
2014-09-20 5:37 ` Florian Fainelli
-- strict thread matches above, loose matches on Subject: below --
2014-09-23 3:43 [patch net-next v2 8/9] switchdev: introduce Netlink API Alexei Starovoitov
2014-09-23 20:57 ` Tom Herbert
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