From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
rolandd-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH v2] [RFC] rdma/cm: support option to allow manually setting IB path
Date: Thu, 22 Oct 2009 12:36:36 -0600 [thread overview]
Message-ID: <20091022183636.GA14520@obsidianresearch.com> (raw)
In-Reply-To: <67280F81CB6F417DA6EEE22448ED5500-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
On Thu, Oct 22, 2009 at 11:28:11AM -0700, Sean Hefty wrote:
> I don't like the idea of the kernel silently ignoring the alternate path.
> Returning an error seems like a better idea.
Then provide a way for userspace to know WTF to do. Without a
negotiation process this is now an 'impossible to use right' API.
There are other kernel protocols that work like this, some netlink
stuff works like this for instance. The notion of providing multiple
options and having the kernel pick the ones it supports is a standard
technique for forward API compatability.
How about a compromise. Add a IB_PATH_MUST or something, if the kernel
skips over an entry marked like that due to no support then it returns
-ENOSYS. Userspace that really cares can use that flag. I expect most
cases won't care..
Jason
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next prev parent reply other threads:[~2009-10-22 18:36 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-05 17:43 [PATCH 1/2] rdma/cm: support option to allow manually setting IB path Sean Hefty
[not found] ` <F0EFC2D8E6A340D48497497670C5969C-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-05 17:45 ` [PATCH 2/2] rdma/cm: allow user to specify IP to DGID mapping Sean Hefty
[not found] ` <F451C333D8CB45E4B4642C6BD1EDD3C3-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-06 8:00 ` Or Gerlitz
[not found] ` <4ACAF913.3050909-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-06 19:05 ` Sean Hefty
[not found] ` <AA7E7C8FC2A04B9688CD69CEB7355DF8-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-06 20:07 ` Jason Gunthorpe
[not found] ` <20091006200739.GP5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-06 22:53 ` Sean Hefty
[not found] ` <B266C10D3C26431E8FF5012420132452-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-06 23:17 ` Jason Gunthorpe
[not found] ` <20091006231720.GR5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-07 1:20 ` Sean Hefty
[not found] ` <3F7D26D4BA1C46F18F2F87BDD7EB7F36-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-07 5:26 ` Jason Gunthorpe
[not found] ` <20091007052639.GB18578-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-07 19:16 ` Sean Hefty
[not found] ` <20ADF14BE2B24B459DC3921F69449E61-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-07 20:32 ` Jason Gunthorpe
[not found] ` <20091007203257.GT5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-07 21:20 ` Hefty, Sean
[not found] ` <CF9C39F99A89134C9CF9C4CCB68B8DDF12C180FFD1-osO9UTpF0USkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2009-10-07 21:45 ` Jason Gunthorpe
2009-10-07 22:23 ` Or Gerlitz
[not found] ` <15ddcffd0910071523w4f229b14j905ad170ceb8c21f-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-10-07 23:42 ` Sean Hefty
[not found] ` <9F4DE6A2B4F644698E94F00C4FEEF30A-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-08 0:38 ` Sean Hefty
[not found] ` <0A383504E0E54C949DEF84405E3AE92F-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-08 0:54 ` Jason Gunthorpe
[not found] ` <20091008005425.GW5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-08 6:46 ` Sean Hefty
[not found] ` <3BA5B96263EC4ACA8FF3C4D8DCF47C69-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-08 17:21 ` Jason Gunthorpe
[not found] ` <20091008172120.GX5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-08 23:39 ` Or Gerlitz
2009-10-08 23:33 ` Or Gerlitz
[not found] ` <15ddcffd0910081633q20d98abfg41a9f4e781e486b1-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-10-09 0:24 ` Sean Hefty
[not found] ` <859D79BFCA4741F393AABF76BBCA4F7B-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 10:22 ` Or Gerlitz
[not found] ` <4ADD8F5F.3010008-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-20 18:08 ` Sean Hefty
[not found] ` <9F76F7CD7B9048E8821A1B05CC5FAFE8-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 18:31 ` Jason Gunthorpe
[not found] ` <20091020183132.GE14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-20 19:13 ` Sean Hefty
[not found] ` <A47D2FC6B143436DB87704307B0E715D-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 19:18 ` Jason Gunthorpe
[not found] ` <20091020191821.GI14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-20 20:05 ` Sean Hefty
[not found] ` <8D09997BDBC5482C86EAD338F19C8030-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 20:29 ` Jason Gunthorpe
[not found] ` <20091020202902.GJ14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-20 20:48 ` Sean Hefty
[not found] ` <B7BCBF813BF447B28330C2DB8F1437D6-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 21:30 ` Jason Gunthorpe
2009-10-22 15:41 ` Or Gerlitz
[not found] ` <4AE07D41.7040300-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-22 16:39 ` Jason Gunthorpe
[not found] ` <20091022163904.GC26003-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-25 11:32 ` Or Gerlitz
[not found] ` <4AE4374B.6020104-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-25 18:50 ` Jason Gunthorpe
2009-10-22 19:14 ` Sean Hefty
[not found] ` <9574E625AB3C48E6A7DF1A2760882363-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-25 11:25 ` Or Gerlitz
[not found] ` <4AE435A1.6040309-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-25 18:32 ` Jason Gunthorpe
2009-10-09 0:33 ` Jason Gunthorpe
2009-10-08 23:13 ` Or Gerlitz
2009-10-05 17:56 ` [PATCH 1/2] rdma/cm: support option to allow manually setting IB path Jason Gunthorpe
[not found] ` <20091005175656.GK5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-05 18:08 ` Sean Hefty
[not found] ` <F7D418716F3A4A0DACE42CC449624298-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-05 18:15 ` Jason Gunthorpe
[not found] ` <20091005181525.GL5191-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-05 19:20 ` Sean Hefty
2009-10-06 15:01 ` Todd Rimmer
[not found] ` <5AEC2602AE03EB46BFC16C6B9B200DA8168EFD82BA-e4KNYiSEog6Xx9kJd3VG2h2eb7JE58TQ@public.gmane.org>
2009-10-06 19:05 ` Sean Hefty
[not found] ` <D61F37041B6F49ACB0AC64FBF2DC4D00-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-07 5:30 ` Jason Gunthorpe
2009-10-09 21:48 ` Sean Hefty
[not found] ` <A08104C1CF70400F8BEF492AD49C8491-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-13 13:06 ` Or Gerlitz
[not found] ` <4AD47B40.8070800-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-20 10:23 ` Or Gerlitz
[not found] ` <4ADD8FAA.902-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-10-20 15:52 ` Sean Hefty
2009-10-20 18:14 ` Jason Gunthorpe
[not found] ` <20091020181458.GD14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-20 18:34 ` Sean Hefty
[not found] ` <46770152ACA04B6C8AA9497C45AC8FD0-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-20 19:14 ` Jason Gunthorpe
[not found] ` <20091020191404.GH14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-22 0:14 ` Sean Hefty
[not found] ` <9DFD8E65325F4EE990749EEBE4BC33CA-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-22 0:42 ` Jason Gunthorpe
[not found] ` <20091022004245.GV14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-22 1:07 ` Sean Hefty
[not found] ` <AE35305D45DB49F591A45DADD822209A-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-22 1:35 ` Jason Gunthorpe
[not found] ` <20091022013542.GX14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-22 8:10 ` [PATCH v2] [RFC] " Sean Hefty
[not found] ` <B7E97540810E4A2785FF1FC8CB96F453-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-22 16:54 ` Jason Gunthorpe
[not found] ` <20091022165414.GH26003-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-22 17:52 ` Sean Hefty
[not found] ` <1438C87E89284364A56E08A40DFE199E-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-22 18:11 ` Jason Gunthorpe
[not found] ` <20091022181101.GY14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-22 18:28 ` Sean Hefty
[not found] ` <67280F81CB6F417DA6EEE22448ED5500-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-22 18:36 ` Jason Gunthorpe [this message]
2009-10-22 20:26 ` [PATCH v3] " Sean Hefty
[not found] ` <DC0770A17FDC4DACAC0251A3362CE87A-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-28 18:11 ` Roland Dreier
[not found] ` <adaiqdzs81h.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-10-28 19:00 ` Sean Hefty
[not found] ` <B82A674A574A4A239FBF3FFCBF5D6BB6-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-11-01 6:50 ` Or Gerlitz
2009-10-28 19:14 ` Jason Gunthorpe
[not found] ` <20091028191454.GL14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-28 19:37 ` Sean Hefty
[not found] ` <5082D185D95A4389BC9EEA666CAEBA66-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-28 20:25 ` Jason Gunthorpe
[not found] ` <20091028202545.GM14520-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-28 21:41 ` Sean Hefty
[not found] ` <24B14DCC9C3645FB92194300C8F5D441-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-10-28 22:24 ` Jason Gunthorpe
2009-10-30 1:49 ` [PATCH v4] " Sean Hefty
[not found] ` <1B115D7248A5404781F001F72A7C591A-Zpru7NauK7drdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2009-11-01 7:10 ` Or Gerlitz
[not found] ` <4AED347A.1060301-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2009-11-02 18:59 ` QoS in local SA entity: was " Sean Hefty
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