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From: Stephen Hemminger <stephen@networkplumber.org>
To: Suanming Mou <suanmingm@nvidia.com>
Cc: Ferruh Yigit <ferruh.yigit@intel.com>, Ori Kam <orika@nvidia.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	NBU-Contact-Thomas Monjalon <thomas@monjalon.net>,
	"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 1/2] ethdev: make flow API primary/secondary process safe
Date: Wed, 14 Apr 2021 20:17:42 -0700
Message-ID: <20210414201742.72471c7c@hermes.local> (raw)
In-Reply-To: <BL0PR12MB2577BA2E54F5AE022A32E7FCC14D9@BL0PR12MB2577.namprd12.prod.outlook.com>

On Thu, 15 Apr 2021 02:55:17 +0000
Suanming Mou <suanmingm@nvidia.com> wrote:

> Hi,
> 
> > -----Original Message-----
> > From: Ferruh Yigit <ferruh.yigit@intel.com>
> > Sent: Wednesday, April 14, 2021 9:07 PM
> > To: Suanming Mou <suanmingm@nvidia.com>; Ori Kam <orika@nvidia.com>;
> > Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>; NBU-Contact-Thomas
> > Monjalon <thomas@monjalon.net>
> > Cc: dev@dpdk.org; Stephen Hemminger <stephen@networkplumber.org>
> > Subject: Re: [dpdk-dev] [PATCH 1/2] ethdev: make flow API primary/secondary
> > process safe
> > 
> > On 3/16/2021 11:48 PM, Suanming Mou wrote:  
> > > Hi Stephen,
> > >  
> > >> -----Original Message-----
> > >> From: Stephen Hemminger <stephen@networkplumber.org>
> > >> Sent: Tuesday, March 16, 2021 3:27 AM
> > >> To: dev@dpdk.org
> > >> Cc: Stephen Hemminger <stephen@networkplumber.org>; Suanming Mou
> > >> <suanmingm@nvidia.com>
> > >> Subject: [PATCH 1/2] ethdev: make flow API primary/secondary process
> > >> safe
> > >>
> > >> Posix mutex are not by default safe for protecting for usage from
> > >> multiple processes. The flow ops mutex could be used by both primary
> > >> and secondary processes.  
> > >
> > > Process safe is something more widely scope. I assume it should be another  
> > feature but not a bugfix for thread-safe?  
> > > And the fag RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE we have added is just  
> > thread safe.  


> > >  
> > 
> > Hi Suanming,
> > 
> > I think 'RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE' flag and what this patch
> > address are different issues.
> > 
> > 'RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE' is to add/remove synchronization
> > support for flow APIs, that is for thread safety as flag name suggests.
> > 
> > This patch is to solve the problem for multi process, where commit log describes
> > as posix mutex is not safe for multiple process.  
> 
> So for PMDs which not set the RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE capability bit, they will have the process level protection in multi-process.
> For PMDs which set the RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE capability bit, this change does not help with these PMDs. If the PMD with RTE_ETH_DEV_FLOW_OPS_THREAD_SAFE capability bit  internally does not support multi-process, they may still suffer crash etc. (If I understand correctly, mlx PMD level now should support multi-process, but better to have the confirmation from maintainers with much deeper level).
> I assume this patch solves the posix mutex for multi-process only, hard to say the flow API primary/secondary process safe after that patch.

Maybe we need a FLOW_OPS_PROCESS_SAFE flag? and declare all existing drivers as not process safe?

  reply	other threads:[~2021-04-15  3:17 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-15 19:27 [dpdk-dev] [PATCH 0/2] Mark shared pthread mutex Stephen Hemminger
2021-03-15 19:27 ` [dpdk-dev] [PATCH 1/2] ethdev: make flow API primary/secondary process safe Stephen Hemminger
2021-03-16 23:48   ` Suanming Mou
2021-03-17  0:13     ` Stephen Hemminger
2021-03-17  0:32       ` Suanming Mou
2021-04-14 13:06     ` Ferruh Yigit
2021-04-15  2:55       ` Suanming Mou
2021-04-15  3:17         ` Stephen Hemminger [this message]
2021-04-15  7:42         ` Ferruh Yigit
2021-04-15 20:04           ` Stephen Hemminger
2021-04-16  0:57           ` Suanming Mou
2021-04-16  3:19           ` Ajit Khaparde
2021-04-16  1:41       ` fengchengwen
2021-04-16  8:12         ` Ferruh Yigit
2021-04-16  8:18   ` Ferruh Yigit
2021-04-19 17:14   ` Thomas Monjalon
2021-04-19 17:45     ` Stephen Hemminger
2021-04-19 18:09       ` Thomas Monjalon
2021-06-08  8:07   ` Andrew Rybchenko
2021-03-15 19:27 ` [dpdk-dev] [PATCH 2/2] net/failsafe: fix primary/secondary mutex Stephen Hemminger
2021-04-14 13:10   ` Ferruh Yigit
2021-04-16  8:19     ` Ferruh Yigit
2021-04-19 17:08   ` Thomas Monjalon
2021-06-08  8:00     ` Andrew Rybchenko
2021-06-08 15:42       ` Stephen Hemminger
2021-06-08 15:55         ` Andrew Rybchenko
2021-06-08 20:48           ` Stephen Hemminger
2021-06-09 10:04             ` Andrew Rybchenko
2021-06-14 14:43               ` Gaëtan Rivet
2021-03-15 19:45 ` [dpdk-dev] [PATCH 0/2] Mark shared pthread mutex Stephen Hemminger
2021-03-16 16:28 ` Stephen Hemminger
2021-04-16  8:25   ` Ferruh Yigit

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