From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Wu, Jingjing" <jingjing.wu@intel.com>,
"Dai, Wei" <wei.dai@intel.com>,
"Xing, Beilei" <beilei.xing@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v5] net/i40e: fix mirror rule reset when port is stopped
Date: Sat, 23 Sep 2017 10:37:22 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB9772584F24E51D@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <9BB6961774997848B5B42BEC655768F810E7B199@SHSMSX103.ccr.corp.intel.com>
> -----Original Message-----
> From: Wu, Jingjing
> Sent: Saturday, September 23, 2017 3:27 AM
> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Dai, Wei <wei.dai@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH v5] net/i40e: fix mirror rule reset when port is stopped
>
>
>
> > -----Original Message-----
> > From: Ananyev, Konstantin
> > Sent: Thursday, September 21, 2017 6:46 AM
> > To: Dai, Wei <wei.dai@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei
> > <beilei.xing@intel.com>
> > Cc: dev@dpdk.org; stable@dpdk.org
> > Subject: RE: [dpdk-dev] [PATCH v5] net/i40e: fix mirror rule reset when port is stopped
> >
> > Hi Wei,
> >
> > >
> > > Hi, Konstantin
> > >
> > > Without this patch, when a port is stopped, all mirror SW resource are cleared but HW
> > settings are still there.
> > > And once the port is started again, creating mirror rule may fail due to remain HW
> > settings.
> > >
> > > There is a testpmd use case which can show why this patch is needed.
> > > 1. bind PF to igb_uio
> > > #/root/dpdk-devbind.py -b igb_uio 0000:08:00.0
> > > 2. create 2 VFs
> > > #echo 2 > /sys/bus/pci/devices/0000\:08\:00.0/max_vfs
> > > 3. launch testpmd with PF, and set port mirror configuration
> > > #./x86_64-native-linuxapp-gcc/app/testpmd -c 3 -n 4 -- -i
> > > Testpmd > set port 0 mirror-rule 0 pool-mirror-up 0x1 dst-pool 1 on
> > > Testpmd > quit
> > > 4. relaunch testpmd with PF, and set port mirror as the same configuration
> > > #./x86_64-native-linuxapp-gcc/app/testpmd -c 3 -n 4 -- -i
> > > Testpmd > set port 0 mirror-rule 0 pool-mirror-up 0x1 dst-pool 1 on
> > > I40e_mirror_rule_set( ): failed to add mirror rule: ret = -53, aq_err = 13.
> > > Mirror rule add error: (Function not implemented)
> > >
> > > When testpmd is quitted, rte_eth_dev_stop( ) and then rte_eth_dev_close( ) are called.
> > > In these function, i40e_dev_stop( ) and i40e_dev_close( ) is called.
> > > And i40e_dev_stop is also called by i40e_dev_close( ).
> > >
> > > Without this patch, the error in second running of testpmd always happen.
> > > This patch can address this error.
> >
> > Thanks for explanation.
> > Though it seems that the patch while fixing the issue might introduce some
> > inconsistences:
> > 1. right now for i40e: dev_stop(port); dev_start(port) would keep existing HW mirror rule
> > working.
> > With your patch is not any more.
> > 2. What about ixgbe? Do we also need to change its behavior?
> > As I can see right now ixgbe doesn't reset any mirror rules at dev_stop().
> > Would it be reset automatically, or do we need to update ixgbe PMD too?
> >
> > About #1 - if we'll decide that this is a desired behavior that dev_stop() voids
> > all mirror rules, then at least we probably need to update the documentation.
> > As alternative - at dev_stop() we can reset only actual HW rule, but keep SW
> > configuration intact,
> > and restore them at dev_start().
> > I personally think second option is a bit better - as it preserves existing behavior,
> > and probably more convenient for the user.
>
> Yes, you reminded me the mirror is to VF. The mirror rule should be kept or at least
> be restored when device start again..
> Because the dev_stop should only stop the pf interface, but not affect VF. It looks
> like we don't delete the VEB we dev_stop.
> The reset behavior may need to be done in dev_close, but not in dev_stop.
if we can move that code into dev_close() , then indeed might be a better approach.
>
> >
> > About the patch itself, why just not:
> > while ((p_mirror = TAILQ_FIRST(&pf->mirror_list)))
> > i40e_mirror_rule_reset(dev, p_mirror->index);
> >
> Wei's v1 patch is doing like that. But I commented it to change it. Because
> i40e_mirror_rule_reset is doing a search in the list which is not necessary.
Yes, but it is a control path, so need to be extra quick here.
As a plus - avoid code duplication and easier to control/maintain it.
Konstantin
next prev parent reply other threads:[~2017-09-23 10:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-06 14:52 [dpdk-stable] [PATCH] " Wei Dai
2017-09-07 7:34 ` Dai, Wei
2017-09-07 7:35 ` Dai, Wei
2017-09-07 7:37 ` Tu, LijuanX A
2017-09-07 7:50 ` Wu, Jingjing
2017-09-07 9:22 ` Dai, Wei
2017-09-11 2:10 ` [dpdk-stable] [PATCH v2] " Wei Dai
2017-09-11 2:11 ` Wei Dai
2017-09-11 2:45 ` [dpdk-stable] [dpdk-dev] " Xing, Beilei
2017-09-13 7:32 ` Wu, Jingjing
2017-09-19 2:21 ` Wu, Jingjing
2017-09-20 1:44 ` Dai, Wei
2017-09-11 2:30 ` [dpdk-stable] " Wei Dai
2017-09-20 1:59 ` [dpdk-stable] [PATCH v3] " Wei Dai
2017-09-20 2:12 ` [dpdk-stable] [PATCH v4] " Wei Dai
2017-09-20 4:16 ` [dpdk-stable] [PATCH v5] " Wei Dai
2017-09-20 9:23 ` [dpdk-stable] [dpdk-dev] " Ananyev, Konstantin
2017-09-20 14:26 ` Dai, Wei
2017-09-20 22:46 ` Ananyev, Konstantin
2017-09-23 2:26 ` Wu, Jingjing
2017-09-23 10:37 ` Ananyev, Konstantin [this message]
2017-09-23 16:34 ` Dai, Wei
2017-09-25 6:36 ` [dpdk-stable] [PATCH v6] net/i40e: fix mirror rule reset when port is closed Wei Dai
2017-09-26 13:49 ` Wu, Jingjing
2017-09-28 15:49 ` Ferruh Yigit
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