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From: "Wang, Haiyue" <haiyue.wang@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, "Zhang, Qi Z" <qi.z.zhang@intel.com>,
	"Wang, Liang-min" <liang-min.wang@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Xing, Beilei" <beilei.xing@intel.com>
Subject: Re: [dpdk-dev] [PATCH v4 2/3] net/iavf: enable PCI bus master after reset
Date: Wed, 5 May 2021 02:56:41 +0000
Message-ID: <BN8PR11MB379549BA45623156B0DCFE0FF7599@BN8PR11MB3795.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAJFAV8yf9PfMP4PF2CWt8SawQSgaijx7LMa_=wKH79ojbcuGEQ@mail.gmail.com>

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Tuesday, May 4, 2021 19:32
> To: Wang, Haiyue <haiyue.wang@intel.com>
> Cc: dev <dev@dpdk.org>; Zhang, Qi Z <qi.z.zhang@intel.com>; Wang, Liang-min <liang-min.wang@intel.com>;
> Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Subject: Re: [PATCH v4 2/3] net/iavf: enable PCI bus master after reset
> 
> On Tue, Apr 27, 2021 at 4:05 PM Haiyue Wang <haiyue.wang@intel.com> wrote:
> >
> > The VF reset can be triggerred by the PF reset event, in this case, the
> > PCI bus master will be cleared, then the VF is not allowed to issue any
> > Memory or I/O Requests.
> >
> > So after the reset event is detected, always enable the PCI bus master.
> >
> > Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
> > ---
> >  drivers/net/iavf/iavf_ethdev.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> > index d523a0618..9a0a20a29 100644
> > --- a/drivers/net/iavf/iavf_ethdev.c
> > +++ b/drivers/net/iavf/iavf_ethdev.c
> > @@ -2255,6 +2255,9 @@ iavf_dev_close(struct rte_eth_dev *dev)
> >         rte_free(vf->aq_resp);
> >         vf->aq_resp = NULL;
> >
> > +       if (vf->vf_reset)
> > +               rte_pci_set_bus_master(pci_dev, true);
> > +
> >         vf->vf_reset = false;
> 
> Not checking for the return code can leave the device in an invalid state.
> Then after this, calling the init code will fail.

From the upper application's view, if this bus master fix can't recover
the device into valid state, then the device hotplug API should be used
to make the device fully recover. So I'd prefer to call bus master "try
best" to fix. If still have error, the system may be in bad state. 

The init code is mostly called from PCI VFIO/UIO device management which
has enabled bus master. If we put the bus master here, people may confuse.
Bind setting the bus master with 'vf->vf_reset' together looks better.

> 
> I'd rather move rte_pci_set_bus_master() (it is a noop if bus master
> is already enabled) in the init path and check for the return code

In fact, not real noop, since the reading PCI ops may fail. ;-)

> there?
> WDYT?
> 
> 
> --
> David Marchand


  parent reply	other threads:[~2021-05-05  2:56 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21  5:02 [dpdk-dev] [PATCH v1 0/3] Fix PF reset causes VF memory request failure Haiyue Wang
2021-04-21  5:02 ` [dpdk-dev] [PATCH v1 1/3] bus/pci: enable PCI master in command register Haiyue Wang
2021-04-21  5:02 ` [dpdk-dev] [PATCH v1 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-04-21  5:02 ` [dpdk-dev] [PATCH v1 3/3] net/i40e: " Haiyue Wang
2021-04-21 11:59 ` [dpdk-dev] [PATCH v1 0/3] Fix PF reset causes VF memory request failure Zhang, Qi Z
2021-04-22  1:18 ` [dpdk-dev] [PATCH v2 0/3] fix " Haiyue Wang
2021-04-22  1:18   ` [dpdk-dev] [PATCH v2 1/3] bus/pci: enable PCI master in command register Haiyue Wang
2021-04-23 10:43     ` Kinsella, Ray
2021-04-23 12:07       ` Wang, Haiyue
2021-04-22  1:18   ` [dpdk-dev] [PATCH v2 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-04-22  1:18   ` [dpdk-dev] [PATCH v2 3/3] net/i40e: " Haiyue Wang
2021-04-23 11:39 ` [dpdk-dev] [PATCH v3 0/3] fix PF reset causes VF memory request failure Haiyue Wang
2021-04-23 11:39   ` [dpdk-dev] [PATCH v3 1/3] bus/pci: enable PCI master in command register Haiyue Wang
2021-04-23 12:32     ` Kinsella, Ray
2021-04-27  9:28     ` David Marchand
2021-04-27 13:34       ` Wang, Haiyue
2021-04-27 13:40         ` David Marchand
2021-04-23 11:40   ` [dpdk-dev] [PATCH v3 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-04-23 11:40   ` [dpdk-dev] [PATCH v3 3/3] net/i40e: " Haiyue Wang
2021-04-27 13:39 ` [dpdk-dev] [PATCH v4 0/3] fix PF reset causes VF memory request failure Haiyue Wang
2021-04-27 13:39   ` [dpdk-dev] [PATCH v4 1/3] bus/pci: set PCI master in command register Haiyue Wang
2021-04-27 15:07     ` Kinsella, Ray
2021-04-27 13:39   ` [dpdk-dev] [PATCH v4 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-04-28  3:34     ` Zhang, Qi Z
2021-05-04 11:32     ` David Marchand
2021-05-04 15:07       ` Wang, Haiyue
2021-05-05  2:56       ` Wang, Haiyue [this message]
2021-05-05  8:39         ` David Marchand
2021-05-06  3:02           ` Wang, Haiyue
2021-04-27 13:39   ` [dpdk-dev] [PATCH v4 3/3] net/i40e: " Haiyue Wang
2021-04-28  3:35     ` Zhang, Qi Z
2021-05-06  3:49 ` [dpdk-dev] [PATCH v5 0/3] fix PF reset causes VF memory request failure Haiyue Wang
2021-05-06  3:49   ` [dpdk-dev] [PATCH v5 1/3] bus/pci: set PCI master in command register Haiyue Wang
2021-05-06  3:49   ` [dpdk-dev] [PATCH v5 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-05-06  3:49   ` [dpdk-dev] [PATCH v5 3/3] net/i40e: " Haiyue Wang
2021-05-23 11:46 ` [dpdk-dev] [PATCH v6 0/3] fix PF reset causes VF memory request failure Haiyue Wang
2021-05-23 11:46   ` [dpdk-dev] [PATCH v6 1/3] bus/pci: set PCI master in command register Haiyue Wang
2021-05-23 11:46   ` [dpdk-dev] [PATCH v6 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-05-23 11:46   ` [dpdk-dev] [PATCH v6 3/3] net/i40e: " Haiyue Wang
2021-05-24  1:23 ` [dpdk-dev] [PATCH v7 0/3] fix PF reset causes VF memory request failure Haiyue Wang
2021-05-24  1:23   ` [dpdk-dev] [PATCH v7 1/3] bus/pci: set PCI master in command register Haiyue Wang
2021-05-24  1:23   ` [dpdk-dev] [PATCH v7 2/3] net/iavf: enable PCI bus master after reset Haiyue Wang
2021-06-04  2:07     ` Xing, Beilei
2021-05-24  1:23   ` [dpdk-dev] [PATCH v7 3/3] net/i40e: " Haiyue Wang
2021-06-04  1:58     ` Xing, Beilei
2021-06-08  8:31   ` [dpdk-dev] [PATCH v7 0/3] fix PF reset causes VF memory request failure David Marchand

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