[dpdk-dev] [PATCH] net/i40e: force promiscuous state after VF reset

Xing, Beilei beilei.xing at intel.com
Fri Nov 1 03:38:09 CET 2019



> -----Original Message-----
> From: Eelco Chaudron [mailto:echaudro at redhat.com]
> Sent: Tuesday, October 29, 2019 3:47 PM
> To: Zhang, Xiao <xiao.zhang at intel.com>; Xing, Beilei <beilei.xing at intel.com>
> Cc: Zhang, Qi Z <qi.z.zhang at intel.com>; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] net/i40e: force promiscuous state after VF
> reset
> 
> 
> 
> On 29 Oct 2019, at 8:39, Zhang, Xiao wrote:
> 
> >> -----Original Message-----
> >> From: Eelco Chaudron <echaudro at redhat.com>
> >> Sent: Friday, October 25, 2019 5:24 PM
> >> To: Xing, Beilei <beilei.xing at intel.com>; Zhang, Xiao
> >> <xiao.zhang at intel.com>
> >> Cc: Zhang, Qi Z <qi.z.zhang at intel.com>; dev at dpdk.org
> >> Subject: Re: [dpdk-dev] [PATCH] net/i40e: force promiscuous state
> >> after VF reset
> >>
> >>
> >>
> >> On 17 Oct 2019, at 8:34, Xing, Beilei wrote:
> >>
> >>>> On 17 Sep 2019, at 9:40, Eelco Chaudron wrote:
> >>>>
> >>>>> Even though the device reset is successful, disabling promiscuous
> >>>>> mode might not always succeed, causing enabling it after reset to
> >>>>> fail.
> >>>>> This would happen when the kernel driver requires a reset of the
> >>>>> VF.
> >>>>>
> >>>>> This patch resets the internal state, so next time promiscuous
> >>>>> mode
> >>>>> is configured it will be enabled.
> >>>>>
> >>>>> Signed-off-by: Eelco Chaudron <echaudro at redhat.com>
> >>>>> ---
> >>>>>  drivers/net/i40e/i40e_ethdev_vf.c | 10 ++++++++++
> >>>>>  1 file changed, 10 insertions(+)
> >>>>>
> >>>>> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c
> >>>>> b/drivers/net/i40e/i40e_ethdev_vf.c
> >>>>> index 551f6fa..e0f99a4 100644
> >>>>> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> >>>>> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> >>>>> @@ -2276,11 +2276,21 @@ static int eth_i40evf_pci_remove(struct
> >>>>> rte_pci_device *pci_dev)  i40evf_dev_reset(struct rte_eth_dev
> >>>>> *dev)
> >>>>> {
> >>>>>  	int ret;
> >>>>> +	struct i40e_vf *vf =
> >>>>> I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
> >>>>>
> >>>>>  	ret = i40evf_dev_uninit(dev);
> >>>>>  	if (ret)
> >>>>>  		return ret;
> >>>>>
> >>>>> +	/*
> >>>>> +	 * Even though the device reset is successful disabling
> >>>>> promiscuous
> >>>>> +	 * mode might not always succeed, causing enabling it after
> >>>>> reset
> >>>>> to
> >>>
> >>> I think we need to root cause why fail to disable promiscuous mode
> >>> and
> >>> try to fix it first.
> >>
> >> I’ve copied in Xiao who helped me identify the issue in your
> >> driver.
> >>
> >> The issue is because the change from kernel pf was not synced to DPDK
> >> vf during
> >> the closing period of reset, so we get this failure. Xiao can you add
> >> more details?
> >>
> >
> > The root cause is when kernel pf generate DPDK vf reset event, the
> > flag
> > vf->promisc_unicast_enabled will not be cleared but promiscuous mode
> > is
> > disabled. When trying to enable promiscuous mode next time by calling
> > i40evf_dev_promiscuous_enable won't work because it will check the
> > vf->promisc_unicast_enabled flag first.
> >
> > static int
> > i40evf_dev_promiscuous_enable(struct rte_eth_dev *dev)
> > {
> > ...
> >     /* If enabled, just return */
> >     if (vf->promisc_unicast_enabled)
> >         return 0;
> > ...
> > }
> >
> > Hi Eelco,
> >
> > I think you may need add more detailed message in the commit log or
> > comments.
> 
> My interpretation of the request was that Beilei wanted to know why
> disabling promiscuous mode in HW was failing. Beilei can you comment, is
> the additional description from Xiao enough?

Yes, promisc_unicast_enabled flag is not cleared during vf reset because fail to disable promiscuous mode,
So I think we need to root cause why fail to  disable promiscuous mode first.
This patch looks like a workaround but not a fix.

> 
> >>
> >>>>> +	 * fail. This would happen when the kernel driver requires a
> >>>>> reset
> >>>>> +	 * of the VF.
> >>>>> +	 */
> >>>>> +	if (rte_eal_process_type() == RTE_PROC_PRIMARY)
> >>>>> +		vf->promisc_unicast_enabled = FALSE;
> >>>>> +
> >>>>>  	ret = i40evf_dev_init(dev);
> >>>>>
> >>>>>  	return ret;
> >>>>> --
> >>>>> 1.8.3.1



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