Re: [PATCH] net/ixgbevf: reset hardware whenstoppingport

Hi, Wenzhuo

The attachment is test report without product.

 
------------------ Original ------------------
From:  "Lu, Wenzhuo"<redacted>;
Date:  Fri, Feb 24, 2017 04:54 PM
To:  "fengtian Guo"<redacted>; "Olivier Matz"<redacted>; "dev@dpdk.org"<redacted>; "Zhang, Helin"<redacted>; "Ananyev, Konstantin"<redacted>; 
Cc:  "stable@dpdk.org"<redacted>; "David Marchand"<redacted>; 
Subject:  RE: Re:RE: [dpdk-dev] [PATCH] net/ixgbevf: reset hardware whenstoppingport

 
  
Hi Fengtian,
 
Would you like to let us know how you validate this patch? As I’ve tried just stop -> start VF  can make it work again after PF down -> up. Thanks.
 
 
 
 
    
From: fengtian.guo@6wind.com.cn [mailto:fengtian.guo@6wind.com.cn] On Behalf Of fengtian Guo
 Sent: Friday, February 24, 2017 4:47 PM
 To: Lu, Wenzhuo; Olivier Matz; dev@dpdk.org; Zhang, Helin; Ananyev, Konstantin
 Cc: stable@dpdk.org; David Marchand
 Subject: Re:RE: [dpdk-dev] [PATCH] net/ixgbevf: reset hardware when stoppingport
 
 
 
 
 
Hi, Wenzhuo
 
 Sorry, Now I just notice the email is related with me.
 
 > Seems the commit log doesn't match the code change.
 > This change cannot resolve the described problem. The problem is VF doesn't handle the PF reset event. 
 > Moving the hw_reset from close to stop doesn't help and not necessary. Because PF has already reset VF stuff during  
 > resetting itself, that's why VF not working anymore.
 
 Explain the problem of this issue.
 1) it seems VF have to call ixgbe_reset_hw() when it receive PF reset event. 
 it seems VF is client and PF is server and VF has to reset the register on his side, after PF has reset the register on his side.
 
 2) with this patch, when VF receive the event after PF is set link down, it will call ixgbe_reset_hw() in ixgbevf_dev_close().
 and we have validate this patch
 
 
 Thanks
 Fengtian
   
 
 
  
 
 
   
------------------ Original ------------------
 
   
From:  "Lu, Wenzhuo"<redacted>;
 
  
Date:  Fri, Feb 24, 2017 01:21 PM
 
  
To:  "Olivier Matz"<redacted>; "dev@dpdk.org"<redacted>; "Zhang, Helin"<redacted>; "Ananyev, Konstantin"<redacted>; 
 
  
Cc:  "Guo Fengtian"<redacted>; "stable@dpdk.org"<redacted>; "David Marchand"<redacted>; 
 
  
Subject:  RE: [dpdk-dev] [PATCH] net/ixgbevf: reset hardware when stoppingport
 
 
  
 
 
 
Hi Olivier, Fengtian,
 
 
 > -----Original Message-----
 > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Olivier Matz
 > Sent: Thursday, January 12, 2017 12:52 AM
 > To: dev@dpdk.org; Zhang, Helin; Ananyev, Konstantin
 > Cc: Guo Fengtian; stable@dpdk.org; David Marchand
 > Subject: [dpdk-dev] [PATCH] net/ixgbevf: reset hardware when stopping port
 > 
 > From: Guo Fengtian [off-list ref]
 > 
 > When PF triggers a reset, VF port must acknowledge it by calling
 > ixgbe_reset_hw().
 > 
 > Before this patch, the port link status, speed and duplex are invalid (all set
 > to 0).
 > 
 > The patch move the call to ixgbe_reset_hw() from ixgbevf_dev_close() to
 > ixgbevf_dev_stop(), so that after a port restart on the VM, the link status is
 > properly marked down, with correct speed and duplex.
 > 
 > Fixes: f0160874c041 ("ixgbe: various updates")
 > 
 > CC: stable@dpdk.org
 > Signed-off-by: Guo Fengtian [off-list ref]
 > Signed-off-by: David Marchand [off-list ref]
 > Signed-off-by: Olivier Matz [off-list ref]
 > ---
 > 
 > Hi,
 > 
 > The use case for this problem was described some time ago, see:
 > http://dpdk.org/ml/archives/dev/2015-December/030067.html
 > 
 > It is also part of 2.2 release note:
 >  http://dpdk.org/browse/dpdk/tree/doc/guides/rel_notes/release_2_2.rst#n4
 > 71
 > 
 > Regards,
 > Olivier
 Seems the commit log doesn't match the code change.
 This change cannot resolve the described problem. The problem is VF doesn't handle the PF reset event. 
 Moving the hw_reset from close to stop doesn't help and not necessary. Because PF has already reset VF stuff during  resetting itself, that's why VF not working anymore.
 
 > 
 > 
 >  drivers/net/ixgbe/ixgbe_ethdev.c | 5 +----
 >  1 file changed, 1 insertion(+), 4 deletions(-)
 > 
 > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
 > b/drivers/net/ixgbe/ixgbe_ethdev.c
 > index b7ddd4f..2d8641a 100644
 > --- a/drivers/net/ixgbe/ixgbe_ethdev.c
 > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
 > @@ -4268,6 +4268,7 @@ ixgbevf_dev_stop(struct rte_eth_dev *dev)
 >  PMD_INIT_FUNC_TRACE();
 > 
 >  ixgbevf_intr_disable(hw);
 > + ixgbe_reset_hw(hw);
 > 
 >  hw->adapter_stopped = 1;
 >  ixgbe_stop_adapter(hw);
 > @@ -4294,12 +4295,8 @@ ixgbevf_dev_stop(struct rte_eth_dev *dev)  static
 > void  ixgbevf_dev_close(struct rte_eth_dev *dev)  {
 > - struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data-
 > >dev_private);
 > -
 >  PMD_INIT_FUNC_TRACE();
 > 
 > - ixgbe_reset_hw(hw);
 > -
 >  ixgbevf_dev_stop(dev);
 > 
 >  ixgbe_dev_free_queues(dev);
 > --
 > 2.8.1