Re: [dpdk-dev] [PATCH] e1000: fix setting of VF MAC address

["Iremonger, Bernard" <bernard.iremonger@intel.com>]

Hi Wenzhuo,

> -----Original Message-----
> From: Lu, Wenzhuo
> Sent: Thursday, March 3, 2016 2:34 AM
> To: Iremonger, Bernard <bernard.iremonger@intel.com>; dev@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH] e1000: fix setting of VF MAC address
> 
> Hi Bernard,
> 
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Bernard
> Iremonger
> > Sent: Thursday, March 3, 2016 12:09 AM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] [PATCH] e1000: fix setting of VF MAC address
> >
> > Allow reprogramming of the RAR with a zero mac address, to ensure that
> > the VF traffic goes to the PF after stop, close and detach of the VF.
> >
> > Fixes: be2d648a2dd3 ("igb: add PF support")
> > Fixes: d82170d27918 ("igb: add VF support")
> > Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
> > ---
> >  drivers/net/e1000/igb_ethdev.c | 12 +++++++++++-
> >  drivers/net/e1000/igb_pf.c     |  8 +++++---
> >  2 files changed, 16 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/e1000/igb_ethdev.c
> > b/drivers/net/e1000/igb_ethdev.c index 4ed5e95..f1044b7 100644
> > --- a/drivers/net/e1000/igb_ethdev.c
> > +++ b/drivers/net/e1000/igb_ethdev.c
> > @@ -1,7 +1,7 @@
> >  /*-
> >   *   BSD LICENSE
> >   *
> > - *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
> > + *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
> >   *   All rights reserved.
> >   *
> >   *   Redistribution and use in source and binary forms, with or without
> > @@ -2819,6 +2819,7 @@ igbvf_dev_close(struct rte_eth_dev *dev)
> >  	struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data-
> > >dev_private);
> >  	struct e1000_adapter *adapter =
> >  		E1000_DEV_PRIVATE(dev->data->dev_private);
> > +	struct ether_addr addr;
> >
> >  	PMD_INIT_FUNC_TRACE();
> >
> > @@ -2827,6 +2828,15 @@ igbvf_dev_close(struct rte_eth_dev *dev)
> >  	igbvf_dev_stop(dev);
> >  	adapter->stopped = 1;
> >  	igb_dev_free_queues(dev);
> > +
> > +	/**
> > +	 * reprogram the RAR with a zero mac address,
> > +	 * to ensure that the VF traffic goes to the PF
> > +	 * after stop, close and detach of the VF.
> > +	 **/
> > +
> > +	memset(&addr, 0, sizeof(addr));
> > +	igbvf_default_mac_addr_set(dev, &addr);
> >  }
> >
> >  static int igbvf_set_vfta(struct e1000_hw *hw, uint16_t vid, bool on)
> > diff --git a/drivers/net/e1000/igb_pf.c b/drivers/net/e1000/igb_pf.c
> > index
> > 1d00dda..95204e9 100644
> > --- a/drivers/net/e1000/igb_pf.c
> > +++ b/drivers/net/e1000/igb_pf.c
> > @@ -1,7 +1,7 @@
> >  /*-
> >   *   BSD LICENSE
> >   *
> > - *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
> > + *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
> >   *   All rights reserved.
> >   *
> >   *   Redistribution and use in source and binary forms, with or without
> > @@ -332,8 +332,10 @@ igb_vf_set_mac_addr(struct rte_eth_dev *dev,
> > uint32_t vf, uint32_t *msgbuf)
> >  	int rar_entry = hw->mac.rar_entry_count - (vf + 1);
> >  	uint8_t *new_mac = (uint8_t *)(&msgbuf[1]);
> >
> > -	if (is_valid_assigned_ether_addr((struct ether_addr*)new_mac)) {
> > -		rte_memcpy(vfinfo[vf].vf_mac_addresses, new_mac, 6);
> > +	if (is_unicast_ether_addr((struct ether_addr *)new_mac)) {
> > +		if (!is_zero_ether_addr((struct ether_addr *)new_mac))
> > +			rte_memcpy(vfinfo[vf].vf_mac_addresses,
> new_mac,
> > +				sizeof(vfinfo[vf].vf_mac_addresses));
> >  		hw->mac.ops.rar_set(hw, new_mac, rar_entry);
> If the new mac is 0, after this, the rar is 0, but the address stored in vfinfo is
> not changed and surely not 0. Right?
> So, they're not align with each other. Could it cause some problem?
> 
> >  		return 0;
> >  	}
> > --
> > 2.6.3

 vfinfo[vf].vf_mac_addresses  contains the perm_addr MAC address.
I do not want to overwrite this with a zero address. If the VF is attached again it uses the perm_addr  MAC address.
The follow sequence works fine for me in testpmd, the VF is port 1:

Testpmd> port stop 1
Testpmd> port close 1 		/* VF MAC address is set to zero here */
Testpmd> port detach 1
Testpmd> port attach 0000:04:10.0  
Testpmd> show port info 1	/* VF MAC address is perm_addr MAC address */

Regards,

Bernard.