[dpdk-dev] [PATCH v2] e1000: configure VLAN TPID

Xing, Beilei beilei.xing at intel.com
Thu Jun 16 03:40:06 CEST 2016


Hi Bruce,

> -----Original Message-----
> From: Richardson, Bruce
> Sent: Wednesday, June 15, 2016 7:04 PM
> To: Xing, Beilei <beilei.xing at intel.com>
> Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2] e1000: configure VLAN TPID
> 
> On Fri, Jun 03, 2016 at 10:59:15AM +0800, Beilei Xing wrote:
> > This patch enables configuring the ether types of both inner and outer
> > VLANs. Note that outer TPID of single VLAN and inner TPID of double
> > VLAN are read only.
> >
> 
> Commit message does not actually match the code, and I there is something
> very strange about the code, see my comments below.
> 
> > Signed-off-by: Beilei Xing <beilei.xing at intel.com>
> > ---
> > v2 changes:
> >  Modify return value. Cause inner tpid is not supported by single
> > vlan,  return -ENOTSUP.
> >  Add return value. If want to set inner TPID of double vlan or set
> > outer  tpid of single vlan, return -ENOTSUP.
> >
> >  drivers/net/e1000/igb_ethdev.c | 38
> > +++++++++++++++++++++++++++++++++++---
> >  1 file changed, 35 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/e1000/igb_ethdev.c
> > b/drivers/net/e1000/igb_ethdev.c index f0921ee..5d37e2c 100644
> > --- a/drivers/net/e1000/igb_ethdev.c
> > +++ b/drivers/net/e1000/igb_ethdev.c
> > @@ -86,6 +86,14 @@
> >  #define E1000_INCVALUE_82576         (16 << IGB_82576_TSYNC_SHIFT)
> >  #define E1000_TSAUXC_DISABLE_SYSTIME 0x80000000
> >
> > +/* CTRL_EXT bit mask*/
> > +#define E1000_CTRL_EXT_EXT_VLAN      (1 << 26)
> > +
> > +/* VLAN Ether Type bit mask */
> > +#define E1000_VET_VET_EXT            0xFFFF0000
> > +
> 
> No need for a blank line here. Update the comment above to refer to both
> mask and shift values and put them on one line after the other.

OK, I'll delete the blank line in next version.

> 
> > +#define E1000_VET_VET_EXT_SHIFT      16
> > +
> >  static int  eth_igb_configure(struct rte_eth_dev *dev);  static int
> > eth_igb_start(struct rte_eth_dev *dev);  static void
> > eth_igb_stop(struct rte_eth_dev *dev); @@ -2237,13 +2245,37 @@
> > eth_igb_vlan_tpid_set(struct rte_eth_dev *dev,  {
> >  	struct e1000_hw *hw =
> >  		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> > -	uint32_t reg = ETHER_TYPE_VLAN;
> > +	uint32_t reg;
> > +	uint32_t qinq;
> >  	int ret = 0;
> >
> > +	qinq = E1000_READ_REG(hw, E1000_CTRL_EXT);
> > +	qinq &= E1000_CTRL_EXT_EXT_VLAN;
> > +
> >  	switch (vlan_type) {
> >  	case ETH_VLAN_TYPE_INNER:
> > -		reg |= (tpid << 16);
> > -		E1000_WRITE_REG(hw, E1000_VET, reg);
> > +		if (qinq) {
> > +			ret = -ENOTSUP;
> > +			PMD_DRV_LOG(WARNING,
> > +				    "Inner vlan ether type is read-only\n");
> > +		} else {
> > +			ret = -ENOTSUP;
> > +			PMD_DRV_LOG(ERR, "Inner type is not supported"
> > +				    " by single vlan\n");
> > +		}
> > +		break;
> 
> Both branches of the if statment return -ENOTSUP and do not do anything to
> set any VLAN parameters. This means that although we have the ability to
> set the outer vlan, we can no longer set the inner type. This contradicts what
> the commit message says.

Yes, actually inner VLAN couldn't be changed.

> 
> > +	case ETH_VLAN_TYPE_OUTER:
> > +		if (qinq) {
> > +			reg = E1000_READ_REG(hw, E1000_VET);
> > +			reg = (reg & (~E1000_VET_VET_EXT)) |
> > +				((uint32_t)tpid <<
> E1000_VET_VET_EXT_SHIFT);
> > +			E1000_WRITE_REG(hw, E1000_VET, reg);
> > +		} else {
> > +			ret = -ENOTSUP;
> > +			PMD_DRV_LOG(WARNING,
> > +				    "Single vlan ether type is read-only\n");
> > +		}
> > +
> 
> So according to the code, the only time you can change a vlan ether type is to
> set the outer type for qinq? If this is the correct behaviour, please update
> the commit title and message accordingly.

Yes,  you're right, thanks for all your comments.

> 
> >  		break;
> >  	default:
> >  		ret = -EINVAL;
> > --
> > 2.5.0
> >
> 
> Regards,
> /Bruce


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