Re: [dpdk-dev] [PATCH] net/ixgbe: clean up rte_eth_dev_info_get

[Tiwei Bie <tiwei.bie@intel.com>]

On Wed, Jan 25, 2017 at 01:13:32PM +0800, Lu, Wenzhuo wrote:
> Hi Tiwei,
> 
> > -----Original Message-----
> > From: Bie, Tiwei
> > Sent: Wednesday, January 25, 2017 11:17 AM
> > To: Lu, Wenzhuo
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] net/ixgbe: clean up rte_eth_dev_info_get
> > 
> > On Wed, Jan 25, 2017 at 10:39:22AM +0800, Wenzhuo Lu wrote:
> > > It'not appropriate to call rte_eth_dev_info_get in PMD, as
> > > rte_eth_dev_info_get need to get info from PMD.
> > > Remove rte_eth_dev_info_get from PMD code and get the info directly.
> > >
> > > Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
> > > ---
> > >  drivers/net/ixgbe/ixgbe_ethdev.c | 144
> > > ++++++++++++++++++---------------------
> > >  1 file changed, 68 insertions(+), 76 deletions(-)
> > >
> > > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
> > > b/drivers/net/ixgbe/ixgbe_ethdev.c
> > > index 64ce55a..f14a68b 100644
> > > --- a/drivers/net/ixgbe/ixgbe_ethdev.c
> > > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
> > > @@ -4401,17 +4401,17 @@ static int
> > ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
> > >  	int rar_entry;
> > >  	uint8_t *new_mac = (uint8_t *)(mac_addr);
> > >  	struct rte_eth_dev *dev;
> > > -	struct rte_eth_dev_info dev_info;
> > > +	struct rte_pci_device *pci_dev;
> > >
> > >  	RTE_ETH_VALID_PORTID_OR_ERR_RET(port, -ENODEV);
> > >
> > >  	dev = &rte_eth_devices[port];
> > > -	rte_eth_dev_info_get(port, &dev_info);
> > > +	pci_dev = IXGBE_DEV_TO_PCI(dev);
> > >
> > > -	if (is_ixgbe_pmd(dev_info.driver_name) != 0)
> > > +	if (is_ixgbe_pmd(dev->data->drv_name))
> > >  		return -ENOTSUP;
> > >
> > 
> > The return value of is_ixgbe_pmd() is not boolean (actually I think it should be
> > based on its name). If we omit the comparison with 0, the code looks weird. It
> > looks like it'll return -ENOTSUP if the port's driver is ixgbe PMD.
> 
> Yes, it’s weird. But what makes it weird is not the missing comparison but the function name.
> Better changing it to ixgbe_pmd_check. How about it?
> 

Yeah, I also prefer to change the helper function itself. But I'm not
good at the naming. I'd like to hear others' opinion. :-)

Best regards,
Tiwei Bie