[dpdk-dev] [PATCH v3] ethdev: fix DCB config issue on ixgbe

[Thomas Monjalon]

2016-06-30 01:40, Lu, Wenzhuo:
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Lu, Wenzhuo
> > From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> > > 2016-06-23 01:04, Lu, Wenzhuo:
> > > > From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> > > > > 2016-05-06 05:33, Wenzhuo Lu:
> > > > > > +int
> > > > > > +rte_eth_dev_mq_mode_set(uint8_t port_id,
> > > > > > +			enum rte_eth_rx_mq_mode rx_mq_mode,
> > > > > > +			enum rte_eth_tx_mq_mode tx_mq_mode);
> > > > >
> > > > > I've really tried to think about it and I think it is more or less a hack.
> > > > > First, it is not explained in the doc when we should use
> > > > > rte_eth_dev_mq_mode_set() instead of a simple call to
> > > rte_eth_dev_configure().
> > > > > Second, I don't understand why having a function which configures
> > > > > the "multiqueue modes" without configuring properly RSS/VMDq/DCB.
> > > > > Last, it is said that rte_eth_dev_configure() "must be invoked
> > > > > first before any other function in the Ethernet API".
> After checking the code, Honestly I'm confused. I don't find this description.

It's in the description of rte_eth_dev_configure():
	http://dpdk.org/browse/dpdk/tree/lib/librte_ether/rte_ethdev.h#n1904

> And on the contrary, I find rte_eth_dev_info_get is always called before
> rte_eth_dev_configure. I believe it's the problem.
> As rte_eth_dev_configure is not run, rte_eth_dev_info_get cannot get the right info.
> That why I have to add a API to set the mq_mode before rte_eth_dev_info_get.
> Does that mean all the related examples are wrong? Any opinion? Thanks.

My opinion is that this area needs a good cleanup and easy API :)