Re: [dpdk-dev] [PATCH v6 1/4] lib/librte_ether: support device reset

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

On Wed, Jun 22, 2016 at 05:05:14AM +0000, Lu, Wenzhuo wrote:
> 
> 
> > -----Original Message-----
> > From: Jerin Jacob [mailto:jerin.jacob@caviumnetworks.com]
> > Sent: Wednesday, June 22, 2016 12:15 PM
> > To: Lu, Wenzhuo
> > Cc: Ananyev, Konstantin; Stephen Hemminger; dev@dpdk.org; Richardson,
> > Bruce; Chen, Jing D; Liang, Cunming; Wu, Jingjing; Zhang, Helin;
> > thomas.monjalon@6wind.com
> > Subject: Re: [dpdk-dev] [PATCH v6 1/4] lib/librte_ether: support device reset
> > 
> > On Wed, Jun 22, 2016 at 03:32:16AM +0000, Lu, Wenzhuo wrote:
> > > Lost here. I think these RTE_ETH_EVENTs are used to connect the APP call
> > back functions with the events.
> > > Actually I want the APP to register a callback function reset_event_callback for
> > the reset event. Like this,
> > > 		/* register reset interrupt callback */
> > > 		rte_eth_dev_callback_register(portid,
> > > 			RTE_ETH_EVENT_INTR_RESET, reset_event_callback,
> > NULL); And when the
> > > VF driver finds PF link down/up, it  should  use
> > _rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_RESET) to run into
> > the callback which is provided by APP. Means reset_event_callback here.
> > 
> > me too. Their is existing RTE_ETH_EVENT_INTR_RESET event to notify the PF
> > reset.I guess it is not for the PF link change or it isfor generic VF reset request
> > initiated by PF for everything.
> I think this event is for device reset not only for PF but also can for VF. I think we can use this event when the driver want the APP to reset the device. The PF link down/up caused VF reset is one of the cases.

Then please correct description for the RTE_ETH_EVENT_INTR_RESET
in lib/librte_ether/rte_ethdev.h
"/**< reset interrupt event, sent to VF on PF reset */"

> 
> > 
> > file: lib/librte_ether/rte_ethdev.h
> >         RTE_ETH_EVENT_INTR_RESET,
> > 		/**< reset interrupt event, sent to VF on PF reset */
> >                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> > if application need to call rte_ethdev_reset() on  RTE_ETH_EVENT_INTR_RESET
> > event then please mention it commit log or API description.
> Good suggestion. I'll try to find where's the good place to add more explanation.

I guess then reset API can be changed to rte_ethdev_process_reset_intr() or
similar to reflect the use case(API called by application on reset event from PF)

The PMDs were PF does not generate the RTE_ETH_EVENT_INTR_RESET to VF
then VF's reset PMD callback shall be a 'nop'

Jerin

> > 
>