Re: [PATCH v7 net-next 2/4] net: Introduce generic failover module

["Samudrala, Sridhar" <sridhar.samudrala@intel.com>]

On 4/22/2018 10:06 AM, Michael S. Tsirkin wrote:
> On Thu, Apr 19, 2018 at 06:42:02PM -0700, Sridhar Samudrala wrote:
> > +#if IS_ENABLED(CONFIG_NET_FAILOVER)
> > +
> > +int failover_create(struct net_device *standby_dev,
> > +		    struct failover **pfailover);
> Should we rename all these structs net_failover?
> It's possible to extend the concept to storage I think.

We could, the only downside is that the names become longer. i think we need
to change the filenames and the function names also to be consistent.


> > +void failover_destroy(struct failover *failover);
> > +
> > +int failover_register(struct net_device *standby_dev, struct failover_ops *ops,
> > +		      struct failover **pfailover);
> > +void failover_unregister(struct failover *failover);
> > +
> > +int failover_slave_unregister(struct net_device *slave_dev);
> > +
> > +#else
> > +
> > +static inline
> > +int failover_create(struct net_device *standby_dev,
> > +		    struct failover **pfailover);
> > +{
> > +	return 0;
> Does this make callers do something sane?
> Shouldn't these return an error?

Yes. i think i should return -EOPNOTSUPP here, so that we fail
when CONFIG_NET_FAILOVER is not enabled and the virtio-net driver is trying
to create a failover device.


> > +}
> > +
> > +static inline
> > +void failover_destroy(struct failover *failover)
> > +{
> > +}
> > +
> > +static inline
> > +int failover_register(struct net_device *standby_dev, struct failover_ops *ops,
> > +		      struct pfailover **pfailover);
> > +{
> > +	return 0;
> > +}
> struct pfailover seems like a typo.

yes. will also change the return to -EOPNOTSUPP

> > +
> > +static inline
> > +void failover_unregister(struct failover *failover)
> > +{
> > +}
> > +
> > +static inline
> > +int failover_slave_unregister(struct net_device *slave_dev)
> > +{
> > +	return 0;
> > +}
> Does anyone test return value of unregister?
> should this be void?

yes. can be changed to void.


> > +
> > +#endif
> > +
> > +#endif /* _NET_FAILOVER_H */