Re: [dpdk-dev] [PATCH] cryptodev: fix invalid dev_id after a pmd close

[Akhil Goyal <akhil.goyal@nxp.com>]

> 
> Hi Julien
> 
> >
> > Each cryptodev are indexed with its dev_id in the global
> > rte_crypto_devices variable. nb_devs is incremented / decremented each
> > time a cryptodev is created / deleted. The goal of nb_devs is to prevent
> > the user to get an invalid dev_id.
> >
> > Let's imagine DPDK has configured N cryptodevs. If the cryptodev=1 is
> > removed at runtime, the latest cryptodev N cannot be accessible, because
> > nb_devs=N-1.
> >
> > In order to prevent this kind of behavior, let's remove the check with
> > nb_devs and iterate in all the rte_crypto_devices elements: if data is
> > not NULL, that means a valid cryptodev is available.
> >
> > Fixes: d11b0f30df88 ("cryptodev: introduce API and framework for crypto
> > devices")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Julien Meunier <julien.meunier@nokia.com>
> > ---
// snip// 

> > @@ -560,7 +570,13 @@ rte_cryptodev_get_dev_id(const char *name)
> >  uint8_t
> >  rte_cryptodev_count(void)
> >  {
> > -	return cryptodev_globals.nb_devs;
> > +	uint8_t i, dev_count = 0;
> > +
> > +	for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++)
> > +		if (cryptodev_globals.devs[i].data != NULL)
> > +			dev_count++;
> > +
> > +	return dev_count;
> >  }
> 
> Why do you want to remove the nb_devs? We can have it updated
> (incremented/decremented)
> While allocate/release of the device.
> The point is, whenever somebody call rte_cryptodev_count() it will do a lookup
> of valid data
> pointer.

Could you please do the requested change. This patch need to be integrated by this week.

Thanks.