[PATCH 5/7] net/nfp: fix resource leak for exit of CoreNIC firmware

[Chaoyong He]

> On 11/30/2023 8:52 AM, Chaoyong He wrote:
> > Fix the resource leak problem in the exit logic of CoreNIC firmware.
> >
> > Fixes: 646ea79ce481 ("net/nfp: move PF functions into its own file")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Chaoyong He <chaoyong.he at corigine.com>
> > Reviewed-by: Long Wu <long.wu at corigine.com>
> > Reviewed-by: Peng Zhang <peng.zhang at corigine.com>
> 
> <...>
> 
> > +static int
> > +nfp_pf_secondary_uninit(struct nfp_pf_dev *pf_dev) {
> > +	free(pf_dev->sym_tbl);
> > +	rte_free(pf_dev);
> > +
> > +	return 0;
> > +}
> > +
> >  /* Reset and stop device. The device can not be restarted. */  static
> > int  nfp_net_close(struct rte_eth_dev *dev) @@ -333,14 +381,25 @@
> > nfp_net_close(struct rte_eth_dev *dev)
> >  	struct rte_pci_device *pci_dev;
> >  	struct nfp_app_fw_nic *app_fw_nic;
> >
> > -	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> > -		return 0;
> > -
> >  	hw = dev->data->dev_private;
> >  	pf_dev = hw->pf_dev;
> >  	pci_dev = RTE_ETH_DEV_TO_PCI(dev);
> >  	app_fw_nic = NFP_PRIV_TO_APP_FW_NIC(pf_dev->app_fw_priv);
> >
> > +	/*
> > +	 * In secondary process, a released eth device can be found by its
> name
> > +	 * in shared memory.
> > +	 * If the state of the eth device is RTE_ETH_DEV_UNUSED, it means the
> > +	 * eth device has been released.
> > +	 */
> > +	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
> > +		if (dev->state == RTE_ETH_DEV_UNUSED)
> > +			return 0;
> > +
> > +		nfp_pf_secondary_uninit(pf_dev);
> > +		return 0;
> > +	}
> > +
> >
> 
> Mostly expectation is secondary process doesn't free shared resources, but
> init and free done by primary process.

I agree.
Maybe the comment here make reader a little confused.
But the `nfp_pf_secondary_uninit()` does not free any shared resources, it only free two memory which private to each secondary process.

> When there are multiple secondaries active, and if one of them closes the port,
> will system behave properly? Can you please double check above logic?

Yes, the system behave properly.