[PATCH v1 2/2] examples/multi_process: fix memory leak

[Wu, Wenjun1]

Hi Chengwen,

Thanks for reviewing.
The memory leak occurs similar as what mentioned in https://patches.dpdk.org/project/dpdk/patch/20230705092511.362484-2-wenjun1.wu@intel.com/.
I will perfect the commit description in V2 version.

Thanks,
Wenjun

> -----Original Message-----
> From: fengchengwen <fengchengwen at huawei.com>
> Sent: Thursday, July 6, 2023 9:02 AM
> To: Wu, Wenjun1 <wenjun1.wu at intel.com>; dev at dpdk.org; Burakov,
> Anatoly <anatoly.burakov at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>
> Cc: Su, Simei <simei.su at intel.com>; stable at dpdk.org
> Subject: Re: [PATCH v1 2/2] examples/multi_process: fix memory leak
> 
> On 2023/7/5 17:25, Wenjun Wu wrote:
> > The device should be detached before quit, otherwise it will cause
> > memory leak.
> 
> Which memory will leak?
> 
> For mp, if secondary process quit, it only needs to properly handle the
> memory shared with other process.
> 
> >
> > Fixes: 05f1d6842fc3 ("examples/multi_process: add hotplug sample")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Wenjun Wu <wenjun1.wu at intel.com>
> > ---
> >  examples/multi_process/hotplug_mp/commands.c | 22
> > ++++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> >
> > diff --git a/examples/multi_process/hotplug_mp/commands.c
> > b/examples/multi_process/hotplug_mp/commands.c
> > index 88f44e00a0..143d57eeb6 100644
> > --- a/examples/multi_process/hotplug_mp/commands.c
> > +++ b/examples/multi_process/hotplug_mp/commands.c
> > @@ -52,6 +52,28 @@ static void cmd_quit_parsed(__rte_unused void
> *parsed_result,
> >  			    struct cmdline *cl,
> >  			    __rte_unused void *data)
> >  {
> > +	uint16_t port_id;
> > +	char dev_name[RTE_DEV_NAME_MAX_LEN];
> > +	struct rte_devargs da;
> > +
> > +	RTE_ETH_FOREACH_DEV(port_id) {
> > +		rte_eth_dev_get_name_by_port(port_id, dev_name);
> > +		memset(&da, 0, sizeof(da));
> > +
> > +		if (rte_devargs_parsef(&da, "%s", dev_name)) {
> > +			cmdline_printf(cl,
> > +				       "cannot parse devargs for device %s\n",
> > +				       dev_name);
> > +		}
> > +		printf("detaching before quit...\n");
> > +		if (!rte_eal_hotplug_remove(rte_bus_name(da.bus),
> da.name))
> > +			cmdline_printf(cl, "detached device %s\n",
> > +				da.name);
> > +		else
> > +			cmdline_printf(cl, "failed to detach device %s\n",
> > +				da.name);
> > +
> > +	}
> >  	cmdline_quit(cl);
> >  }
> >
> >