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From: Thomas Monjalon <thomas@monjalon.net>
To: Andrew Rybchenko <arybchenko@solarflare.com>
Cc: dev@dpdk.org, gaetan.rivet@6wind.com, ophirmu@mellanox.com,
	qi.z.zhang@intel.com, ferruh.yigit@intel.com,
	ktraynor@redhat.com
Subject: Re: [dpdk-dev] [PATCH v3 4/4] eal: simplify parameters of hotplug functions
Date: Mon, 01 Oct 2018 22:03:59 +0200	[thread overview]
Message-ID: <5671799.PGEWDzNARk@xps> (raw)
In-Reply-To: <7955fa9c-21ea-295b-2c1c-5a0ab7a472c6@solarflare.com>

01/10/2018 13:26, Andrew Rybchenko:
> On 9/28/18 7:21 PM, Thomas Monjalon wrote:
> > All information about a device to probe can be grouped
> > in a common string, which is what we usually call devargs.
> > An application should not have to parse this string before
> > calling the EAL probe function.
> > And the syntax could evolve to be more complex and support
> > matching multiple devices in one string.
> > That's why the bus name and device name should be removed from
> > rte_eal_hotplug_add().
> > Instead of changing this function, a simpler one is added
> > and used in the old one, which may be deprecated later.
> >
> > When removing a device, we already know its rte_device handle
> > which can be directly passed as parameter of rte_eal_hotplug_remove().
> > If the rte_device is not known, it can be retrieved with the devargs,
> > by iterating in the device list (future RTE_DEV_FOREACH()).
> > Similarly to the probing case, a new function is added
> > and used in the old one, which may be deprecated later.
> > The new function is used in failsafe, because the replacement is easy.
> >
> > Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> 
> Minor memory leak below, when fixed:
> 
> Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>
> 
> <...>
> 
> > diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
> > index a9be58edf..b40e4c0d0 100644
> > --- a/lib/librte_eal/common/eal_common_dev.c
> > +++ b/lib/librte_eal/common/eal_common_dev.c
> > @@ -129,46 +129,57 @@ int rte_eal_dev_detach(struct rte_device *dev)
> >   
> >   int
> >   rte_eal_hotplug_add(const char *busname, const char *devname,
> > -		    const char *devargs)
> > +		    const char *drvargs)
> > +{
> > +	char *devargs = NULL;
> > +	int size, length = -1;
> > +
> > +	do { /* 2 iterations: first is to know string length */
> > +		size = length + 1;
> > +		length = snprintf(devargs, size, "%s:%s,%s", busname, devname, drvargs);
> > +		if (length >= size)
> > +			devargs = malloc(length + 1);
> > +		if (devargs == NULL)
> > +			return -ENOMEM;
> > +	} while (size == 0);
> > +
> > +	return rte_dev_probe(devargs);
> 
> I think we should free devargs after the call.

Good catch!
Will fix in v4, thank you.

  reply	other threads:[~2018-10-01 20:04 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-07 22:27 [dpdk-dev] [RFC] " Thomas Monjalon
2018-09-26 21:47 ` [dpdk-dev] [PATCH v2 0/4] eal: simplify devargs and " Thomas Monjalon
2018-09-26 21:47   ` [dpdk-dev] [PATCH v2 1/4] devargs: remove deprecated functions Thomas Monjalon
2018-09-26 21:47   ` [dpdk-dev] [PATCH v2 2/4] devargs: simplify parameters of removal function Thomas Monjalon
2018-09-27  8:24     ` Ophir Munk
2018-09-27 21:31       ` Thomas Monjalon
2018-09-26 21:47   ` [dpdk-dev] [PATCH v2 3/4] eal: remove experimental flag of hotplug functions Thomas Monjalon
2018-09-26 21:47   ` [dpdk-dev] [PATCH v2 4/4] eal: simplify parameters " Thomas Monjalon
2018-09-28 16:21 ` [dpdk-dev] [PATCH v3 0/4] eal: simplify devargs and " Thomas Monjalon
2018-09-28 16:21   ` [dpdk-dev] [PATCH v3 1/4] devargs: remove deprecated functions Thomas Monjalon
2018-10-01 11:24     ` Andrew Rybchenko
2018-10-01 17:10       ` Thomas Monjalon
2018-09-28 16:21   ` [dpdk-dev] [PATCH v3 2/4] devargs: simplify parameters of removal function Thomas Monjalon
2018-10-01 11:25     ` Andrew Rybchenko
2018-10-01 19:47       ` Thomas Monjalon
2018-09-28 16:21   ` [dpdk-dev] [PATCH v3 3/4] eal: remove experimental flag of hotplug functions Thomas Monjalon
2018-10-01 11:26     ` Andrew Rybchenko
2018-10-01 19:54       ` Thomas Monjalon
2018-10-02 10:28     ` Ferruh Yigit
2018-10-03  8:42       ` Thomas Monjalon
2018-09-28 16:21   ` [dpdk-dev] [PATCH v3 4/4] eal: simplify parameters " Thomas Monjalon
2018-10-01 11:26     ` Andrew Rybchenko
2018-10-01 20:03       ` Thomas Monjalon [this message]
2018-10-01 20:52 ` [dpdk-dev] [PATCH v4 0/4] eal: simplify devargs and " Thomas Monjalon
2018-10-01 20:52   ` [dpdk-dev] [PATCH v4 1/4] devargs: remove deprecated functions Thomas Monjalon
2018-10-01 20:52   ` [dpdk-dev] [PATCH v4 2/4] devargs: simplify parameters of removal function Thomas Monjalon
2018-10-01 20:52   ` [dpdk-dev] [PATCH v4 3/4] eal: remove experimental flag of hotplug functions Thomas Monjalon
2018-10-01 20:52   ` [dpdk-dev] [PATCH v4 4/4] eal: simplify parameters " Thomas Monjalon
2018-10-03 23:10 ` [dpdk-dev] [PATCH v5 0/5] eal: simplify devargs and " Thomas Monjalon
2018-10-03 23:10   ` [dpdk-dev] [PATCH v5 1/5] devargs: remove deprecated functions Thomas Monjalon
2018-10-04  9:19     ` Gaëtan Rivet
2018-10-03 23:10   ` [dpdk-dev] [PATCH v5 2/5] devargs: simplify parameters of removal function Thomas Monjalon
2018-10-04  9:21     ` Gaëtan Rivet
2018-10-03 23:10   ` [dpdk-dev] [PATCH v5 3/5] eal: add bus pointer in device structure Thomas Monjalon
2018-10-04  9:31     ` Gaëtan Rivet
2018-10-04  9:48       ` Thomas Monjalon
2018-10-03 23:10   ` [dpdk-dev] [PATCH v5 4/5] eal: remove experimental flag of hotplug functions Thomas Monjalon
2018-10-04  9:33     ` Gaëtan Rivet
2018-10-03 23:10   ` [dpdk-dev] [PATCH v5 5/5] eal: simplify parameters " Thomas Monjalon
2018-10-04  9:44     ` Gaëtan Rivet
2018-10-04 11:46       ` Thomas Monjalon
2018-10-04 11:51         ` Gaëtan Rivet
2018-10-07  9:32 ` [dpdk-dev] [PATCH v6 0/5] eal: simplify devargs and " Thomas Monjalon
2018-10-07  9:32   ` [dpdk-dev] [PATCH v6 1/5] devargs: remove deprecated functions Thomas Monjalon
2018-10-07  9:32   ` [dpdk-dev] [PATCH v6 2/5] devargs: simplify parameters of removal function Thomas Monjalon
2018-10-07  9:32   ` [dpdk-dev] [PATCH v6 3/5] eal: add bus pointer in device structure Thomas Monjalon
2018-10-07  9:32   ` [dpdk-dev] [PATCH v6 4/5] eal: remove experimental flag of hotplug functions Thomas Monjalon
2018-10-07  9:32   ` [dpdk-dev] [PATCH v6 5/5] eal: simplify parameters " Thomas Monjalon
2018-10-08 21:45   ` [dpdk-dev] [PATCH v6 0/5] eal: simplify devargs and " Stephen Hemminger
2018-10-11 12:10     ` Thomas Monjalon

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