diff mbox series

[2/2] net/vhost: prevent multiple setup on reconfig

Message ID 20200218172240.558516-3-maxime.coquelin@redhat.com (mailing list archive)
State Accepted, archived
Delegated to: Maxime Coquelin
Headers
Series Fix Vhost PMD setup |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail apply issues
ci/travis-robot warning Travis build: failed

Commit Message

Maxime Coquelin Feb. 18, 2020, 5:22 p.m. UTC 
  Ethdev's .dev_configure callback can be called multiple
time during a device life-time, but Vhost makes the
wrong assumption that it is not the case and try to
setup again the device on reconfiguration.

This patch ensures the device hasn't been already setup
before proceeding.

Fixes: 3d01b759d267 ("net/vhost: delay driver setup")

Reported-by: Yinan Wang <yinan.wang@intel.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Tested-by: Yinan Wang <yinan.wang@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Tiwei Bie Feb. 19, 2020, 3:44 a.m. UTC | #1 
On Tue, Feb 18, 2020 at 06:22:40PM +0100, Maxime Coquelin wrote:
> Ethdev's .dev_configure callback can be called multiple
> time during a device life-time, but Vhost makes the
> wrong assumption that it is not the case and try to
> setup again the device on reconfiguration.
> 
> This patch ensures the device hasn't been already setup
> before proceeding.
> 
> Fixes: 3d01b759d267 ("net/vhost: delay driver setup")
> 
> Reported-by: Yinan Wang <yinan.wang@intel.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> Tested-by: Yinan Wang <yinan.wang@intel.com>
> Reviewed-by: David Marchand <david.marchand@redhat.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
> index 4a7b1b608c..458ed58f5f 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -876,6 +876,11 @@ vhost_driver_setup(struct rte_eth_dev *eth_dev)
>  	unsigned int numa_node = eth_dev->device->numa_node;
>  	const char *name = eth_dev->device->name;
>  
> +	/* Don't try to setup again if it has already been done. */
> +	list = find_internal_resource(internal->iface_name);
> +	if (list)
> +		return 0;
> +
>  	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
>  	if (list == NULL)
>  		return -1;
> -- 
> 2.24.1

Thanks Maxime for the fix!

Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>

Not related to this fix, it seems there is a potential leak after
delaying the driver setup to _configure, as the list won't be
registered until users configure the device. So internal->iface_name
allocated in _create will leak if the device is released without
doing _configure first.

https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1058
https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1075

It's not a common case and it's quite late in this release,
probably it's fine to fix it later.

Thanks,
Tiwei
Maxime Coquelin Feb. 19, 2020, 8:17 a.m. UTC | #2 
Hi Tiwei,

On 2/19/20 4:44 AM, Tiwei Bie wrote:
> On Tue, Feb 18, 2020 at 06:22:40PM +0100, Maxime Coquelin wrote:
>> Ethdev's .dev_configure callback can be called multiple
>> time during a device life-time, but Vhost makes the
>> wrong assumption that it is not the case and try to
>> setup again the device on reconfiguration.
>>
>> This patch ensures the device hasn't been already setup
>> before proceeding.
>>
>> Fixes: 3d01b759d267 ("net/vhost: delay driver setup")
>>
>> Reported-by: Yinan Wang <yinan.wang@intel.com>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> Tested-by: Yinan Wang <yinan.wang@intel.com>
>> Reviewed-by: David Marchand <david.marchand@redhat.com>
>> ---
>>  drivers/net/vhost/rte_eth_vhost.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
>> index 4a7b1b608c..458ed58f5f 100644
>> --- a/drivers/net/vhost/rte_eth_vhost.c
>> +++ b/drivers/net/vhost/rte_eth_vhost.c
>> @@ -876,6 +876,11 @@ vhost_driver_setup(struct rte_eth_dev *eth_dev)
>>  	unsigned int numa_node = eth_dev->device->numa_node;
>>  	const char *name = eth_dev->device->name;
>>  
>> +	/* Don't try to setup again if it has already been done. */
>> +	list = find_internal_resource(internal->iface_name);
>> +	if (list)
>> +		return 0;
>> +
>>  	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
>>  	if (list == NULL)
>>  		return -1;
>> -- 
>> 2.24.1
> 
> Thanks Maxime for the fix!
> 
> Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
> 
> Not related to this fix, it seems there is a potential leak after
> delaying the driver setup to _configure, as the list won't be
> registered until users configure the device. So internal->iface_name
> allocated in _create will leak if the device is released without
> doing _configure first.
> 
> https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1058
> https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1075
> 
> It's not a common case and it's quite late in this release,
> probably it's fine to fix it later.

That's a valid point, and I also agree there is no urgency for v20.02.
Itsuro, would you take care of fixing it for v20.05?

Thanks,
Maxime
> Thanks,
> Tiwei
>
Itsuro Oda Feb. 19, 2020, 10:17 p.m. UTC | #3 
Hi Maxime, Tiewi,

On Wed, 19 Feb 2020 09:17:41 +0100
Maxime Coquelin <maxime.coquelin@redhat.com> wrote:

> Hi Tiwei,
> 
> On 2/19/20 4:44 AM, Tiwei Bie wrote:
> > On Tue, Feb 18, 2020 at 06:22:40PM +0100, Maxime Coquelin wrote:
> >> Ethdev's .dev_configure callback can be called multiple
> >> time during a device life-time, but Vhost makes the
> >> wrong assumption that it is not the case and try to
> >> setup again the device on reconfiguration.
> >>
> >> This patch ensures the device hasn't been already setup
> >> before proceeding.
> >>
> >> Fixes: 3d01b759d267 ("net/vhost: delay driver setup")
> >>
> >> Reported-by: Yinan Wang <yinan.wang@intel.com>
> >> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> Tested-by: Yinan Wang <yinan.wang@intel.com>
> >> Reviewed-by: David Marchand <david.marchand@redhat.com>
> >> ---
> >>  drivers/net/vhost/rte_eth_vhost.c | 5 +++++
> >>  1 file changed, 5 insertions(+)
> >>
> >> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
> >> index 4a7b1b608c..458ed58f5f 100644
> >> --- a/drivers/net/vhost/rte_eth_vhost.c
> >> +++ b/drivers/net/vhost/rte_eth_vhost.c
> >> @@ -876,6 +876,11 @@ vhost_driver_setup(struct rte_eth_dev *eth_dev)
> >>  	unsigned int numa_node = eth_dev->device->numa_node;
> >>  	const char *name = eth_dev->device->name;
> >>  
> >> +	/* Don't try to setup again if it has already been done. */
> >> +	list = find_internal_resource(internal->iface_name);
> >> +	if (list)
> >> +		return 0;
> >> +
> >>  	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
> >>  	if (list == NULL)
> >>  		return -1;
> >> -- 
> >> 2.24.1
> > 
> > Thanks Maxime for the fix!
> > 
> > Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
> > 
> > Not related to this fix, it seems there is a potential leak after
> > delaying the driver setup to _configure, as the list won't be
> > registered until users configure the device. So internal->iface_name
> > allocated in _create will leak if the device is released without
> > doing _configure first.
> > 
> > https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1058
> > https://github.com/DPDK/dpdk/blob/e6c78e736d77/drivers/net/vhost/rte_eth_vhost.c#L1075
> > 
> > It's not a common case and it's quite late in this release,
> > probably it's fine to fix it later.
> 
> That's a valid point, and I also agree there is no urgency for v20.02.
> Itsuro, would you take care of fixing it for v20.05?

Sure, I will do it.

Thanks.
Itsuro Oda

> Thanks,
> Maxime
> > Thanks,
> > Tiwei
> >
diff mbox series

Patch

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 4a7b1b608c..458ed58f5f 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -876,6 +876,11 @@  vhost_driver_setup(struct rte_eth_dev *eth_dev)
 	unsigned int numa_node = eth_dev->device->numa_node;
 	const char *name = eth_dev->device->name;
 
+	/* Don't try to setup again if it has already been done. */
+	list = find_internal_resource(internal->iface_name);
+	if (list)
+		return 0;
+
 	list = rte_zmalloc_socket(name, sizeof(*list), 0, numa_node);
 	if (list == NULL)
 		return -1;