* [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
@ 2019-03-13 2:12 Stephen Hemminger
2019-03-14 11:13 ` Matan Azrad
0 siblings, 1 reply; 9+ messages in thread
From: Stephen Hemminger @ 2019-03-13 2:12 UTC (permalink / raw)
To: matan; +Cc: dev, Stephen Hemminger
The return value from bus->find_device is a rte_device
which is not safe to cast to a rte_vdev_device structure.
It doesn't really matter since only being checked for NULL
but static checkers might find a bug here.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c b/drivers/net/vdev_netvsc/vdev_netvsc.c
index ba63fac2a598..801f54c96e01 100644
--- a/drivers/net/vdev_netvsc/vdev_netvsc.c
+++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
@@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct rte_device *dev1,
static void
vdev_netvsc_scan_callback(__rte_unused void *arg)
{
- struct rte_vdev_device *dev;
+ struct rte_device *dev;
struct rte_devargs *devargs;
struct rte_bus *vbus = rte_bus_find_by_name("vdev");
@@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void *arg)
if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
VDEV_NETVSC_DRIVER_NAME_LEN))
return;
- dev = (struct rte_vdev_device *)vbus->find_device(NULL,
- vdev_netvsc_cmp_rte_device, VDEV_NETVSC_DRIVER_NAME);
+
+ dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
+ VDEV_NETVSC_DRIVER_NAME);
if (dev)
return;
if (rte_devargs_add(RTE_DEVTYPE_VIRTUAL, VDEV_NETVSC_DRIVER_NAME))
--
2.17.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-13 2:12 [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast Stephen Hemminger
@ 2019-03-14 11:13 ` Matan Azrad
2019-03-14 11:13 ` Matan Azrad
2019-03-14 15:44 ` Stephen Hemminger
0 siblings, 2 replies; 9+ messages in thread
From: Matan Azrad @ 2019-03-14 11:13 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: dev
Hi
From: Stephen Hemminger
> The return value from bus->find_device is a rte_device which is not safe to
> cast to a rte_vdev_device structure.
> It doesn't really matter since only being checked for NULL but static checkers
> might find a bug here.
>
Fix line is missing.
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> b/drivers/net/vdev_netvsc/vdev_netvsc.c
> index ba63fac2a598..801f54c96e01 100644
> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> rte_device *dev1, static void vdev_netvsc_scan_callback(__rte_unused
> void *arg) {
> - struct rte_vdev_device *dev;
> + struct rte_device *dev;
> struct rte_devargs *devargs;
> struct rte_bus *vbus = rte_bus_find_by_name("vdev");
>
> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void *arg)
> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> VDEV_NETVSC_DRIVER_NAME_LEN))
> return;
> - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> - vdev_netvsc_cmp_rte_device,
> VDEV_NETVSC_DRIVER_NAME);
> +
> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> + VDEV_NETVSC_DRIVER_NAME);
Since the device must be vdev here,
It is better to use explicit cast to make the checker happy.
> if (dev)
> return;
> if (rte_devargs_add(RTE_DEVTYPE_VIRTUAL,
> VDEV_NETVSC_DRIVER_NAME))
> --
> 2.17.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-14 11:13 ` Matan Azrad
@ 2019-03-14 11:13 ` Matan Azrad
2019-03-14 15:44 ` Stephen Hemminger
1 sibling, 0 replies; 9+ messages in thread
From: Matan Azrad @ 2019-03-14 11:13 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: dev
Hi
From: Stephen Hemminger
> The return value from bus->find_device is a rte_device which is not safe to
> cast to a rte_vdev_device structure.
> It doesn't really matter since only being checked for NULL but static checkers
> might find a bug here.
>
Fix line is missing.
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> b/drivers/net/vdev_netvsc/vdev_netvsc.c
> index ba63fac2a598..801f54c96e01 100644
> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> rte_device *dev1, static void vdev_netvsc_scan_callback(__rte_unused
> void *arg) {
> - struct rte_vdev_device *dev;
> + struct rte_device *dev;
> struct rte_devargs *devargs;
> struct rte_bus *vbus = rte_bus_find_by_name("vdev");
>
> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void *arg)
> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> VDEV_NETVSC_DRIVER_NAME_LEN))
> return;
> - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> - vdev_netvsc_cmp_rte_device,
> VDEV_NETVSC_DRIVER_NAME);
> +
> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> + VDEV_NETVSC_DRIVER_NAME);
Since the device must be vdev here,
It is better to use explicit cast to make the checker happy.
> if (dev)
> return;
> if (rte_devargs_add(RTE_DEVTYPE_VIRTUAL,
> VDEV_NETVSC_DRIVER_NAME))
> --
> 2.17.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-14 11:13 ` Matan Azrad
2019-03-14 11:13 ` Matan Azrad
@ 2019-03-14 15:44 ` Stephen Hemminger
2019-03-14 15:44 ` Stephen Hemminger
2019-03-17 6:16 ` Matan Azrad
1 sibling, 2 replies; 9+ messages in thread
From: Stephen Hemminger @ 2019-03-14 15:44 UTC (permalink / raw)
To: Matan Azrad; +Cc: dev
On Thu, 14 Mar 2019 11:13:10 +0000
Matan Azrad <matan@mellanox.com> wrote:
> Hi
>
> From: Stephen Hemminger
> > The return value from bus->find_device is a rte_device which is not safe to
> > cast to a rte_vdev_device structure.
> > It doesn't really matter since only being checked for NULL but static checkers
> > might find a bug here.
> >
>
> Fix line is missing.
>
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> > drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> > 1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > index ba63fac2a598..801f54c96e01 100644
> > --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> > rte_device *dev1, static void vdev_netvsc_scan_callback(__rte_unused
> > void *arg) {
> > - struct rte_vdev_device *dev;
> > + struct rte_device *dev;
> > struct rte_devargs *devargs;
> > struct rte_bus *vbus = rte_bus_find_by_name("vdev");
> >
> > @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void *arg)
> > if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> > VDEV_NETVSC_DRIVER_NAME_LEN))
> > return;
> > - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> > - vdev_netvsc_cmp_rte_device,
> > VDEV_NETVSC_DRIVER_NAME);
> > +
> > + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> > + VDEV_NETVSC_DRIVER_NAME);
>
> Since the device must be vdev here,
> It is better to use explicit cast to make the checker happy.
The cast is converting from rte_device to rte_vdev_device which incorrect.
The device returned by vbus->find_device is a rte_device not a rte_vdev_device:
vbus->find_device points to rte_vdev_find_device
struct rte_device *
rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
const void *data)
but definition of rte_vdev_device is:
struct rte_vdev_device {
TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
struct rte_device device; /**< Inherit core device */
};
The only safe way to get rte_vdev_device would be to use container_of().
dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
VDEV_NETVSC_DRIVER_NAME);
vdev = dev ? container_of(dev, struct rte_vdev_device, device) : NULL;
But as the PATCH demonstrated, this is not necessary.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-14 15:44 ` Stephen Hemminger
@ 2019-03-14 15:44 ` Stephen Hemminger
2019-03-17 6:16 ` Matan Azrad
1 sibling, 0 replies; 9+ messages in thread
From: Stephen Hemminger @ 2019-03-14 15:44 UTC (permalink / raw)
To: Matan Azrad; +Cc: dev
On Thu, 14 Mar 2019 11:13:10 +0000
Matan Azrad <matan@mellanox.com> wrote:
> Hi
>
> From: Stephen Hemminger
> > The return value from bus->find_device is a rte_device which is not safe to
> > cast to a rte_vdev_device structure.
> > It doesn't really matter since only being checked for NULL but static checkers
> > might find a bug here.
> >
>
> Fix line is missing.
>
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> > drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> > 1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > index ba63fac2a598..801f54c96e01 100644
> > --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> > rte_device *dev1, static void vdev_netvsc_scan_callback(__rte_unused
> > void *arg) {
> > - struct rte_vdev_device *dev;
> > + struct rte_device *dev;
> > struct rte_devargs *devargs;
> > struct rte_bus *vbus = rte_bus_find_by_name("vdev");
> >
> > @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void *arg)
> > if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> > VDEV_NETVSC_DRIVER_NAME_LEN))
> > return;
> > - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> > - vdev_netvsc_cmp_rte_device,
> > VDEV_NETVSC_DRIVER_NAME);
> > +
> > + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> > + VDEV_NETVSC_DRIVER_NAME);
>
> Since the device must be vdev here,
> It is better to use explicit cast to make the checker happy.
The cast is converting from rte_device to rte_vdev_device which incorrect.
The device returned by vbus->find_device is a rte_device not a rte_vdev_device:
vbus->find_device points to rte_vdev_find_device
struct rte_device *
rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
const void *data)
but definition of rte_vdev_device is:
struct rte_vdev_device {
TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
struct rte_device device; /**< Inherit core device */
};
The only safe way to get rte_vdev_device would be to use container_of().
dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
VDEV_NETVSC_DRIVER_NAME);
vdev = dev ? container_of(dev, struct rte_vdev_device, device) : NULL;
But as the PATCH demonstrated, this is not necessary.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-14 15:44 ` Stephen Hemminger
2019-03-14 15:44 ` Stephen Hemminger
@ 2019-03-17 6:16 ` Matan Azrad
2019-03-17 6:16 ` Matan Azrad
2019-03-25 13:51 ` Ferruh Yigit
1 sibling, 2 replies; 9+ messages in thread
From: Matan Azrad @ 2019-03-17 6:16 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: dev
Hi
From: Stephen Hemminger
> > Hi
> >
> > From: Stephen Hemminger
> > > The return value from bus->find_device is a rte_device which is not
> > > safe to cast to a rte_vdev_device structure.
> > > It doesn't really matter since only being checked for NULL but
> > > static checkers might find a bug here.
> > >
> >
> > Fix line is missing.
> >
> > > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > > ---
> > > drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> > > 1 file changed, 4 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > index ba63fac2a598..801f54c96e01 100644
> > > --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> > > rte_device *dev1, static void
> > > vdev_netvsc_scan_callback(__rte_unused
> > > void *arg) {
> > > - struct rte_vdev_device *dev;
> > > + struct rte_device *dev;
> > > struct rte_devargs *devargs;
> > > struct rte_bus *vbus = rte_bus_find_by_name("vdev");
> > >
> > > @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void
> *arg)
> > > if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> > > VDEV_NETVSC_DRIVER_NAME_LEN))
> > > return;
> > > - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> > > - vdev_netvsc_cmp_rte_device,
> > > VDEV_NETVSC_DRIVER_NAME);
> > > +
> > > + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> > > + VDEV_NETVSC_DRIVER_NAME);
> >
> > Since the device must be vdev here,
> > It is better to use explicit cast to make the checker happy.
>
> The cast is converting from rte_device to rte_vdev_device which incorrect.
>
> The device returned by vbus->find_device is a rte_device not a
> rte_vdev_device:
>
> vbus->find_device points to rte_vdev_find_device
>
> struct rte_device *
> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
> const void *data)
>
> but definition of rte_vdev_device is:
>
> struct rte_vdev_device {
> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
> struct rte_device device; /**< Inherit core device */
> };
>
> The only safe way to get rte_vdev_device would be to use container_of().
>
> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> VDEV_NETVSC_DRIVER_NAME);
> vdev = dev ? container_of(dev, struct rte_vdev_device, device) :
> NULL;
>
> But as the PATCH demonstrated, this is not necessary.
Yes, you right.
Please add fix line to the patch + stable line.
Matan
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-17 6:16 ` Matan Azrad
@ 2019-03-17 6:16 ` Matan Azrad
2019-03-25 13:51 ` Ferruh Yigit
1 sibling, 0 replies; 9+ messages in thread
From: Matan Azrad @ 2019-03-17 6:16 UTC (permalink / raw)
To: Stephen Hemminger; +Cc: dev
Hi
From: Stephen Hemminger
> > Hi
> >
> > From: Stephen Hemminger
> > > The return value from bus->find_device is a rte_device which is not
> > > safe to cast to a rte_vdev_device structure.
> > > It doesn't really matter since only being checked for NULL but
> > > static checkers might find a bug here.
> > >
> >
> > Fix line is missing.
> >
> > > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > > ---
> > > drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
> > > 1 file changed, 4 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > index ba63fac2a598..801f54c96e01 100644
> > > --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
> > > @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
> > > rte_device *dev1, static void
> > > vdev_netvsc_scan_callback(__rte_unused
> > > void *arg) {
> > > - struct rte_vdev_device *dev;
> > > + struct rte_device *dev;
> > > struct rte_devargs *devargs;
> > > struct rte_bus *vbus = rte_bus_find_by_name("vdev");
> > >
> > > @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void
> *arg)
> > > if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
> > > VDEV_NETVSC_DRIVER_NAME_LEN))
> > > return;
> > > - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
> > > - vdev_netvsc_cmp_rte_device,
> > > VDEV_NETVSC_DRIVER_NAME);
> > > +
> > > + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> > > + VDEV_NETVSC_DRIVER_NAME);
> >
> > Since the device must be vdev here,
> > It is better to use explicit cast to make the checker happy.
>
> The cast is converting from rte_device to rte_vdev_device which incorrect.
>
> The device returned by vbus->find_device is a rte_device not a
> rte_vdev_device:
>
> vbus->find_device points to rte_vdev_find_device
>
> struct rte_device *
> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
> const void *data)
>
> but definition of rte_vdev_device is:
>
> struct rte_vdev_device {
> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
> struct rte_device device; /**< Inherit core device */
> };
>
> The only safe way to get rte_vdev_device would be to use container_of().
>
> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
> VDEV_NETVSC_DRIVER_NAME);
> vdev = dev ? container_of(dev, struct rte_vdev_device, device) :
> NULL;
>
> But as the PATCH demonstrated, this is not necessary.
Yes, you right.
Please add fix line to the patch + stable line.
Matan
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-17 6:16 ` Matan Azrad
2019-03-17 6:16 ` Matan Azrad
@ 2019-03-25 13:51 ` Ferruh Yigit
2019-03-25 13:51 ` Ferruh Yigit
1 sibling, 1 reply; 9+ messages in thread
From: Ferruh Yigit @ 2019-03-25 13:51 UTC (permalink / raw)
To: Matan Azrad, Stephen Hemminger; +Cc: dev
On 3/17/2019 6:16 AM, Matan Azrad wrote:
> Hi
>
> From: Stephen Hemminger
>>> Hi
>>>
>>> From: Stephen Hemminger
>>>> The return value from bus->find_device is a rte_device which is not
>>>> safe to cast to a rte_vdev_device structure.
>>>> It doesn't really matter since only being checked for NULL but
>>>> static checkers might find a bug here.
>>>>
>>>
>>> Fix line is missing.
>>>
>>>> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
>>>> ---
>>>> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
>>>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> b/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> index ba63fac2a598..801f54c96e01 100644
>>>> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
>>>> rte_device *dev1, static void
>>>> vdev_netvsc_scan_callback(__rte_unused
>>>> void *arg) {
>>>> - struct rte_vdev_device *dev;
>>>> + struct rte_device *dev;
>>>> struct rte_devargs *devargs;
>>>> struct rte_bus *vbus = rte_bus_find_by_name("vdev");
>>>>
>>>> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void
>> *arg)
>>>> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
>>>> VDEV_NETVSC_DRIVER_NAME_LEN))
>>>> return;
>>>> - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
>>>> - vdev_netvsc_cmp_rte_device,
>>>> VDEV_NETVSC_DRIVER_NAME);
>>>> +
>>>> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
>>>> + VDEV_NETVSC_DRIVER_NAME);
>>>
>>> Since the device must be vdev here,
>>> It is better to use explicit cast to make the checker happy.
>>
>> The cast is converting from rte_device to rte_vdev_device which incorrect.
>>
>> The device returned by vbus->find_device is a rte_device not a
>> rte_vdev_device:
>>
>> vbus->find_device points to rte_vdev_find_device
>>
>> struct rte_device *
>> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
>> const void *data)
>>
>> but definition of rte_vdev_device is:
>>
>> struct rte_vdev_device {
>> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
>> struct rte_device device; /**< Inherit core device */
>> };
>>
>> The only safe way to get rte_vdev_device would be to use container_of().
>>
>> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
>> VDEV_NETVSC_DRIVER_NAME);
>> vdev = dev ? container_of(dev, struct rte_vdev_device, device) :
>> NULL;
>>
>> But as the PATCH demonstrated, this is not necessary.
>
> Yes, you right.
> Please add fix line to the patch + stable line.
Adding explicit cast from Matan:
Acked-by: Matan Azrad <matan@mellanox.com>
Fixes: 56252de779a6 ("net/vdev_netvsc: add automatic probing")
Cc: stable@dpdk.org
Applied to dpdk-next-net/master, thanks.
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast
2019-03-25 13:51 ` Ferruh Yigit
@ 2019-03-25 13:51 ` Ferruh Yigit
0 siblings, 0 replies; 9+ messages in thread
From: Ferruh Yigit @ 2019-03-25 13:51 UTC (permalink / raw)
To: Matan Azrad, Stephen Hemminger; +Cc: dev
On 3/17/2019 6:16 AM, Matan Azrad wrote:
> Hi
>
> From: Stephen Hemminger
>>> Hi
>>>
>>> From: Stephen Hemminger
>>>> The return value from bus->find_device is a rte_device which is not
>>>> safe to cast to a rte_vdev_device structure.
>>>> It doesn't really matter since only being checked for NULL but
>>>> static checkers might find a bug here.
>>>>
>>>
>>> Fix line is missing.
>>>
>>>> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
>>>> ---
>>>> drivers/net/vdev_netvsc/vdev_netvsc.c | 7 ++++---
>>>> 1 file changed, 4 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> b/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> index ba63fac2a598..801f54c96e01 100644
>>>> --- a/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> +++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
>>>> @@ -808,7 +808,7 @@ vdev_netvsc_cmp_rte_device(const struct
>>>> rte_device *dev1, static void
>>>> vdev_netvsc_scan_callback(__rte_unused
>>>> void *arg) {
>>>> - struct rte_vdev_device *dev;
>>>> + struct rte_device *dev;
>>>> struct rte_devargs *devargs;
>>>> struct rte_bus *vbus = rte_bus_find_by_name("vdev");
>>>>
>>>> @@ -816,8 +816,9 @@ vdev_netvsc_scan_callback(__rte_unused void
>> *arg)
>>>> if (!strncmp(devargs->name, VDEV_NETVSC_DRIVER_NAME,
>>>> VDEV_NETVSC_DRIVER_NAME_LEN))
>>>> return;
>>>> - dev = (struct rte_vdev_device *)vbus->find_device(NULL,
>>>> - vdev_netvsc_cmp_rte_device,
>>>> VDEV_NETVSC_DRIVER_NAME);
>>>> +
>>>> + dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
>>>> + VDEV_NETVSC_DRIVER_NAME);
>>>
>>> Since the device must be vdev here,
>>> It is better to use explicit cast to make the checker happy.
>>
>> The cast is converting from rte_device to rte_vdev_device which incorrect.
>>
>> The device returned by vbus->find_device is a rte_device not a
>> rte_vdev_device:
>>
>> vbus->find_device points to rte_vdev_find_device
>>
>> struct rte_device *
>> rte_vdev_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
>> const void *data)
>>
>> but definition of rte_vdev_device is:
>>
>> struct rte_vdev_device {
>> TAILQ_ENTRY(rte_vdev_device) next; /**< Next attached vdev */
>> struct rte_device device; /**< Inherit core device */
>> };
>>
>> The only safe way to get rte_vdev_device would be to use container_of().
>>
>> dev = vbus->find_device(NULL, vdev_netvsc_cmp_rte_device,
>> VDEV_NETVSC_DRIVER_NAME);
>> vdev = dev ? container_of(dev, struct rte_vdev_device, device) :
>> NULL;
>>
>> But as the PATCH demonstrated, this is not necessary.
>
> Yes, you right.
> Please add fix line to the patch + stable line.
Adding explicit cast from Matan:
Acked-by: Matan Azrad <matan@mellanox.com>
Fixes: 56252de779a6 ("net/vdev_netvsc: add automatic probing")
Cc: stable@dpdk.org
Applied to dpdk-next-net/master, thanks.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2019-03-25 13:51 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-03-13 2:12 [dpdk-dev] [PATCH] net/vdev_netvsc: fix erronous cast Stephen Hemminger
2019-03-14 11:13 ` Matan Azrad
2019-03-14 11:13 ` Matan Azrad
2019-03-14 15:44 ` Stephen Hemminger
2019-03-14 15:44 ` Stephen Hemminger
2019-03-17 6:16 ` Matan Azrad
2019-03-17 6:16 ` Matan Azrad
2019-03-25 13:51 ` Ferruh Yigit
2019-03-25 13:51 ` Ferruh Yigit
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