error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[john miller]

We are seeing an issue when running from the head of the master branch in dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run testpmd using  -d to point to our PMD we get this error

EAL: Error - exiting with code: 1
  Cause: Creation of mbuf pool for socket 0 failed: Invalid argument

This error occurs as a result of the rte mempool ops table having 0 entries.  This table is populated from a call to rte_mempool_register_ops().  This function gets called in rte_mempool_ring.c via the static initialization MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However this library is not loaded when the rte_eal_init() gets called so the static initializers are not yet loaded.   

I am requesting advice on the proper way to repair this.

Thank you,
-John

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Thomas Monjalon]

2017-04-11 14:02, john miller:
> 
> We are seeing an issue when running from the head of the master branch in dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run testpmd using  -d to point to our PMD we get this error
> 
> EAL: Error - exiting with code: 1
>   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> 
> This error occurs as a result of the rte mempool ops table having 0 entries.  This table is populated from a call to rte_mempool_register_ops().  This function gets called in rte_mempool_ring.c via the static initialization MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However this library is not loaded when the rte_eal_init() gets called so the static initializers are not yet loaded.   
> 
> I am requesting advice on the proper way to repair this.

We should just add a better error message if no mempool driver is available.

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Shreyansh Jain]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Wednesday, April 12, 2017 12:58 AM
> To: john miller <john.miller@atomicrules.com>
> Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> <shreyansh.jain@nxp.com>
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> 2017-04-11 14:02, john miller:
> >
> > We are seeing an issue when running from the head of the master branch in
> dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run
> testpmd using  -d to point to our PMD we get this error
> >
> > EAL: Error - exiting with code: 1
> >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> >
> > This error occurs as a result of the rte mempool ops table having 0
> entries.  This table is populated from a call to rte_mempool_register_ops().
> This function gets called in rte_mempool_ring.c via the static initialization
> MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> this library is not loaded when the rte_eal_init() gets called so the static
> initializers are not yet loaded.
> >
> > I am requesting advice on the proper way to repair this.
 
"-d" the ring library (rte_mempool_ring) - just like any other shared lib.

This change was done recently to move ring handler into its separate drivers/mempool/ring directory. That also means it no longer is compiled into the librte_mempool.

> 
> We should just add a better error message if no mempool driver is available.

Yes, that is something to be improved.

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Bruce Richardson]

On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > -----Original Message-----
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > Sent: Wednesday, April 12, 2017 12:58 AM
> > To: john miller <john.miller@atomicrules.com>
> > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > <shreyansh.jain@nxp.com>
> > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > 
> > 2017-04-11 14:02, john miller:
> > >
> > > We are seeing an issue when running from the head of the master branch in
> > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run
> > testpmd using  -d to point to our PMD we get this error
> > >
> > > EAL: Error - exiting with code: 1
> > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > >
> > > This error occurs as a result of the rte mempool ops table having 0
> > entries.  This table is populated from a call to rte_mempool_register_ops().
> > This function gets called in rte_mempool_ring.c via the static initialization
> > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> > this library is not loaded when the rte_eal_init() gets called so the static
> > initializers are not yet loaded.
> > >
> > > I am requesting advice on the proper way to repair this.
>  
> "-d" the ring library (rte_mempool_ring) - just like any other shared lib.
> 

I think this is a bug that should be fixed. The user should not need to
have to specify a mempool driver just to get testpmd working, so I think
the ring handler as default should be compiled in automatically so as to
allow regular mempools to just work as before.

> This change was done recently to move ring handler into its separate drivers/mempool/ring directory. That also means it no longer is compiled into the librte_mempool.
> 
> > 
> > We should just add a better error message if no mempool driver is available.
> 
> Yes, that is something to be improved.

This should be fixed by always having a mempool driver installed.

/Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Thomas Monjalon]

2017-04-12 11:05, Bruce Richardson:
> On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > 2017-04-11 14:02, john miller:
> > > >
> > > > We are seeing an issue when running from the head of the master branch in
> > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run
> > > testpmd using  -d to point to our PMD we get this error
> > > >
> > > > EAL: Error - exiting with code: 1
> > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > >
> > > > This error occurs as a result of the rte mempool ops table having 0
> > > entries.  This table is populated from a call to rte_mempool_register_ops().
> > > This function gets called in rte_mempool_ring.c via the static initialization
> > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> > > this library is not loaded when the rte_eal_init() gets called so the static
> > > initializers are not yet loaded.
> > > >
> > > > I am requesting advice on the proper way to repair this.
> >  
> > "-d" the ring library (rte_mempool_ring) - just like any other shared lib.
> > 
> 
> I think this is a bug that should be fixed. The user should not need to
> have to specify a mempool driver just to get testpmd working, so I think
> the ring handler as default should be compiled in automatically so as to
> allow regular mempools to just work as before.

We thought about it when moving the mempool handler as a driver.
The common case when using shared libs, is to specify the lib directory
with -d or with CONFIG_RTE_EAL_PMD_PATH.

I am not sure we should make an exception for the mempool driver.
If it is built as a shared library, the only one able to link it is
the user (who knows where the file is).


> > This change was done recently to move ring handler into its separate drivers/mempool/ring directory. That also means it no longer is compiled into the librte_mempool.
> > 
> > > 
> > > We should just add a better error message if no mempool driver is available.
> > 
> > Yes, that is something to be improved.
> 
> This should be fixed by always having a mempool driver installed.

It is not a matter of having it installed but finding it in the right path.
A good error message suggesting -d would be OK I think.

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Neil Horman]

On Wed, Apr 12, 2017 at 12:25:34PM +0200, Thomas Monjalon wrote:
> 2017-04-12 11:05, Bruce Richardson:
> > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > 2017-04-11 14:02, john miller:
> > > > >
> > > > > We are seeing an issue when running from the head of the master branch in
> > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we run
> > > > testpmd using  -d to point to our PMD we get this error
> > > > >
> > > > > EAL: Error - exiting with code: 1
> > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > >
> > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > entries.  This table is populated from a call to rte_mempool_register_ops().
> > > > This function gets called in rte_mempool_ring.c via the static initialization
> > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> > > > this library is not loaded when the rte_eal_init() gets called so the static
> > > > initializers are not yet loaded.
> > > > >
> > > > > I am requesting advice on the proper way to repair this.
> > >  
> > > "-d" the ring library (rte_mempool_ring) - just like any other shared lib.
> > > 
> > 
> > I think this is a bug that should be fixed. The user should not need to
> > have to specify a mempool driver just to get testpmd working, so I think
> > the ring handler as default should be compiled in automatically so as to
> > allow regular mempools to just work as before.
> 
> We thought about it when moving the mempool handler as a driver.
> The common case when using shared libs, is to specify the lib directory
> with -d or with CONFIG_RTE_EAL_PMD_PATH.
> 
> I am not sure we should make an exception for the mempool driver.
> If it is built as a shared library, the only one able to link it is
> the user (who knows where the file is).
> 
> 
> > > This change was done recently to move ring handler into its separate drivers/mempool/ring directory. That also means it no longer is compiled into the librte_mempool.
> > > 
> > > > 
> > > > We should just add a better error message if no mempool driver is available.
> > > 
> > > Yes, that is something to be improved.
> > 
> > This should be fixed by always having a mempool driver installed.
> 
> It is not a matter of having it installed but finding it in the right path.
> A good error message suggesting -d would be OK I think.

Well, ostensibly, the "right path" will either be set by the system, or can be
embedded in the application.  it seems like it would be reasonable during
initalization to dlopen a default mempool driver, should another driver not be
manually loaded, the location for which can either be expressly encoded using
the rpath linker option, or assumed to be installed in the default location set
described by LD_LIBRARY_PATH or the system default paths

Neil

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Shreyansh Jain]

> -----Original Message-----
> From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> Sent: Wednesday, April 12, 2017 3:35 PM
> To: Shreyansh Jain <shreyansh.jain@nxp.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > -----Original Message-----
> > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > To: john miller <john.miller@atomicrules.com>
> > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > <shreyansh.jain@nxp.com>
> > > Subject: Re: [dpdk-dev] error in testpmd when
> CONFIG_RTE_BUILD_SHARED_LIB=y
> > >
> > > 2017-04-11 14:02, john miller:
> > > >
> > > > We are seeing an issue when running from the head of the master branch
> in
> > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we
> run
> > > testpmd using  -d to point to our PMD we get this error
> > > >
> > > > EAL: Error - exiting with code: 1
> > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > >
> > > > This error occurs as a result of the rte mempool ops table having 0
> > > entries.  This table is populated from a call to
> rte_mempool_register_ops().
> > > This function gets called in rte_mempool_ring.c via the static
> initialization
> > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> > > this library is not loaded when the rte_eal_init() gets called so the
> static
> > > initializers are not yet loaded.
> > > >
> > > > I am requesting advice on the proper way to repair this.
> >
> > "-d" the ring library (rte_mempool_ring) - just like any other shared lib.
> >
> 
> I think this is a bug that should be fixed. The user should not need to
> have to specify a mempool driver just to get testpmd working, so I think
> the ring handler as default should be compiled in automatically so as to
> allow regular mempools to just work as before.
 
For Ring Mempool as default enabled, +1

> 
> > This change was done recently to move ring handler into its separate
> drivers/mempool/ring directory. That also means it no longer is compiled into
> the librte_mempool.
> >
> > >
> > > We should just add a better error message if no mempool driver is
> available.
> >
> > Yes, that is something to be improved.
> 
> This should be fixed by always having a mempool driver installed.
 
Agree.
Otherwise also, the framework seems to be replying with a valid code 'EINVAL' for an invalid mempool specified.

> 
> /Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Ananyev, Konstantin]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Shreyansh Jain
> Sent: Wednesday, April 12, 2017 11:26 AM
> To: Richardson, Bruce <bruce.richardson@intel.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller <john.miller@atomicrules.com>; dev@dpdk.org;
> olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> > -----Original Message-----
> > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Sent: Wednesday, April 12, 2017 3:35 PM
> > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> >
> > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > -----Original Message-----
> > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > To: john miller <john.miller@atomicrules.com>
> > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > <shreyansh.jain@nxp.com>
> > > > Subject: Re: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > 2017-04-11 14:02, john miller:
> > > > >
> > > > > We are seeing an issue when running from the head of the master branch
> > in
> > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When we
> > run
> > > > testpmd using  -d to point to our PMD we get this error
> > > > >
> > > > > EAL: Error - exiting with code: 1
> > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > >
> > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > entries.  This table is populated from a call to
> > rte_mempool_register_ops().
> > > > This function gets called in rte_mempool_ring.c via the static
> > initialization
> > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.  However
> > > > this library is not loaded when the rte_eal_init() gets called so the
> > static
> > > > initializers are not yet loaded.
> > > > >
> > > > > I am requesting advice on the proper way to repair this.
> > >
> > > "-d" the ring library (rte_mempool_ring) - just like any other shared lib.
> > >
> >
> > I think this is a bug that should be fixed. The user should not need to
> > have to specify a mempool driver just to get testpmd working, so I think
> > the ring handler as default should be compiled in automatically so as to
> > allow regular mempools to just work as before.
> 
> For Ring Mempool as default enabled, +1

Same thought here.
Why just not have a default mempool driver always built in?
Konstantin

> 
> >
> > > This change was done recently to move ring handler into its separate
> > drivers/mempool/ring directory. That also means it no longer is compiled into
> > the librte_mempool.
> > >
> > > >
> > > > We should just add a better error message if no mempool driver is
> > available.
> > >
> > > Yes, that is something to be improved.
> >
> > This should be fixed by always having a mempool driver installed.
> 
> Agree.
> Otherwise also, the framework seems to be replying with a valid code 'EINVAL' for an invalid mempool specified.
> 
> >
> > /Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Shreyansh Jain]

My bad - I was too quick in replying - some clarification beneath.

> -----Original Message-----
> From: Shreyansh Jain
> Sent: Wednesday, April 12, 2017 3:55 PM
> To: 'Bruce Richardson' <bruce.richardson@intel.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> Subject: RE: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> > -----Original Message-----
> > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Sent: Wednesday, April 12, 2017 3:35 PM
> > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> >
> > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > -----Original Message-----
> > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > To: john miller <john.miller@atomicrules.com>
> > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > <shreyansh.jain@nxp.com>
> > > > Subject: Re: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > 2017-04-11 14:02, john miller:
> > > > >
> > > > > We are seeing an issue when running from the head of the master
> branch
> > in
> > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When
> we
> > run
> > > > testpmd using  -d to point to our PMD we get this error
> > > > >
> > > > > EAL: Error - exiting with code: 1
> > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > >
> > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > entries.  This table is populated from a call to
> > rte_mempool_register_ops().
> > > > This function gets called in rte_mempool_ring.c via the static
> > initialization
> > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> However
> > > > this library is not loaded when the rte_eal_init() gets called so the
> > static
> > > > initializers are not yet loaded.
> > > > >
> > > > > I am requesting advice on the proper way to repair this.
> > >
> > > "-d" the ring library (rte_mempool_ring) - just like any other shared
> lib.
> > >
> >
> > I think this is a bug that should be fixed. The user should not need to
> > have to specify a mempool driver just to get testpmd working, so I think
> > the ring handler as default should be compiled in automatically so as to
> > allow regular mempools to just work as before.
> 
> For Ring Mempool as default enabled, +1
 
Actually, Ring mempool is enabled by default. But, obviously for shared library case, this still means "-d".

> 
> >
> > > This change was done recently to move ring handler into its separate
> > drivers/mempool/ring directory. That also means it no longer is compiled
> into
> > the librte_mempool.
> > >
> > > >
> > > > We should just add a better error message if no mempool driver is
> > available.
> > >
> > > Yes, that is something to be improved.
> >
> > This should be fixed by always having a mempool driver installed.
> 
> Agree.
 
Probably, as ring mempool is a driver and compiled in shared mode, enabled by default will not fix this.

> Otherwise also, the framework seems to be replying with a valid code 'EINVAL'
> for an invalid mempool specified.
> 
> >
> > /Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Bruce Richardson]

On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> My bad - I was too quick in replying - some clarification beneath.
> 
> > -----Original Message-----
> > From: Shreyansh Jain
> > Sent: Wednesday, April 12, 2017 3:55 PM
> > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: RE: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > 
> > > -----Original Message-----
> > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > >
> > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > -----Original Message-----
> > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > To: john miller <john.miller@atomicrules.com>
> > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > <shreyansh.jain@nxp.com>
> > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > >
> > > > > 2017-04-11 14:02, john miller:
> > > > > >
> > > > > > We are seeing an issue when running from the head of the master
> > branch
> > > in
> > > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When
> > we
> > > run
> > > > > testpmd using  -d to point to our PMD we get this error
> > > > > >
> > > > > > EAL: Error - exiting with code: 1
> > > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > > >
> > > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > > entries.  This table is populated from a call to
> > > rte_mempool_register_ops().
> > > > > This function gets called in rte_mempool_ring.c via the static
> > > initialization
> > > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> > However
> > > > > this library is not loaded when the rte_eal_init() gets called so the
> > > static
> > > > > initializers are not yet loaded.
> > > > > >
> > > > > > I am requesting advice on the proper way to repair this.
> > > >
> > > > "-d" the ring library (rte_mempool_ring) - just like any other shared
> > lib.
> > > >
> > >
> > > I think this is a bug that should be fixed. The user should not need to
> > > have to specify a mempool driver just to get testpmd working, so I think
> > > the ring handler as default should be compiled in automatically so as to
> > > allow regular mempools to just work as before.
> > 
> > For Ring Mempool as default enabled, +1
>  
> Actually, Ring mempool is enabled by default. But, obviously for shared library case, this still means "-d".
> 

Not necessarily. That only applies if we don't explicitly link it like
the other shared libraries. We "special-case" our drivers in that we
don't add them with a -l flag, but expect the user to dynamically load
them at runtime. This is one case where I think all apps should
explicitly link against the ring mempool driver. There is no reason we
can't make some drivers mandatory.

> > 
> > >
> > > > This change was done recently to move ring handler into its separate
> > > drivers/mempool/ring directory. That also means it no longer is compiled
> > into
> > > the librte_mempool.
> > > >
> > > > >
> > > > > We should just add a better error message if no mempool driver is
> > > available.
> > > >
> > > > Yes, that is something to be improved.
> > >
> > > This should be fixed by always having a mempool driver installed.
> > 
> > Agree.
>  
> Probably, as ring mempool is a driver and compiled in shared mode, enabled by default will not fix this.

But linked in by default will fix it.

/Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Bruce Richardson]

On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > My bad - I was too quick in replying - some clarification beneath.
> > 
> > > -----Original Message-----
> > > From: Shreyansh Jain
> > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > Subject: RE: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > > 
> > > > -----Original Message-----
> > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > -----Original Message-----
> > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > <shreyansh.jain@nxp.com>
> > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > >
> > > > > > 2017-04-11 14:02, john miller:
> > > > > > >
> > > > > > > We are seeing an issue when running from the head of the master
> > > branch
> > > > in
> > > > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When
> > > we
> > > > run
> > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > >
> > > > > > > EAL: Error - exiting with code: 1
> > > > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > > > >
> > > > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > > > entries.  This table is populated from a call to
> > > > rte_mempool_register_ops().
> > > > > > This function gets called in rte_mempool_ring.c via the static
> > > > initialization
> > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> > > However
> > > > > > this library is not loaded when the rte_eal_init() gets called so the
> > > > static
> > > > > > initializers are not yet loaded.
> > > > > > >
> > > > > > > I am requesting advice on the proper way to repair this.
> > > > >
> > > > > "-d" the ring library (rte_mempool_ring) - just like any other shared
> > > lib.
> > > > >
> > > >
> > > > I think this is a bug that should be fixed. The user should not need to
> > > > have to specify a mempool driver just to get testpmd working, so I think
> > > > the ring handler as default should be compiled in automatically so as to
> > > > allow regular mempools to just work as before.
> > > 
> > > For Ring Mempool as default enabled, +1
> >  
> > Actually, Ring mempool is enabled by default. But, obviously for shared library case, this still means "-d".
> > 
> 
> Not necessarily. That only applies if we don't explicitly link it like
> the other shared libraries. We "special-case" our drivers in that we
> don't add them with a -l flag, but expect the user to dynamically load
> them at runtime. This is one case where I think all apps should
> explicitly link against the ring mempool driver. There is no reason we
> can't make some drivers mandatory.
> 
> > > 
> > > >
> > > > > This change was done recently to move ring handler into its separate
> > > > drivers/mempool/ring directory. That also means it no longer is compiled
> > > into
> > > > the librte_mempool.
> > > > >
> > > > > >
> > > > > > We should just add a better error message if no mempool driver is
> > > > available.
> > > > >
> > > > > Yes, that is something to be improved.
> > > >
> > > > This should be fixed by always having a mempool driver installed.
> > > 
> > > Agree.
> >  
> > Probably, as ring mempool is a driver and compiled in shared mode, enabled by default will not fix this.
> 
> But linked in by default will fix it.
> 
And as follow-up to my own mail, I think we can actually go further
here. Mempool is a core library, and very little can be done in DPDK
without it. It's also not what most people would think as needing a
driver loaded, so from a usability point of view, I don't see why we
shouldn't link in all mempool drivers by default, like we do other libs.
It will make users life easier, and I can't see any downside to doing
so - they are just .so's after all!

/Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Van Haaren, Harry]

> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Bruce Richardson
> Sent: Wednesday, April 12, 2017 11:42 AM
> To: Shreyansh Jain <shreyansh.jain@nxp.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller <john.miller@atomicrules.com>;
> dev@dpdk.org; olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > > My bad - I was too quick in replying - some clarification beneath.
> > >
> > > > -----Original Message-----
> > > > From: Shreyansh Jain
> > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > Subject: RE: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > > -----Original Message-----
> > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > >
> > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > > -----Original Message-----
> > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > >
> > > > > > > 2017-04-11 14:02, john miller:
> > > > > > > >
> > > > > > > > We are seeing an issue when running from the head of the master
> > > > branch
> > > > > in
> > > > > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.   When
> > > > we
> > > > > run
> > > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > > >
> > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid argument
> > > > > > > >
> > > > > > > > This error occurs as a result of the rte mempool ops table having 0
> > > > > > > entries.  This table is populated from a call to
> > > > > rte_mempool_register_ops().
> > > > > > > This function gets called in rte_mempool_ring.c via the static
> > > > > initialization
> > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> > > > However
> > > > > > > this library is not loaded when the rte_eal_init() gets called so the
> > > > > static
> > > > > > > initializers are not yet loaded.
> > > > > > > >
> > > > > > > > I am requesting advice on the proper way to repair this.
> > > > > >
> > > > > > "-d" the ring library (rte_mempool_ring) - just like any other shared
> > > > lib.
> > > > > >
> > > > >
> > > > > I think this is a bug that should be fixed. The user should not need to
> > > > > have to specify a mempool driver just to get testpmd working, so I think
> > > > > the ring handler as default should be compiled in automatically so as to
> > > > > allow regular mempools to just work as before.
> > > >
> > > > For Ring Mempool as default enabled, +1
> > >
> > > Actually, Ring mempool is enabled by default. But, obviously for shared library case, this
> still means "-d".
> > >
> >
> > Not necessarily. That only applies if we don't explicitly link it like
> > the other shared libraries. We "special-case" our drivers in that we
> > don't add them with a -l flag, but expect the user to dynamically load
> > them at runtime. This is one case where I think all apps should
> > explicitly link against the ring mempool driver. There is no reason we
> > can't make some drivers mandatory.
> >
> > > >
> > > > >
> > > > > > This change was done recently to move ring handler into its separate
> > > > > drivers/mempool/ring directory. That also means it no longer is compiled
> > > > into
> > > > > the librte_mempool.
> > > > > >
> > > > > > >
> > > > > > > We should just add a better error message if no mempool driver is
> > > > > available.
> > > > > >
> > > > > > Yes, that is something to be improved.
> > > > >
> > > > > This should be fixed by always having a mempool driver installed.
> > > >
> > > > Agree.
> > >
> > > Probably, as ring mempool is a driver and compiled in shared mode, enabled by default will
> not fix this.
> >
> > But linked in by default will fix it.
> >
> And as follow-up to my own mail, I think we can actually go further
> here. Mempool is a core library, and very little can be done in DPDK
> without it. It's also not what most people would think as needing a
> driver loaded, so from a usability point of view, I don't see why we
> shouldn't link in all mempool drivers by default, like we do other libs.
> It will make users life easier, and I can't see any downside to doing
> so - they are just .so's after all!

Another point to keep in mind is backwards compatibility; think about various testing frameworks that currently do not use -d for mempool. They will all break if we require a  -d /path/to/mempool.so  argument.

+1 for linking it automatically

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Shreyansh Jain]

> -----Original Message-----
> From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> Sent: Wednesday, April 12, 2017 4:12 PM
> To: Shreyansh Jain <shreyansh.jain@nxp.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > > My bad - I was too quick in replying - some clarification beneath.
> > >
> > > > -----Original Message-----
> > > > From: Shreyansh Jain
> > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > Subject: RE: [dpdk-dev] error in testpmd when
> CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > > -----Original Message-----
> > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > > Subject: Re: [dpdk-dev] error in testpmd when
> CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > >
> > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > > -----Original Message-----
> > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > >
> > > > > > > 2017-04-11 14:02, john miller:
> > > > > > > >
> > > > > > > > We are seeing an issue when running from the head of the master
> > > > branch
> > > > > in
> > > > > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.
> When
> > > > we
> > > > > run
> > > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > > >
> > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid
> argument
> > > > > > > >
> > > > > > > > This error occurs as a result of the rte mempool ops table
> having 0
> > > > > > > entries.  This table is populated from a call to
> > > > > rte_mempool_register_ops().
> > > > > > > This function gets called in rte_mempool_ring.c via the static
> > > > > initialization
> > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> > > > However
> > > > > > > this library is not loaded when the rte_eal_init() gets called so
> the
> > > > > static
> > > > > > > initializers are not yet loaded.
> > > > > > > >
> > > > > > > > I am requesting advice on the proper way to repair this.
> > > > > >
> > > > > > "-d" the ring library (rte_mempool_ring) - just like any other
> shared
> > > > lib.
> > > > > >
> > > > >
> > > > > I think this is a bug that should be fixed. The user should not need
> to
> > > > > have to specify a mempool driver just to get testpmd working, so I
> think
> > > > > the ring handler as default should be compiled in automatically so as
> to
> > > > > allow regular mempools to just work as before.
> > > >
> > > > For Ring Mempool as default enabled, +1
> > >
> > > Actually, Ring mempool is enabled by default. But, obviously for shared
> library case, this still means "-d".
> > >
> >
> > Not necessarily. That only applies if we don't explicitly link it like
> > the other shared libraries. We "special-case" our drivers in that we
> > don't add them with a -l flag, but expect the user to dynamically load
> > them at runtime. This is one case where I think all apps should
> > explicitly link against the ring mempool driver. There is no reason we
> > can't make some drivers mandatory.
> >
> > > >
> > > > >
> > > > > > This change was done recently to move ring handler into its
> separate
> > > > > drivers/mempool/ring directory. That also means it no longer is
> compiled
> > > > into
> > > > > the librte_mempool.
> > > > > >
> > > > > > >
> > > > > > > We should just add a better error message if no mempool driver is
> > > > > available.
> > > > > >
> > > > > > Yes, that is something to be improved.
> > > > >
> > > > > This should be fixed by always having a mempool driver installed.
> > > >
> > > > Agree.
> > >
> > > Probably, as ring mempool is a driver and compiled in shared mode,
> enabled by default will not fix this.
> >
> > But linked in by default will fix it.
> >
> And as follow-up to my own mail, I think we can actually go further
> here. Mempool is a core library, and very little can be done in DPDK
> without it. It's also not what most people would think as needing a
> driver loaded, so from a usability point of view, I don't see why we
> shouldn't link in all mempool drivers by default, like we do other libs.
> It will make users life easier, and I can't see any downside to doing
> so - they are just .so's after all!
 
I don't have a particularly strong opinion against this.
For static build, we are already 'there' - mempool would be linked in with testpmd.
For Shared library, the idea is to have small footprint and leave it to user to link what is required, and what is not.

Still, for usability sakes, we have three options:
1. Link all library - which might be more than just ring (stack, more to be added soon...)
2. Only link ring by default - because that is also being used as default option when creating the mempool (ring_mp_mc)
3. Don't link any

(3) is a cleaner approach, but may not be a good usecase. But, going by (1) would mean linking in unused mempool handler by default (yes, user could always say 'n' in config file).

So, if we are going to select the mempool as inbuild, we might as well have it only for Ring (2).

It's more important to make DPDK useful than to make it idealistic. :)

> 
> /Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Richardson, Bruce]

> -----Original Message-----
> From: Shreyansh Jain [mailto:shreyansh.jain@nxp.com]
> Sent: Wednesday, April 12, 2017 12:02 PM
> To: Richardson, Bruce <bruce.richardson@intel.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> Subject: RE: [dpdk-dev] error in testpmd when
> CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> > -----Original Message-----
> > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Sent: Wednesday, April 12, 2017 4:12 PM
> > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: Re: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> >
> > On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> > > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > > > My bad - I was too quick in replying - some clarification beneath.
> > > >
> > > > > -----Original Message-----
> > > > > From: Shreyansh Jain
> > > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > olivier.matz@6wind.com
> > > > > Subject: RE: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > > olivier.matz@6wind.com
> > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > >
> > > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > > > -----Original Message-----
> > > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > > >
> > > > > > > > 2017-04-11 14:02, john miller:
> > > > > > > > >
> > > > > > > > > We are seeing an issue when running from the head of the
> > > > > > > > > master
> > > > > branch
> > > > > > in
> > > > > > > > dpdk-next-net and building with
> CONFIG_RTE_BUILD_SHARED_LIB=y.
> > When
> > > > > we
> > > > > > run
> > > > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > > > >
> > > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed:
> > > > > > > > > Invalid
> > argument
> > > > > > > > >
> > > > > > > > > This error occurs as a result of the rte mempool ops
> > > > > > > > > table
> > having 0
> > > > > > > > entries.  This table is populated from a call to
> > > > > > rte_mempool_register_ops().
> > > > > > > > This function gets called in rte_mempool_ring.c via the
> > > > > > > > static
> > > > > > initialization
> > > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in
> librte_mempool_ring.so.
> > > > > However
> > > > > > > > this library is not loaded when the rte_eal_init() gets
> > > > > > > > called so
> > the
> > > > > > static
> > > > > > > > initializers are not yet loaded.
> > > > > > > > >
> > > > > > > > > I am requesting advice on the proper way to repair this.
> > > > > > >
> > > > > > > "-d" the ring library (rte_mempool_ring) - just like any
> > > > > > > other
> > shared
> > > > > lib.
> > > > > > >
> > > > > >
> > > > > > I think this is a bug that should be fixed. The user should
> > > > > > not need
> > to
> > > > > > have to specify a mempool driver just to get testpmd working,
> > > > > > so I
> > think
> > > > > > the ring handler as default should be compiled in
> > > > > > automatically so as
> > to
> > > > > > allow regular mempools to just work as before.
> > > > >
> > > > > For Ring Mempool as default enabled, +1
> > > >
> > > > Actually, Ring mempool is enabled by default. But, obviously for
> > > > shared
> > library case, this still means "-d".
> > > >
> > >
> > > Not necessarily. That only applies if we don't explicitly link it
> > > like the other shared libraries. We "special-case" our drivers in
> > > that we don't add them with a -l flag, but expect the user to
> > > dynamically load them at runtime. This is one case where I think all
> > > apps should explicitly link against the ring mempool driver. There
> > > is no reason we can't make some drivers mandatory.
> > >
> > > > >
> > > > > >
> > > > > > > This change was done recently to move ring handler into its
> > separate
> > > > > > drivers/mempool/ring directory. That also means it no longer
> > > > > > is
> > compiled
> > > > > into
> > > > > > the librte_mempool.
> > > > > > >
> > > > > > > >
> > > > > > > > We should just add a better error message if no mempool
> > > > > > > > driver is
> > > > > > available.
> > > > > > >
> > > > > > > Yes, that is something to be improved.
> > > > > >
> > > > > > This should be fixed by always having a mempool driver
> installed.
> > > > >
> > > > > Agree.
> > > >
> > > > Probably, as ring mempool is a driver and compiled in shared mode,
> > enabled by default will not fix this.
> > >
> > > But linked in by default will fix it.
> > >
> > And as follow-up to my own mail, I think we can actually go further
> > here. Mempool is a core library, and very little can be done in DPDK
> > without it. It's also not what most people would think as needing a
> > driver loaded, so from a usability point of view, I don't see why we
> > shouldn't link in all mempool drivers by default, like we do other libs.
> > It will make users life easier, and I can't see any downside to doing
> > so - they are just .so's after all!
> 
> I don't have a particularly strong opinion against this.
> For static build, we are already 'there' - mempool would be linked in with
> testpmd.
> For Shared library, the idea is to have small footprint and leave it to
> user to link what is required, and what is not.
> 
> Still, for usability sakes, we have three options:
> 1. Link all library - which might be more than just ring (stack, more to
> be added soon...) 2. Only link ring by default - because that is also
> being used as default option when creating the mempool (ring_mp_mc) 3.
> Don't link any
> 
> (3) is a cleaner approach, but may not be a good usecase. But, going by
> (1) would mean linking in unused mempool handler by default (yes, user
> could always say 'n' in config file).
> 
> So, if we are going to select the mempool as inbuild, we might as well
> have it only for Ring (2).
> 
> It's more important to make DPDK useful than to make it idealistic. :)
> 

I'm ok with option 2 or 3.

/Bruce

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Thomas Monjalon]

2017-04-12 11:31, Richardson, Bruce:
> 
> > -----Original Message-----
> > From: Shreyansh Jain [mailto:shreyansh.jain@nxp.com]
> > Sent: Wednesday, April 12, 2017 12:02 PM
> > To: Richardson, Bruce <bruce.richardson@intel.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: RE: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > 
> > > -----Original Message-----
> > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > Sent: Wednesday, April 12, 2017 4:12 PM
> > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > Subject: Re: [dpdk-dev] error in testpmd when
> > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > >
> > > On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> > > > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > > > > My bad - I was too quick in replying - some clarification beneath.
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Shreyansh Jain
> > > > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > > olivier.matz@6wind.com
> > > > > > Subject: RE: [dpdk-dev] error in testpmd when
> > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > > > olivier.matz@6wind.com
> > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > >
> > > > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > > > > -----Original Message-----
> > > > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > > > >
> > > > > > > > > 2017-04-11 14:02, john miller:
> > > > > > > > > >
> > > > > > > > > > We are seeing an issue when running from the head of the
> > > > > > > > > > master
> > > > > > branch
> > > > > > > in
> > > > > > > > > dpdk-next-net and building with
> > CONFIG_RTE_BUILD_SHARED_LIB=y.
> > > When
> > > > > > we
> > > > > > > run
> > > > > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > > > > >
> > > > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed:
> > > > > > > > > > Invalid
> > > argument
> > > > > > > > > >
> > > > > > > > > > This error occurs as a result of the rte mempool ops
> > > > > > > > > > table
> > > having 0
> > > > > > > > > entries.  This table is populated from a call to
> > > > > > > rte_mempool_register_ops().
> > > > > > > > > This function gets called in rte_mempool_ring.c via the
> > > > > > > > > static
> > > > > > > initialization
> > > > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in
> > librte_mempool_ring.so.
> > > > > > However
> > > > > > > > > this library is not loaded when the rte_eal_init() gets
> > > > > > > > > called so
> > > the
> > > > > > > static
> > > > > > > > > initializers are not yet loaded.
> > > > > > > > > >
> > > > > > > > > > I am requesting advice on the proper way to repair this.
> > > > > > > >
> > > > > > > > "-d" the ring library (rte_mempool_ring) - just like any
> > > > > > > > other
> > > shared
> > > > > > lib.
> > > > > > > >
> > > > > > >
> > > > > > > I think this is a bug that should be fixed. The user should
> > > > > > > not need
> > > to
> > > > > > > have to specify a mempool driver just to get testpmd working,
> > > > > > > so I
> > > think
> > > > > > > the ring handler as default should be compiled in
> > > > > > > automatically so as
> > > to
> > > > > > > allow regular mempools to just work as before.
> > > > > >
> > > > > > For Ring Mempool as default enabled, +1
> > > > >
> > > > > Actually, Ring mempool is enabled by default. But, obviously for
> > > > > shared
> > > library case, this still means "-d".
> > > > >
> > > >
> > > > Not necessarily. That only applies if we don't explicitly link it
> > > > like the other shared libraries. We "special-case" our drivers in
> > > > that we don't add them with a -l flag, but expect the user to
> > > > dynamically load them at runtime. This is one case where I think all
> > > > apps should explicitly link against the ring mempool driver. There
> > > > is no reason we can't make some drivers mandatory.
> > > >
> > > > > >
> > > > > > >
> > > > > > > > This change was done recently to move ring handler into its
> > > separate
> > > > > > > drivers/mempool/ring directory. That also means it no longer
> > > > > > > is
> > > compiled
> > > > > > into
> > > > > > > the librte_mempool.
> > > > > > > >
> > > > > > > > >
> > > > > > > > > We should just add a better error message if no mempool
> > > > > > > > > driver is
> > > > > > > available.
> > > > > > > >
> > > > > > > > Yes, that is something to be improved.
> > > > > > >
> > > > > > > This should be fixed by always having a mempool driver
> > installed.
> > > > > >
> > > > > > Agree.
> > > > >
> > > > > Probably, as ring mempool is a driver and compiled in shared mode,
> > > enabled by default will not fix this.
> > > >
> > > > But linked in by default will fix it.
> > > >
> > > And as follow-up to my own mail, I think we can actually go further
> > > here. Mempool is a core library, and very little can be done in DPDK
> > > without it. It's also not what most people would think as needing a
> > > driver loaded, so from a usability point of view, I don't see why we
> > > shouldn't link in all mempool drivers by default, like we do other libs.
> > > It will make users life easier, and I can't see any downside to doing
> > > so - they are just .so's after all!
> > 
> > I don't have a particularly strong opinion against this.
> > For static build, we are already 'there' - mempool would be linked in with
> > testpmd.
> > For Shared library, the idea is to have small footprint and leave it to
> > user to link what is required, and what is not.
> > 
> > Still, for usability sakes, we have three options:
> > 1. Link all library - which might be more than just ring (stack, more to
> > be added soon...) 2. Only link ring by default - because that is also
> > being used as default option when creating the mempool (ring_mp_mc) 3.
> > Don't link any
> > 
> > (3) is a cleaner approach, but may not be a good usecase. But, going by
> > (1) would mean linking in unused mempool handler by default (yes, user
> > could always say 'n' in config file).
> > 
> > So, if we are going to select the mempool as inbuild, we might as well
> > have it only for Ring (2).
> > 
> > It's more important to make DPDK useful than to make it idealistic. :)
> > 
> 
> I'm ok with option 2 or 3.

I think the default mempool could be linked.
I don't know how easy it is to transform
	CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS="ring_mp_mc"
into
	-lrte_mempool_ring

Anyone for a patch?

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Olivier MATZ]

Hi,

On Wed, 12 Apr 2017 14:31:56 +0200
Thomas Monjalon <thomas.monjalon@6wind.com> wrote:

> 2017-04-12 11:31, Richardson, Bruce:
> >   
> > > -----Original Message-----
> > > From: Shreyansh Jain [mailto:shreyansh.jain@nxp.com]
> > > Sent: Wednesday, April 12, 2017 12:02 PM
> > > To: Richardson, Bruce <bruce.richardson@intel.com>
> > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > Subject: RE: [dpdk-dev] error in testpmd when
> > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > >   
> > > > -----Original Message-----
> > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > Sent: Wednesday, April 12, 2017 4:12 PM
> > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > >
> > > > On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:  
> > > > > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:  
> > > > > > My bad - I was too quick in replying - some clarification beneath.
> > > > > >  
> > > > > > > -----Original Message-----
> > > > > > > From: Shreyansh Jain
> > > > > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > > > olivier.matz@6wind.com
> > > > > > > Subject: RE: [dpdk-dev] error in testpmd when  
> > > > CONFIG_RTE_BUILD_SHARED_LIB=y  
> > > > > > >  
> > > > > > > > -----Original Message-----
> > > > > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > > > <john.miller@atomicrules.com>; dev@dpdk.org;
> > > > > > > > olivier.matz@6wind.com
> > > > > > > > Subject: Re: [dpdk-dev] error in testpmd when  
> > > > CONFIG_RTE_BUILD_SHARED_LIB=y  
> > > > > > > >
> > > > > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:  
> > > > > > > > > > -----Original Message-----
> > > > > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > > > > Subject: Re: [dpdk-dev] error in testpmd when  
> > > > > > > > CONFIG_RTE_BUILD_SHARED_LIB=y  
> > > > > > > > > >
> > > > > > > > > > 2017-04-11 14:02, john miller:  
> > > > > > > > > > >
> > > > > > > > > > > We are seeing an issue when running from the head of the
> > > > > > > > > > > master  
> > > > > > > branch  
> > > > > > > > in  
> > > > > > > > > > dpdk-next-net and building with  
> > > CONFIG_RTE_BUILD_SHARED_LIB=y.  
> > > > When  
> > > > > > > we  
> > > > > > > > run  
> > > > > > > > > > testpmd using  -d to point to our PMD we get this error  
> > > > > > > > > > >
> > > > > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed:
> > > > > > > > > > > Invalid  
> > > > argument  
> > > > > > > > > > >
> > > > > > > > > > > This error occurs as a result of the rte mempool ops
> > > > > > > > > > > table  
> > > > having 0  
> > > > > > > > > > entries.  This table is populated from a call to  
> > > > > > > > rte_mempool_register_ops().  
> > > > > > > > > > This function gets called in rte_mempool_ring.c via the
> > > > > > > > > > static  
> > > > > > > > initialization  
> > > > > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in  
> > > librte_mempool_ring.so.  
> > > > > > > However  
> > > > > > > > > > this library is not loaded when the rte_eal_init() gets
> > > > > > > > > > called so  
> > > > the  
> > > > > > > > static  
> > > > > > > > > > initializers are not yet loaded.  
> > > > > > > > > > >
> > > > > > > > > > > I am requesting advice on the proper way to repair this.  
> > > > > > > > >
> > > > > > > > > "-d" the ring library (rte_mempool_ring) - just like any
> > > > > > > > > other  
> > > > shared  
> > > > > > > lib.  
> > > > > > > > >  
> > > > > > > >
> > > > > > > > I think this is a bug that should be fixed. The user should
> > > > > > > > not need  
> > > > to  
> > > > > > > > have to specify a mempool driver just to get testpmd working,
> > > > > > > > so I  
> > > > think  
> > > > > > > > the ring handler as default should be compiled in
> > > > > > > > automatically so as  
> > > > to  
> > > > > > > > allow regular mempools to just work as before.  
> > > > > > >
> > > > > > > For Ring Mempool as default enabled, +1  
> > > > > >
> > > > > > Actually, Ring mempool is enabled by default. But, obviously for
> > > > > > shared  
> > > > library case, this still means "-d".  
> > > > > >  
> > > > >
> > > > > Not necessarily. That only applies if we don't explicitly link it
> > > > > like the other shared libraries. We "special-case" our drivers in
> > > > > that we don't add them with a -l flag, but expect the user to
> > > > > dynamically load them at runtime. This is one case where I think all
> > > > > apps should explicitly link against the ring mempool driver. There
> > > > > is no reason we can't make some drivers mandatory.
> > > > >  
> > > > > > >  
> > > > > > > >  
> > > > > > > > > This change was done recently to move ring handler into its  
> > > > separate  
> > > > > > > > drivers/mempool/ring directory. That also means it no longer
> > > > > > > > is  
> > > > compiled  
> > > > > > > into  
> > > > > > > > the librte_mempool.  
> > > > > > > > >  
> > > > > > > > > >
> > > > > > > > > > We should just add a better error message if no mempool
> > > > > > > > > > driver is  
> > > > > > > > available.  
> > > > > > > > >
> > > > > > > > > Yes, that is something to be improved.  
> > > > > > > >
> > > > > > > > This should be fixed by always having a mempool driver  
> > > installed.  
> > > > > > >
> > > > > > > Agree.  
> > > > > >
> > > > > > Probably, as ring mempool is a driver and compiled in shared mode,  
> > > > enabled by default will not fix this.  
> > > > >
> > > > > But linked in by default will fix it.
> > > > >  
> > > > And as follow-up to my own mail, I think we can actually go further
> > > > here. Mempool is a core library, and very little can be done in DPDK
> > > > without it. It's also not what most people would think as needing a
> > > > driver loaded, so from a usability point of view, I don't see why we
> > > > shouldn't link in all mempool drivers by default, like we do other libs.
> > > > It will make users life easier, and I can't see any downside to doing
> > > > so - they are just .so's after all!  
> > > 
> > > I don't have a particularly strong opinion against this.
> > > For static build, we are already 'there' - mempool would be linked in with
> > > testpmd.
> > > For Shared library, the idea is to have small footprint and leave it to
> > > user to link what is required, and what is not.
> > > 
> > > Still, for usability sakes, we have three options:
> > > 1. Link all library - which might be more than just ring (stack, more to
> > > be added soon...) 2. Only link ring by default - because that is also
> > > being used as default option when creating the mempool (ring_mp_mc) 3.
> > > Don't link any
> > > 
> > > (3) is a cleaner approach, but may not be a good usecase. But, going by
> > > (1) would mean linking in unused mempool handler by default (yes, user
> > > could always say 'n' in config file).
> > > 
> > > So, if we are going to select the mempool as inbuild, we might as well
> > > have it only for Ring (2).
> > > 
> > > It's more important to make DPDK useful than to make it idealistic. :)
> > >   
> > 
> > I'm ok with option 2 or 3.  
> 
> I think the default mempool could be linked.
> I don't know how easy it is to transform
> 	CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS="ring_mp_mc"
> into
> 	-lrte_mempool_ring
> 
> Anyone for a patch?

This is the default mempool for the mbufs, selected when using the
function rte_pktmbuf_pool_create().

For non-mbuf mempools, the default is to use the ring handler (see
in rte_mempool_create()).

So if we want option 2-, it looks that moving this line in rte.app.mk
above, outside the if (shared build), would do the job:

_LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring

I think both 2- and 3- are acceptable. People using the shared library
mode should already provide all the .so in a known location, so that
they are loaded by default. This is needed for the PMDs for instance.


Olivier

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Shreyansh Jain]

On Thursday 13 April 2017 01:25 AM, Olivier MATZ wrote:
> Hi,
>
> On Wed, 12 Apr 2017 14:31:56 +0200
> Thomas Monjalon <thomas.monjalon@6wind.com> wrote:
>
>> 2017-04-12 11:31, Richardson, Bruce:
>>>

[...]

>>
>> I think the default mempool could be linked.
>> I don't know how easy it is to transform
>> 	CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS="ring_mp_mc"
>> into
>> 	-lrte_mempool_ring
>>
>> Anyone for a patch?
>
> This is the default mempool for the mbufs, selected when using the
> function rte_pktmbuf_pool_create().
>
> For non-mbuf mempools, the default is to use the ring handler (see
> in rte_mempool_create()).
>
> So if we want option 2-, it looks that moving this line in rte.app.mk
> above, outside the if (shared build), would do the job:
>
> _LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring
>
> I think both 2- and 3- are acceptable. People using the shared library
> mode should already provide all the .so in a known location, so that
> they are loaded by default. This is needed for the PMDs for instance.
>

I can send the patch;
before that, should this fact, that ring is included by default, is to 
be documented somewhere?

-
Shreyansh

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Thomas Monjalon]

2017-04-13 12:11, Shreyansh Jain:
> On Thursday 13 April 2017 01:25 AM, Olivier MATZ wrote:
> > Hi,
> >
> > On Wed, 12 Apr 2017 14:31:56 +0200
> > Thomas Monjalon <thomas.monjalon@6wind.com> wrote:
> >
> >> 2017-04-12 11:31, Richardson, Bruce:
> >>>
> 
> [...]
> 
> >>
> >> I think the default mempool could be linked.
> >> I don't know how easy it is to transform
> >> 	CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS="ring_mp_mc"
> >> into
> >> 	-lrte_mempool_ring
> >>
> >> Anyone for a patch?
> >
> > This is the default mempool for the mbufs, selected when using the
> > function rte_pktmbuf_pool_create().
> >
> > For non-mbuf mempools, the default is to use the ring handler (see
> > in rte_mempool_create()).
> >
> > So if we want option 2-, it looks that moving this line in rte.app.mk
> > above, outside the if (shared build), would do the job:
> >
> > _LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring
> >
> > I think both 2- and 3- are acceptable. People using the shared library
> > mode should already provide all the .so in a known location, so that
> > they are loaded by default. This is needed for the PMDs for instance.
> >
> 
> I can send the patch;
> before that, should this fact, that ring is included by default, is to 
> be documented somewhere?

Yes good idea.
Instead of "included", you could say "linked" without the need for -d option.

But actually, the mempool drivers are not documented.
We should totally update this section:
	http://dpdk.org/doc/guides/prog_guide/mempool_lib.html#mempool-handlers
So it should be another patch.

Re: error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y

[Ananyev, Konstantin]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Shreyansh Jain
> Sent: Wednesday, April 12, 2017 12:02 PM
> To: Richardson, Bruce <bruce.richardson@intel.com>
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller <john.miller@atomicrules.com>; dev@dpdk.org;
> olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> 
> > -----Original Message-----
> > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Sent: Wednesday, April 12, 2017 4:12 PM
> > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > Subject: Re: [dpdk-dev] error in testpmd when CONFIG_RTE_BUILD_SHARED_LIB=y
> >
> > On Wed, Apr 12, 2017 at 11:38:55AM +0100, Bruce Richardson wrote:
> > > On Wed, Apr 12, 2017 at 10:33:10AM +0000, Shreyansh Jain wrote:
> > > > My bad - I was too quick in replying - some clarification beneath.
> > > >
> > > > > -----Original Message-----
> > > > > From: Shreyansh Jain
> > > > > Sent: Wednesday, April 12, 2017 3:55 PM
> > > > > To: 'Bruce Richardson' <bruce.richardson@intel.com>
> > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > > Subject: RE: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > > > > > Sent: Wednesday, April 12, 2017 3:35 PM
> > > > > > To: Shreyansh Jain <shreyansh.jain@nxp.com>
> > > > > > Cc: Thomas Monjalon <thomas.monjalon@6wind.com>; john miller
> > > > > > <john.miller@atomicrules.com>; dev@dpdk.org; olivier.matz@6wind.com
> > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > >
> > > > > > On Wed, Apr 12, 2017 at 04:52:47AM +0000, Shreyansh Jain wrote:
> > > > > > > > -----Original Message-----
> > > > > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > > > Sent: Wednesday, April 12, 2017 12:58 AM
> > > > > > > > To: john miller <john.miller@atomicrules.com>
> > > > > > > > Cc: dev@dpdk.org; olivier.matz@6wind.com; Shreyansh Jain
> > > > > > > > <shreyansh.jain@nxp.com>
> > > > > > > > Subject: Re: [dpdk-dev] error in testpmd when
> > > > > > CONFIG_RTE_BUILD_SHARED_LIB=y
> > > > > > > >
> > > > > > > > 2017-04-11 14:02, john miller:
> > > > > > > > >
> > > > > > > > > We are seeing an issue when running from the head of the master
> > > > > branch
> > > > > > in
> > > > > > > > dpdk-next-net and building with CONFIG_RTE_BUILD_SHARED_LIB=y.
> > When
> > > > > we
> > > > > > run
> > > > > > > > testpmd using  -d to point to our PMD we get this error
> > > > > > > > >
> > > > > > > > > EAL: Error - exiting with code: 1
> > > > > > > > >   Cause: Creation of mbuf pool for socket 0 failed: Invalid
> > argument
> > > > > > > > >
> > > > > > > > > This error occurs as a result of the rte mempool ops table
> > having 0
> > > > > > > > entries.  This table is populated from a call to
> > > > > > rte_mempool_register_ops().
> > > > > > > > This function gets called in rte_mempool_ring.c via the static
> > > > > > initialization
> > > > > > > > MACRO MEMPOOL_REGISTER_OPS and exists in librte_mempool_ring.so.
> > > > > However
> > > > > > > > this library is not loaded when the rte_eal_init() gets called so
> > the
> > > > > > static
> > > > > > > > initializers are not yet loaded.
> > > > > > > > >
> > > > > > > > > I am requesting advice on the proper way to repair this.
> > > > > > >
> > > > > > > "-d" the ring library (rte_mempool_ring) - just like any other
> > shared
> > > > > lib.
> > > > > > >
> > > > > >
> > > > > > I think this is a bug that should be fixed. The user should not need
> > to
> > > > > > have to specify a mempool driver just to get testpmd working, so I
> > think
> > > > > > the ring handler as default should be compiled in automatically so as
> > to
> > > > > > allow regular mempools to just work as before.
> > > > >
> > > > > For Ring Mempool as default enabled, +1
> > > >
> > > > Actually, Ring mempool is enabled by default. But, obviously for shared
> > library case, this still means "-d".
> > > >
> > >
> > > Not necessarily. That only applies if we don't explicitly link it like
> > > the other shared libraries. We "special-case" our drivers in that we
> > > don't add them with a -l flag, but expect the user to dynamically load
> > > them at runtime. This is one case where I think all apps should
> > > explicitly link against the ring mempool driver. There is no reason we
> > > can't make some drivers mandatory.
> > >
> > > > >
> > > > > >
> > > > > > > This change was done recently to move ring handler into its
> > separate
> > > > > > drivers/mempool/ring directory. That also means it no longer is
> > compiled
> > > > > into
> > > > > > the librte_mempool.
> > > > > > >
> > > > > > > >
> > > > > > > > We should just add a better error message if no mempool driver is
> > > > > > available.
> > > > > > >
> > > > > > > Yes, that is something to be improved.
> > > > > >
> > > > > > This should be fixed by always having a mempool driver installed.
> > > > >
> > > > > Agree.
> > > >
> > > > Probably, as ring mempool is a driver and compiled in shared mode,
> > enabled by default will not fix this.
> > >
> > > But linked in by default will fix it.
> > >
> > And as follow-up to my own mail, I think we can actually go further
> > here. Mempool is a core library, and very little can be done in DPDK
> > without it. It's also not what most people would think as needing a
> > driver loaded, so from a usability point of view, I don't see why we
> > shouldn't link in all mempool drivers by default, like we do other libs.
> > It will make users life easier, and I can't see any downside to doing
> > so - they are just .so's after all!
> 
> I don't have a particularly strong opinion against this.
> For static build, we are already 'there' - mempool would be linked in with testpmd.
> For Shared library, the idea is to have small footprint and leave it to user to link what is required, and what is not.
> 
> Still, for usability sakes, we have three options:
> 1. Link all library - which might be more than just ring (stack, more to be added soon...)
> 2. Only link ring by default - because that is also being used as default option when creating the mempool (ring_mp_mc)
> 3. Don't link any
> 
> (3) is a cleaner approach, but may not be a good usecase. But, going by (1) would mean linking in unused mempool handler by default (yes,
> user could always say 'n' in config file).
> 
> So, if we are going to select the mempool as inbuild, we might as well have it only for Ring (2).

My vote would be for option 2.
Konstantin