[dpdk-dev] rte_eth_rx_burst stops running on dpdk extlib

[Jose Gavine Cueto]

Hi Prashant,

Thanks, I will investigate. Though the following is how the pktdump
application and pmd lib ext are built, just to give you an overview.

*pmd lib Makefile*

include $(RTE_SDK)/mk/rte.vars.mk

LIB = libpmd.a

CFLAGS += -O3
CFLAGS += $(WERROR_FLAGS)

SRCS-y := ... sources here


include $(RTE_SDK)/mk/rte.extlib.mk
:
*pktdump app Makefile*
*
*
include $(RTE_SDK)/mk/rte.vars.mk

APP = pktdump

LDFLAGS += -lpmd

CFLAGS += -O3
CFLAGS += $(WERROR_FLAGS)
CFLAGS += -I$(IDIR)
CFLAGS += -g

SRCS-y := pktdump.c

include $(RTE_SDK)/mk/rte.extapp.mk

So I'm basically using simple Makefiles for both the lib and app (
rte.extlib.mk, rte.extapp.mk).

Thanks,
Pepe


On Wed, Oct 30, 2013 at 3:13 PM, Prashant Upadhyaya <
prashant.upadhyaya at aricent.com> wrote:

>  Hi Pepe,****
>
> ** **
>
> Please also make sure that you are following the correct makefile
> templates (as present in examples) when you build your app separately.****
>
> If you don’t, then you will naturally miss out on some flags and that can
> prove fatal because your app will see some code differently in the header
> files of rte than what the library was built with based on the compiler
> flags.****
>
> ** **
>
> Regards****
>
> -Prashant****
>
> ** **
>
> ** **
>
> *From:* Jose Gavine Cueto [mailto:pepedocs at gmail.com]
> *Sent:* Wednesday, October 30, 2013 12:34 PM
> *To:* Prashant Upadhyaya
> *Cc:* dev at dpdk.org
>
> *Subject:* Re: [dpdk-dev] rte_eth_rx_burst stops running on dpdk extlib***
> *
>
> ** **
>
> Hi Prashant,****
>
> ** **
>
> Are you referring to the rte_* libraries ?  I had actually compiled them
> using the setup script ($(RTE_SDK)/tools/setup.sh) and then linked the PMD
> lib extension I've made and then linked the pktdump eventually, before
> seeing the problem.  However, building it all as an app. didn't show any
> issue.****
>
> ** **
>
> I will try to redo the building/linking just to make sure.  ****
>
> ** **
>
> Thank you!****
>
> ** **
>
> On Wed, Oct 30, 2013 at 2:57 PM, Prashant Upadhyaya <
> prashant.upadhyaya at aricent.com> wrote:****
>
> Hi Pepe,
>
> How about this -- compile the libraries yourself and then link your
> application with them just like the original usecase where you find the
> problem.
> If this works, then the problem is with the precompiled libraries you were
> picking from somewhere.
>
> Regards
> -Prashant****
>
>
>
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jose Gavine Cueto
> Sent: Wednesday, October 30, 2013 12:22 PM
> To: dev at dpdk.org
> Subject: Re: [dpdk-dev] rte_eth_rx_burst stops running on dpdk extlib
>
> Hi,
>
> Could someone help me ?  Or at least let me know if what I'm doing (diagram
> above) is right with regard to using a external dpdk library ?  I assume
> dpdk external libraries can be treated as norma C libraries.
>
> Cheers,
> Pepe
>
>
> On Wed, Oct 30, 2013 at 8:18 AM, Jose Gavine Cueto <pepedocs at gmail.com
> >wrote:
>
> > Hi,
> >
> > I'm writing a very simple packet dump application that can be
> > described by the following diagram:
> >
> >  ---------------------------
> > |        pktdump        |
> >  ----------------------------
> > | PMD lib extension |
> > |         (extlib)          |
> >  ----------------------------
> > | DPDK PMD lib      |
> >  ----------------------------
> >
> > pktdump - very simple app. built with gcc and linked with pmd lib
> > extension and dpdk libs.
> > pmd lib extension - an extension of dpdk pmd library, which provides
> > some higher-level APIs dpdk pmd lib - pmd lib provided by Intel
> >
> > I have an issue where in when I run the pktdump app. it's lcore
> > threads stops executing at varying number of times.  Sometimes it
> doesn't even run.
> > But this only happens if I use the PMD lib extension.  On the other
> > hand, if pktdump is directly built with pmd lib extension code while
> > pmd lib extension is built as an extapp, it works very well.  I wonder
> > what's the difference, code-wise there is none, the only difference I
> > can see is how they are built (extapp, extlib).
> >
> > The pmd lib extension's lcore threads basically do simple forwarding
> > (rx
> > -> tx).  So rte_eth_rx_burst is called when receiving packets and
> > rte_eth_tx_burst when transmitting packets.  These runs on an lcore
> thread.
> >
> > snippet of code that runs on lcore:
> >
> > void burst_fwd(...){
> >  num_rx = rte_eth_rx_burst(...)
> >  ...
> >  rte_eth_tx_burst(...)
> > }
> >
> > Any tips on how to debug this, some quick inspections may help.  Is
> > there some specific build options for building libraries, because this
> > only happens on extlib.
> >
>
>
>
> --
> To stop learning is like to stop loving.
>
>
>
> ****
>
>
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>
> ****
>
> ** **
>
> --
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>
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>
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To stop learning is like to stop loving.