Re: [RFC] Link ibrte_vhost to librte_pmd_vhost

[Tetsuya Mukawa <mukawa@igel.co.jp>]

On 2016/04/25 18:28, Panu Matilainen wrote:
> On 04/25/2016 12:05 PM, Tetsuya Mukawa wrote:
>> Hi Yuanhan,
>>
>> I want to apply a patch to vhost PMD.
>> Before submitting, could you please let me know your guess about the
>> patch?
>>
>> Here is my problem.
>> I am using below shared library configuration to build my application.
>> CONFIG_RTE_BUILD_SHARED_LIB=y
>> Normally, My application doesn't need vhost facilities, so librte_vhost
>> isn't linked while compiling.
>>
>> Sometimes, I need to use vhost PMD, so I just want to add '-d
>> librte_pmd_vhost.so' to DPDK command line to load vhost PMD library.
>> But my application doesn't have librte_vhost, then I've got an error
>> about it.
>> Even if specify like "-d librte_vhost -d librte_pmd_vhost", I still have
>> an error.
>> Probably this is because above libraries will be dlopen(ed) with
>> RTLD_LOCAL option.
>>
>> Here, I have 2 choices.
>> One is linking librte_vhost to my application while compiling, even if I
>> don't need it normally.
>> This is the way all DPDK examples did. But I am wondering if I should
>> follow this.
>>
>> Another way is applying a below patch.
>> --- a/drivers/net/vhost/Makefile
>> +++ b/drivers/net/vhost/Makefile
>> @@ -38,6 +38,7 @@ LIB = librte_pmd_vhost.a
>>
>>   CFLAGS += -O3
>>   CFLAGS += $(WERROR_FLAGS)
>> +LDLIBS += -lrte_vhost
>>
>>   EXPORT_MAP := rte_pmd_vhost_version.map
>>
>> This is same way to link libpcap to librte_pmd_pcap.
>> What do you think about adding it to vhost PMD?
>
> Yes, this is absolutely the right thing to do.
>
> Ultimately this should be done for all dependencies in all libraries,
> but missing dependencies are even more pronounced in plugins so the
> sooner this goes in, the better.
>
> Acked-by: Panu Matilainen <pmatilai@redhat.com>
>
>     - Panu -

Hi Panu,

I appreciate your comment.
I will send it as a patch tomorrow.
It seems I cannot connect to DPDK git repository so far. So I cannot
test it with latest code.

Thanks,
Tetsuya

>
>
>>
>> Thanks,
>> Tetsuya
>>
>