[dpdk-users] If shared libraries are used vdev doesn't work anymore

Dirk-Holger Lenz dirk.lenz at ng4t.com
Wed Aug 2 16:11:00 CEST 2017

patch tested by dirk.lenz and works for one virtual device

On 08/01/2017 11:32 AM, Thomas Monjalon wrote:
> 01/08/2017 10:17, Gaëtan Rivet:
>> Hi,
>> On Mon, Jul 31, 2017 at 10:23:50PM +0200, Thomas Monjalon wrote:
>>> 31/07/2017 16:58, Dirk-Holger Lenz:
>>>> If dpdk is built with 'CONFIG_RTE_BUILD_SHARED_LIB=y' then
>>>> using the vdev feature (args: e.g. -c 3 -n 4 --vdev="crypto_openssl")
>>>> the rte_eal_init() returns 'ERROR: failed to parse device "crypto_openssl"'.
>>>> It looks to me that rte_eal_devargs_add() calling rte_eal_devargs_parse()
>>>> is trying to check the device name before the shared libraries are read
>>>> and the internal data arrays are setup.
>>> Yes, you're right: eal_parse_args() is called before eal_plugins_init().
>>> The fix is not small: we should split the args parsing to parse the
>>> device arguments after loading shared libraries.
>>> It is a release blocker.
>> I saw that yesterday, tried to investigate a bit.
>> I have currently an issue when launching testpmd when
>> BUILD_SHARED_LIB=y. Mbufs fail to be allocated. I was not able to find
>> the root cause for this.
> Have you loaded the mempool driver?
>> Anyway, I guess there are two possible solutions:
>>    - Delayed device validation
>>    - Earlier plugins init
>> Thomas you seem to propose the first one, I agree that it will probably
>> be a little involved to implement but I guess it's feasible in time.
>> However, I don't yet understand why the second one is not possible from
>> the get-go. It makes sense in any case that the system should be
>> stabilized as soon as possible - i.e. that underlying subsystems such as
>> plugins and capabilities are loaded first to expose a stable set of
>> capabilities to any subsequent initializations.
> The problem is that the plugins initialization depends on tailqs, log
> and memory initialization.
>> So, I will lack time to investigate the issue with testpmd and shared
>> libs. If anyone has any idea, I will gladly hear it. In the meantime, I
>> will test those two solutions, see what would be feasible, and try to
>> propose one shortly.
> Thank you

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