[dpdk-dev] [PATCH 0/2] Multiple Pktmbuf mempool support
hemant.agrawal at nxp.com
Tue Oct 10 16:21:01 CEST 2017
On 10/10/2017 7:45 PM, Thomas Monjalon wrote:
> 25/09/2017 12:24, Olivier MATZ:
>> Hi Hemant,
>> On Fri, Sep 22, 2017 at 12:43:36PM +0530, Hemant Agrawal wrote:
>>> On 7/4/2017 5:52 PM, Hemant Agrawal wrote:
>>>> This patch is in addition to the patch series submitted by
>>>> Santosh to allow application to set mempool handle.
>>>> The existing pktmbuf pool create api only support the internal use
>>>> of "CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS", which assumes that the HW
>>>> can only support one type of mempool for packet mbuf.
>>>> There are multiple additional requirements.
>>>> 1. The platform independent image detects the underlying bus,
>>>> based on the bus and resource detected, it will dynamically select
>>>> the default mempool. This need not to have the application knowlege.
>>>> e.g. DPAA2 and DPAA are two different NXP platforms, based on the
>>>> underlying platform the default ops for mbuf can be dpaa or dpaa2.
>>>> Application should work seemlessly whether it is running on dpaa or dpaa2.
>>>> 2.Platform support more than one type of mempool for pktmbuf,
>>>> depend on the availability of resource, the driver can decide one
>>>> of the mempool for the current packet mbuf request.
>>>> 3. In case of where application is providing the mempool, as proposed
>>>> in , the check preference logic will be bypassed and application
>>>> config will take priority.
>>>> Allow application set mempool handle
>>>> Hemant Agrawal (2):
>>>> mempool: check the support for the given mempool
>>>> mbuf: add support for preferred mempool list
>>>> config/common_base | 2 ++
>>>> lib/librte_mbuf/rte_mbuf.c | 28 +++++++++++++++++++++++-----
>>>> lib/librte_mempool/rte_mempool.h | 24 ++++++++++++++++++++++++
>>>> lib/librte_mempool/rte_mempool_ops.c | 32 ++++++++++++++++++++++++++++++++
>>>> 4 files changed, 81 insertions(+), 5 deletions(-)
>>> Hi Olivier,
>>> Any opinion on this patchset?
>> Sorry for the lack of feedback, for some reason I missed the initial
>> I don't quite like the idea of having hardcoded config:
>> Also, I'm a bit reserved about rte_mempool_ops_check_support(): it can
>> return "supported" but the creation of the pool can still fail later due
>> to the creation parameters (element count/size, mempool flags, ...).
>> The ordering preference of these mempool ops may also depend on the
>> configuration (enabled ports for instance) or user choices.
>> Let me propose you another approach to (I hope) solve your issue, based
>> on Santosh's patches .
>> We can introduce a new helper that could be used by applications to
>> dynamically select the best mempool ops. It could be something similar
>> to the pseudo-code I've written in .
>> // return an array pool ops name, ordered by preference
>> pool_ops = get_ordered_pool_ops_list()
>> Then try to create the first pool, if it fails, try the next, until
>> it is succesful.
>> That said, it is difficult to take the good decision inside
>> rte_pktmbuf_pool_create() because we don't have all the information.
>> Sergio and Jerin suggested to introduce a new argument ops_name to
>> rte_pktmbuf_pool_create() . From what I remember, this is also
>> something you were in favor of, right?
>> In that case, we can move the difficult task of choosing the
>> right mempool inside the application.
> I guess this discussion is obsolete since Santosh commit?
Not yet. On the basis of our discussion with Olivier and Santosh
commit, we are working out a way, which solves our issue.
We will close on it in next few days.
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