From: Olivier MATZ <olivier.matz@6wind.com>
To: santosh <santosh.shukla@caviumnetworks.com>
Cc: dev@dpdk.org, thomas@monjalon.net,
jerin.jacob@caviumnetworks.com, hemant.agrawal@nxp.com
Subject: Re: [dpdk-dev] [PATCH v4 2/2] ethdev: get the supported pools for a port
Date: Fri, 29 Sep 2017 13:23:25 +0200 [thread overview]
Message-ID: <20170929112324.5etpxbgif2pbh7pp@platinum> (raw)
In-Reply-To: <ceb160fa-29d6-50e8-c780-8eb182da92e9@caviumnetworks.com>
On Fri, Sep 29, 2017 at 11:16:20AM +0100, santosh wrote:
> Hi Olivier,
>
>
> On Friday 29 September 2017 09:32 AM, Olivier MATZ wrote:
> > On Mon, Sep 25, 2017 at 10:52:31PM +0100, santosh wrote:
> >> Hi Olivier,
> >>
> >>
> >> On Monday 25 September 2017 08:37 AM, Olivier MATZ wrote:
> >>
> >>>> +{
> >>>> + struct rte_eth_dev *dev;
> >>>> + const char *tmp;
> >>>> +
> >>>> + RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
> >>>> +
> >>>> + if (pool == NULL)
> >>>> + return -EINVAL;
> >>>> +
> >>>> + dev = &rte_eth_devices[port_id];
> >>>> +
> >>>> + if (*dev->dev_ops->pools_ops_supported == NULL) {
> >>>> + tmp = rte_eal_mbuf_default_mempool_ops();
> >>>> + if (!strcmp(tmp, pool))
> >>>> + return 0;
> >>>> + else
> >>>> + return -ENOTSUP;
> >>> I don't understand why we are comparing with
> >>> rte_eal_mbuf_default_mempool_ops().
> >>>
> >>> It means that the result of the function would be influenced
> >>> by the parameter given by the user.
> >> But that will be only for ops not supported case and in that case,
> >> function _must_ make sure that if inputted param is _default_ops_name
> >> then function should return ops supported correct info (whether
> >> returning '0' : Best ops or '1': ops does support
> >> , this part is arguable.. meaning One can say that default_ops ='handle-name' is best possible handle Or
> >> one of handle which platform supports).
> >>
> >>> I think that a PMD that does not implement ->pools_ops_supported
> >>> should always return 1 (mempool is supported).
> > I don't agree.
> > The result of this API (mempool ops supported or not by a PMD)
> > should not depend on what user asks for.
> >
> >> Return 1 says: PMD support this ops..
> >>
> >> So if ops is not supported and func returns with 1, then which ops application will use?
> >> If that ops is default_ops.. then How application will distinguish when to use default ops or
> >> param ops?.. as because in both cases func will return with value 1.
> >>
> >> The approach in the patch takes care of that condition and func will return -ENOTSUP
> >> if (ops not support || inputted param not matching with default ops) otherwise will return
> >> 0 or 1.
> >>
> >> At application side;
> >> For error case: In case of -ENOTSUP, its upto application to use _default_ops or exit.
> >> For good case: 0 or 1 case, func gaurantee that handle is either best handle for pool or pool supports
> >> that handle.. However in your suggestion if ops not supported case returns 1 then application is not
> >> sure which ops to use.. default_ops Or input ops given to func.
> >>
> >> make sense?
> > My proposition is:
> >
> > - what a PMD returns does not depend on used parameter:
> > - 0: best support
> > - 1: support
> > - -ENOTSUP: not supported
> >
> > - if a PMD does not implement the _ops_supported() API, assume all pools
> > are supported (returns 1)
>
> If API returns 1 for PMD does not implement _ops_supported() case,
> then do we really need -ENOTSUP?
When the PMD explicitly does not support a mempool ops.
Not implementing the API means, like today: "I don't care what
the mempool ops is, so I a priori support all the ones available,
without preference".
next prev parent reply other threads:[~2017-09-29 11:23 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-01 8:05 [dpdk-dev] [PATCH 0/2] Allow application set mempool handle Santosh Shukla
2017-06-01 8:05 ` [dpdk-dev] [PATCH 1/2] eal: Introducing option to " Santosh Shukla
2017-06-30 14:12 ` Olivier Matz
2017-07-04 12:33 ` santosh
2017-06-01 8:05 ` [dpdk-dev] [PATCH 2/2] ether/ethdev: Allow pmd to advertise preferred pool capability Santosh Shukla
2017-06-30 14:13 ` Olivier Matz
2017-07-04 12:39 ` santosh
2017-07-04 13:07 ` Olivier Matz
2017-07-04 14:12 ` Jerin Jacob
2017-06-19 11:52 ` [dpdk-dev] [PATCH 0/2] Allow application set mempool handle Hemant Agrawal
2017-06-19 13:01 ` Jerin Jacob
2017-06-20 10:37 ` Hemant Agrawal
2017-06-20 14:04 ` Jerin Jacob
2017-06-30 14:12 ` Olivier Matz
2017-07-04 12:25 ` santosh
2017-07-04 15:59 ` Olivier Matz
2017-07-05 7:48 ` santosh
2017-07-20 7:06 ` [dpdk-dev] [PATCH v2 0/2] Dynamically configure " Santosh Shukla
2017-07-20 7:06 ` [dpdk-dev] [PATCH v2 1/2] eal: allow user to override default pool handle Santosh Shukla
2017-08-15 8:07 ` [dpdk-dev] [PATCH v3 0/2] Dynamically configure mempool handle Santosh Shukla
2017-08-15 8:07 ` [dpdk-dev] [PATCH v3 1/2] eal: allow user to override default pool handle Santosh Shukla
2017-09-04 11:46 ` Olivier MATZ
2017-09-07 9:25 ` Hemant Agrawal
2017-08-15 8:07 ` [dpdk-dev] [PATCH v3 2/2] ethdev: allow pmd to advertise " Santosh Shukla
2017-09-04 12:11 ` Olivier MATZ
2017-09-04 13:14 ` santosh
2017-09-07 9:21 ` Hemant Agrawal
2017-09-07 10:06 ` santosh
2017-09-07 10:11 ` santosh
2017-09-07 11:08 ` Hemant Agrawal
2017-09-11 9:33 ` Olivier MATZ
2017-09-11 12:40 ` santosh
2017-09-11 13:00 ` Olivier MATZ
2017-09-04 9:41 ` [dpdk-dev] [PATCH v3 0/2] Dynamically configure mempool handle Sergio Gonzalez Monroy
2017-09-04 13:20 ` santosh
2017-09-04 13:34 ` Olivier MATZ
2017-09-04 14:24 ` Sergio Gonzalez Monroy
2017-09-05 7:47 ` Olivier MATZ
2017-09-05 8:11 ` Jerin Jacob
2017-09-11 15:18 ` [dpdk-dev] [PATCH v4 " Santosh Shukla
2017-09-11 15:18 ` [dpdk-dev] [PATCH v4 1/2] eal: allow user to override default pool handle Santosh Shukla
2017-09-25 7:28 ` Olivier MATZ
2017-09-25 21:23 ` santosh
2017-09-11 15:18 ` [dpdk-dev] [PATCH v4 2/2] ethdev: get the supported pools for a port Santosh Shukla
2017-09-25 7:37 ` Olivier MATZ
2017-09-25 21:52 ` santosh
2017-09-29 5:00 ` santosh
2017-09-29 8:32 ` Olivier MATZ
2017-09-29 10:16 ` santosh
2017-09-29 11:21 ` santosh
2017-09-29 11:23 ` Olivier MATZ [this message]
2017-09-29 11:31 ` santosh
2017-09-13 10:00 ` [dpdk-dev] [PATCH v4 0/2] Dynamically configure mempool handle santosh
2017-09-19 8:28 ` santosh
2017-09-25 7:24 ` Olivier MATZ
2017-09-25 21:58 ` santosh
2017-10-01 9:14 ` [dpdk-dev] [PATCH v5 " Santosh Shukla
2017-10-01 9:14 ` [dpdk-dev] [PATCH v5 1/2] eal: allow user to override default pool handle Santosh Shukla
2017-10-02 14:29 ` Olivier MATZ
2017-10-06 0:29 ` Thomas Monjalon
2017-10-06 3:31 ` santosh
2017-10-06 8:39 ` Thomas Monjalon
2017-10-06 7:45 ` [dpdk-dev] [PATCH v6 0/2] Dynamically configure mempool handle Santosh Shukla
2017-10-06 7:45 ` [dpdk-dev] [PATCH v6 1/2] eal: allow user to override default pool handle Santosh Shukla
2017-10-06 7:45 ` [dpdk-dev] [PATCH v6 2/2] ethdev: get the supported pool for a port Santosh Shukla
2017-10-06 18:58 ` [dpdk-dev] [PATCH v6 0/2] Dynamically configure mempool handle Thomas Monjalon
2017-10-01 9:14 ` [dpdk-dev] [PATCH v5 2/2] ethdev: get the supported pool for a port Santosh Shukla
2017-10-02 14:31 ` Olivier MATZ
2017-10-06 0:30 ` Thomas Monjalon
2017-10-06 3:32 ` santosh
2017-10-02 8:37 ` [dpdk-dev] [PATCH v5 0/2] Dynamically configure mempool handle santosh
2017-07-20 7:06 ` [dpdk-dev] [PATCH v2 2/2] ethdev: allow pmd to advertise pool handle Santosh Shukla
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