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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Hemant Agrawal <hemant.agrawal@oss.nxp.com>,
	"Di, ChenxuX" <chenxux.di@intel.com>,
	"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>
Cc: "sachin.saxena@nxp.com" <sachin.saxena@nxp.com>,
	"stable@dpdk.org" <stable@dpdk.org>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] net/dpaa2: fix build error about timesync functions
Date: Thu, 17 Sep 2020 12:59:08 +0100
Message-ID: <f7c48746-8e16-3053-da81-097d7d7bfd21@intel.com> (raw)
In-Reply-To: <a70b06ed-952d-48a8-4aac-d81424e41b85@oss.nxp.com>

On 9/17/2020 12:50 PM, Hemant Agrawal wrote:
> 
> On 9/17/2020 5:08 PM, Ferruh Yigit wrote:
>> On 9/17/2020 3:03 AM, Di, ChenxuX wrote:
>>> Hi,
>>>
>>>> -----Original Message-----
>>>> From: Ferruh Yigit <ferruh.yigit@intel.com>
>>>> Sent: Wednesday, September 16, 2020 11:29 PM
>>>> To: Di, ChenxuX <chenxux.di@intel.com>; hemant.agrawal@nxp.com
>>>> Cc: sachin.saxena@nxp.com; stable@dpdk.org; dev@dpdk.org; Richardson,
>>>> Bruce <bruce.richardson@intel.com>
>>>> Subject: Re: [dpdk-stable] [PATCH] net/dpaa2: fix build error about 
>>>> timesync
>>>> functions
>>>>
>>>> On 9/15/2020 3:40 AM, Chenxu Di wrote:
>>>>> When the build option has '-DRTE_LIBRTE_IEEE1588=1', the announce of
>>>>> timesync functions will be build.
>>>>> However the dpdk_conf doesn't hav RTE_LIBRTE_IEEE1588 so that the file
>>>>> dpaa2_ptp.c will not be build.
>>>>> It cause the build error.
>>>>> This patch fixes it by adding set for dpdk_conf.
>>>>>
>>>>> Fixes: 184c39d16568 ("net/dpaa2: add DPRTC sub-module")
>>>>> Cc: stable@dpdk.org
>>>>>
>>>>> Signed-off-by: Chenxu Di <chenxux.di@intel.com>
>>>>> ---
>>>>>    drivers/net/dpaa2/meson.build | 4 ++++
>>>>>    1 file changed, 4 insertions(+)
>>>>>
>>>>> diff --git a/drivers/net/dpaa2/meson.build
>>>>> b/drivers/net/dpaa2/meson.build index 6dd0eb274..d9aadfdae 100644
>>>>> --- a/drivers/net/dpaa2/meson.build
>>>>> +++ b/drivers/net/dpaa2/meson.build
>>>>> @@ -17,6 +17,10 @@ sources = files('base/dpaa2_hw_dpni.c',
>>>>>            'mc/dpdmux.c',
>>>>>            'mc/dpni.c')
>>>>>
>>>>> +if '-DRTE_LIBRTE_IEEE1588=1' in get_option('c_args')
>>>>
>>>> The "RTE_LIBRTE_IEEE1588=1" can fail,
>>>> all places looking for "#ifdef RTE_LIBRTE_IEEE1588", so a "-Dc_args=-
>>>> DRTE_LIBRTE_IEEE1588" is more likely, but why not "-Dc_args=-
>>>> DRTE_LIBRTE_IEEE1588=666"
>>>>
>>>
>>> Yes, I will change it
>>>
>>>>> + dpdk_conf.set('RTE_LIBRTE_IEEE1588', 1) endif
>>>>> +
>>>>>    if dpdk_conf.has('RTE_LIBRTE_IEEE1588')
>>>>>        sources += files('mc/dprtc.c')
>>>>>        sources += files('dpaa2_ptp.c')
>>>>>
>>>>
>>>> Can't we just remove the conditional build:
>>>>
>>>>    -if dpdk_conf.has('RTE_LIBRTE_IEEE1588')
>>>>    -       sources += files('mc/dprtc.c')
>>>>    -       sources += files('dpaa2_ptp.c')
>>>>    -endif
>>>>    +sources += files('mc/dprtc.c')
>>>>    +sources += files('dpaa2_ptp.c')
>>>
>>> The announce of timesync functions are in the #define 
>>> DRTE_LIBRTE_IEEE1588
>>> While the define of the functions are in the file 'dpaa2_ptp.c'.
>>> So they should be both build or not build by whether the build option 
>>> -DRTE_LIBRTE_IEEE1588=1 or not.
>>> So it seems not a good idea that remove the conditional.
>>>
>>
>> timesyncs_* dev_ops functions defined but not used is not big problem, 
>> only can increase the library size.
>>
>> I believe more concern is on:
>> 'RTE_PMD_REGISTER_DPAA2_OBJECT(dprtc, rte_dpaa2_dprtc_obj);'
>> which looks like register function to run in constructor when 
>> 'dpaa2_ptp.c' is compiled, but not sure affect of it.
>> It can be possible to wrap that call with 'RTE_LIBRTE_IEEE1588' ifdef, 
>> that should work.
>>
>> It is preferred to remove the compile time flag instead of finding 
>> ways to make it work.
>>
>> Let's wait for the dpaa2 maintainers' response, perhaps they can come 
>> with a smart way to remove the compile time flag.
> 
> Hi Ferruh,
> 
>     enabling  IEEE1588 causes some performance drop in the dpaa2 
> performance. That is the reason, we have kept this code in compile time 
> flag.
> 
> 
> However, we will work in future to make it run-time configurable but 
> that will require some code restructuring and it will be a moderate size 
> work.
> 

OK, thanks Hemant.

At least can it be possible to remove it from the build files, what do 
you think about wrapping those two files (or their relevant parts) with 
'RTE_LIBRTE_IEEE1588' ifdef and remove the checks from meson file?


  reply	other threads:[~2020-09-17 11:59 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15  2:40 [dpdk-stable] " Chenxu Di
2020-09-15  3:22 ` Hemant Agrawal
2020-09-16  5:12 ` [dpdk-stable] [dpdk-dev] " Zhou, JunX W
2020-09-16 15:29 ` [dpdk-stable] " Ferruh Yigit
2020-09-17  2:03   ` Di, ChenxuX
2020-09-17 11:38     ` Ferruh Yigit
2020-09-17 11:50       ` [dpdk-stable] [dpdk-dev] " Hemant Agrawal
2020-09-17 11:59         ` Ferruh Yigit [this message]
2020-09-17 15:40           ` Hemant Agrawal
2020-09-30 15:09             ` Ferruh Yigit
2020-09-17  8:43 ` [dpdk-stable] [PATCH v2] " Chenxu Di
2020-09-17 11:48   ` [dpdk-stable] [dpdk-dev] " Hemant Agrawal
2020-10-06 17:16   ` [dpdk-stable] [PATCH v3] " Ferruh Yigit
2020-10-08  2:24     ` Sachin Saxena (OSS)
2020-10-08 13:12       ` Ferruh Yigit
2020-10-09  7:48         ` Sachin Saxena (OSS)
2020-10-09 11:22           ` Ferruh Yigit

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