From: Arnon Warshavsky <arnon@qwilt.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: "Wiles, Keith" <keith.wiles@intel.com>,
Panu Matilainen <pmatilai@redhat.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
Thomas Monjalon <thomas.monjalon@6wind.com>,
Yuanhan Liu <yuanhan.liu@linux.intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"Tan, Jianfeng" <jianfeng.tan@intel.com>,
Stephen Hemminger <stephen@networkplumber.org>,
Christian Ehrhardt <christian.ehrhardt@canonical.com>,
Olivier Matz <olivier.matz@6wind.com>
Subject: Re: [dpdk-dev] [RFC] Yet another option for DPDK options
Date: Fri, 3 Jun 2016 21:52:40 +0300 [thread overview]
Message-ID: <CAKy9EB2imz7S6h_UY2U9_V9iU5mvncfQRb3RGs+Uz9+ct5_10Q@mail.gmail.com> (raw)
In-Reply-To: <20160603183819.GD12627@hmsreliant.think-freely.org>
On Fri, Jun 3, 2016 at 9:38 PM, Neil Horman <nhorman@tuxdriver.com> wrote:
> On Fri, Jun 03, 2016 at 06:29:13PM +0000, Wiles, Keith wrote:
> >
> > On 6/3/16, 12:44 PM, "Neil Horman" <nhorman@tuxdriver.com> wrote:
> >
> > >On Fri, Jun 03, 2016 at 04:04:14PM +0000, Wiles, Keith wrote:
> > >> Sorry, I deleted all of the text as it was getting a bit long.
> > >>
> > >> Here are my thoughts as of now, which is a combination of many
> suggestions I read from everyone’s emails. I hope this is not too hard to
> understand.
> > >>
> > >> - Break out the current command line options out of the DPDK common
> code and move into a new lib.
> > >> - At this point I was thinking of keeping the rte_eal_init(args,
> argv) API and just have it pass the args/argv to the new lib to create the
> data storage.
> > >> - Maybe move the rte_eal_init() API to the new lib or keep it in
> the common eal code. Do not want to go hog wild.
> > >> - The rte_eal_init(args, argv) would then call to the new API
> rte_eal_initialize(void), which in turn queries the data storage. (still
> thinking here)
> > >These three items seem to be the exact opposite of my suggestion. The
> point of
> > >this change was to segregate the parsing of configuration away from the
> > >initalization dpdk using that configurtion. By keeping rte_eal_init in
> such a
> > >way that the command line is directly passed into it, you've not
> changed that
> > >implicit binding to command line options.
> >
> > Neil,
> >
> > You maybe reading the above wrong or I wrote it wrong, which is a high
> possibility. I want to move the command line parsing out of DPDK an into a
> library, but I still believe I need to provide some backward compatibility
> for ABI and to reduce the learning curve. The current applications can
> still call the rte_eal_init(), which then calls the new lib parser for dpdk
> command line options and then calls rte_eal_initialize() or move to the new
> API rte_eal_initialize() preceded by a new library call to parse the old
> command line args. At some point we can deprecate the rte_eal_init() if we
> think it is reasonable.
> >
> > >
> > >I can understand if you want to keep rte_eal_init as is for ABI
> purposes, but
> > >then you should create an rte_eal_init2(foo), where foo is some handle
> to in
> > >memory parsed configuration, so that applications can preform that
> separation.
> >
> > I think you describe what I had planned here. The rte_eal_initialize()
> routine is the new rte_eal_init2() API and the rte_eal_init() was only for
> backward compatibility was my thinking. I figured the argument to
> rte_eal_initialize() would be something to be decided, but it will mostly
> likely be some type of pointer to the storage.
> >
> > I hope that clears that up, but let me know.
> >
> yes, that clarifies your thinking, and I agree with it. Thank you!
> Neil
>
> > ++Keith
> >
> > >
> > >Neil
> > >
> > >> - The example apps args needs to be passed to the examples as is
> for now, then we can convert them one at a time if needed.
> > >>
> > >> - I would like to keep the storage of the data separate from the file
> parser as they can use the ‘set’ routines to build the data storage up.
> > >> - Keeping them split allows for new parsers to be created, while
> keeping the data storage from changing.
> > >> - The rte_cfg code could be modified to use the new configuration if
> someone wants to take on that task ☺
> > >>
> > >> - Next is the data storage and how we can access the data in a clean
> simple way.
> > >> - I want to have some simple level of hierarchy in the data.
> > >> - Having a string containing at least two levels
> “primary:secondary”.
> > >> - Primary string is something like “EAL” or “Pktgen” or
> “testpmd” to divide the data storage into logical major groups.
> > >> - The primary allows us to have groups and then we can have
> common secondary strings in different groups if needed.
> > >> - Secondary string can be whatever the developer of that group
> would like e.g. simple “EAL:foobar”, two levels “testpmd:foo.bar”
> > >>
> > >> - The secondary string is treated as a single string if it has a
> hierarchy or not, but referencing a single value in the data storage.
> > >> - Key value pairs (KVP) or a hashmap data store.
> > >> - The key here is the whole string “EAL:foobar” not just
> “foobar” secondary string.
> > >> - If we want to have the two split I am ok with that as
> well meaning the API would be:
> > >> rte_map_get(mapObj, “EAL”, “foo.bar”);
> > >> rte_map_set(mapObj, “EAL”, “foo.bar”, value);
> > >> - Have the primary as a different section in the data
> store, would allow for dumping that section maybe easier, not sure.
> > >> - I am leaning toward
> > >> - Not going to try splitting up the string or parse it as it is
> up to the developer to make it unique in the data store.
> > >> - Use a code design to make the strings simple to use without having
> typos be a problem.
> > >> - Not sure what the design is yet, but I do not want to have to
> concat two string or split strings in the code.
> > >>
> > >> This is as far as I have gotten and got tired of typing ☺
> > >>
> > >> I hope this will satisfy most everyone’s needs for now.
> > >>
> > >>
> > >> Regards,
> > >> Keith
> > >>
> > >>
> > >>
> > >
> >
> >
> >
>
Keith
What about the data types of the values?
I would assume that as a library it can provide the service of typed
get/set and not leave conversion and validation to the app.
rte_map_get_int(map,section,key)
rte_map_get_double(...)
rte_map_get_string(...)
rte_map_get_bytes(...,destBuff , destBuffSize) //e.g byte array of RSS key
This may also allow some basic validity of the configuration file
Another point I forgot about is default values.
We sometimes use a notation where the app also specifies a default value in
case the configuration did not specify it
rte_map_get_int(map,section,key , defaultValue )
and specify if this was a mandatory that has no default
rte_map_get_int_crash_if_missing (map,section,key)
/Arnon
next prev parent reply other threads:[~2016-06-03 18:52 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 15:00 Wiles, Keith
2016-06-01 15:46 ` Matthew Hall
2016-06-01 16:08 ` Wiles, Keith
2016-06-01 15:58 ` Jay Rolette
2016-06-01 16:18 ` Bruce Richardson
2016-06-01 16:21 ` Arnon Warshavsky
2016-06-01 18:13 ` Wiles, Keith
2016-06-01 18:31 ` Stephen Hemminger
2016-06-03 10:07 ` Yerden Zhumabekov
2016-06-01 18:51 ` Thomas Monjalon
2016-06-02 9:19 ` Marc
2016-06-02 7:56 ` Yuanhan Liu
2016-06-02 10:41 ` Neil Horman
2016-06-02 13:19 ` Thomas Monjalon
2016-06-02 13:53 ` Wiles, Keith
2016-06-02 17:11 ` Neil Horman
2016-06-02 19:33 ` Wiles, Keith
2016-06-02 19:41 ` Wiles, Keith
2016-06-02 20:08 ` Neil Horman
2016-06-02 20:53 ` Matthew Hall
2016-06-02 22:34 ` Neil Horman
2016-06-03 2:17 ` Matthew Hall
2016-06-03 9:57 ` Bruce Richardson
2016-06-03 10:06 ` Bruce Richardson
2016-06-03 12:03 ` Neil Horman
2016-06-03 10:29 ` Bruce Richardson
2016-06-03 11:01 ` Bruce Richardson
2016-06-03 11:50 ` Neil Horman
2016-06-03 12:01 ` Arnon Warshavsky
2016-06-03 12:53 ` Panu Matilainen
2016-06-03 14:31 ` Arnon Warshavsky
2016-06-03 16:04 ` Wiles, Keith
2016-06-03 16:10 ` Wiles, Keith
2016-06-03 17:44 ` Neil Horman
2016-06-03 18:29 ` Wiles, Keith
2016-06-03 18:38 ` Neil Horman
2016-06-03 18:52 ` Arnon Warshavsky [this message]
2016-06-03 19:00 ` Wiles, Keith
2016-06-03 19:07 ` Wiles, Keith
2016-06-03 19:18 ` Neil Horman
2016-06-03 19:23 ` Wiles, Keith
2016-06-03 19:28 ` Arnon Warshavsky
2016-06-03 21:42 ` Matthew Hall
2016-06-03 21:41 ` Matthew Hall
2016-06-05 0:19 ` Neil Horman
2016-06-03 21:40 ` Matthew Hall
2016-06-03 21:38 ` Matthew Hall
2016-06-03 12:14 ` Panu Matilainen
2016-06-02 20:51 ` Matthew Hall
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