DPDK patches and discussions
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From: David Marchand <david.marchand@6wind.com>
To: Chao Zhu <bjzhuc@cn.ibm.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 0/7] Patches to split architecture specific operations from DPDK
Date: Fri, 3 Oct 2014 15:21:53 +0200
Message-ID: <CALwxeUtKuc-rN_BmuxEtOWB6E=3EryG45GPgXnRgh4X+Ci_fPw@mail.gmail.com> (raw)
In-Reply-To: <1411724018-7738-1-git-send-email-bjzhuc@cn.ibm.com>

Hello Chao,

On Fri, Sep 26, 2014 at 11:33 AM, Chao Zhu <bjzhuc@cn.ibm.com> wrote:

> The set of patches split x86 architecture specific operations from DPDK
> and put them to the
> arch directories of i686 and x86_64 architecture. This will make the
> adpotion of DPDK much easier
> on other computer architecture. For a new architecture, just add an
> architecture specific
> directory and necessary building configuration files, then DPDK can
> support it.
>
>
Here is a different approach for the headers splitting.

If we are going to support multiple architectures, the best would be to
have a specific header for each arch which implements a common API (no need
for any _arch suffix).
These headers would be located in lib/librte_eal/common/include/arch/$arch/
rather than lib/librte_eal/common/include/$arch/arch/ (which looks odd to
me).
Makefiles can add some -I for dpdk to build itself (and we can remove those
symlinks from the makefiles).
Makefiles only install the specific headers in RTE_SDK/include for use by
applications.

For common code and documentation, we can add a "generic" directory in
lib/librte_eal/common/include (or "arch-generic", or "shared" ... any
better idea ?).
DPDK makefiles installs the generic headers in RTE_SDK/include/generic.
arch headers (like rte_atomic.h) include the generic one
(<generic/rte_atomic.h>).

These generic headers can be implemented using compiler intrinsics when
possible.
They also include the doxygen stuff in a single place.


This would look like something like this, for rte_atomic.h :
- in DPDK sources
$ ls lib/librte_eal/common/include/*/rte_atomic.h
lib/librte_eal/common/include/i686/rte_atomic.h
lib/librte_eal/common/include/x86_64/rte_atomic.h
lib/librte_eal/common/include/generic/rte_atomic.h

- in installed RTE_SDK
$ ls RTE_SDK/include/{,*/}rte_atomic.h
RTE_SDK/include/rte_atomic.h
RTE_SDK/include/generic/rte_atomic.h

Comments ?


I am only focusing on the first patchset at the moment, but if we can find
consensus here, a respin of the two patchsets would be great.

Thanks.

-- 
David Marchand

  parent reply	other threads:[~2014-10-03 13:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-26  9:33 Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 1/7] Split atomic operations to architecture specific Chao Zhu
2014-09-29 11:05   ` Bruce Richardson
2014-09-29 15:24     ` Neil Horman
2014-09-30  2:18       ` Chao CH Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 2/7] Split byte order " Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 3/7] Split CPU cycle operation " Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 4/7] Split prefetch operations " Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 5/7] Split spinlock " Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 6/7] Split memcpy operation " Chao Zhu
2014-09-26  9:33 ` [dpdk-dev] [PATCH 7/7] Split CPU flags operations " Chao Zhu
2014-10-03 13:21 ` David Marchand [this message]
2014-10-03 13:29   ` [dpdk-dev] [PATCH 0/7] Patches to split architecture specific operations from DPDK Bruce Richardson
2014-10-13  2:36   ` Chao CH Zhu
2014-10-06 21:46 ` Cyril Chemparathy
2014-10-12  9:14   ` Chao CH Zhu

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