DPDK patches and discussions
 help / color / mirror / Atom feed
From: Bruce Richardson <bruce.richardson@intel.com>
To: "Jiang, Cheng1" <cheng1.jiang@intel.com>
Cc: David Marchand <david.marchand@redhat.com>,
	Maxime Coquelin <maxime.coquelin@redhat.com>,
	"Xia, Chenbo" <chenbo.xia@intel.com>, dev <dev@dpdk.org>,
	"Fu, Patrick" <patrick.fu@intel.com>,
	"Yang, YvonneX" <yvonnex.yang@intel.com>,
	"Hu, Jiayu" <jiayu.hu@intel.com>
Subject: Re: [dpdk-dev] [PATCH v3] examples/vhost: fix ioat dependency issue
Date: Thu, 12 Nov 2020 12:02:04 +0000
Message-ID: <20201112120204.GH1309@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <CO1PR11MB4995CA13A14B469E442A7367DCE70@CO1PR11MB4995.namprd11.prod.outlook.com>

On Thu, Nov 12, 2020 at 11:29:56AM +0000, Jiang, Cheng1 wrote:
> Hi Bruce,
> 
> > -----Original Message-----
> > From: Bruce Richardson <bruce.richardson@intel.com>
> > Sent: Thursday, November 12, 2020 6:28 PM
> > To: David Marchand <david.marchand@redhat.com>
> > Cc: Jiang, Cheng1 <cheng1.jiang@intel.com>; Maxime Coquelin
> > <maxime.coquelin@redhat.com>; Xia, Chenbo <chenbo.xia@intel.com>;
> > dev <dev@dpdk.org>; Fu, Patrick <patrick.fu@intel.com>; Yang, YvonneX
> > <yvonnex.yang@intel.com>; Hu, Jiayu <jiayu.hu@intel.com>
> > Subject: Re: [dpdk-dev] [PATCH v3] examples/vhost: fix ioat dependency
> > issue
> >
> > On Thu, Nov 12, 2020 at 10:36:50AM +0100, David Marchand wrote:
> > > On Thu, Nov 12, 2020 at 8:30 AM Cheng Jiang <Cheng1.jiang@intel.com>
> > wrote:
> > > >
> > > > Fix vhost-switch compiling issue when ioat dependency is missing.
> > > > Change 'RTE_x86' check into 'RTE_RAW_IOAT' check in meson build file
> > > > and update Makefile. Clean some codes.
> > > >
> > > > Fixes: abec60e7115d ("examples/vhost: support vhost async data
> > > > path")
> > > > Fixes: 3a04ecb21420 ("examples/vhost: add async vhost args parsing")
> > > >
> > > > Signed-off-by: Cheng Jiang <Cheng1.jiang@intel.com>
> > > > ---
> > > > v3:
> > > >  * Added fixes lines in commit log.
> > > >
> > > > v2:
> > > >  * Cleaned some codes
> > > >  * Changed RTE_RAW_IOAT check method in Makefile
> > > >  * Added ioat function definition when RTE_RAW_IOAT is missing
> > > >
> > > >  examples/vhost/Makefile    |  5 +++++
> > > >  examples/vhost/ioat.h      | 32 +++++++++++++++++++++++++-------
> > > >  examples/vhost/main.c      | 22 +++++++++++-----------
> > > >  examples/vhost/meson.build |  2 +-
> > > >  4 files changed, 42 insertions(+), 19 deletions(-)
> > > >
> > > > diff --git a/examples/vhost/Makefile b/examples/vhost/Makefile index
> > > > cec59d0e0..cbe56f742 100644
> > > > --- a/examples/vhost/Makefile
> > > > +++ b/examples/vhost/Makefile
> > > > @@ -28,6 +28,11 @@ CFLAGS += -O3 $(shell $(PKGCONF) --cflags
> > > > libdpdk)  LDFLAGS_SHARED = $(shell $(PKGCONF) --libs libdpdk)
> > > > LDFLAGS_STATIC = $(shell $(PKGCONF) --static --libs libdpdk)
> > > >
> > > > +HAS_RAW_IOAT=$(shell echo RTE_RAW_IOAT | $(CPP) $(CFLAGS) -P - |
> > > > +tail -1) ifeq ($(HAS_RAW_IOAT), 1) SRCS-y += ioat.c endif
> > > > +
> > > >  CFLAGS += -DALLOW_EXPERIMENTAL_API
> > > >
> > > >  build/$(APP)-shared: $(SRCS-y) Makefile $(PC_FILE) | build
> >
> > <snip>
> >
> > > I'll let Bruce and Maxime have the last word on this patch.
> > > But at least it works for me,
> > > Tested-by: David Marchand <david.marchand@redhat.com>
> > >
> > I don't have a really strong objection to this, but I still would rather see the
> > ioat detection done in the C code only rather than in the Makefile.
> > I'm concerned about us adding too much complexity into our makefiles, so
> > would like to keep them simple as much as possible.
> >
> > Therefore, I'd like to see ioat.c always included in SRCS-y, and ioat.c just have
> > #ifdef RTE_RAW_IOAT to block out any ioat-dependent code.
> >
> > /Bruce
> 
> Tomorrow is the deadline for RC4, it's a little bit rush to prepare a new framework to cover the conditional compiling. Considering we have test efforts and CI check already on-going based on current patch, I would prefer to keep current code structure. Plus, pure C code change could also introduce more readability problem when we have more than one async callback implementations.
>

I don't see any readability problems at all, in fact the result is cleaner
and shorter IMHO - especially the Makefile. I just tested with the
following changes applied on top of your patch, and all seemed to build ok.

Do you see any implementation problems with the below solution?

/Bruce

diff --git a/examples/vhost/Makefile b/examples/vhost/Makefile
index cbe56f742..8c969caaa 100644
--- a/examples/vhost/Makefile
+++ b/examples/vhost/Makefile
@@ -5,7 +5,7 @@
 APP = vhost-switch

 # all source are stored in SRCS-y
-SRCS-y := main.c virtio_net.c
+SRCS-y := main.c virtio_net.c ioat.c

 # Build using pkg-config variables if possible
 ifneq ($(shell pkg-config --exists libdpdk && echo 0),0)
@@ -28,11 +28,6 @@ CFLAGS += -O3 $(shell $(PKGCONF) --cflags libdpdk)
 LDFLAGS_SHARED = $(shell $(PKGCONF) --libs libdpdk)
 LDFLAGS_STATIC = $(shell $(PKGCONF) --static --libs libdpdk)

-HAS_RAW_IOAT=$(shell echo RTE_RAW_IOAT | $(CPP) $(CFLAGS) -P - | tail -1)
-ifeq ($(HAS_RAW_IOAT), 1)
-SRCS-y += ioat.c
-endif
-
 CFLAGS += -DALLOW_EXPERIMENTAL_API

 build/$(APP)-shared: $(SRCS-y) Makefile $(PC_FILE) | build
diff --git a/examples/vhost/ioat.c b/examples/vhost/ioat.c
index b2c74f653..7c1a4f40d 100644
--- a/examples/vhost/ioat.c
+++ b/examples/vhost/ioat.c
@@ -8,6 +8,8 @@
 #include "ioat.h"
 #include "main.h"

+#ifdef RTE_RAW_IOAT
+
 struct dma_for_vhost dma_bind[MAX_VHOST_DEVICE];

 struct packet_tracker {
@@ -199,3 +201,5 @@ ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
        /* Opaque data is not supported */
        return -1;
 }
+
+#endif /* RTE_RAW_IOAT */


  reply	other threads:[~2020-11-12 12:02 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-11 11:19 [dpdk-dev] [PATCH v1] " Cheng Jiang
2020-11-11 14:36 ` David Marchand
2020-11-11 15:03   ` Bruce Richardson
2020-11-12  7:14   ` Jiang, Cheng1
2020-11-12  9:31     ` Bruce Richardson
2020-11-12  9:39       ` David Marchand
2020-11-12 10:22         ` Bruce Richardson
2020-11-12  5:16 ` [dpdk-dev] [PATCH v2] " Cheng Jiang
2020-11-12  7:21 ` [dpdk-dev] [PATCH v3] " Cheng Jiang
2020-11-12  9:36   ` David Marchand
2020-11-12 10:28     ` Bruce Richardson
2020-11-12 11:29       ` Jiang, Cheng1
2020-11-12 12:02         ` Bruce Richardson [this message]
2020-11-12 14:06           ` Jiang, Cheng1
2020-11-12 13:47 ` [dpdk-dev] [PATCH v4] " Cheng Jiang
2020-11-12 15:01   ` Bruce Richardson
2020-11-12 15:55     ` Jiang, Cheng1
2020-11-12 15:49 ` [dpdk-dev] [PATCH v5] " Cheng Jiang
2020-11-12 16:01   ` Bruce Richardson
2020-11-12 16:51   ` Maxime Coquelin
2020-11-12 18:18   ` David Marchand
2020-11-13  8:40   ` Maxime Coquelin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201112120204.GH1309@bricha3-MOBL.ger.corp.intel.com \
    --to=bruce.richardson@intel.com \
    --cc=chenbo.xia@intel.com \
    --cc=cheng1.jiang@intel.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=jiayu.hu@intel.com \
    --cc=maxime.coquelin@redhat.com \
    --cc=patrick.fu@intel.com \
    --cc=yvonnex.yang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git