From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 8B2211B1FE; Thu, 22 Nov 2018 20:20:04 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Nov 2018 11:20:03 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,266,1539673200"; d="scan'208";a="282197792" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.79]) ([10.237.221.79]) by fmsmga005.fm.intel.com with ESMTP; 22 Nov 2018 11:20:01 -0800 To: Maxime Coquelin , dev@dpdk.org, thomas@monjalon.net, tiwei.bie@intel.com, zhihong.wang@intel.com, jfreiman@redhat.com Cc: stable@dpdk.org References: <20181122170922.15007-1-maxime.coquelin@redhat.com> <5437708e-d8cf-fe17-6fd6-fad67b3a0eb7@redhat.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <5437708e-d8cf-fe17-6fd6-fad67b3a0eb7@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] vhost: fix packed ring defines declaration X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 19:20:05 -0000 On 11/22/2018 6:51 PM, Maxime Coquelin wrote: > > > On 11/22/18 7:23 PM, Ferruh Yigit wrote: >> On 11/22/2018 5:09 PM, Maxime Coquelin wrote: >>> The packed ring defines were declared only if kernel >>> header does not declare them. >>> The problem is that they are not applied in upstream kernel, >>> and some changes in the names have been required. >>> >>> This patch declares the defines unconditionally, which >>> fixes potential build issues. >> >> +1 to address possible build issues. >> >>> >>> Fixes: 297b1e7350f6 ("vhost: add virtio packed virtqueue defines") >>> Cc: stable@dpdk.org >>> >>> Signed-off-by: Maxime Coquelin >>> --- >>> lib/librte_vhost/vhost.h | 22 +++++++++++----------- >>> 1 file changed, 11 insertions(+), 11 deletions(-) >>> >>> diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h >>> index 760f42192..5218f1b12 100644 >>> --- a/lib/librte_vhost/vhost.h >>> +++ b/lib/librte_vhost/vhost.h >>> @@ -219,13 +219,6 @@ struct vhost_msg { >>> >>> #define VIRTIO_F_RING_PACKED 34 >>> >>> -#define VRING_DESC_F_NEXT 1 >>> -#define VRING_DESC_F_WRITE 2 >>> -#define VRING_DESC_F_INDIRECT 4 >> >> Why these are not re-defined below? Not used? > > These defines are in kernel headers since the beginning of virtio > support, so there are no reasons to keep them (and they aren't packed- > ring specific). > > I can let them if you prefer, it does not hurt but shouldn't be here. Not required, I just want to confirm nothing missed. > >>> - >>> -#define VRING_DESC_F_AVAIL (1ULL << 7) >>> -#define VRING_DESC_F_USED (1ULL << 15) >>> - >>> struct vring_packed_desc { >>> uint64_t addr; >>> uint32_t len; >>> @@ -233,16 +226,23 @@ struct vring_packed_desc { >>> uint16_t flags; >>> }; >>> >>> -#define VRING_EVENT_F_ENABLE 0x0 >>> -#define VRING_EVENT_F_DISABLE 0x1 >>> -#define VRING_EVENT_F_DESC 0x2 >>> - >>> struct vring_packed_desc_event { >>> uint16_t off_wrap; >>> uint16_t flags; >>> }; >>> #endif >>> >>> +/* >>> + * Declare below packed ring defines unconditionally >>> + * as Kernel header might use different names. >>> + */ >>> +#define VRING_DESC_F_AVAIL (1ULL << 7) >>> +#define VRING_DESC_F_USED (1ULL << 15) >>> + >>> +#define VRING_EVENT_F_ENABLE 0x0 >>> +#define VRING_EVENT_F_DISABLE 0x1 >>> +#define VRING_EVENT_F_DESC 0x2 >> >> What if Linux changes mind and uses old names again, build will fail again. If >> related part in Linux is not released yet, what do you think being on safe side >> and adding these defines with "#ifndef" wrap? > > There are the "old" ones. > In any case it will work (I tested it). I see they are the old ones but is there any chance that kernel uses them again (for some odd reason) ? Which can break the build. Should we add a protection? > > In a future release, I plan to get rid of this dependency with Kernel > which only causes problems. > > There was a benefit at the beginning when all needed declarations where > in the Kernel headers. But now, every time we add a new virtio feature, > we have to check kernel supports it and if not define it. > > Thanks, > Maxime >>> + >>> /* >>> * Available and used descs are in same order >>> */ >>> >>