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 319ED1BE8A for ; Sat, 30 Jun 2018 18:05:09 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Jun 2018 09:05:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,291,1526367600"; d="scan'208";a="67643519" Received: from dpdk-test32.sh.intel.com ([10.67.119.193]) by fmsmga004.fm.intel.com with ESMTP; 30 Jun 2018 09:05:07 -0700 From: Marvin Liu To: maxime.coquelin@redhat.com, tiwei.bie@intel.com Cc: zhihong.wang@intel.com, dev@dpdk.org, Marvin Liu Date: Sun, 1 Jul 2018 07:50:41 +0800 Message-Id: <20180630235049.62610-2-yong.liu@intel.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180630235049.62610-1-yong.liu@intel.com> References: <20180630235049.62610-1-yong.liu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH v4 1/9] vhost: advertise support in-order feature X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 30 Jun 2018 16:05:09 -0000 If devices always use descriptors in the same order in which they have been made available. These devices can offer the VIRTIO_F_IN_ORDER feature. If negotiated, this knowledge allows devices to notify the use of a batch of buffers to virtio driver by only writing used ring index. Vhost user device has supported this feature by default. If vhost dequeue zero is enabled, should disable VIRTIO_F_IN_ORDER as vhost can’t assure that descriptors returned from NIC are in order. Signed-off-by: Marvin Liu Reviewed-by: Maxime Coquelin diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c index 0399c37bc..d63031747 100644 --- a/lib/librte_vhost/socket.c +++ b/lib/librte_vhost/socket.c @@ -853,6 +853,12 @@ rte_vhost_driver_register(const char *path, uint64_t flags) vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES; vsocket->features = VIRTIO_NET_SUPPORTED_FEATURES; + /* Dequeue zero copy can't assure descriptors returned in order */ + if (vsocket->dequeue_zero_copy) { + vsocket->supported_features &= ~(1ULL << VIRTIO_F_IN_ORDER); + vsocket->features &= ~(1ULL << VIRTIO_F_IN_ORDER); + } + if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) { vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM); vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM); diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index 786a74f64..3437b996b 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -191,6 +191,13 @@ struct vhost_msg { #define VIRTIO_F_VERSION_1 32 #endif +/* + * Available and used descs are in same order + */ +#ifndef VIRTIO_F_IN_ORDER +#define VIRTIO_F_IN_ORDER 35 +#endif + /* Features supported by this builtin vhost-user net driver. */ #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \ (1ULL << VIRTIO_F_ANY_LAYOUT) | \ @@ -214,7 +221,8 @@ struct vhost_msg { (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \ (1ULL << VIRTIO_RING_F_EVENT_IDX) | \ - (1ULL << VIRTIO_NET_F_MTU) | \ + (1ULL << VIRTIO_NET_F_MTU) | \ + (1ULL << VIRTIO_F_IN_ORDER) | \ (1ULL << VIRTIO_F_IOMMU_PLATFORM)) -- 2.17.0