From mboxrd@z Thu Jan 1 00:00:00 1970 From: Panu Matilainen Subject: Re: [PATCH 1/4] vhost: handle VHOST_USER_SET_LOG_BASE request Date: Wed, 2 Dec 2015 15:53:45 +0200 Message-ID: <565EF7E9.6080400@redhat.com> References: <1449027793-30975-1-git-send-email-yuanhan.liu@linux.intel.com> <1449027793-30975-2-git-send-email-yuanhan.liu@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Victor Kaplansky , "Michael S. Tsirkin" To: Yuanhan Liu , dev@dpdk.org Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 7BDA88DB1 for ; Wed, 2 Dec 2015 14:53:47 +0100 (CET) In-Reply-To: <1449027793-30975-2-git-send-email-yuanhan.liu@linux.intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 12/02/2015 05:43 AM, Yuanhan Liu wrote: > VHOST_USER_SET_LOG_BASE request is used to tell the backend (dpdk > vhost-user) where we should log dirty pages, and how big the log > buffer is. > > This request introduces a new payload: > > typedef struct VhostUserLog { > uint64_t mmap_size; > uint64_t mmap_offset; > } VhostUserLog; > > Also, a fd is delivered from QEMU by ancillary data. > > With those info given, an area of memory is mmaped, assigned > to dev->log_base, for logging dirty pages. > > Signed-off-by: Yuanhan Liu > --- > lib/librte_vhost/rte_virtio_net.h | 2 ++ > lib/librte_vhost/vhost_user/vhost-net-user.c | 7 ++++- > lib/librte_vhost/vhost_user/vhost-net-user.h | 6 ++++ > lib/librte_vhost/vhost_user/virtio-net-user.c | 44 +++++++++++++++++++++++++++ > lib/librte_vhost/vhost_user/virtio-net-user.h | 1 + > 5 files changed, 59 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h > index 5687452..416dac2 100644 > --- a/lib/librte_vhost/rte_virtio_net.h > +++ b/lib/librte_vhost/rte_virtio_net.h > @@ -127,6 +127,8 @@ struct virtio_net { > #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ) > char ifname[IF_NAME_SZ]; /**< Name of the tap device or socket path. */ > uint32_t virt_qp_nb; /**< number of queue pair we have allocated */ > + uint64_t log_size; /**< Size of log area */ > + uint8_t *log_base; /**< Where dirty pages are logged */ > void *priv; /**< private context */ > struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; /**< Contains all virtqueue information. */ > } __rte_cache_aligned; This (and other changes in patch 2 breaks the librte_vhost ABI again, so you'd need to at least add a deprecation note to 2.2 to be able to do it in 2.3 at all according to the ABI policy. Perhaps a better option would be adding some padding to the structs now for 2.2 since the vhost ABI is broken there anyway. That would at least give a chance to keep it compatible from 2.2 to 2.3. - Panu -