From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id D76D1A2EDB for ; Fri, 6 Sep 2019 19:23:06 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 347AA1F3F5; Fri, 6 Sep 2019 19:23:06 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id F2EB51F3F3 for ; Fri, 6 Sep 2019 19:23:03 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4FED31DA0; Fri, 6 Sep 2019 17:23:03 +0000 (UTC) Received: from [10.36.112.25] (ovpn-112-25.ams2.redhat.com [10.36.112.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CEA495D9CA; Fri, 6 Sep 2019 17:23:00 +0000 (UTC) To: JinYu , dev@dpdk.org Cc: changpeng.liu@intel.com, tiwei.bie@intel.com, zhihong.wang@intel.com, Lin Li , Xun Ni , Yu Zhang References: <20190806182500.22320> <20190829141224.49700-1-jin.yu@intel.com> <20190829141224.49700-5-jin.yu@intel.com> From: Maxime Coquelin Openpgp: preference=signencrypt Autocrypt: addr=maxime.coquelin@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190829141224.49700-5-jin.yu@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.71]); Fri, 06 Sep 2019 17:23:03 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH v6 04/10] vhost: add two new messages to support a shared buffer 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: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 8/29/19 4:12 PM, JinYu wrote: > This patch introduces two new messages VHOST_USER_GET_INFLIGHT_FD > and VHOST_USER_SET_INFLIGHT_FD to support transferring a shared > buffer between qemu and backend. > > Signed-off-by: Lin Li > Signed-off-by: Xun Ni > Signed-off-by: Yu Zhang > Signed-off-by: Jin Yu > --- > lib/librte_vhost/vhost.h | 7 + > lib/librte_vhost/vhost_user.c | 242 ++++++++++++++++++++++++++++++++++ > lib/librte_vhost/vhost_user.h | 4 +- > 3 files changed, 252 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h > index 884befa85..39f645b97 100644 > --- a/lib/librte_vhost/vhost.h > +++ b/lib/librte_vhost/vhost.h > @@ -286,6 +286,12 @@ struct guest_page { > uint64_t size; > }; > > +struct inflight_mem_info { > + int fd; > + void *addr; > + uint64_t size; > +}; > + > /** > * Device structure contains all configuration information relating > * to the device. > @@ -303,6 +309,7 @@ struct virtio_net { > uint32_t nr_vring; > int dequeue_zero_copy; > struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; > + struct inflight_mem_info inflight_info; Could it be a pointer and allocated only if the feature has been negotiated? > #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ) > char ifname[IF_NAME_SZ]; > uint64_t log_size; > diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c > index c9e29ece8..647929234 100644 > --- a/lib/librte_vhost/vhost_user.c > +++ b/lib/librte_vhost/vhost_user.c > @@ -49,6 +49,15 @@ > #define VIRTIO_MIN_MTU 68 > #define VIRTIO_MAX_MTU 65535 > > +#define INFLIGHT_ALIGNMENT 64 > +#define INFLIGHT_VERSION 0xabcd > +#define VIRTQUEUE_MAX_SIZE 1024 > + > +#define CLOEXEC 0x0001U > + > +#define ALIGN_DOWN(n, m) ((n) / (m) * (m)) > +#define ALIGN_UP(n, m) ALIGN_DOWN((n) + (m) - 1, (m)) > + > static const char *vhost_message_str[VHOST_USER_MAX] = { > [VHOST_USER_NONE] = "VHOST_USER_NONE", > [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES", > @@ -78,6 +87,8 @@ static const char *vhost_message_str[VHOST_USER_MAX] = { > [VHOST_USER_POSTCOPY_ADVISE] = "VHOST_USER_POSTCOPY_ADVISE", > [VHOST_USER_POSTCOPY_LISTEN] = "VHOST_USER_POSTCOPY_LISTEN", > [VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END", > + [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD", > + [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD", > }; > > static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg); > @@ -160,6 +171,16 @@ vhost_backend_cleanup(struct virtio_net *dev) > dev->log_addr = 0; > } > > + if (dev->inflight_info.addr) { > + munmap(dev->inflight_info.addr, dev->inflight_info.size); > + dev->inflight_info.addr = NULL; > + } > + > + if (dev->inflight_info.fd > 0) { > + close(dev->inflight_info.fd); > + dev->inflight_info.fd = -1; > + } > + > if (dev->slave_req_fd >= 0) { > close(dev->slave_req_fd); > dev->slave_req_fd = -1; > @@ -1165,6 +1186,225 @@ virtio_is_ready(struct virtio_net *dev) > return 1; > } > > +static int > +mem_create(const char *name, unsigned int flags) > +{ > +#ifdef __NR_memfd_create > + return syscall(__NR_memfd_create, name, flags); > +#else > + return -1; > +#endif > +} Maybe you could use memfd_create, as done in: lib/librte_eal/linux/eal/eal_memalloc.c