From patchwork Tue Apr 3 12:20:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yang, Zhiyong" X-Patchwork-Id: 36940 X-Patchwork-Delegate: maxime.coquelin@redhat.com Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 39AC71B6DA; Tue, 3 Apr 2018 14:20:19 +0200 (CEST) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 9BD6A1B6B6 for ; Tue, 3 Apr 2018 14:20:15 +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 orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Apr 2018 05:20:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,400,1517904000"; d="scan'208";a="43004825" Received: from dpdk9.bj.intel.com ([172.16.182.183]) by fmsmga004.fm.intel.com with ESMTP; 03 Apr 2018 05:20:12 -0700 From: zhiyong.yang@intel.com To: dev@dpdk.org Cc: maxime.coquelin@redhat.com, jianfeng.tan@intel.com, thomas@monjalon.net, zhihong.wang@intel.com, tiwei.bie@intel.com, Zhiyong Yang Date: Tue, 3 Apr 2018 20:20:09 +0800 Message-Id: <20180403122009.52876-2-zhiyong.yang@intel.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180403122009.52876-1-zhiyong.yang@intel.com> References: <20180321030343.64399-1-zhiyong.yang@intel.com> <20180403122009.52876-1-zhiyong.yang@intel.com> Subject: [dpdk-dev] [PATCH v4 1/1] net/virtio-user: add support for server mode 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" virtio-user adds support for server mode in this patch. Client mode vhost-user startup firstly, server mode virtio-user startups and creates the socket file to exchange vhost messages. If the connection is broken, client mode vhost-user can support to reconnect virtio-user. Server mode virtio-user supports many times' vhost-user reconnections with the same parameter configurations. Release note is updated in the patch. Signed-off-by: Zhiyong Yang --- doc/guides/rel_notes/release_18_05.rst | 6 ++ drivers/net/virtio/virtio_user/vhost_user.c | 64 ++++++++++++-- drivers/net/virtio/virtio_user/virtio_user_dev.c | 45 +++++++--- drivers/net/virtio/virtio_user/virtio_user_dev.h | 4 + drivers/net/virtio/virtio_user_ethdev.c | 103 +++++++++++++++++++++-- 5 files changed, 194 insertions(+), 28 deletions(-) diff --git a/doc/guides/rel_notes/release_18_05.rst b/doc/guides/rel_notes/release_18_05.rst index 9cc77f893..f8897b2e9 100644 --- a/doc/guides/rel_notes/release_18_05.rst +++ b/doc/guides/rel_notes/release_18_05.rst @@ -58,6 +58,12 @@ New Features * Added support for NVGRE, VXLAN and GENEVE filters in flow API. * Added support for DROP action in flow API. +* **Added support for virtio-user server mode.** + In a container environment if the vhost-user backend restarts, there's no way + for it to reconnect to virtio-user. To address this, support for server mode + is added. In this mode the socket file is created by virtio-user, which the + backend connects to. This means that if the backend restarts, it can reconnect + to virtio-user and continue communications. API Changes ----------- diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c index 91c6449bb..1b3401d4f 100644 --- a/drivers/net/virtio/virtio_user/vhost_user.c +++ b/drivers/net/virtio/virtio_user/vhost_user.c @@ -378,6 +378,50 @@ vhost_user_sock(struct virtio_user_dev *dev, return 0; } +static void +virtio_user_set_block(int fd, bool enabled) +{ + int f; + + f = fcntl(fd, F_GETFL); + if (enabled) + fcntl(fd, F_SETFL, f & ~O_NONBLOCK); + else + fcntl(fd, F_SETFL, f | O_NONBLOCK); +} + +#define MAX_VIRTIO_USER_BACKLOG 128 +static int +virtio_user_start_server(struct virtio_user_dev *dev, struct sockaddr_un *un) +{ + int ret; + int fd = dev->listenfd; + int connectfd; + + ret = bind(fd, (struct sockaddr *)un, sizeof(*un)); + if (ret < 0) { + PMD_DRV_LOG(ERR, "failed to bind to %s: %s; remove it and try again\n", + dev->path, strerror(errno)); + goto err; + } + ret = listen(fd, MAX_VIRTIO_USER_BACKLOG); + if (ret < 0) + goto err; + + connectfd = accept(fd, NULL, NULL); + if (connectfd >= 0) + dev->connected = true; + else + goto err; + + dev->vhostfd = connectfd; + virtio_user_set_block(connectfd, true); + return 0; +err: + close(dev->listenfd); + return -1; +} + /** * Set up environment to talk with a vhost user backend. * @@ -390,6 +434,7 @@ vhost_user_setup(struct virtio_user_dev *dev) { int fd; int flag; + int ret = 0; struct sockaddr_un un; fd = socket(AF_UNIX, SOCK_STREAM, 0); @@ -405,14 +450,21 @@ vhost_user_setup(struct virtio_user_dev *dev) memset(&un, 0, sizeof(un)); un.sun_family = AF_UNIX; snprintf(un.sun_path, sizeof(un.sun_path), "%s", dev->path); - if (connect(fd, (struct sockaddr *)&un, sizeof(un)) < 0) { - PMD_DRV_LOG(ERR, "connect error, %s", strerror(errno)); - close(fd); - return -1; + + if (dev->is_server) { + dev->listenfd = fd; + ret = virtio_user_start_server(dev, &un); + } else { + dev->vhostfd = fd; + if (connect(fd, (struct sockaddr *)&un, sizeof(un)) < 0) { + PMD_DRV_LOG(ERR, "connect error, %s", strerror(errno)); + close(fd); + return -1; + } + dev->connected = true; } - dev->vhostfd = fd; - return 0; + return ret; } static int diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c index f90fee9e5..dd9fa9bdf 100644 --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c @@ -142,6 +142,9 @@ int virtio_user_stop_device(struct virtio_user_dev *dev) { uint32_t i; + if (!dev->connected) + return -1; + for (i = 0; i < dev->max_queue_pairs; ++i) dev->ops->enable_qp(dev, i, 0); @@ -267,21 +270,27 @@ virtio_user_dev_setup(struct virtio_user_dev *dev) dev->vhostfds = NULL; dev->tapfds = NULL; - if (is_vhost_user_by_type(dev->path)) { - dev->ops = &ops_user; + if (dev->is_server) { + dev->ops = &ops_user;/* server mode only supports vhost user*/ } else { - dev->ops = &ops_kernel; - - dev->vhostfds = malloc(dev->max_queue_pairs * sizeof(int)); - dev->tapfds = malloc(dev->max_queue_pairs * sizeof(int)); - if (!dev->vhostfds || !dev->tapfds) { - PMD_INIT_LOG(ERR, "Failed to malloc"); - return -1; - } - - for (q = 0; q < dev->max_queue_pairs; ++q) { - dev->vhostfds[q] = -1; - dev->tapfds[q] = -1; + if (is_vhost_user_by_type(dev->path)) { + dev->ops = &ops_user; + } else { + dev->ops = &ops_kernel; + + dev->vhostfds = malloc(dev->max_queue_pairs * + sizeof(int)); + dev->tapfds = malloc(dev->max_queue_pairs * + sizeof(int)); + if (!dev->vhostfds || !dev->tapfds) { + PMD_INIT_LOG(ERR, "Failed to malloc"); + return -1; + } + + for (q = 0; q < dev->max_queue_pairs; ++q) { + dev->vhostfds[q] = -1; + dev->tapfds[q] = -1; + } } } @@ -388,6 +397,11 @@ virtio_user_dev_uninit(struct virtio_user_dev *dev) close(dev->vhostfd); + if (dev->is_server && dev->listenfd >= 0) { + close(dev->listenfd); + dev->listenfd = -1; + } + dev->connected = false; if (dev->vhostfds) { for (i = 0; i < dev->max_queue_pairs; ++i) close(dev->vhostfds[i]); @@ -396,6 +410,9 @@ virtio_user_dev_uninit(struct virtio_user_dev *dev) } free(dev->ifname); + + if (dev->is_server) + unlink(dev->path); } static uint8_t diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h b/drivers/net/virtio/virtio_user/virtio_user_dev.h index 64467b4f9..68056720d 100644 --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h @@ -6,6 +6,7 @@ #define _VIRTIO_USER_DEV_H #include +#include #include "../virtio_pci.h" #include "../virtio_ring.h" #include "vhost.h" @@ -13,6 +14,9 @@ struct virtio_user_dev { /* for vhost_user backend */ int vhostfd; + int listenfd; /* listening fd */ + bool connected; /* connection status */ + bool is_server; /* server or client mode */ /* for vhost_kernel backend */ char *ifname; diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c index 263649006..5b8c8e291 100644 --- a/drivers/net/virtio/virtio_user_ethdev.c +++ b/drivers/net/virtio/virtio_user_ethdev.c @@ -24,15 +24,76 @@ #define virtio_user_get_dev(hw) \ ((struct virtio_user_dev *)(hw)->virtio_user_dev) +static void +virtio_user_server_reconnection(struct virtio_user_dev *dev) +{ + int ret; + int flag; + int connectfd; + struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id]; + + if (dev->connected) + return; + + connectfd = accept(dev->listenfd, NULL, NULL); + if (connectfd < 0) + return; + + dev->vhostfd = connectfd; + flag = fcntl(connectfd, F_GETFD); + fcntl(connectfd, F_SETFL, flag & ~O_NONBLOCK); + + ret = virtio_user_start_device(dev); + if (ret < 0) + return; + + if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) { + if (rte_intr_disable(eth_dev->intr_handle) < 0) { + PMD_DRV_LOG(ERR, "interrupt disable failed"); + return; + } + rte_intr_callback_unregister(eth_dev->intr_handle, + virtio_interrupt_handler, + eth_dev); + eth_dev->intr_handle->fd = connectfd; + rte_intr_callback_register(eth_dev->intr_handle, + virtio_interrupt_handler, eth_dev); + + if (rte_intr_enable(eth_dev->intr_handle) < 0) { + PMD_DRV_LOG(ERR, "interrupt enable failed"); + return; + } + } + dev->connected = true; + PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!"); +} + static void virtio_user_delayed_handler(void *param) { struct virtio_hw *hw = (struct virtio_hw *)param; - struct rte_eth_dev *dev = &rte_eth_devices[hw->port_id]; + struct rte_eth_dev *eth_dev = &rte_eth_devices[hw->port_id]; + struct virtio_user_dev *dev = virtio_user_get_dev(hw); - rte_intr_callback_unregister(dev->intr_handle, - virtio_interrupt_handler, - dev); + if (rte_intr_disable(eth_dev->intr_handle) < 0) { + PMD_DRV_LOG(ERR, "interrupt disable failed"); + return; + } + rte_intr_callback_unregister(eth_dev->intr_handle, + virtio_interrupt_handler, eth_dev); + if (dev->is_server) { + if (dev->vhostfd >= 0) { + close(dev->vhostfd); + dev->vhostfd = -1; + } + eth_dev->intr_handle->fd = dev->listenfd; + rte_intr_callback_register(eth_dev->intr_handle, + virtio_interrupt_handler, eth_dev); + if (rte_intr_enable(eth_dev->intr_handle) < 0) { + PMD_DRV_LOG(ERR, "interrupt enable failed"); + return; + } + } } static void @@ -65,8 +126,7 @@ virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset, r = recv(dev->vhostfd, buf, 128, MSG_PEEK); if (r == 0 || (r < 0 && errno != EAGAIN)) { dev->status &= (~VIRTIO_NET_S_LINK_UP); - PMD_DRV_LOG(ERR, "virtio-user port %u is down", - hw->port_id); + /* Only client mode is available now. Once the * connection is broken, it can never be up * again. Besides, this function could be called @@ -74,9 +134,14 @@ virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset, * callback cannot be unregistered here, set an * alarm to do it. */ - rte_eal_alarm_set(1, + if (dev->connected) { + dev->connected = false; + PMD_DRV_LOG(ERR, "virtio-user port %u is down", + hw->port_id); + rte_eal_alarm_set(1, virtio_user_delayed_handler, (void *)hw); + } } else { dev->status |= VIRTIO_NET_S_LINK_UP; } @@ -85,7 +150,10 @@ virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset, PMD_DRV_LOG(ERR, "error clearing O_NONBLOCK flag"); return; } - } + + } else if (dev->is_server) + virtio_user_server_reconnection(dev); + *(uint16_t *)dst = dev->status; } @@ -278,12 +346,15 @@ static const char *valid_args[] = { VIRTIO_USER_ARG_QUEUE_SIZE, #define VIRTIO_USER_ARG_INTERFACE_NAME "iface" VIRTIO_USER_ARG_INTERFACE_NAME, +#define VIRTIO_USER_ARG_SERVER_MODE "server" + VIRTIO_USER_ARG_SERVER_MODE, NULL }; #define VIRTIO_USER_DEF_CQ_EN 0 #define VIRTIO_USER_DEF_Q_NUM 1 #define VIRTIO_USER_DEF_Q_SZ 256 +#define VIRTIO_USER_DEF_SERVER_MODE 0 static int get_string_arg(const char *key __rte_unused, @@ -378,10 +449,12 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev) uint64_t queues = VIRTIO_USER_DEF_Q_NUM; uint64_t cq = VIRTIO_USER_DEF_CQ_EN; uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ; + uint64_t server_mode = VIRTIO_USER_DEF_SERVER_MODE; char *path = NULL; char *ifname = NULL; char *mac_addr = NULL; int ret = -1; + struct virtio_user_dev *vu_dev = NULL; kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_args); if (!kvlist) { @@ -445,6 +518,15 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev) } } + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_SERVER_MODE) == 1) { + if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_SERVER_MODE, + &get_integer_arg, &server_mode) < 0) { + PMD_INIT_LOG(ERR, "error to parse %s", + VIRTIO_USER_ARG_SERVER_MODE); + goto end; + } + } + if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) { if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM, &get_integer_arg, &cq) < 0) { @@ -476,6 +558,11 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev) } hw = eth_dev->data->dev_private; + vu_dev = virtio_user_get_dev(hw); + if (server_mode == 1) + vu_dev->is_server = true; + else + vu_dev->is_server = false; if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq, queue_size, mac_addr, &ifname) < 0) { PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");