From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from EUR03-AM5-obe.outbound.protection.outlook.com (mail-eopbgr30050.outbound.protection.outlook.com [40.107.3.50]) by dpdk.org (Postfix) with ESMTP id DE1B51B106 for ; Wed, 17 Oct 2018 10:56:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=RKpm7T1DyGTxgxvNEDVsb7YFwG1twZJwi9pUzr8PKuI=; b=X87aLAIrOveOYJCElov68NTnLMwP3DnM+PJbbJzrBeD5/5h5uWu3gLOuKHicUWej1DYtGdf9n/ED5oF0ItBq2R1E9Jp5n70rS+KjQuxjr7AiKu/ByrDkFrN8Q0kwhATMVSBCbAUNVNKvIrK4/E8A6E7nLI3MHSrV5HjJHVeA4Ww= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=rasland@mellanox.com; Received: from mellanox.com (37.142.13.130) by AM3PR05MB1251.eurprd05.prod.outlook.com (2a01:111:e400:586f::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1228.24; Wed, 17 Oct 2018 08:56:15 +0000 From: Raslan Darawsheh To: keith.wiles@intel.com Cc: thomas@monjalon.net, dev@dpdk.org, shahafs@mellanox.com, rasland@mellanox.com, orika@mellanox.com, ferruh.yigit@intel.com Date: Wed, 17 Oct 2018 11:56:04 +0300 Message-Id: <1539766564-9433-3-git-send-email-rasland@mellanox.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1539766564-9433-1-git-send-email-rasland@mellanox.com> References: <1539182356-15496-2-git-send-email-rasland@mellanox.com> <1539766564-9433-1-git-send-email-rasland@mellanox.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [37.142.13.130] X-ClientProxiedBy: CWXP265CA0022.GBRP265.PROD.OUTLOOK.COM (2603:10a6:400:2e::34) To AM3PR05MB1251.eurprd05.prod.outlook.com (2a01:111:e400:586f::13) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1dc344c3-8586-4c14-e884-08d6340e65db X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: BCL:0; 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The file descriptors are shared via IPC Unix socket. Thanks to the IPC synchronization, the secondary process is now able to do Rx/Tx on a TAP created by the primary process. Signed-off-by: Raslan Darawsheh Signed-off-by: Thomas Monjalon --- v2: - translate file descriptors via IPC API - add documentation v3: - rabse the commit - use private static array for fd's to be local for each process v4: - removed TODO and FIXME tags - used strlcpy instead of strcpy v5: rebase the commit on top of Alejandro Lucero patch for secondary process private pointer. http://patches.dpdk.org/patch/46185/ v6: reword the commit log v7: rely on tap_device_count for registration --- --- doc/guides/nics/tap.rst | 16 ++++ doc/guides/rel_notes/release_18_11.rst | 5 ++ drivers/net/tap/Makefile | 1 + drivers/net/tap/meson.build | 1 + drivers/net/tap/rte_eth_tap.c | 150 ++++++++++++++++++++++++++++++++- 5 files changed, 172 insertions(+), 1 deletion(-) diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst index 2714868..9a3d7b3 100644 --- a/doc/guides/nics/tap.rst +++ b/doc/guides/nics/tap.rst @@ -152,6 +152,22 @@ Distribute IPv4 TCP packets using RSS to a given MAC address over queues 0-3:: testpmd> flow create 0 priority 4 ingress pattern eth dst is 0a:0b:0c:0d:0e:0f \ / ipv4 / tcp / end actions rss queues 0 1 2 3 end / end +Multi-process sharing +--------------------- + +It is possible to attach an existing TAP device in a secondary process, +by declaring it as a vdev with the same name as in the primary process, +and without any parameter. + +The port attached in a secondary process will give access to the +statistics and the queues. +Therefore it can be used for monitoring or Rx/Tx processing. + +The IPC synchronization of Rx/Tx queues is currently limited: + + - Maximum 8 queues shared + - Synchronized on probing, but not on later port update + Example ------- diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst index 2133a5b..3240b52 100644 --- a/doc/guides/rel_notes/release_18_11.rst +++ b/doc/guides/rel_notes/release_18_11.rst @@ -104,6 +104,11 @@ New Features the specified port. The port must be stopped before the command call in order to reconfigure queues. +* **Added TAP Rx/Tx queues sharing with a secondary process.** + + A secondary process can attach a TAP device created in the primary process, + probe the queues, and process Rx/Tx in a secondary process. + API Changes ----------- diff --git a/drivers/net/tap/Makefile b/drivers/net/tap/Makefile index 3243365..7748283 100644 --- a/drivers/net/tap/Makefile +++ b/drivers/net/tap/Makefile @@ -22,6 +22,7 @@ CFLAGS += -O3 CFLAGS += -I$(SRCDIR) CFLAGS += -I. CFLAGS += $(WERROR_FLAGS) +CFLAGS += -DALLOW_EXPERIMENTAL_API LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs -lrte_hash LDLIBS += -lrte_bus_vdev -lrte_gso diff --git a/drivers/net/tap/meson.build b/drivers/net/tap/meson.build index 37f65b7..f7e8852 100644 --- a/drivers/net/tap/meson.build +++ b/drivers/net/tap/meson.build @@ -35,6 +35,7 @@ args = [ 'TCA_ACT_BPF_FD' ], ] config = configuration_data() +allow_experimental_apis = true foreach arg:args config.set(arg[0], cc.has_header_symbol(arg[1], arg[2])) endforeach diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index 3372d54..cfb2648 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include #include @@ -62,6 +64,10 @@ #define TAP_GSO_MBUFS_NUM \ (TAP_GSO_MBUFS_PER_CORE * TAP_GSO_MBUF_CACHE_SIZE) +/* IPC key for queue fds sync */ +#define TAP_MP_KEY "tap_mp_sync_queues" + +static int tap_devices_count; static struct rte_vdev_driver pmd_tap_drv; static struct rte_vdev_driver pmd_tun_drv; @@ -100,6 +106,17 @@ enum ioctl_mode { REMOTE_ONLY, }; +/* Message header to synchronize queues via IPC */ +struct ipc_queues { + char port_name[RTE_DEV_NAME_MAX_LEN]; + int rxq_count; + int txq_count; + /* + * The file descriptors are in the dedicated part + * of the Unix message to be translated by the kernel. + */ +}; + static int tap_intr_handle_set(struct rte_eth_dev *dev, int set); /** @@ -2006,6 +2023,102 @@ rte_pmd_tun_probe(struct rte_vdev_device *dev) return ret; } +/* Request queue file descriptors from secondary to primary. */ +static int +tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev) +{ + int ret; + struct timespec timeout = {.tv_sec = 1, .tv_nsec = 0}; + struct rte_mp_msg request, *reply; + struct rte_mp_reply replies; + struct ipc_queues *request_param = (struct ipc_queues *)request.param; + struct ipc_queues *reply_param; + struct pmd_process_private *process_private = dev->process_private; + int queue, fd_iterator; + + /* Prepare the request */ + strlcpy(request.name, TAP_MP_KEY, sizeof(request.name)); + strlcpy(request_param->port_name, port_name, + sizeof(request_param->port_name)); + request.len_param = sizeof(*request_param); + /* Send request and receive reply */ + ret = rte_mp_request_sync(&request, &replies, &timeout); + if (ret < 0) { + TAP_LOG(ERR, "Failed to request queues from primary: %d", + rte_errno); + return -1; + } + reply = &replies.msgs[0]; + reply_param = (struct ipc_queues *)reply->param; + TAP_LOG(DEBUG, "Received IPC reply for %s", reply_param->port_name); + + /* Attach the queues from received file descriptors */ + dev->data->nb_rx_queues = reply_param->rxq_count; + dev->data->nb_tx_queues = reply_param->txq_count; + fd_iterator = 0; + for (queue = 0; queue < reply_param->rxq_count; queue++) + process_private->rxq_fds[queue] = reply->fds[fd_iterator++]; + for (queue = 0; queue < reply_param->txq_count; queue++) + process_private->txq_fds[queue] = reply->fds[fd_iterator++]; + + return 0; +} + +/* Send the queue file descriptors from the primary process to secondary. */ +static int +tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer) +{ + struct rte_eth_dev *dev; + struct pmd_process_private *process_private; + struct rte_mp_msg reply; + const struct ipc_queues *request_param = + (const struct ipc_queues *)request->param; + struct ipc_queues *reply_param = + (struct ipc_queues *)reply.param; + uint16_t port_id; + int queue; + int ret; + + /* Get requested port */ + TAP_LOG(DEBUG, "Received IPC request for %s", request_param->port_name); + ret = rte_eth_dev_get_port_by_name(request_param->port_name, &port_id); + if (ret) { + TAP_LOG(ERR, "Failed to get port id for %s", + request_param->port_name); + return -1; + } + dev = &rte_eth_devices[port_id]; + process_private = dev->process_private; + + /* Fill file descriptors for all queues */ + reply.num_fds = 0; + reply_param->rxq_count = 0; + for (queue = 0; queue < dev->data->nb_rx_queues; queue++) { + reply.fds[reply.num_fds++] = process_private->rxq_fds[queue]; + reply_param->rxq_count++; + } + RTE_ASSERT(reply_param->rxq_count == dev->data->nb_rx_queues); + RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues); + RTE_ASSERT(reply.num_fds <= RTE_MP_MAX_FD_NUM); + + reply_param->txq_count = 0; + for (queue = 0; queue < dev->data->nb_tx_queues; queue++) { + reply.fds[reply.num_fds++] = process_private->txq_fds[queue]; + reply_param->txq_count++; + } + + /* Send reply */ + strlcpy(reply.name, request->name, sizeof(reply.name)); + strlcpy(reply_param->port_name, request_param->port_name, + sizeof(reply_param->port_name)); + reply.len_param = sizeof(*reply_param); + if (rte_mp_reply(&reply, peer) < 0) { + TAP_LOG(ERR, "Failed to reply an IPC request to sync queues"); + return -1; + } + return 0; +} + /* Open a TAP interface device. */ static int @@ -2032,9 +2145,28 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev) TAP_LOG(ERR, "Failed to probe %s", name); return -1; } - /* TODO: request info from primary to set up Rx and Tx */ eth_dev->dev_ops = &ops; eth_dev->device = &dev->device; + eth_dev->rx_pkt_burst = pmd_rx_burst; + eth_dev->tx_pkt_burst = pmd_tx_burst; + if (!rte_eal_primary_proc_alive(NULL)) { + TAP_LOG(ERR, "Primary process is missing"); + return -1; + } + eth_dev->process_private = (struct pmd_process_private *) + rte_zmalloc_socket(name, + sizeof(struct pmd_process_private), + RTE_CACHE_LINE_SIZE, + eth_dev->device->numa_node); + if (eth_dev->process_private == NULL) { + TAP_LOG(ERR, + "Failed to alloc memory for process private"); + return -1; + } + + ret = tap_mp_attach_queues(name, eth_dev); + if (ret != 0) + return -1; rte_eth_dev_probing_finish(eth_dev); return 0; } @@ -2082,6 +2214,16 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev) TAP_LOG(NOTICE, "Initializing pmd_tap for %s as %s", name, tap_name); + /* Register IPC feed callback */ + if (!tap_devices_count) { + ret = rte_mp_action_register(TAP_MP_KEY, tap_mp_sync_queues); + if (ret < 0) { + TAP_LOG(ERR, "%s: Failed to register IPC callback: %s", + tuntap_name, strerror(rte_errno)); + goto leave; + } + } + tap_devices_count++; ret = eth_dev_tap_create(dev, tap_name, remote_iface, &user_mac, ETH_TUNTAP_TYPE_TAP); @@ -2089,6 +2231,9 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev) if (ret == -1) { TAP_LOG(ERR, "Failed to create pmd for %s as %s", name, tap_name); + if (!tap_devices_count) + rte_mp_action_unregister(TAP_MP_KEY); + tap_devices_count--; tap_unit--; /* Restore the unit number */ } rte_kvargs_free(kvlist); @@ -2137,6 +2282,9 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev) close(internals->ioctl_sock); rte_free(eth_dev->data->dev_private); rte_free(eth_dev->process_private); + if (tap_devices_count == 1) + rte_mp_action_unregister(TAP_MP_KEY); + tap_devices_count--; rte_eth_dev_release_port(eth_dev); if (internals->ka_fd != -1) { -- 2.7.4