[dpdk-dev] [PATCH v2 11/13] net/mlx5: update install/uninstall int handler routines

[Viacheslav Ovsiienko]

We are implementing the support for multport Infiniband device
withj representors attached to these multiple ports. Asynchronous
device event notifications (link status change, removal event, etc.)
should be shared between ports. We are going to implement shared
event handler and this patch introduces appropriate device
structure changes and updated event handler install and uninstall
routines.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo at mellanox.com>
---
 drivers/net/mlx5/mlx5.c        |  19 ++++++-
 drivers/net/mlx5/mlx5.h        |   3 +-
 drivers/net/mlx5/mlx5_ethdev.c | 118 ++++++++++++++++++++++++++++++++---------
 3 files changed, 112 insertions(+), 28 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 27bd266..c78b139 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -165,6 +165,7 @@ struct mlx5_dev_spawn_data {
 {
 	struct mlx5_ibv_shared *sh;
 	int err = 0;
+	uint32_t i;
 
 	assert(spawn);
 	/* Secondary process should not create the shared context. */
@@ -213,6 +214,14 @@ struct mlx5_dev_spawn_data {
 		sizeof(sh->ibdev_name));
 	strncpy(sh->ibdev_path, sh->ctx->device->ibdev_path,
 		sizeof(sh->ibdev_path));
+	pthread_mutex_init(&sh->intr_mutex, NULL);
+	/*
+	 * Setting port_id to max unallowed value means
+	 * there is no interrupt subhandler installed for
+	 * the given port index i.
+	 */
+	for (i = 0; i < sh->max_port; i++)
+		sh->port[i].ih_port_id = RTE_MAX_ETHPORTS;
 	sh->pd = mlx5_glue->alloc_pd(sh->ctx);
 	if (sh->pd == NULL) {
 		DRV_LOG(ERR, "PD allocation failure");
@@ -267,6 +276,15 @@ struct mlx5_dev_spawn_data {
 		assert(!sh->pd);
 	}
 	LIST_REMOVE(sh, next);
+	/*
+	 *  Ensure there is no async event handler installed.
+	 *  Only primary process handles async device events.
+	 **/
+	assert(!sh->intr_cnt);
+	if (sh->intr_cnt)
+		rte_intr_callback_unregister
+			(&sh->intr_handle, mlx5_dev_interrupt_handler, sh);
+	pthread_mutex_destroy(&sh->intr_mutex);
 	if (sh->pd)
 		claim_zero(mlx5_glue->dealloc_pd(sh->pd));
 	if (sh->ctx)
@@ -274,7 +292,6 @@ struct mlx5_dev_spawn_data {
 	rte_free(sh);
 }
 
-
 /**
  * Prepare shared data between primary and secondary process.
  */
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 597e3af..853655b 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -222,6 +222,8 @@ struct mlx5_ibv_shared {
 	char ibdev_name[IBV_SYSFS_NAME_MAX]; /* IB device name. */
 	char ibdev_path[IBV_SYSFS_PATH_MAX]; /* IB device path for secondary */
 	struct ibv_device_attr_ex device_attr; /* Device properties. */
+	pthread_mutex_t intr_mutex; /* Interrupt config mutex. */
+	uint32_t intr_cnt; /* Interrupt handler reference counter. */
 	struct rte_intr_handle intr_handle; /* Interrupt handler for device. */
 	struct mlx5_ibv_shared_port port[]; /* per device port data array. */
 };
@@ -251,7 +253,6 @@ struct mlx5_priv {
 	struct mlx5_txq_data *(*txqs)[]; /* TX queues. */
 	struct rte_mempool *mprq_mp; /* Mempool for Multi-Packet RQ. */
 	struct rte_eth_rss_conf rss_conf; /* RSS configuration. */
-	struct rte_intr_handle intr_handle; /* Interrupt handler. */
 	unsigned int (*reta_idx)[]; /* RETA index table. */
 	unsigned int reta_idx_n; /* RETA index size. */
 	struct mlx5_drop drop_queue; /* Flow drop queues. */
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index a44a383..d41f66b 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -1109,6 +1109,96 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
 }
 
 /**
+ * Uninstall shared asynchronous device events handler.
+ * This function is implemeted to support event sharing
+ * between multiple ports of single IB device.
+ *
+ * @param dev
+ *   Pointer to Ethernet device.
+ */
+static void
+mlx5_dev_shared_handler_uninstall(struct rte_eth_dev *dev)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+	struct mlx5_ibv_shared *sh = priv->sh;
+
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return;
+	pthread_mutex_lock(&sh->intr_mutex);
+	assert(priv->ibv_port);
+	assert(priv->ibv_port <= sh->max_port);
+	assert(dev->data->port_id < RTE_MAX_ETHPORTS);
+	if (sh->port[priv->ibv_port - 1].ih_port_id >= RTE_MAX_ETHPORTS)
+		goto exit;
+	assert(sh->port[priv->ibv_port - 1].port_id ==
+					(uint32_t)dev->data->port_id);
+	assert(sh->intr_cnt);
+	sh->port[priv->ibv_port - 1].ih_port_id = RTE_MAX_ETHPORTS;
+	if (!sh->intr_cnt || --sh->intr_cnt)
+		goto exit;
+	rte_intr_callback_unregister(&sh->intr_handle,
+				     mlx5_dev_interrupt_handler, sh);
+	sh->intr_handle.fd = 0;
+	sh->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+exit:
+	pthread_mutex_unlock(&sh->intr_mutex);
+}
+
+/**
+ * Install shared asyncronous device events handler.
+ * This function is implemeted to support event sharing
+ * between multiple ports of single IB device.
+ *
+ * @param dev
+ *   Pointer to Ethernet device.
+ */
+static void
+mlx5_dev_shared_handler_install(struct rte_eth_dev *dev)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+	struct mlx5_ibv_shared *sh = priv->sh;
+	int ret;
+	int flags;
+
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return;
+	pthread_mutex_lock(&sh->intr_mutex);
+	assert(priv->ibv_port);
+	assert(priv->ibv_port <= sh->max_port);
+	assert(dev->data->port_id < RTE_MAX_ETHPORTS);
+	if (sh->port[priv->ibv_port - 1].ih_port_id < RTE_MAX_ETHPORTS) {
+		/* The handler is already installed for this port. */
+		assert(sh->intr_cnt);
+		goto exit;
+	}
+	sh->port[priv->ibv_port - 1].ih_port_id = (uint32_t)dev->data->port_id;
+	if (sh->intr_cnt) {
+		sh->intr_cnt++;
+		goto exit;
+	}
+	/* No shared handler installed. */
+	assert(sh->ctx->async_fd > 0);
+	flags = fcntl(sh->ctx->async_fd, F_GETFL);
+	ret = fcntl(sh->ctx->async_fd, F_SETFL, flags | O_NONBLOCK);
+	if (ret) {
+		DRV_LOG(INFO, "failed to change file descriptor"
+			      " async event queue");
+		/* Indicate there will be no interrupts. */
+		dev->data->dev_conf.intr_conf.lsc = 0;
+		dev->data->dev_conf.intr_conf.rmv = 0;
+		sh->port[priv->ibv_port - 1].ih_port_id = RTE_MAX_ETHPORTS;
+		goto exit;
+	}
+	sh->intr_handle.fd = sh->ctx->async_fd;
+	sh->intr_handle.type = RTE_INTR_HANDLE_EXT;
+	rte_intr_callback_register(&sh->intr_handle,
+				   mlx5_dev_interrupt_handler, sh);
+	sh->intr_cnt++;
+exit:
+	pthread_mutex_unlock(&sh->intr_mutex);
+}
+
+/**
  * Uninstall interrupt handler.
  *
  * @param dev
@@ -1119,15 +1209,10 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
 
-	if (dev->data->dev_conf.intr_conf.lsc ||
-	    dev->data->dev_conf.intr_conf.rmv)
-		rte_intr_callback_unregister(&priv->intr_handle,
-					     mlx5_dev_interrupt_handler, dev);
+	mlx5_dev_shared_handler_uninstall(dev);
 	if (priv->primary_socket)
 		rte_intr_callback_unregister(&priv->intr_handle_socket,
 					     mlx5_dev_handler_socket, dev);
-	priv->intr_handle.fd = 0;
-	priv->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
 	priv->intr_handle_socket.fd = 0;
 	priv->intr_handle_socket.type = RTE_INTR_HANDLE_UNKNOWN;
 }
@@ -1142,28 +1227,9 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
 mlx5_dev_interrupt_handler_install(struct rte_eth_dev *dev)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
-	struct ibv_context *ctx = priv->sh->ctx;
 	int ret;
-	int flags;
 
-	assert(ctx->async_fd > 0);
-	flags = fcntl(ctx->async_fd, F_GETFL);
-	ret = fcntl(ctx->async_fd, F_SETFL, flags | O_NONBLOCK);
-	if (ret) {
-		DRV_LOG(INFO,
-			"port %u failed to change file descriptor async event"
-			" queue",
-			dev->data->port_id);
-		dev->data->dev_conf.intr_conf.lsc = 0;
-		dev->data->dev_conf.intr_conf.rmv = 0;
-	}
-	if (dev->data->dev_conf.intr_conf.lsc ||
-	    dev->data->dev_conf.intr_conf.rmv) {
-		priv->intr_handle.fd = ctx->async_fd;
-		priv->intr_handle.type = RTE_INTR_HANDLE_EXT;
-		rte_intr_callback_register(&priv->intr_handle,
-					   mlx5_dev_interrupt_handler, dev);
-	}
+	mlx5_dev_shared_handler_install(dev);
 	ret = mlx5_socket_init(dev);
 	if (ret)
 		DRV_LOG(ERR, "port %u cannot initialise socket: %s",
-- 
1.8.3.1