From d69a24e036596877ce08c25ab8e63a202412fd9e Mon Sep 17 00:00:00 2001 From: Daniel Jurgens Date: Thu, 4 Jan 2018 17:25:37 +0200 Subject: [PATCH] IB/mlx5: Move IB event processing onto a workqueue Because mlx5_ib_event can be called from atomic context move event handling onto a workqueue. A mutex lock is required to get the IB device for slave ports, so move event processing onto a work queue. When an IB event is received, check if the mlx5_core_dev is a slave port, if so attempt to get the IB device it's affiliated with. If found process the event for that device, otherwise return. Signed-off-by: Daniel Jurgens Reviewed-by: Parav Pandit Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/mlx5/main.c | 69 +++++++++++++++++++++++++------ 1 file changed, 56 insertions(+), 13 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 4fbbe4c7a99b..0ff6da1b885f 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -70,10 +70,19 @@ static char mlx5_version[] = DRIVER_NAME ": Mellanox Connect-IB Infiniband driver v" DRIVER_VERSION "\n"; +struct mlx5_ib_event_work { + struct work_struct work; + struct mlx5_core_dev *dev; + void *context; + enum mlx5_dev_event event; + unsigned long param; +}; + enum { MLX5_ATOMIC_SIZE_QP_8BYTES = 1 << 3, }; +static struct workqueue_struct *mlx5_ib_event_wq; static LIST_HEAD(mlx5_ib_unaffiliated_port_list); static LIST_HEAD(mlx5_ib_dev_list); /* @@ -3132,15 +3141,24 @@ static void delay_drop_handler(struct work_struct *work) mutex_unlock(&delay_drop->lock); } -static void mlx5_ib_event(struct mlx5_core_dev *dev, void *context, - enum mlx5_dev_event event, unsigned long param) +static void mlx5_ib_handle_event(struct work_struct *_work) { - struct mlx5_ib_dev *ibdev = (struct mlx5_ib_dev *)context; + struct mlx5_ib_event_work *work = + container_of(_work, struct mlx5_ib_event_work, work); + struct mlx5_ib_dev *ibdev; struct ib_event ibev; bool fatal = false; u8 port = 0; - switch (event) { + if (mlx5_core_is_mp_slave(work->dev)) { + ibdev = mlx5_ib_get_ibdev_from_mpi(work->context); + if (!ibdev) + goto out; + } else { + ibdev = work->context; + } + + switch (work->event) { case MLX5_DEV_EVENT_SYS_ERROR: ibev.event = IB_EVENT_DEVICE_FATAL; mlx5_ib_handle_internal_error(ibdev); @@ -3150,39 +3168,39 @@ static void mlx5_ib_event(struct mlx5_core_dev *dev, void *context, case MLX5_DEV_EVENT_PORT_UP: case MLX5_DEV_EVENT_PORT_DOWN: case MLX5_DEV_EVENT_PORT_INITIALIZED: - port = (u8)param; + port = (u8)work->param; /* In RoCE, port up/down events are handled in * mlx5_netdev_event(). */ if (mlx5_ib_port_link_layer(&ibdev->ib_dev, port) == IB_LINK_LAYER_ETHERNET) - return; + goto out; - ibev.event = (event == MLX5_DEV_EVENT_PORT_UP) ? + ibev.event = (work->event == MLX5_DEV_EVENT_PORT_UP) ? IB_EVENT_PORT_ACTIVE : IB_EVENT_PORT_ERR; break; case MLX5_DEV_EVENT_LID_CHANGE: ibev.event = IB_EVENT_LID_CHANGE; - port = (u8)param; + port = (u8)work->param; break; case MLX5_DEV_EVENT_PKEY_CHANGE: ibev.event = IB_EVENT_PKEY_CHANGE; - port = (u8)param; + port = (u8)work->param; schedule_work(&ibdev->devr.ports[port - 1].pkey_change_work); break; case MLX5_DEV_EVENT_GUID_CHANGE: ibev.event = IB_EVENT_GID_CHANGE; - port = (u8)param; + port = (u8)work->param; break; case MLX5_DEV_EVENT_CLIENT_REREG: ibev.event = IB_EVENT_CLIENT_REREGISTER; - port = (u8)param; + port = (u8)work->param; break; case MLX5_DEV_EVENT_DELAY_DROP_TIMEOUT: schedule_work(&ibdev->delay_drop.delay_drop_work); @@ -3204,9 +3222,29 @@ static void mlx5_ib_event(struct mlx5_core_dev *dev, void *context, if (fatal) ibdev->ib_active = false; - out: - return; + kfree(work); +} + +static void mlx5_ib_event(struct mlx5_core_dev *dev, void *context, + enum mlx5_dev_event event, unsigned long param) +{ + struct mlx5_ib_event_work *work; + + work = kmalloc(sizeof(*work), GFP_ATOMIC); + if (work) { + INIT_WORK(&work->work, mlx5_ib_handle_event); + work->dev = dev; + work->param = param; + work->context = context; + work->event = event; + + queue_work(mlx5_ib_event_wq, &work->work); + return; + } + + dev_warn(&dev->pdev->dev, "%s: mlx5_dev_event: %d, with param: %lu dropped, couldn't allocate memory.\n", + __func__, event, param); } static int set_has_smi_cap(struct mlx5_ib_dev *dev) @@ -4917,6 +4955,10 @@ static int __init mlx5_ib_init(void) { int err; + mlx5_ib_event_wq = alloc_ordered_workqueue("mlx5_ib_event_wq", 0); + if (!mlx5_ib_event_wq) + return -ENOMEM; + mlx5_ib_odp_init(); err = mlx5_register_interface(&mlx5_ib_interface); @@ -4927,6 +4969,7 @@ static int __init mlx5_ib_init(void) static void __exit mlx5_ib_cleanup(void) { mlx5_unregister_interface(&mlx5_ib_interface); + destroy_workqueue(mlx5_ib_event_wq); } module_init(mlx5_ib_init); -- 2.30.2