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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-05-10 11:43:46 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-05-10 11:43:46 -0700 |
commit | 2a267e7c41aa88215de2b542de797d03d16ecdfd (patch) | |
tree | b949270835e304c8b60a40cde1b2c2e19c13b33a /drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c | |
parent | Input: libps2 - mark expected switch fall-through (diff) | |
parent | Linux 5.1 (diff) | |
download | linux-dev-2a267e7c41aa88215de2b542de797d03d16ecdfd.tar.xz linux-dev-2a267e7c41aa88215de2b542de797d03d16ecdfd.zip |
Merge tag 'v5.1' into next
Sync up with mainline to bring in the latest APIs.
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c')
-rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c new file mode 100644 index 000000000000..bced2efe9bef --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c @@ -0,0 +1,255 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* Copyright (c) 2018 Mellanox Technologies */ + +#include <linux/mlx5/vport.h> +#include "lib/devcom.h" + +static LIST_HEAD(devcom_list); + +#define devcom_for_each_component(priv, comp, iter) \ + for (iter = 0; \ + comp = &(priv)->components[iter], iter < MLX5_DEVCOM_NUM_COMPONENTS; \ + iter++) + +struct mlx5_devcom_component { + struct { + void *data; + } device[MLX5_MAX_PORTS]; + + mlx5_devcom_event_handler_t handler; + struct rw_semaphore sem; + bool paired; +}; + +struct mlx5_devcom_list { + struct list_head list; + + struct mlx5_devcom_component components[MLX5_DEVCOM_NUM_COMPONENTS]; + struct mlx5_core_dev *devs[MLX5_MAX_PORTS]; +}; + +struct mlx5_devcom { + struct mlx5_devcom_list *priv; + int idx; +}; + +static struct mlx5_devcom_list *mlx5_devcom_list_alloc(void) +{ + struct mlx5_devcom_component *comp; + struct mlx5_devcom_list *priv; + int i; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return NULL; + + devcom_for_each_component(priv, comp, i) + init_rwsem(&comp->sem); + + return priv; +} + +static struct mlx5_devcom *mlx5_devcom_alloc(struct mlx5_devcom_list *priv, + u8 idx) +{ + struct mlx5_devcom *devcom; + + devcom = kzalloc(sizeof(*devcom), GFP_KERNEL); + if (!devcom) + return NULL; + + devcom->priv = priv; + devcom->idx = idx; + return devcom; +} + +/* Must be called with intf_mutex held */ +struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev) +{ + struct mlx5_devcom_list *priv = NULL, *iter; + struct mlx5_devcom *devcom = NULL; + bool new_priv = false; + u64 sguid0, sguid1; + int idx, i; + + if (!mlx5_core_is_pf(dev)) + return NULL; + + sguid0 = mlx5_query_nic_system_image_guid(dev); + list_for_each_entry(iter, &devcom_list, list) { + struct mlx5_core_dev *tmp_dev = NULL; + + idx = -1; + for (i = 0; i < MLX5_MAX_PORTS; i++) { + if (iter->devs[i]) + tmp_dev = iter->devs[i]; + else + idx = i; + } + + if (idx == -1) + continue; + + sguid1 = mlx5_query_nic_system_image_guid(tmp_dev); + if (sguid0 != sguid1) + continue; + + priv = iter; + break; + } + + if (!priv) { + priv = mlx5_devcom_list_alloc(); + if (!priv) + return ERR_PTR(-ENOMEM); + + idx = 0; + new_priv = true; + } + + priv->devs[idx] = dev; + devcom = mlx5_devcom_alloc(priv, idx); + if (!devcom) { + kfree(priv); + return ERR_PTR(-ENOMEM); + } + + if (new_priv) + list_add(&priv->list, &devcom_list); + + return devcom; +} + +/* Must be called with intf_mutex held */ +void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom) +{ + struct mlx5_devcom_list *priv; + int i; + + if (IS_ERR_OR_NULL(devcom)) + return; + + priv = devcom->priv; + priv->devs[devcom->idx] = NULL; + + kfree(devcom); + + for (i = 0; i < MLX5_MAX_PORTS; i++) + if (priv->devs[i]) + break; + + if (i != MLX5_MAX_PORTS) + return; + + list_del(&priv->list); + kfree(priv); +} + +void mlx5_devcom_register_component(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id, + mlx5_devcom_event_handler_t handler, + void *data) +{ + struct mlx5_devcom_component *comp; + + if (IS_ERR_OR_NULL(devcom)) + return; + + WARN_ON(!data); + + comp = &devcom->priv->components[id]; + down_write(&comp->sem); + comp->handler = handler; + comp->device[devcom->idx].data = data; + up_write(&comp->sem); +} + +void mlx5_devcom_unregister_component(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id) +{ + struct mlx5_devcom_component *comp; + + if (IS_ERR_OR_NULL(devcom)) + return; + + comp = &devcom->priv->components[id]; + down_write(&comp->sem); + comp->device[devcom->idx].data = NULL; + up_write(&comp->sem); +} + +int mlx5_devcom_send_event(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id, + int event, + void *event_data) +{ + struct mlx5_devcom_component *comp; + int err = -ENODEV, i; + + if (IS_ERR_OR_NULL(devcom)) + return err; + + comp = &devcom->priv->components[id]; + down_write(&comp->sem); + for (i = 0; i < MLX5_MAX_PORTS; i++) + if (i != devcom->idx && comp->device[i].data) { + err = comp->handler(event, comp->device[i].data, + event_data); + break; + } + + up_write(&comp->sem); + return err; +} + +void mlx5_devcom_set_paired(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id, + bool paired) +{ + struct mlx5_devcom_component *comp; + + comp = &devcom->priv->components[id]; + WARN_ON(!rwsem_is_locked(&comp->sem)); + + comp->paired = paired; +} + +bool mlx5_devcom_is_paired(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id) +{ + if (IS_ERR_OR_NULL(devcom)) + return false; + + return devcom->priv->components[id].paired; +} + +void *mlx5_devcom_get_peer_data(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id) +{ + struct mlx5_devcom_component *comp; + int i; + + if (IS_ERR_OR_NULL(devcom)) + return NULL; + + comp = &devcom->priv->components[id]; + down_read(&comp->sem); + if (!comp->paired) { + up_read(&comp->sem); + return NULL; + } + + for (i = 0; i < MLX5_MAX_PORTS; i++) + if (i != devcom->idx) + break; + + return comp->device[i].data; +} + +void mlx5_devcom_release_peer_data(struct mlx5_devcom *devcom, + enum mlx5_devcom_components id) +{ + struct mlx5_devcom_component *comp = &devcom->priv->components[id]; + + up_read(&comp->sem); +} |