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net/mlx5: EQ, Introduce atomic notifier chain subscription API 

Use atomic_notifier_chain to fire firmware events at internal mlx5 core
components such as eswitch/fpga/clock/FW tracer/etc.., this is to
avoid explicit calls from low level mlx5_core to upper components and to
simplify the mlx5_core API for future developments.

Simply provide register/unregister notifiers API and call the notifier
chain on firmware async events.

Example: to subscribe to a FW event:
struct mlx5_nb port_event;

MLX5_NB_INIT(&port_event, port_event_handler, PORT_CHANGE);
mlx5_eq_notifier_register(mdev, &port_event);

where:
 - port_event_handler is the notifier block callback.
 - PORT_EVENT is the suffix of MLX5_EVENT_TYPE_PORT_CHANGE.

The above will guarantee that port_event_handler will receive all FW
events of the type MLX5_EVENT_TYPE_PORT_CHANGE.

To receive all FW/HW events one can subscribe to
MLX5_EVENT_TYPE_NOTIFY_ANY.

The next few patches will start moving all mlx5 core components to use
this new API and cleanup mlx5_eq_async_int misx handler from component
explicit calls and specific logic.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Saeed Mahameed 2018-11-20 14:12:18 -08:00
parent 6d2d6fc83a
commit 0f597ed435
5 changed files with 72 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/net/ethernet/mellanox/mlx5/core/eq.c
View File

@ -31,6 +31,7 @@
*/
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/module.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/eq.h>
@ -68,8 +69,10 @@ struct mlx5_irq_info {
struct mlx5_eq_table {
struct list_head comp_eqs_list;
struct mlx5_eq pages_eq;
struct mlx5_eq async_eq;
struct mlx5_eq cmd_eq;
struct mlx5_eq async_eq;
struct atomic_notifier_head nh[MLX5_EVENT_TYPE_MAX];
struct mutex lock; /* sync async eqs creations */
int num_comp_vectors;
@ -316,13 +319,17 @@ u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq)
static irqreturn_t mlx5_eq_async_int(int irq, void *eq_ptr)
{
struct mlx5_eq *eq = eq_ptr;
struct mlx5_core_dev *dev = eq->dev;
struct mlx5_eq_table *eqt;
struct mlx5_core_dev *dev;
struct mlx5_eqe *eqe;
int set_ci = 0;
u32 cqn = -1;
u32 rsn;
u8 port;
dev = eq->dev;
eqt = dev->priv.eq_table;
while ((eqe = next_eqe_sw(eq))) {
/*
* Make sure we read EQ entry contents after we've
@ -437,6 +444,13 @@ static irqreturn_t mlx5_eq_async_int(int irq, void *eq_ptr)
break;
}
if (likely(eqe->type < MLX5_EVENT_TYPE_MAX))
atomic_notifier_call_chain(&eqt->nh[eqe->type], eqe->type, eqe);
else
mlx5_core_warn_once(dev, "notifier_call_chain is not setup for eqe: %d\n", eqe->type);
atomic_notifier_call_chain(&eqt->nh[MLX5_EVENT_TYPE_NOTIFY_ANY], eqe->type, eqe);
++eq->cons_index;
++set_ci;
@ -625,7 +639,7 @@ int mlx5_eq_del_cq(struct mlx5_eq *eq, struct mlx5_core_cq *cq)
int mlx5_eq_table_init(struct mlx5_core_dev *dev)
{
struct mlx5_eq_table *eq_table;
int err;
int i, err;
eq_table = kvzalloc(sizeof(*eq_table), GFP_KERNEL);
if (!eq_table)
@ -638,6 +652,8 @@ int mlx5_eq_table_init(struct mlx5_core_dev *dev)
goto kvfree_eq_table;
mutex_init(&eq_table->lock);
for (i = 0; i < MLX5_EVENT_TYPE_MAX; i++)
ATOMIC_INIT_NOTIFIER_HEAD(&eq_table->nh[i]);
return 0;
@ -1202,3 +1218,23 @@ void mlx5_eq_table_destroy(struct mlx5_core_dev *dev)
destroy_async_eqs(dev);
free_irq_vectors(dev);
}
int mlx5_eq_notifier_register(struct mlx5_core_dev *dev, struct mlx5_nb *nb)
{
struct mlx5_eq_table *eqt = dev->priv.eq_table;
if (nb->event_type >= MLX5_EVENT_TYPE_MAX)
return -EINVAL;
return atomic_notifier_chain_register(&eqt->nh[nb->event_type], &nb->nb);
}
int mlx5_eq_notifier_unregister(struct mlx5_core_dev *dev, struct mlx5_nb *nb)
{
struct mlx5_eq_table *eqt = dev->priv.eq_table;
if (nb->event_type >= MLX5_EVENT_TYPE_MAX)
return -EINVAL;
return atomic_notifier_chain_unregister(&eqt->nh[nb->event_type], &nb->nb);
}

5
drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h
View File

@ -4,6 +4,8 @@
#ifndef __LIB_MLX5_EQ_H__
#define __LIB_MLX5_EQ_H__
#include <linux/mlx5/driver.h>
#include <linux/mlx5/eq.h>
#include <linux/mlx5/cq.h>
#define MLX5_MAX_IRQ_NAME (32)
#define MLX5_EQE_SIZE (sizeof(struct mlx5_eqe))
@ -90,4 +92,7 @@ void mlx5_core_eq_free_irqs(struct mlx5_core_dev *dev);
struct cpu_rmap *mlx5_eq_table_get_rmap(struct mlx5_core_dev *dev);
#endif
int mlx5_eq_notifier_register(struct mlx5_core_dev *dev, struct mlx5_nb *nb);
int mlx5_eq_notifier_unregister(struct mlx5_core_dev *dev, struct mlx5_nb *nb);
#endif

5
drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
View File

@ -78,6 +78,11 @@ do { \
__func__, __LINE__, current->pid, \
##__VA_ARGS__)
#define mlx5_core_warn_once(__dev, format, ...) \
dev_warn_once(&(__dev)->pdev->dev, "%s:%d:(pid %d): " format, \
__func__, __LINE__, current->pid, \
##__VA_ARGS__)
#define mlx5_core_info(__dev, format, ...) \
dev_info(&(__dev)->pdev->dev, format, ##__VA_ARGS__)

10
include/linux/mlx5/device.h
View File

@ -301,9 +301,15 @@ enum {
MLX5_EVENT_QUEUE_TYPE_DCT = 6,
};
/* mlx5 components can subscribe to any one of these events via
* mlx5_eq_notifier_register API.
*/
enum mlx5_event {
/* Special value to subscribe to any event */
MLX5_EVENT_TYPE_NOTIFY_ANY = 0x0,
/* HW events enum start: comp events are not subscribable */
MLX5_EVENT_TYPE_COMP = 0x0,
/* HW Async events enum start: subscribable events */
MLX5_EVENT_TYPE_PATH_MIG = 0x01,
MLX5_EVENT_TYPE_COMM_EST = 0x02,
MLX5_EVENT_TYPE_SQ_DRAINED = 0x03,
@ -341,6 +347,8 @@ enum mlx5_event {
MLX5_EVENT_TYPE_FPGA_QP_ERROR = 0x21,
MLX5_EVENT_TYPE_DEVICE_TRACER = 0x26,
MLX5_EVENT_TYPE_MAX = MLX5_EVENT_TYPE_DEVICE_TRACER + 1,
};
enum {

16
include/linux/mlx5/eq.h
View File

@ -4,8 +4,6 @@
#ifndef MLX5_CORE_EQ_H
#define MLX5_CORE_EQ_H
#include <linux/mlx5/driver.h>
enum {
MLX5_EQ_PAGEREQ_IDX = 0,
MLX5_EQ_CMD_IDX = 1,
@ -22,6 +20,7 @@ enum {
#define MLX5_NUM_SPARE_EQE (0x80)
struct mlx5_eq;
struct mlx5_core_dev;
struct mlx5_eq_param {
u8 index;
@ -57,4 +56,17 @@ static inline u32 mlx5_eq_update_cc(struct mlx5_eq *eq, u32 cc)
return cc;
}
struct mlx5_nb {
struct notifier_block nb;
u8 event_type;
};
#define mlx5_nb_cof(ptr, type, member) \
(container_of(container_of(ptr, struct mlx5_nb, nb), type, member))
#define MLX5_NB_INIT(name, handler, event) do { \
(name)->nb.notifier_call = handler; \
(name)->event_type = MLX5_EVENT_TYPE_##event; \
} while (0)
#endif /* MLX5_CORE_EQ_H */