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net/mlx4_en: Add a service task

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Add a service task to run tasks that needed to be executed periodically.
Currently the only task is a watchdog to catch NIC clock overflow, to make
timestamping accurate.
Will move the statistics task into this framework in a later patch.

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2013-04-23 06:06:51 +00:00 committed by David S. Miller
parent eb0cabbd1b
commit b6c39bfcf1
3 changed files with 47 additions and 0 deletions
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19
drivers/net/ethernet/mellanox/mlx4/en_clock.c
View file

@ -129,4 +129,23 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
timecounter_init(&mdev->clock, &mdev->cycles,
ktime_to_ns(ktime_get_real()));
/* Calculate period in seconds to call the overflow watchdog - to make
* sure counter is checked at least once every wrap around.
*/
mdev->overflow_period =
(cyclecounter_cyc2ns(&mdev->cycles,
mdev->cycles.mask) / NSEC_PER_SEC / 2)
* HZ;
}
void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev)
{
bool timeout = time_is_before_jiffies(mdev->last_overflow_check +
mdev->overflow_period);
if (timeout) {
timecounter_read(&mdev->clock);
mdev->last_overflow_check = jiffies;
}
}

24
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View file

@ -1361,6 +1361,26 @@ static void mlx4_en_do_get_stats(struct work_struct *work)
mutex_unlock(&mdev->state_lock);
}
/* mlx4_en_service_task - Run service task for tasks that needed to be done
* periodically
*/
static void mlx4_en_service_task(struct work_struct *work)
{
struct delayed_work *delay = to_delayed_work(work);
struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
service_task);
struct mlx4_en_dev *mdev = priv->mdev;
mutex_lock(&mdev->state_lock);
if (mdev->device_up) {
mlx4_en_ptp_overflow_check(mdev);
queue_delayed_work(mdev->workqueue, &priv->service_task,
SERVICE_TASK_DELAY);
}
mutex_unlock(&mdev->state_lock);
}
static void mlx4_en_linkstate(struct work_struct *work)
{
struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
@ -1865,6 +1885,7 @@ void mlx4_en_destroy_netdev(struct net_device *dev)
mlx4_free_hwq_res(mdev->dev, &priv->res, MLX4_EN_PAGE_SIZE);
cancel_delayed_work(&priv->stats_task);
cancel_delayed_work(&priv->service_task);
/* flush any pending task for this netdev */
flush_workqueue(mdev->workqueue);
@ -2084,6 +2105,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
INIT_WORK(&priv->watchdog_task, mlx4_en_restart);
INIT_WORK(&priv->linkstate_task, mlx4_en_linkstate);
INIT_DELAYED_WORK(&priv->stats_task, mlx4_en_do_get_stats);
INIT_DELAYED_WORK(&priv->service_task, mlx4_en_service_task);
#ifdef CONFIG_MLX4_EN_DCB
if (!mlx4_is_slave(priv->mdev->dev)) {
if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_SET_ETH_SCHED) {
@ -2206,6 +2228,8 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
}
mlx4_en_set_default_moderation(priv);
queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
queue_delayed_work(mdev->workqueue, &priv->service_task,
SERVICE_TASK_DELAY);
return 0;
out:

4
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View file

@ -78,6 +78,7 @@
#define STAMP_SHIFT 31
#define STAMP_VAL 0x7fffffff
#define STATS_DELAY (HZ / 4)
#define SERVICE_TASK_DELAY (HZ / 4)
#define MAX_NUM_OF_FS_RULES 256
#define MLX4_EN_FILTER_HASH_SHIFT 4
@ -355,6 +356,7 @@ struct mlx4_en_dev {
struct cyclecounter cycles;
struct timecounter clock;
unsigned long last_overflow_check;
unsigned long overflow_period;
};
@ -519,6 +521,7 @@ struct mlx4_en_priv {
struct work_struct watchdog_task;
struct work_struct linkstate_task;
struct delayed_work stats_task;
struct delayed_work service_task;
struct mlx4_en_perf_stats pstats;
struct mlx4_en_pkt_stats pkstats;
struct mlx4_en_port_stats port_stats;
@ -645,6 +648,7 @@ void mlx4_en_cleanup_filters(struct mlx4_en_priv *priv,
#define MLX4_EN_NUM_SELF_TEST 5
void mlx4_en_ex_selftest(struct net_device *dev, u32 *flags, u64 *buf);
u64 mlx4_en_mac_to_u64(u8 *addr);
void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev);
/*
* Functions for time stamping