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net/mlx4_en: Add a service task
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>
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@ -129,4 +129,23 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
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timecounter_init(&mdev->clock, &mdev->cycles,
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ktime_to_ns(ktime_get_real()));
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/* Calculate period in seconds to call the overflow watchdog - to make
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* sure counter is checked at least once every wrap around.
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*/
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mdev->overflow_period =
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(cyclecounter_cyc2ns(&mdev->cycles,
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mdev->cycles.mask) / NSEC_PER_SEC / 2)
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* HZ;
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}
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void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev)
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{
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bool timeout = time_is_before_jiffies(mdev->last_overflow_check +
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mdev->overflow_period);
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if (timeout) {
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timecounter_read(&mdev->clock);
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mdev->last_overflow_check = jiffies;
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}
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}
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@ -1361,6 +1361,26 @@ static void mlx4_en_do_get_stats(struct work_struct *work)
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mutex_unlock(&mdev->state_lock);
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}
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/* mlx4_en_service_task - Run service task for tasks that needed to be done
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* periodically
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*/
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static void mlx4_en_service_task(struct work_struct *work)
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{
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struct delayed_work *delay = to_delayed_work(work);
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struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
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service_task);
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struct mlx4_en_dev *mdev = priv->mdev;
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mutex_lock(&mdev->state_lock);
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if (mdev->device_up) {
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mlx4_en_ptp_overflow_check(mdev);
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queue_delayed_work(mdev->workqueue, &priv->service_task,
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SERVICE_TASK_DELAY);
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}
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mutex_unlock(&mdev->state_lock);
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}
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static void mlx4_en_linkstate(struct work_struct *work)
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{
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struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
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@ -1865,6 +1885,7 @@ void mlx4_en_destroy_netdev(struct net_device *dev)
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mlx4_free_hwq_res(mdev->dev, &priv->res, MLX4_EN_PAGE_SIZE);
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cancel_delayed_work(&priv->stats_task);
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cancel_delayed_work(&priv->service_task);
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/* flush any pending task for this netdev */
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flush_workqueue(mdev->workqueue);
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@ -2084,6 +2105,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
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INIT_WORK(&priv->watchdog_task, mlx4_en_restart);
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INIT_WORK(&priv->linkstate_task, mlx4_en_linkstate);
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INIT_DELAYED_WORK(&priv->stats_task, mlx4_en_do_get_stats);
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INIT_DELAYED_WORK(&priv->service_task, mlx4_en_service_task);
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#ifdef CONFIG_MLX4_EN_DCB
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if (!mlx4_is_slave(priv->mdev->dev)) {
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if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_SET_ETH_SCHED) {
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@ -2206,6 +2228,8 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
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}
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mlx4_en_set_default_moderation(priv);
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queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
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queue_delayed_work(mdev->workqueue, &priv->service_task,
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SERVICE_TASK_DELAY);
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return 0;
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out:
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@ -78,6 +78,7 @@
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#define STAMP_SHIFT 31
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#define STAMP_VAL 0x7fffffff
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#define STATS_DELAY (HZ / 4)
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#define SERVICE_TASK_DELAY (HZ / 4)
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#define MAX_NUM_OF_FS_RULES 256
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#define MLX4_EN_FILTER_HASH_SHIFT 4
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@ -355,6 +356,7 @@ struct mlx4_en_dev {
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struct cyclecounter cycles;
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struct timecounter clock;
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unsigned long last_overflow_check;
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unsigned long overflow_period;
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};
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@ -519,6 +521,7 @@ struct mlx4_en_priv {
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struct work_struct watchdog_task;
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struct work_struct linkstate_task;
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struct delayed_work stats_task;
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struct delayed_work service_task;
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struct mlx4_en_perf_stats pstats;
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struct mlx4_en_pkt_stats pkstats;
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struct mlx4_en_port_stats port_stats;
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@ -645,6 +648,7 @@ void mlx4_en_cleanup_filters(struct mlx4_en_priv *priv,
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#define MLX4_EN_NUM_SELF_TEST 5
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void mlx4_en_ex_selftest(struct net_device *dev, u32 *flags, u64 *buf);
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u64 mlx4_en_mac_to_u64(u8 *addr);
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void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev);
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/*
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* Functions for time stamping
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