diff options
Diffstat (limited to 'drivers/infiniband/hw/cxgb3/iwch.c')
| -rw-r--r-- | drivers/infiniband/hw/cxgb3/iwch.c | 79 |
1 files changed, 75 insertions, 4 deletions
diff --git a/drivers/infiniband/hw/cxgb3/iwch.c b/drivers/infiniband/hw/cxgb3/iwch.c index b0ea0105ddf..d992543890e 100644 --- a/drivers/infiniband/hw/cxgb3/iwch.c +++ b/drivers/infiniband/hw/cxgb3/iwch.c @@ -65,6 +65,46 @@ struct cxgb3_client t3c_client = { static LIST_HEAD(dev_list); static DEFINE_MUTEX(dev_mutex); +static int disable_qp_db(int id, void *p, void *data) +{ + struct iwch_qp *qhp = p; + + cxio_disable_wq_db(&qhp->wq); + return 0; +} + +static int enable_qp_db(int id, void *p, void *data) +{ + struct iwch_qp *qhp = p; + + if (data) + ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid); + cxio_enable_wq_db(&qhp->wq); + return 0; +} + +static void disable_dbs(struct iwch_dev *rnicp) +{ + spin_lock_irq(&rnicp->lock); + idr_for_each(&rnicp->qpidr, disable_qp_db, NULL); + spin_unlock_irq(&rnicp->lock); +} + +static void enable_dbs(struct iwch_dev *rnicp, int ring_db) +{ + spin_lock_irq(&rnicp->lock); + idr_for_each(&rnicp->qpidr, enable_qp_db, + (void *)(unsigned long)ring_db); + spin_unlock_irq(&rnicp->lock); +} + +static void iwch_db_drop_task(struct work_struct *work) +{ + struct iwch_dev *rnicp = container_of(work, struct iwch_dev, + db_drop_task.work); + enable_dbs(rnicp, 1); +} + static void rnic_init(struct iwch_dev *rnicp) { PDBG("%s iwch_dev %p\n", __func__, rnicp); @@ -72,6 +112,7 @@ static void rnic_init(struct iwch_dev *rnicp) idr_init(&rnicp->qpidr); idr_init(&rnicp->mmidr); spin_lock_init(&rnicp->lock); + INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task); rnicp->attr.max_qps = T3_MAX_NUM_QP - 32; rnicp->attr.max_wrs = T3_MAX_QP_DEPTH; @@ -147,6 +188,7 @@ static void close_rnic_dev(struct t3cdev *tdev) mutex_lock(&dev_mutex); list_for_each_entry_safe(dev, tmp, &dev_list, entry) { if (dev->rdev.t3cdev_p == tdev) { + cancel_delayed_work_sync(&dev->db_drop_task); list_del(&dev->entry); iwch_unregister_device(dev); cxio_rdev_close(&dev->rdev); @@ -165,7 +207,8 @@ static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id) struct cxio_rdev *rdev = tdev->ulp; struct iwch_dev *rnicp; struct ib_event event; - u32 portnum = port_id + 1; + u32 portnum = port_id + 1; + int dispatch = 0; if (!rdev) return; @@ -174,21 +217,49 @@ static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id) case OFFLOAD_STATUS_DOWN: { rdev->flags = CXIO_ERROR_FATAL; event.event = IB_EVENT_DEVICE_FATAL; + dispatch = 1; break; } case OFFLOAD_PORT_DOWN: { event.event = IB_EVENT_PORT_ERR; + dispatch = 1; break; } case OFFLOAD_PORT_UP: { event.event = IB_EVENT_PORT_ACTIVE; + dispatch = 1; + break; + } + case OFFLOAD_DB_FULL: { + disable_dbs(rnicp); + break; + } + case OFFLOAD_DB_EMPTY: { + enable_dbs(rnicp, 1); + break; + } + case OFFLOAD_DB_DROP: { + unsigned long delay = 1000; + unsigned short r; + + disable_dbs(rnicp); + get_random_bytes(&r, 2); + delay += r & 1023; + + /* + * delay is between 1000-2023 usecs. + */ + schedule_delayed_work(&rnicp->db_drop_task, + usecs_to_jiffies(delay)); break; } } - event.device = &rnicp->ibdev; - event.element.port_num = portnum; - ib_dispatch_event(&event); + if (dispatch) { + event.device = &rnicp->ibdev; + event.element.port_num = portnum; + ib_dispatch_event(&event); + } return; } |