Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (48 commits)
  IB/srp: Clean up error path in srp_create_target_ib()
  IB/srp: Split send and recieve CQs to reduce number of interrupts
  RDMA/nes: Add support for KR device id 0x0110
  IB/uverbs: Use anon_inodes instead of private infinibandeventfs
  IB/core: Fix and clean up ib_ud_header_init()
  RDMA/cxgb3: Mark RDMA device with CXIO_ERROR_FATAL when removing
  RDMA/cxgb3: Don't allocate the SW queue for user mode CQs
  RDMA/cxgb3: Increase the max CQ depth
  RDMA/cxgb3: Doorbell overflow avoidance and recovery
  IB/core: Pack struct ib_device a little tighter
  IB/ucm: Clean whitespace errors
  IB/ucm: Increase maximum devices supported
  IB/ucm: Use stack variable 'base' in ib_ucm_add_one
  IB/ucm: Use stack variable 'devnum' in ib_ucm_add_one
  IB/umad: Clean whitespace
  IB/umad: Increase maximum devices supported
  IB/umad: Use stack variable 'base' in ib_umad_init_port
  IB/umad: Use stack variable 'devnum' in ib_umad_init_port
  IB/umad: Remove port_table[]
  IB/umad: Convert *cdev to cdev in struct ib_umad_port
  ...

7 files changed, 110 insertions, 19 deletions

diff --git a/drivers/infiniband/hw/cxgb3/cxio_hal.c b/drivers/infiniband/hw/cxgb3/cxio_hal.c
index 0677fc7..a28e862 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_hal.c
+++ b/drivers/infiniband/hw/cxgb3/cxio_hal.c
@@ -109,7 +109,6 @@ int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
 		while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
 			udelay(1);
 			if (i++ > 1000000) {
-				BUG_ON(1);
 				printk(KERN_ERR "%s: stalled rnic\n",
 				       rdev_p->dev_name);
 				return -EIO;
@@ -155,7 +154,7 @@ static int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
 	return iwch_cxgb3_ofld_send(rdev_p->t3cdev_p, skb);
 }
 
-int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
+int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq, int kernel)
 {
 	struct rdma_cq_setup setup;
 	int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
@@ -163,12 +162,12 @@ int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 	cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
 	if (!cq->cqid)
 		return -ENOMEM;
-	cq->sw_queue = kzalloc(size, GFP_KERNEL);
-	if (!cq->sw_queue)
-		return -ENOMEM;
-	cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
-					     (1UL << (cq->size_log2)) *
-					     sizeof(struct t3_cqe),
+	if (kernel) {
+		cq->sw_queue = kzalloc(size, GFP_KERNEL);
+		if (!cq->sw_queue)
+			return -ENOMEM;
+	}
+	cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev), size,
 					     &(cq->dma_addr), GFP_KERNEL);
 	if (!cq->queue) {
 		kfree(cq->sw_queue);
diff --git a/drivers/infiniband/hw/cxgb3/cxio_hal.h b/drivers/infiniband/hw/cxgb3/cxio_hal.h
index f3d440c..073373c 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_hal.h
+++ b/drivers/infiniband/hw/cxgb3/cxio_hal.h
@@ -53,7 +53,7 @@
 #define T3_MAX_PBL_SIZE 256
 #define T3_MAX_RQ_SIZE 1024
 #define T3_MAX_QP_DEPTH (T3_MAX_RQ_SIZE-1)
-#define T3_MAX_CQ_DEPTH 8192
+#define T3_MAX_CQ_DEPTH 262144
 #define T3_MAX_NUM_STAG (1<<15)
 #define T3_MAX_MR_SIZE 0x100000000ULL
 #define T3_PAGESIZE_MASK 0xffff000  /* 4KB-128MB */
@@ -157,7 +157,7 @@ int cxio_rdev_open(struct cxio_rdev *rdev);
 void cxio_rdev_close(struct cxio_rdev *rdev);
 int cxio_hal_cq_op(struct cxio_rdev *rdev, struct t3_cq *cq,
 		   enum t3_cq_opcode op, u32 credit);
-int cxio_create_cq(struct cxio_rdev *rdev, struct t3_cq *cq);
+int cxio_create_cq(struct cxio_rdev *rdev, struct t3_cq *cq, int kernel);
 int cxio_destroy_cq(struct cxio_rdev *rdev, struct t3_cq *cq);
 int cxio_resize_cq(struct cxio_rdev *rdev, struct t3_cq *cq);
 void cxio_release_ucontext(struct cxio_rdev *rdev, struct cxio_ucontext *uctx);
diff --git a/drivers/infiniband/hw/cxgb3/cxio_wr.h b/drivers/infiniband/hw/cxgb3/cxio_wr.h
index a197a5b..15073b2 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_wr.h
+++ b/drivers/infiniband/hw/cxgb3/cxio_wr.h
@@ -730,7 +730,22 @@ struct t3_cq {
 
 static inline void cxio_set_wq_in_error(struct t3_wq *wq)
 {
-	wq->queue->wq_in_err.err = 1;
+	wq->queue->wq_in_err.err |= 1;
+}
+
+static inline void cxio_disable_wq_db(struct t3_wq *wq)
+{
+	wq->queue->wq_in_err.err |= 2;
+}
+
+static inline void cxio_enable_wq_db(struct t3_wq *wq)
+{
+	wq->queue->wq_in_err.err &= ~2;
+}
+
+static inline int cxio_wq_db_enabled(struct t3_wq *wq)
+{
+	return !(wq->queue->wq_in_err.err & 2);
 }
 
 static inline struct t3_cqe *cxio_next_hw_cqe(struct t3_cq *cq)
diff --git a/drivers/infiniband/hw/cxgb3/iwch.c b/drivers/infiniband/hw/cxgb3/iwch.c
index b0ea010..ee1d8b4 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 +188,8 @@ 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) {
+			dev->rdev.flags = CXIO_ERROR_FATAL;
+			cancel_delayed_work_sync(&dev->db_drop_task);
 			list_del(&dev->entry);
 			iwch_unregister_device(dev);
 			cxio_rdev_close(&dev->rdev);
@@ -165,7 +208,8 @@ 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 +218,49 @@ 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;
 }
diff --git a/drivers/infiniband/hw/cxgb3/iwch.h b/drivers/infiniband/hw/cxgb3/iwch.h
index 8473550..a1c4457 100644
--- a/drivers/infiniband/hw/cxgb3/iwch.h
+++ b/drivers/infiniband/hw/cxgb3/iwch.h
@@ -36,6 +36,7 @@
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/idr.h>
+#include <linux/workqueue.h>
 
 #include <rdma/ib_verbs.h>
 
@@ -110,6 +111,7 @@ struct iwch_dev {
 	struct idr mmidr;
 	spinlock_t lock;
 	struct list_head entry;
+	struct delayed_work db_drop_task;
 };
 
 static inline struct iwch_dev *to_iwch_dev(struct ib_device *ibdev)
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index ed71755..47b35c6 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -187,7 +187,7 @@ static struct ib_cq *iwch_create_cq(struct ib_device *ibdev, int entries, int ve
 	entries = roundup_pow_of_two(entries);
 	chp->cq.size_log2 = ilog2(entries);
 
-	if (cxio_create_cq(&rhp->rdev, &chp->cq)) {
+	if (cxio_create_cq(&rhp->rdev, &chp->cq, !ucontext)) {
 		kfree(chp);
 		return ERR_PTR(-ENOMEM);
 	}
diff --git a/drivers/infiniband/hw/cxgb3/iwch_qp.c b/drivers/infiniband/hw/cxgb3/iwch_qp.c
index 3eb8cec..b4d893d 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_qp.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_qp.c
@@ -452,7 +452,8 @@ int iwch_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 		++(qhp->wq.sq_wptr);
 	}
 	spin_unlock_irqrestore(&qhp->lock, flag);
-	ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
+	if (cxio_wq_db_enabled(&qhp->wq))
+		ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 
 out:
 	if (err)
@@ -514,7 +515,8 @@ int iwch_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 		num_wrs--;
 	}
 	spin_unlock_irqrestore(&qhp->lock, flag);
-	ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
+	if (cxio_wq_db_enabled(&qhp->wq))
+		ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 
 out:
 	if (err)
@@ -597,7 +599,8 @@ int iwch_bind_mw(struct ib_qp *qp,
 	++(qhp->wq.sq_wptr);
 	spin_unlock_irqrestore(&qhp->lock, flag);
 
-	ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
+	if (cxio_wq_db_enabled(&qhp->wq))
+		ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 
 	return err;
 }