diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index fa6dc870adae..364d4b6937f5 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -282,6 +282,8 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		props->sig_guard_cap = IB_GUARD_T10DIF_CRC |
 				       IB_GUARD_T10DIF_CSUM;
 	}
+	if (flags & MLX5_DEV_CAP_FLAG_BLOCK_MCAST)
+		props->device_cap_flags |= IB_DEVICE_BLOCK_MULTICAST_LOOPBACK;
 
 	props->vendor_id	   = be32_to_cpup((__be32 *)(out_mad->data + 36)) &
 		0xffffff;
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index ae788d27b93f..dc930ed21eca 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -807,6 +807,15 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
 	spin_lock_init(&qp->sq.lock);
 	spin_lock_init(&qp->rq.lock);
 
+	if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) {
+		if (!(dev->mdev.caps.flags & MLX5_DEV_CAP_FLAG_BLOCK_MCAST)) {
+			mlx5_ib_dbg(dev, "block multicast loopback isn't supported\n");
+			return -EINVAL;
+		} else {
+			qp->flags |= MLX5_IB_QP_BLOCK_MULTICAST_LOOPBACK;
+		}
+	}
+
 	if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
 		qp->sq_signal_bits = MLX5_WQE_CTRL_CQ_UPDATE;
 
@@ -878,6 +887,9 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
 	if (qp->wq_sig)
 		in->ctx.flags_pd |= cpu_to_be32(MLX5_QP_ENABLE_SIG);
 
+	if (qp->flags & MLX5_IB_QP_BLOCK_MULTICAST_LOOPBACK)
+		in->ctx.flags_pd |= cpu_to_be32(MLX5_QP_BLOCK_MCAST);
+
 	if (qp->scat_cqe && is_connected(init_attr->qp_type)) {
 		int rcqe_sz;
 		int scqe_sz;
diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index 87897b95666d..ded76c101dde 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -858,13 +858,9 @@ static int mthca_enable_msi_x(struct mthca_dev *mdev)
 	entries[1].entry = 1;
 	entries[2].entry = 2;
 
-	err = pci_enable_msix(mdev->pdev, entries, ARRAY_SIZE(entries));
-	if (err) {
-		if (err > 0)
-			mthca_info(mdev, "Only %d MSI-X vectors available, "
-				   "not using MSI-X\n", err);
+	err = pci_enable_msix_exact(mdev->pdev, entries, ARRAY_SIZE(entries));
+	if (err)
 		return err;
-	}
 
 	mdev->eq_table.eq[MTHCA_EQ_COMP ].msi_x_vector = entries[0].vector;
 	mdev->eq_table.eq[MTHCA_EQ_ASYNC].msi_x_vector = entries[1].vector;
diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c
index c8d9c4ab142b..61a0046efb76 100644
--- a/drivers/infiniband/hw/qib/qib_pcie.c
+++ b/drivers/infiniband/hw/qib/qib_pcie.c
@@ -197,46 +197,47 @@ static void qib_msix_setup(struct qib_devdata *dd, int pos, u32 *msixcnt,
 			   struct qib_msix_entry *qib_msix_entry)
 {
 	int ret;
-	u32 tabsize = 0;
-	u16 msix_flags;
+	int nvec = *msixcnt;
 	struct msix_entry *msix_entry;
 	int i;
 
+	ret = pci_msix_vec_count(dd->pcidev);
+	if (ret < 0)
+		goto do_intx;
+
+	nvec = min(nvec, ret);
+
 	/* We can't pass qib_msix_entry array to qib_msix_setup
 	 * so use a dummy msix_entry array and copy the allocated
 	 * irq back to the qib_msix_entry array. */
-	msix_entry = kmalloc(*msixcnt * sizeof(*msix_entry), GFP_KERNEL);
-	if (!msix_entry) {
-		ret = -ENOMEM;
+	msix_entry = kmalloc(nvec * sizeof(*msix_entry), GFP_KERNEL);
+	if (!msix_entry)
 		goto do_intx;
-	}
-	for (i = 0; i < *msixcnt; i++)
+
+	for (i = 0; i < nvec; i++)
 		msix_entry[i] = qib_msix_entry[i].msix;
 
-	pci_read_config_word(dd->pcidev, pos + PCI_MSIX_FLAGS, &msix_flags);
-	tabsize = 1 + (msix_flags & PCI_MSIX_FLAGS_QSIZE);
-	if (tabsize > *msixcnt)
-		tabsize = *msixcnt;
-	ret = pci_enable_msix(dd->pcidev, msix_entry, tabsize);
-	if (ret > 0) {
-		tabsize = ret;
-		ret = pci_enable_msix(dd->pcidev, msix_entry, tabsize);
-	}
-do_intx:
-	if (ret) {
-		qib_dev_err(dd,
-			"pci_enable_msix %d vectors failed: %d, falling back to INTx\n",
-			tabsize, ret);
-		tabsize = 0;
-	}
-	for (i = 0; i < tabsize; i++)
+	ret = pci_enable_msix_range(dd->pcidev, msix_entry, 1, nvec);
+	if (ret < 0)
+		goto free_msix_entry;
+	else
+		nvec = ret;
+
+	for (i = 0; i < nvec; i++)
 		qib_msix_entry[i].msix = msix_entry[i];
+
 	kfree(msix_entry);
-	*msixcnt = tabsize;
+	*msixcnt = nvec;
+	return;
 
-	if (ret)
-		qib_enable_intx(dd->pcidev);
+free_msix_entry:
+	kfree(msix_entry);
 
+do_intx:
+	qib_dev_err(dd, "pci_enable_msix_range %d vectors failed: %d, "
+			"falling back to INTx\n", nvec, ret);
+	*msixcnt = 0;
+	qib_enable_intx(dd->pcidev);
 }
 
 /**
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 407bdb67fd4f..3406cfb1267a 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -179,6 +179,7 @@ enum {
 	MLX5_DEV_CAP_FLAG_BAD_QKEY_CNTR	= 1LL <<  9,
 	MLX5_DEV_CAP_FLAG_APM		= 1LL << 17,
 	MLX5_DEV_CAP_FLAG_ATOMIC	= 1LL << 18,
+	MLX5_DEV_CAP_FLAG_BLOCK_MCAST	= 1LL << 23,
 	MLX5_DEV_CAP_FLAG_ON_DMND_PG	= 1LL << 24,
 	MLX5_DEV_CAP_FLAG_CQ_MODER	= 1LL << 29,
 	MLX5_DEV_CAP_FLAG_RESIZE_CQ	= 1LL << 30,
diff --git a/include/linux/mlx5/qp.h b/include/linux/mlx5/qp.h
index f829ad80ff28..9709b30e2d69 100644
--- a/include/linux/mlx5/qp.h
+++ b/include/linux/mlx5/qp.h
@@ -146,6 +146,7 @@ enum {
 
 enum {
 	MLX5_QP_LAT_SENSITIVE	= 1 << 28,
+	MLX5_QP_BLOCK_MCAST	= 1 << 30,
 	MLX5_QP_ENABLE_SIG	= 1 << 31,
 };