[PATCH rdma-next 06/10] IB/core: Enable to query QP types supported by IB device on a port

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Add qp_type_cap port attribute which is a bit field representation
of the ib_qp_type enum. This will allow applications to query what QP
types are supported by an IB device instance on a specific port.

The qp_type_cap port attribute is set by the core according to the
protocol supported for the device port. This holds for all the
providers with the exception of two RoCE drivers that don't implement
UD and UC. To handle that, they (hns and qedr) are patched to remove
these QPs from what's the core has set for them as supported.

Signed-off-by: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/infiniband/core/device.c          | 28 ++++++++++++++++++++++++++++
 drivers/infiniband/hw/hns/hns_roce_main.c |  3 +++
 drivers/infiniband/hw/qedr/verbs.c        |  2 ++
 include/rdma/ib_verbs.h                   |  1 +
 4 files changed, 34 insertions(+)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 760ef60..f7abde2 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -646,6 +646,31 @@ void ib_dispatch_event(struct ib_event *event)
 }
 EXPORT_SYMBOL(ib_dispatch_event);
 
+static void get_port_qp_types(const struct ib_device *device, u8 port_num,
+			      struct ib_port_attr *port_attr)
+{
+	if (rdma_cap_ib_smi(device, port_num))
+		port_attr->qp_type_cap |= BIT(IB_QPT_SMI);
+
+	if (rdma_cap_ib_cm(device, port_num))
+		port_attr->qp_type_cap |= BIT(IB_QPT_GSI);
+
+	if (rdma_ib_or_roce(device, port_num)) {
+		port_attr->qp_type_cap |= (BIT(IB_QPT_RC) | BIT(IB_QPT_UD) | BIT(IB_QPT_UC));
+		if (device->attrs.device_cap_flags & IB_DEVICE_XRC)
+			port_attr->qp_type_cap |= (BIT(IB_QPT_XRC_INI) | BIT(IB_QPT_XRC_TGT));
+	}
+
+	if (rdma_protocol_iwarp(device, port_num))
+		port_attr->qp_type_cap |= BIT(IB_QPT_RC);
+
+	if (rdma_protocol_raw_packet(device, port_num))
+		port_attr->qp_type_cap |= BIT(IB_QPT_RAW_PACKET);
+
+	if (rdma_protocol_usnic(device, port_num))
+		port_attr->qp_type_cap |= BIT(IB_QPT_UD);
+}
+
 /**
  * ib_query_port - Query IB port attributes
  * @device:Device to query
@@ -666,6 +691,9 @@ int ib_query_port(struct ib_device *device,
 		return -EINVAL;
 
 	memset(port_attr, 0, sizeof(*port_attr));
+
+	get_port_qp_types(device, port_num, port_attr);
+
 	err = device->query_port(device, port_num, port_attr);
 	if (err || port_attr->subnet_prefix)
 		return err;
diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index c6b5779..22de534 100644
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -430,6 +430,9 @@ static int hns_roce_query_port(struct ib_device *ib_dev, u8 port_num,
 			IB_PORT_ACTIVE : IB_PORT_DOWN;
 	props->phys_state = (props->state == IB_PORT_ACTIVE) ? 5 : 3;
 
+	/* mark that UD and UC aren't supported */
+	props->qp_type_cap &= ~(BIT(IB_QPT_UD) | BIT(IB_QPT_UC));
+
 	spin_unlock_irqrestore(&hr_dev->iboe.lock, flags);
 
 	return 0;
diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index 53207ff..33d0219 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -263,6 +263,8 @@ int qedr_query_port(struct ib_device *ibdev, u8 port, struct ib_port_attr *attr)
 	attr->max_msg_sz = rdma_port->max_msg_size;
 	attr->max_vl_num = 4;
 
+	/* mark that UD and UC aren't supported */
+	attr->qp_type_cap &= ~(BIT(IB_QPT_UD) | BIT(IB_QPT_UC));
 	return 0;
 }
 
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 485b725..0b839e4 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -536,6 +536,7 @@ struct ib_port_attr {
 	u8			active_speed;
 	u8                      phys_state;
 	bool			grh_required;
+	u16			qp_type_cap;
 };
 
 enum ib_device_modify_flags {
-- 
2.7.4

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