[RFC PATCH 06/11] IB/Verbs: Use management helper has_sa() and cap_sa(), for sa-check

[Michael Wang <yun.wang-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>]

Introduce helper has_sa() and cap_sa() to help us check if an IB device
or it's port support Subnet Administrator.

Cc: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Michael Wang <yun.wang-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
---
 drivers/infiniband/core/sa_query.c | 12 ++++++------
 include/rdma/ib_verbs.h            | 28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index d95d25f..89c27da 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -450,7 +450,7 @@ static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event
         struct ib_sa_port *port =
             &sa_dev->port[event->element.port_num - sa_dev->start_port];
 
-        if (!rdma_port_ll_is_ib(handler->device, port->port_num))
+        if (!cap_sa(handler->device, port->port_num))
             return;
 
         spin_lock_irqsave(&port->ah_lock, flags);
@@ -1154,7 +1154,7 @@ static void ib_sa_add_one(struct ib_device *device)
     struct ib_sa_device *sa_dev;
     int s, e, i;
 
-    if (!rdma_transport_is_ib(device))
+    if (!has_sa(device))
         return;
 
     if (device->node_type == RDMA_NODE_IB_SWITCH)
@@ -1175,7 +1175,7 @@ static void ib_sa_add_one(struct ib_device *device)
 
     for (i = 0; i <= e - s; ++i) {
         spin_lock_init(&sa_dev->port[i].ah_lock);
-        if (!rdma_port_ll_is_ib(device, i + 1))
+        if (!cap_sa(device, i + 1))
             continue;
 
         sa_dev->port[i].sm_ah    = NULL;
@@ -1205,14 +1205,14 @@ static void ib_sa_add_one(struct ib_device *device)
         goto err;
 
     for (i = 0; i <= e - s; ++i)
-        if (rdma_port_ll_is_ib(device, i + 1))
+        if (cap_sa(device, i + 1))
             update_sm_ah(&sa_dev->port[i].update_task);
 
     return;
 
 err:
     while (--i >= 0)
-        if (rdma_port_ll_is_ib(device, i + 1))
+        if (cap_sa(device, i + 1))
             ib_unregister_mad_agent(sa_dev->port[i].agent);
 
     kfree(sa_dev);
@@ -1233,7 +1233,7 @@ static void ib_sa_remove_one(struct ib_device *device)
     flush_workqueue(ib_wq);
 
     for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
-        if (rdma_port_ll_is_ib(device, i + 1)) {
+        if (cap_sa(device, i + 1)) {
             ib_unregister_mad_agent(sa_dev->port[i].agent);
             if (sa_dev->port[i].sm_ah)
                 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index c0a63f8..fa8ffa3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1810,6 +1810,19 @@ static inline int has_cm(struct ib_device *device)
 }
 
 /**
+ * has_sa - Check if a device support Subnet Administrator.
+ *
+ * @device: Device to be checked
+ *
+ * Return 0 when a device has none port to support
+ * Subnet Administrator.
+ */
+static inline int has_sa(struct ib_device *device)
+{
+    return rdma_transport_is_ib(device);
+}
+
+/**
  * cap_smi - Check if the port of device has the capability
  * Subnet Management Interface.
  *
@@ -1824,6 +1837,21 @@ static inline int cap_smi(struct ib_device *device, u8 port_num)
     return rdma_port_ll_is_ib(device, port_num);
 }
 
+/**
+ * cap_sa - Check if the port of device has the capability
+ * Subnet Administrator.
+ *
+ * @device: Device to be checked
+ * @port_num: Port number of the device
+ *
+ * Return 0 when port of the device don't support
+ * Subnet Administrator.
+ */
+static inline int cap_sa(struct ib_device *device, u8 port_num)
+{
+    return rdma_port_ll_is_ib(device, port_num);
+}
+
 int ib_query_gid(struct ib_device *device,
          u8 port_num, int index, union ib_gid *gid);
 
-- 
2.1.0

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