RDMA/core: Add iterator over ib_devices

The coming nldev needs to iterate over all IB devices in the system
and in order to not expose the ib_devices list outside the devices.c,
it is necessary to provide function iterator.

Current version is written explicitly for nldev callback to avoid
over-engineering at this stage, but it can be easily extended for
other types.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>

diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index e759c27..0c17559 100644 (file)
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -102,6 +102,14 @@ void ib_enum_all_roce_netdevs(roce_netdev_filter filter,
                              roce_netdev_callback cb,
                              void *cookie);
 
+typedef int (*nldev_callback)(struct ib_device *device,
+                             struct sk_buff *skb,
+                             struct netlink_callback *cb,
+                             unsigned int idx);
+
+int ib_enum_all_devs(nldev_callback nldev_cb, struct sk_buff *skb,
+                    struct netlink_callback *cb);
+
 enum ib_cache_gid_default_mode {
        IB_CACHE_GID_DEFAULT_MODE_SET,
        IB_CACHE_GID_DEFAULT_MODE_DELETE

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 33a3951..8828f26 100644 (file)
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -893,6 +893,31 @@ void ib_enum_all_roce_netdevs(roce_netdev_filter filter,
 }
 
 /**
+ * ib_enum_all_devs - enumerate all ib_devices
+ * @cb: Callback to call for each found ib_device
+ *
+ * Enumerates all ib_devices and calls callback() on each device.
+ */
+int ib_enum_all_devs(nldev_callback nldev_cb, struct sk_buff *skb,
+                    struct netlink_callback *cb)
+{
+       struct ib_device *dev;
+       unsigned int idx = 0;
+       int ret = 0;
+
+       down_read(&lists_rwsem);
+       list_for_each_entry(dev, &device_list, core_list) {
+               ret = nldev_cb(dev, skb, cb, idx);
+               if (ret)
+                       break;
+               idx++;
+       }
+
+       up_read(&lists_rwsem);
+       return ret;
+}
+
+/**
  * ib_query_pkey - Get P_Key table entry
  * @device:Device to query
  * @port_num:Port number to query