From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
This patch adds static device index in similar fashion to
already available in netdev world (struct net->ifindex).
In downstream patches, the RDMA nelink will use this idx-to-ib_device
conversion, so as part of this commit, we are exposing the translation
function to be visible for IB/core users.
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/core_priv.h | 4 ++++
drivers/infiniband/core/device.c | 37 ++++++++++++++++++++++++++++++++++++-
include/rdma/ib_verbs.h | 2 ++
3 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index 4a150c4be175..291cae284771 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -184,4 +184,8 @@ int ib_nl_handle_set_timeout(struct sk_buff *skb,
int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
struct netlink_callback *cb);
+struct ib_device *__ib_device_get_by_index(u32 ifindex);
+/* RDMA device netlink */
+void nldev_init(void);
+void nldev_exit(void);
#endif /* _CORE_PRIV_H */
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 7a799fc90348..7ff65d766d86 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -124,6 +124,17 @@ static int ib_device_check_mandatory(struct ib_device *device)
return 0;
}
+struct ib_device *__ib_device_get_by_index(u32 index)
+{
+ struct ib_device *device;
+
+ list_for_each_entry(device, &device_list, core_list)
+ if (device->index == index)
+ return device;
+
+ return NULL;
+}
+
static struct ib_device *__ib_device_get_by_name(const char *name)
{
struct ib_device *device;
@@ -135,7 +146,6 @@ static struct ib_device *__ib_device_get_by_name(const char *name)
return NULL;
}
-
static int alloc_name(char *name)
{
unsigned long *inuse;
@@ -326,6 +336,30 @@ void ib_get_device_fw_str(struct ib_device *dev, char *str, size_t str_len)
EXPORT_SYMBOL(ib_get_device_fw_str);
/**
+ * __dev_new_index - allocate an device index
+ *
+ * Returns a suitable unique value for a new device interface
+ * number. It assumes that there are less than 2^32-1 ib devices
+ * will be present in the system.
+ */
+static u32 __dev_new_index(void)
+{
+ /*
+ * The device index to allow stable naming.
+ * Similar to struct net -> ifindex.
+ */
+ static u32 index;
+
+ for (;;) {
+ if (!(++index))
+ index = 1;
+
+ if (!__ib_device_get_by_index(index))
+ return index;
+ }
+}
+
+/**
* ib_register_device - Register an IB device with IB core
* @device:Device to register
*
@@ -417,6 +451,7 @@ int ib_register_device(struct ib_device *device,
if (client->add && !add_client_context(device, client))
client->add(device);
+ device->index = __dev_new_index();
down_write(&lists_rwsem);
list_add_tail(&device->core_list, &device_list);
up_write(&lists_rwsem);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ba8314ec5768..b73120727d60 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2237,6 +2237,8 @@ struct ib_device {
struct rdmacg_device cg_device;
#endif
+ u32 index;
+
/**
* The following mandatory functions are used only at device
* registration. Keep functions such as these at the end of this
--
2.13.1
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