diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 0751697..0c5028a 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -36,6 +36,7 @@
#include <linux/random.h>
#include <linux/idr.h>
#include <linux/inetdevice.h>
+#include <linux/if_arp.h>
#include <net/tcp.h>
@@ -200,6 +201,43 @@ struct sdp_hah {
#define CMA_VERSION 0x00
#define SDP_MAJ_VERSION 0x2
+struct ib_device *ipaddr_to_ibdev(u32 addr)
+{
+ struct rdma_dev_addr dev_addr;
+ struct cma_device *cma_dev;
+ struct net_device *dev;
+ union ib_gid gid;
+
+ dev = ip_dev_find(addr);
+ if (!dev)
+ goto out;
+
+ rdma_copy_addr(&dev_addr, dev, NULL);
+
+ switch (dev->type) {
+ case ARPHRD_INFINIBAND:
+ ib_addr_get_sgid(&dev_addr, &gid);
+ break;
+ case ARPHRD_ETHER:
+ iw_addr_get_sgid(&dev_addr, &gid);
+ break;
+ default:
+ goto out;
+ }
+
+ list_for_each_entry(cma_dev, &dev_list, list) {
+ int ret;
+ u8 port;
+
+ ret = ib_find_cached_gid(cma_dev->device, &gid, &port, NULL);
+ if (!ret)
+ return cma_dev->device;
+ }
+out:
+ return NULL;
+}
+EXPORT_SYMBOL(ipaddr_to_ibdev);
+
static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
{
unsigned long flags;
Pending our discussion on whether this service will even survive, there
is a bug in it. Function ip_dev_find() keeps a reference on the netdev.
So before returning, this function should do a dev_put(dev) to release
the reference...
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