[ofa-general] RE: [PATCH RFC] rds: add iwarp support

[Sean Hefty]

>+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);

You should be able to use either rdma_resolve_addr or rdma_bind_addr (if this is
a local address) to get what you need.  Alternately, look at the ib_addr module
for lower-level calls.

- Sean