fabric: Define new FI_DUP control code

This will be used to duplicate an fid_nic structure.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>

include/rdma/fabric.h

@@ -579,6 +579,7 @@ enum {
 	FI_CANCEL_WORK,		/* struct fi_deferred_work */
 	FI_FLUSH_WORK,		/* NULL */
 	FI_REFRESH,		/* mr: fi_mr_modify */
+	FI_DUP,			/* struct fid ** */
 };
 
 static inline int fi_control(struct fid *fid, int command, void *arg)

src/fabric.c

@@ -512,9 +512,23 @@ int ofi_nic_close(struct fid *fid)
 	return 0;
 }
 
+int ofi_nic_control(struct fid *fid, int command, void *arg)
+{
+	struct fid_nic **nic = (struct fid_nic **) arg;
+
+	switch(command) {
+	case FI_DUP:
+		*nic = ofi_nic_dup(*nic);
+		return *nic ? 0 : -FI_ENOMEM;
+	default:
+		return -FI_ENOSYS;
+	}
+}
+
 struct fi_ops default_nic_ops = {
 	.size = sizeof(struct fi_ops),
 	.close = ofi_nic_close,
+	.control = ofi_nic_control,
 };
 
 static int ofi_dup_dev_attr(const struct fi_device_attr *attr,
@@ -880,6 +894,7 @@ __attribute__((visibility ("default"),EXTERNALLY_VISIBLE))
 struct fi_info *DEFAULT_SYMVER_PRE(fi_dupinfo)(const struct fi_info *info)
 {
 	struct fi_info *dup;
+	struct fid *handle;
 
 	if (!info)
 		return ofi_allocinfo_internal();
@@ -967,6 +982,13 @@ struct fi_info *DEFAULT_SYMVER_PRE(fi_dupinfo)(const struct fi_info *info)
 				goto fail;
 		}
 	}
+
+	if (info->handle && info->handle->ops && info->handle->ops->control) {
+		handle = info->handle;
+		if (fi_control(handle, FI_DUP, &handle))
+			goto fail;
+		dup->handle = handle;
+	}
 	return dup;
 
 fail: