fabtests/loopback: Add new test that talks with itself

This test communicates with itself.  No need for client/server
setup.  This tests provider support for loopback communication.

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

fabtests/Makefile.am

@@ -44,6 +44,7 @@ bin_PROGRAMS = \
 	functional/fi_multi_recv \
 	functional/fi_bw \
 	functional/fi_rdm_multi_client \
+	functional/fi_loopback \
 	benchmarks/fi_msg_pingpong \
 	benchmarks/fi_msg_bw \
 	benchmarks/fi_rma_bw \
@@ -262,6 +263,10 @@ functional_fi_rdm_multi_client_SOURCES = \
 	functional/rdm_multi_client.c
 functional_fi_rdm_multi_client_LDADD = libfabtests.la
 
+functional_fi_loopback_SOURCES = \
+	functional/loopback.c
+functional_fi_loopback_LDADD = libfabtests.la
+
 benchmarks_fi_msg_pingpong_SOURCES = \
 	benchmarks/msg_pingpong.c \
 	$(benchmarks_srcs)

fabtests/functional/loopback.c

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2021 Intel Corporation.  All rights reserved.
+ *
+ * This software is available to you under the BSD license
+ * below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <unistd.h>
+
+#include <shared.h>
+
+
+static int run(void)
+{
+	int ret;
+
+	ret = ft_getinfo(hints, &fi);
+	if (ret)
+		return ret;
+
+	ret = ft_open_fabric_res();
+	if (ret)
+		return ret;
+
+	ret = ft_alloc_active_res(fi);
+	if (ret)
+		return ret;
+
+	ret = ft_enable_ep_recv();
+	if (ret)
+		return ret;
+
+	opts.dst_addr = fi->src_addr;
+	fi->dest_addr = fi->src_addr;
+	fi->dest_addrlen = fi->src_addrlen;
+
+	ret = ft_init_av();
+	if (ret)
+		goto out;
+
+	ret = ft_send_greeting(ep);
+	if (ret)
+		goto out;
+
+	ret = ft_recv_greeting(ep);
+	if (ret)
+		goto out;
+
+out:
+	fi->dest_addr = NULL;
+	fi->dest_addrlen = 0;
+	return ret;
+}
+
+int main(int argc, char **argv)
+{
+	int op, ret;
+
+	opts = INIT_OPTS;
+
+	hints = fi_allocinfo();
+	if (!hints)
+		return EXIT_FAILURE;
+
+	hints->caps |= FI_LOCAL_COMM;
+	hints->ep_attr->type = FI_EP_RDM;
+
+	while ((op = getopt(argc, argv, "h" INFO_OPTS)) != -1) {
+		switch (op) {
+		default:
+			ft_parseinfo(op, optarg, hints, &opts);
+			break;
+		case '?':
+		case 'h':
+			ft_usage(argv[0], "A loopback communication test.");
+			return EXIT_FAILURE;
+		}
+	}
+
+	hints->caps = FI_MSG;
+	hints->mode = FI_CONTEXT;
+	hints->domain_attr->mr_mode = opts.mr_mode;
+
+	ret = run();
+
+	ft_free_res();
+	return ft_exit_code(ret);
+}