1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
new file mode 100644
index 0000000000..3f305e694f
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
@@ -0,0 +1,319 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RDMA Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
+
+#include "rtrs-pri.h"
+#include "rtrs-srv.h"
+#include "rtrs-log.h"
+
+static void rtrs_srv_release(struct kobject *kobj)
+{
+	struct rtrs_srv_path *srv_path;
+
+	srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
+	kfree(srv_path);
+}
+
+static struct kobj_type ktype = {
+	.sysfs_ops	= &kobj_sysfs_ops,
+	.release	= rtrs_srv_release,
+};
+
+static ssize_t rtrs_srv_disconnect_show(struct kobject *kobj,
+					struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name);
+}
+
+static ssize_t rtrs_srv_disconnect_store(struct kobject *kobj,
+					  struct kobj_attribute *attr,
+					  const char *buf, size_t count)
+{
+	struct rtrs_srv_path *srv_path;
+	struct rtrs_path *s;
+	char str[MAXHOSTNAMELEN];
+
+	srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
+	s = &srv_path->s;
+	if (!sysfs_streq(buf, "1")) {
+		rtrs_err(s, "%s: invalid value: '%s'\n",
+			  attr->attr.name, buf);
+		return -EINVAL;
+	}
+
+	sockaddr_to_str((struct sockaddr *)&srv_path->s.dst_addr, str,
+			sizeof(str));
+
+	rtrs_info(s, "disconnect for path %s requested\n", str);
+	/* first remove sysfs itself to avoid deadlock */
+	sysfs_remove_file_self(&srv_path->kobj, &attr->attr);
+	close_path(srv_path);
+
+	return count;
+}
+
+static struct kobj_attribute rtrs_srv_disconnect_attr =
+	__ATTR(disconnect, 0644,
+	       rtrs_srv_disconnect_show, rtrs_srv_disconnect_store);
+
+static ssize_t rtrs_srv_hca_port_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct rtrs_srv_path *srv_path;
+	struct rtrs_con *usr_con;
+
+	srv_path = container_of(kobj, typeof(*srv_path), kobj);
+	usr_con = srv_path->s.con[0];
+
+	return sysfs_emit(page, "%u\n", usr_con->cm_id->port_num);
+}
+
+static struct kobj_attribute rtrs_srv_hca_port_attr =
+	__ATTR(hca_port, 0444, rtrs_srv_hca_port_show, NULL);
+
+static ssize_t rtrs_srv_hca_name_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct rtrs_srv_path *srv_path;
+
+	srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
+
+	return sysfs_emit(page, "%s\n", srv_path->s.dev->ib_dev->name);
+}
+
+static struct kobj_attribute rtrs_srv_hca_name_attr =
+	__ATTR(hca_name, 0444, rtrs_srv_hca_name_show, NULL);
+
+static ssize_t rtrs_srv_src_addr_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct rtrs_srv_path *srv_path;
+	int cnt;
+
+	srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
+	cnt = sockaddr_to_str((struct sockaddr *)&srv_path->s.dst_addr,
+			      page, PAGE_SIZE);
+	return cnt + sysfs_emit_at(page, cnt, "\n");
+}
+
+static struct kobj_attribute rtrs_srv_src_addr_attr =
+	__ATTR(src_addr, 0444, rtrs_srv_src_addr_show, NULL);
+
+static ssize_t rtrs_srv_dst_addr_show(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       char *page)
+{
+	struct rtrs_srv_path *srv_path;
+	int len;
+
+	srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
+	len = sockaddr_to_str((struct sockaddr *)&srv_path->s.src_addr, page,
+			      PAGE_SIZE);
+	len += sysfs_emit_at(page, len, "\n");
+	return len;
+}
+
+static struct kobj_attribute rtrs_srv_dst_addr_attr =
+	__ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL);
+
+static struct attribute *rtrs_srv_path_attrs[] = {
+	&rtrs_srv_hca_name_attr.attr,
+	&rtrs_srv_hca_port_attr.attr,
+	&rtrs_srv_src_addr_attr.attr,
+	&rtrs_srv_dst_addr_attr.attr,
+	&rtrs_srv_disconnect_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group rtrs_srv_path_attr_group = {
+	.attrs = rtrs_srv_path_attrs,
+};
+
+STAT_ATTR(struct rtrs_srv_stats, rdma,
+	  rtrs_srv_stats_rdma_to_str,
+	  rtrs_srv_reset_rdma_stats);
+
+static struct attribute *rtrs_srv_stats_attrs[] = {
+	&rdma_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group rtrs_srv_stats_attr_group = {
+	.attrs = rtrs_srv_stats_attrs,
+};
+
+static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)
+{
+	struct rtrs_srv_sess *srv = srv_path->srv;
+	int err = 0;
+
+	mutex_lock(&srv->paths_mutex);
+	if (srv->dev_ref++) {
+		/*
+		 * Device needs to be registered only on the first session
+		 */
+		goto unlock;
+	}
+	srv->dev.class = &rtrs_dev_class;
+	err = dev_set_name(&srv->dev, "%s", srv_path->s.sessname);
+	if (err)
+		goto unlock;
+
+	/*
+	 * Suppress user space notification until
+	 * sysfs files are created
+	 */
+	dev_set_uevent_suppress(&srv->dev, true);
+	err = device_add(&srv->dev);
+	if (err) {
+		pr_err("device_add(): %d\n", err);
+		put_device(&srv->dev);
+		goto unlock;
+	}
+	srv->kobj_paths = kobject_create_and_add("paths", &srv->dev.kobj);
+	if (!srv->kobj_paths) {
+		err = -ENOMEM;
+		pr_err("kobject_create_and_add(): %d\n", err);
+		device_del(&srv->dev);
+		put_device(&srv->dev);
+		goto unlock;
+	}
+	dev_set_uevent_suppress(&srv->dev, false);
+	kobject_uevent(&srv->dev.kobj, KOBJ_ADD);
+unlock:
+	mutex_unlock(&srv->paths_mutex);
+
+	return err;
+}
+
+static void
+rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)
+{
+	struct rtrs_srv_sess *srv = srv_path->srv;
+
+	mutex_lock(&srv->paths_mutex);
+	if (!--srv->dev_ref) {
+		kobject_put(srv->kobj_paths);
+		mutex_unlock(&srv->paths_mutex);
+		device_del(&srv->dev);
+		put_device(&srv->dev);
+	} else {
+		put_device(&srv->dev);
+		mutex_unlock(&srv->paths_mutex);
+	}
+}
+
+static void rtrs_srv_path_stats_release(struct kobject *kobj)
+{
+	struct rtrs_srv_stats *stats;
+
+	stats = container_of(kobj, struct rtrs_srv_stats, kobj_stats);
+
+	free_percpu(stats->rdma_stats);
+
+	kfree(stats);
+}
+
+static struct kobj_type ktype_stats = {
+	.sysfs_ops = &kobj_sysfs_ops,
+	.release = rtrs_srv_path_stats_release,
+};
+
+static int rtrs_srv_create_stats_files(struct rtrs_srv_path *srv_path)
+{
+	int err;
+	struct rtrs_path *s = &srv_path->s;
+
+	err = kobject_init_and_add(&srv_path->stats->kobj_stats, &ktype_stats,
+				   &srv_path->kobj, "stats");
+	if (err) {
+		rtrs_err(s, "kobject_init_and_add(): %d\n", err);
+		kobject_put(&srv_path->stats->kobj_stats);
+		return err;
+	}
+	err = sysfs_create_group(&srv_path->stats->kobj_stats,
+				 &rtrs_srv_stats_attr_group);
+	if (err) {
+		rtrs_err(s, "sysfs_create_group(): %d\n", err);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	kobject_del(&srv_path->stats->kobj_stats);
+	kobject_put(&srv_path->stats->kobj_stats);
+
+	return err;
+}
+
+int rtrs_srv_create_path_files(struct rtrs_srv_path *srv_path)
+{
+	struct rtrs_srv_sess *srv = srv_path->srv;
+	struct rtrs_path *s = &srv_path->s;
+	char str[NAME_MAX];
+	int err;
+	struct rtrs_addr path = {
+		.src = &srv_path->s.dst_addr,
+		.dst = &srv_path->s.src_addr,
+	};
+
+	rtrs_addr_to_str(&path, str, sizeof(str));
+	err = rtrs_srv_create_once_sysfs_root_folders(srv_path);
+	if (err)
+		return err;
+
+	err = kobject_init_and_add(&srv_path->kobj, &ktype, srv->kobj_paths,
+				   "%s", str);
+	if (err) {
+		rtrs_err(s, "kobject_init_and_add(): %d\n", err);
+		goto destroy_root;
+	}
+	err = sysfs_create_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
+	if (err) {
+		rtrs_err(s, "sysfs_create_group(): %d\n", err);
+		goto put_kobj;
+	}
+	err = rtrs_srv_create_stats_files(srv_path);
+	if (err)
+		goto remove_group;
+
+	return 0;
+
+remove_group:
+	sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
+put_kobj:
+	kobject_del(&srv_path->kobj);
+destroy_root:
+	kobject_put(&srv_path->kobj);
+	rtrs_srv_destroy_once_sysfs_root_folders(srv_path);
+
+	return err;
+}
+
+void rtrs_srv_destroy_path_files(struct rtrs_srv_path *srv_path)
+{
+	if (srv_path->stats->kobj_stats.state_in_sysfs) {
+		sysfs_remove_group(&srv_path->stats->kobj_stats,
+				   &rtrs_srv_stats_attr_group);
+		kobject_del(&srv_path->stats->kobj_stats);
+		kobject_put(&srv_path->stats->kobj_stats);
+	}
+
+	if (srv_path->kobj.state_in_sysfs) {
+		sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
+		kobject_put(&srv_path->kobj);
+		rtrs_srv_destroy_once_sysfs_root_folders(srv_path);
+	}
+
+}