[PATCH v7 12/25] RDMA/rtrs: server: sysfs interface functions

Jack Wang
2020-01-16T12:59:40Z

From: Jack Wang <jinpu.wang@cloud.ionos.com>

This is the sysfs interface to rtrs sessions on server side:

/sys/devices/virtual/rtrs-server/<SESS-NAME>/
*** rtrs session accepted from a client peer
|
|- paths/<SRC@DST>/
*** established paths from a client in a session
|
|- disconnect
| *** disconnect path
|
|- hca_name
| *** HCA name
|
|- hca_port
| *** HCA port
|
|- stats/
*** current path statistics
|
|- rdma
|- reset_all
|- wc_completions

Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c | 297 +++++++++++++++++++
1 file changed, 297 insertions(+)
create mode 100644 drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c

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 000000000000..6cce4e5a0c82
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c
@@ -0,0 +1,297 @@
+// 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 struct kobj_type ktype = {
+ .sysfs_ops = &kobj_sysfs_ops,
+};
+
+static ssize_t rtrs_srv_disconnect_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *page)
+{
+ return scnprintf(page, PAGE_SIZE, "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_sess *sess;
+ struct rtrs_sess *s;
+ char str[MAXHOSTNAMELEN];
+
+ sess = container_of(kobj, struct rtrs_srv_sess, kobj);
+ s = &sess->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 *)&sess->s.dst_addr, str, sizeof(str));
+
+ rtrs_info(s, "disconnect for path %s requested\n", str);
+ close_sess(sess);
+
+ 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_sess *sess;
+ struct rtrs_con *usr_con;
+
+ sess = container_of(kobj, typeof(*sess), kobj);
+ usr_con = sess->s.con[0];
+
+ return scnprintf(page, PAGE_SIZE, "%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_sess *sess;
+
+ sess = container_of(kobj, struct rtrs_srv_sess, kobj);
+
+ return scnprintf(page, PAGE_SIZE, "%s\n",
+ sess->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_sess *sess;
+ int cnt;
+
+ sess = container_of(kobj, struct rtrs_srv_sess, kobj);
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
+ page, PAGE_SIZE);
+ return cnt + scnprintf(page + cnt, PAGE_SIZE - 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_sess *sess;
+ int cnt;
+
+ sess = container_of(kobj, struct rtrs_srv_sess, kobj);
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
+ page, PAGE_SIZE);
+ return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n");
+}
+
+static struct kobj_attribute rtrs_srv_dst_addr_attr =
+ __ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL);
+
+static struct attribute *rtrs_srv_sess_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 struct attribute_group rtrs_srv_sess_attr_group = {
+ .attrs = rtrs_srv_sess_attrs,
+};
+
+STAT_ATTR(struct rtrs_srv_sess, rdma,
+ rtrs_srv_stats_rdma_to_str,
+ rtrs_srv_reset_rdma_stats);
+
+STAT_ATTR(struct rtrs_srv_sess, wc_completion,
+ rtrs_srv_stats_wc_completion_to_str,
+ rtrs_srv_reset_wc_completion_stats);
+
+STAT_ATTR(struct rtrs_srv_sess, reset_all,
+ rtrs_srv_reset_all_help,
+ rtrs_srv_reset_all_stats);
+
+static struct attribute *rtrs_srv_stats_attrs[] = {
+ &rdma_attr.attr,
+ &wc_completion_attr.attr,
+ &reset_all_attr.attr,
+ NULL,
+};
+
+static struct attribute_group rtrs_srv_stats_attr_group = {
+ .attrs = rtrs_srv_stats_attrs,
+};
+
+static void rtrs_srv_dev_release(struct device *dev)
+{
+ struct rtrs_srv *srv = container_of(dev, struct rtrs_srv, dev);
+
+ kfree(srv);
+}
+
+static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ int err = 0;
+
+ mutex_lock(&srv->paths_mutex);
+ if (srv->dev_ref++) {
+ /*
+ * Just increase device reference. We can't use get_device()
+ * because we need to unregister device when ref goes to 0,
+ * not just to put it.
+ */
+ goto unlock;
+ }
+ srv->dev.class = rtrs_dev_class;
+ srv->dev.release = rtrs_srv_dev_release;
+ dev_set_name(&srv->dev, "%s", sess->s.sessname);
+
+ err = device_register(&srv->dev);
+ if (unlikely(err)) {
+ pr_err("device_register(): %d\n", err);
+ goto unlock;
+ }
+ err = kobject_init_and_add(&srv->kobj_paths, &ktype,
+ &srv->dev.kobj, "paths");
+ if (unlikely(err)) {
+ pr_err("kobject_init_and_add(): %d\n", err);
+ device_unregister(&srv->dev);
+ goto unlock;
+ }
+unlock:
+ mutex_unlock(&srv->paths_mutex);
+
+ return err;
+}
+
+static void
+rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+
+ mutex_lock(&srv->paths_mutex);
+ if (!--srv->dev_ref) {
+ kobject_del(&srv->kobj_paths);
+ kobject_put(&srv->kobj_paths);
+ device_unregister(&srv->dev);
+ }
+ mutex_unlock(&srv->paths_mutex);
+}
+
+static int rtrs_srv_create_stats_files(struct rtrs_srv_sess *sess)
+{
+ int err;
+ struct rtrs_sess *s = &sess->s;
+
+ err = kobject_init_and_add(&sess->kobj_stats, &ktype,
+ &sess->kobj, "stats");
+ if (unlikely(err)) {
+ rtrs_err(s, "kobject_init_and_add(): %d\n", err);
+ return err;
+ }
+ err = sysfs_create_group(&sess->kobj_stats,
+ &rtrs_srv_stats_attr_group);
+ if (unlikely(err)) {
+ rtrs_err(s, "sysfs_create_group(): %d\n", err);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ kobject_del(&sess->kobj_stats);
+ kobject_put(&sess->kobj_stats);
+
+ return err;
+}
+
+int rtrs_srv_create_sess_files(struct rtrs_srv_sess *sess)
+{
+ struct rtrs_srv *srv = sess->srv;
+ struct rtrs_sess *s = &sess->s;
+ char str[NAME_MAX];
+ int err, cnt;
+
+ cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
+ str, sizeof(str));
+ cnt += scnprintf(str + cnt, sizeof(str) - cnt, "@");
+ sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
+ str + cnt, sizeof(str) - cnt);
+
+ err = rtrs_srv_create_once_sysfs_root_folders(sess);
+ if (unlikely(err))
+ return err;
+
+ err = kobject_init_and_add(&sess->kobj, &ktype, &srv->kobj_paths,
+ "%s", str);
+ if (unlikely(err)) {
+ rtrs_err(s, "kobject_init_and_add(): %d\n", err);
+ goto destroy_root;
+ }
+ err = sysfs_create_group(&sess->kobj, &rtrs_srv_sess_attr_group);
+ if (unlikely(err)) {
+ rtrs_err(s, "sysfs_create_group(): %d\n", err);
+ goto put_kobj;
+ }
+ err = rtrs_srv_create_stats_files(sess);
+ if (unlikely(err))
+ goto remove_group;
+
+ return 0;
+
+remove_group:
+ sysfs_remove_group(&sess->kobj, &rtrs_srv_sess_attr_group);
+put_kobj:
+ kobject_del(&sess->kobj);
+ kobject_put(&sess->kobj);
+destroy_root:
+ rtrs_srv_destroy_once_sysfs_root_folders(sess);
+
+ return err;
+}
+
+void rtrs_srv_destroy_sess_files(struct rtrs_srv_sess *sess)
+{
+ if (sess->kobj.state_in_sysfs) {
+ kobject_del(&sess->kobj_stats);
+ kobject_put(&sess->kobj_stats);
+ kobject_del(&sess->kobj);
+ kobject_put(&sess->kobj);
+
+ rtrs_srv_destroy_once_sysfs_root_folders(sess);
+ }
+}
--
2.17.1