drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c - linux - Git at Google

 // 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-clt.h"
 #include "rtrs-log.h"

 #define MIN_MAX_RECONN_ATT -1
 #define MAX_MAX_RECONN_ATT 9999

 static void rtrs_clt_sess_release(struct kobject *kobj)
 {
 	struct rtrs_clt_sess *sess;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);

 	free_sess(sess);
 }

 static struct kobj_type ktype_sess = {
 	.sysfs_ops = &kobj_sysfs_ops,
 	.release = rtrs_clt_sess_release
 };

 static void rtrs_clt_sess_stats_release(struct kobject *kobj)
 {
 	struct rtrs_clt_stats *stats;

 	stats = container_of(kobj, struct rtrs_clt_stats, kobj_stats);

 	free_percpu(stats->pcpu_stats);

 	kfree(stats);
 }

 static struct kobj_type ktype_stats = {
 	.sysfs_ops = &kobj_sysfs_ops,
 	.release = rtrs_clt_sess_stats_release,
 };

 static ssize_t max_reconnect_attempts_show(struct device *dev,
 					   struct device_attribute *attr,
 					   char *page)
 {
 	struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev);

 	return sprintf(page, "%d\n", rtrs_clt_get_max_reconnect_attempts(clt));
 }

 static ssize_t max_reconnect_attempts_store(struct device *dev,
 					    struct device_attribute *attr,
 					    const char *buf,
 					    size_t count)
 {
 	int value;
 	int ret;
 	struct rtrs_clt *clt  = container_of(dev, struct rtrs_clt, dev);

 	ret = kstrtoint(buf, 10, &value);
 	if (ret) {
 		rtrs_err(clt, "%s: failed to convert string '%s' to int\n",
 			  attr->attr.name, buf);
 		return ret;
 	}
 	if (value > MAX_MAX_RECONN_ATT ||
 		     value < MIN_MAX_RECONN_ATT) {
 		rtrs_err(clt,
 			  "%s: invalid range (provided: '%s', accepted: min: %d, max: %d)\n",
 			  attr->attr.name, buf, MIN_MAX_RECONN_ATT,
 			  MAX_MAX_RECONN_ATT);
 		return -EINVAL;
 	}
 	rtrs_clt_set_max_reconnect_attempts(clt, value);

 	return count;
 }

 static DEVICE_ATTR_RW(max_reconnect_attempts);

 static ssize_t mpath_policy_show(struct device *dev,
 				 struct device_attribute *attr,
 				 char *page)
 {
 	struct rtrs_clt *clt;

 	clt = container_of(dev, struct rtrs_clt, dev);

 	switch (clt->mp_policy) {
 	case MP_POLICY_RR:
 		return sprintf(page, "round-robin (RR: %d)\n", clt->mp_policy);
 	case MP_POLICY_MIN_INFLIGHT:
 		return sprintf(page, "min-inflight (MI: %d)\n", clt->mp_policy);
 	default:
 		return sprintf(page, "Unknown (%d)\n", clt->mp_policy);
 	}
 }

 static ssize_t mpath_policy_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf,
 				  size_t count)
 {
 	struct rtrs_clt *clt;
 	int value;
 	int ret;

 	clt = container_of(dev, struct rtrs_clt, dev);

 	ret = kstrtoint(buf, 10, &value);
 	if (!ret && (value == MP_POLICY_RR ||
 		     value == MP_POLICY_MIN_INFLIGHT)) {
 		clt->mp_policy = value;
 		return count;
 	}

 	if (!strncasecmp(buf, "round-robin", 11) ||
 	    !strncasecmp(buf, "rr", 2))
 		clt->mp_policy = MP_POLICY_RR;
 	else if (!strncasecmp(buf, "min-inflight", 12) ||
 		 !strncasecmp(buf, "mi", 2))
 		clt->mp_policy = MP_POLICY_MIN_INFLIGHT;
 	else
 		return -EINVAL;

 	return count;
 }

 static DEVICE_ATTR_RW(mpath_policy);

 static ssize_t add_path_show(struct device *dev,
 			     struct device_attribute *attr, char *page)
 {
 	return scnprintf(page, PAGE_SIZE,
 			 "Usage: echo [<source addr>@]<destination addr> > %s\n\n*addr ::= [ ip:<ipv4|ipv6> | gid:<gid> ]\n",
 			 attr->attr.name);
 }

 static ssize_t add_path_store(struct device *dev,
 			      struct device_attribute *attr,
 			      const char *buf, size_t count)
 {
 	struct sockaddr_storage srcaddr, dstaddr;
 	struct rtrs_addr addr = {
 		.src = &srcaddr,
 		.dst = &dstaddr
 	};
 	struct rtrs_clt *clt;
 	const char *nl;
 	size_t len;
 	int err;

 	clt = container_of(dev, struct rtrs_clt, dev);

 	nl = strchr(buf, '\n');
 	if (nl)
 		len = nl - buf;
 	else
 		len = count;
 	err = rtrs_addr_to_sockaddr(buf, len, clt->port, &addr);
 	if (err)
 		return -EINVAL;

 	err = rtrs_clt_create_path_from_sysfs(clt, &addr);
 	if (err)
 		return err;

 	return count;
 }

 static DEVICE_ATTR_RW(add_path);

 static ssize_t rtrs_clt_state_show(struct kobject *kobj,
 				    struct kobj_attribute *attr, char *page)
 {
 	struct rtrs_clt_sess *sess;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
 	if (sess->state == RTRS_CLT_CONNECTED)
 		return sprintf(page, "connected\n");

 	return sprintf(page, "disconnected\n");
 }

 static struct kobj_attribute rtrs_clt_state_attr =
 	__ATTR(state, 0444, rtrs_clt_state_show, NULL);

 static ssize_t rtrs_clt_reconnect_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_clt_reconnect_store(struct kobject *kobj,
 					 struct kobj_attribute *attr,
 					 const char *buf, size_t count)
 {
 	struct rtrs_clt_sess *sess;
 	int ret;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
 	if (!sysfs_streq(buf, "1")) {
 		rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
 			  attr->attr.name, buf);
 		return -EINVAL;
 	}
 	ret = rtrs_clt_reconnect_from_sysfs(sess);
 	if (ret)
 		return ret;

 	return count;
 }

 static struct kobj_attribute rtrs_clt_reconnect_attr =
 	__ATTR(reconnect, 0644, rtrs_clt_reconnect_show,
 	       rtrs_clt_reconnect_store);

 static ssize_t rtrs_clt_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_clt_disconnect_store(struct kobject *kobj,
 					  struct kobj_attribute *attr,
 					  const char *buf, size_t count)
 {
 	struct rtrs_clt_sess *sess;
 	int ret;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
 	if (!sysfs_streq(buf, "1")) {
 		rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
 			  attr->attr.name, buf);
 		return -EINVAL;
 	}
 	ret = rtrs_clt_disconnect_from_sysfs(sess);
 	if (ret)
 		return ret;

 	return count;
 }

 static struct kobj_attribute rtrs_clt_disconnect_attr =
 	__ATTR(disconnect, 0644, rtrs_clt_disconnect_show,
 	       rtrs_clt_disconnect_store);

 static ssize_t rtrs_clt_remove_path_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_clt_remove_path_store(struct kobject *kobj,
 					   struct kobj_attribute *attr,
 					   const char *buf, size_t count)
 {
 	struct rtrs_clt_sess *sess;
 	int ret;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
 	if (!sysfs_streq(buf, "1")) {
 		rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
 			  attr->attr.name, buf);
 		return -EINVAL;
 	}
 	ret = rtrs_clt_remove_path_from_sysfs(sess, &attr->attr);
 	if (ret)
 		return ret;

 	return count;
 }

 static struct kobj_attribute rtrs_clt_remove_path_attr =
 	__ATTR(remove_path, 0644, rtrs_clt_remove_path_show,
 	       rtrs_clt_remove_path_store);

 STAT_ATTR(struct rtrs_clt_stats, cpu_migration,
 	  rtrs_clt_stats_migration_cnt_to_str,
 	  rtrs_clt_reset_cpu_migr_stats);

 STAT_ATTR(struct rtrs_clt_stats, reconnects,
 	  rtrs_clt_stats_reconnects_to_str,
 	  rtrs_clt_reset_reconnects_stat);

 STAT_ATTR(struct rtrs_clt_stats, rdma,
 	  rtrs_clt_stats_rdma_to_str,
 	  rtrs_clt_reset_rdma_stats);

 STAT_ATTR(struct rtrs_clt_stats, reset_all,
 	  rtrs_clt_reset_all_help,
 	  rtrs_clt_reset_all_stats);

 static struct attribute *rtrs_clt_stats_attrs[] = {
 	&cpu_migration_attr.attr,
 	&reconnects_attr.attr,
 	&rdma_attr.attr,
 	&reset_all_attr.attr,
 	NULL
 };

 static const struct attribute_group rtrs_clt_stats_attr_group = {
 	.attrs = rtrs_clt_stats_attrs,
 };

 static ssize_t rtrs_clt_hca_port_show(struct kobject *kobj,
 				       struct kobj_attribute *attr,
 				       char *page)
 {
 	struct rtrs_clt_sess *sess;

 	sess = container_of(kobj, typeof(*sess), kobj);

 	return scnprintf(page, PAGE_SIZE, "%u\n", sess->hca_port);
 }

 static struct kobj_attribute rtrs_clt_hca_port_attr =
 	__ATTR(hca_port, 0444, rtrs_clt_hca_port_show, NULL);

 static ssize_t rtrs_clt_hca_name_show(struct kobject *kobj,
 				       struct kobj_attribute *attr,
 				       char *page)
 {
 	struct rtrs_clt_sess *sess;

 	sess = container_of(kobj, struct rtrs_clt_sess, kobj);

 	return scnprintf(page, PAGE_SIZE, "%s\n", sess->hca_name);
 }

 static struct kobj_attribute rtrs_clt_hca_name_attr =
 	__ATTR(hca_name, 0444, rtrs_clt_hca_name_show, NULL);

 static ssize_t rtrs_clt_src_addr_show(struct kobject *kobj,
 				       struct kobj_attribute *attr,
 				       char *page)
 {
 	struct rtrs_clt_sess *sess;
 	int cnt;

 	sess = container_of(kobj, struct rtrs_clt_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_clt_src_addr_attr =
 	__ATTR(src_addr, 0444, rtrs_clt_src_addr_show, NULL);

 static ssize_t rtrs_clt_dst_addr_show(struct kobject *kobj,
 				       struct kobj_attribute *attr,
 				       char *page)
 {
 	struct rtrs_clt_sess *sess;
 	int cnt;

 	sess = container_of(kobj, struct rtrs_clt_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_clt_dst_addr_attr =
 	__ATTR(dst_addr, 0444, rtrs_clt_dst_addr_show, NULL);

 static struct attribute *rtrs_clt_sess_attrs[] = {
 	&rtrs_clt_hca_name_attr.attr,
 	&rtrs_clt_hca_port_attr.attr,
 	&rtrs_clt_src_addr_attr.attr,
 	&rtrs_clt_dst_addr_attr.attr,
 	&rtrs_clt_state_attr.attr,
 	&rtrs_clt_reconnect_attr.attr,
 	&rtrs_clt_disconnect_attr.attr,
 	&rtrs_clt_remove_path_attr.attr,
 	NULL,
 };

 static const struct attribute_group rtrs_clt_sess_attr_group = {
 	.attrs = rtrs_clt_sess_attrs,
 };

 int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess)
 {
 	struct rtrs_clt *clt = sess->clt;
 	char str[NAME_MAX];
 	int err, cnt;

 	cnt = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
 			      str, sizeof(str));
 	cnt += scnprintf(str + cnt, sizeof(str) - cnt, "@");
 	sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
 			str + cnt, sizeof(str) - cnt);

 	err = kobject_init_and_add(&sess->kobj, &ktype_sess, clt->kobj_paths,
 				   "%s", str);
 	if (err) {
 		pr_err("kobject_init_and_add: %d\n", err);
 		kobject_put(&sess->kobj);
 		return err;
 	}
 	err = sysfs_create_group(&sess->kobj, &rtrs_clt_sess_attr_group);
 	if (err) {
 		pr_err("sysfs_create_group(): %d\n", err);
 		goto put_kobj;
 	}
 	err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats,
 				   &sess->kobj, "stats");
 	if (err) {
 		pr_err("kobject_init_and_add: %d\n", err);
 		kobject_put(&sess->stats->kobj_stats);
 		goto remove_group;
 	}

 	err = sysfs_create_group(&sess->stats->kobj_stats,
 				 &rtrs_clt_stats_attr_group);
 	if (err) {
 		pr_err("failed to create stats sysfs group, err: %d\n", err);
 		goto put_kobj_stats;
 	}

 	return 0;

 put_kobj_stats:
 	kobject_del(&sess->stats->kobj_stats);
 	kobject_put(&sess->stats->kobj_stats);
 remove_group:
 	sysfs_remove_group(&sess->kobj, &rtrs_clt_sess_attr_group);
 put_kobj:
 	kobject_del(&sess->kobj);
 	kobject_put(&sess->kobj);

 	return err;
 }

 void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
 				  const struct attribute *sysfs_self)
 {
 	kobject_del(&sess->stats->kobj_stats);
 	kobject_put(&sess->stats->kobj_stats);
 	if (sysfs_self)
 		sysfs_remove_file_self(&sess->kobj, sysfs_self);
 	kobject_del(&sess->kobj);
 }

 static struct attribute *rtrs_clt_attrs[] = {
 	&dev_attr_max_reconnect_attempts.attr,
 	&dev_attr_mpath_policy.attr,
 	&dev_attr_add_path.attr,
 	NULL,
 };

 static const struct attribute_group rtrs_clt_attr_group = {
 	.attrs = rtrs_clt_attrs,
 };

 int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt)
 {
 	return sysfs_create_group(&clt->dev.kobj, &rtrs_clt_attr_group);
 }

 void rtrs_clt_destroy_sysfs_root_folders(struct rtrs_clt *clt)
 {
 	if (clt->kobj_paths) {
 		kobject_del(clt->kobj_paths);
 		kobject_put(clt->kobj_paths);
 	}
 }

 void rtrs_clt_destroy_sysfs_root_files(struct rtrs_clt *clt)
 {
 	sysfs_remove_group(&clt->dev.kobj, &rtrs_clt_attr_group);
 }
	// 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-clt.h"
	#include "rtrs-log.h"

	#define MIN_MAX_RECONN_ATT -1
	#define MAX_MAX_RECONN_ATT 9999

	static void rtrs_clt_sess_release(struct kobject *kobj)
	{
	struct rtrs_clt_sess *sess;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);

	free_sess(sess);
	}

	static struct kobj_type ktype_sess = {
	.sysfs_ops = &kobj_sysfs_ops,
	.release = rtrs_clt_sess_release
	};

	static void rtrs_clt_sess_stats_release(struct kobject *kobj)
	{
	struct rtrs_clt_stats *stats;

	stats = container_of(kobj, struct rtrs_clt_stats, kobj_stats);

	free_percpu(stats->pcpu_stats);

	kfree(stats);
	}

	static struct kobj_type ktype_stats = {
	.sysfs_ops = &kobj_sysfs_ops,
	.release = rtrs_clt_sess_stats_release,
	};

	static ssize_t max_reconnect_attempts_show(struct device *dev,
	struct device_attribute *attr,
	char *page)
	{
	struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev);

	return sprintf(page, "%d\n", rtrs_clt_get_max_reconnect_attempts(clt));
	}

	static ssize_t max_reconnect_attempts_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	int value;
	int ret;
	struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev);

	ret = kstrtoint(buf, 10, &value);
	if (ret) {
	rtrs_err(clt, "%s: failed to convert string '%s' to int\n",
	attr->attr.name, buf);
	return ret;
	}
	if (value > MAX_MAX_RECONN_ATT \|\|
	value < MIN_MAX_RECONN_ATT) {
	rtrs_err(clt,
	"%s: invalid range (provided: '%s', accepted: min: %d, max: %d)\n",
	attr->attr.name, buf, MIN_MAX_RECONN_ATT,
	MAX_MAX_RECONN_ATT);
	return -EINVAL;
	}
	rtrs_clt_set_max_reconnect_attempts(clt, value);

	return count;
	}

	static DEVICE_ATTR_RW(max_reconnect_attempts);

	static ssize_t mpath_policy_show(struct device *dev,
	struct device_attribute *attr,
	char *page)
	{
	struct rtrs_clt *clt;

	clt = container_of(dev, struct rtrs_clt, dev);

	switch (clt->mp_policy) {
	case MP_POLICY_RR:
	return sprintf(page, "round-robin (RR: %d)\n", clt->mp_policy);
	case MP_POLICY_MIN_INFLIGHT:
	return sprintf(page, "min-inflight (MI: %d)\n", clt->mp_policy);
	default:
	return sprintf(page, "Unknown (%d)\n", clt->mp_policy);
	}
	}

	static ssize_t mpath_policy_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct rtrs_clt *clt;
	int value;
	int ret;

	clt = container_of(dev, struct rtrs_clt, dev);

	ret = kstrtoint(buf, 10, &value);
	if (!ret && (value == MP_POLICY_RR \|\|
	value == MP_POLICY_MIN_INFLIGHT)) {
	clt->mp_policy = value;
	return count;
	}

	if (!strncasecmp(buf, "round-robin", 11) \|\|
	!strncasecmp(buf, "rr", 2))
	clt->mp_policy = MP_POLICY_RR;
	else if (!strncasecmp(buf, "min-inflight", 12) \|\|
	!strncasecmp(buf, "mi", 2))
	clt->mp_policy = MP_POLICY_MIN_INFLIGHT;
	else
	return -EINVAL;

	return count;
	}

	static DEVICE_ATTR_RW(mpath_policy);

	static ssize_t add_path_show(struct device *dev,
	struct device_attribute attr, char page)
	{
	return scnprintf(page, PAGE_SIZE,
	"Usage: echo [<source addr>@]<destination addr> > %s\n\n*addr ::= [ ip:<ipv4\|ipv6> \| gid:<gid> ]\n",
	attr->attr.name);
	}

	static ssize_t add_path_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct sockaddr_storage srcaddr, dstaddr;
	struct rtrs_addr addr = {
	.src = &srcaddr,
	.dst = &dstaddr
	};
	struct rtrs_clt *clt;
	const char *nl;
	size_t len;
	int err;

	clt = container_of(dev, struct rtrs_clt, dev);

	nl = strchr(buf, '\n');
	if (nl)
	len = nl - buf;
	else
	len = count;
	err = rtrs_addr_to_sockaddr(buf, len, clt->port, &addr);
	if (err)
	return -EINVAL;

	err = rtrs_clt_create_path_from_sysfs(clt, &addr);
	if (err)
	return err;

	return count;
	}

	static DEVICE_ATTR_RW(add_path);

	static ssize_t rtrs_clt_state_show(struct kobject *kobj,
	struct kobj_attribute attr, char page)
	{
	struct rtrs_clt_sess *sess;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
	if (sess->state == RTRS_CLT_CONNECTED)
	return sprintf(page, "connected\n");

	return sprintf(page, "disconnected\n");
	}

	static struct kobj_attribute rtrs_clt_state_attr =
	__ATTR(state, 0444, rtrs_clt_state_show, NULL);

	static ssize_t rtrs_clt_reconnect_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_clt_reconnect_store(struct kobject *kobj,
	struct kobj_attribute *attr,
	const char *buf, size_t count)
	{
	struct rtrs_clt_sess *sess;
	int ret;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
	if (!sysfs_streq(buf, "1")) {
	rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
	attr->attr.name, buf);
	return -EINVAL;
	}
	ret = rtrs_clt_reconnect_from_sysfs(sess);
	if (ret)
	return ret;

	return count;
	}

	static struct kobj_attribute rtrs_clt_reconnect_attr =
	__ATTR(reconnect, 0644, rtrs_clt_reconnect_show,
	rtrs_clt_reconnect_store);

	static ssize_t rtrs_clt_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_clt_disconnect_store(struct kobject *kobj,
	struct kobj_attribute *attr,
	const char *buf, size_t count)
	{
	struct rtrs_clt_sess *sess;
	int ret;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
	if (!sysfs_streq(buf, "1")) {
	rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
	attr->attr.name, buf);
	return -EINVAL;
	}
	ret = rtrs_clt_disconnect_from_sysfs(sess);
	if (ret)
	return ret;

	return count;
	}

	static struct kobj_attribute rtrs_clt_disconnect_attr =
	__ATTR(disconnect, 0644, rtrs_clt_disconnect_show,
	rtrs_clt_disconnect_store);

	static ssize_t rtrs_clt_remove_path_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_clt_remove_path_store(struct kobject *kobj,
	struct kobj_attribute *attr,
	const char *buf, size_t count)
	{
	struct rtrs_clt_sess *sess;
	int ret;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);
	if (!sysfs_streq(buf, "1")) {
	rtrs_err(sess->clt, "%s: unknown value: '%s'\n",
	attr->attr.name, buf);
	return -EINVAL;
	}
	ret = rtrs_clt_remove_path_from_sysfs(sess, &attr->attr);
	if (ret)
	return ret;

	return count;
	}

	static struct kobj_attribute rtrs_clt_remove_path_attr =
	__ATTR(remove_path, 0644, rtrs_clt_remove_path_show,
	rtrs_clt_remove_path_store);

	STAT_ATTR(struct rtrs_clt_stats, cpu_migration,
	rtrs_clt_stats_migration_cnt_to_str,
	rtrs_clt_reset_cpu_migr_stats);

	STAT_ATTR(struct rtrs_clt_stats, reconnects,
	rtrs_clt_stats_reconnects_to_str,
	rtrs_clt_reset_reconnects_stat);

	STAT_ATTR(struct rtrs_clt_stats, rdma,
	rtrs_clt_stats_rdma_to_str,
	rtrs_clt_reset_rdma_stats);

	STAT_ATTR(struct rtrs_clt_stats, reset_all,
	rtrs_clt_reset_all_help,
	rtrs_clt_reset_all_stats);

	static struct attribute *rtrs_clt_stats_attrs[] = {
	&cpu_migration_attr.attr,
	&reconnects_attr.attr,
	&rdma_attr.attr,
	&reset_all_attr.attr,
	NULL
	};

	static const struct attribute_group rtrs_clt_stats_attr_group = {
	.attrs = rtrs_clt_stats_attrs,
	};

	static ssize_t rtrs_clt_hca_port_show(struct kobject *kobj,
	struct kobj_attribute *attr,
	char *page)
	{
	struct rtrs_clt_sess *sess;

	sess = container_of(kobj, typeof(*sess), kobj);

	return scnprintf(page, PAGE_SIZE, "%u\n", sess->hca_port);
	}

	static struct kobj_attribute rtrs_clt_hca_port_attr =
	__ATTR(hca_port, 0444, rtrs_clt_hca_port_show, NULL);

	static ssize_t rtrs_clt_hca_name_show(struct kobject *kobj,
	struct kobj_attribute *attr,
	char *page)
	{
	struct rtrs_clt_sess *sess;

	sess = container_of(kobj, struct rtrs_clt_sess, kobj);

	return scnprintf(page, PAGE_SIZE, "%s\n", sess->hca_name);
	}

	static struct kobj_attribute rtrs_clt_hca_name_attr =
	__ATTR(hca_name, 0444, rtrs_clt_hca_name_show, NULL);

	static ssize_t rtrs_clt_src_addr_show(struct kobject *kobj,
	struct kobj_attribute *attr,
	char *page)
	{
	struct rtrs_clt_sess *sess;
	int cnt;

	sess = container_of(kobj, struct rtrs_clt_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_clt_src_addr_attr =
	__ATTR(src_addr, 0444, rtrs_clt_src_addr_show, NULL);

	static ssize_t rtrs_clt_dst_addr_show(struct kobject *kobj,
	struct kobj_attribute *attr,
	char *page)
	{
	struct rtrs_clt_sess *sess;
	int cnt;

	sess = container_of(kobj, struct rtrs_clt_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_clt_dst_addr_attr =
	__ATTR(dst_addr, 0444, rtrs_clt_dst_addr_show, NULL);

	static struct attribute *rtrs_clt_sess_attrs[] = {
	&rtrs_clt_hca_name_attr.attr,
	&rtrs_clt_hca_port_attr.attr,
	&rtrs_clt_src_addr_attr.attr,
	&rtrs_clt_dst_addr_attr.attr,
	&rtrs_clt_state_attr.attr,
	&rtrs_clt_reconnect_attr.attr,
	&rtrs_clt_disconnect_attr.attr,
	&rtrs_clt_remove_path_attr.attr,
	NULL,
	};

	static const struct attribute_group rtrs_clt_sess_attr_group = {
	.attrs = rtrs_clt_sess_attrs,
	};

	int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess)
	{
	struct rtrs_clt *clt = sess->clt;
	char str[NAME_MAX];
	int err, cnt;

	cnt = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
	str, sizeof(str));
	cnt += scnprintf(str + cnt, sizeof(str) - cnt, "@");
	sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
	str + cnt, sizeof(str) - cnt);

	err = kobject_init_and_add(&sess->kobj, &ktype_sess, clt->kobj_paths,
	"%s", str);
	if (err) {
	pr_err("kobject_init_and_add: %d\n", err);
	kobject_put(&sess->kobj);
	return err;
	}
	err = sysfs_create_group(&sess->kobj, &rtrs_clt_sess_attr_group);
	if (err) {
	pr_err("sysfs_create_group(): %d\n", err);
	goto put_kobj;
	}
	err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats,
	&sess->kobj, "stats");
	if (err) {
	pr_err("kobject_init_and_add: %d\n", err);
	kobject_put(&sess->stats->kobj_stats);
	goto remove_group;
	}

	err = sysfs_create_group(&sess->stats->kobj_stats,
	&rtrs_clt_stats_attr_group);
	if (err) {
	pr_err("failed to create stats sysfs group, err: %d\n", err);
	goto put_kobj_stats;
	}

	return 0;

	put_kobj_stats:
	kobject_del(&sess->stats->kobj_stats);
	kobject_put(&sess->stats->kobj_stats);
	remove_group:
	sysfs_remove_group(&sess->kobj, &rtrs_clt_sess_attr_group);
	put_kobj:
	kobject_del(&sess->kobj);
	kobject_put(&sess->kobj);

	return err;
	}

	void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
	const struct attribute *sysfs_self)
	{
	kobject_del(&sess->stats->kobj_stats);
	kobject_put(&sess->stats->kobj_stats);
	if (sysfs_self)
	sysfs_remove_file_self(&sess->kobj, sysfs_self);
	kobject_del(&sess->kobj);
	}

	static struct attribute *rtrs_clt_attrs[] = {
	&dev_attr_max_reconnect_attempts.attr,
	&dev_attr_mpath_policy.attr,
	&dev_attr_add_path.attr,
	NULL,
	};

	static const struct attribute_group rtrs_clt_attr_group = {
	.attrs = rtrs_clt_attrs,
	};

	int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt)
	{
	return sysfs_create_group(&clt->dev.kobj, &rtrs_clt_attr_group);
	}

	void rtrs_clt_destroy_sysfs_root_folders(struct rtrs_clt *clt)
	{
	if (clt->kobj_paths) {
	kobject_del(clt->kobj_paths);
	kobject_put(clt->kobj_paths);
	}
	}

	void rtrs_clt_destroy_sysfs_root_files(struct rtrs_clt *clt)
	{
	sysfs_remove_group(&clt->dev.kobj, &rtrs_clt_attr_group);
	}