RDMA/rtrs: client: sysfs interface functions

// 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 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 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);

		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);

		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 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);

}