Commit 215378b8 authored by Jack Wang's avatar Jack Wang Committed by Jason Gunthorpe

RDMA/rtrs: client: sysfs interface functions

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

  /sys/class/rtrs-client/<SESS-NAME>/
    *** rtrs session created by rtrs_clt_open() API call
    |
    |- max_reconnect_attempts
    |  *** number of reconnect attempts for session
    |
    |- add_path
    |  *** adds another connection path into rtrs session
    |
    |- paths/<SRC@DST>/
       *** established paths to server in a session
       |
       |- disconnect
       |  *** disconnect path
       |
       |- reconnect
       |  *** reconnect path
       |
       |- remove_path
       |  *** remove current path
       |
       |- state
       |  *** retrieve current path state
       |
       |- hca_port
       |  *** HCA port number
       |
       |- hca_name
       |  *** HCA name
       |
       |- stats/
          *** current path statistics
          |
	  |- cpu_migration
	  |- rdma
	  |- reconnects
	  |- reset_all

Link: https://lore.kernel.org/r/20200511135131.27580-9-danil.kipnis@cloud.ionos.comSigned-off-by: default avatarDanil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: default avatarJack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 89dd4c3b
// 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);
}
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