drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * RDMA Transport Layer
   4  *
   5  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
   6  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
   7  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
   8  */
   9 #undef pr_fmt
  10 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
  11
  12 #include "rtrs-pri.h"
  13 #include "rtrs-srv.h"
  14 #include "rtrs-log.h"
  15
  16 static void rtrs_srv_release(struct kobject *kobj)
  17 {
  18         struct rtrs_srv_sess *sess;
  19
  20         sess = container_of(kobj, struct rtrs_srv_sess, kobj);
  21         kfree(sess);
  22 }
  23
  24 static struct kobj_type ktype = {
  25         .sysfs_ops      = &kobj_sysfs_ops,
  26         .release        = rtrs_srv_release,
  27 };
  28
  29 static ssize_t rtrs_srv_disconnect_show(struct kobject *kobj,
  30                                         struct kobj_attribute *attr, char *buf)
  31 {
  32         return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name);
  33 }
  34
  35 static ssize_t rtrs_srv_disconnect_store(struct kobject *kobj,
  36                                           struct kobj_attribute *attr,
  37                                           const char *buf, size_t count)
  38 {
  39         struct rtrs_srv_sess *sess;
  40         struct rtrs_sess *s;
  41         char str[MAXHOSTNAMELEN];
  42
  43         sess = container_of(kobj, struct rtrs_srv_sess, kobj);
  44         s = &sess->s;
  45         if (!sysfs_streq(buf, "1")) {
  46                 rtrs_err(s, "%s: invalid value: '%s'\n",
  47                           attr->attr.name, buf);
  48                 return -EINVAL;
  49         }
  50
  51         sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr, str, sizeof(str));
  52
  53         rtrs_info(s, "disconnect for path %s requested\n", str);
  54         close_sess(sess);
  55
  56         return count;
  57 }
  58
  59 static struct kobj_attribute rtrs_srv_disconnect_attr =
  60         __ATTR(disconnect, 0644,
  61                rtrs_srv_disconnect_show, rtrs_srv_disconnect_store);
  62
  63 static ssize_t rtrs_srv_hca_port_show(struct kobject *kobj,
  64                                        struct kobj_attribute *attr,
  65                                        char *page)
  66 {
  67         struct rtrs_srv_sess *sess;
  68         struct rtrs_con *usr_con;
  69
  70         sess = container_of(kobj, typeof(*sess), kobj);
  71         usr_con = sess->s.con[0];
  72
  73         return sysfs_emit(page, "%u\n", usr_con->cm_id->port_num);
  74 }
  75
  76 static struct kobj_attribute rtrs_srv_hca_port_attr =
  77         __ATTR(hca_port, 0444, rtrs_srv_hca_port_show, NULL);
  78
  79 static ssize_t rtrs_srv_hca_name_show(struct kobject *kobj,
  80                                        struct kobj_attribute *attr,
  81                                        char *page)
  82 {
  83         struct rtrs_srv_sess *sess;
  84
  85         sess = container_of(kobj, struct rtrs_srv_sess, kobj);
  86
  87         return sysfs_emit(page, "%s\n", sess->s.dev->ib_dev->name);
  88 }
  89
  90 static struct kobj_attribute rtrs_srv_hca_name_attr =
  91         __ATTR(hca_name, 0444, rtrs_srv_hca_name_show, NULL);
  92
  93 static ssize_t rtrs_srv_src_addr_show(struct kobject *kobj,
  94                                        struct kobj_attribute *attr,
  95                                        char *page)
  96 {
  97         struct rtrs_srv_sess *sess;
  98         int cnt;
  99
 100         sess = container_of(kobj, struct rtrs_srv_sess, kobj);
 101         cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
 102                               page, PAGE_SIZE);
 103         return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n");
 104 }
 105
 106 static struct kobj_attribute rtrs_srv_src_addr_attr =
 107         __ATTR(src_addr, 0444, rtrs_srv_src_addr_show, NULL);
 108
 109 static ssize_t rtrs_srv_dst_addr_show(struct kobject *kobj,
 110                                        struct kobj_attribute *attr,
 111                                        char *page)
 112 {
 113         struct rtrs_srv_sess *sess;
 114         int len;
 115
 116         sess = container_of(kobj, struct rtrs_srv_sess, kobj);
 117         len = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr, page,
 118                               PAGE_SIZE);
 119         len += sysfs_emit_at(page, len, "\n");
 120         return len;
 121 }
 122
 123 static struct kobj_attribute rtrs_srv_dst_addr_attr =
 124         __ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL);
 125
 126 static struct attribute *rtrs_srv_sess_attrs[] = {
 127         &rtrs_srv_hca_name_attr.attr,
 128         &rtrs_srv_hca_port_attr.attr,
 129         &rtrs_srv_src_addr_attr.attr,
 130         &rtrs_srv_dst_addr_attr.attr,
 131         &rtrs_srv_disconnect_attr.attr,
 132         NULL,
 133 };
 134
 135 static const struct attribute_group rtrs_srv_sess_attr_group = {
 136         .attrs = rtrs_srv_sess_attrs,
 137 };
 138
 139 STAT_ATTR(struct rtrs_srv_stats, rdma,
 140           rtrs_srv_stats_rdma_to_str,
 141           rtrs_srv_reset_rdma_stats);
 142
 143 static struct attribute *rtrs_srv_stats_attrs[] = {
 144         &rdma_attr.attr,
 145         NULL,
 146 };
 147
 148 static const struct attribute_group rtrs_srv_stats_attr_group = {
 149         .attrs = rtrs_srv_stats_attrs,
 150 };
 151
 152 static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
 153 {
 154         struct rtrs_srv *srv = sess->srv;
 155         int err = 0;
 156
 157         mutex_lock(&srv->paths_mutex);
 158         if (srv->dev_ref++) {
 159                 /*
 160                  * Device needs to be registered only on the first session
 161                  */
 162                 goto unlock;
 163         }
 164         srv->dev.class = rtrs_dev_class;
 165         err = dev_set_name(&srv->dev, "%s", sess->s.sessname);
 166         if (err)
 167                 goto unlock;
 168
 169         /*
 170          * Suppress user space notification until
 171          * sysfs files are created
 172          */
 173         dev_set_uevent_suppress(&srv->dev, true);
 174         err = device_add(&srv->dev);
 175         if (err) {
 176                 pr_err("device_add(): %d\n", err);
 177                 goto put;
 178         }
 179         srv->kobj_paths = kobject_create_and_add("paths", &srv->dev.kobj);
 180         if (!srv->kobj_paths) {
 181                 err = -ENOMEM;
 182                 pr_err("kobject_create_and_add(): %d\n", err);
 183                 device_del(&srv->dev);
 184                 goto unlock;
 185         }
 186         dev_set_uevent_suppress(&srv->dev, false);
 187         kobject_uevent(&srv->dev.kobj, KOBJ_ADD);
 188         goto unlock;
 189
 190 put:
 191         put_device(&srv->dev);
 192 unlock:
 193         mutex_unlock(&srv->paths_mutex);
 194
 195         return err;
 196 }
 197
 198 static void
 199 rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_sess *sess)
 200 {
 201         struct rtrs_srv *srv = sess->srv;
 202
 203         mutex_lock(&srv->paths_mutex);
 204         if (!--srv->dev_ref) {
 205                 kobject_del(srv->kobj_paths);
 206                 kobject_put(srv->kobj_paths);
 207                 mutex_unlock(&srv->paths_mutex);
 208                 device_del(&srv->dev);
 209         } else {
 210                 mutex_unlock(&srv->paths_mutex);
 211         }
 212 }
 213
 214 static void rtrs_srv_sess_stats_release(struct kobject *kobj)
 215 {
 216         struct rtrs_srv_stats *stats;
 217
 218         stats = container_of(kobj, struct rtrs_srv_stats, kobj_stats);
 219
 220         kfree(stats);
 221 }
 222
 223 static struct kobj_type ktype_stats = {
 224         .sysfs_ops = &kobj_sysfs_ops,
 225         .release = rtrs_srv_sess_stats_release,
 226 };
 227
 228 static int rtrs_srv_create_stats_files(struct rtrs_srv_sess *sess)
 229 {
 230         int err;
 231         struct rtrs_sess *s = &sess->s;
 232
 233         err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats,
 234                                    &sess->kobj, "stats");
 235         if (err) {
 236                 rtrs_err(s, "kobject_init_and_add(): %d\n", err);
 237                 return err;
 238         }
 239         err = sysfs_create_group(&sess->stats->kobj_stats,
 240                                  &rtrs_srv_stats_attr_group);
 241         if (err) {
 242                 rtrs_err(s, "sysfs_create_group(): %d\n", err);
 243                 goto err;
 244         }
 245
 246         return 0;
 247
 248 err:
 249         kobject_del(&sess->stats->kobj_stats);
 250         kobject_put(&sess->stats->kobj_stats);
 251
 252         return err;
 253 }
 254
 255 int rtrs_srv_create_sess_files(struct rtrs_srv_sess *sess)
 256 {
 257         struct rtrs_srv *srv = sess->srv;
 258         struct rtrs_sess *s = &sess->s;
 259         char str[NAME_MAX];
 260         int err, cnt;
 261
 262         cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr,
 263                               str, sizeof(str));
 264         cnt += scnprintf(str + cnt, sizeof(str) - cnt, "@");
 265         sockaddr_to_str((struct sockaddr *)&sess->s.src_addr,
 266                         str + cnt, sizeof(str) - cnt);
 267
 268         err = rtrs_srv_create_once_sysfs_root_folders(sess);
 269         if (err)
 270                 return err;
 271
 272         err = kobject_init_and_add(&sess->kobj, &ktype, srv->kobj_paths,
 273                                    "%s", str);
 274         if (err) {
 275                 rtrs_err(s, "kobject_init_and_add(): %d\n", err);
 276                 goto destroy_root;
 277         }
 278         err = sysfs_create_group(&sess->kobj, &rtrs_srv_sess_attr_group);
 279         if (err) {
 280                 rtrs_err(s, "sysfs_create_group(): %d\n", err);
 281                 goto put_kobj;
 282         }
 283         err = rtrs_srv_create_stats_files(sess);
 284         if (err)
 285                 goto remove_group;
 286
 287         return 0;
 288
 289 remove_group:
 290         sysfs_remove_group(&sess->kobj, &rtrs_srv_sess_attr_group);
 291 put_kobj:
 292         kobject_del(&sess->kobj);
 293         kobject_put(&sess->kobj);
 294 destroy_root:
 295         rtrs_srv_destroy_once_sysfs_root_folders(sess);
 296
 297         return err;
 298 }
 299
 300 void rtrs_srv_destroy_sess_files(struct rtrs_srv_sess *sess)
 301 {
 302         if (sess->kobj.state_in_sysfs) {
 303                 kobject_del(&sess->stats->kobj_stats);
 304                 kobject_put(&sess->stats->kobj_stats);
 305                 kobject_del(&sess->kobj);
 306                 kobject_put(&sess->kobj);
 307
 308                 rtrs_srv_destroy_once_sysfs_root_folders(sess);
 309         }
 310 }