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_path *srv_path;
  19
  20         srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
  21         kfree(srv_path);
  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_path *srv_path;
  40         struct rtrs_path *s;
  41         char str[MAXHOSTNAMELEN];
  42
  43         srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
  44         s = &srv_path->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 *)&srv_path->s.dst_addr, str,
  52                         sizeof(str));
  53
  54         rtrs_info(s, "disconnect for path %s requested\n", str);
  55         /* first remove sysfs itself to avoid deadlock */
  56         sysfs_remove_file_self(&srv_path->kobj, &attr->attr);
  57         close_path(srv_path);
  58
  59         return count;
  60 }
  61
  62 static struct kobj_attribute rtrs_srv_disconnect_attr =
  63         __ATTR(disconnect, 0644,
  64                rtrs_srv_disconnect_show, rtrs_srv_disconnect_store);
  65
  66 static ssize_t rtrs_srv_hca_port_show(struct kobject *kobj,
  67                                        struct kobj_attribute *attr,
  68                                        char *page)
  69 {
  70         struct rtrs_srv_path *srv_path;
  71         struct rtrs_con *usr_con;
  72
  73         srv_path = container_of(kobj, typeof(*srv_path), kobj);
  74         usr_con = srv_path->s.con[0];
  75
  76         return sysfs_emit(page, "%u\n", usr_con->cm_id->port_num);
  77 }
  78
  79 static struct kobj_attribute rtrs_srv_hca_port_attr =
  80         __ATTR(hca_port, 0444, rtrs_srv_hca_port_show, NULL);
  81
  82 static ssize_t rtrs_srv_hca_name_show(struct kobject *kobj,
  83                                        struct kobj_attribute *attr,
  84                                        char *page)
  85 {
  86         struct rtrs_srv_path *srv_path;
  87
  88         srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
  89
  90         return sysfs_emit(page, "%s\n", srv_path->s.dev->ib_dev->name);
  91 }
  92
  93 static struct kobj_attribute rtrs_srv_hca_name_attr =
  94         __ATTR(hca_name, 0444, rtrs_srv_hca_name_show, NULL);
  95
  96 static ssize_t rtrs_srv_src_addr_show(struct kobject *kobj,
  97                                        struct kobj_attribute *attr,
  98                                        char *page)
  99 {
 100         struct rtrs_srv_path *srv_path;
 101         int cnt;
 102
 103         srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
 104         cnt = sockaddr_to_str((struct sockaddr *)&srv_path->s.dst_addr,
 105                               page, PAGE_SIZE);
 106         return cnt + sysfs_emit_at(page, cnt, "\n");
 107 }
 108
 109 static struct kobj_attribute rtrs_srv_src_addr_attr =
 110         __ATTR(src_addr, 0444, rtrs_srv_src_addr_show, NULL);
 111
 112 static ssize_t rtrs_srv_dst_addr_show(struct kobject *kobj,
 113                                        struct kobj_attribute *attr,
 114                                        char *page)
 115 {
 116         struct rtrs_srv_path *srv_path;
 117         int len;
 118
 119         srv_path = container_of(kobj, struct rtrs_srv_path, kobj);
 120         len = sockaddr_to_str((struct sockaddr *)&srv_path->s.src_addr, page,
 121                               PAGE_SIZE);
 122         len += sysfs_emit_at(page, len, "\n");
 123         return len;
 124 }
 125
 126 static struct kobj_attribute rtrs_srv_dst_addr_attr =
 127         __ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL);
 128
 129 static struct attribute *rtrs_srv_path_attrs[] = {
 130         &rtrs_srv_hca_name_attr.attr,
 131         &rtrs_srv_hca_port_attr.attr,
 132         &rtrs_srv_src_addr_attr.attr,
 133         &rtrs_srv_dst_addr_attr.attr,
 134         &rtrs_srv_disconnect_attr.attr,
 135         NULL,
 136 };
 137
 138 static const struct attribute_group rtrs_srv_path_attr_group = {
 139         .attrs = rtrs_srv_path_attrs,
 140 };
 141
 142 STAT_ATTR(struct rtrs_srv_stats, rdma,
 143           rtrs_srv_stats_rdma_to_str,
 144           rtrs_srv_reset_rdma_stats);
 145
 146 static struct attribute *rtrs_srv_stats_attrs[] = {
 147         &rdma_attr.attr,
 148         NULL,
 149 };
 150
 151 static const struct attribute_group rtrs_srv_stats_attr_group = {
 152         .attrs = rtrs_srv_stats_attrs,
 153 };
 154
 155 static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)
 156 {
 157         struct rtrs_srv_sess *srv = srv_path->srv;
 158         int err = 0;
 159
 160         mutex_lock(&srv->paths_mutex);
 161         if (srv->dev_ref++) {
 162                 /*
 163                  * Device needs to be registered only on the first session
 164                  */
 165                 goto unlock;
 166         }
 167         srv->dev.class = &rtrs_dev_class;
 168         err = dev_set_name(&srv->dev, "%s", srv_path->s.sessname);
 169         if (err)
 170                 goto unlock;
 171
 172         /*
 173          * Suppress user space notification until
 174          * sysfs files are created
 175          */
 176         dev_set_uevent_suppress(&srv->dev, true);
 177         err = device_add(&srv->dev);
 178         if (err) {
 179                 pr_err("device_add(): %d\n", err);
 180                 put_device(&srv->dev);
 181                 goto unlock;
 182         }
 183         srv->kobj_paths = kobject_create_and_add("paths", &srv->dev.kobj);
 184         if (!srv->kobj_paths) {
 185                 err = -ENOMEM;
 186                 pr_err("kobject_create_and_add(): %d\n", err);
 187                 device_del(&srv->dev);
 188                 put_device(&srv->dev);
 189                 goto unlock;
 190         }
 191         dev_set_uevent_suppress(&srv->dev, false);
 192         kobject_uevent(&srv->dev.kobj, KOBJ_ADD);
 193 unlock:
 194         mutex_unlock(&srv->paths_mutex);
 195
 196         return err;
 197 }
 198
 199 static void
 200 rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)
 201 {
 202         struct rtrs_srv_sess *srv = srv_path->srv;
 203
 204         mutex_lock(&srv->paths_mutex);
 205         if (!--srv->dev_ref) {
 206                 kobject_put(srv->kobj_paths);
 207                 mutex_unlock(&srv->paths_mutex);
 208                 device_del(&srv->dev);
 209                 put_device(&srv->dev);
 210         } else {
 211                 put_device(&srv->dev);
 212                 mutex_unlock(&srv->paths_mutex);
 213         }
 214 }
 215
 216 static void rtrs_srv_path_stats_release(struct kobject *kobj)
 217 {
 218         struct rtrs_srv_stats *stats;
 219
 220         stats = container_of(kobj, struct rtrs_srv_stats, kobj_stats);
 221
 222         free_percpu(stats->rdma_stats);
 223
 224         kfree(stats);
 225 }
 226
 227 static struct kobj_type ktype_stats = {
 228         .sysfs_ops = &kobj_sysfs_ops,
 229         .release = rtrs_srv_path_stats_release,
 230 };
 231
 232 static int rtrs_srv_create_stats_files(struct rtrs_srv_path *srv_path)
 233 {
 234         int err;
 235         struct rtrs_path *s = &srv_path->s;
 236
 237         err = kobject_init_and_add(&srv_path->stats->kobj_stats, &ktype_stats,
 238                                    &srv_path->kobj, "stats");
 239         if (err) {
 240                 rtrs_err(s, "kobject_init_and_add(): %d\n", err);
 241                 kobject_put(&srv_path->stats->kobj_stats);
 242                 return err;
 243         }
 244         err = sysfs_create_group(&srv_path->stats->kobj_stats,
 245                                  &rtrs_srv_stats_attr_group);
 246         if (err) {
 247                 rtrs_err(s, "sysfs_create_group(): %d\n", err);
 248                 goto err;
 249         }
 250
 251         return 0;
 252
 253 err:
 254         kobject_del(&srv_path->stats->kobj_stats);
 255         kobject_put(&srv_path->stats->kobj_stats);
 256
 257         return err;
 258 }
 259
 260 int rtrs_srv_create_path_files(struct rtrs_srv_path *srv_path)
 261 {
 262         struct rtrs_srv_sess *srv = srv_path->srv;
 263         struct rtrs_path *s = &srv_path->s;
 264         char str[NAME_MAX];
 265         int err;
 266         struct rtrs_addr path = {
 267                 .src = &srv_path->s.dst_addr,
 268                 .dst = &srv_path->s.src_addr,
 269         };
 270
 271         rtrs_addr_to_str(&path, str, sizeof(str));
 272         err = rtrs_srv_create_once_sysfs_root_folders(srv_path);
 273         if (err)
 274                 return err;
 275
 276         err = kobject_init_and_add(&srv_path->kobj, &ktype, srv->kobj_paths,
 277                                    "%s", str);
 278         if (err) {
 279                 rtrs_err(s, "kobject_init_and_add(): %d\n", err);
 280                 goto destroy_root;
 281         }
 282         err = sysfs_create_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
 283         if (err) {
 284                 rtrs_err(s, "sysfs_create_group(): %d\n", err);
 285                 goto put_kobj;
 286         }
 287         err = rtrs_srv_create_stats_files(srv_path);
 288         if (err)
 289                 goto remove_group;
 290
 291         return 0;
 292
 293 remove_group:
 294         sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
 295 put_kobj:
 296         kobject_del(&srv_path->kobj);
 297 destroy_root:
 298         kobject_put(&srv_path->kobj);
 299         rtrs_srv_destroy_once_sysfs_root_folders(srv_path);
 300
 301         return err;
 302 }
 303
 304 void rtrs_srv_destroy_path_files(struct rtrs_srv_path *srv_path)
 305 {
 306         if (srv_path->stats->kobj_stats.state_in_sysfs) {
 307                 sysfs_remove_group(&srv_path->stats->kobj_stats,
 308                                    &rtrs_srv_stats_attr_group);
 309                 kobject_del(&srv_path->stats->kobj_stats);
 310                 kobject_put(&srv_path->stats->kobj_stats);
 311         }
 312
 313         if (srv_path->kobj.state_in_sysfs) {
 314                 sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);
 315                 kobject_put(&srv_path->kobj);
 316                 rtrs_srv_destroy_once_sysfs_root_folders(srv_path);
 317         }
 318
 319 }