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sysfs.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: sysfs.c 1349 2004-12-16 21:09:43Z roland $
 */

#include "core_priv.h"

#include <linux/slab.h>
#include <linux/string.h>

#include <rdma/ib_mad.h>

struct ib_port {
      struct kobject         kobj;
      struct ib_device      *ibdev;
      struct attribute_group gid_group;
      struct attribute_group pkey_group;
      u8                     port_num;
};

struct port_attribute {
      struct attribute attr;
      ssize_t (*show)(struct ib_port *, struct port_attribute *, char *buf);
      ssize_t (*store)(struct ib_port *, struct port_attribute *,
                   const char *buf, size_t count);
};

#define PORT_ATTR(_name, _mode, _show, _store) \
struct port_attribute port_attr_##_name = __ATTR(_name, _mode, _show, _store)

#define PORT_ATTR_RO(_name) \
struct port_attribute port_attr_##_name = __ATTR_RO(_name)

struct port_table_attribute {
      struct port_attribute   attr;
      char              name[8];
      int               index;
};

static inline int ibdev_is_alive(const struct ib_device *dev)
{
      return dev->reg_state == IB_DEV_REGISTERED;
}

static ssize_t port_attr_show(struct kobject *kobj,
                        struct attribute *attr, char *buf)
{
      struct port_attribute *port_attr =
            container_of(attr, struct port_attribute, attr);
      struct ib_port *p = container_of(kobj, struct ib_port, kobj);

      if (!port_attr->show)
            return -EIO;
      if (!ibdev_is_alive(p->ibdev))
            return -ENODEV;

      return port_attr->show(p, port_attr, buf);
}

static struct sysfs_ops port_sysfs_ops = {
      .show = port_attr_show
};

static ssize_t state_show(struct ib_port *p, struct port_attribute *unused,
                    char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      static const char *state_name[] = {
            [IB_PORT_NOP]           = "NOP",
            [IB_PORT_DOWN]          = "DOWN",
            [IB_PORT_INIT]          = "INIT",
            [IB_PORT_ARMED]         = "ARMED",
            [IB_PORT_ACTIVE]  = "ACTIVE",
            [IB_PORT_ACTIVE_DEFER]  = "ACTIVE_DEFER"
      };

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "%d: %s\n", attr.state,
                   attr.state >= 0 && attr.state < ARRAY_SIZE(state_name) ?
                   state_name[attr.state] : "UNKNOWN");
}

static ssize_t lid_show(struct ib_port *p, struct port_attribute *unused,
                  char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "0x%x\n", attr.lid);
}

static ssize_t lid_mask_count_show(struct ib_port *p,
                           struct port_attribute *unused,
                           char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "%d\n", attr.lmc);
}

static ssize_t sm_lid_show(struct ib_port *p, struct port_attribute *unused,
                     char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "0x%x\n", attr.sm_lid);
}

static ssize_t sm_sl_show(struct ib_port *p, struct port_attribute *unused,
                    char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "%d\n", attr.sm_sl);
}

static ssize_t cap_mask_show(struct ib_port *p, struct port_attribute *unused,
                       char *buf)
{
      struct ib_port_attr attr;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "0x%08x\n", attr.port_cap_flags);
}

static ssize_t rate_show(struct ib_port *p, struct port_attribute *unused,
                   char *buf)
{
      struct ib_port_attr attr;
      char *speed = "";
      int rate;
      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      switch (attr.active_speed) {
      case 2: speed = " DDR"; break;
      case 4: speed = " QDR"; break;
      }

      rate = 25 * ib_width_enum_to_int(attr.active_width) * attr.active_speed;
      if (rate < 0)
            return -EINVAL;

      return sprintf(buf, "%d%s Gb/sec (%dX%s)\n",
                   rate / 10, rate % 10 ? ".5" : "",
                   ib_width_enum_to_int(attr.active_width), speed);
}

static ssize_t phys_state_show(struct ib_port *p, struct port_attribute *unused,
                         char *buf)
{
      struct ib_port_attr attr;

      ssize_t ret;

      ret = ib_query_port(p->ibdev, p->port_num, &attr);
      if (ret)
            return ret;

      switch (attr.phys_state) {
      case 1:  return sprintf(buf, "1: Sleep\n");
      case 2:  return sprintf(buf, "2: Polling\n");
      case 3:  return sprintf(buf, "3: Disabled\n");
      case 4:  return sprintf(buf, "4: PortConfigurationTraining\n");
      case 5:  return sprintf(buf, "5: LinkUp\n");
      case 6:  return sprintf(buf, "6: LinkErrorRecovery\n");
      case 7:  return sprintf(buf, "7: Phy Test\n");
      default: return sprintf(buf, "%d: <unknown>\n", attr.phys_state);
      }
}

static PORT_ATTR_RO(state);
static PORT_ATTR_RO(lid);
static PORT_ATTR_RO(lid_mask_count);
static PORT_ATTR_RO(sm_lid);
static PORT_ATTR_RO(sm_sl);
static PORT_ATTR_RO(cap_mask);
static PORT_ATTR_RO(rate);
static PORT_ATTR_RO(phys_state);

static struct attribute *port_default_attrs[] = {
      &port_attr_state.attr,
      &port_attr_lid.attr,
      &port_attr_lid_mask_count.attr,
      &port_attr_sm_lid.attr,
      &port_attr_sm_sl.attr,
      &port_attr_cap_mask.attr,
      &port_attr_rate.attr,
      &port_attr_phys_state.attr,
      NULL
};

static ssize_t show_port_gid(struct ib_port *p, struct port_attribute *attr,
                       char *buf)
{
      struct port_table_attribute *tab_attr =
            container_of(attr, struct port_table_attribute, attr);
      union ib_gid gid;
      ssize_t ret;

      ret = ib_query_gid(p->ibdev, p->port_num, tab_attr->index, &gid);
      if (ret)
            return ret;

      return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
                   be16_to_cpu(((__be16 *) gid.raw)[0]),
                   be16_to_cpu(((__be16 *) gid.raw)[1]),
                   be16_to_cpu(((__be16 *) gid.raw)[2]),
                   be16_to_cpu(((__be16 *) gid.raw)[3]),
                   be16_to_cpu(((__be16 *) gid.raw)[4]),
                   be16_to_cpu(((__be16 *) gid.raw)[5]),
                   be16_to_cpu(((__be16 *) gid.raw)[6]),
                   be16_to_cpu(((__be16 *) gid.raw)[7]));
}

static ssize_t show_port_pkey(struct ib_port *p, struct port_attribute *attr,
                        char *buf)
{
      struct port_table_attribute *tab_attr =
            container_of(attr, struct port_table_attribute, attr);
      u16 pkey;
      ssize_t ret;

      ret = ib_query_pkey(p->ibdev, p->port_num, tab_attr->index, &pkey);
      if (ret)
            return ret;

      return sprintf(buf, "0x%04x\n", pkey);
}

#define PORT_PMA_ATTR(_name, _counter, _width, _offset)                 \
struct port_table_attribute port_pma_attr_##_name = {             \
      .attr  = __ATTR(_name, S_IRUGO, show_pma_counter, NULL),    \
      .index = (_offset) | ((_width) << 16) | ((_counter) << 24)  \
}

static ssize_t show_pma_counter(struct ib_port *p, struct port_attribute *attr,
                        char *buf)
{
      struct port_table_attribute *tab_attr =
            container_of(attr, struct port_table_attribute, attr);
      int offset = tab_attr->index & 0xffff;
      int width  = (tab_attr->index >> 16) & 0xff;
      struct ib_mad *in_mad  = NULL;
      struct ib_mad *out_mad = NULL;
      ssize_t ret;

      if (!p->ibdev->process_mad)
            return sprintf(buf, "N/A (no PMA)\n");

      in_mad  = kzalloc(sizeof *in_mad, GFP_KERNEL);
      out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
      if (!in_mad || !out_mad) {
            ret = -ENOMEM;
            goto out;
      }

      in_mad->mad_hdr.base_version  = 1;
      in_mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_PERF_MGMT;
      in_mad->mad_hdr.class_version = 1;
      in_mad->mad_hdr.method        = IB_MGMT_METHOD_GET;
      in_mad->mad_hdr.attr_id       = cpu_to_be16(0x12); /* PortCounters */

      in_mad->data[41] = p->port_num;     /* PortSelect field */

      if ((p->ibdev->process_mad(p->ibdev, IB_MAD_IGNORE_MKEY,
             p->port_num, NULL, NULL, in_mad, out_mad) &
           (IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY)) !=
          (IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY)) {
            ret = -EINVAL;
            goto out;
      }

      switch (width) {
      case 4:
            ret = sprintf(buf, "%u\n", (out_mad->data[40 + offset / 8] >>
                                  (4 - (offset % 8))) & 0xf);
            break;
      case 8:
            ret = sprintf(buf, "%u\n", out_mad->data[40 + offset / 8]);
            break;
      case 16:
            ret = sprintf(buf, "%u\n",
                        be16_to_cpup((__be16 *)(out_mad->data + 40 + offset / 8)));
            break;
      case 32:
            ret = sprintf(buf, "%u\n",
                        be32_to_cpup((__be32 *)(out_mad->data + 40 + offset / 8)));
            break;
      default:
            ret = 0;
      }

out:
      kfree(in_mad);
      kfree(out_mad);

      return ret;
}

static PORT_PMA_ATTR(symbol_error             ,  0, 16,  32);
static PORT_PMA_ATTR(link_error_recovery      ,  1,  8,  48);
static PORT_PMA_ATTR(link_downed              ,  2,  8,  56);
static PORT_PMA_ATTR(port_rcv_errors                ,  3, 16,  64);
static PORT_PMA_ATTR(port_rcv_remote_physical_errors,  4, 16,  80);
static PORT_PMA_ATTR(port_rcv_switch_relay_errors   ,  5, 16,  96);
static PORT_PMA_ATTR(port_xmit_discards             ,  6, 16, 112);
static PORT_PMA_ATTR(port_xmit_constraint_errors    ,  7,  8, 128);
static PORT_PMA_ATTR(port_rcv_constraint_errors     ,  8,  8, 136);
static PORT_PMA_ATTR(local_link_integrity_errors    ,  9,  4, 152);
static PORT_PMA_ATTR(excessive_buffer_overrun_errors, 10,  4, 156);
static PORT_PMA_ATTR(VL15_dropped             , 11, 16, 176);
static PORT_PMA_ATTR(port_xmit_data           , 12, 32, 192);
static PORT_PMA_ATTR(port_rcv_data            , 13, 32, 224);
static PORT_PMA_ATTR(port_xmit_packets              , 14, 32, 256);
static PORT_PMA_ATTR(port_rcv_packets               , 15, 32, 288);

static struct attribute *pma_attrs[] = {
      &port_pma_attr_symbol_error.attr.attr,
      &port_pma_attr_link_error_recovery.attr.attr,
      &port_pma_attr_link_downed.attr.attr,
      &port_pma_attr_port_rcv_errors.attr.attr,
      &port_pma_attr_port_rcv_remote_physical_errors.attr.attr,
      &port_pma_attr_port_rcv_switch_relay_errors.attr.attr,
      &port_pma_attr_port_xmit_discards.attr.attr,
      &port_pma_attr_port_xmit_constraint_errors.attr.attr,
      &port_pma_attr_port_rcv_constraint_errors.attr.attr,
      &port_pma_attr_local_link_integrity_errors.attr.attr,
      &port_pma_attr_excessive_buffer_overrun_errors.attr.attr,
      &port_pma_attr_VL15_dropped.attr.attr,
      &port_pma_attr_port_xmit_data.attr.attr,
      &port_pma_attr_port_rcv_data.attr.attr,
      &port_pma_attr_port_xmit_packets.attr.attr,
      &port_pma_attr_port_rcv_packets.attr.attr,
      NULL
};

static struct attribute_group pma_group = {
      .name  = "counters",
      .attrs  = pma_attrs
};

static void ib_port_release(struct kobject *kobj)
{
      struct ib_port *p = container_of(kobj, struct ib_port, kobj);
      struct attribute *a;
      int i;

      for (i = 0; (a = p->gid_group.attrs[i]); ++i)
            kfree(a);

      kfree(p->gid_group.attrs);

      for (i = 0; (a = p->pkey_group.attrs[i]); ++i)
            kfree(a);

      kfree(p->pkey_group.attrs);

      kfree(p);
}

static struct kobj_type port_type = {
      .release       = ib_port_release,
      .sysfs_ops     = &port_sysfs_ops,
      .default_attrs = port_default_attrs
};

static void ib_device_release(struct class_device *cdev)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);

      kfree(dev);
}

static int ib_device_uevent(struct class_device *cdev,
                      struct kobj_uevent_env *env)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);

      if (add_uevent_var(env, "NAME=%s", dev->name))
            return -ENOMEM;

      /*
       * It would be nice to pass the node GUID with the event...
       */

      return 0;
}

static struct attribute **
alloc_group_attrs(ssize_t (*show)(struct ib_port *,
                          struct port_attribute *, char *buf),
              int len)
{
      struct attribute **tab_attr;
      struct port_table_attribute *element;
      int i;

      tab_attr = kcalloc(1 + len, sizeof(struct attribute *), GFP_KERNEL);
      if (!tab_attr)
            return NULL;

      for (i = 0; i < len; i++) {
            element = kzalloc(sizeof(struct port_table_attribute),
                          GFP_KERNEL);
            if (!element)
                  goto err;

            if (snprintf(element->name, sizeof(element->name),
                       "%d", i) >= sizeof(element->name)) {
                  kfree(element);
                  goto err;
            }

            element->attr.attr.name  = element->name;
            element->attr.attr.mode  = S_IRUGO;
            element->attr.show       = show;
            element->index           = i;

            tab_attr[i] = &element->attr.attr;
      }

      return tab_attr;

err:
      while (--i >= 0)
            kfree(tab_attr[i]);
      kfree(tab_attr);
      return NULL;
}

static int add_port(struct ib_device *device, int port_num)
{
      struct ib_port *p;
      struct ib_port_attr attr;
      int i;
      int ret;

      ret = ib_query_port(device, port_num, &attr);
      if (ret)
            return ret;

      p = kzalloc(sizeof *p, GFP_KERNEL);
      if (!p)
            return -ENOMEM;

      p->ibdev      = device;
      p->port_num   = port_num;
      p->kobj.ktype = &port_type;

      p->kobj.parent = kobject_get(&device->ports_parent);
      if (!p->kobj.parent) {
            ret = -EBUSY;
            goto err;
      }

      ret = kobject_set_name(&p->kobj, "%d", port_num);
      if (ret)
            goto err_put;

      ret = kobject_register(&p->kobj);
      if (ret)
            goto err_put;

      ret = sysfs_create_group(&p->kobj, &pma_group);
      if (ret)
            goto err_put;

      p->gid_group.name  = "gids";
      p->gid_group.attrs = alloc_group_attrs(show_port_gid, attr.gid_tbl_len);
      if (!p->gid_group.attrs)
            goto err_remove_pma;

      ret = sysfs_create_group(&p->kobj, &p->gid_group);
      if (ret)
            goto err_free_gid;

      p->pkey_group.name  = "pkeys";
      p->pkey_group.attrs = alloc_group_attrs(show_port_pkey,
                                    attr.pkey_tbl_len);
      if (!p->pkey_group.attrs)
            goto err_remove_gid;

      ret = sysfs_create_group(&p->kobj, &p->pkey_group);
      if (ret)
            goto err_free_pkey;

      list_add_tail(&p->kobj.entry, &device->port_list);

      return 0;

err_free_pkey:
      for (i = 0; i < attr.pkey_tbl_len; ++i)
            kfree(p->pkey_group.attrs[i]);

      kfree(p->pkey_group.attrs);

err_remove_gid:
      sysfs_remove_group(&p->kobj, &p->gid_group);

err_free_gid:
      for (i = 0; i < attr.gid_tbl_len; ++i)
            kfree(p->gid_group.attrs[i]);

      kfree(p->gid_group.attrs);

err_remove_pma:
      sysfs_remove_group(&p->kobj, &pma_group);

err_put:
      kobject_put(&device->ports_parent);

err:
      kfree(p);
      return ret;
}

static ssize_t show_node_type(struct class_device *cdev, char *buf)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);

      if (!ibdev_is_alive(dev))
            return -ENODEV;

      switch (dev->node_type) {
      case RDMA_NODE_IB_CA:     return sprintf(buf, "%d: CA\n", dev->node_type);
      case RDMA_NODE_RNIC:      return sprintf(buf, "%d: RNIC\n", dev->node_type);
      case RDMA_NODE_IB_SWITCH: return sprintf(buf, "%d: switch\n", dev->node_type);
      case RDMA_NODE_IB_ROUTER: return sprintf(buf, "%d: router\n", dev->node_type);
      default:            return sprintf(buf, "%d: <unknown>\n", dev->node_type);
      }
}

static ssize_t show_sys_image_guid(struct class_device *cdev, char *buf)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);
      struct ib_device_attr attr;
      ssize_t ret;

      if (!ibdev_is_alive(dev))
            return -ENODEV;

      ret = ib_query_device(dev, &attr);
      if (ret)
            return ret;

      return sprintf(buf, "%04x:%04x:%04x:%04x\n",
                   be16_to_cpu(((__be16 *) &attr.sys_image_guid)[0]),
                   be16_to_cpu(((__be16 *) &attr.sys_image_guid)[1]),
                   be16_to_cpu(((__be16 *) &attr.sys_image_guid)[2]),
                   be16_to_cpu(((__be16 *) &attr.sys_image_guid)[3]));
}

static ssize_t show_node_guid(struct class_device *cdev, char *buf)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);

      if (!ibdev_is_alive(dev))
            return -ENODEV;

      return sprintf(buf, "%04x:%04x:%04x:%04x\n",
                   be16_to_cpu(((__be16 *) &dev->node_guid)[0]),
                   be16_to_cpu(((__be16 *) &dev->node_guid)[1]),
                   be16_to_cpu(((__be16 *) &dev->node_guid)[2]),
                   be16_to_cpu(((__be16 *) &dev->node_guid)[3]));
}

static ssize_t show_node_desc(struct class_device *cdev, char *buf)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);

      return sprintf(buf, "%.64s\n", dev->node_desc);
}

static ssize_t set_node_desc(struct class_device *cdev, const char *buf,
                        size_t count)
{
      struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);
      struct ib_device_modify desc = {};
      int ret;

      if (!dev->modify_device)
            return -EIO;

      memcpy(desc.node_desc, buf, min_t(int, count, 64));
      ret = ib_modify_device(dev, IB_DEVICE_MODIFY_NODE_DESC, &desc);
      if (ret)
            return ret;

      return count;
}

static CLASS_DEVICE_ATTR(node_type, S_IRUGO, show_node_type, NULL);
static CLASS_DEVICE_ATTR(sys_image_guid, S_IRUGO, show_sys_image_guid, NULL);
static CLASS_DEVICE_ATTR(node_guid, S_IRUGO, show_node_guid, NULL);
static CLASS_DEVICE_ATTR(node_desc, S_IRUGO | S_IWUSR, show_node_desc,
                   set_node_desc);

static struct class_device_attribute *ib_class_attributes[] = {
      &class_device_attr_node_type,
      &class_device_attr_sys_image_guid,
      &class_device_attr_node_guid,
      &class_device_attr_node_desc
};

static struct class ib_class = {
      .name    = "infiniband",
      .release = ib_device_release,
      .uevent = ib_device_uevent,
};

int ib_device_register_sysfs(struct ib_device *device)
{
      struct class_device *class_dev = &device->class_dev;
      int ret;
      int i;

      class_dev->class      = &ib_class;
      class_dev->class_data = device;
      class_dev->dev          = device->dma_device;
      strlcpy(class_dev->class_id, device->name, BUS_ID_SIZE);

      INIT_LIST_HEAD(&device->port_list);

      ret = class_device_register(class_dev);
      if (ret)
            goto err;

      for (i = 0; i < ARRAY_SIZE(ib_class_attributes); ++i) {
            ret = class_device_create_file(class_dev, ib_class_attributes[i]);
            if (ret)
                  goto err_unregister;
      }

      device->ports_parent.parent = kobject_get(&class_dev->kobj);
      if (!device->ports_parent.parent) {
            ret = -EBUSY;
            goto err_unregister;
      }
      ret = kobject_set_name(&device->ports_parent, "ports");
      if (ret)
            goto err_put;
      ret = kobject_register(&device->ports_parent);
      if (ret)
            goto err_put;

      if (device->node_type == RDMA_NODE_IB_SWITCH) {
            ret = add_port(device, 0);
            if (ret)
                  goto err_put;
      } else {
            for (i = 1; i <= device->phys_port_cnt; ++i) {
                  ret = add_port(device, i);
                  if (ret)
                        goto err_put;
            }
      }

      return 0;

err_put:
      {
            struct kobject *p, *t;
            struct ib_port *port;

            list_for_each_entry_safe(p, t, &device->port_list, entry) {
                  list_del(&p->entry);
                  port = container_of(p, struct ib_port, kobj);
                  sysfs_remove_group(p, &pma_group);
                  sysfs_remove_group(p, &port->pkey_group);
                  sysfs_remove_group(p, &port->gid_group);
                  kobject_unregister(p);
            }
      }

      kobject_put(&class_dev->kobj);

err_unregister:
      class_device_unregister(class_dev);

err:
      return ret;
}

void ib_device_unregister_sysfs(struct ib_device *device)
{
      struct kobject *p, *t;
      struct ib_port *port;

      list_for_each_entry_safe(p, t, &device->port_list, entry) {
            list_del(&p->entry);
            port = container_of(p, struct ib_port, kobj);
            sysfs_remove_group(p, &pma_group);
            sysfs_remove_group(p, &port->pkey_group);
            sysfs_remove_group(p, &port->gid_group);
            kobject_unregister(p);
      }

      kobject_unregister(&device->ports_parent);
      class_device_unregister(&device->class_dev);
}

int ib_sysfs_setup(void)
{
      return class_register(&ib_class);
}

void ib_sysfs_cleanup(void)
{
      class_unregister(&ib_class);
}

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