sysfs.c

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/*
 * Copyright (c) 2012 Mellanox Technologies.  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.
 */

/*#include "core_priv.h"*/
#include "mlx4_ib.h"
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/stat.h>

#include <rdma/ib_mad.h>
/*show_admin_alias_guid returns the administratively assigned value of that GUID.
 * Values returned in buf parameter string:
 *  0           - requests opensm to assign a value.
 *  ffffffffffffffff    - delete this entry.
 *  other           - value assigned by administrator.
 */
static ssize_t show_admin_alias_guid(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
    int record_num;/*0-15*/
    int guid_index_in_rec; /*0 - 7*/
    struct mlx4_ib_iov_sysfs_attr *mlx4_ib_iov_dentry =
        container_of(attr, struct mlx4_ib_iov_sysfs_attr, dentry);
    struct mlx4_ib_iov_port *port = mlx4_ib_iov_dentry->ctx;
    struct mlx4_ib_dev *mdev = port->dev;

    record_num = mlx4_ib_iov_dentry->entry_num / 8 ;
    guid_index_in_rec = mlx4_ib_iov_dentry->entry_num % 8 ;

    return sprintf(buf, "%llx\n",
               be64_to_cpu(*(__be64 *)&mdev->sriov.alias_guid.
                   ports_guid[port->num - 1].
                   all_rec_per_port[record_num].
                   all_recs[8 * guid_index_in_rec]));
}

/* store_admin_alias_guid stores the (new) administratively assigned value of that GUID.
 * Values in buf parameter string:
 *  0           - requests opensm to assign a value.
 *  0xffffffffffffffff  - delete this entry.
 *  other           - guid value assigned by the administrator.
 */
static ssize_t store_admin_alias_guid(struct device *dev,
                      struct device_attribute *attr,
                      const char *buf, size_t count)
{
    int record_num;/*0-15*/
    int guid_index_in_rec; /*0 - 7*/
    struct mlx4_ib_iov_sysfs_attr *mlx4_ib_iov_dentry =
        container_of(attr, struct mlx4_ib_iov_sysfs_attr, dentry);
    struct mlx4_ib_iov_port *port = mlx4_ib_iov_dentry->ctx;
    struct mlx4_ib_dev *mdev = port->dev;
    u64 sysadmin_ag_val;

    record_num = mlx4_ib_iov_dentry->entry_num / 8;
    guid_index_in_rec = mlx4_ib_iov_dentry->entry_num % 8;
    if (0 == record_num && 0 == guid_index_in_rec) {
        pr_err("GUID 0 block 0 is RO\n");
        return count;
    }
    sscanf(buf, "%llx", &sysadmin_ag_val);
    *(__be64 *)&mdev->sriov.alias_guid.ports_guid[port->num - 1].
        all_rec_per_port[record_num].
        all_recs[GUID_REC_SIZE * guid_index_in_rec] =
            cpu_to_be64(sysadmin_ag_val);

    /* Change the state to be pending for update */
    mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].status
        = MLX4_GUID_INFO_STATUS_IDLE ;

    mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].method
        = MLX4_GUID_INFO_RECORD_SET;

    switch (sysadmin_ag_val) {
    case MLX4_GUID_FOR_DELETE_VAL:
        mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].method
            = MLX4_GUID_INFO_RECORD_DELETE;
        mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].ownership
            = MLX4_GUID_SYSADMIN_ASSIGN;
        break;
    /* The sysadmin requests the SM to re-assign */
    case MLX4_NOT_SET_GUID:
        mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].ownership
            = MLX4_GUID_DRIVER_ASSIGN;
        break;
    /* The sysadmin requests a specific value.*/
    default:
        mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].ownership
            = MLX4_GUID_SYSADMIN_ASSIGN;
        break;
    }

    /* set the record index */
    mdev->sriov.alias_guid.ports_guid[port->num - 1].all_rec_per_port[record_num].guid_indexes
        = mlx4_ib_get_aguid_comp_mask_from_ix(guid_index_in_rec);

    mlx4_ib_init_alias_guid_work(mdev, port->num - 1);

    return count;
}

static ssize_t show_port_gid(struct device *dev,
                 struct device_attribute *attr,
                 char *buf)
{
    struct mlx4_ib_iov_sysfs_attr *mlx4_ib_iov_dentry =
        container_of(attr, struct mlx4_ib_iov_sysfs_attr, dentry);
    struct mlx4_ib_iov_port *port = mlx4_ib_iov_dentry->ctx;
    struct mlx4_ib_dev *mdev = port->dev;
    union ib_gid gid;
    ssize_t ret;

    ret = __mlx4_ib_query_gid(&mdev->ib_dev, port->num,
                  mlx4_ib_iov_dentry->entry_num, &gid, 1);
    if (ret)
        return ret;
    ret = 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]));
    return ret;
}

static ssize_t show_phys_port_pkey(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
    struct mlx4_ib_iov_sysfs_attr *mlx4_ib_iov_dentry =
        container_of(attr, struct mlx4_ib_iov_sysfs_attr, dentry);
    struct mlx4_ib_iov_port *port = mlx4_ib_iov_dentry->ctx;
    struct mlx4_ib_dev *mdev = port->dev;
    u16 pkey;
    ssize_t ret;

    ret = __mlx4_ib_query_pkey(&mdev->ib_dev, port->num,
                   mlx4_ib_iov_dentry->entry_num, &pkey, 1);
    if (ret)
        return ret;

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

#define DENTRY_REMOVE(_dentry)                      \
do {                                    \
    sysfs_remove_file((_dentry)->kobj, &(_dentry)->dentry.attr);    \
} while (0);

static int create_sysfs_entry(void *_ctx, struct mlx4_ib_iov_sysfs_attr *_dentry,
                  char *_name, struct kobject *_kobj,
                  ssize_t (*show)(struct device *dev,
                          struct device_attribute *attr,
                          char *buf),
                  ssize_t (*store)(struct device *dev,
                           struct device_attribute *attr,
                           const char *buf, size_t count)
                  )
{
    int ret = 0;
    struct mlx4_ib_iov_sysfs_attr *vdentry = _dentry;

    vdentry->ctx = _ctx;
    vdentry->dentry.show = show;
    vdentry->dentry.store = store;
    sysfs_attr_init(&vdentry->dentry.attr);
    vdentry->dentry.attr.name = vdentry->name;
    vdentry->dentry.attr.mode = 0;
    vdentry->kobj = _kobj;
    snprintf(vdentry->name, 15, "%s", _name);

    if (vdentry->dentry.store)
        vdentry->dentry.attr.mode |= S_IWUSR;

    if (vdentry->dentry.show)
        vdentry->dentry.attr.mode |= S_IRUGO;

    ret = sysfs_create_file(vdentry->kobj, &vdentry->dentry.attr);
    if (ret) {
        pr_err("failed to create %s\n", vdentry->dentry.attr.name);
        vdentry->ctx = NULL;
        return ret;
    }

    return ret;
}

int add_sysfs_port_mcg_attr(struct mlx4_ib_dev *device, int port_num,
        struct attribute *attr)
{
    struct mlx4_ib_iov_port *port = &device->iov_ports[port_num - 1];
    int ret;

    ret = sysfs_create_file(port->mcgs_parent, attr);
    if (ret)
        pr_err("failed to create %s\n", attr->name);

    return ret;
}

void del_sysfs_port_mcg_attr(struct mlx4_ib_dev *device, int port_num,
        struct attribute *attr)
{
    struct mlx4_ib_iov_port *port = &device->iov_ports[port_num - 1];

    sysfs_remove_file(port->mcgs_parent, attr);
}

static int add_port_entries(struct mlx4_ib_dev *device, int port_num)
{
    int i;
    char buff[10];
    struct mlx4_ib_iov_port *port = NULL;
    int ret = 0 ;
    struct ib_port_attr attr;

    /* get the physical gid and pkey table sizes.*/
    ret = __mlx4_ib_query_port(&device->ib_dev, port_num, &attr, 1);
    if (ret)
        goto err;

    port = &device->iov_ports[port_num - 1];
    port->dev = device;
    port->num = port_num;
    /* Directory structure:
     * iov -
     *   port num -
     *  admin_guids
     *  gids (operational)
     *  mcg_table
     */
    port->dentr_ar = kzalloc(sizeof (struct mlx4_ib_iov_sysfs_attr_ar),
                 GFP_KERNEL);
    if (!port->dentr_ar) {
        ret = -ENOMEM;
        goto err;
    }
    sprintf(buff, "%d", port_num);
    port->cur_port = kobject_create_and_add(buff,
                 kobject_get(device->ports_parent));
    if (!port->cur_port) {
        ret = -ENOMEM;
        goto kobj_create_err;
    }
    /* admin GUIDs */
    port->admin_alias_parent = kobject_create_and_add("admin_guids",
                          kobject_get(port->cur_port));
    if (!port->admin_alias_parent) {
        ret = -ENOMEM;
        goto err_admin_guids;
    }
    for (i = 0 ; i < attr.gid_tbl_len; i++) {
        sprintf(buff, "%d", i);
        port->dentr_ar->dentries[i].entry_num = i;
        ret = create_sysfs_entry(port, &port->dentr_ar->dentries[i],
                      buff, port->admin_alias_parent,
                      show_admin_alias_guid, store_admin_alias_guid);
        if (ret)
            goto err_admin_alias_parent;
    }

    /* gids subdirectory (operational gids) */
    port->gids_parent = kobject_create_and_add("gids",
                          kobject_get(port->cur_port));
    if (!port->gids_parent) {
        ret = -ENOMEM;
        goto err_gids;
    }

    for (i = 0 ; i < attr.gid_tbl_len; i++) {
        sprintf(buff, "%d", i);
        port->dentr_ar->dentries[attr.gid_tbl_len + i].entry_num = i;
        ret = create_sysfs_entry(port,
                     &port->dentr_ar->dentries[attr.gid_tbl_len + i],
                     buff,
                     port->gids_parent, show_port_gid, NULL);
        if (ret)
            goto err_gids_parent;
    }

    /* physical port pkey table */
    port->pkeys_parent =
        kobject_create_and_add("pkeys", kobject_get(port->cur_port));
    if (!port->pkeys_parent) {
        ret = -ENOMEM;
        goto err_pkeys;
    }

    for (i = 0 ; i < attr.pkey_tbl_len; i++) {
        sprintf(buff, "%d", i);
        port->dentr_ar->dentries[2 * attr.gid_tbl_len + i].entry_num = i;
        ret = create_sysfs_entry(port,
                     &port->dentr_ar->dentries[2 * attr.gid_tbl_len + i],
                     buff, port->pkeys_parent,
                     show_phys_port_pkey, NULL);
        if (ret)
            goto err_pkeys_parent;
    }

    /* MCGs table */
    port->mcgs_parent =
        kobject_create_and_add("mcgs", kobject_get(port->cur_port));
    if (!port->mcgs_parent) {
        ret = -ENOMEM;
        goto err_mcgs;
    }
    return 0;

err_mcgs:
    kobject_put(port->cur_port);

err_pkeys_parent:
    kobject_put(port->pkeys_parent);

err_pkeys:
    kobject_put(port->cur_port);

err_gids_parent:
    kobject_put(port->gids_parent);

err_gids:
    kobject_put(port->cur_port);

err_admin_alias_parent:
    kobject_put(port->admin_alias_parent);

err_admin_guids:
    kobject_put(port->cur_port);
    kobject_put(port->cur_port); /* once more for create_and_add buff */

kobj_create_err:
    kobject_put(device->ports_parent);
    kfree(port->dentr_ar);

err:
    pr_err("add_port_entries FAILED: for port:%d, error: %d\n",
           port_num, ret);
    return ret;
}

static void get_name(struct mlx4_ib_dev *dev, char *name, int i, int max)
{
    char base_name[9];

    /* pci_name format is: bus:dev:func -> xxxx:yy:zz.n */
    strlcpy(name, pci_name(dev->dev->pdev), max);
    strncpy(base_name, name, 8); /*till xxxx:yy:*/
    base_name[8] = '\0';
    /* with no ARI only 3 last bits are used so when the fn is higher than 8
     * need to add it to the dev num, so count in the last number will be
     * modulo 8 */
    sprintf(name, "%s%.2d.%d", base_name, (i/8), (i%8));
}

struct mlx4_port {
    struct kobject         kobj;
    struct mlx4_ib_dev    *dev;
    struct attribute_group pkey_group;
    struct attribute_group gid_group;
    u8                     port_num;
    int            slave;
};


static void mlx4_port_release(struct kobject *kobj)
{
    struct mlx4_port *p = container_of(kobj, struct mlx4_port, kobj);
    struct attribute *a;
    int i;

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

struct port_attribute {
    struct attribute attr;
    ssize_t (*show)(struct mlx4_port *, struct port_attribute *, char *buf);
    ssize_t (*store)(struct mlx4_port *, struct port_attribute *,
             const char *buf, size_t count);
};

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 mlx4_port *p = container_of(kobj, struct mlx4_port, kobj);

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

static ssize_t port_attr_store(struct kobject *kobj,
                   struct attribute *attr,
                   const char *buf, size_t size)
{
    struct port_attribute *port_attr =
        container_of(attr, struct port_attribute, attr);
    struct mlx4_port *p = container_of(kobj, struct mlx4_port, kobj);

    if (!port_attr->store)
        return -EIO;
    return port_attr->store(p, port_attr, buf, size);
}

static const struct sysfs_ops port_sysfs_ops = {
    .show = port_attr_show,
    .store = port_attr_store,
};

static struct kobj_type port_type = {
    .release    = mlx4_port_release,
    .sysfs_ops  = &port_sysfs_ops,
};

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

static ssize_t show_port_pkey(struct mlx4_port *p, struct port_attribute *attr,
                  char *buf)
{
    struct port_table_attribute *tab_attr =
        container_of(attr, struct port_table_attribute, attr);
    ssize_t ret = -ENODEV;

    if (p->dev->pkeys.virt2phys_pkey[p->slave][p->port_num - 1][tab_attr->index] >=
        (p->dev->dev->caps.pkey_table_len[p->port_num]))
        ret = sprintf(buf, "none\n");
    else
        ret = sprintf(buf, "%d\n",
                  p->dev->pkeys.virt2phys_pkey[p->slave]
                  [p->port_num - 1][tab_attr->index]);
    return ret;
}

static ssize_t store_port_pkey(struct mlx4_port *p, struct port_attribute *attr,
                   const char *buf, size_t count)
{
    struct port_table_attribute *tab_attr =
        container_of(attr, struct port_table_attribute, attr);
    int idx;
    int err;

    /* do not allow remapping Dom0 virtual pkey table */
    if (p->slave == mlx4_master_func_num(p->dev->dev))
        return -EINVAL;

    if (!strncasecmp(buf, "no", 2))
        idx = p->dev->dev->phys_caps.pkey_phys_table_len[p->port_num] - 1;
    else if (sscanf(buf, "%i", &idx) != 1 ||
         idx >= p->dev->dev->caps.pkey_table_len[p->port_num] ||
         idx < 0)
        return -EINVAL;

    p->dev->pkeys.virt2phys_pkey[p->slave][p->port_num - 1]
                    [tab_attr->index] = idx;
    mlx4_sync_pkey_table(p->dev->dev, p->slave, p->port_num,
                 tab_attr->index, idx);
    err = mlx4_gen_pkey_eqe(p->dev->dev, p->slave, p->port_num);
    if (err) {
        pr_err("mlx4_gen_pkey_eqe failed for slave %d,"
               " port %d, index %d\n", p->slave, p->port_num, idx);
        return err;
    }
    return count;
}

static ssize_t show_port_gid_idx(struct mlx4_port *p,
                 struct port_attribute *attr, char *buf)
{
    return sprintf(buf, "%d\n", p->slave);
}

static struct attribute **
alloc_group_attrs(ssize_t (*show)(struct mlx4_port *,
                  struct port_attribute *, char *buf),
          ssize_t (*store)(struct mlx4_port *, struct port_attribute *,
                   const char *buf, size_t count),
          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;
        }
        sysfs_attr_init(&element->attr.attr);
        element->attr.attr.name  = element->name;
        if (store) {
            element->attr.attr.mode  = S_IWUSR | S_IRUGO;
            element->attr.store  = store;
        } else
            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 mlx4_ib_dev *dev, int port_num, int slave)
{
    struct mlx4_port *p;
    int i;
    int ret;

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

    p->dev = dev;
    p->port_num = port_num;
    p->slave = slave;

    ret = kobject_init_and_add(&p->kobj, &port_type,
                   kobject_get(dev->dev_ports_parent[slave]),
                   "%d", port_num);
    if (ret)
        goto err_alloc;

    p->pkey_group.name  = "pkey_idx";
    p->pkey_group.attrs =
        alloc_group_attrs(show_port_pkey, store_port_pkey,
                  dev->dev->caps.pkey_table_len[port_num]);
    if (!p->pkey_group.attrs)
        goto err_alloc;

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

    p->gid_group.name  = "gid_idx";
    p->gid_group.attrs = alloc_group_attrs(show_port_gid_idx, NULL, 1);
    if (!p->gid_group.attrs)
        goto err_free_pkey;

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

    list_add_tail(&p->kobj.entry, &dev->pkeys.pkey_port_list[slave]);
    return 0;

err_free_gid:
    kfree(p->gid_group.attrs[0]);
    kfree(p->gid_group.attrs);

err_free_pkey:
    for (i = 0; i < dev->dev->caps.pkey_table_len[port_num]; ++i)
        kfree(p->pkey_group.attrs[i]);
    kfree(p->pkey_group.attrs);

err_alloc:
    kobject_put(dev->dev_ports_parent[slave]);
    kfree(p);
    return ret;
}

static int register_one_pkey_tree(struct mlx4_ib_dev *dev, int slave)
{
    char name[32];
    int err;
    int port;
    struct kobject *p, *t;
    struct mlx4_port *mport;

    get_name(dev, name, slave, sizeof name);

    dev->pkeys.device_parent[slave] =
        kobject_create_and_add(name, kobject_get(dev->iov_parent));

    if (!dev->pkeys.device_parent[slave]) {
        err = -ENOMEM;
        goto fail_dev;
    }

    INIT_LIST_HEAD(&dev->pkeys.pkey_port_list[slave]);

    dev->dev_ports_parent[slave] =
        kobject_create_and_add("ports",
                       kobject_get(dev->pkeys.device_parent[slave]));

    if (!dev->dev_ports_parent[slave]) {
        err = -ENOMEM;
        goto err_ports;
    }

    for (port = 1; port <= dev->dev->caps.num_ports; ++port) {
        err = add_port(dev, port, slave);
        if (err)
            goto err_add;
    }
    return 0;

err_add:
    list_for_each_entry_safe(p, t,
                 &dev->pkeys.pkey_port_list[slave],
                 entry) {
        list_del(&p->entry);
        mport = container_of(p, struct mlx4_port, kobj);
        sysfs_remove_group(p, &mport->pkey_group);
        sysfs_remove_group(p, &mport->gid_group);
        kobject_put(p);
    }
    kobject_put(dev->dev_ports_parent[slave]);

err_ports:
    kobject_put(dev->pkeys.device_parent[slave]);
    /* extra put for the device_parent create_and_add */
    kobject_put(dev->pkeys.device_parent[slave]);

fail_dev:
    kobject_put(dev->iov_parent);
    return err;
}

static int register_pkey_tree(struct mlx4_ib_dev *device)
{
    int i;

    if (!mlx4_is_master(device->dev))
        return 0;

    for (i = 0; i <= device->dev->num_vfs; ++i)
        register_one_pkey_tree(device, i);

    return 0;
}

static void unregister_pkey_tree(struct mlx4_ib_dev *device)
{
    int slave;
    struct kobject *p, *t;
    struct mlx4_port *port;

    if (!mlx4_is_master(device->dev))
        return;

    for (slave = device->dev->num_vfs; slave >= 0; --slave) {
        list_for_each_entry_safe(p, t,
                     &device->pkeys.pkey_port_list[slave],
                     entry) {
            list_del(&p->entry);
            port = container_of(p, struct mlx4_port, kobj);
            sysfs_remove_group(p, &port->pkey_group);
            sysfs_remove_group(p, &port->gid_group);
            kobject_put(p);
            kobject_put(device->dev_ports_parent[slave]);
        }
        kobject_put(device->dev_ports_parent[slave]);
        kobject_put(device->pkeys.device_parent[slave]);
        kobject_put(device->pkeys.device_parent[slave]);
        kobject_put(device->iov_parent);
    }
}

int mlx4_ib_device_register_sysfs(struct mlx4_ib_dev *dev)
{
    int i;
    int ret = 0;

    if (!mlx4_is_master(dev->dev))
        return 0;

    dev->iov_parent =
        kobject_create_and_add("iov",
                       kobject_get(dev->ib_dev.ports_parent->parent));
    if (!dev->iov_parent) {
        ret = -ENOMEM;
        goto err;
    }
    dev->ports_parent =
        kobject_create_and_add("ports",
                       kobject_get(dev->iov_parent));
    if (!dev->iov_parent) {
        ret = -ENOMEM;
        goto err_ports;
    }

    for (i = 1; i <= dev->ib_dev.phys_port_cnt; ++i) {
        ret = add_port_entries(dev, i);
        if (ret)
            goto err_add_entries;
    }

    ret = register_pkey_tree(dev);
    if (ret)
        goto err_add_entries;
    return 0;

err_add_entries:
    kobject_put(dev->ports_parent);

err_ports:
    kobject_put(dev->iov_parent);
err:
    kobject_put(dev->ib_dev.ports_parent->parent);
    pr_err("mlx4_ib_device_register_sysfs error (%d)\n", ret);
    return ret;
}

static void unregister_alias_guid_tree(struct mlx4_ib_dev *device)
{
    struct mlx4_ib_iov_port *p;
    int i;

    if (!mlx4_is_master(device->dev))
        return;

    for (i = 0; i < device->dev->caps.num_ports; i++) {
        p = &device->iov_ports[i];
        kobject_put(p->admin_alias_parent);
        kobject_put(p->gids_parent);
        kobject_put(p->pkeys_parent);
        kobject_put(p->mcgs_parent);
        kobject_put(p->cur_port);
        kobject_put(p->cur_port);
        kobject_put(p->cur_port);
        kobject_put(p->cur_port);
        kobject_put(p->cur_port);
        kobject_put(p->dev->ports_parent);
        kfree(p->dentr_ar);
    }
}

void mlx4_ib_device_unregister_sysfs(struct mlx4_ib_dev *device)
{
    unregister_alias_guid_tree(device);
    unregister_pkey_tree(device);
    kobject_put(device->ports_parent);
    kobject_put(device->iov_parent);
    kobject_put(device->iov_parent);
    kobject_put(device->ib_dev.ports_parent->parent);
}