// SPDX-License-Identifier: GPL-2.0
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Generic netlink support functions to interact with SMC module
 *
 *  Copyright IBM Corp. 2020
 *
 *  Author(s):  Guvenc Gulce <guvenc@linux.ibm.com>
 */

#include <linux/module.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/mutex.h>
#include <linux/if.h>
#include <linux/smc.h>

#include "smc_core.h"
#include "smc_ism.h"
#include "smc_ib.h"
#include "smc_clc.h"
#include "smc_stats.h"
#include "smc_netlink.h"

const struct nla_policy
smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
        [SMC_NLA_EID_TABLE_UNSPEC]      = { .type = NLA_UNSPEC },
        [SMC_NLA_EID_TABLE_ENTRY]       = { .type = NLA_STRING,
                                            .len = SMC_MAX_EID_LEN,
                                          },
};

#define SMC_CMD_MAX_ATTR 1
/* SMC_GENL generic netlink operation definition */
static const struct genl_ops smc_gen_nl_ops[] = {
        {
                .cmd = SMC_NETLINK_GET_SYS_INFO,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_get_sys_info,
        },
        {
                .cmd = SMC_NETLINK_GET_LGR_SMCR,
                /* can be retrieved by unprivileged users */
                .dumpit = smcr_nl_get_lgr,
        },
        {
                .cmd = SMC_NETLINK_GET_LINK_SMCR,
                /* can be retrieved by unprivileged users */
                .dumpit = smcr_nl_get_link,
        },
        {
                .cmd = SMC_NETLINK_GET_LGR_SMCD,
                /* can be retrieved by unprivileged users */
                .dumpit = smcd_nl_get_lgr,
        },
        {
                .cmd = SMC_NETLINK_GET_DEV_SMCD,
                /* can be retrieved by unprivileged users */
                .dumpit = smcd_nl_get_device,
        },
        {
                .cmd = SMC_NETLINK_GET_DEV_SMCR,
                /* can be retrieved by unprivileged users */
                .dumpit = smcr_nl_get_device,
        },
        {
                .cmd = SMC_NETLINK_GET_STATS,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_get_stats,
        },
        {
                .cmd = SMC_NETLINK_GET_FBACK_STATS,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_get_fback_stats,
        },
        {
                .cmd = SMC_NETLINK_DUMP_UEID,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_dump_ueid,
        },
        {
                .cmd = SMC_NETLINK_ADD_UEID,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_add_ueid,
                .policy = smc_gen_ueid_policy,
        },
        {
                .cmd = SMC_NETLINK_REMOVE_UEID,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_remove_ueid,
                .policy = smc_gen_ueid_policy,
        },
        {
                .cmd = SMC_NETLINK_FLUSH_UEID,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_flush_ueid,
        },
        {
                .cmd = SMC_NETLINK_DUMP_SEID,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_dump_seid,
        },
        {
                .cmd = SMC_NETLINK_ENABLE_SEID,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_enable_seid,
        },
        {
                .cmd = SMC_NETLINK_DISABLE_SEID,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_disable_seid,
        },
        {
                .cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
                /* can be retrieved by unprivileged users */
                .dumpit = smc_nl_dump_hs_limitation,
        },
        {
                .cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_enable_hs_limitation,
        },
        {
                .cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
                .flags = GENL_ADMIN_PERM,
                .doit = smc_nl_disable_hs_limitation,
        },
};

static const struct nla_policy smc_gen_nl_policy[2] = {
        [SMC_CMD_MAX_ATTR]      = { .type = NLA_REJECT, },
};

/* SMC_GENL family definition */
struct genl_family smc_gen_nl_family __ro_after_init = {
        .hdrsize =      0,
        .name =         SMC_GENL_FAMILY_NAME,
        .version =      SMC_GENL_FAMILY_VERSION,
        .maxattr =      SMC_CMD_MAX_ATTR,
        .policy =       smc_gen_nl_policy,
        .netnsok =      true,
        .module =       THIS_MODULE,
        .ops =          smc_gen_nl_ops,
        .n_ops =        ARRAY_SIZE(smc_gen_nl_ops),
        .resv_start_op = SMC_NETLINK_DISABLE_HS_LIMITATION + 1,
};

int __init smc_nl_init(void)
{
        return genl_register_family(&smc_gen_nl_family);
}

void smc_nl_exit(void)
{
        genl_unregister_family(&smc_gen_nl_family);
}