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![D. Wythe](/assets/img/avatar_default.png)
Although we can control SMC handshake limitation through socket options, which means that applications who need it must modify their code. It's quite troublesome for many existing applications. This patch modifies the global default value of SMC handshake limitation through netlink, providing a way to put constraint on handshake without modifies any code for applications. Suggested-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Reviewed-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
156 lines
3.5 KiB
C
156 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Generic netlink support functions to interact with SMC module
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*
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* Copyright IBM Corp. 2020
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*
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* Author(s): Guvenc Gulce <guvenc@linux.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/mutex.h>
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#include <linux/if.h>
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#include <linux/smc.h>
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#include "smc_core.h"
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#include "smc_ism.h"
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#include "smc_ib.h"
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#include "smc_clc.h"
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#include "smc_stats.h"
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#include "smc_netlink.h"
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const struct nla_policy
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smc_gen_ueid_policy[SMC_NLA_EID_TABLE_MAX + 1] = {
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[SMC_NLA_EID_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
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[SMC_NLA_EID_TABLE_ENTRY] = { .type = NLA_STRING,
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.len = SMC_MAX_EID_LEN,
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},
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};
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#define SMC_CMD_MAX_ATTR 1
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/* SMC_GENL generic netlink operation definition */
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static const struct genl_ops smc_gen_nl_ops[] = {
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{
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.cmd = SMC_NETLINK_GET_SYS_INFO,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_sys_info,
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},
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{
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.cmd = SMC_NETLINK_GET_LGR_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_lgr,
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},
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{
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.cmd = SMC_NETLINK_GET_LINK_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_link,
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},
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{
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.cmd = SMC_NETLINK_GET_LGR_SMCD,
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/* can be retrieved by unprivileged users */
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.dumpit = smcd_nl_get_lgr,
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},
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{
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.cmd = SMC_NETLINK_GET_DEV_SMCD,
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/* can be retrieved by unprivileged users */
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.dumpit = smcd_nl_get_device,
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},
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{
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.cmd = SMC_NETLINK_GET_DEV_SMCR,
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/* can be retrieved by unprivileged users */
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.dumpit = smcr_nl_get_device,
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},
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{
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.cmd = SMC_NETLINK_GET_STATS,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_stats,
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},
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{
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.cmd = SMC_NETLINK_GET_FBACK_STATS,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_get_fback_stats,
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},
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{
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.cmd = SMC_NETLINK_DUMP_UEID,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_ueid,
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},
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{
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.cmd = SMC_NETLINK_ADD_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_add_ueid,
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.policy = smc_gen_ueid_policy,
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},
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{
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.cmd = SMC_NETLINK_REMOVE_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_remove_ueid,
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.policy = smc_gen_ueid_policy,
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},
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{
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.cmd = SMC_NETLINK_FLUSH_UEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_flush_ueid,
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},
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{
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.cmd = SMC_NETLINK_DUMP_SEID,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_seid,
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},
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{
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.cmd = SMC_NETLINK_ENABLE_SEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_enable_seid,
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},
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{
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.cmd = SMC_NETLINK_DISABLE_SEID,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_disable_seid,
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},
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{
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.cmd = SMC_NETLINK_DUMP_HS_LIMITATION,
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/* can be retrieved by unprivileged users */
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.dumpit = smc_nl_dump_hs_limitation,
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},
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{
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.cmd = SMC_NETLINK_ENABLE_HS_LIMITATION,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_enable_hs_limitation,
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},
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{
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.cmd = SMC_NETLINK_DISABLE_HS_LIMITATION,
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.flags = GENL_ADMIN_PERM,
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.doit = smc_nl_disable_hs_limitation,
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},
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};
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static const struct nla_policy smc_gen_nl_policy[2] = {
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[SMC_CMD_MAX_ATTR] = { .type = NLA_REJECT, },
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};
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/* SMC_GENL family definition */
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struct genl_family smc_gen_nl_family __ro_after_init = {
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.hdrsize = 0,
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.name = SMC_GENL_FAMILY_NAME,
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.version = SMC_GENL_FAMILY_VERSION,
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.maxattr = SMC_CMD_MAX_ATTR,
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.policy = smc_gen_nl_policy,
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.netnsok = true,
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.module = THIS_MODULE,
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.ops = smc_gen_nl_ops,
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.n_ops = ARRAY_SIZE(smc_gen_nl_ops)
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};
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int __init smc_nl_init(void)
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{
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return genl_register_family(&smc_gen_nl_family);
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}
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void smc_nl_exit(void)
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{
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genl_unregister_family(&smc_gen_nl_family);
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}
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