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net/smc: disable SEID on non-s390 archs where virtual ISM may be used
The system EID (SEID) is an internal EID used by SMC-D to represent the s390 physical machine that OS is executing on. On s390 architecture, it predefined by fixed string and part of cpuid and is enabled regardless of whether underlay device is virtual ISM or platform firmware ISM. However on non-s390 architectures where SMC-D can be used with virtual ISM devices, there is no similar information to identify physical machines, especially in virtualization scenarios. So in such cases, SEID is forcibly disabled and the user-defined UEID will be used to represent the communicable space. Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Reviewed-and-tested-by: Wenjia Zhang <wenjia@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 14 additions and 0 deletions
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@ -155,10 +155,12 @@ static int smc_clc_ueid_remove(char *ueid)
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rc = 0;
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}
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}
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#if IS_ENABLED(CONFIG_S390)
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if (!rc && !smc_clc_eid_table.ueid_cnt) {
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smc_clc_eid_table.seid_enabled = 1;
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rc = -EAGAIN; /* indicate success and enabling of seid */
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}
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#endif
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write_unlock(&smc_clc_eid_table.lock);
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return rc;
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}
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@ -273,22 +275,30 @@ int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
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int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
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{
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#if IS_ENABLED(CONFIG_S390)
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write_lock(&smc_clc_eid_table.lock);
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smc_clc_eid_table.seid_enabled = 1;
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write_unlock(&smc_clc_eid_table.lock);
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return 0;
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#else
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return -EOPNOTSUPP;
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#endif
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}
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int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
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{
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int rc = 0;
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#if IS_ENABLED(CONFIG_S390)
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write_lock(&smc_clc_eid_table.lock);
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if (!smc_clc_eid_table.ueid_cnt)
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rc = -ENOENT;
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else
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smc_clc_eid_table.seid_enabled = 0;
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write_unlock(&smc_clc_eid_table.lock);
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#else
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rc = -EOPNOTSUPP;
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#endif
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return rc;
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}
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@ -1328,7 +1338,11 @@ void __init smc_clc_init(void)
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INIT_LIST_HEAD(&smc_clc_eid_table.list);
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rwlock_init(&smc_clc_eid_table.lock);
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smc_clc_eid_table.ueid_cnt = 0;
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#if IS_ENABLED(CONFIG_S390)
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smc_clc_eid_table.seid_enabled = 1;
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#else
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smc_clc_eid_table.seid_enabled = 0;
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#endif
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}
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void smc_clc_exit(void)
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