From: Wen Gu guwen@linux.alibaba.com
[ Upstream commit c6b8b8eb49904018e22e4e4b1fa502e57dc747d9 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- net/smc/smc_clc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c index 9b8999e2afca..867df4522815 100644 --- a/net/smc/smc_clc.c +++ b/net/smc/smc_clc.c @@ -155,10 +155,12 @@ static int smc_clc_ueid_remove(char *ueid) rc = 0; } } +#if IS_ENABLED(CONFIG_S390) if (!rc && !smc_clc_eid_table.ueid_cnt) { smc_clc_eid_table.seid_enabled = 1; rc = -EAGAIN; /* indicate success and enabling of seid */ } +#endif write_unlock(&smc_clc_eid_table.lock); return rc; } @@ -273,22 +275,30 @@ int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info) { +#if IS_ENABLED(CONFIG_S390) write_lock(&smc_clc_eid_table.lock); smc_clc_eid_table.seid_enabled = 1; write_unlock(&smc_clc_eid_table.lock); return 0; +#else + return -EOPNOTSUPP; +#endif }
int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info) { int rc = 0;
+#if IS_ENABLED(CONFIG_S390) write_lock(&smc_clc_eid_table.lock); if (!smc_clc_eid_table.ueid_cnt) rc = -ENOENT; else smc_clc_eid_table.seid_enabled = 0; write_unlock(&smc_clc_eid_table.lock); +#else + rc = -EOPNOTSUPP; +#endif return rc; }
@@ -1168,7 +1178,11 @@ void __init smc_clc_init(void) INIT_LIST_HEAD(&smc_clc_eid_table.list); rwlock_init(&smc_clc_eid_table.lock); smc_clc_eid_table.ueid_cnt = 0; +#if IS_ENABLED(CONFIG_S390) smc_clc_eid_table.seid_enabled = 1; +#else + smc_clc_eid_table.seid_enabled = 0; +#endif }
void smc_clc_exit(void)