mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-27 04:47:05 +00:00
net/smc: disable SEID on non-s390 archs where virtual ISM may be used
[ Upstream commit c6b8b8eb49
]
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>
This commit is contained in:
parent
d136385406
commit
57bd38eb97
1 changed files with 14 additions and 0 deletions
|
@ -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;
|
||||
}
|
||||
|
||||
|
@ -1269,7 +1279,11 @@ 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)
|
||||
|
|
Loading…
Reference in a new issue