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authorWen Gu <guwen@linux.alibaba.com>2023-12-19 17:26:15 +0300
committerDavid S. Miller <davem@davemloft.net>2023-12-26 23:24:33 +0300
commitc6b8b8eb49904018e22e4e4b1fa502e57dc747d9 (patch)
treee10baa2e16ec377aab86dfb264fb613b54d00970 /net
parent01fd1617dbc6f558efd1811f2bc433659d1e8304 (diff)
downloadlinux-c6b8b8eb49904018e22e4e4b1fa502e57dc747d9.tar.xz
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>
Diffstat (limited to 'net')
-rw-r--r--net/smc/smc_clc.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index b43be3cafdcc..9a13709bea1c 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 @@ err:
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;
}
@@ -1328,7 +1338,11 @@ 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)