[PATCH net-next v4 07/18] net/smc: disable SEID on non-s390 architecture
From: Wen Gu <guwen@linux.alibaba.com>
Date: 2023-09-24 15:17:34
Also in:
linux-s390, lkml
Subsystem:
networking [general], shared memory communications (smc) sockets, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, D. Wythe, Dust Li, Sidraya Jayagond, Wenjia Zhang, Linus Torvalds
On s390 architecture SMC-Dv2 SEID is generated by ISMv2 device with partial cpuid. It is predefined and unique to represents the physical machine (CPC), the maximum communication space of SMC-D. On non-s390 archs like x86/64 or ARM, there is no similar information to identify physical machine, especially in virtualization scenarios like KVM, etc. 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> --- 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 aeb9643..deb43db 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; }
@@ -1292,7 +1302,11 @@ 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)
--
1.8.3.1