On 24/09/2023 17:16, Wen Gu wrote:
This patch extracts v2-capable logic from the process of registering the
ISM device as an SMC-D device, so that the registration process of other
underlying devices can reuse it.
Signed-off-by: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
---
net/smc/smc_ism.c | 29 ++++++++++++++++++-----------
net/smc/smc_ism.h | 1 +
2 files changed, 19 insertions(+), 11 deletions(-)
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 455ae0a..8f1ba74 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -69,6 +69,22 @@ bool smc_ism_is_v2_capable(void)
return smc_ism_v2_capable;
}
+/* must be called under smcd_dev_list.mutex lock */
+void smc_ism_check_v2_capable(struct smcd_dev *smcd)
+{
+ u8 *system_eid = NULL;
+
+ if (smc_ism_v2_capable)
+ return;
+
+ system_eid = smcd->ops->get_system_eid();
+ if (smcd->ops->supports_v2()) {
+ smc_ism_v2_capable = true;
+ memcpy(smc_ism_v2_system_eid, system_eid,
+ SMC_MAX_EID_LEN);
+ }
+}
+
/* Set a connection using this DMBE. */
void smc_ism_set_conn(struct smc_connection *conn)
{
@@ -423,16 +439,7 @@ static void smcd_register_dev(struct ism_dev *ism)
smc_pnetid_by_table_smcd(smcd);
mutex_lock(&smcd_dev_list.mutex);
- if (list_empty(&smcd_dev_list.list)) {
- u8 *system_eid = NULL;
-
- system_eid = smcd->ops->get_system_eid();
- if (smcd->ops->supports_v2()) {
- smc_ism_v2_capable = true;
- memcpy(smc_ism_v2_system_eid, system_eid,
- SMC_MAX_EID_LEN);
- }
- }
+ smc_ism_check_v2_capable(smcd);
The list_empty check is omitted here which means the
smc_ism_check_v2_capable does not touch the list.
So i think the call could be placed prior the mutex_lock.
/* sort list: devices without pnetid before devices with pnetid */
if (smcd->pnetid[0])
list_add_tail(&smcd->list, &smcd_dev_list.list);
@@ -535,10 +542,10 @@ int smc_ism_init(void)
{
int rc = 0;
-#if IS_ENABLED(CONFIG_ISM)
smc_ism_v2_capable = false;
memset(smc_ism_v2_system_eid, 0, SMC_MAX_EID_LEN);
+#if IS_ENABLED(CONFIG_ISM)
rc = ism_register_client(&smc_ism_client);
#endif
return rc;
diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 832b2f4..14d2e77 100644
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -42,6 +42,7 @@ int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
void smc_ism_get_system_eid(u8 **eid);
u16 smc_ism_get_chid(struct smcd_dev *dev);
bool smc_ism_is_v2_capable(void);
+void smc_ism_check_v2_capable(struct smcd_dev *dev);
int smc_ism_init(void);
void smc_ism_exit(void);
int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
