From: "D. Wythe" <alibuda@xxxxxxxxxxxxxxxxx>
As commit "net/smc: fix unexpected SMC_CLC_DECL_ERR_REGRMB error cause
by server" mentioned, it works only when all connection creations are
completely protected by smc_server_lgr_pending lock, since we already
cancel the lock, we need to re-fix the issues.
Fixes: 4940a1fdf31c ("net/smc: fix unexpected SMC_CLC_DECL_ERR_REGRMB error cause by server")
Signed-off-by: D. Wythe <alibuda@xxxxxxxxxxxxxxxxx>
---
net/smc/af_smc.c | 2 ++
net/smc/smc_core.c | 11 ++++++++---
net/smc/smc_core.h | 21 +++++++++++++++++++++
3 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index af4b0aa..c0842a9 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -2413,6 +2413,7 @@ static void smc_listen_work(struct work_struct *work)
if (rc)
goto out_unlock;
}
+ smc_conn_leave_rtoken_pending(new_smc, ini);
smc_conn_save_peer_info(new_smc, cclc);
smc_listen_out_connected(new_smc);
SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
@@ -2422,6 +2423,7 @@ static void smc_listen_work(struct work_struct *work)
if (ini->is_smcd)
mutex_unlock(&smc_server_lgr_pending);
out_decl:
+ smc_conn_leave_rtoken_pending(new_smc, ini);
smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
proposal_version);
out_free:
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index a3338cc..61a3854 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -2190,14 +2190,19 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
lgr->vlan_id == ini->vlan_id) &&
(role == SMC_CLNT || ini->is_smcd ||
(lgr->conns_num < SMC_RMBS_PER_LGR_MAX &&
- !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
+ (SMC_RMBS_PER_LGR_MAX -
+ bitmap_weight(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)
+ > atomic_read(&lgr->rtoken_pendings))))) {
/* link group found */
ini->first_contact_local = 0;
conn->lgr = lgr;
rc = smc_lgr_register_conn(conn, false);
write_unlock_bh(&lgr->conns_lock);
- if (!rc && delayed_work_pending(&lgr->free_work))
- cancel_delayed_work(&lgr->free_work);
+ if (!rc) {
+ smc_conn_enter_rtoken_pending(smc, ini);
+ if (delayed_work_pending(&lgr->free_work))
+ cancel_delayed_work(&lgr->free_work);
+ }
break;
}
write_unlock_bh(&lgr->conns_lock);
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 199f533..acc2869 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -293,6 +293,9 @@ struct smc_link_group {
struct rb_root conns_all; /* connection tree */
rwlock_t conns_lock; /* protects conns_all */
unsigned int conns_num; /* current # of connections */
+ atomic_t rtoken_pendings;/* number of connection that
+ * lgr assigned but no rtoken got yet
+ */
unsigned short vlan_id; /* vlan id of link group */
struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */
@@ -603,6 +606,24 @@ struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb);
int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
+static inline void smc_conn_enter_rtoken_pending(struct smc_sock *smc, struct smc_init_info *ini)
+{
+ struct smc_link_group *lgr;
+
+ lgr = smc->conn.lgr;
+ if (lgr && !ini->first_contact_local)
+ atomic_inc(&lgr->rtoken_pendings);
+}
+
+static inline void smc_conn_leave_rtoken_pending(struct smc_sock *smc, struct smc_init_info *ini)
+{
+ struct smc_link_group *lgr;
+
+ lgr = smc->conn.lgr;
+ if (lgr && !ini->first_contact_local)
+ atomic_dec(&lgr->rtoken_pendings);
+}
+
void smcr_lnk_cluster_on_lnk_state(struct smc_link *lnk);
static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
--
1.8.3.1
