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authorUrsula Braun <ubraun@linux.ibm.com>2019-11-14 15:02:40 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-15 23:28:28 +0300
commit50c6b20eff8e10cb91f06262d8003a5d9be3dfab (patch)
tree8dcdfe1e3be31ee93946f19d3c710bffb97b17be
parent43da44c87678612f301d6ef6314064a6b52aad60 (diff)
downloadlinux-50c6b20eff8e10cb91f06262d8003a5d9be3dfab.tar.xz
net/smc: fix final cleanup sequence for SMCD devices
If peer announces shutdown, use the link group terminate worker for local cleanup of link groups and connections to terminate link group in proper context. Make sure link groups are cleaned up first before destroying the event queue of the SMCD device, because link group cleanup may raise events. Send signal shutdown only if peer has not done it already. Send socket abort or close only, if peer has not already announced shutdown. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/smc/smc_cdc.c3
-rw-r--r--net/smc/smc_core.c18
-rw-r--r--net/smc/smc_core.h2
-rw-r--r--net/smc/smc_ism.c7
4 files changed, 21 insertions, 9 deletions
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 7dc07ec2379b..164f1584861b 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -131,6 +131,9 @@ int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn)
{
int rc;
+ if (!conn->lgr || (conn->lgr->is_smcd && conn->lgr->peer_shutdown))
+ return -EPIPE;
+
if (conn->lgr->is_smcd) {
spin_lock_bh(&conn->send_lock);
rc = smcd_cdc_msg_send(conn);
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 0d92456729ab..561f069b30de 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -275,6 +275,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
lgr->smcd = ini->ism_dev;
lgr_list = &ini->ism_dev->lgr_list;
lgr_lock = &lgr->smcd->lgr_lock;
+ lgr->peer_shutdown = 0;
} else {
/* SMC-R specific settings */
get_device(&ini->ib_dev->ibdev->dev);
@@ -514,11 +515,16 @@ static void smc_conn_kill(struct smc_connection *conn)
{
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
- smc_close_abort(conn);
+ if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
+ conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
+ else
+ smc_close_abort(conn);
conn->killed = 1;
+ smc->sk.sk_err = ECONNABORTED;
smc_sk_wake_ups(smc);
+ if (conn->lgr->is_smcd)
+ tasklet_kill(&conn->rx_tsklet);
smc_lgr_unregister_conn(conn);
- smc->sk.sk_err = ECONNABORTED;
smc_close_active_abort(smc);
}
@@ -604,6 +610,8 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
if ((!peer_gid || lgr->peer_gid == peer_gid) &&
(vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
+ if (peer_gid) /* peer triggered termination */
+ lgr->peer_shutdown = 1;
list_move(&lgr->list, &lgr_free_list);
}
}
@@ -612,11 +620,7 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
/* cancel the regular free workers and actually free lgrs */
list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
list_del_init(&lgr->list);
- __smc_lgr_terminate(lgr);
- cancel_delayed_work_sync(&lgr->free_work);
- if (!peer_gid && vlan == VLAN_VID_MASK) /* dev terminated? */
- smc_ism_signal_shutdown(lgr);
- smc_lgr_free(lgr);
+ schedule_work(&lgr->terminate_work);
}
}
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index e6fd1ed42064..097ceba86caf 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -228,6 +228,8 @@ struct smc_link_group {
/* Peer GID (remote) */
struct smcd_dev *smcd;
/* ISM device for VLAN reg. */
+ u8 peer_shutdown : 1;
+ /* peer triggered shutdownn */
};
};
};
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index ee7340898cb4..18946e95a3be 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -226,6 +226,9 @@ int smc_ism_signal_shutdown(struct smc_link_group *lgr)
int rc;
union smcd_sw_event_info ev_info;
+ if (lgr->peer_shutdown)
+ return 0;
+
memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
ev_info.vlan_id = lgr->vlan_id;
ev_info.code = ISM_EVENT_REQUEST;
@@ -313,12 +316,12 @@ EXPORT_SYMBOL_GPL(smcd_register_dev);
void smcd_unregister_dev(struct smcd_dev *smcd)
{
spin_lock(&smcd_dev_list.lock);
- list_del(&smcd->list);
+ list_del_init(&smcd->list);
spin_unlock(&smcd_dev_list.lock);
smcd->going_away = 1;
+ smc_smcd_terminate(smcd, 0, VLAN_VID_MASK);
flush_workqueue(smcd->event_wq);
destroy_workqueue(smcd->event_wq);
- smc_smcd_terminate(smcd, 0, VLAN_VID_MASK);
device_del(&smcd->dev);
}