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net/smc: no new connections on disappearing devices

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Add a "going_away" indication to ISM devices and IB ports and
avoid creation of new connections on such disappearing devices.

And do not handle ISM events if ISM device is disappearing.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Ursula Braun 2019-10-09 10:07:46 +02:00 committed by Jakub Kicinski
parent b3cb53c05f
commit c3d9494e68
6 changed files with 45 additions and 3 deletions
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1
include/net/smc.h
View file

@ -77,6 +77,7 @@ struct smcd_dev {
bool pnetid_by_user;
struct list_head lgr_list;
spinlock_t lgr_lock;
u8 going_away : 1;
};
struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,

23
net/smc/smc_core.c
View file

@ -1060,6 +1060,27 @@ int smc_rmb_rtoken_handling(struct smc_connection *conn,
return 0;
}
static void smc_core_going_away(void)
{
struct smc_ib_device *smcibdev;
struct smcd_dev *smcd;
spin_lock(&smc_ib_devices.lock);
list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
int i;
for (i = 0; i < SMC_MAX_PORTS; i++)
set_bit(i, smcibdev->ports_going_away);
}
spin_unlock(&smc_ib_devices.lock);
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(smcd, &smcd_dev_list.list, list) {
smcd->going_away = 1;
}
spin_unlock(&smcd_dev_list.lock);
}
/* Called (from smc_exit) when module is removed */
void smc_core_exit(void)
{
@ -1067,6 +1088,8 @@ void smc_core_exit(void)
LIST_HEAD(lgr_freeing_list);
struct smcd_dev *smcd;
smc_core_going_away();
spin_lock_bh(&smc_lgr_list.lock);
list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
spin_unlock_bh(&smc_lgr_list.lock);

15
net/smc/smc_ib.c
View file

@ -242,8 +242,12 @@ static void smc_ib_port_event_work(struct work_struct *work)
for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
smc_ib_remember_port_attr(smcibdev, port_idx + 1);
clear_bit(port_idx, &smcibdev->port_event_mask);
if (!smc_ib_port_active(smcibdev, port_idx + 1))
if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
set_bit(port_idx, smcibdev->ports_going_away);
smc_port_terminate(smcibdev, port_idx + 1);
} else {
clear_bit(port_idx, smcibdev->ports_going_away);
}
}
}
@ -259,8 +263,10 @@ static void smc_ib_global_event_handler(struct ib_event_handler *handler,
switch (ibevent->event) {
case IB_EVENT_DEVICE_FATAL:
/* terminate all ports on device */
for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++)
for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
set_bit(port_idx, &smcibdev->port_event_mask);
set_bit(port_idx, smcibdev->ports_going_away);
}
schedule_work(&smcibdev->port_event_work);
break;
case IB_EVENT_PORT_ERR:
@ -269,6 +275,10 @@ static void smc_ib_global_event_handler(struct ib_event_handler *handler,
port_idx = ibevent->element.port_num - 1;
if (port_idx < SMC_MAX_PORTS) {
set_bit(port_idx, &smcibdev->port_event_mask);
if (ibevent->event == IB_EVENT_PORT_ERR)
set_bit(port_idx, smcibdev->ports_going_away);
else if (ibevent->event == IB_EVENT_PORT_ACTIVE)
clear_bit(port_idx, smcibdev->ports_going_away);
schedule_work(&smcibdev->port_event_work);
}
break;
@ -307,6 +317,7 @@ static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
port_idx = ibevent->element.qp->port - 1;
if (port_idx < SMC_MAX_PORTS) {
set_bit(port_idx, &smcibdev->port_event_mask);
set_bit(port_idx, smcibdev->ports_going_away);
schedule_work(&smcibdev->port_event_work);
}
break;

1
net/smc/smc_ib.h
View file

@ -47,6 +47,7 @@ struct smc_ib_device { /* ib-device infos for smc */
u8 initialized : 1; /* ib dev CQ, evthdl done */
struct work_struct port_event_work;
unsigned long port_event_mask;
DECLARE_BITMAP(ports_going_away, SMC_MAX_PORTS);
};
struct smc_buf_desc;

3
net/smc/smc_ism.c
View file

@ -315,6 +315,7 @@ void smcd_unregister_dev(struct smcd_dev *smcd)
spin_lock(&smcd_dev_list.lock);
list_del(&smcd->list);
spin_unlock(&smcd_dev_list.lock);
smcd->going_away = 1;
flush_workqueue(smcd->event_wq);
destroy_workqueue(smcd->event_wq);
smc_smcd_terminate(smcd, 0, VLAN_VID_MASK);
@ -344,6 +345,8 @@ void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
{
struct smc_ism_event_work *wrk;
if (smcd->going_away)
return;
/* copy event to event work queue, and let it be handled there */
wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
if (!wrk)

5
net/smc/smc_pnet.c
View file

@ -781,6 +781,7 @@ static void smc_pnet_find_rdma_dev(struct net_device *netdev,
dev_put(ndev);
if (netdev == ndev &&
smc_ib_port_active(ibdev, i) &&
!test_bit(i - 1, ibdev->ports_going_away) &&
!smc_ib_determine_gid(ibdev, i, ini->vlan_id,
ini->ib_gid, NULL)) {
ini->ib_dev = ibdev;
@ -820,6 +821,7 @@ static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
continue;
if (smc_pnet_match(ibdev->pnetid[i - 1], ndev_pnetid) &&
smc_ib_port_active(ibdev, i) &&
!test_bit(i - 1, ibdev->ports_going_away) &&
!smc_ib_determine_gid(ibdev, i, ini->vlan_id,
ini->ib_gid, NULL)) {
ini->ib_dev = ibdev;
@ -846,7 +848,8 @@ static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
!ismdev->going_away) {
ini->ism_dev = ismdev;
break;
}