From: Ursula Braun <ubraun@linux.ibm.com>
Date: Wed, 9 Oct 2019 10:07:46 +0200
Subject: net/smc: no new connections on disappearing devices
Git-commit: c3d9494e68c4a5d23227ede822fda9bd68bef8e3
Patch-mainline: v5.5-rc1
References: jsc#SLE-7395
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
include/net/smc.h | 1 +
net/smc/smc_core.c | 23 +++++++++++++++++++++++
net/smc/smc_ib.c | 15 +++++++++++++--
net/smc/smc_ib.h | 1 +
net/smc/smc_ism.c | 3 +++
net/smc/smc_pnet.c | 5 ++++-
6 files changed, 45 insertions(+), 3 deletions(-)
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -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,
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1063,6 +1063,27 @@ int smc_rmb_rtoken_handling(struct smc_c
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)
{
@@ -1070,6 +1091,8 @@ 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);
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -242,8 +242,12 @@ static void smc_ib_port_event_work(struc
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(
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(
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(stru
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;
--- a/net/smc/smc_ib.h
+++ b/net/smc/smc_ib.h
@@ -47,6 +47,7 @@ struct smc_ib_device { /* ib-device i
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;
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -315,6 +315,7 @@ void smcd_unregister_dev(struct smcd_dev
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 *
{
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)
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -779,6 +779,7 @@ static void smc_pnet_find_rdma_dev(struc
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;
@@ -818,6 +819,7 @@ static void smc_pnet_find_roce_by_pnetid
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;
@@ -844,7 +846,8 @@ static void smc_pnet_find_ism_by_pnetid(
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;
}