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s390/qeth: defer IPv6 address notifier events 

The inet6addr_chain is atomic. So instead of starting the cmd IO for
SETIP / DELIP straight from the notifier callback, run it from a
workqueue. This is the last step towards removal of cmd IO completion
polling.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-03-28 16:39:22 +01:00 committed by David S. Miller
parent 05a1785134
commit 7686e4b6ef
3 changed files with 57 additions and 7 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -774,6 +774,7 @@ struct qeth_card {
struct qeth_card_options options;
struct workqueue_struct *event_wq;
struct workqueue_struct *cmd_wq;
wait_queue_head_t wait_q;
unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
DECLARE_HASHTABLE(mac_htable, 4);

3
drivers/s390/net/qeth_core_main.c
View File

@ -1450,7 +1450,8 @@ static struct qeth_card *qeth_alloc_card(struct ccwgroup_device *gdev)
CARD_WDEV(card) = gdev->cdev[1];
CARD_DDEV(card) = gdev->cdev[2];
card->event_wq = alloc_ordered_workqueue("%s", 0, dev_name(&gdev->dev));
card->event_wq = alloc_ordered_workqueue("%s_event", 0,
dev_name(&gdev->dev));
if (!card->event_wq)
goto out_wq;
if (qeth_setup_channel(&card->read, true))

60
drivers/s390/net/qeth_l3_main.c
View File

@ -2267,11 +2267,17 @@ static int qeth_l3_probe_device(struct ccwgroup_device *gdev)
int rc;
hash_init(card->ip_htable);
card->cmd_wq = alloc_ordered_workqueue("%s_cmd", 0,
dev_name(&gdev->dev));
if (!card->cmd_wq)
return -ENOMEM;
if (gdev->dev.type == &qeth_generic_devtype) {
rc = qeth_l3_create_device_attributes(&gdev->dev);
if (rc)
if (rc) {
destroy_workqueue(card->cmd_wq);
return rc;
}
}
hash_init(card->ip_mc_htable);
@ -2295,6 +2301,9 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
cancel_work_sync(&card->close_dev_work);
if (qeth_netdev_is_registered(card->dev))
unregister_netdev(card->dev);
flush_workqueue(card->cmd_wq);
destroy_workqueue(card->cmd_wq);
qeth_l3_clear_ip_htable(card, 0);
qeth_l3_clear_ipato_list(card);
}
@ -2542,6 +2551,30 @@ static int qeth_l3_handle_ip_event(struct qeth_card *card,
}
}
struct qeth_l3_ip_event_work {
struct work_struct work;
struct qeth_card *card;
struct qeth_ipaddr addr;
};
#define to_ip_work(w) container_of((w), struct qeth_l3_ip_event_work, work)
static void qeth_l3_add_ip_worker(struct work_struct *work)
{
struct qeth_l3_ip_event_work *ip_work = to_ip_work(work);
qeth_l3_modify_ip(ip_work->card, &ip_work->addr, true);
kfree(work);
}
static void qeth_l3_delete_ip_worker(struct work_struct *work)
{
struct qeth_l3_ip_event_work *ip_work = to_ip_work(work);
qeth_l3_modify_ip(ip_work->card, &ip_work->addr, false);
kfree(work);
}
static struct qeth_card *qeth_l3_get_card_from_dev(struct net_device *dev)
{
if (is_vlan_dev(dev))
@ -2586,9 +2619,12 @@ static int qeth_l3_ip6_event(struct notifier_block *this,
{
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct net_device *dev = ifa->idev->dev;
struct qeth_ipaddr addr;
struct qeth_l3_ip_event_work *ip_work;
struct qeth_card *card;
if (event != NETDEV_UP && event != NETDEV_DOWN)
return NOTIFY_DONE;
card = qeth_l3_get_card_from_dev(dev);
if (!card)
return NOTIFY_DONE;
@ -2596,11 +2632,23 @@ static int qeth_l3_ip6_event(struct notifier_block *this,
if (!qeth_is_supported(card, IPA_IPV6))
return NOTIFY_DONE;
qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV6);
addr.u.a6.addr = ifa->addr;
addr.u.a6.pfxlen = ifa->prefix_len;
ip_work = kmalloc(sizeof(*ip_work), GFP_ATOMIC);
if (!ip_work)
return NOTIFY_DONE;
return qeth_l3_handle_ip_event(card, &addr, event);
if (event == NETDEV_UP)
INIT_WORK(&ip_work->work, qeth_l3_add_ip_worker);
else
INIT_WORK(&ip_work->work, qeth_l3_delete_ip_worker);
ip_work->card = card;
qeth_l3_init_ipaddr(&ip_work->addr, QETH_IP_TYPE_NORMAL,
QETH_PROT_IPV6);
ip_work->addr.u.a6.addr = ifa->addr;
ip_work->addr.u.a6.pfxlen = ifa->prefix_len;
queue_work(card->cmd_wq, &ip_work->work);
return NOTIFY_OK;
}
static struct notifier_block qeth_l3_ip6_notifier = {