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IB/core: Add ordered workqueue for RoCE GID management 

Currently the RoCE GID management uses the ib_wq to do add and delete new GIDs
according to the netdev events.

The ib_wq isn't an ordered workqueue and thus two work elements can be executed
concurrently which will result in unexpected behavior and inconsistency of the
GIDs cache content.

Example:
ifconfig eth1 11.11.11.11/16 up

This command will invoke the following netdev events in the following order:
1. NETDEV_UP
2. NETDEV_DOWN
3. NETDEV_UP

If (2) and (3) will be executed concurrently or in reverse order, instead of
having a new GID with 11.11.11.11 IP, we will end up without any new GIDs.

Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Majd Dibbiny 2017-05-30 09:58:06 +03:00 committed by Doug Ledford
parent 12cc1a0273
commit 8fe8bacb92
1 changed files with 9 additions and 2 deletions
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11
drivers/infiniband/core/roce_gid_mgmt.c
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@ -42,6 +42,8 @@
#include <rdma/ib_cache.h>
#include <rdma/ib_addr.h>
static struct workqueue_struct *gid_cache_wq;
enum gid_op_type {
GID_DEL = 0,
GID_ADD
@ -560,7 +562,7 @@ static int netdevice_queue_work(struct netdev_event_work_cmd *cmds,
}
INIT_WORK(&ndev_work->work, netdevice_event_work_handler);
queue_work(ib_wq, &ndev_work->work);
queue_work(gid_cache_wq, &ndev_work->work);
return NOTIFY_DONE;
}
@ -693,7 +695,7 @@ static int addr_event(struct notifier_block *this, unsigned long event,
dev_hold(ndev);
work->gid_attr.ndev = ndev;
queue_work(ib_wq, &work->work);
queue_work(gid_cache_wq, &work->work);
return NOTIFY_DONE;
}
@ -740,6 +742,10 @@ static struct notifier_block nb_inet6addr = {
int __init roce_gid_mgmt_init(void)
{
gid_cache_wq = alloc_ordered_workqueue("gid-cache-wq", 0);
if (!gid_cache_wq)
return -ENOMEM;
register_inetaddr_notifier(&nb_inetaddr);
if (IS_ENABLED(CONFIG_IPV6))
register_inet6addr_notifier(&nb_inet6addr);
@ -764,4 +770,5 @@ void __exit roce_gid_mgmt_cleanup(void)
* ib-core is removed, all physical devices have been removed,
* so no issue with remaining hardware contexts.
*/
destroy_workqueue(gid_cache_wq);
}