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authorYishai Hadas <yishaih@mellanox.com>2015-08-13 18:32:05 +0300
committerDoug Ledford <dledford@redhat.com>2015-08-30 18:12:40 -0400
commit036b10635739ffd030246eedde3d67f724800177 (patch)
treeaf17a61bcb0987dd9671c9ff694303b21d94a1a7 /include/rdma
parent057aec0d23f750b27f0bb92d2606871f60417e0a (diff)
IB/uverbs: Enable device removal when there are active user space applications
Enables the uverbs_remove_one to succeed despite the fact that there are running IB applications working with the given ib device. This functionality enables a HW device to be unbind/reset despite the fact that there are running user space applications using it. It exposes a new IB kernel API named 'disassociate_ucontext' which lets a driver detaching its HW resources from a given user context without crashing/terminating the application. In case a driver implemented the above API and registered with ib_uverb there will be no dependency between its device to its uverbs_device. Upon calling remove_one of ib_uverbs the call should return after disassociating the open HW resources without waiting to clients disconnecting. In case driver didn't implement this API there will be no change to current behaviour and uverbs_remove_one will return only when last client has disconnected and reference count on uverbs device became 0. In case the lower driver device was removed any application will continue working over some zombie HCA, further calls will ended with an immediate error. Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_verbs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 128abf2888ab..40b83f412d24 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1769,6 +1769,7 @@ struct ib_device {
int (*destroy_flow)(struct ib_flow *flow_id);
int (*check_mr_status)(struct ib_mr *mr, u32 check_mask,
struct ib_mr_status *mr_status);
+ void (*disassociate_ucontext)(struct ib_ucontext *ibcontext);
struct ib_dma_mapping_ops *dma_ops;

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