* [PATCH rdma-rc 1/2] RDMA/uverbs: Do not discard the IB_EVENT_DEVICE_FATAL event
2020-05-07 6:33 [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic Leon Romanovsky
@ 2020-05-07 6:33 ` Leon Romanovsky
2020-05-07 6:33 ` [PATCH rdma-rc 2/2] RDMA/uverbs: Move IB_EVENT_DEVICE_FATAL to destroy_uobj Leon Romanovsky
2020-05-12 20:05 ` [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic Jason Gunthorpe
2 siblings, 0 replies; 4+ messages in thread
From: Leon Romanovsky @ 2020-05-07 6:33 UTC (permalink / raw)
To: Doug Ledford, Jason Gunthorpe; +Cc: linux-rdma, Yishai Hadas
From: Jason Gunthorpe <jgg@mellanox.com>
The commit below moved all of the destruction to the disassociate step and
cleaned up the event channel during destroy_uobj.
However, when ib_uverbs_free_hw_resources() pushes IB_EVENT_DEVICE_FATAL
and then immediately goes to destroy all uobjects this causes
ib_uverbs_free_event_queue() to discard the queued event if userspace
hasn't already read() it.
Unlike all other event queues async FD needs to defer the
ib_uverbs_free_event_queue() until FD release. This still unregisters the
handler from the IB device during disassociation.
Fixes: 3e032c0e92aa ("RDMA/core: Make ib_uverbs_async_event_file into a uobject")
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
drivers/infiniband/core/rdma_core.c | 3 ++-
drivers/infiniband/core/uverbs.h | 1 +
drivers/infiniband/core/uverbs_main.c | 2 +-
.../core/uverbs_std_types_async_fd.c | 26 ++++++++++++++++++-
4 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index 177333d8bcda..bf8e149d3191 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -459,7 +459,8 @@ alloc_begin_fd_uobject(const struct uverbs_api_object *obj,
struct ib_uobject *uobj;
struct file *filp;
- if (WARN_ON(fd_type->fops->release != &uverbs_uobject_fd_release))
+ if (WARN_ON(fd_type->fops->release != &uverbs_uobject_fd_release &&
+ fd_type->fops->release != &uverbs_async_event_release))
return ERR_PTR(-EINVAL);
new_fd = get_unused_fd_flags(O_CLOEXEC);
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 7df71983212d..2673cb1cd655 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -219,6 +219,7 @@ void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue);
void ib_uverbs_init_async_event_file(struct ib_uverbs_async_event_file *ev_file);
void ib_uverbs_free_event_queue(struct ib_uverbs_event_queue *event_queue);
void ib_uverbs_flow_resources_free(struct ib_uflow_resources *uflow_res);
+int uverbs_async_event_release(struct inode *inode, struct file *filp);
int ib_alloc_ucontext(struct uverbs_attr_bundle *attrs);
int ib_init_ucontext(struct uverbs_attr_bundle *attrs);
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 17fc25db0311..cb5b59123d8f 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -346,7 +346,7 @@ const struct file_operations uverbs_async_event_fops = {
.owner = THIS_MODULE,
.read = ib_uverbs_async_event_read,
.poll = ib_uverbs_async_event_poll,
- .release = uverbs_uobject_fd_release,
+ .release = uverbs_async_event_release,
.fasync = ib_uverbs_async_event_fasync,
.llseek = no_llseek,
};
diff --git a/drivers/infiniband/core/uverbs_std_types_async_fd.c b/drivers/infiniband/core/uverbs_std_types_async_fd.c
index 82ec0806b34b..462deb506b16 100644
--- a/drivers/infiniband/core/uverbs_std_types_async_fd.c
+++ b/drivers/infiniband/core/uverbs_std_types_async_fd.c
@@ -26,10 +26,34 @@ static int uverbs_async_event_destroy_uobj(struct ib_uobject *uobj,
container_of(uobj, struct ib_uverbs_async_event_file, uobj);
ib_unregister_event_handler(&event_file->event_handler);
- ib_uverbs_free_event_queue(&event_file->ev_queue);
return 0;
}
+int uverbs_async_event_release(struct inode *inode, struct file *filp)
+{
+ struct ib_uverbs_async_event_file *event_file;
+ struct ib_uobject *uobj = filp->private_data;
+ int ret;
+
+ if (!uobj)
+ return uverbs_uobject_fd_release(inode, filp);
+
+ event_file =
+ container_of(uobj, struct ib_uverbs_async_event_file, uobj);
+
+ /*
+ * The async event FD has to deliver IB_EVENT_DEVICE_FATAL even after
+ * disassociation, so cleaning the event list must only happen after
+ * release. The user knows it has reached the end of the event stream
+ * when it sees IB_EVENT_DEVICE_FATAL.
+ */
+ uverbs_uobject_get(uobj);
+ ret = uverbs_uobject_fd_release(inode, filp);
+ ib_uverbs_free_event_queue(&event_file->ev_queue);
+ uverbs_uobject_put(uobj);
+ return ret;
+}
+
DECLARE_UVERBS_NAMED_METHOD(
UVERBS_METHOD_ASYNC_EVENT_ALLOC,
UVERBS_ATTR_FD(UVERBS_ATTR_ASYNC_EVENT_ALLOC_FD_HANDLE,
--
2.26.2
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH rdma-rc 2/2] RDMA/uverbs: Move IB_EVENT_DEVICE_FATAL to destroy_uobj
2020-05-07 6:33 [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic Leon Romanovsky
2020-05-07 6:33 ` [PATCH rdma-rc 1/2] RDMA/uverbs: Do not discard the IB_EVENT_DEVICE_FATAL event Leon Romanovsky
@ 2020-05-07 6:33 ` Leon Romanovsky
2020-05-12 20:05 ` [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic Jason Gunthorpe
2 siblings, 0 replies; 4+ messages in thread
From: Leon Romanovsky @ 2020-05-07 6:33 UTC (permalink / raw)
To: Doug Ledford, Jason Gunthorpe; +Cc: linux-rdma, Yishai Hadas
From: Jason Gunthorpe <jgg@mellanox.com>
When multiple async FDs were allowed to exist the idea what for all
broadcast events to be delivered to all async FDs, however
IB_EVENT_DEVICE_FATAL was missed.
Instead of having ib_uverbs_free_hw_resources() special case the global
async_fd, have it cause the event during the uobject destruction. Every
async fd is now a uobject so simply generate the IB_EVENT_DEVICE_FATAL
while destroying the async fd uobject. This ensures every async FD gets a
copy of the event.
Fixes: d680e88e2013 ("RDMA/core: Add UVERBS_METHOD_ASYNC_EVENT_ALLOC")
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
drivers/infiniband/core/uverbs.h | 3 +++
drivers/infiniband/core/uverbs_main.c | 10 +++-------
drivers/infiniband/core/uverbs_std_types_async_fd.c | 4 ++++
3 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 2673cb1cd655..3d189c7ee59e 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -228,6 +228,9 @@ void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
struct ib_ucq_object *uobj);
void ib_uverbs_release_uevent(struct ib_uevent_object *uobj);
void ib_uverbs_release_file(struct kref *ref);
+void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
+ __u64 element, __u64 event,
+ struct list_head *obj_list, u32 *counter);
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index cb5b59123d8f..1bab8de14757 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -386,10 +386,9 @@ void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
}
-static void
-ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
- __u64 element, __u64 event, struct list_head *obj_list,
- u32 *counter)
+void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
+ __u64 element, __u64 event,
+ struct list_head *obj_list, u32 *counter)
{
struct ib_uverbs_event *entry;
unsigned long flags;
@@ -1187,9 +1186,6 @@ static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
*/
mutex_unlock(&uverbs_dev->lists_mutex);
- ib_uverbs_async_handler(READ_ONCE(file->async_file), 0,
- IB_EVENT_DEVICE_FATAL, NULL, NULL);
-
uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
kref_put(&file->ref, ib_uverbs_release_file);
diff --git a/drivers/infiniband/core/uverbs_std_types_async_fd.c b/drivers/infiniband/core/uverbs_std_types_async_fd.c
index 462deb506b16..61899eaf1f91 100644
--- a/drivers/infiniband/core/uverbs_std_types_async_fd.c
+++ b/drivers/infiniband/core/uverbs_std_types_async_fd.c
@@ -26,6 +26,10 @@ static int uverbs_async_event_destroy_uobj(struct ib_uobject *uobj,
container_of(uobj, struct ib_uverbs_async_event_file, uobj);
ib_unregister_event_handler(&event_file->event_handler);
+
+ if (why == RDMA_REMOVE_DRIVER_REMOVE)
+ ib_uverbs_async_handler(event_file, 0, IB_EVENT_DEVICE_FATAL,
+ NULL, NULL);
return 0;
}
--
2.26.2
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic
2020-05-07 6:33 [PATCH rdma-rc 0/2] Fixes to IB_EVENT_DEVICE_FATAL logic Leon Romanovsky
2020-05-07 6:33 ` [PATCH rdma-rc 1/2] RDMA/uverbs: Do not discard the IB_EVENT_DEVICE_FATAL event Leon Romanovsky
2020-05-07 6:33 ` [PATCH rdma-rc 2/2] RDMA/uverbs: Move IB_EVENT_DEVICE_FATAL to destroy_uobj Leon Romanovsky
@ 2020-05-12 20:05 ` Jason Gunthorpe
2 siblings, 0 replies; 4+ messages in thread
From: Jason Gunthorpe @ 2020-05-12 20:05 UTC (permalink / raw)
To: Leon Romanovsky
Cc: Doug Ledford, Leon Romanovsky, linux-kernel, linux-rdma, Yishai Hadas
On Thu, May 07, 2020 at 09:33:46AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@mellanox.com>
>
> Hi,
>
> Two changes, pretty straightforward.
>
> Thanks
>
> Jason Gunthorpe (2):
> RDMA/uverbs: Do not discard the IB_EVENT_DEVICE_FATAL event
> RDMA/uverbs: Move IB_EVENT_DEVICE_FATAL to destroy_uobj
Applied to for-rc
Jason
^ permalink raw reply [flat|nested] 4+ messages in thread