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  1. 01 Aug, 2018 9 commits
    • Jason Gunthorpe's avatar
      IB/uverbs: Do not pass struct ib_device to the ioctl methods · e83f0ecd
      Jason Gunthorpe authored 
      This does the same as the patch before, except for ioctl. The rules are
the same, but for the ioctl methods the core code handles setting up the
uobject.

- Retrieve the ib_dev from the uobject->context->device. This is
  safe under ioctl as the core has already done rdma_alloc_begin_uobject
  and so CREATE calls are entirely protected by the rwsem.
- Retrieve the ib_dev from uobject->object
- Call ib_uverbs_get_ucontext()
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      e83f0ecd
    • Jason Gunthorpe's avatar
      IB/uverbs: Do not pass struct ib_device to the write based methods · bbd51e88
      Jason Gunthorpe authored 
      This is a step to get rid of the global check for disassociation. In this
model, the ib_dev is not proven to be valid by the core code and cannot be
provided to the method. Instead, every method decides if it is able to
run after disassociation and obtains the ib_dev using one of three
different approaches:

- Call srcu_dereference on the udevice's ib_dev. As before, this means
  the method cannot be called after disassociation begins.
  (eg alloc ucontext)
- Retrieve the ib_dev from the ucontext, via ib_uverbs_get_ucontext()
- Retrieve the ib_dev from the uobject->object after checking
  under SRCU if disassociation has started (eg uobj_get)

Largely, the code is all ready for this, the main work is to provide a
ib_dev after calling uobj_alloc(). The few other places simply use
ib_uverbs_get_ucontext() to get the ib_dev.

This flexibility will let the next patches allow destroy to operate
after disassociation.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      bbd51e88
    • Jason Gunthorpe's avatar
      IB/uverbs: Lower the test for ongoing disassociation · cc2e14e6
      Jason Gunthorpe authored 
      Commands that are reading/writing to objects can test for an ongoing
disassociation during their initial call to rdma_lookup_get_uobject.  This
directly prevents all of these commands from conflicting with an ongoing
disassociation.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      cc2e14e6
    • Jason Gunthorpe's avatar
      IB/uverbs: Allow uobject allocation to work concurrently with disassociate · 1e857e65
      Jason Gunthorpe authored 
      After all the recent structural changes this is now straightforward, hold
the hw_destroy_rwsem across the entire uobject creation. We already take
this semaphore on the success path, so holding it a bit longer is not
going to change the performance.

After this change none of the create callbacks require the
disassociate_srcu lock to be correct.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      1e857e65
    • Jason Gunthorpe's avatar
      IB/uverbs: Allow RDMA_REMOVE_DESTROY to work concurrently with disassociate · 7452a3c7
      Jason Gunthorpe authored 
      After all the recent structural changes this is now straightfoward, hoist
the hw_destroy_rwsem up out of rdma_destroy_explicit and wrap it around
the uobject write lock as well as the destroy.

This is necessary as obtaining a write lock concurrently with
uverbs_destroy_ufile_hw() will cause malfunction.

After this change none of the destroy callbacks require the
disassociate_srcu lock to be correct.

This requires introducing a new lookup mode, UVERBS_LOOKUP_DESTROY as the
IOCTL interface needs to hold an unlocked kref until all command
verification is completed.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      7452a3c7
    • Jason Gunthorpe's avatar
      IB/uverbs: Convert 'bool exclusive' into an enum · 9867f5c6
      Jason Gunthorpe authored 
      This is more readable, and future patches will need a 3rd lookup type.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      9867f5c6
    • Jason Gunthorpe's avatar
      IB/uverbs: Consolidate uobject destruction · 87ad80ab
      Jason Gunthorpe authored 
      There are several flows that can destroy a uobject and each one is
minimized and sprinkled throughout the code base, making it difficult to
understand and very hard to modify the destroy path.

Consolidate all of these into uverbs_destroy_uobject() and call it in all
cases where a uobject has to be destroyed.

This makes one change to the lifecycle, during any abort (eg when
alloc_commit is not called) we always call out to alloc_abort, even if
remove_commit needs to be called to delete a HW object.

This also renames RDMA_REMOVE_DURING_CLEANUP to RDMA_REMOVE_ABORT to
clarify its actual usage and revises some of the comments to reflect what
the life cycle is for the type implementation.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      87ad80ab
    • Jason Gunthorpe's avatar
      IB/uverbs: Make the write path destroy methods use the same flow as ioctl · 32ed5c00
      Jason Gunthorpe authored 
      The ridiculous dance with uobj_remove_commit() is not needed, the write
path can follow the same flow as ioctl - lock and destroy the HW object
then use the data left over in the uobject to form the response to
userspace.

Two helpers are introduced to make this flow straightforward for the
caller.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      32ed5c00
    • Jason Gunthorpe's avatar
      IB/uverbs: Remove rdma_explicit_destroy() from the ioctl methods · aa72c9a5
      Jason Gunthorpe authored 
      The core code will destroy the HW object on behalf of the method, if the
method provides an implementation it must simply copy data from the stub
uobj into the response. Destroy methods cannot touch the HW object.
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      aa72c9a5
  3. 31 Jul, 2018 29 commits
  5. 27 Jul, 2018 2 commits
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