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RDMA/ocrdma: Dont use PD 0 for userpace CQ DB

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Create_CQ verb doesn't provide a PD pointer.  So, until now we are
creating all (both userspace and kernel) CQ DB regions from PD0.  This
will result in mmapping PD0 to applications.  A rogue userspace
application can mess things up.

Also more serious issues is even the be2net NIC uses PD0.

This patch addresses this problem by:

1) Create a PD page for every userspace application when the
   alloc_ucontext is called. This will be destroyed in
   dealloc_ucontext.
2) All CQs for that context will use the PD allocated in ucontext.
3) The first create_PD call from application will result in returning
   the PD address from its ucontext (no new PD will be created).
4) For subsecquent create_pd calls from application, we create new PDs for
   the application.

Signed-off-by: Naresh Gottumukkala <bgottumukkala@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Naresh Gottumukkala
2013-08-26 15:27:44 +05:30
committed by Roland Dreier
parent 2b51a9b9eb
commit cffce99051
6 changed files with 339 additions and 40 deletions
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3
drivers/infiniband/hw/ocrdma/ocrdma.h
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@@ -324,6 +324,9 @@ struct ocrdma_ucontext {
struct list_head mm_head;
struct mutex mm_list_lock; /* protects list entries of mm type */
struct ocrdma_pd *cntxt_pd;
int pd_in_use;
struct {
u32 *va;
dma_addr_t pa;