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Roland Dreier f7c6a7b5d5 IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules ... Export ib_umem_get()/ib_umem_release() and put low-level drivers in control of when to call ib_umem_get() to pin and DMA map userspace, rather than always calling it in ib_uverbs_reg_mr() before calling the low-level driver's reg_user_mr method. Also move these functions to be in the ib_core module instead of ib_uverbs, so that driver modules using them do not depend on ib_uverbs. This has a number of advantages: - It is better design from the standpoint of making generic code a library that can be used or overridden by device-specific code as the details of specific devices dictate. - Drivers that do not need to pin userspace memory regions do not need to take the performance hit of calling ib_mem_get(). For example, although I have not tried to implement it in this patch, the ipath driver should be able to avoid pinning memory and just use copy_{to,from}_user() to access userspace memory regions. - Buffers that need special mapping treatment can be identified by the low-level driver. For example, it may be possible to solve some Altix-specific memory ordering issues with mthca CQs in userspace by mapping CQ buffers with extra flags. - Drivers that need to pin and DMA map userspace memory for things other than memory regions can use ib_umem_get() directly, instead of hacks using extra parameters to their reg_phys_mr method. For example, the mlx4 driver that is pending being merged needs to pin and DMA map QP and CQ buffers, but it does not need to create a memory key for these buffers. So the cleanest solution is for mlx4 to call ib_umem_get() in the create_qp and create_cq methods. Signed-off-by: Roland Dreier <rolandd@cisco.com>		18 years ago
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Kconfig	…
Makefile	…
cxio_dbg.c	…
cxio_hal.c	IB: Return "maybe missed event" hint from ib_req_notify_cq()	18 years ago
cxio_hal.h	…
cxio_resource.c	…
cxio_resource.h	…
cxio_wr.h	…
iwch.c	…
iwch.h	…
iwch_cm.c	RDMA/cxgb3: Support for new abort logic	18 years ago
iwch_cm.h	RDMA/cxgb3: Support for new abort logic	18 years ago
iwch_cq.c	…
iwch_ev.c	…
iwch_mem.c	…
iwch_provider.c	IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules	18 years ago
iwch_provider.h	IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules	18 years ago
iwch_qp.c	…
iwch_user.h	…
tcb.h	…