f7c6a7b5d5
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>
55 lines
1.6 KiB
Plaintext
55 lines
1.6 KiB
Plaintext
menu "InfiniBand support"
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config INFINIBAND
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depends on PCI || BROKEN
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tristate "InfiniBand support"
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---help---
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Core support for InfiniBand (IB). Make sure to also select
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any protocols you wish to use as well as drivers for your
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InfiniBand hardware.
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config INFINIBAND_USER_MAD
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tristate "InfiniBand userspace MAD support"
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depends on INFINIBAND
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---help---
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Userspace InfiniBand Management Datagram (MAD) support. This
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is the kernel side of the userspace MAD support, which allows
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userspace processes to send and receive MADs. You will also
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need libibumad from <http://www.openib.org>.
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config INFINIBAND_USER_ACCESS
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tristate "InfiniBand userspace access (verbs and CM)"
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depends on INFINIBAND
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---help---
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Userspace InfiniBand access support. This enables the
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kernel side of userspace verbs and the userspace
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communication manager (CM). This allows userspace processes
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to set up connections and directly access InfiniBand
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hardware for fast-path operations. You will also need
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libibverbs, libibcm and a hardware driver library from
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<http://www.openib.org>.
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config INFINIBAND_USER_MEM
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bool
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depends on INFINIBAND_USER_ACCESS != n
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default y
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config INFINIBAND_ADDR_TRANS
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bool
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depends on INFINIBAND && INET
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default y
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source "drivers/infiniband/hw/mthca/Kconfig"
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source "drivers/infiniband/hw/ipath/Kconfig"
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source "drivers/infiniband/hw/ehca/Kconfig"
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source "drivers/infiniband/hw/amso1100/Kconfig"
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source "drivers/infiniband/hw/cxgb3/Kconfig"
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source "drivers/infiniband/ulp/ipoib/Kconfig"
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source "drivers/infiniband/ulp/srp/Kconfig"
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source "drivers/infiniband/ulp/iser/Kconfig"
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endmenu
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