[PATCH rdma-core v7 4/6] pyverbs: Add dma-buf based MR support
Gal Pressman
galpress at amazon.com
Sun Jan 31 15:31:16 UTC 2021
On 25/01/2021 21:57, Jianxin Xiong wrote:
> Define a new sub-class of 'MR' that uses dma-buf object for the memory
> region. Define a new class 'DmaBuf' as a wrapper for dma-buf allocation
> mechanism implemented in C.
>
> Update the cmake function for cython modules to allow building modules
> with mixed cython and c source files.
>
> Signed-off-by: Jianxin Xiong <jianxin.xiong at intel.com>
> ---
> buildlib/pyverbs_functions.cmake | 78 +++++++----
> pyverbs/CMakeLists.txt | 11 +-
> pyverbs/dmabuf.pxd | 15 +++
> pyverbs/dmabuf.pyx | 73 ++++++++++
> pyverbs/dmabuf_alloc.c | 278 +++++++++++++++++++++++++++++++++++++++
> pyverbs/dmabuf_alloc.h | 19 +++
> pyverbs/libibverbs.pxd | 2 +
> pyverbs/mr.pxd | 6 +
> pyverbs/mr.pyx | 105 ++++++++++++++-
> 9 files changed, 557 insertions(+), 30 deletions(-)
> create mode 100644 pyverbs/dmabuf.pxd
> create mode 100644 pyverbs/dmabuf.pyx
> create mode 100644 pyverbs/dmabuf_alloc.c
> create mode 100644 pyverbs/dmabuf_alloc.h
>
> diff --git a/buildlib/pyverbs_functions.cmake b/buildlib/pyverbs_functions.cmake
> index 953cec2..0792410 100644
> --- a/buildlib/pyverbs_functions.cmake
> +++ b/buildlib/pyverbs_functions.cmake
> @@ -1,35 +1,61 @@
> # SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB)
> # Copyright (c) 2018, Mellanox Technologies. All rights reserved. See COPYING file
> +# Copyright (c) 2020, Intel Corporation. All rights reserved. See COPYING file
> +
> +function(build_module_from_cfiles PY_MODULE MODULE_NAME ALL_CFILES LINKER_FLAGS)
> + string(REGEX REPLACE "\\.so$" "" SONAME "${MODULE_NAME}${CMAKE_PYTHON_SO_SUFFIX}")
> + add_library(${SONAME} SHARED ${ALL_CFILES})
> + set_target_properties(${SONAME} PROPERTIES
> + COMPILE_FLAGS "${CMAKE_C_FLAGS} -fPIC -fno-strict-aliasing -Wno-unused-function -Wno-redundant-decls -Wno-shadow -Wno-cast-function-type -Wno-implicit-fallthrough -Wno-unknown-warning -Wno-unknown-warning-option -Wno-deprecated-declarations ${NO_VAR_TRACKING_FLAGS}"
> + LIBRARY_OUTPUT_DIRECTORY "${BUILD_PYTHON}/${PY_MODULE}"
> + PREFIX "")
> + target_link_libraries(${SONAME} LINK_PRIVATE ${PYTHON_LIBRARIES} ibverbs rdmacm ${LINKER_FLAGS})
> + install(TARGETS ${SONAME}
> + DESTINATION ${CMAKE_INSTALL_PYTHON_ARCH_LIB}/${PY_MODULE})
> +endfunction()
>
> function(rdma_cython_module PY_MODULE LINKER_FLAGS)
> - foreach(PYX_FILE ${ARGN})
> - get_filename_component(FILENAME ${PYX_FILE} NAME_WE)
> - get_filename_component(DIR ${PYX_FILE} DIRECTORY)
> - if (DIR)
> - set(PYX "${CMAKE_CURRENT_SOURCE_DIR}/${DIR}/${FILENAME}.pyx")
> - else()
> - set(PYX "${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}.pyx")
> - endif()
> - set(CFILE "${CMAKE_CURRENT_BINARY_DIR}/${FILENAME}.c")
> - include_directories(${PYTHON_INCLUDE_DIRS})
> - add_custom_command(
> - OUTPUT "${CFILE}"
> - MAIN_DEPENDENCY "${PYX}"
> - COMMAND ${CYTHON_EXECUTABLE} "${PYX}" -o "${CFILE}"
> - "-I${PYTHON_INCLUDE_DIRS}"
> - COMMENT "Cythonizing ${PYX}"
> + set(ALL_CFILES "")
> + set(MODULE_NAME "")
> + foreach(SRC_FILE ${ARGN})
> + get_filename_component(FILENAME ${SRC_FILE} NAME_WE)
> + get_filename_component(DIR ${SRC_FILE} DIRECTORY)
> + get_filename_component(EXT ${SRC_FILE} EXT)
> + if (DIR)
> + set(SRC_PATH "${CMAKE_CURRENT_SOURCE_DIR}/${DIR}")
> + else()
> + set(SRC_PATH "${CMAKE_CURRENT_SOURCE_DIR}")
> + endif()
> + if (${EXT} STREQUAL ".pyx")
> + # each .pyx file starts a new module, finish the previous module first
> + if (ALL_CFILES AND MODULE_NAME)
> + build_module_from_cfiles(${PY_MODULE} ${MODULE_NAME} "${ALL_CFILES}" "${LINKER_FLAGS}")
> + endif()
> + set(PYX "${SRC_PATH}/${FILENAME}.pyx")
> + set(CFILE "${CMAKE_CURRENT_BINARY_DIR}/${FILENAME}.c")
> + include_directories(${PYTHON_INCLUDE_DIRS})
> + add_custom_command(
> + OUTPUT "${CFILE}"
> + MAIN_DEPENDENCY "${PYX}"
> + COMMAND ${CYTHON_EXECUTABLE} "${PYX}" -o "${CFILE}"
> + "-I${PYTHON_INCLUDE_DIRS}"
> + COMMENT "Cythonizing ${PYX}"
> )
> -
> - string(REGEX REPLACE "\\.so$" "" SONAME "${FILENAME}${CMAKE_PYTHON_SO_SUFFIX}")
> - add_library(${SONAME} SHARED ${CFILE})
> - set_target_properties(${SONAME} PROPERTIES
> - COMPILE_FLAGS "${CMAKE_C_FLAGS} -fPIC -fno-strict-aliasing -Wno-unused-function -Wno-redundant-decls -Wno-shadow -Wno-cast-function-type -Wno-implicit-fallthrough -Wno-unknown-warning -Wno-unknown-warning-option -Wno-deprecated-declarations ${NO_VAR_TRACKING_FLAGS}"
> - LIBRARY_OUTPUT_DIRECTORY "${BUILD_PYTHON}/${PY_MODULE}"
> - PREFIX "")
> - target_link_libraries(${SONAME} LINK_PRIVATE ${PYTHON_LIBRARIES} ibverbs rdmacm ${LINKER_FLAGS})
> - install(TARGETS ${SONAME}
> - DESTINATION ${CMAKE_INSTALL_PYTHON_ARCH_LIB}/${PY_MODULE})
> + set(MODULE_NAME ${FILENAME})
> + set(ALL_CFILES "${CFILE}")
> + elseif(${EXT} STREQUAL ".c")
> + # .c files belong to the same module as the most recent .pyx file,
> + # ignored if appearing before all .pyx files
> + set(CFILE "${SRC_PATH}/${FILENAME}.c")
> + set(ALL_CFILES "${ALL_CFILES};${CFILE}")
> + else()
> + continue()
> + endif()
> endforeach()
> + # finish the last module
> + if (ALL_CFILES AND MODULE_NAME)
> + build_module_from_cfiles(${PY_MODULE} ${MODULE_NAME} "${ALL_CFILES}" "${LINKER_FLAGS}")
> + endif()
> endfunction()
>
> function(rdma_python_module PY_MODULE)
> diff --git a/pyverbs/CMakeLists.txt b/pyverbs/CMakeLists.txt
> index 9542c4b..6fd7625 100644
> --- a/pyverbs/CMakeLists.txt
> +++ b/pyverbs/CMakeLists.txt
> @@ -1,5 +1,10 @@
> # SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB)
> # Copyright (c) 2019, Mellanox Technologies. All rights reserved. See COPYING file
> +# Copyright (c) 2020, Intel Corporation. All rights reserved. See COPYING file
> +
> +publish_internal_headers(""
> + dmabuf_alloc.h
> +)
>
> rdma_cython_module(pyverbs ""
> addr.pyx
> @@ -8,15 +13,17 @@ rdma_cython_module(pyverbs ""
> cmid.pyx
> cq.pyx
> device.pyx
> + dmabuf.pyx
> + dmabuf_alloc.c
> enums.pyx
> mem_alloc.pyx
> mr.pyx
> pd.pyx
> qp.pyx
> + srq.pyx
> wr.pyx
> xrcd.pyx
> - srq.pyx
> - )
> +)
>
> rdma_python_module(pyverbs
> __init__.py
> diff --git a/pyverbs/dmabuf.pxd b/pyverbs/dmabuf.pxd
> new file mode 100644
> index 0000000..a063acb
> --- /dev/null
> +++ b/pyverbs/dmabuf.pxd
> @@ -0,0 +1,15 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB)
> +# Copyright (c) 2020, Intel Corporation. All rights reserved. See COPYING file
> +
> +#cython: language_level=3
> +
> +cdef class DmaBuf:
> + cdef int drm_fd
> + cdef int handle
> + cdef int fd
> + cdef unsigned long size
> + cdef unsigned long map_offset
> + cdef void *dmabuf
> + cdef object dmabuf_mrs
> + cdef add_ref(self, obj)
> + cpdef close(self)
> diff --git a/pyverbs/dmabuf.pyx b/pyverbs/dmabuf.pyx
> new file mode 100644
> index 0000000..b9406bd
> --- /dev/null
> +++ b/pyverbs/dmabuf.pyx
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB)
> +# Copyright (c) 2020, Intel Corporation. All rights reserved. See COPYING file
> +
> +#cython: language_level=3
> +
> +import weakref
> +
> +from pyverbs.base cimport close_weakrefs
> +from pyverbs.base import PyverbsRDMAErrno
> +from pyverbs.mr cimport DmaBufMR
> +
> +cdef extern from "dmabuf_alloc.h":
> + cdef struct dmabuf:
> + pass
> + dmabuf *dmabuf_alloc(unsigned long size, int unit, int gtt)
> + void dmabuf_free(dmabuf *dmabuf)
> + int dmabuf_get_drm_fd(dmabuf *dmabuf)
> + int dmabuf_get_fd(dmabuf *dmabuf)
> + unsigned long dmabuf_get_offset(dmabuf *dmabuf)
> +
> +
> +cdef class DmaBuf:
> + def __init__(self, size, unit=0, gtt=0):
> + """
> + Allocate DmaBuf object from a GPU device. This is done through the
> + DRI device interface. Usually this requires the effective user id
> + being a member of the 'render' group.
> + :param size: The size (in number of bytes) of the buffer.
> + :param unit: The unit number of the GPU to allocate the buffer from.
> + :param gtt: Allocate from GTT instead of VRAM.
> + :return: The newly created DmaBuf object on success.
> + """
> + self.dmabuf_mrs = weakref.WeakSet()
> + self.dmabuf = dmabuf_alloc(size, unit, gtt)
> + if self.dmabuf == NULL:
> + raise PyverbsRDMAErrno(f'Failed to allocate dmabuf of size {size} on unit {unit}')
> + self.drm_fd = dmabuf_get_drm_fd(<dmabuf *>self.dmabuf)
> + self.fd = dmabuf_get_fd(<dmabuf *>self.dmabuf)
> + self.map_offset = dmabuf_get_offset(<dmabuf *>self.dmabuf)
> +
> + def __dealloc__(self):
> + self.close()
> +
> + cpdef close(self):
> + if self.dmabuf == NULL:
> + return None
> + close_weakrefs([self.dmabuf_mrs])
> + dmabuf_free(<dmabuf *>self.dmabuf)
> + self.dmabuf = NULL
> +
> + cdef add_ref(self, obj):
> + if isinstance(obj, DmaBufMR):
> + self.dmabuf_mrs.add(obj)
> +
> + @property
> + def drm_fd(self):
> + return self.drm_fd
> +
> + @property
> + def handle(self):
> + return self.handle
> +
> + @property
> + def fd(self):
> + return self.fd
> +
> + @property
> + def size(self):
> + return self.size
> +
> + @property
> + def map_offset(self):
> + return self.map_offset
> diff --git a/pyverbs/dmabuf_alloc.c b/pyverbs/dmabuf_alloc.c
> new file mode 100644
> index 0000000..05eae75
> --- /dev/null
> +++ b/pyverbs/dmabuf_alloc.c
> @@ -0,0 +1,278 @@
> +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
> +/*
> + * Copyright 2020 Intel Corporation. All rights reserved. See COPYING file
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <unistd.h>
> +#include <string.h>
> +#include <errno.h>
> +#include <drm/drm.h>
> +#include <drm/i915_drm.h>
> +#include <drm/amdgpu_drm.h>
> +#include <drm/radeon_drm.h>
I assume these should come from the kernel headers package, right?
We're getting new compilation errors on SLES 15 for some reason, although the
package is installed.
FAILED: pyverbs/CMakeFiles/dmabuf.cpython-36m-x86_64-linux-gnu.dir/dmabuf_alloc.c.o
/usr/bin/cc -Ddmabuf_cpython_36m_x86_64_linux_gnu_EXPORTS -Iinclude -I/usr/include/libnl3 -I/usr/include/python3.6m -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -O2 -g -fPIC -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Wredundant-decls -fPIC -fno-strict-aliasing -Wno-unused-function -Wno-redundant-decls -Wno-shadow -Wno-cast-function-type -Wno-implicit-fallthrough -Wno-unknown-warning -Wno-unknown-warning-option -Wno-deprecated-declarations -fno-var-tracking-assignments -std=gnu11 -MD -MT pyverbs/CMakeFiles/dmabuf.cpython-36m-x86_64-linux-gnu.dir/dmabuf_alloc.c.o -MF pyverbs/CMakeFiles/dmabuf.cpython-36m-x86_64-linux-gnu.dir/dmabuf_alloc.c.o.d -o pyverbs/CMakeFiles/dmabuf.cpython-36m-x86_64-linux-gnu.dir/dmabuf_alloc.c.o -c ../pyverbs/dmabuf_alloc.c
../pyverbs/dmabuf_alloc.c:12:10: fatal error: drm/drm.h: No such file or directory
#include <drm/drm.h>
^~~~~~~~~~~
compilation terminated.
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