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@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> +#include <fcntl.h> +#include <sys/ioctl.h> +#include "dmabuf_alloc.h" + +/* + * Abstraction of the buffer allocation mechanism using the DRM interface. + * The interface is accessed by ioctl() calls over the '/dev/dri/renderD*' + * device. Successful access usually requires the effective user id being + * in the 'render' group. + */ + +struct drm { + int fd; + int (*alloc)(struct drm *drm, uint64_t size, uint32_t *handle, int gtt); + int (*mmap_offset)(struct drm *drm, uint32_t handle, uint64_t *offset); +}; + +static int i915_alloc(struct drm *drm, uint64_t size, uint32_t *handle, int gtt) +{ + struct drm_i915_gem_create gem_create = {}; + int err; + + gem_create.size = size; + err = ioctl(drm->fd, DRM_IOCTL_I915_GEM_CREATE, &gem_create); + if (err) + return err; + + *handle = gem_create.handle; + return 0; +} + +static int amdgpu_alloc(struct drm *drm, size_t size, uint32_t *handle, int gtt) +{ + union drm_amdgpu_gem_create gem_create = {{}}; + int err; + + gem_create.in.bo_size = size; + if (gtt) { + gem_create.in.domains = AMDGPU_GEM_DOMAIN_GTT; + gem_create.in.domain_flags = AMDGPU_GEM_CREATE_CPU_GTT_USWC; + } else { + gem_create.in.domains = AMDGPU_GEM_DOMAIN_VRAM; + gem_create.in.domain_flags = + AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED; + } + err = ioctl(drm->fd, DRM_IOCTL_AMDGPU_GEM_CREATE, &gem_create); + if (err) + return err; + + *handle = gem_create.out.handle; + return 0; +} + +static int i915_mmap_offset(struct drm *drm, uint32_t handle, uint64_t *offset) +{ + struct drm_i915_gem_mmap_gtt gem_mmap = {}; + int err; + + gem_mmap.handle = handle; + err = ioctl(drm->fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &gem_mmap); + if (err) + return err; + + *offset = gem_mmap.offset; + return 0; +} + +static int amdgpu_mmap_offset(struct drm *drm, uint32_t handle, + uint64_t *offset) +{ + union drm_amdgpu_gem_mmap gem_mmap = {{}}; + int err; + + gem_mmap.in.handle = handle; + err = ioctl(drm->fd, DRM_IOCTL_AMDGPU_GEM_MMAP, &gem_mmap); + if (err) + return err; + + *offset = gem_mmap.out.addr_ptr; + return 0; +} + +static struct drm *drm_open(int unit) +{ + char path[32]; + struct drm_version version = {}; + char name[16] = {}; + int err; + struct drm *drm; + + drm = malloc(sizeof(*drm)); + if (!drm) + return NULL; + + snprintf(path, sizeof(path), "/dev/dri/renderD%d", unit + 128); + + drm->fd = open(path, O_RDWR); + if (drm->fd < 0) + goto out_free; + + version.name = name; + version.name_len = 16; + err = ioctl(drm->fd, DRM_IOCTL_VERSION, &version); + if (err) + goto out_close; + + if (!strcmp(name, "amdgpu")) { + drm->alloc = amdgpu_alloc; + drm->mmap_offset = amdgpu_mmap_offset; + } else if (!strcmp(name, "i915")) { + drm->alloc = i915_alloc; + drm->mmap_offset = i915_mmap_offset; + } else { + errno = EOPNOTSUPP; + goto out_close; + } + return drm; + +out_close: + close(drm->fd); + +out_free: + free(drm); + return NULL; +} + +static void drm_close(struct drm *drm) +{ + if (!drm || drm->fd < 0) + return; + + close(drm->fd); + free(drm); +} + +static void drm_free_buf(struct drm *drm, uint32_t handle) +{ + struct drm_gem_close close = {}; + + close.handle = handle; + ioctl(drm->fd, DRM_IOCTL_GEM_CLOSE, &close); +} + +static int drm_alloc_buf(struct drm *drm, size_t size, uint32_t *handle, + int *fd, int gtt) +{ + struct drm_prime_handle prime_handle = {}; + int err; + + if (!drm || drm->fd < 0) + return -EINVAL; + + err = drm->alloc(drm, size, handle, gtt); + if (err) + return err; + + prime_handle.handle = *handle; + prime_handle.flags = O_RDWR; + err = ioctl(drm->fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &prime_handle); + if (err) { + drm_free_buf(drm, *handle); + return err; + } + + *fd = prime_handle.fd; + return 0; +} + +static int drm_map_buf(struct drm *drm, uint32_t handle, uint64_t *offset) +{ + if (!drm || drm->fd < 0) + return -EINVAL; + + return drm->mmap_offset(drm, handle, offset); +} + +/* + * Abstraction of dmabuf object, allocated using the DRI abstraction defined + * above. + */ + +struct dmabuf { + struct drm *drm; + int fd; + uint32_t handle; + uint64_t map_offset; +}; + +/* + * dmabuf_alloc - allocate a dmabuf from GPU + * @size - byte size of the buffer to allocate + * @unit - the GPU unit to use + * @gtt - if true, allocate from GTT instead of VRAM + */ +struct dmabuf *dmabuf_alloc(uint64_t size, int unit, int gtt) +{ + struct dmabuf *dmabuf; + int err; + + dmabuf = malloc(sizeof(*dmabuf)); + if (!dmabuf) + return NULL; + + dmabuf->drm = drm_open(unit); + if (!dmabuf->drm) + goto out_free; + + err = drm_alloc_buf(dmabuf->drm, size, &dmabuf->handle, &dmabuf->fd, gtt); + if (err) + goto out_close; + + err = drm_map_buf(dmabuf->drm, dmabuf->handle, &dmabuf->map_offset); + if (err) + goto out_free_buf; + + return dmabuf; + +out_free_buf: + drm_free_buf(dmabuf->drm, dmabuf->handle); + +out_close: + drm_close(dmabuf->drm); + +out_free: + free(dmabuf); + return NULL; +} + +void dmabuf_free(struct dmabuf *dmabuf) +{ + if (!dmabuf) + return; + + close(dmabuf->fd); + drm_free_buf(dmabuf->drm, dmabuf->handle); + drm_close(dmabuf->drm); + free(dmabuf); +} + +int dmabuf_get_drm_fd(struct dmabuf *dmabuf) +{ + if (!dmabuf || !dmabuf->drm) + return -1; + + return dmabuf->drm->fd; +} + +int dmabuf_get_fd(struct dmabuf *dmabuf) +{ + if (!dmabuf) + return -1; + + return dmabuf->fd; +} + +uint64_t dmabuf_get_offset(struct dmabuf *dmabuf) +{ + if (!dmabuf) + return -1; + + return dmabuf->map_offset; +} + diff --git a/pyverbs/dmabuf_alloc.h b/pyverbs/dmabuf_alloc.h new file mode 100644 index 0000000..f1b03c5 --- /dev/null +++ b/pyverbs/dmabuf_alloc.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright 2020 Intel Corporation. All rights reserved. See COPYING file + */ + +#ifndef _DMABUF_ALLOC_H_ +#define _DMABUF_ALLOC_H_ + +#include <stdint.h> + +struct dmabuf; + +struct dmabuf *dmabuf_alloc(uint64_t size, int unit, int gtt); +void dmabuf_free(struct dmabuf *dmabuf); +int dmabuf_get_drm_fd(struct dmabuf *dmabuf); +int dmabuf_get_fd(struct dmabuf *dmabuf); +uint64_t dmabuf_get_offset(struct dmabuf *dmabuf); + +#endif /* _DMABUF_ALLOC_H_ */ diff --git a/pyverbs/libibverbs.pxd b/pyverbs/libibverbs.pxd index 5005650..d960d31 100644 --- a/pyverbs/libibverbs.pxd +++ b/pyverbs/libibverbs.pxd @@ -507,6 +507,8 @@ cdef extern from 'infiniband/verbs.h': ibv_pd *ibv_alloc_pd(ibv_context *context) int ibv_dealloc_pd(ibv_pd *pd) ibv_mr *ibv_reg_mr(ibv_pd *pd, void *addr, size_t length, int access) + ibv_mr *ibv_reg_dmabuf_mr(ibv_pd *pd, uint64_t offset, size_t length, + uint64_t iova, int fd, int access) int ibv_rereg_mr(ibv_mr *mr, int flags, ibv_pd *pd, void *addr, size_t length, int access) int ibv_dereg_mr(ibv_mr *mr) diff --git a/pyverbs/mr.pxd b/pyverbs/mr.pxd index ebe8ada..d9a79ff 100644 --- a/pyverbs/mr.pxd +++ b/pyverbs/mr.pxd @@ -1,5 +1,6 @@ # 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
#cython: language_level=3
@@ -33,3 +34,8 @@ cdef class MW(PyverbsCM):
cdef class DMMR(MR): cdef object dm + +cdef class DmaBufMR(MR): + cdef object dmabuf + cdef unsigned long offset + cdef object is_dmabuf_internal diff --git a/pyverbs/mr.pyx b/pyverbs/mr.pyx index b0f106d..aad47e2 100644 --- a/pyverbs/mr.pyx +++ b/pyverbs/mr.pyx @@ -1,11 +1,12 @@ # 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
import resource import logging
from posix.mman cimport mmap, munmap, MAP_PRIVATE, PROT_READ, PROT_WRITE, \ - MAP_ANONYMOUS, MAP_HUGETLB + MAP_ANONYMOUS, MAP_HUGETLB, MAP_SHARED from pyverbs.pyverbs_error import PyverbsError, PyverbsRDMAError, \ PyverbsUserError from libc.stdint cimport uintptr_t, SIZE_MAX @@ -15,9 +16,10 @@ from posix.stdlib cimport posix_memalign from libc.string cimport memcpy, memset cimport pyverbs.libibverbs_enums as e from pyverbs.device cimport DM -from libc.stdlib cimport free +from libc.stdlib cimport free, malloc from .cmid cimport CMID from .pd cimport PD +from .dmabuf cimport DmaBuf
cdef extern from 'sys/mman.h': cdef void* MAP_FAILED @@ -380,6 +382,105 @@ cdef class DMMR(MR): cpdef read(self, length, offset): return self.dm.copy_from_dm(offset, length)
+cdef class DmaBufMR(MR): + def __init__(self, PD pd not None, length, access, DmaBuf dmabuf=None, + offset=0, unit=0, gtt=0): + """ + Initializes a DmaBufMR (DMA-BUF Memory Region) of the given length + and access flags using the given PD and DmaBuf objects. + :param pd: A PD object + :param length: Length in bytes + :param access: Access flags, see ibv_access_flags enum + :param dmabuf: A DmaBuf object. One will be allocated if absent + :param offset: Byte offset from the beginning of the dma-buf + :param unit: GPU unit for internal dmabuf allocation + :param gtt: If true allocate internal dmabuf from GTT instead of VRAM + :return: The newly created DMABUFMR + """ + self.logger = logging.getLogger(self.__class__.__name__) + if dmabuf is None: + self.is_dmabuf_internal = True + dmabuf = DmaBuf(length + offset, unit, gtt) + self.mr = v.ibv_reg_dmabuf_mr(pd.pd, offset, length, offset, dmabuf.fd, access) + if self.mr == NULL: + raise PyverbsRDMAErrno(f'Failed to register a dma-buf MR. length: {length}, access flags: {access}') + super().__init__(pd, length, access) + self.pd = pd + self.dmabuf = dmabuf + self.offset = offset + pd.add_ref(self) + dmabuf.add_ref(self) + self.logger.debug(f'Registered dma-buf ibv_mr. Length: {length}, access flags {access}') + + def __dealloc__(self): + self.close() + + cpdef close(self): + """ + Closes the underlying C object of the MR and frees the memory allocated. + :return: None + """ + if self.mr != NULL: + self.logger.debug('Closing dma-buf MR') + rc = v.ibv_dereg_mr(self.mr) + if rc != 0: + raise PyverbsRDMAError('Failed to dereg dma-buf MR', rc) + self.pd = None + self.mr = NULL + # Set self.mr to NULL before closing dmabuf because this method is + # re-entered when close_weakrefs() is called inside dmabuf.close(). + if self.is_dmabuf_internal: + self.dmabuf.close() + self.dmabuf = None + + @property + def offset(self): + return self.offset + + @property + def dmabuf(self): + return self.dmabuf + + def write(self, data, length, offset=0): + """ + Write user data to the dma-buf backing the MR + :param data: User data to write + :param length: Length of the data to write + :param offset: Writing offset + :return: None + """ + if isinstance(data, str): + data = data.encode() + cdef int off = offset + self.offset + cdef void *buf = mmap(NULL, length + off, PROT_READ | PROT_WRITE, + MAP_SHARED, self.dmabuf.drm_fd, + self.dmabuf.map_offset) + if buf == MAP_FAILED: + raise PyverbsError(f'Failed to map dma-buf of size {length}') + memcpy(<char*>(buf + off), <char *>data, length) + munmap(buf, length + off) + + cpdef read(self, length, offset): + """ + Reads data from the dma-buf backing the MR + :param length: Length of data to read + :param offset: Reading offset + :return: The data on the buffer in the requested offset + """ + cdef int off = offset + self.offset + cdef void *buf = mmap(NULL, length + off, PROT_READ | PROT_WRITE, + MAP_SHARED, self.dmabuf.drm_fd, + self.dmabuf.map_offset) + if buf == MAP_FAILED: + raise PyverbsError(f'Failed to map dma-buf of size {length}') + cdef char *data =<char*>malloc(length) + memset(data, 0, length) + memcpy(data, <char*>(buf + off), length) + munmap(buf, length + off) + res = data[:length] + free(data) + return res +
def mwtype2str(mw_type): mw_types = {1:'IBV_MW_TYPE_1', 2:'IBV_MW_TYPE_2'}