Add new API function and new provider method for registering dma-buf based memory region. Update the man page and bump the API version.

Signed-off-by: Jianxin Xiong jianxin.xiong@intel.com --- debian/libibverbs1.symbols | 2 ++ libibverbs/CMakeLists.txt | 2 +- libibverbs/cmd_mr.c | 38 ++++++++++++++++++++++++++++++++++++++ libibverbs/driver.h | 7 +++++++ libibverbs/dummy_ops.c | 11 +++++++++++ libibverbs/libibverbs.map.in | 6 ++++++ libibverbs/man/ibv_reg_mr.3 | 21 +++++++++++++++++++-- libibverbs/verbs.c | 17 +++++++++++++++++ libibverbs/verbs.h | 11 +++++++++++ 9 files changed, 112 insertions(+), 3 deletions(-)

diff --git a/debian/libibverbs1.symbols b/debian/libibverbs1.symbols index 9130f41..fcf4d87 100644 --- a/debian/libibverbs1.symbols +++ b/debian/libibverbs1.symbols @@ -9,6 +9,7 @@ libibverbs.so.1 libibverbs1 #MINVER# IBVERBS_1.9@IBVERBS_1.9 30 IBVERBS_1.10@IBVERBS_1.10 31 IBVERBS_1.11@IBVERBS_1.11 32 + IBVERBS_1.12@IBVERBS_1.12 33 (symver)IBVERBS_PRIVATE_33 33 _ibv_query_gid_ex@IBVERBS_1.11 32 _ibv_query_gid_table@IBVERBS_1.11 32 @@ -99,6 +100,7 @@ libibverbs.so.1 libibverbs1 #MINVER# ibv_rate_to_mbps@IBVERBS_1.1 1.1.8 ibv_rate_to_mult@IBVERBS_1.0 1.1.6 ibv_read_sysfs_file@IBVERBS_1.0 1.1.6 + ibv_reg_dmabuf_mr@IBVERBS_1.12 33 ibv_reg_mr@IBVERBS_1.0 1.1.6 ibv_reg_mr@IBVERBS_1.1 1.1.6 ibv_reg_mr_iova@IBVERBS_1.7 25 diff --git a/libibverbs/CMakeLists.txt b/libibverbs/CMakeLists.txt index 0fe4256..d075225 100644 --- a/libibverbs/CMakeLists.txt +++ b/libibverbs/CMakeLists.txt @@ -21,7 +21,7 @@ configure_file("libibverbs.map.in"

rdma_library(ibverbs "${CMAKE_CURRENT_BINARY_DIR}/libibverbs.map" # See Documentation/versioning.md - 1 1.11.${PACKAGE_VERSION} + 1 1.12.${PACKAGE_VERSION} all_providers.c cmd.c cmd_ah.c diff --git a/libibverbs/cmd_mr.c b/libibverbs/cmd_mr.c index 42dbe42..95ed2d1 100644 --- a/libibverbs/cmd_mr.c +++ b/libibverbs/cmd_mr.c @@ -1,5 +1,6 @@ /* * Copyright (c) 2018 Mellanox Technologies, Ltd. All rights reserved. + * Copyright (c) 2020 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -116,3 +117,40 @@ int ibv_cmd_query_mr(struct ibv_pd *pd, struct verbs_mr *vmr, return 0; }

+int ibv_cmd_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length, + uint64_t iova, int fd, int access, + struct verbs_mr *vmr) +{ + DECLARE_COMMAND_BUFFER(cmdb, UVERBS_OBJECT_MR, + UVERBS_METHOD_REG_DMABUF_MR, + 9); + struct ib_uverbs_attr *handle; + uint32_t lkey, rkey; + int ret; + + handle = fill_attr_out_obj(cmdb, UVERBS_ATTR_REG_DMABUF_MR_HANDLE); + fill_attr_out_ptr(cmdb, UVERBS_ATTR_REG_DMABUF_MR_RESP_LKEY, &lkey); + fill_attr_out_ptr(cmdb, UVERBS_ATTR_REG_DMABUF_MR_RESP_RKEY, &rkey); + + fill_attr_in_obj(cmdb, UVERBS_ATTR_REG_DMABUF_MR_PD_HANDLE, pd->handle); + fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_OFFSET, offset); + fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_LENGTH, length); + fill_attr_in_uint64(cmdb, UVERBS_ATTR_REG_DMABUF_MR_IOVA, iova); + fill_attr_in_uint32(cmdb, UVERBS_ATTR_REG_DMABUF_MR_FD, fd); + fill_attr_in_uint32(cmdb, UVERBS_ATTR_REG_DMABUF_MR_ACCESS_FLAGS, access); + + ret = execute_ioctl(pd->context, cmdb); + if (ret) + return errno; + + vmr->ibv_mr.handle = read_attr_obj(UVERBS_ATTR_REG_DMABUF_MR_HANDLE, + handle); + vmr->ibv_mr.context = pd->context; + vmr->ibv_mr.lkey = lkey; + vmr->ibv_mr.rkey = rkey; + vmr->ibv_mr.pd = pd; + vmr->ibv_mr.addr = (void *)offset; + vmr->ibv_mr.length = length; + vmr->mr_type = IBV_MR_TYPE_MR; + return 0; +} diff --git a/libibverbs/driver.h b/libibverbs/driver.h index ab80f4b..d6a9d0a 100644 --- a/libibverbs/driver.h +++ b/libibverbs/driver.h @@ -2,6 +2,7 @@ * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. * Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved. * Copyright (c) 2005 PathScale, Inc. All rights reserved. + * Copyright (c) 2020 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -373,6 +374,9 @@ struct verbs_context_ops { struct ibv_mr *(*reg_dm_mr)(struct ibv_pd *pd, struct ibv_dm *dm, uint64_t dm_offset, size_t length, unsigned int access); + struct ibv_mr *(*reg_dmabuf_mr)(struct ibv_pd *pd, uint64_t offset, + size_t length, uint64_t iova, + int fd, int access); struct ibv_mr *(*reg_mr)(struct ibv_pd *pd, void *addr, size_t length, uint64_t hca_va, int access); int (*req_notify_cq)(struct ibv_cq *cq, int solicited_only); @@ -498,6 +502,9 @@ int ibv_cmd_advise_mr(struct ibv_pd *pd, uint32_t flags, struct ibv_sge *sg_list, uint32_t num_sge); +int ibv_cmd_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length, + uint64_t iova, int fd, int access, + struct verbs_mr *vmr); int ibv_cmd_alloc_mw(struct ibv_pd *pd, enum ibv_mw_type type, struct ibv_mw *mw, struct ibv_alloc_mw *cmd, size_t cmd_size, diff --git a/libibverbs/dummy_ops.c b/libibverbs/dummy_ops.c index e5af9e4..64ef279 100644 --- a/libibverbs/dummy_ops.c +++ b/libibverbs/dummy_ops.c @@ -1,5 +1,6 @@ /* * Copyright (c) 2017 Mellanox Technologies, Inc. All rights reserved. + * Copyright (c) 2020 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -452,6 +453,14 @@ static struct ibv_mr *reg_mr(struct ibv_pd *pd, void *addr, size_t length, return NULL; }

+static struct ibv_mr *reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, + size_t length, uint64_t iova, + int fd, int access) +{ + errno = EOPNOTSUPP; + return NULL; +} + static int req_notify_cq(struct ibv_cq *cq, int solicited_only) { return EOPNOTSUPP; @@ -560,6 +569,7 @@ const struct verbs_context_ops verbs_dummy_ops = { query_srq, read_counters, reg_dm_mr, + reg_dmabuf_mr, reg_mr, req_notify_cq, rereg_mr, @@ -689,6 +699,7 @@ void verbs_set_ops(struct verbs_context *vctx, SET_PRIV_OP_IC(vctx, set_ece); SET_PRIV_OP_IC(vctx, unimport_mr); SET_PRIV_OP_IC(vctx, unimport_pd); + SET_OP(ctx, reg_dmabuf_mr);

#undef SET_OP #undef SET_OP2 diff --git a/libibverbs/libibverbs.map.in b/libibverbs/libibverbs.map.in index b5ccaca..f67e1ef 100644 --- a/libibverbs/libibverbs.map.in +++ b/libibverbs/libibverbs.map.in @@ -148,6 +148,11 @@ IBVERBS_1.11 { _ibv_query_gid_table; } IBVERBS_1.10;

+IBVERBS_1.12 { + global: + ibv_reg_dmabuf_mr; +} IBVERBS_1.11; + /* If any symbols in this stanza change ABI then the entire staza gets a new symbol version. See the top level CMakeLists.txt for this setting. */

@@ -211,6 +216,7 @@ IBVERBS_PRIVATE_@IBVERBS_PABI_VERSION@ { ibv_cmd_query_srq; ibv_cmd_read_counters; ibv_cmd_reg_dm_mr; + ibv_cmd_reg_dmabuf_mr; ibv_cmd_reg_mr; ibv_cmd_req_notify_cq; ibv_cmd_rereg_mr; diff --git a/libibverbs/man/ibv_reg_mr.3 b/libibverbs/man/ibv_reg_mr.3 index 2bfc955..4975c79 100644 --- a/libibverbs/man/ibv_reg_mr.3 +++ b/libibverbs/man/ibv_reg_mr.3 @@ -3,7 +3,7 @@ ." .TH IBV_REG_MR 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual" .SH "NAME" -ibv_reg_mr, ibv_reg_mr_iova, ibv_dereg_mr - register or deregister a memory region (MR) +ibv_reg_mr, ibv_reg_mr_iova, ibv_reg_dmabuf_mr, ibv_dereg_mr - register or deregister a memory region (MR) .SH "SYNOPSIS" .nf .B #include <infiniband/verbs.h> @@ -15,6 +15,9 @@ ibv_reg_mr, ibv_reg_mr_iova, ibv_dereg_mr - register or deregister a memory reg .BI " size_t " "length" ", uint64_t " "hca_va" , .BI " int " "access" ); .sp +.BI "struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd " "*pd" ", uint64_t " "offset" , +.BI " size_t " "length" ", int " "access" ); +.sp .BI "int ibv_dereg_mr(struct ibv_mr " "*mr" ); .fi .SH "DESCRIPTION" @@ -71,11 +74,25 @@ a lkey or rkey. The offset in the memory region is computed as 'addr + (iova - hca_va)'. Specifying 0 for hca_va has the same effect as IBV_ACCESS_ZERO_BASED. .PP +.B ibv_reg_dmabuf_mr() +registers a dma-buf based memory region (MR) associated with the protection domain +.I pd\fR. +The MR starts at +.I offset +of the dma-buf and its size is +.I length\fR. +The dma-buf is identified by the file descriptor +.I fd\fR. +The argument +.I access +describes the desired memory protection attributes; it is similar to the ibv_reg_mr case except that only the following flags are supported: +.B IBV_ACCESS_LOCAL_WRITE, IBV_ACCESS_REMOTE_WRITE, IBV_ACCESS_REMOTE_READ, IBV_ACCESS_REMOTE_ATOMIC, IBV_ACCESS_RELAXED_ORDERING. +.PP .B ibv_dereg_mr() deregisters the MR .I mr\fR. .SH "RETURN VALUE" -.B ibv_reg_mr() / ibv_reg_mr_iova() +.B ibv_reg_mr() / ibv_reg_mr_iova() / ibv_reg_dmabuf_mr() returns a pointer to the registered MR, or NULL if the request fails. The local key (\fBL_Key\fR) field .B lkey diff --git a/libibverbs/verbs.c b/libibverbs/verbs.c index 2b0ede8..b944904 100644 --- a/libibverbs/verbs.c +++ b/libibverbs/verbs.c @@ -1,6 +1,7 @@ /* * Copyright (c) 2005 Topspin Communications. All rights reserved. * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2020 Intel Corperation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -367,6 +368,22 @@ void ibv_unimport_mr(struct ibv_mr *mr) get_ops(mr->context)->unimport_mr(mr); }

+struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, + size_t length, int fd, int access) +{ + struct ibv_mr *mr; + + mr = get_ops(pd->context)->reg_dmabuf_mr(pd, offset, length, offset, + fd, access); + if (mr) { + mr->context = pd->context; + mr->pd = pd; + mr->addr = (void *)offset; + mr->length = length; + } + return mr; +} + LATEST_SYMVER_FUNC(ibv_rereg_mr, 1_1, "IBVERBS_1.1", int, struct ibv_mr *mr, int flags, diff --git a/libibverbs/verbs.h b/libibverbs/verbs.h index ee57e05..9194ad2 100644 --- a/libibverbs/verbs.h +++ b/libibverbs/verbs.h @@ -3,6 +3,7 @@ * Copyright (c) 2004, 2011-2012 Intel Corporation. All rights reserved. * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved. * Copyright (c) 2005 PathScale, Inc. All rights reserved. + * Copyright (c) 2020 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU @@ -1961,6 +1962,10 @@ struct ibv_context_ops { void *(*_compat_attach_mcast)(void); void *(*_compat_detach_mcast)(void); void *(*_compat_async_event)(void); + struct ibv_mr * (*reg_dmabuf_mr)(struct ibv_pd *pd, + uint64_t offset, size_t length, + uint64_t iova, int fd, + int access); };

struct ibv_context { @@ -2535,6 +2540,12 @@ __ibv_reg_mr_iova(struct ibv_pd *pd, void *addr, size_t length, uint64_t iova, __builtin_constant_p( \ ((access) & IBV_ACCESS_OPTIONAL_RANGE) == 0))

+/** + * ibv_reg_dmabuf_mr - Register a dambuf-based memory region + */ +struct ibv_mr *ibv_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset, size_t length, + int fd, int access); + enum ibv_rereg_mr_err_code { /* Old MR is valid, invalid input */ IBV_REREG_MR_ERR_INPUT = -1,

Define a new sub-class of 'MR' that uses dma-buf object for the memory region. Define a new class 'DmaBuf' for dma-buf object allocation.

Signed-off-by: Jianxin Xiong jianxin.xiong@intel.com --- pyverbs/CMakeLists.txt | 2 ++ pyverbs/dmabuf.pxd | 13 ++++++++ pyverbs/dmabuf.pyx | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++ pyverbs/libibverbs.pxd | 2 ++ pyverbs/mr.pxd | 5 +++ pyverbs/mr.pyx | 77 +++++++++++++++++++++++++++++++++++++++++++-- 6 files changed, 182 insertions(+), 2 deletions(-) create mode 100644 pyverbs/dmabuf.pxd create mode 100644 pyverbs/dmabuf.pyx

diff --git a/pyverbs/CMakeLists.txt b/pyverbs/CMakeLists.txt index 9542c4b..5aee02b 100644 --- a/pyverbs/CMakeLists.txt +++ b/pyverbs/CMakeLists.txt @@ -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.

rdma_cython_module(pyverbs "" addr.pyx @@ -16,6 +17,7 @@ rdma_cython_module(pyverbs "" wr.pyx xrcd.pyx srq.pyx + dmabuf.pyx )

rdma_python_module(pyverbs diff --git a/pyverbs/dmabuf.pxd b/pyverbs/dmabuf.pxd new file mode 100644 index 0000000..040db4b --- /dev/null +++ b/pyverbs/dmabuf.pxd @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB) +# Copyright (c) 2020, Intel Corporation. All rights reserved. + +#cython: language_level=3 + +cdef class DmaBuf: + cdef int dri_fd + cdef int handle + cdef int fd + cdef unsigned long size + cdef unsigned long map_offset + cdef object dmabuf_mrs + cdef add_ref(self, obj) diff --git a/pyverbs/dmabuf.pyx b/pyverbs/dmabuf.pyx new file mode 100644 index 0000000..a72d808 --- /dev/null +++ b/pyverbs/dmabuf.pyx @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB) +# Copyright (c) 2020, Intel Corporation. All rights reserved. + +#cython: language_level=3 + +import weakref + +from os import open, close, O_RDWR +from fcntl import ioctl +from struct import pack_into, unpack +from pyverbs.base cimport close_weakrefs +from pyverbs.mr cimport DmaBufMR + +cdef extern from "drm/drm.h": + cdef int DRM_IOCTL_MODE_CREATE_DUMB + cdef int DRM_IOCTL_MODE_MAP_DUMB + cdef int DRM_IOCTL_MODE_DESTROY_DUMB + cdef int DRM_IOCTL_PRIME_HANDLE_TO_FD + +cdef class DmaBuf: + def __init__(self, size, unit=0): + """ + Allocate DmaBuf object from a GPU device. This is done through the + DRI device interface (/dev/dri/card*). Usually this requires the + effective user id being root or being a member of the 'video' 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. + :return: The newly created DmaBuf object on success. + """ + self.dmabuf_mrs = weakref.WeakSet() + self.dri_fd = open('/dev/dri/card'+str(unit), O_RDWR) + + # create a dumb scanout buffer: + # struct drm_mode_create_dumb { + # __u32 height; + # __u32 width; + # __u32 bpp; + # __u32 flags; + # __u32 handle; /* output */ + # __u32 pitch; /* output */ + # __u64 size; /* output */ + # }; + create_dumb = bytearray(32) + pack_into('=iiiiiiq', create_dumb, 0, 1, size, 8, 0, 0, 0, 0) + ioctl(self.dri_fd, DRM_IOCTL_MODE_CREATE_DUMB, create_dumb) + a, b, c, d, self.handle, e, self.size = unpack('=iiiiiiq', create_dumb) + + # get dma-buf file descriptor from a PRIME handle: + # struct drm_prime_handle { + # __u32 handle; + # __u32 flags; + # __s32 fd; /* output */ + # }; + prime_handle = bytearray(12) + pack_into('=iii', prime_handle, 0, self.handle, O_RDWR, 0) + ioctl(self.dri_fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, prime_handle) + a, b, self.fd = unpack('=iii', prime_handle) + + # set up for mmap of a dumb scanout buffer: + # struct drm_mode_map_dumb { + # __u32 handle; + # __u32 pad; + # __u64 offset; /* output */ + # }; + map_dumb = bytearray(16) + pack_into('=iiq', map_dumb, 0, self.handle, 0, 0) + ioctl(self.dri_fd, DRM_IOCTL_MODE_MAP_DUMB, map_dumb); + a, b, self.map_offset = unpack('=iiq', map_dumb); + + def __dealloc__(self): + close_weakrefs([self.dmabuf_mrs]) + + # destroy a dumb scanout buffer: + # struct drm_mode_destroy_dumb { + # __u32 handle; + # }; + destroy_dumb = bytearray(4) + pack_into('=i', destroy_dumb, 0, self.handle) + ioctl(self.dri_fd, DRM_IOCTL_MODE_DESTROY_DUMB, destroy_dumb) + close(self.dri_fd) + + cdef add_ref(self, obj): + if isinstance(obj, DmaBufMR): + self.dmabuf_mrs.add(obj) + diff --git a/pyverbs/libibverbs.pxd b/pyverbs/libibverbs.pxd index 6fbba54..95e51e1 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, + int fd, int access) int ibv_dereg_mr(ibv_mr *mr) int ibv_advise_mr(ibv_pd *pd, uint32_t advice, uint32_t flags, ibv_sge *sg_list, uint32_t num_sge) diff --git a/pyverbs/mr.pxd b/pyverbs/mr.pxd index ebe8ada..b89cf02 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.

#cython: language_level=3

@@ -33,3 +34,7 @@ cdef class MW(PyverbsCM):

cdef class DMMR(MR): cdef object dm + +cdef class DmaBufMR(MR): + cdef object dmabuf + cdef unsigned long offset diff --git a/pyverbs/mr.pyx b/pyverbs/mr.pyx index 7011da1..4102d3c 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.

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 @@ -14,9 +15,10 @@ 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 @@ -348,6 +350,77 @@ 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=0, access=0, DmaBuf dmabuf=None, offset=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 + :param offset: Byte offset from the beginning of the dma-buf + :return: The newly create DMABUFMR + """ + self.logger = logging.getLogger(self.__class__.__name__) + if dmabuf is None: + dmabuf = DmaBuf(length + offset) + self.mr = v.ibv_reg_dmabuf_mr(pd.pd, offset, length, dmabuf.fd, access) + if self.mr == NULL: + raise PyverbsRDMAErrno('Failed to register a dma-buf MR. length: {len}, access flags: {flags}'. + format(len=length, 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('Registered dma-buf ibv_mr. Length: {len}, access flags {flags}'. + format(len=length, flags=access)) + + 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() + # can't access the attributes if self.dmabuf is used w/o cast + dmabuf = <DmaBuf>self.dmabuf + cdef int off = offset + self.offset + cdef void *buf = mmap(NULL, length + off, PROT_READ | PROT_WRITE, + MAP_SHARED, dmabuf.dri_fd, dmabuf.map_offset) + if buf == MAP_FAILED: + raise PyverbsError('Failed to map dma-buf of size {l}'. + format(l=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 + """ + # can't access the attributes if self.dmabuf is used w/o cast + dmabuf = <DmaBuf>self.dmabuf + cdef int off = offset + self.offset + cdef void *buf = mmap(NULL, length + off, PROT_READ | PROT_WRITE, + MAP_SHARED, dmabuf.dri_fd, dmabuf.map_offset) + if buf == MAP_FAILED: + raise PyverbsError('Failed to map dma-buf of size {l}'. + format(l=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'}