[PATCH rdma-core 1/4] pyverbs: Add memory allocation class

[Noa Osherovich <noaos@mellanox.com>]

From: Edward Srouji <edwards@mellanox.com>

Add new MemAlloc class which wraps some C memory allocation functions
such as aligned_alloc, malloc and free.
This allows Pyverbs' users to easily allocate and free memory in C
style, i.e when the memory address must be passed to a driver API.

Signed-off-by: Edward Srouji <edwards@mellanox.com>
Reviewd-by: Daria Velikovsky <daria@mellanox.com>
Reviewd-by: Noa Osherovich <noaos@mellanox.com>
---
 pyverbs/base.pxd |  3 +++
 pyverbs/base.pyx | 26 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/pyverbs/base.pxd b/pyverbs/base.pxd
index e85f7c020e1c..e956a79915ff 100644
--- a/pyverbs/base.pxd
+++ b/pyverbs/base.pxd
@@ -9,3 +9,6 @@ cdef class PyverbsObject(object):
 
 cdef class PyverbsCM(PyverbsObject):
     cpdef close(self)
+
+cdef class MemAlloc(object):
+   pass
diff --git a/pyverbs/base.pyx b/pyverbs/base.pyx
index 8b3e6741ae19..a41cfc748ad0 100644
--- a/pyverbs/base.pyx
+++ b/pyverbs/base.pyx
@@ -3,8 +3,14 @@
 
 import logging
 from pyverbs.pyverbs_error import PyverbsRDMAError
+from libc.stdlib cimport malloc, free
+from libc.stdint cimport uintptr_t
 from libc.errno cimport errno
 
+cdef extern from 'stdlib.h':
+    void *aligned_alloc(size_t alignment, size_t size)
+
+
 cpdef PyverbsRDMAErrno(str msg):
     return PyverbsRDMAError(msg, errno)
 
@@ -58,3 +64,23 @@ cdef class PyverbsCM(PyverbsObject):
 
     cpdef close(self):
         pass
+
+
+cdef class MemAlloc(object):
+    @staticmethod
+    def malloc(size):
+        ptr = malloc(size)
+        if not ptr:
+            raise MemoryError('Failed to allocate memory')
+        return <uintptr_t>ptr
+
+    @staticmethod
+    def aligned_alloc(size, alignment=8):
+        ptr = aligned_alloc(alignment, size)
+        if not ptr:
+            raise MemoryError('Failed to allocate memory')
+        return <uintptr_t>ptr
+
+    @staticmethod
+    def free(ptr):
+        free(<void*><uintptr_t>ptr)
-- 
2.21.0