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netmap_slot.c
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265 lines (228 loc) · 9.55 KB
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/*
* Copyright (C) 2013-2015 Vincenzo Maffione. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "netmap_classes.h"
#include <structmember.h>
static void
NetmapSlot_dealloc(NetmapSlot* self)
{
if (self->_view.buf) {
/* XXX Should I free this? I hope self->memoryview
doesn't do it again in its destructor. */
free(self->_view.shape);
}
Py_XDECREF(self->memoryview);
self->ob_type->tp_free((PyObject*)self);
}
static PyObject *
NetmapSlot_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
NetmapSlot *self;
self = (NetmapSlot *)type->tp_alloc(type, 0);
if (self != NULL) {
self->_slot = NULL;
self->memoryview = NULL;
memset(&self->_view, 0, sizeof(Py_buffer));
}
return (PyObject *)self;
}
/* Static data for flags pretty printing. */
static unsigned int ns_flag_values[] = {NS_BUF_CHANGED, NS_REPORT,
NS_FORWARD, NS_NO_LEARN,
NS_INDIRECT, NS_MOREFRAG};
static const char *ns_flag_strings[] = {"NsBufChanged", "NsReport",
"NsForward", "NsNoLearn",
"NsIndirect", "NsMorefrag"};
static PyObject *
NetmapSlot_repr(NetmapSlot *self)
{
PyObject *result;
struct netmap_slot *slot = self->_slot;
char flags[256];
if (slot == NULL) {
return Py_BuildValue("s", "Invalid NetmapSlot");
}
netmap_flags_pretty(slot->flags, flags, sizeof(flags), ns_flag_values,
ns_flag_strings,
sizeof(ns_flag_values)/sizeof(*ns_flag_values));
result = PyString_FromFormat(
"buf_idx: %u\n"
"len: %u\n"
"flags: [0x%04x] %s\n"
"ptr: 0x%016x\n",
slot->buf_idx,
slot->len,
slot->flags,
flags,
slot->ptr
);
return result;
}
static PyMemberDef NetmapSlot_members[] = {
{NULL}
};
int
NetmapSlot_build(NetmapSlot *self, void *addr, void *buf)
{
/* Init the pointer. */
self->_slot = (struct netmap_slot *)addr;
/* Populate a Py_buffer struct, which represents a C memory
buffer. */
memset(&self->_view, 0, sizeof(Py_buffer));
self->_view.buf = buf;
self->_view.len = self->_slot->len;
self->_view.format = "B";
self->_view.ndim = 1;
self->_view.shape = malloc(1 * sizeof (Py_ssize_t));
self->_view.shape[0] = self->_slot->len;
self->_view.itemsize = 1;
/* Expose the C buffer through a 'memoryview' Python object,
so that Python code can directly access the C buffer. */
self->memoryview = PyMemoryView_FromBuffer(&self->_view);
if (!self->memoryview) {
return -1;
}
return 0;
}
void
NetmapSlot_destroy(NetmapSlot *self)
{
self->_slot = NULL;
if (self->_view.buf) {
free(self->_view.shape);
memset(&self->_view, 0, sizeof(Py_buffer));
}
/* TODO should destroy self->memoryview */
}
/*########################## set/get methods #######################*/
static PyObject *
NetmapSlot_memoryview_get(NetmapSlot *self, void *closure)
{
if (self->memoryview == NULL) {
Py_RETURN_NONE;
}
Py_INCREF(self->memoryview);
return self->memoryview;
}
static int
NetmapSlot_memoryview_set(NetmapSlot *self, PyObject *value, void *closure)
{
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "Cannot delete the attribute");
} else {
PyErr_SetString(PyExc_TypeError, "Cannot modify the attribute");
}
return -1;
}
#define DEFINE_NETMAP_SLOT_GETSET(field, type, format) \
static PyObject * \
NetmapSlot_##field##_get(NetmapSlot *self, void *closure) \
{ \
if (!self->_slot) { \
Py_RETURN_NONE; \
} \
return Py_BuildValue(format, self->_slot->field); \
} \
\
static int \
NetmapSlot_##field##_set(NetmapSlot *self, PyObject *value, void *closure) \
{ \
long x; \
if (!self->_slot) { \
PyErr_SetString(PyExc_TypeError, "Attribute not available"); \
return -1; \
} \
x = PyInt_AsLong(value); \
if (x == -1 && PyErr_Occurred()) { \
return -1; \
} \
/* Override the 'const' specifier. */ \
*((type *)&self->_slot->field) = (type)x; \
return 0; \
}
DEFINE_NETMAP_SLOT_GETSET(buf_idx, uint32_t, "I");
DEFINE_NETMAP_SLOT_GETSET(len, uint16_t, "I");
DEFINE_NETMAP_SLOT_GETSET(flags, uint16_t, "I");
DEFINE_NETMAP_SLOT_GETSET(ptr, uint64_t, "k");
#define DECLARE_NETMAP_SLOT_GETSETERS(field) \
{#field, \
(getter)NetmapSlot_##field##_get, (setter)NetmapSlot_##field##_set, \
"netmap ring " #field " field", \
NULL}
static PyGetSetDef NetmapSlot_getseters[] = {
DECLARE_NETMAP_SLOT_GETSETERS(buf_idx),
DECLARE_NETMAP_SLOT_GETSETERS(len),
DECLARE_NETMAP_SLOT_GETSETERS(flags),
DECLARE_NETMAP_SLOT_GETSETERS(ptr),
{"buf",
(getter)NetmapSlot_memoryview_get, (setter)NetmapSlot_memoryview_set,
"netmap buffer memoryview",
NULL},
{NULL} /* Sentinel */
};
static PyMethodDef NetmapSlot_methods[] = {
{NULL}
};
/* Definition exported to netmap.c. */
PyTypeObject NetmapSlotType = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"netmap.NetmapSlot", /*tp_name*/
sizeof(NetmapSlot), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)NetmapSlot_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
(reprfunc)NetmapSlot_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT, /*tp_flags*/
"Netmap interface object", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
NetmapSlot_methods, /* tp_methods */
NetmapSlot_members, /* tp_members */
NetmapSlot_getseters, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
NetmapSlot_new, /* tp_new */
};