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netmap_desc.c
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305 lines (262 loc) · 10.4 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>
#include <fcntl.h> /* open() */
#include <sys/ioctl.h> /* ioctl() */
#include <sys/mman.h> /* mmap() */
#include <net/if.h> /* IFNAMSIZ */
#include <net/netmap.h>
#include <stdio.h>
#define NETMAP_WITH_LIBS
#include <net/netmap_user.h>
/* Destructor method for NetmapDescType. */
static void
NetmapDesc_dealloc(NetmapDesc* self)
{
NetmapMemory_dealloc(&self->memory);
if (self->nmd) {
nm_close(self->nmd);
self->nmd = NULL;
}
self->ob_type->tp_free((PyObject*)self);
}
/* Netmap.__new__() is the constructor. */
static PyObject *
NetmapDesc_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
NetmapDesc *self;
self = (NetmapDesc *)type->tp_alloc(type, 0);
if (self == NULL) {
return NULL;
}
self->nmd = NULL;
NetmapMemory_new(&self->memory);
return (PyObject *)self;
}
/* Netmap.__init__(), may be called many times, or not called at all. */
static int
NetmapDesc_init(NetmapDesc *self, PyObject *args, PyObject *kwds)
{
PyObject *dev_name = NULL;
static char *kwlist[] = {"ifname", "flags", NULL};
const char *ifname;
unsigned long flags = 0;
int ret;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|k", kwlist,
&ifname, &flags)) {
return -1;
}
/* Open the netmap device and register an interface. */
self->nmd = nm_open(ifname, NULL, flags, NULL);
if (self->nmd == NULL) {
PyErr_SetString(NetmapError, "nm_open() failed");
return -1;
}
/* Setup the netmap memory layout. The +1 are here to take into account
the host rings. */
ret = NetmapMemory_setup(&self->memory, self->nmd->nifp,
self->nmd->req.nr_tx_rings + 1,
self->nmd->req.nr_rx_rings + 1);
return ret;
}
static PyObject *
NetmapDesc_repr(NetmapDesc *self)
{
PyObject *result;
char ringid[128];
char flags[128];
ringid_pretty_print(self->nmd->req.nr_ringid, self->nmd->req.nr_flags,
ringid, sizeof(ringid), flags, sizeof(flags));
result = PyString_FromFormat(
"if_name: '%s'\n"
"ringid: '%s'\n"
"flags: '%s'\n",
self->nmd->req.nr_name, ringid, flags);
return result;
}
static PyMemberDef NetmapDesc_members[] = {
{NULL} /* Sentinel */
};
/*########################## set/get methods #######################*/
#define NETMAP_MANAGER_DEFINE_GETSET(obj) \
static PyObject * \
NetmapDesc_##obj##_get(NetmapDesc *self, void *closure) \
{ \
if (self->memory.obj == NULL) { \
Py_RETURN_NONE; \
} \
Py_INCREF(self->memory.obj); \
return self->memory.obj; \
} \
\
static int \
NetmapDesc_##obj##_set(NetmapDesc *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; \
}
NETMAP_MANAGER_DEFINE_GETSET(interface);
NETMAP_MANAGER_DEFINE_GETSET(transmit_rings);
NETMAP_MANAGER_DEFINE_GETSET(receive_rings);
#define NETMAP_MANAGER_DECLARE_GETSET(obj, desc) \
{#obj, \
(getter)NetmapDesc_##obj##_get, \
(setter)NetmapDesc_##obj##_set, \
desc, \
NULL}
static PyGetSetDef NetmapDesc_getseters[] = {
NETMAP_MANAGER_DECLARE_GETSET(interface, "NetmapInterface object"),
NETMAP_MANAGER_DECLARE_GETSET(transmit_rings,
"List of NetmapRing objects (Tx)"),
NETMAP_MANAGER_DECLARE_GETSET(receive_rings,
"List of NetmapRing objects (Rx)"),
{NULL} /* Sentinel */
};
/*########################## NetmapDesc methods ########################*/
static PyObject *
NetmapDesc_enter(NetmapDesc *self)
{
Py_INCREF(self);
return (PyObject *)self;
}
static PyObject *
NetmapDesc_exit(NetmapDesc *self, PyObject *args)
{
if (self->nmd) {
nm_close(self->nmd);
self->nmd = NULL;
}
Py_RETURN_NONE;
}
static PyObject *
NetmapDesc_xxsync(NetmapDesc *self, int iocmd)
{
int ret;
/* Issue the request to the netmap device. */
ret = ioctl(self->nmd->fd, iocmd, NULL);
if (ret) {
PyErr_SetFromErrno(NetmapError);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *
NetmapDesc_txsync(NetmapDesc *self)
{
return NetmapDesc_xxsync(self, NIOCTXSYNC);
}
static PyObject *
NetmapDesc_rxsync(NetmapDesc *self)
{
return NetmapDesc_xxsync(self, NIOCRXSYNC);
}
static PyObject *
NetmapDesc_getfd(NetmapDesc *self)
{
return Py_BuildValue("i", self->nmd->fd);
}
static PyObject *
NetmapDesc_getringid(NetmapDesc *self)
{
return Py_BuildValue("k", self->nmd->req.nr_ringid);
}
static PyObject *
NetmapDesc_getflags(NetmapDesc *self)
{
return Py_BuildValue("k", self->nmd->req.nr_flags);
}
/* A container for the netmap methods. */
static PyMethodDef NetmapDesc_methods[] = {
{"__enter__", (PyCFunction)NetmapDesc_enter, METH_NOARGS,
"__enter__ implementation to support with statement"
},
{"__exit__", (PyCFunction)NetmapDesc_exit, METH_VARARGS,
"__exit__ implementation to support with statement"
},
{"txsync", (PyCFunction)NetmapDesc_txsync, METH_NOARGS,
"Do a txsync on the registered rings"
},
{"rxsync", (PyCFunction)NetmapDesc_rxsync, METH_NOARGS,
"Do a rxsync on the registered rings"
},
{"getfd", (PyCFunction)NetmapDesc_getfd, METH_NOARGS,
"Get the file descriptor of the open netmap device"
},
{"getringid", (PyCFunction)NetmapDesc_getringid, METH_NOARGS,
"Get the nr_ringid of the registered interface"
},
{"getflags", (PyCFunction)NetmapDesc_getflags, METH_NOARGS,
"Get the nr_flags of the registered interface"
},
{NULL} /* Sentinel */
};
/* Definition exported to netmap.c. */
PyTypeObject NetmapDescType = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"netmap.NetmapDesc", /*tp_name*/
sizeof(NetmapDesc), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)NetmapDesc_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
(reprfunc)NetmapDesc_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 | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"Netmap descriptor object", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
NetmapDesc_methods, /* tp_methods */
NetmapDesc_members, /* tp_members */
NetmapDesc_getseters, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)NetmapDesc_init, /* tp_init */
0, /* tp_alloc */
NetmapDesc_new, /* tp_new */
};