[dpdk-dev,PATCHv8,5/6] pmdinfo.py: Add tool to query binaries for hw and other support information
diff mbox

Message ID 1466189185-21952-6-git-send-email-nhorman@tuxdriver.com
State Accepted, archived
Delegated to: Thomas Monjalon
Headers show

Commit Message

Neil Horman June 17, 2016, 6:46 p.m. UTC
This tool searches for the primer sting PMD_DRIVER_INFO= in any ELF binary,
and, if found parses the remainder of the string as a json encoded string,
outputting the results in either a human readable or raw, script parseable
format

Note that, in the case of dynamically linked applications, pmdinfo.py will
scan for implicitly linked PMDs by searching the specified binaries
.dynamic section for DT_NEEDED entries that contain the substring
librte_pmd.  The DT_RUNPATH, LD_LIBRARY_PATH, /usr/lib and /lib are
searched for these libraries, in that order

If a file is specified with no path, it is assumed to be a PMD DSO, and the
LD_LIBRARY_PATH, /usr/lib[64]/ and /lib[64] is searched for it

Currently the tool can output data in 3 formats:

a) raw, suitable for scripting, where the raw JSON strings are dumped out
b) table format (default) where hex pci ids are dumped in a table format
c) pretty, where a user supplied pci.ids file is used to print out vendor
and device strings

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Panu Matilainen <pmatilai@redhat.com>
CC: Bruce Richardson <bruce.richardson@intel.com>
CC: Thomas Monjalon <thomas.monjalon@6wind.com>
CC: Stephen Hemminger <stephen@networkplumber.org>
CC: Panu Matilainen <pmatilai@redhat.com>
---
 mk/rte.sdkinstall.mk |   2 +
 tools/pmdinfo.py     | 629 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 631 insertions(+)
 create mode 100755 tools/pmdinfo.py

Comments

Remy Horton June 29, 2016, 3:12 p.m. UTC | #1
'noon,

The tool does not work for static PMD libraries (e.g. librte_pmd_i40e.a) 
- is this an intended limitation?

DPDK doesn't to my knowledge have any coding guidelines for Python, so 
the comments below should be considered advisory rather than 
merge-blocking issues.


On 17/06/2016 19:46, Neil Horman wrote:
[..]
> +++ b/tools/pmdinfo.py
> @@ -0,0 +1,629 @@
> +#!/usr/bin/python
> +# -------------------------------------------------------------------------
> +# scripts/pmdinfo.py
> +#
> +# Utility to dump PMD_INFO_STRING support from an object file
> +#

No licence..?


> +# -------------------------------------------------------------------------
> +import os
> +import sys
> +from optparse import OptionParser
> +import string
> +import json
> +
> +# For running from development directory. It should take precedence over the
> +# installed pyelftools.
> +sys.path.insert(0, '.')

Aside from causing all the subsequent imports to have PEP8 errors, this 
does not looks like a good way of pulling in project-specific Python 
library installs. Usual method is either using virtualenv or the 
PYTHONPATH enviornment variable.


> +from elftools import __version__
> +from elftools.common.exceptions import ELFError
[..]
> +from elftools.dwarf.constants import (
> +    DW_LNS_copy, DW_LNS_set_file, DW_LNE_define_file)
> +from elftools.dwarf.callframe import CIE, FDE

According to PyLint, most of these imports are unused.


> +
> +
> +class Vendor:

Old style class definition. Using modern notation it is:

class Vendor(object):


> +    def report(self):
> +        print "\t%s\t%s" % (self.ID, self.name)
> +        for subID, subdev in self.subdevices.items():
> +            subdev.report()

subID unused. An underscore can be used as a placeholder for these types 
of loops.


> +    optparser.add_option("-t", "--table", dest="tblout",
> +                         help="output information on hw support as a hex table",

PEP8: pmdinfo.py:573:80: E501 line too long (80 > 79 characters)
Neil Horman June 29, 2016, 4:18 p.m. UTC | #2
On Wed, Jun 29, 2016 at 04:12:21PM +0100, Remy Horton wrote:
> 'noon,
> 
> The tool does not work for static PMD libraries (e.g. librte_pmd_i40e.a) -
> is this an intended limitation?
> 
Yes, because .a files are archives, not ELF files.  If you want to run pmdinfo
on an archive, you have to unarchive it first (ar x).  It would be the same if
you had bound them together with tar or zip.

> DPDK doesn't to my knowledge have any coding guidelines for Python, so the
> comments below should be considered advisory rather than merge-blocking
> issues.
> 
> 
> On 17/06/2016 19:46, Neil Horman wrote:
> [..]
> > +++ b/tools/pmdinfo.py
> > @@ -0,0 +1,629 @@
> > +#!/usr/bin/python
> > +# -------------------------------------------------------------------------
> > +# scripts/pmdinfo.py
> > +#
> > +# Utility to dump PMD_INFO_STRING support from an object file
> > +#
> 
> No licence..?
> 
Its BSD, same as the others, I let the README cover that.  We can include
it if we must, though we have lots of examples where we haven't bothered


> 
> > +# -------------------------------------------------------------------------
> > +import os
> > +import sys
> > +from optparse import OptionParser
> > +import string
> > +import json
> > +
> > +# For running from development directory. It should take precedence over the
> > +# installed pyelftools.
> > +sys.path.insert(0, '.')
> 
> Aside from causing all the subsequent imports to have PEP8 errors, this does
> not looks like a good way of pulling in project-specific Python library
> installs. Usual method is either using virtualenv or the PYTHONPATH
> enviornment variable.
> 
Nope, pep8 doesn't complain about this at all:
[nhorman@hmsreliant tools]$ pep8 ./pmdinfo.py 
pmdinfo.py:573:80: E501 line too long (80 > 79 characters)
[nhorman@hmsreliant tools]$ 

The line too long snuck in there recently on the last round of formatting errors


> 
> > +from elftools import __version__
> > +from elftools.common.exceptions import ELFError
> [..]
> > +from elftools.dwarf.constants import (
> > +    DW_LNS_copy, DW_LNS_set_file, DW_LNE_define_file)
> > +from elftools.dwarf.callframe import CIE, FDE
> 
> According to PyLint, most of these imports are unused.
Some of them are, the code was borrowed from some examples.

> 
> 
> > +
> > +
> > +class Vendor:
> 
> Old style class definition. Using modern notation it is:
> 
> class Vendor(object):
> 
> 
> > +    def report(self):
> > +        print "\t%s\t%s" % (self.ID, self.name)
> > +        for subID, subdev in self.subdevices.items():
> > +            subdev.report()
> 
> subID unused. An underscore can be used as a placeholder for these types of
> loops.
> 
> 
> > +    optparser.add_option("-t", "--table", dest="tblout",
> > +                         help="output information on hw support as a hex table",
> 
> PEP8: pmdinfo.py:573:80: E501 line too long (80 > 79 characters)
> 
As you note, none of these are catastrophic.  I'm willing to fix them up, but
given, the number of iterations I've gone through for minior nits, I would
prefer to see it incorporated before I post this series again.

Neil

> 
>
Remy Horton June 30, 2016, 7:45 a.m. UTC | #3
On 29/06/2016 17:18, Neil Horman wrote:
> On Wed, Jun 29, 2016 at 04:12:21PM +0100, Remy Horton wrote:
>> 'noon,
[..]
>> No licence..?
>>
> Its BSD, same as the others, I let the README cover that.  We can include
> it if we must, though we have lots of examples where we haven't bothered

Ok. The DPDK repo has a mix of BSD and GPL licenced files, so probably 
bit more critical than in other projects.


> Nope, pep8 doesn't complain about this at all:
> [nhorman@hmsreliant tools]$ pep8 ./pmdinfo.py
> pmdinfo.py:573:80: E501 line too long (80 > 79 characters)
> [nhorman@hmsreliant tools]$

Hmm..

[remy@VM tools]$ pep8 pmdinfo.py
pmdinfo.py:19:1: E402 module level import not at top of file
pmdinfo.py:20:1: E402 module level import not at top of file
pmdinfo.py:21:1: E402 module level import not at top of file
pmdinfo.py:23:1: E402 module level import not at top of file
pmdinfo.py:24:1: E402 module level import not at top of file
pmdinfo.py:25:1: E402 module level import not at top of file
pmdinfo.py:26:1: E402 module level import not at top of file
pmdinfo.py:27:1: E402 module level import not at top of file
pmdinfo.py:28:1: E402 module level import not at top of file
pmdinfo.py:32:1: E402 module level import not at top of file
pmdinfo.py:33:1: E402 module level import not at top of file
pmdinfo.py:42:1: E402 module level import not at top of file
pmdinfo.py:43:1: E402 module level import not at top of file
pmdinfo.py:44:1: E402 module level import not at top of file
pmdinfo.py:49:1: E402 module level import not at top of file
pmdinfo.py:51:1: E402 module level import not at top of file
pmdinfo.py:573:80: E501 line too long (80 > 79 characters)
[remy@VM tools]$ pep8 --version
1.7.0

To be fair the Python lot seem to add bucketloads of extra checks to 
PEP8/PyLint with every release.


> As you note, none of these are catastrophic.  I'm willing to fix them up, but
> given, the number of iterations I've gone through for minior nits, I would
> prefer to see it incorporated before I post this series again.

I agree. Merge first and ask questions later.. :)

..Remy

Patch
diff mbox

diff --git a/mk/rte.sdkinstall.mk b/mk/rte.sdkinstall.mk
index 1f3b59c..b0d985c 100644
--- a/mk/rte.sdkinstall.mk
+++ b/mk/rte.sdkinstall.mk
@@ -128,6 +128,8 @@  install-runtime:
 	                           $(DESTDIR)$(sbindir)/dpdk_nic_bind)
 	$(Q)$(call rte_symlink,    $(DESTDIR)$(bindir)/pmdinfogen, \
 				   $(DESTDIR)$(bindir)/dpdk_pmdinfogen)
+	$(Q)$(call rte_symlink,    $(DESTDIR)$(datadir)/tools/pmdinfo.py, \
+				   $(DESTDIR)$(bindir)/dpdk_pmdinfo)
 
 install-kmod:
 ifneq ($(wildcard $O/kmod/*),)
diff --git a/tools/pmdinfo.py b/tools/pmdinfo.py
new file mode 100755
index 0000000..e531154
--- /dev/null
+++ b/tools/pmdinfo.py
@@ -0,0 +1,629 @@ 
+#!/usr/bin/python
+# -------------------------------------------------------------------------
+# scripts/pmdinfo.py
+#
+# Utility to dump PMD_INFO_STRING support from an object file
+#
+# -------------------------------------------------------------------------
+import os
+import sys
+from optparse import OptionParser
+import string
+import json
+
+# For running from development directory. It should take precedence over the
+# installed pyelftools.
+sys.path.insert(0, '.')
+
+
+from elftools import __version__
+from elftools.common.exceptions import ELFError
+from elftools.common.py3compat import (
+    ifilter, byte2int, bytes2str, itervalues, str2bytes)
+from elftools.elf.elffile import ELFFile
+from elftools.elf.dynamic import DynamicSection, DynamicSegment
+from elftools.elf.enums import ENUM_D_TAG
+from elftools.elf.segments import InterpSegment
+from elftools.elf.sections import SymbolTableSection
+from elftools.elf.gnuversions import (
+    GNUVerSymSection, GNUVerDefSection,
+    GNUVerNeedSection,
+)
+from elftools.elf.relocation import RelocationSection
+from elftools.elf.descriptions import (
+    describe_ei_class, describe_ei_data, describe_ei_version,
+    describe_ei_osabi, describe_e_type, describe_e_machine,
+    describe_e_version_numeric, describe_p_type, describe_p_flags,
+    describe_sh_type, describe_sh_flags,
+    describe_symbol_type, describe_symbol_bind, describe_symbol_visibility,
+    describe_symbol_shndx, describe_reloc_type, describe_dyn_tag,
+    describe_ver_flags,
+)
+from elftools.elf.constants import E_FLAGS
+from elftools.dwarf.dwarfinfo import DWARFInfo
+from elftools.dwarf.descriptions import (
+    describe_reg_name, describe_attr_value, set_global_machine_arch,
+    describe_CFI_instructions, describe_CFI_register_rule,
+    describe_CFI_CFA_rule,
+)
+from elftools.dwarf.constants import (
+    DW_LNS_copy, DW_LNS_set_file, DW_LNE_define_file)
+from elftools.dwarf.callframe import CIE, FDE
+
+raw_output = False
+pcidb = None
+
+# ===========================================
+
+
+class Vendor:
+    """
+    Class for vendors. This is the top level class
+    for the devices belong to a specific vendor.
+    self.devices is the device dictionary
+    subdevices are in each device.
+    """
+
+    def __init__(self, vendorStr):
+        """
+        Class initializes with the raw line from pci.ids
+        Parsing takes place inside __init__
+        """
+        self.ID = vendorStr.split()[0]
+        self.name = vendorStr.replace("%s " % self.ID, "").rstrip()
+        self.devices = {}
+
+    def addDevice(self, deviceStr):
+        """
+        Adds a device to self.devices
+        takes the raw line from pci.ids
+        """
+        s = deviceStr.strip()
+        devID = s.split()[0]
+        if devID in self.devices:
+            pass
+        else:
+            self.devices[devID] = Device(deviceStr)
+
+    def report(self):
+        print self.ID, self.name
+        for id, dev in self.devices.items():
+            dev.report()
+
+    def find_device(self, devid):
+        # convert to a hex string and remove 0x
+        devid = hex(devid)[2:]
+        try:
+            return self.devices[devid]
+        except:
+            return Device("%s  Unknown Device" % devid)
+
+
+class Device:
+
+    def __init__(self, deviceStr):
+        """
+        Class for each device.
+        Each vendor has its own devices dictionary.
+        """
+        s = deviceStr.strip()
+        self.ID = s.split()[0]
+        self.name = s.replace("%s  " % self.ID, "")
+        self.subdevices = {}
+
+    def report(self):
+        print "\t%s\t%s" % (self.ID, self.name)
+        for subID, subdev in self.subdevices.items():
+            subdev.report()
+
+    def addSubDevice(self, subDeviceStr):
+        """
+        Adds a subvendor, subdevice to device.
+        Uses raw line from pci.ids
+        """
+        s = subDeviceStr.strip()
+        spl = s.split()
+        subVendorID = spl[0]
+        subDeviceID = spl[1]
+        subDeviceName = s.split("  ")[-1]
+        devID = "%s:%s" % (subVendorID, subDeviceID)
+        self.subdevices[devID] = SubDevice(
+            subVendorID, subDeviceID, subDeviceName)
+
+    def find_subid(self, subven, subdev):
+        subven = hex(subven)[2:]
+        subdev = hex(subdev)[2:]
+        devid = "%s:%s" % (subven, subdev)
+
+        try:
+            return self.subdevices[devid]
+        except:
+            if (subven == "ffff" and subdev == "ffff"):
+                return SubDevice("ffff", "ffff", "(All Subdevices)")
+            else:
+                return SubDevice(subven, subdev, "(Unknown Subdevice)")
+
+
+class SubDevice:
+    """
+    Class for subdevices.
+    """
+
+    def __init__(self, vendor, device, name):
+        """
+        Class initializes with vendorid, deviceid and name
+        """
+        self.vendorID = vendor
+        self.deviceID = device
+        self.name = name
+
+    def report(self):
+        print "\t\t%s\t%s\t%s" % (self.vendorID, self.deviceID, self.name)
+
+
+class PCIIds:
+    """
+    Top class for all pci.ids entries.
+    All queries will be asked to this class.
+    PCIIds.vendors["0e11"].devices["0046"].\
+    subdevices["0e11:4091"].name  =  "Smart Array 6i"
+    """
+
+    def __init__(self, filename):
+        """
+        Prepares the directories.
+        Checks local data file.
+        Tries to load from local, if not found, downloads from web
+        """
+        self.version = ""
+        self.date = ""
+        self.vendors = {}
+        self.contents = None
+        self.readLocal(filename)
+        self.parse()
+
+    def reportVendors(self):
+        """Reports the vendors
+        """
+        for vid, v in self.vendors.items():
+            print v.ID, v.name
+
+    def report(self, vendor=None):
+        """
+        Reports everything for all vendors or a specific vendor
+        PCIIds.report()  reports everything
+        PCIIDs.report("0e11") reports only "Compaq Computer Corporation"
+        """
+        if vendor is not None:
+            self.vendors[vendor].report()
+        else:
+            for vID, v in self.vendors.items():
+                v.report()
+
+    def find_vendor(self, vid):
+        # convert vid to a hex string and remove the 0x
+        vid = hex(vid)[2:]
+
+        try:
+            return self.vendors[vid]
+        except:
+            return Vendor("%s Unknown Vendor" % (vid))
+
+    def findDate(self, content):
+        for l in content:
+            if l.find("Date:") > -1:
+                return l.split()[-2].replace("-", "")
+        return None
+
+    def parse(self):
+        if len(self.contents) < 1:
+            print "data/%s-pci.ids not found" % self.date
+        else:
+            vendorID = ""
+            deviceID = ""
+            for l in self.contents:
+                if l[0] == "#":
+                    continue
+                elif len(l.strip()) == 0:
+                    continue
+                else:
+                    if l.find("\t\t") == 0:
+                        self.vendors[vendorID].devices[
+                            deviceID].addSubDevice(l)
+                    elif l.find("\t") == 0:
+                        deviceID = l.strip().split()[0]
+                        self.vendors[vendorID].addDevice(l)
+                    else:
+                        vendorID = l.split()[0]
+                        self.vendors[vendorID] = Vendor(l)
+
+    def readLocal(self, filename):
+        """
+        Reads the local file
+        """
+        self.contents = open(filename).readlines()
+        self.date = self.findDate(self.contents)
+
+    def loadLocal(self):
+        """
+        Loads database from local. If there is no file,
+        it creates a new one from web
+        """
+        self.date = idsfile[0].split("/")[1].split("-")[0]
+        self.readLocal()
+
+
+# =======================================
+
+def search_file(filename, search_path):
+    """ Given a search path, find file with requested name """
+    for path in string.split(search_path, ":"):
+        candidate = os.path.join(path, filename)
+        if os.path.exists(candidate):
+            return os.path.abspath(candidate)
+    return None
+
+
+class ReadElf(object):
+    """ display_* methods are used to emit output into the output stream
+    """
+
+    def __init__(self, file, output):
+        """ file:
+                stream object with the ELF file to read
+
+            output:
+                output stream to write to
+        """
+        self.elffile = ELFFile(file)
+        self.output = output
+
+        # Lazily initialized if a debug dump is requested
+        self._dwarfinfo = None
+
+        self._versioninfo = None
+
+    def _section_from_spec(self, spec):
+        """ Retrieve a section given a "spec" (either number or name).
+            Return None if no such section exists in the file.
+        """
+        try:
+            num = int(spec)
+            if num < self.elffile.num_sections():
+                return self.elffile.get_section(num)
+            else:
+                return None
+        except ValueError:
+            # Not a number. Must be a name then
+            return self.elffile.get_section_by_name(str2bytes(spec))
+
+    def pretty_print_pmdinfo(self, pmdinfo):
+        global pcidb
+
+        for i in pmdinfo["pci_ids"]:
+            vendor = pcidb.find_vendor(i[0])
+            device = vendor.find_device(i[1])
+            subdev = device.find_subid(i[2], i[3])
+            print("%s (%s) : %s (%s) %s" %
+                  (vendor.name, vendor.ID, device.name,
+                   device.ID, subdev.name))
+
+    def parse_pmd_info_string(self, mystring):
+        global raw_output
+        global pcidb
+
+        optional_pmd_info = [{'id': 'params', 'tag': 'PMD PARAMETERS'}]
+
+        i = mystring.index("=")
+        mystring = mystring[i + 2:]
+        pmdinfo = json.loads(mystring)
+
+        if raw_output:
+            print(pmdinfo)
+            return
+
+        print("PMD NAME: " + pmdinfo["name"])
+        for i in optional_pmd_info:
+            try:
+                print("%s: %s" % (i['tag'], pmdinfo[i['id']]))
+            except KeyError as e:
+                continue
+
+        if (len(pmdinfo["pci_ids"]) != 0):
+            print("PMD HW SUPPORT:")
+            if pcidb is not None:
+                self.pretty_print_pmdinfo(pmdinfo)
+            else:
+                print("VENDOR\t DEVICE\t SUBVENDOR\t SUBDEVICE")
+                for i in pmdinfo["pci_ids"]:
+                    print("0x%04x\t 0x%04x\t 0x%04x\t\t 0x%04x" %
+                          (i[0], i[1], i[2], i[3]))
+
+        print("")
+
+    def display_pmd_info_strings(self, section_spec):
+        """ Display a strings dump of a section. section_spec is either a
+            section number or a name.
+        """
+        section = self._section_from_spec(section_spec)
+        if section is None:
+            return
+
+        data = section.data()
+        dataptr = 0
+
+        while dataptr < len(data):
+            while (dataptr < len(data) and
+                    not (32 <= byte2int(data[dataptr]) <= 127)):
+                dataptr += 1
+
+            if dataptr >= len(data):
+                break
+
+            endptr = dataptr
+            while endptr < len(data) and byte2int(data[endptr]) != 0:
+                endptr += 1
+
+            mystring = bytes2str(data[dataptr:endptr])
+            rc = mystring.find("PMD_INFO_STRING")
+            if (rc != -1):
+                self.parse_pmd_info_string(mystring)
+
+            dataptr = endptr
+
+    def find_librte_eal(self, section):
+        for tag in section.iter_tags():
+            if tag.entry.d_tag == 'DT_NEEDED':
+                if "librte_eal" in tag.needed:
+                    return tag.needed
+        return None
+
+    def search_for_autoload_path(self):
+        scanelf = self
+        scanfile = None
+        library = None
+
+        section = self._section_from_spec(".dynamic")
+        try:
+            eallib = self.find_librte_eal(section)
+            if eallib is not None:
+                ldlibpath = os.environ.get('LD_LIBRARY_PATH')
+                if ldlibpath is None:
+                    ldlibpath = ""
+                dtr = self.get_dt_runpath(section)
+                library = search_file(eallib,
+                                      dtr + ":" + ldlibpath +
+                                      ":/usr/lib64:/lib64:/usr/lib:/lib")
+                if library is None:
+                    return (None, None)
+                if raw_output is False:
+                    print("Scanning for autoload path in %s" % library)
+                scanfile = open(library, 'rb')
+                scanelf = ReadElf(scanfile, sys.stdout)
+        except AttributeError:
+            # Not a dynamic binary
+            pass
+        except ELFError:
+            scanfile.close()
+            return (None, None)
+
+        section = scanelf._section_from_spec(".rodata")
+        if section is None:
+            if scanfile is not None:
+                scanfile.close()
+            return (None, None)
+
+        data = section.data()
+        dataptr = 0
+
+        while dataptr < len(data):
+            while (dataptr < len(data) and
+                    not (32 <= byte2int(data[dataptr]) <= 127)):
+                dataptr += 1
+
+            if dataptr >= len(data):
+                break
+
+            endptr = dataptr
+            while endptr < len(data) and byte2int(data[endptr]) != 0:
+                endptr += 1
+
+            mystring = bytes2str(data[dataptr:endptr])
+            rc = mystring.find("DPDK_PLUGIN_PATH")
+            if (rc != -1):
+                rc = mystring.find("=")
+                return (mystring[rc + 1:], library)
+
+            dataptr = endptr
+        if scanfile is not None:
+            scanfile.close()
+        return (None, None)
+
+    def get_dt_runpath(self, dynsec):
+        for tag in dynsec.iter_tags():
+            if tag.entry.d_tag == 'DT_RUNPATH':
+                return tag.runpath
+        return ""
+
+    def process_dt_needed_entries(self):
+        """ Look to see if there are any DT_NEEDED entries in the binary
+            And process those if there are
+        """
+        global raw_output
+        runpath = ""
+        ldlibpath = os.environ.get('LD_LIBRARY_PATH')
+        if ldlibpath is None:
+            ldlibpath = ""
+
+        dynsec = self._section_from_spec(".dynamic")
+        try:
+            runpath = self.get_dt_runpath(dynsec)
+        except AttributeError:
+            # dynsec is None, just return
+            return
+
+        for tag in dynsec.iter_tags():
+            if tag.entry.d_tag == 'DT_NEEDED':
+                rc = tag.needed.find("librte_pmd")
+                if (rc != -1):
+                    library = search_file(tag.needed,
+                                          runpath + ":" + ldlibpath +
+                                          ":/usr/lib64:/lib64:/usr/lib:/lib")
+                    if library is not None:
+                        if raw_output is False:
+                            print("Scanning %s for pmd information" % library)
+                        with open(library, 'rb') as file:
+                            try:
+                                libelf = ReadElf(file, sys.stdout)
+                            except ELFError as e:
+                                print("%s is no an ELF file" % library)
+                                continue
+                            libelf.process_dt_needed_entries()
+                            libelf.display_pmd_info_strings(".rodata")
+                            file.close()
+
+
+def scan_autoload_path(autoload_path):
+    global raw_output
+
+    if os.path.exists(autoload_path) is False:
+        return
+
+    try:
+        dirs = os.listdir(autoload_path)
+    except OSError as e:
+        # Couldn't read the directory, give up
+        return
+
+    for d in dirs:
+        dpath = os.path.join(autoload_path, d)
+        if os.path.isdir(dpath):
+            scan_autoload_path(dpath)
+        if os.path.isfile(dpath):
+            try:
+                file = open(dpath, 'rb')
+                readelf = ReadElf(file, sys.stdout)
+            except ELFError as e:
+                # this is likely not an elf file, skip it
+                continue
+            except IOError as e:
+                # No permission to read the file, skip it
+                continue
+
+            if raw_output is False:
+                print("Hw Support for library %s" % d)
+            readelf.display_pmd_info_strings(".rodata")
+            file.close()
+
+
+def scan_for_autoload_pmds(dpdk_path):
+    """
+    search the specified application or path for a pmd autoload path
+    then scan said path for pmds and report hw support
+    """
+    global raw_output
+
+    if (os.path.isfile(dpdk_path) is False):
+        if raw_output is False:
+            print("Must specify a file name")
+        return
+
+    file = open(dpdk_path, 'rb')
+    try:
+        readelf = ReadElf(file, sys.stdout)
+    except ElfError as e:
+        if raw_output is False:
+            print("Unable to parse %s" % file)
+        return
+
+    (autoload_path, scannedfile) = readelf.search_for_autoload_path()
+    if (autoload_path is None or autoload_path is ""):
+        if (raw_output is False):
+            print("No autoload path configured in %s" % dpdk_path)
+        return
+    if (raw_output is False):
+        if (scannedfile is None):
+            scannedfile = dpdk_path
+        print("Found autoload path %s in %s" % (autoload_path, scannedfile))
+
+    file.close()
+    if (raw_output is False):
+        print("Discovered Autoload HW Support:")
+    scan_autoload_path(autoload_path)
+    return
+
+
+def main(stream=None):
+    global raw_output
+    global pcidb
+
+    optparser = OptionParser(
+        usage='usage: %prog [-hrtp] [-d <pci id file] <elf-file>',
+        description="Dump pmd hardware support info",
+        add_help_option=True,
+        prog='pmdinfo.py')
+    optparser.add_option('-r', '--raw',
+                         action='store_true', dest='raw_output',
+                         help='Dump raw json strings')
+    optparser.add_option("-d", "--pcidb", dest="pcifile",
+                         help="specify a pci database "
+                              "to get vendor names from",
+                         default="/usr/share/hwdata/pci.ids", metavar="FILE")
+    optparser.add_option("-t", "--table", dest="tblout",
+                         help="output information on hw support as a hex table",
+                         action='store_true')
+    optparser.add_option("-p", "--plugindir", dest="pdir",
+                         help="scan dpdk for autoload plugins",
+                         action='store_true')
+
+    options, args = optparser.parse_args()
+
+    if options.raw_output:
+        raw_output = True
+
+    if options.pcifile:
+        pcidb = PCIIds(options.pcifile)
+        if pcidb is None:
+            print("Pci DB file not found")
+            exit(1)
+
+    if options.tblout:
+        options.pcifile = None
+        pcidb = None
+
+    if (len(args) == 0):
+        optparser.print_usage()
+        exit(1)
+
+    if options.pdir is True:
+        exit(scan_for_autoload_pmds(args[0]))
+
+    ldlibpath = os.environ.get('LD_LIBRARY_PATH')
+    if (ldlibpath is None):
+        ldlibpath = ""
+
+    if (os.path.exists(args[0]) is True):
+        myelffile = args[0]
+    else:
+        myelffile = search_file(
+            args[0], ldlibpath + ":/usr/lib64:/lib64:/usr/lib:/lib")
+
+    if (myelffile is None):
+        print("File not found")
+        sys.exit(1)
+
+    with open(myelffile, 'rb') as file:
+        try:
+            readelf = ReadElf(file, sys.stdout)
+            readelf.process_dt_needed_entries()
+            readelf.display_pmd_info_strings(".rodata")
+            sys.exit(0)
+
+        except ELFError as ex:
+            sys.stderr.write('ELF error: %s\n' % ex)
+            sys.exit(1)
+
+
+# -------------------------------------------------------------------------
+if __name__ == '__main__':
+    main()