#! /usr/bin/python2 # # BSD LICENSE # # Copyright(c) 2010-2014 Intel Corporation. All rights reserved. # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * 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. # * Neither the name of Intel Corporation nor the names of its # contributors may be used to endorse or promote products derived # from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT # OWNER 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. # import sys, os, getopt, subprocess from os.path import exists, abspath, dirname, basename # The PCI device class for ETHERNET devices ETHERNET_CLASS = "0200" # global dict ethernet devices present. Dictionary indexed by PCI address. # Each device within this is itself a dictionary of device properties devices = {} # list of supported DPDK drivers dpdk_drivers = [ "igb_uio", "vfio-pci", "uio_pci_generic" ] # command-line arg flags b_flag = None status_flag = False force_flag = False args = [] def usage(): '''Print usage information for the program''' argv0 = basename(sys.argv[0]) print """ Usage: ------ %(argv0)s [options] DEVICE1 DEVICE2 .... where DEVICE1, DEVICE2 etc, are specified via PCI "domain:bus:slot.func" syntax or "bus:slot.func" syntax. For devices bound to Linux kernel drivers, they may also be referred to by Linux interface name e.g. eth0, eth1, em0, em1, etc. Options: --help, --usage: Display usage information and quit --status: Print the current status of all known network interfaces. For each device, it displays the PCI domain, bus, slot and function, along with a text description of the device. Depending upon whether the device is being used by a kernel driver, the igb_uio driver, or no driver, other relevant information will be displayed: * the Linux interface name e.g. if=eth0 * the driver being used e.g. drv=igb_uio * any suitable drivers not currently using that device e.g. unused=igb_uio NOTE: if this flag is passed along with a bind/unbind option, the status display will always occur after the other operations have taken place. -b driver, --bind=driver: Select the driver to use or \"none\" to unbind the device -u, --unbind: Unbind a device (Equivalent to \"-b none\") --force: By default, devices which are used by Linux - as indicated by having routes in the routing table - cannot be modified. Using the --force flag overrides this behavior, allowing active links to be forcibly unbound. WARNING: This can lead to loss of network connection and should be used with caution. Examples: --------- To display current device status: %(argv0)s --status To bind eth1 from the current driver and move to use igb_uio %(argv0)s --bind=igb_uio eth1 To unbind 0000:01:00.0 from using any driver %(argv0)s -u 0000:01:00.0 To bind 0000:02:00.0 and 0000:02:00.1 to the ixgbe kernel driver %(argv0)s -b ixgbe 02:00.0 02:00.1 """ % locals() # replace items from local variables # This is roughly compatible with check_output function in subprocess module # which is only available in python 2.7. def check_output(args, stderr=None): '''Run a command and capture its output''' return subprocess.Popen(args, stdout=subprocess.PIPE, stderr=stderr).communicate()[0] def find_module(mod): '''find the .ko file for kernel module named mod. Searches the $RTE_SDK/$RTE_TARGET directory, the kernel modules directory and finally under the parent directory of the script ''' # check $RTE_SDK/$RTE_TARGET directory if 'RTE_SDK' in os.environ and 'RTE_TARGET' in os.environ: path = "%s/%s/kmod/%s.ko" % (os.environ['RTE_SDK'],\ os.environ['RTE_TARGET'], mod) if exists(path): return path # check using depmod try: depmod_out = check_output(["modinfo", "-n", mod], \ stderr=subprocess.STDOUT).lower() if "error" not in depmod_out: path = depmod_out.strip() if exists(path): return path except: # if modinfo can't find module, it fails, so continue pass # check for a copy based off current path tools_dir = dirname(abspath(sys.argv[0])) if (tools_dir.endswith("tools")): base_dir = dirname(tools_dir) find_out = check_output(["find", base_dir, "-name", mod + ".ko"]) if len(find_out) > 0: #something matched path = find_out.splitlines()[0] if exists(path): return path def check_modules(): '''Checks that igb_uio is loaded''' global dpdk_drivers fd = file("/proc/modules") loaded_mods = fd.readlines() fd.close() # list of supported modules mods = [{"Name" : driver, "Found" : False} for driver in dpdk_drivers] # first check if module is loaded for line in loaded_mods: for mod in mods: if line.startswith(mod["Name"]): mod["Found"] = True # special case for vfio_pci (module is named vfio-pci, # but its .ko is named vfio_pci) elif line.replace("_", "-").startswith(mod["Name"]): mod["Found"] = True # check if we have at least one loaded module if True not in [mod["Found"] for mod in mods] and b_flag is not None: if b_flag in dpdk_drivers: print "Error - no supported modules(DPDK driver) are loaded" sys.exit(1) else: print "Warning - no supported modules(DPDK driver) are loaded" # change DPDK driver list to only contain drivers that are loaded dpdk_drivers = [mod["Name"] for mod in mods if mod["Found"]] def has_driver(dev_id): '''return true if a device is assigned to a driver. False otherwise''' return "Driver_str" in devices[dev_id] def get_pci_device_details(dev_id): '''This function gets additional details for a PCI device''' device = {} extra_info = check_output(["lspci", "-vmmks", dev_id]).splitlines() # parse lspci details for line in extra_info: if len(line) == 0: continue name, value = line.split("\t", 1) name = name.strip(":") + "_str" device[name] = value # check for a unix interface name sys_path = "/sys/bus/pci/devices/%s/net/" % dev_id if exists(sys_path): device["Interface"] = ",".join(os.listdir(sys_path)) else: device["Interface"] = "" # check if a port is used for ssh connection device["Ssh_if"] = False device["Active"] = "" return device def get_nic_details(): '''This function populates the "devices" dictionary. The keys used are the pci addresses (domain:bus:slot.func). The values are themselves dictionaries - one for each NIC.''' global devices global dpdk_drivers # clear any old data devices = {} # first loop through and read details for all devices # request machine readable format, with numeric IDs dev = {}; dev_lines = check_output(["lspci", "-Dvmmn"]).splitlines() for dev_line in dev_lines: if (len(dev_line) == 0): if dev["Class"] == ETHERNET_CLASS: #convert device and vendor ids to numbers, then add to global dev["Vendor"] = int(dev["Vendor"],16) dev["Device"] = int(dev["Device"],16) devices[dev["Slot"]] = dict(dev) # use dict to make copy of dev else: name, value = dev_line.split("\t", 1) dev[name.rstrip(":")] = value # check what is the interface if any for an ssh connection if # any to this host, so we can mark it later. ssh_if = [] route = check_output(["ip", "-o", "route"]) # filter out all lines for 169.254 routes route = "\n".join(filter(lambda ln: not ln.startswith("169.254"), route.splitlines())) rt_info = route.split() for i in xrange(len(rt_info) - 1): if rt_info[i] == "dev": ssh_if.append(rt_info[i+1]) # based on the basic info, get extended text details for d in devices.keys(): # get additional info and add it to existing data devices[d] = dict(devices[d].items() + get_pci_device_details(d).items()) for _if in ssh_if: if _if in devices[d]["Interface"].split(","): devices[d]["Ssh_if"] = True devices[d]["Active"] = "*Active*" break; # add igb_uio to list of supporting modules if needed if "Module_str" in devices[d]: for driver in dpdk_drivers: if driver not in devices[d]["Module_str"]: devices[d]["Module_str"] = devices[d]["Module_str"] + ",%s" % driver else: devices[d]["Module_str"] = ",".join(dpdk_drivers) # make sure the driver and module strings do not have any duplicates if has_driver(d): modules = devices[d]["Module_str"].split(",") if devices[d]["Driver_str"] in modules: modules.remove(devices[d]["Driver_str"]) devices[d]["Module_str"] = ",".join(modules) def dev_id_from_dev_name(dev_name): '''Take a device "name" - a string passed in by user to identify a NIC device, and determine the device id - i.e. the domain:bus:slot.func - for it, which can then be used to index into the devices array''' dev = None # check if it's already a suitable index if dev_name in devices: return dev_name # check if it's an index just missing the domain part elif "0000:" + dev_name in devices: return "0000:" + dev_name else: # check if it's an interface name, e.g. eth1 for d in devices.keys(): if dev_name in devices[d]["Interface"].split(","): return devices[d]["Slot"] # if nothing else matches - error print "Unknown device: %s. " \ "Please specify device in \"bus:slot.func\" format" % dev_name sys.exit(1) def unbind_one(dev_id, force): '''Unbind the device identified by "dev_id" from its current driver''' dev = devices[dev_id] if not has_driver(dev_id): print "%s %s %s is not currently managed by any driver\n" % \ (dev["Slot"], dev["Device_str"], dev["Interface"]) return # prevent us disconnecting ourselves if dev["Ssh_if"] and not force: print "Routing table indicates that interface %s is active" \ ". Skipping unbind" % (dev_id) return # write to /sys to unbind filename = "/sys/bus/pci/drivers/%s/unbind" % dev["Driver_str"] try: f = open(filename, "a") except: print "Error: unbind failed for %s - Cannot open %s" % (dev_id, filename) sys/exit(1) f.write(dev_id) f.close() def bind_one(dev_id, driver, force): '''Bind the device given by "dev_id" to the driver "driver". If the device is already bound to a different driver, it will be unbound first''' dev = devices[dev_id] saved_driver = None # used to rollback any unbind in case of failure # prevent disconnection of our ssh session if dev["Ssh_if"] and not force: print "Routing table indicates that interface %s is active" \ ". Not modifying" % (dev_id) return # unbind any existing drivers we don't want if has_driver(dev_id): if dev["Driver_str"] == driver: print "%s already bound to driver %s, skipping\n" % (dev_id, driver) return else: saved_driver = dev["Driver_str"] unbind_one(dev_id, force) dev["Driver_str"] = "" # clear driver string # if we are binding to one of DPDK drivers, add PCI id's to that driver if driver in dpdk_drivers: filename = "/sys/bus/pci/drivers/%s/new_id" % driver try: f = open(filename, "w") except: print "Error: bind failed for %s - Cannot open %s" % (dev_id, filename) return try: f.write("%04x %04x" % (dev["Vendor"], dev["Device"])) f.close() except: print "Error: bind failed for %s - Cannot write new PCI ID to " \ "driver %s" % (dev_id, driver) return # do the bind by writing to /sys filename = "/sys/bus/pci/drivers/%s/bind" % driver try: f = open(filename, "a") except: print "Error: bind failed for %s - Cannot open %s" % (dev_id, filename) if saved_driver is not None: # restore any previous driver bind_one(dev_id, saved_driver, force) return try: f.write(dev_id) f.close() except: # for some reason, closing dev_id after adding a new PCI ID to new_id # results in IOError. however, if the device was successfully bound, # we don't care for any errors and can safely ignore IOError tmp = get_pci_device_details(dev_id) if "Driver_str" in tmp and tmp["Driver_str"] == driver: return print "Error: bind failed for %s - Cannot bind to driver %s" % (dev_id, driver) if saved_driver is not None: # restore any previous driver bind_one(dev_id, saved_driver, force) return def unbind_all(dev_list, force=False): """Unbind method, takes a list of device locations""" dev_list = map(dev_id_from_dev_name, dev_list) for d in dev_list: unbind_one(d, force) def bind_all(dev_list, driver, force=False): """Bind method, takes a list of device locations""" global devices dev_list = map(dev_id_from_dev_name, dev_list) for d in dev_list: bind_one(d, driver, force) # when binding devices to a generic driver (i.e. one that doesn't have a # PCI ID table), some devices that are not bound to any other driver could # be bound even if no one has asked them to. hence, we check the list of # drivers again, and see if some of the previously-unbound devices were # erroneously bound. for d in devices.keys(): # skip devices that were already bound or that we know should be bound if "Driver_str" in devices[d] or d in dev_list: continue # update information about this device devices[d] = dict(devices[d].items() + get_pci_device_details(d).items()) # check if updated information indicates that the device was bound if "Driver_str" in devices[d]: unbind_one(d, force) def display_devices(title, dev_list, extra_params = None): '''Displays to the user the details of a list of devices given in "dev_list" The "extra_params" parameter, if given, should contain a string with %()s fields in it for replacement by the named fields in each device's dictionary.''' strings = [] # this holds the strings to print. We sort before printing print "\n%s" % title print "="*len(title) if len(dev_list) == 0: strings.append("") else: for dev in dev_list: if extra_params is not None: strings.append("%s '%s' %s" % (dev["Slot"], \ dev["Device_str"], extra_params % dev)) else: strings.append("%s '%s'" % (dev["Slot"], dev["Device_str"])) # sort before printing, so that the entries appear in PCI order strings.sort() print "\n".join(strings) # print one per line def show_status(): '''Function called when the script is passed the "--status" option. Displays to the user what devices are bound to the igb_uio driver, the kernel driver or to no driver''' global dpdk_drivers kernel_drv = [] dpdk_drv = [] no_drv = [] # split our list of devices into the three categories above for d in devices.keys(): if not has_driver(d): no_drv.append(devices[d]) continue if devices[d]["Driver_str"] in dpdk_drivers: dpdk_drv.append(devices[d]) else: kernel_drv.append(devices[d]) # print each category separately, so we can clearly see what's used by DPDK display_devices("Network devices using DPDK-compatible driver", dpdk_drv, \ "drv=%(Driver_str)s unused=%(Module_str)s") display_devices("Network devices using kernel driver", kernel_drv, "if=%(Interface)s drv=%(Driver_str)s unused=%(Module_str)s %(Active)s") display_devices("Other network devices", no_drv,\ "unused=%(Module_str)s") def parse_args(): '''Parses the command-line arguments given by the user and takes the appropriate action for each''' global b_flag global status_flag global force_flag global args if len(sys.argv) <= 1: usage() sys.exit(0) try: opts, args = getopt.getopt(sys.argv[1:], "b:u", ["help", "usage", "status", "force", "bind=", "unbind"]) except getopt.GetoptError, error: print str(error) print "Run '%s --usage' for further information" % sys.argv[0] sys.exit(1) for opt, arg in opts: if opt == "--help" or opt == "--usage": usage() sys.exit(0) if opt == "--status": status_flag = True if opt == "--force": force_flag = True if opt == "-b" or opt == "-u" or opt == "--bind" or opt == "--unbind": if b_flag is not None: print "Error - Only one bind or unbind may be specified\n" sys.exit(1) if opt == "-u" or opt == "--unbind": b_flag = "none" else: b_flag = arg def do_arg_actions(): '''do the actual action requested by the user''' global b_flag global status_flag global force_flag global args if b_flag is None and not status_flag: print "Error: No action specified for devices. Please give a -b or -u option" print "Run '%s --usage' for further information" % sys.argv[0] sys.exit(1) if b_flag is not None and len(args) == 0: print "Error: No devices specified." print "Run '%s --usage' for further information" % sys.argv[0] sys.exit(1) if b_flag == "none" or b_flag == "None": unbind_all(args, force_flag) elif b_flag is not None: bind_all(args, b_flag, force_flag) if status_flag: if b_flag is not None: get_nic_details() # refresh if we have changed anything show_status() def main(): '''program main function''' parse_args() check_modules() get_nic_details() do_arg_actions() if __name__ == "__main__": main()