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Diffstat (limited to 'scripts/dpdk_nic_bind.py')
| -rwxr-xr-x | scripts/dpdk_nic_bind.py | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/scripts/dpdk_nic_bind.py b/scripts/dpdk_nic_bind.py new file mode 100755 index 00000000..08402227 --- /dev/null +++ b/scripts/dpdk_nic_bind.py @@ -0,0 +1,539 @@ +#! /usr/bin/python +# +# 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" ] + +# 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: + print "Error - no supported modules are loaded" + sys.exit(1) + + # 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) + exit(-1) + 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) + exit(-1) + 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): + """Unbind 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("<none>") + 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() |