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pci: make it possible to keep devices bound to uio

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Binding code has been refactored as well.

Signed-off-by: Intel
This commit is contained in:
Intel 2012-12-20 00:00:00 +01:00 committed by Thomas Monjalon
parent acabcb6c3f
commit d6537e6a74
8 changed files with 674 additions and 59 deletions
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1
config/defconfig_i686-default-linuxapp-gcc
View File

@ -108,6 +108,7 @@ CONFIG_RTE_LOG_HISTORY=256
CONFIG_RTE_LIBEAL_USE_HPET=y
CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID=n
CONFIG_RTE_EAL_ALWAYS_PANIC_ON_ERROR=n
CONFIG_RTE_EAL_UNBIND_PORTS=n
#
# Compile Environment Abstraction Layer for linux

1
config/defconfig_i686-default-linuxapp-icc
View File

@ -108,6 +108,7 @@ CONFIG_RTE_LOG_HISTORY=256
CONFIG_RTE_LIBEAL_USE_HPET=y
CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID=n
CONFIG_RTE_EAL_ALWAYS_PANIC_ON_ERROR=n
CONFIG_RTE_EAL_UNBIND_PORTS=n
#
# Compile Environment Abstraction Layer for linux

1
config/defconfig_x86_64-default-linuxapp-gcc
View File

@ -108,6 +108,7 @@ CONFIG_RTE_LOG_HISTORY=256
CONFIG_RTE_LIBEAL_USE_HPET=y
CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID=n
CONFIG_RTE_EAL_ALWAYS_PANIC_ON_ERROR=n
CONFIG_RTE_EAL_UNBIND_PORTS=n
#
# Compile Environment Abstraction Layer for linux

1
config/defconfig_x86_64-default-linuxapp-icc
View File

@ -108,6 +108,7 @@ CONFIG_RTE_LOG_HISTORY=256
CONFIG_RTE_LIBEAL_USE_HPET=y
CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID=n
CONFIG_RTE_EAL_ALWAYS_PANIC_ON_ERROR=n
CONFIG_RTE_EAL_UNBIND_PORTS=n
#
# Compile Environment Abstraction Layer for linux

7
lib/librte_eal/common/eal_common_pci.c
View File

@ -34,10 +34,12 @@
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/queue.h>
#include <rte_interrupts.h>
#include <rte_log.h>
#include <rte_pci.h>
#include <rte_per_lcore.h>
#include <rte_memory.h>
@ -100,7 +102,10 @@ rte_eal_pci_probe(void)
TAILQ_FOREACH(dev, &device_list, next)
pci_probe_all_drivers(dev);
#ifdef RTE_EAL_UNBIND_PORTS
if (atexit(rte_eal_pci_exit) != 0)
RTE_LOG(ERR, EAL, "atexit failure\n");
#endif
return 0;
}

7
lib/librte_eal/common/include/rte_pci.h
View File

@ -45,6 +45,7 @@
extern "C" {
#endif
#include <limits.h>
#include <sys/queue.h>
#include <stdint.h>
#include <inttypes.h>
@ -110,6 +111,7 @@ struct rte_pci_device {
struct rte_pci_id id; /**< PCI ID. */
struct rte_pci_resource mem_resource; /**< PCI Memory Resource */
struct rte_intr_handle intr_handle; /**< Interrupt handle */
char previous_dr[PATH_MAX]; /**< path for pre-dpdk driver*/
const struct rte_pci_driver *driver; /**< Associated driver */
unsigned int blacklisted:1; /**< Device is blacklisted */
};
@ -154,6 +156,11 @@ struct rte_pci_driver {
/**< Device needs igb_uio kernel module */
#define RTE_PCI_DRV_NEED_IGB_UIO 0x0001
/**
* Perform clean up of pci drivers on application exits.
* */
void rte_eal_pci_exit(void);
/**
* Probe the PCI bus for registered drivers.
*

236
lib/librte_eal/linuxapp/eal/eal_pci.c
View File

@ -66,7 +66,6 @@
#include <rte_string_fns.h>
#include <rte_debug.h>
#include "eal_internal_cfg.h"
#include "eal_filesystem.h"
#include "eal_private.h"
@ -87,8 +86,7 @@
#define IGB_UIO_NAME "igb_uio"
#define UIO_NEWID "/sys/bus/pci/drivers/%s/new_id"
#define UIO_BIND "/sys/bus/pci/drivers/%s/bind"
#define UIO_DRV_PATH "/sys/bus/pci/drivers/%s"
/* maximum time to wait that /dev/uioX appears */
#define UIO_DEV_WAIT_TIMEOUT 3 /* seconds */
@ -127,7 +125,8 @@ pci_uio_check_module(const char *module_name)
f = fopen(PROC_MODULES, "r");
if (f == NULL) {
RTE_LOG(ERR, EAL, "Cannot open "PROC_MODULES"\n");
RTE_LOG(ERR, EAL, "Cannot open "PROC_MODULES": %s\n",
strerror(errno));
return -1;
}
@ -144,11 +143,51 @@ pci_uio_check_module(const char *module_name)
}
}
fclose(f);
RTE_LOG(ERR, EAL, "Cannot find %s in "PROC_MODULES"\n", module_name);
return -1;
}
/* bind a PCI to the kernel module driver */
static int
pci_bind_device(struct rte_pci_device *dev, char dr_path[])
{
FILE *f;
int n;
char buf[BUFSIZ];
char dev_bind[PATH_MAX];
struct rte_pci_addr *loc = &dev->addr;
RTE_LOG(DEBUG, EAL, "bind PCI device "PCI_PRI_FMT"\n",
loc->domain, loc->bus, loc->devid, loc->function);
n = rte_snprintf(dev_bind, sizeof(dev_bind), "%s/bind", dr_path);
if ((n < 0) || (n >= (int)sizeof(buf))) {
RTE_LOG(ERR, EAL, "Cannot rte_snprintf device bind path\n");
return -1;
}
f = fopen(dev_bind, "w");
if (f == NULL) {
RTE_LOG(ERR, EAL, "Cannot open %s\n", dev->previous_dr);
return -1;
}
n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
loc->domain, loc->bus, loc->devid, loc->function);
if ((n < 0) || (n >= (int)sizeof(buf))) {
RTE_LOG(ERR, EAL, "Cannot rte_snprintf PCI infos\n");
fclose(f);
return -1;
}
if (fwrite(buf, n, 1, f) == 0) {
fclose(f);
return -1;
}
RTE_LOG(DEBUG, EAL, "Device bound\n");
fclose(f);
return 0;
}
static int
pci_uio_bind_device(struct rte_pci_device *dev, const char *module_name)
{
@ -157,17 +196,14 @@ pci_uio_bind_device(struct rte_pci_device *dev, const char *module_name)
char buf[BUFSIZ];
char uio_newid[PATH_MAX];
char uio_bind[PATH_MAX];
struct rte_pci_addr *loc = &dev->addr;
RTE_LOG(DEBUG, EAL, "bind PCI device "PCI_PRI_FMT" to %s driver\n",
loc->domain, loc->bus, loc->devid, loc->function, module_name);
n = rte_snprintf(uio_newid, sizeof(uio_newid), UIO_NEWID, module_name);
n = rte_snprintf(uio_newid, sizeof(uio_newid), UIO_DRV_PATH "/new_id", module_name);
if ((n < 0) || (n >= (int)sizeof(uio_newid))) {
RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_newid name\n");
return -1;
}
n = rte_snprintf(uio_bind, sizeof(uio_bind), UIO_BIND, module_name);
n = rte_snprintf(uio_bind, sizeof(uio_bind), UIO_DRV_PATH, module_name);
if ((n < 0) || (n >= (int)sizeof(uio_bind))) {
RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_bind name\n");
return -1;
@ -191,29 +227,11 @@ pci_uio_bind_device(struct rte_pci_device *dev, const char *module_name)
}
fclose(f);
f = fopen(uio_bind, "w");
if (f == NULL) {
RTE_LOG(ERR, EAL, "Cannot open %s\n", uio_bind);
return -1;
}
n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
loc->domain, loc->bus, loc->devid, loc->function);
if ((n < 0) || (n >= (int)sizeof(buf))) {
RTE_LOG(ERR, EAL, "Cannot rte_snprintf PCI infos\n");
fclose(f);
return -1;
}
if (fwrite(buf, n, 1, f) == 0) {
fclose(f);
return -1;
}
RTE_LOG(DEBUG, EAL, "Device bound\n");
fclose(f);
pci_bind_device(dev, uio_bind);
return 0;
}
/* map a particular resource from a file */
static void *
pci_map_resource(struct rte_pci_device *dev, void *requested_addr, const char *devname,
@ -391,7 +409,7 @@ pci_uio_map_resource(struct rte_pci_device *dev)
/* save the mapping details for secondary processes*/
uio_res = rte_malloc("UIO_RES", sizeof(*uio_res), 0);
if (uio_res == NULL){
if (uio_res == NULL) {
RTE_LOG(ERR, EAL, "%s(): cannot store uio mmap details\n", __func__);
return -1;
}
@ -467,6 +485,20 @@ pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
}
/* Compare two PCI device addresses. */
static int
pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2)
{
uint64_t dev_addr = (addr->domain << 24) + (addr->bus << 16) + (addr->devid << 8) + addr->function;
uint64_t dev_addr2 = (addr2->domain << 24) + (addr2->bus << 16) + (addr2->devid << 8) + addr2->function;
if (dev_addr > dev_addr2)
return 1;
else
return 0;
}
/* Scan one pci sysfs entry, and fill the devices list from it. */
static int
pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
@ -529,9 +561,24 @@ pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
return -1;
}
/* device is valid, add in list */
TAILQ_INSERT_TAIL(&device_list, dev, next);
/* device is valid, add in list (sorted) */
if (TAILQ_EMPTY(&device_list)) {
TAILQ_INSERT_TAIL(&device_list, dev, next);
}
else {
struct rte_pci_device *dev2 = NULL;
TAILQ_FOREACH(dev2, &device_list, next) {
if (pci_addr_comparison(&dev->addr, &dev2->addr))
continue;
else {
TAILQ_INSERT_BEFORE(dev2, dev, next);
return 0;
}
}
TAILQ_INSERT_TAIL(&device_list, dev, next);
}
return 0;
}
@ -650,8 +697,11 @@ pci_unbind_kernel_driver(struct rte_pci_device *dev)
RTE_LOG(ERR, EAL, "%s(): rte_snprintf failed\n", __func__);
goto error;
}
if (fwrite(buf, n, 1, f) == 0)
if (fwrite(buf, n, 1, f) == 0) {
RTE_LOG(ERR, EAL, "%s(): could not write to %s\n", __func__,
filename);
goto error;
}
fclose(f);
return 0;
@ -661,6 +711,63 @@ pci_unbind_kernel_driver(struct rte_pci_device *dev)
return -1;
}
static int
pci_exit_process(struct rte_pci_device *dev)
{
if (munmap(dev->mem_resource.addr, dev->mem_resource.len) == -1){
RTE_LOG(ERR, EAL, "Error with munmap\n");
return -1;
}
if (close(dev->intr_handle.fd) == -1){
RTE_LOG(ERR, EAL, "Error closing interrupt handle\n");
return -1;
}
if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
if (pci_unbind_kernel_driver(dev) < 0){
RTE_LOG(ERR, EAL, "Error unbinding\n");
return -1;
}
if (pci_bind_device(dev, dev->previous_dr) < 0){
RTE_LOG(ERR, EAL, "Error binding\n");
return -1;
}
}
return 0;
}
static void
pci_get_previous_driver_path(struct rte_pci_device *dev)
{
int n;
char dev_path[PATH_MAX];
char dr_path[PATH_MAX];
struct rte_pci_addr *loc = &dev->addr;
n = rte_snprintf(dev_path, sizeof(dev_path), SYSFS_PCI_DEVICES "/"
PCI_PRI_FMT "/driver", loc->domain, loc->bus, loc->devid, loc->function );
if ((n < 0) || (n >= (int)sizeof(dev_path)))
RTE_LOG(ERR, EAL, "Cannot rte_snprintf device filepath\n");
n = readlink(dev_path, dr_path, sizeof(dr_path));
if ((n < 0) || (n >= (int)sizeof(dr_path))){
RTE_LOG(ERR, EAL, "Cannot readlink driver filepath\n");
dev->previous_dr[0] = '\0';
return;
}
dr_path[n] = '\0';
if (dr_path[0] != '/')
n = rte_snprintf(dev->previous_dr, sizeof(dev->previous_dr),
SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/%s",
loc->domain, loc->bus, loc->devid, loc->function, dr_path);
else
n = rte_snprintf(dev->previous_dr, sizeof(dev->previous_dr),
"%s", dr_path);
if ((n < 0) || (n >= (int)sizeof(dev_path)))
RTE_LOG(ERR, EAL, "Cannot rte_snprintf driver filepath\n");
}
/*
* If vendor/device ID match, call the devinit() function of the
* driver.
@ -675,37 +782,44 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
if (dr->drv_flags & RTE_PCI_DRV_NEED_IGB_UIO)
module_name = IGB_UIO_NAME;
uio_status = pci_uio_check_module(module_name);
for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
/* check if device's identifiers match the driver's ones */
if (id_table->vendor_id != dev->id.vendor_id &&
id_table->vendor_id != PCI_ANY_ID)
id_table->vendor_id != PCI_ANY_ID)
continue;
if (id_table->device_id != dev->id.device_id &&
id_table->device_id != PCI_ANY_ID)
id_table->device_id != PCI_ANY_ID)
continue;
if (id_table->subsystem_vendor_id != dev->id.subsystem_vendor_id &&
id_table->subsystem_vendor_id != PCI_ANY_ID)
id_table->subsystem_vendor_id != PCI_ANY_ID)
continue;
if (id_table->subsystem_device_id != dev->id.subsystem_device_id &&
id_table->subsystem_device_id != PCI_ANY_ID)
id_table->subsystem_device_id != PCI_ANY_ID)
continue;
RTE_LOG(DEBUG, EAL, "probe driver: %x:%x %s\n",
dev->id.vendor_id, dev->id.device_id, dr->name);
RTE_LOG(DEBUG, EAL, "probe driver: %x:%x %s\n", dev->id.vendor_id,
dev->id.device_id, dr->name);
if ((!dev->blacklisted) && (uio_status != 0)) {
rte_exit(1, "The %s module is required by the %s driver\n",
module_name, dr->name);
}
/* reference driver structure */
dev->driver = dr;
/* no initialization when blacklisted, return without error */
if (dev->blacklisted)
return 0;
/* Unbind PCI devices if needed */
if ((!dev->blacklisted) &&
(module_name != NULL)) {
if (module_name != NULL) {
if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
/* unbind current driver, bind ours */
/* check that our driver is loaded */
if (uio_status != 0 &&
(uio_status = pci_uio_check_module(module_name)) != 0)
rte_exit(EXIT_FAILURE, "The %s module is required by the "
"%s driver\n", module_name, dr->name);
/* unbind current driver, bind ours */
pci_get_previous_driver_path(dev);
if (pci_unbind_kernel_driver(dev) < 0)
return -1;
if (pci_uio_bind_device(dev, module_name) < 0)
@ -716,20 +830,26 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
return -1;
}
/* reference driver structure */
dev->driver = dr;
/* no initialization when blacklisted */
if (dev->blacklisted)
return -1;
/* call the driver devinit() function */
return dr->devinit(dr, dev);
}
return -1;
}
/*Start the exit process for each dev in use*/
void
rte_eal_pci_exit(void)
{
struct rte_pci_device *dev = NULL;
TAILQ_FOREACH(dev, &device_list, next){
if (dev->previous_dr[0] == '\0')
continue;
if(pci_exit_process(dev) == 1)
RTE_LOG(ERR, EAL, "Exit process failure\n");
}
}
/* Init the PCI EAL subsystem */
int
rte_eal_pci_init(void)

479
tools/pci_unbind.py Executable file
View File

@ -0,0 +1,479 @@
#! /usr/bin/python
#
# BSD LICENSE
#
# Copyright(c) 2010-2012 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 vendor:device pairs (again stored as dictionary) supported by igb_uio
module_dev_ids = []
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 the needed modules (igb_uio) is loaded, and then
determine from the .ko file, what its supported device ids are'''
global module_dev_ids
fd = file("/proc/modules")
loaded_mods = fd.readlines()
fd.close()
mod = "igb_uio"
# first check if module is loaded
found = False
for line in loaded_mods:
if line.startswith(mod):
found = True
break
if not found:
print "Error - module %s not loaded" %mod
sys.exit(1)
# now find the .ko and get list of supported vendor/dev-ids
modpath = find_module(mod)
if modpath is None:
print "Cannot find module file %s" % (mod + ".ko")
sys.exit(1)
depmod_output = check_output(["depmod", "-n", modpath]).splitlines()
for line in depmod_output:
if not line.startswith(mod):
continue
if line.endswith(mod+".ko:"):
continue
lineparts = line.split()
module_dev_ids.append({"Vendor": int(lineparts[1],0),
"Device": int(lineparts[2],0)})
def is_supported_device(dev_id):
'''return true if device is supported by igb_uio, false otherwise'''
for dev in module_dev_ids:
if (dev["Vendor"] == devices[dev_id]["Vendor"] and
dev["Device"] == devices[dev_id]["Device"]):
return True
return False
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_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
# 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():
extra_info = check_output(["lspci", "-vmmks", d]).splitlines()
# parse lspci details
for line in extra_info:
if len(line) == 0:
continue
name, value = line.split("\t", 1)
name = name.strip(":") + "_str"
devices[d][name] = value
# check for a unix interface name
sys_path = "/sys/bus/pci/devices/%s/net/" % d
if exists(sys_path):
devices[d]["Interface"] = ",".join(os.listdir(sys_path))
else:
devices[d]["Interface"] = ""
# check if a port is used for ssh connection
devices[d]["Ssh_if"] = False
devices[d]["Active"] = ""
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 is_supported_device(d):
if "Module_str" in devices[d]:
if "igb_uio" not in devices[d]["Module_str"]:
devices[d]["Module_str"] = devices[d]["Module_str"] + ",igb_uio"
else:
devices[d]["Module_str"] = "igb_uio"
if "Module_str" not in devices[d]:
devices[d]["Module_str"] = "<none>"
# 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
# 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:
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"""
dev_list = map(dev_id_from_dev_name, dev_list)
for d in dev_list:
bind_one(d, driver, 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'''
kernel_drv = []
uio_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"] == "igb_uio":
uio_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 IGB_UIO driver", uio_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'''
b_flag = None
status_flag = False
force_flag = False
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
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'''
check_modules()
get_nic_details()
parse_args()
if __name__ == "__main__":
main()