blob: 8be98b25479e8037577e91959ad23c956da763ca (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
#!/bin/bash
#
# **** License ****
# Version: VPL 1.0
#
# The contents of this file are subject to the Vyatta Public License
# Version 1.0 ("License"); you may not use this file except in
# compliance with the License. You may obtain a copy of the License at
# http://www.vyatta.com/vpl
#
# Software distributed under the License is distributed on an "AS IS"
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
# the License for the specific language governing rights and limitations
# under the License.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2008 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Robert E. Gilligan
# Date: 2008
# Description:
#
# **** End License ****
#
# CLI back-end script to manipulate NIC interrupt CPU affinity.
#
# Provides sub-commands to:
# - Check the validity of an interface name and affinity mask value
# - Set the affinity mask to the IRQ being used by an interface
# - Reset the affinity mask of the IRQ being used by an interface to the
# system default value of all-ones.
# - Print the affinity mask of the IRQ being used by an interface
#
# Max number of hex characters in an IRQ affinity mask. Support up to 16 CPUs.
MAX_MASK=4
# Set up some global values...
numcpus=`grep -c -e "^processor" /proc/cpuinfo`
declare -i maxmask=(2**numcpus)
let maxmask=maxmask-1
maxmaskhex=`printf "%x" ${maxmask}`
print_usage()
{
echo "Usage:"
echo -e "\t$0 check <ifname> <mask>"
echo -e "\t$0 set <ifname> <mask>"
echo -e "\t$0 reset <ifname>"
echo -e "\t$0 print <ifname>"
}
get_irqnum()
{
irqnum=`cat /sys/class/net/$1/device/irq`
if [ -z "$irqnum" ]; then
echo "Invalid interface name: $1"
return 1
fi
return 0
}
get_mask()
{
mask=$1
# mask must be a short hex value
if [ ${#mask} -gt $MAX_MASK ]; then
echo "mask too long: ${#2} characters."
return 1
fi
# strip out all the hex digits
exmask=`echo $mask | sed -e s/[0-9a-fA-F]//g`
# if anything is left, its not hex
if [ ! -z "$exmask" ]; then
echo "Invalid characters in hex mask: $exmask"
return 1
fi
declare -i intmask=0x${mask}
# Make sure that mask holds at least one bit, and holds no more bits
# than we have CPUs.
if [ ${intmask} -eq 0 ]; then
echo "Mask can not be 0."
return 1
fi
if [ $intmask -gt $maxmask ]; then
echo "Mask is too large. Maximum hexidecimal bitmask is: ${maxmaskhex}"
return 1
fi
return 0
}
#
# Don't waste our time with uniprocessor machines
#
check_uniproc()
{
if [ $maxmask -eq 1 ]; then
echo "This machine has only 1 CPU."
echo "Can only set SMP affinity on multi-processor machines"
return 1;
fi
return 0
}
case "$1" in
check)
if [ $# -ne 3 ]; then
print_usage
exit 1
fi
if ! check_uniproc ; then
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
if ! get_mask $3 ; then
exit 1
fi
exit 0
;;
set)
if [ $# -ne 3 ]; then
print_usage
exit 1
fi
if ! check_uniproc ; then
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
if ! get_mask $3 ; then
exit 1
fi
echo $mask > /proc/irq/$irqnum/smp_affinity
if [ $? -ne 0 ]; then
echo "Couldn't assign smp_affinity. Exit status: $?"
exit 1
fi
;;
reset)
if [ $# -ne 2 ]; then
print_usage
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
echo $maxmaskhex > /proc/irq/$irqnum/smp_affinity
if [ $? -ne 0 ]; then
echo "Couldn't assign smp_affinity. Exit status: $?"
exit 1
fi
;;
print)
if [ $# -ne 2 ]; then
print_usage
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
mask=`cat /proc/irq/$irqnum/smp_affinity`
if [ -z $mask ]; then
echo "Couldn't get smp_affinity for interface $2, irq $irqnum"
exit 1
fi
echo "Interface $2 is using IRQ: $irqnum"
echo "SMP affinity mask for IRQ $irqnum is: $mask"
;;
*)
print_usage
exit 1
;;
esac
|
