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
|
.TH lldptool 8 "February 2010" "open-lldp" "Linux"
.SH NAME
ETS-{CFG|REC} \- Show / manipulate ETS TLV configuration
.SH SYNOPSIS
.B lldptool -t -i ethx -V ETS-CFG
.RI <-c " " CONFIG_ARG " " ...>
.sp
.warn 2095099
.ti 4
.IR CONFIG_ARG " := { "
.BR enableTx " | " willing " | " tsa " | " up2tc " | " numtcs " | " tcbw " }"
.sp
.B lldptool -T -i ethx -V ETS-CFG
.RI CONFIG_ARG=value " " ...
.sp
.ti 4
.IR CONFIG_ARG " :=
.sp
.BR enableTx " = " {yes|no} " | "
.sp
.BR willing " = " {yes|no} " | "
.sp
.BR tsa " = " tc:{ets|strict|vendor},... " | "
.sp
.BR up2tc " = " priority:tc,... " | "
.sp
.BR tcbw " = " bw1,bw2,...
.sp
.B lldptool -t -i ethx -V ETS-REC
.RI <-c " " CONFIG_ARG " " ...>
.sp
.B lldptool -T -i ethx -V ETS-REC
.RI CONFIG_ARG=value " " ...
.sp
.ti 4
.IR CONFIG_ARG " :=
.sp
.BR enableTx " = " {yes|no} " | "
.sp
.BR tsa " = " tc:{ets|strict|vendor},... " | "
.sp
.BR up2tc " = " priority:tc,... " | "
.sp
.BR tcbw " = " bw1,bw2,...
.sp
.SH DESCRIPTION
The Enhanced Transmission Selection (ETS) feature has a recommendation
TLV and a configuration TLV configured with ETS-REC and ETS-CFG respectively.
.SH ARGUMENTS
.TP
.B enableTx
Enables the ETS TLV to be transmitted
.TP
.B willing
Sets the ETS-CFG willing bit
.TP
.B tsa
Transmission selection algorithm, sets a comma separated list \
of traffic classes to the corresponding selection algorithm. Valid algorithms \
include "ets", "strict" and "vendor".
.sp
.TP
.B up2tc
Comma separated list mapping user priorities to traffic classes.
.sp
.TP
.B tcbw
Comma separated list of bandwidths for each traffic class the first value
being assigned to traffic class 0 and the second to traffic class 1 and so
on. Undefined bandwidths are presumed to be 0.
.sp
.TP
.B numtcs
Displays the number of ETS supported traffic classes.
.SH Theory of Operations
IEEE 802.1Qaz is enabled by default on hardware that supports this mode
indicated by support for the DCBNL interface. Kernel config option
CONFIG_DCB. The ETS-CFG TLV is advertised by default with the attributes
indicated by querying the hardware for its current configuration. A
valid configuration is to map all priorities to a single traffic class
and use the link strict selection algorithm. This is equivalent to
being in a non-DCB enabled mode.
To support legacy DCBX (CIN or CEE) the ETS-CFG and ETS-REC TLVs are disabled
if a legacy DCBX TLV is received and no valid IEEE DCBX TLVs
are received. The hardware DCBX mode will also be set to the legacy
mode and IEEE mode is disabled. This allows switches to be configured and
end nodes will then be configured accordingly without any configuration
required on the end node. See \fIlldpad(8)\fR for more information
about the operation of the DCBX selection mechanism.
Mapping applications and protocols to traffic classes is required for
ETS to be useful. User space programs can encode the priority of an
application with the SO_PRIORITY option. The net_prio cgroup can be
used to assign application traffic to specific priorities. See the
kernel documentation and \fIcgdcbxd(8)\fR for net_prio cgroup information.
.B
.SH EXAMPLE & USAGE
.TP
Configure willing bit for interface \fIeth2\fR
.B lldptool -T -i eth2 -V ETS-CFG willing=yes
.TP
Configure traffic classes for ETS and strict priority on \fIeth2\fR
.B lldptool -T -i eth2 -V ETS-CFG tsa=0:ets,1:ets,2:ets,3:ets,4:strict,5:strict
.TP
Configure 1:1 mapping from priority to traffic classes on \fIeth2\fR
.B lldptool -T -i eth2 -V ETS-CFG up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7
.TP
Display local configured ETS-CFG parameters for tcbw
.B lldptool -t -i eth2 -V ETS-CFG -c tcbw
.TP
Display last transmitted ETS-CFG TLV
.B lldptool -t -i eth2 -V ETS-CFG
.TP
Configure ETS-CFG and ETS-REC for default DCB on \fIeth2\fR
.B lldptool -T -i eth2 -V ETS-CFG tsa=0:ets,1:ets,2:ets,3:ets,4:ets,5:ets,6:ets,7:ets up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7 tcbw=12,12,12,12,13,13,13,13
.B lldptool -T -i eth2 -V ETS-REC tsa=0:ets,1:ets,2:ets,3:ets,4:ets,5:ets,6:ets,7:ets up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7 tcbw=12,12,12,12,13,13,13,13
.SH SOURCE
.TP
o
IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)
.SH NOTES
Support for tc-mqprio was added in 2.6.38 on older kernels other mechanisms may need to be used to map applications to traffic classes.
.SH SEE ALSO
.BR lldptool (8),
.BR lldptool-app (8),
.BR lldpad (8),
.BR tc-mqprio (8),
.SH AUTHOR
John Fastabend
|
