ieee802.3(5) Standards, Environments, and Macros ieee802.3(5)
NAME
ieee802.3, cap_autoneg, cap_1000fdx, cap_1000hdx, cap_100fdx, cap_100hdx, cap_10fdx, cap_10hdx, cap_rem_fault, cap_pause, cap_asmpause,
adv_cap_autoneg, adv_cap_1000fdx, adv_cap_1000hdx, adv_cap_100fdx, adv_cap_100hdx, adv_cap_10fdx, adv_cap_10hdx, adv_cap_pause,
adv_cap_asmpause, adv_rem_fault, lp_cap_autoneg, lp_cap_1000fdx, lp_cap_1000hdx, lp_cap_100fdx, lp_cap_100hdx, lp_cap_10fdx, lp_cap_10hdx,
lp_cap_pause, lp_cap_asmpause, lp_rem_fault, xcvr_addr, xcvr_id, xcvr_inuse, link_up, link_duplex, link_pause, link_asmpause - Ethernet mii
kstat and ndd parameters
DESCRIPTION
This page describes the kernel statistics and the ndd(1M) configuration parameters used to monitor and configure the Ethernet physical
layer.
The cap_* parameters exist in the kernel statistics for an Ethernet device. The parameters describe the maximum capability of a device.
When the value of a statistic is 1, the device has the capability described. When the value is 0, the device does not have the capability.
The exceptions to this rule are the cap_asmpause and cap_pause parameters which are explained later in the page.
cap_autoneg Capable of auto-negotiation
cap_1000fdx Capable of 1000 full duplex operation
cap_1000hdx Capable of 1000 half duplex operation
cap_100fdx Capable of 100 full duplex operation
cap_100hdx Capable of 100 half duplex operation
cap_10fdx Capable of 10 full duplex operation
cap_10hdx Capable of 10 half duplex operation
cap_rem_fault Capable of reporting locally detected faults to link partner
The adv_cap_* parameters exist in the kernel statistics and represent a mirror image of the ndd adv_*_cap parameter list for an Ethernet
device. The ndd adv_*_cap tuning parameters allow fine grain control of the Ethernet device physical layer. The parameters are also a sub-
set of the cap_* statistics. If the cap_* value is 0, the corresponding adv_cap_* must also be 0. The exceptions to this rule are the
adv_cap_asmpause and adv_cap_pause parameters.
When auto-negotiation is enabled, the adv_*_cap statistics show which capabilities are advertised to the link partner. When auto-negotia-
tion is disabled in forced mode, the statistics precisely show how a link should function and that it must be matched on the link partner
to achieve a valid link up.
Statistics with values other than 0 and 1 are also described in the following.
adv_cap_autoneg Advertise auto-negotiation capability
adv_cap_1000fdx Advertise 1000 full duplex capability
adv_cap_1000hdx Advertise 1000 half duplex capability
adv_cap_100fdx Advertise 100 full duplex capability
adv_cap_100hdx Advertise 100 half duplex capability
adv_cap_10fdx Advertise 10 full duplex capability
adv_cap_10hdxv Advertise 10 half duplex capability
adv_rem_fault Fault value reported by the local system to the peer
0 Link is good
1 Off line
2 Link failure
3 Auto-negotiation failure
The lp_cap_* parameters exist as kernel statistics for an Ethernet device. The statistics are the advertised capabilities provided by the
link partner on completion of auto-negotiation. If the capabilities match the capabilities provided in the local advertisement, the link
can proceed to a link up state. If no match is found, the link remains down. In two other instances, lp_cap_* values might all be zero:
when a cable is not present, when forced mode is enabled.
lp_cap_autoneg Link partner advertises auto-negotiation capability
lp_cap_1000fdx Link partner advertises 1000 full duplex capability
lp_cap_1000hdx Link partner advertises 1000 half duplex capability
lp_cap_100fdx Link partner advertises 100 full duplex capability
lp_cap_100hdx Link partner advertises 100 half duplex capability
lp_cap_10fdx Link partner advertises 10 full duplex capability
lp_cap_10hdx Link partner advertises 10 half duplex capability
lp_rem_fault Fault value the remote system reports
0 Link is good
1 Off line
2 Link failure
3 Auto-negotiation failure
The xcvr_* kernel statistics provide information about the physical layer device that is in use.
xcvr_addr MII address in the 0 to 31 range of the physical layer device in use for a given Ethernet device
xcvr_id MII transceiver manufacturer and device ID
xcvr_inuse MII transceiver type, based on the following list:
0 other Undefined
1 none MII present, but nothing connected
2 10Mb/s 10Mb/s Manchester encoding
3 100BaseT4 100 Mb/s 8B/6T
4 100BaseX 100 Mb/s 4B/5B
5 100BaseT2 100 Mb/s PAM5X5
6 1000BaseX 1000 Mb/s 8B/10B
7 1000BaseT 1000 Mb/s 4D-PAM5
The above values define maximum capability. In many cases, lower speeds can occur. The cap_* statistics must be
viewed to establish the range of capability.
The link_* kernel statistics show the link state at the local end of the connection.
link_up 1 Link is up
0 Link is down
link_duplex 2 Full duplex link
1 Half duplex link
0 Unknown
The cap_asmpause, cap_pause, adv_cap_asmpause, and adv_cap_pause parameters do not follow the rules of other cap_* and adv_cap_* kstats or
parameters.
cap_pause The meaning of this statistic depends on the value provided by cap_asmpause.
if cap_asmpause = 1, pause one direction
1 Send pause frames when there is receive congestion.
0 Pause transmission when a pause frame is received.
if cap_asmpause = 0, pause in either direction
1 Send pause frames when there is receive congestion, and pause transmission when a pause frame is received.
0 Pause capability is not available in either direction.
cap_asmpause Asymmetric pause capability
The adv_cap_pause and adv_cap_asmpause statistics are limited by the available settings for cap_pause and cap_asmpause. For a device that
is fully capable of pausing both Rx (receive) and Tx (transmit) operations, the settings available are defined in the truth table that fol-
lows the adv_cap_pause and adv_cap_asmpause parameter descriptions below.
adv_cap_pause The meaning of this statistic depends on the value provided by adv_cap_asmpause.
if adv_cap_asmpause = 1
1 Send pause frames when there is receive congestion.
0 Pause transmission when a pause frame is received.
if adv_cap_asmpause = 0
1 Send pause frames when there is receive congestion, and pause transmission when a pause frame is received.
0 Pause capability is not available in either direction.
adv_cap_asmpause Asymmetric pause capability
The cap_asmpause and cap_pause statistics show the capability of a device and also limit the legal setting for adv_cap_asmpause and
adv_cap_pause. The following truth table describes the available adv_cap_asmpause and adv_cap_pause settings limited by cap_asmpause and
cap_pause statistics. The abbreviations below are used in the table.
CA cap_asmpause
CP cap_pause
AA adv_cap_asmpause
AP adv_cap_pause
CP CA AP AA Description
0 0 0 0 No pause in use
0 0 x x Device not pause capable, cannot
set
0 1 0 0 Asymmetric Rx pause capable, but
not advertised
0 1 0 1 Asymmetric Rx pause capable and
advertised
0 1 1 0 Asymmetric Rx pause capable, making
it impossible advertise symmetric
pause
0 1 1 1 Asymmetric Rx pause capable, making
it impossible advertise asymmetric
Tx pause
1 0 0 0 Symmetric pause capable, but not
advertised
1 0 0 1 Symmetric pause capable, advertis-
ing asymmetric Rx pause only
1 0 1 0 Symmetric pause capable, advertis-
ing symmetric Rx and Tx pause capa-
bility
1 0 1 1 Symmetric pause capable, advertis-
ing asymmetric Tx pause only
1 1 0 0 Asymmetric Tx pause capable, but
not advertised
1 1 0 1 Asymmetric Tx pause capable, making
it impossible to advertise Asymmet-
ric Rx pause
1 1 1 0 Asymmetric Tx pause capable, making
it impossible advertise symmetric
pause
1 1 1 1 Asymmetric Tx pause capable and
advertised
In the cases above, an error is posted when a device driver cannot advertise. A new setting is ignored and values revert to the previous
setting.
The lp_cap_pause and the lp_cap_asmpause provide the advertised capabilities of the link partners.
lp_cap_pause The meaning of this statistic depends on the value provided by lp_cap_asmpause.
if lp_cap_asmpause = 1
1 Send pause frames when there is receive congestion.
0 Pause transmission when a pause frame is received.
if lp_cap_asmpause = 0
1 Send pause frames when there is receive congestion, and pause transmission when a pause frame is received.
0 Pause capability is not available in either direction.
lp_cap_asmpause Asymmetric pause capability
When adv_*pause_cap and lp_*pause_cap are compared on completion of auto-negotiation, the chosen flow control mechanism for the link
depends on what is most meaningful.
link_asmpause 1 indicates flow control in one direction.
0 indicates flow control in both directions when link_pause is set to one.
link_pause if link_asmpause = 0
1 Flow control in both Rx and Tx directions is available.
0 No flow control available on the link.
if link_asmpause = 1
1 The local station will honor received pause frames by temporarily suspending transmit of further frames.
0 In the event of receive congestion, the local station will transmit a pause frame to the peer.
lp_cap_asmpause Asymmetric pause capability
The following truth table illustrates the meaningful flow control combinations related to local and link partner configurations. The
abbreviations below are used in the table.
AA adv_cap_asmpause
AP adv_cap_pause
LAC lp_cap_asmpause
LPC lp_cap_pause
LA link_asmpause
LP link_pause
AA AP LAC LPC LA LP Description
1 0 1 1 1 0 Local station will Tx a pause
when Rx is congested.
0 1 0 1 0 1 Flow control in both Rx and Tx
directions.
x 1 1 0 1 1 Local station will honor received
Pause frames by temporarily sus-
pending Transmit.
x x x x 0 0 All other combinations: Flow con-
trol not avilable on the link
When forced mode is enabled, the current setting of adv_cap_asmpause and adv_cap_pause are used for the link. The link_asmpause and
link_pause become equal to the current adv_cap_asmpause and adv_cap_pause settings. The above table also applies in forced mode, but the
link partner configuration must be checked to verify that flow control is operating on the link.
SEE ALSO
ndd(1M), driver.conf(4), bge(7D), ce(7D), dlpi(7P), eri(7D), ge(7D), gld(7D), hme(7D), qfe(7D)
NOTES
When adv_cap_autoneg is set to 0, the highest priority speed and duplex is used for forced mode.
The highest priority is the highest speed at full duplex. The lowest priority is the lowest speed at half duplex.
MII transceivers can exist internally to a system or can be connected to an external MII connector. Typically, an internal transceiver has
an xcvr_addr of 1, while an external connection has an xcvr_addr of 0.
SunOS 5.10 13 Sep 2004 ieee802.3(5)