Devices bge(7D)
NAME
bge - SUNW,bge Gigabit Ethernet driver for Broadcom BCM57xx
SYNOPSIS
/dev/bge*
DESCRIPTION
The bge Gigabit Ethernet driver is a multi-threaded, load-
able, clonable, GLD-based STREAMS driver supporting the Data
Link Provider Interface, dlpi(7P), on Broadcom BCM57xx (BCM5700/5701/5703/5704/5705/5705M/5714/5721/5751/5751M/5782/5788 on x86) Gigabit Ethernet controllers fitted to the systemmotherboard. With the exception of BCM5700/BCM5701/BCM5704S, these devices incorporate both MAC and PHY functions and
provide three-speed (copper) Ethernet operation on the RJ-45
connectors. (BCM5700/BCM5701/BCM5704S do not have a PHY integrated into the MAC chipset.)
The bge driver functions include controller initialization,
frame transmit and receive, promiscuous and multicast sup-
port, and error recovery and reporting.The bge driver and hardware support auto-negotiation, a pro-
tocol specified by the 1000 Base-T standard. Auto-
negotiation allows each device to advertise its capabilities and discover those of its peer (link partner). The highest common denominator supported by both link partners is automatically selected, yielding the greatest availablethroughput, while requiring no manual configuration. The bge
driver also allows you to configure the advertised capabili-
ties to less than the maximum (where the full speed of the interface is not required), or to force a specific mode of operation, irrespective of the link partner's advertised capabilities. APPLICATION PROGRAMMING INTERFACEThe cloning character-special device, /dev/bge, is used to
access all BCM57xx devices ( (BCM5700/5701/5703/5704, 5705/5714/5721/5751/5751M/5782 on x86) fitted to the system motherboard.The bge driver is managed by the dladm(1M) command line
utility, which allows VLANs to be defined on top of bge
instances and for bge instances to be aggregated. See
dladm(1M) for more details.SunOS 5.11 Last change: 9 Apr 2008 1
Devices bge(7D)
You must send an explicit DL_ATTACH_REQ message to associate
the opened stream with a particular device (PPA). The PPA IDis interpreted as an unsigned integer data type and indi-
cates the corresponding device instance (unit) number. Thedriver returns an error (DL_ERROR_ACK) if the PPA field
value does not correspond to a valid device instance number for the system. The device is initialized on first attachand de-initialized (stopped) at last detach.
The values returned by the driver in the DL_INFO_ACK primi-
tive in response to a DL_INFO_REQ are:
o Maximum SDU (default 1500). o Minimum SDU (default 0). o DLSAP address length is 8.o MAC type is DL_ETHER.
o SAP length value is -2, meaning the physical
address component is followed immediately by a 2-
byte SAP component within the DLSAP address.o Broadcast address value is the Ethernet/IEEE broad-
cast address (FF:FF:FF:FF:FF:FF).Once in the DL_ATTACHED state, you must send a DL_BIND_REQ
to associate a particular Service Access Point (SAP) with the stream. CONFIGURATIONBy default, the bge driver performs auto-negotiation to
select the link speed and mode. Link speed and mode can be any one of the following, (as described in the IEEE803.2 standard):o 1000 Mbps, full-duplex
o 1000 Mbps, half-duplex
o 100 Mbps, full-duplex
o 100 Mbps, half-duplex
o 10 Mbps, full-duplex
o 10 Mbps, half-duplex
SunOS 5.11 Last change: 9 Apr 2008 2
Devices bge(7D)
The auto-negotiation protocol automatically selects:
o Speed (1000 Mbps, 100 Mbps, or 10 Mbps)o Operation mode (full-duplex or half-duplex)
as the highest common denominator supported by both linkpartners. Because the bge device supports all modes, the
effect is to select the highest throughput mode supported by the other device. Alternatively, you can set the capabilities advertised bythe bge device using dladm(1M). The driver supports a number
of parameters whose names begin with en_ (see below). Each
of these parameters contains a boolean value that determines whether the device advertises that mode of operation. Ifen_autoneg_cap is set to 0, the driver forces the mode of
operation selected by the first non-zero parameter in prior-
ity order as listed below: (highest priority/greatest throughput)en_1000fdx_cap 1000Mbps full duplex
en_1000hdx_cap 1000Mpbs half duplex
en_100fdx_cap 100Mpbs full duplex
en_100hdx_cap 100Mpbs half duplex
en_10fdx_cap 10Mpbs full duplex
en_10hdx_cap 10Mpbs half duplex
(lowest priority/least throughput)For example, to prevent the device 'bge2' from advertising
gigabit capabilities, enter (as super-user):
# dladm set-linkprop -p enable_1000hdx_cap=0 bge2
# dladm set-linkprop -p enable_1000fdx_cap=0 bge2
All capabilities default to enabled. Note that changing any capability parameter causes the link to go down while the link partners renegotiate the link speed/duplex using the newly changed capabilities. The current settings of the parameters may be found usingdladm show-ether. In addition, the driver exports the
current state, speed, duplex setting, and working mode of the link via kstat parameters (these are read only and may not be changed). For example, to check link state of deviceSunOS 5.11 Last change: 9 Apr 2008 3
Devices bge(7D)
bge0:
# dladm show-ether -x bge0
LINK PTYPE STATE AUTO SPEED-DUPLEX PAUSE
bge0 current up yes 1G-f bi
-- capable -- yes 1G-fh,100M-fh,10M-fh bi
-- adv -- yes 1G-fh bi
-- peeradv -- yes 1G-f bi
The output above indicates that the link is up and runningat 1Gbps full-duplex with its rx/tx direction pause capabil-
ity. To extract link state information for the same link using kstat:# kstat bge:0:mac:link_state
module: bge instance: 0
name: mac class: netlink_state
The default MTU is 1500. To enable Jumbo Frames support, youcan configure the bge driver by defining the default_mtu
property via dladm(1M) or in driver.conf(4) to greater than1500 bytes (for example: default_mtu=9000). Note that the
largest jumbo size supported by bge is 9000 bytes. Addition-
ally, not all bge-derived devices currently support Jumbo
Frames. The following devices support Jumbo Frames up to 9KB: BCM5700, 5701, 5702, 5703C, 5703S, 5704C, 5704S, 5714C, 5714S, 5715C and 5715S. Other devices currently do not support Jumbo Frames. FILES/kernel/drv/bge* 32-bit ELF kernel module. (x86)
/kernel/drv/amd64/bge 64-bit ELF kernel module (x86).
/kernel/drv/sparcv9/bge 64-bit ELF kernel module (SPARC).
ATTRIBUTES
See attributes(5) for a description of the following attri-
butes:SunOS 5.11 Last change: 9 Apr 2008 4
Devices bge(7D)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Architecture | SPARC, x86 ||_____________________________|_____________________________|
SEE ALSO
dladm(1M), driver.conf(4), attributes(5), streamio(7I), dlpi(7P) Writing Device Drivers STREAMS Programming Guide Network Interfaces Programmer's GuideSunOS 5.11 Last change: 9 Apr 2008 5