igb(7D) Devices igb(7D)NAMEigb - Intel 82575 1Gb PCI Express NIC Driver
SYNOPSIS
/dev/igb*
DESCRIPTION
The igb Gigabit Ethernet driver is a multi-threaded, loadable, clon‐
able, GLD-based STREAMS driver supporting the Data Link Provider Inter‐
face, dlpi(7P), on Intel 82575 Gigabit Ethernet controllers.
The igb driver functions include controller initialization, frame
transmit and receive, promiscuous and multicast support, and error
recovery and reporting.
The igb driver and hardware support auto-negotiation, a protocol speci‐
fied 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
available throughput, while requiring no manual configuration. The igb
driver also allows you to configure the advertised capabilities 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 INTERFACE
The cloning character-special device, /dev/igb, is used to access all
Intel 82575 Gigabit devices installed within the system.
The igb driver is managed by the dladm(1M) command line utility,
which allows VLANs to be defined on top of igb instances and for igb
instances to be aggregated. See dladm(1M) for more details.
You must send an explicit DL_ATTACH_REQ message to associate the opened
stream with a particular device (PPA). The PPA ID is interpreted as an
unsigned integer data type and indicates the corresponding device
instance (unit) number. The driver returns an error (DL_ERROR_ACK) if
the PPA field value does not correspond to a valid device instance num‐
ber for the system. The device is initialized on first attach and de-
initialized (stopped) at last detach.
The values returned by the driver in the DL_INFO_ACK primitive in
response to your DL_INFO_REQ are:
o Maximum SDU is 9000.
o Minimum SDU is 0.
o DLSAP address length is 8.
o MAC type is DL_ETHER.
o SAP (Service Access Point) 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 broadcast
address (FF:FF:FF:FF:FF:FF).
Once in the DL_ATTACHED state, you must send a DL_BIND_REQ
to associate a particular SAP with the stream.
CONFIGURATION
By default, the igb driver performs auto-negotiation to select the
link speed and mode. Link speed and mode can be any one of the follow‐
ing, (as described in the IEEE803.2 standard):
1000 Mbps, full-duplex.
100 Mbps, full-duplex.
100 Mbps, half-duplex.
10 Mbps, full-duplex.
10 Mbps, half-duplex.
The auto-negotiation protocol automatically selects speed (1000 Mbps,
100 Mbps, or 10 Mbps) and operation mode (full-duplex or half-duplex)
as the highest common denominator supported by both link partners.
Alternatively, you can set the capabilities advertised by the igb
device using ndd(1M). The driver supports a number of parameters whose
names begin with adv_ (see below). Each of these parameters contains a
boolean value that determines if the device advertises that mode of
operation. For example, the adv_1000fdx_cap parameter indicates if
1000M full duplex is advertised to link partner. The adv_autoneg cap
parameter controls whether auto-negotiation is performed. If
adv_autoneg_cap is set to 0, the driver forces the mode of operation
selected by the first non-zero parameter in priority order as shown
below:
(highest priority/greatest throughput)
adv_1000fdx_cap 1000Mbps full duplex
adv_100fdx_cap 100Mpbs full duplex
adv_100hdx_cap 100Mbps half duplex
adv_10fdx_cap 10Mpbs full duplex
adv_10hdx_cap 10Mpbs half duplex
(lowest priority/least throughput)
All capabilities default to enabled. Note that changing any capability
parameter causes the link to go down while the link partners renegoti‐
ate the link speed/duplex using the newly changed capabilities.
FILES
/dev/igb* Special character device.
/kernel/drv/igb 32-bit device driver (x86).
/kernel/drv/amd64/igb 64-bit device driver (x86).
/kernel/drv/sparcv9/igb 64-bit device driver (SPARC).
/kernel/drv/igb.conf Configuration file.
SEE ALSOdladm(1M), ndd(1M), netstat(1M), driver.conf(4), attributes(5),
streamio(7I), dlpi(7P),
Writing Device Drivers
STREAMS Programming Guide
Network Interfaces Programmer's Guide
SunOS 5.11 20 Jul 2007 igb(7D)