IGB(7D) Devices IGB(7D)


igb - Intel 82575 1Gb PCI Express NIC Driver




The igb Gigabit Ethernet driver is a multi-threaded, loadable,
clonable, GLD-based STREAMS driver supporting the Data Link Provider
Interface, 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
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 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.


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 number
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

Once in the DL_ATTACHED state, you must send a DL_BIND_REQ to
associate a particular SAP with the stream.


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 following, (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 100Mbps full duplex
adv_100hdx_cap 100Mbps half duplex
adv_10fdx_cap 10Mbps full duplex
adv_10hdx_cap 10Mbps 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 renegotiate
the link speed/duplex using the newly changed capabilities.


Special character device.

32-bit device driver (x86).

64-bit device driver (x86).

64-bit device driver (SPARC).

Configuration file.


dladm(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

July 20, 2007 IGB(7D)