igb(7D) Devices igb(7D)NAMEigb - Intel 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 82575/82576 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 part‐
ners 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 part‐
ner's advertised capabilities.
The igb driver also supports the SRIOV capability on Intel 82576 Giga‐
bit Ethernet controller. In SRIOV enabled mode, it supports the Physi‐
cal Function of the controller.
CONFIGURATION
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.
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 IEEE 803.2 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)
en_1000fdx_cap 1000Mbps full duplex
en_100fdx_cap 100Mpbs full duplex
en_100hdx_cap 100Mbps half duplex
en_10fdx_cap 10Mpbs full duplex
en_10hdx_cap 10Mpbs half duplex
(lowest priority/least throughput)
All capabilities default to enabled. Changing any capability parameter
causes the link to go down while the link partners renegotiate the link
speed/duplex using the newly changed capabilities.
In SRIOV mode, the following device specific parameters are exported by
the igb driver to supprot SR-IOV feature.
max-config-vfs This is a read-only parameter describing the maximum
number of VFs that can be configured. A value of 7 is
exported to override the information that is found in
PCI config space of the 82576 device. This difference
is due to the fact that igb driver utilizes hardware
resources to provide a functional PF device along
with VFs. This parameter enables external management
software to limit the number of configured VFs to be
7 or less.
max-vlans This is a read-only parameter describing the maximum
number of VLAN filters supported for PF and VFs. As
the 82576 supports 32 VLAN filters for PF and VFs all
together, a value of 32 is exported. This parameter
allows external management software entities to limit
the number of VLAN filters configured to be with the
supported limit.
max-vf-mtu This is a read-only parameter describing the maximum
MTU allowed for a VF. A value of 9216 is exported to
indicate the 82576 VF hardware limit. This parameter
allows external management software to limit the max‐
imum VF MTU setting to be within the described limit.
pvid-exclusive This is a read-only parameter describing the hardware
attribute that vlan IDs and port vlan ID are mutual
exclusive on a 82576 device. Users cannot set vlan
IDs successfully when port vlan ID has been set.
Vice versa, users cannot set port vlan ID success‐
fully when vlan IDs have been set.
unicast-slots This is a tunable parameter that allows the reserva‐
tion of unicast mac-address slots to a PF or a VF. A
total of 24 unicast mac-address slots are present in
a 82576 device instance, out which one mac-address
slot for the PF and each VFs is always reserved. The
rest of the unicast mac-address slots can be reserved
for the PF or VFs through this parameter. If not, the
rest unicast mac-address slots are shared and allo‐
cated on first come first serve basis.
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),
dlpi(7P), igbvf(7D), streamio(7I)
Writing Device Drivers
STREAMS Programming Guide
Network Interfaces Programmer's Guide
SunOS 5.10 28 Jul 2011 igb(7D)
