hxge - Sun Blade 10 Gigabit Ethernet network driver




The hxge Gigabit Ethernet driver is a multi-threaded, loadable, clonable,
GLD-based STREAMS driver supporting the Data Link Provider Interface,
dlpi(4P), on the Sun Blade Shared 10Gb Ethernet Interface.

The Shared PCI-Express 10 Gb networking interface provides network I/O
consolidation for up to six Constellation blades, with each blade seeing
its own portion of the network interface.

The hxge driver functions include chip initialization, frame transmit and
receive, flow classification, multicast and promiscuous support and error
recovery and reporting in the blade domain.


The cloning character-special device, /dev/hxge, is used to access Sun
Blade Shared 10Gb Ethernet Interface devices installed within the system.

The hxge driver is managed by the dladm(8) command line utility, which
allows VLANs to be defined on top of hxge instances and for hxge
instances to be aggregated. See dladm(8) 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 a DL_INFO_REQ are:

o Maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>).

o Minimum SDU is 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 broadcast address

Due to the nature of the link address definition for IPoIB,
the DL_SET_PHYS_ADDR_REQ DLPI primitive is not supported.

In the transmit case for streams that have been put in raw
mode via the DLIOCRAW ioctl, the dlpi application must prepend
the 20 byte IPoIB destination address to the data it wants to
transmit over-the-wire. In the receive case, applications
receive the IP/ARP datagram along with the IETF defined 4 byte

Once in the DL_ATTACHED state, you must send a DL_BIND_REQ to associate a
particular Service Access Point (SAP) with the stream.


The link speed and mode are fixed at 10 Gbps full-duplex.

The default MTU is 1500. To enable jumbo frame support, you configure the
hxge driver by defining the accept-jumbo property to 1 in the hxge.conf
file. Note that the largest jumbo size is 9178 bytes.

The driver may be configured to discard certain classes of traffic. By
default, no class of traffic is allowed. You configure the hxge driver by
defining the class option property to 0x20000 in hxge.conf to discard the
specified class of traffic. For example, the following line in hxge.conf
discards all IP Version 4 TCP traffic:

class-opt-ipv4-tcp = 0x20000;

You can also use the ndd(8) command to configure the hxge driver at
runtime to discard any classes of traffic.

The hxge driver supports self-healing functionality, see fmd(8). By
default it is configured to DDI_FM_EREPORT_CAPABLE |
DDI_FM_ERRCB_CAPABLE. You configure the hxge driver by defining the fm-
capable property in hxge.conf to other capabilities or to 0x0 to disable
it entirely.

The hxge driver may be configured using the standard ifconfig(8) command.

The hxge driver also reports various hardware and software statistics
data. You can view these statistics using the kstat(8) command.


Special character device.

64-bit device driver (SPARC).

64-bit device driver (x86).

Configuration file.


See attributes(7) for descriptions of the following attributes:

|Architecture | SPARC, x86 |


streamio(4I), dlpi(4P), driver.conf(5), attributes(7), dladm(8), fmd(8),
ifconfig(8), kstat(8), ndd(8), netstat(8)

Writing Device Drivers

STREAMS Programming Guide

Network Interfaces Programmer's Guide

June 20, 2021 HXGE(4D)