qe(4)
Name
qe − DEQNA/DELQA Ethernet interface
Syntax
device qe0 at uba0 csr 0174440 vector qeintr
Description
The qe interface provides access to a 10 Mb/s Ethernet network through a DEQNA/DELQA controller.
The host’s Internet address is specified at boot time with an SIOCSIFADDR ioctl. The qe interface employs the address resolution protocol described in arp() to dynamically map between Internet and Ethernet addresses on the local network.
The interface normally tries to use a “trailer” encapsulation to minimize copying data on input and output. This can be disabled for an interface by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl. Trailers are only used for packets destined for Internet hosts.
The SIOCSPHYSADDR ioctl can be used to change and SIOCRPHYSADDR can be used to read the physical address of the board. SIOCADDMULTI and SIOCDELMULTI can be used to add or delete multicast addresses. The board recognizes at most 10 multicast addresses. The argument to the latter ioctls is a pointer to an ifreq structure found in <net/if.h>.
SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or “read and clear” the board counters. The argument to the latter two ioctls is a pointer to a counter structure "ctrreq" found in <net/if.h>.
The ioctls SIOCENABLBACK and SIOCDISABLBACK can be used to enable and disable the interface loopback mode.
Restrictions
The PUP protocol family is not supported.
Diagnostics
Various error messages can occur while transmitting or receiving packets. For example,
qe%d: can’t handle af%d
The interface was handed a message with addresses formatted in an unsuitable address family; the packet was dropped.