se(4)
NAME
se − DESVA Ethernet interface
SYNTAX
device se0 at uba0 csr 0x200e0000 vector seintr
DESCRIPTION
The se interface provides access to a 10 Mb/s Ethernet network through the DESVA controller. The DESVA controller is used with the busless Small VAX processors.
The host’s Internet address is specified at boot time with an SIOCSIFADDR ioctl. The se interface employs the address resolution protocol described in arp(4p) to map dynamically 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 the physical address of the DESVA. The SIOCRPHYSADDR ioctl can be used to read the physical address of the DESVA.
The SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete multicast addresses. The DESVA recognizes a maximum of 12 multicast addresses.
The SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or "read and clear" the Ethernet driver counters. The argument to these two ioctls is a pointer to a counter structure, ctrreq, found in <net/if.h>.
The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to enable and disable the interface loopback mode respectively.
DIAGNOSTICS
The diagnostic error messages contain relevant information provided by the DESVA. For example:
se: can’t handle af%d
The interface was handed a message with addresses formatted in an unsuitable address family, and the packet was dropped.
se: memory error (MERR)
mser = nnnn
mear = nnnn
A memory parity error has occurred. The memory system error register (mser) and memory error address register (mear) are printed. The mear contains the page number of the physical address of the failing byte when the parity error occurred.
SEE ALSO
Special Files