equivalent ethtool for solaris

if you are looking for equivalent ethtool for solaris, the answer is ndd
ndd - get and set driver configuration parameters

to get your network interface card (eg: hme0) info:

# ndd -get /dev/hme link_status
# ndd -get /dev/hme link_speed
# ndd -get /dev/hme link_mode

link_status
0 for Link Down
1 for Link up

link_speed
0 for 10 Mbps
1 for 100 Mbps

link_mode
0 for Half-Duplex mode
1 for Full-Duplex mode

and of course for more info:

# man ndd