- Sun Installation and User's Guide GigaSwift Ethernet Adapter

40 Sun GigaSwift Ethernet Adapter Installation and User’s Guide • August 2004
Note – If a parameter’s initial setting is 0, it cannot be changed. If you try to change
the setting, it will revert back to 0.
If all these parameters are set to 1, autonegotiation uses the highest speed possible. If
all these parameters are set to 0, you receive the following error message:
Flow Control Parameters
The ce device is capable of sourcing (transmitting) and terminating (receiving)
pause frames conforming to the IEEE 802.3x Frame Based Link Level Flow Control
Protocol. In response to received flow control frames, the ce device can slow down
its transmit rate. The ce device is capable of sourcing flow control frames by
requesting the link partner to slow down, provided that the link partner supports
this feature. By default, the driver advertises both transmit and receive pause
capability during autonegotiation.
TABLE 4-3 provides flow control keywords and describes their function.
NOTICE: Last setting will leave ce0 with no link capabilities.
WARNING: ce0: Restoring previous setting.
TABLE 4-3 Read-Write Flow Control Keyword Descriptions
Keyword Description
adv_asmpause_cap The adapter supports asymmetric pause, which means it
can pause only in one direction.
0=Off (default)
1=On
adv_pause_cap This parameter has two meanings, each depending on the
value of adv_asmpause_cap. (Default=0)
• If adv_asmpause_cap = 1 while adv_pause_cap =1,
pauses are received.
• If adv_asmpause_cap = 1 while adv_pause_cap =0,
pauses are transmitted.
• If adv_asmpause_cap = 0 while adv_pause_cap =1,
pauses are sent and received.
• If adv_asmpause_cap = 0, then adv_pause_cap
determines whether Pause capability is on or off.