Flow Control Parameters; Table 4-3 Read-Write Flow Control Keyword Descriptions - Sun Microsystems GigaSwift Ethernet Adapter Installation And User Manual

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:
NOTICE: Last setting will leave ce0 with no link capabilities.
WARNING: ce0: Restoring previous setting.

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
TABLE 4-3
Keyword
adv_asmpause_cap
adv_pause_cap
40 Sun GigaSwift Ethernet Adapter Installation and User's Guide • August 2004
provides flow control keywords and describes their function.
Read-Write Flow Control Keyword Descriptions
Description
The adapter supports asymmetric pause, which means it
can pause only in one direction.
0=Off (default)
1=On
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.