Sun Microsystems Gigabit Ethernet MMF/UTP Adapter manual Flow Control Parameters

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 ipge0 with no link capabilities.

WARNING: ipge0: Restoring previous setting.

Flow Control Parameters

The ipge device sources (transmits) and terminates (receives) pause frames conforming to the IEEE 802.3x Frame Based Link Level Flow Control Protocol. In response to received flow control frames, the ipge device can slow down its transmit rate. The ipge device sources 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 3-6provides flow control keywords and describes their function.

TABLE 3-6Read-Write Flow Control Keyword Descriptions

KeywordDescription

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.

Gigabit Link Clock Mastership Controls

Link clock mastership was introduced with gigabit twisted-pair technology. One side of the link is the master that provides the link clock and the other side is the slave that uses the link clock. Once this relationship is established, the link is up, and

Chapter 3 Configuring ipge and e1000 Driver Parameters 37