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Priority Queue Setup for QoS | |
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QuarterDeck Device has 4 Priority Queues to support QoS. The priority of | |
a frame is determined by (in priority order): | |
1) The CPU's Trailer if enabled on the port. | |
2) The DA address in the frame if the frame's DA address is in the address | |
database with a priority defined. | |
3) The IEEE 802.3ac Tag containing IEEE 802.1p priority information | |
if enabled on the port. | |
4) The IPv4 Type of Service (TOS)/DiffServ field or IPv6 Traffic Class | |
field if enabled on the port. | |
5) The Port's default priority defined in DefPri. | |
This sample program will deal with the above 3) ~ 5) cases. | |
qos.c | |
sampleQoS will enable using both IEEE 802.3ac Tag and IPv4/IPv6 Traffic | |
Class field and IEEE 802.3ac has a higher priority than IPv4/IPv6. | |
The following is the QoS mapping programmed by sampleQos: | |
1) IEEE 802.3ac Tag (Priority 0 ~ 7, 3 bits) | |
Priority 1~3 is using QuarterDeck Queue 0. | |
Priority 0,4 is using QuarterDeck Queue 1. | |
Priority 6,7 is using QuarterDeck Queue 2. | |
Priority 5 is using QuarterDeck Queue 3. | |
2) IPv4/IPv6 (Priority 0 ~ 63, 6 bits) | |
Priority 0~7 is using QuaterDeck Queue 0. | |
Priority 8~31 is using QuaterDeck Queue 1. | |
Priority 32~55 is using QuaterDeck Queue 2. | |
Priority 56~63 is using QuaterDeck Queue 3. | |
3) Each port's default priority is set to 1. | |