Via Technologies, Inc.

Other

Wei-Pin Chen

Chun-Cheng Wang

Yun-Fei Chao

Ming-Chao Chung

Hung-Chi Huang

Ying-Chung Chen

Chuan-Wei Liu

Jen-Kai Chen

Jiann-Hwa Liou

Chun-Hua Tseng

Hsiao-Lung Wu

Patrick Lin

Yeong-Chian Hu

Chung-Ping Chang

Edward Ku

The disclosure provides a system and method for an external processor to access internal register. The internal register may be a register of a core networking device. The method includes: sending, by an external processor, a read request to a core networking device; responding, by the core networking device, to the read request; sending, by the external processor, a write request to the core networking device; and preparing, by the core networking device, a register status notification of a register embedded in the core networking device and sends the register status notification to the external processor in response to the write request. The read and write requests and the responses are in a layer 2 protocol (L2 protocol).

System and method for an external processor to access internal registers

The disclosure provides a method for transmitting a physical layer operation administration and maintenance (PLOAM) message over an Ethernet network. The method includes the steps of: transmitting, from a first terminal, the PLOAM message to a second terminal over a PLOAM channel connecting the first and second terminals; extracting, by the second terminal, the PLOAM message; sending, from the second terminal, the extracted PLOAM message to an external CPU over an Ethernet protocol; and processing, by the external CPU, the received PLOAM message to generate a processed PLOAM message.

Method for transmitting physical layer operation administration and maintenance message over ethernet and system thereof

A method for MAC address management is provided. A MAC address is provided, and capacities of a first column and a second column corresponding to a first index in a MAC table are checked. If the first column and the second column are filled, capacities of a third column and a fourth column corresponding to a second index in the MAC table are checked. If one of the third and fourth columns is empty, the MAC address is written thereto. The second index is successive to the first index. The MAC table further comprises a plurality of time stamp columns, recording idle time of each MAC address.

MAC address management method

Systems and methods for packet forward control. The system comprises a plurality of ports and a processing module configured to receive a packet. The processing module comprises a resource management module and a forward control module. The resource management module detects whether congestion occurs on at least one specific port among the ports. The forward control module determines whether the specific port comprises a predetermined port within the ports, and if so, forwards the packet to at least one of the ports excepting the predetermined port.

Systems and methods for packet forward control

A message transmitting queue delivers messages between a source controller and a destination controller. According to the message transmitting request of the source controller, sequentially distribute the free message row of the message transmitting queue, and set the message row to the distributed state. After the source controller writes the message of the message row, set the message row to the written state. At this moment, when the message row is in the position that is read sequentially by the destination controller, a read request is issued, so that the destination controller reads the message according to the read request when the reading completes, clears the distributed signal and the written signal, so that the message row goes back to the free state. When the message transmitting queue has no free message row, a no free message row signal to inform the source controller is issued.

Message transmitting queue and associated method

A method for expanding a service VLAN space of a provider network is provided. A bit number occupied by a taq protocol identifier (TPID) in a TPID field is reduced to leave a plurality of spare bits. The spare bits of the TPID field is then used to represent a first portion of a service VLAN identifier. A VLAN identifier field of a tag control information (TCI) field is used to represent a second portion of the service VLAN identifier. The first and second portions are then combined to obtain the service VLAN identifier of the packets completely.

Method for expanding the service VLAN space of a provider network

A data-packet processing method is used in a network system. The network system includes a buffer for optionally storing a data packet to be transferred, and the method includes steps of: determining a type of the data packet to be transferred; determining a storage state of a buffer where the data packet is to be temporarily stored before transferring; and storing the data packet into the buffer if the storage state of the buffer is a packet-accepting storage state; wherein the packet-accepting storage state of the buffer varies with the type of the data packet.

Data-packet processing method in network system

A method for processing packets of a VLAN in a network switch is provided. The VLAN comprises a plurality of physical LANs and are divided into a plurality of subnets. The method comprises the steps of: receiving a packet through an ingress port of the network switch, wherein the packet is tagged with a VID of the VLAN; finding a VLAN member according to the VID, wherein the VLAN member represents all ports of the network switch dedicated to serving packets of the VLAN; finding a forwarding scope according to the ingress port, wherein the ingress port is one of the ports dedicated to serving packets of a first subnet of the VLAN and the forwarding scope represents all ports of the network switch dedicated to serving packets of the first subnet; and determining an egress port of the packet according to both the VLAN member and the forwarding scope.

Method for processing packets of a VLAN in a network switch

The invention provides a method for implementing varying service quality grades in a network switch. First, a plurality of users of the network switch is classified into a plurality of service quality grades according to a contributing factor of the plurality of the users. Each of the plurality of users is then connected to the network switch via one of a plurality of ports of the network switch according to its service quality grade. An original priority of a packet in the network switch is then determined. An adjusted priority of the packet is then determined according to both the original priority of the packet and a priority adjustment table of an ingress port of the packet. Each of the plurality of ports has a corresponding priority adjustment table, and each of the priority adjustment tables includes a mapping relationship between the original priority and the adjusted priority.

Method for implementing varying grades of service quality in a network switch

The present invention relates to a structure and a method of data update in a cache memory inside a local processor, which uses the feature of cache control. A buffer block of a header buffer is mapped to a memory space at several different address sectors addressed by the local processor. Whenever the local processor attempts to access the internal cache memory, cache missing will occur so that a local processor will be forced to alternatively request new data from buffer blocks of a header buffer in a HCA. Consequently, the whole block is loaded into cache memory. This does not only boost cache update performance but also accelerates packet access.

Structure and method of cache memory data update

A symmetric dual-slot data hash method and a switching apparatus using the same having a first block and a second block of equal size for storing MAC addresses. The size of the dual-slot address table is p&#xd7;2m with m is an integer, and p is 2 or a prime. The hash address comprises a higher address portion and a lower address portion. A CRC hash operation is performed to the MAC address by using the m-bit CRC function to obtain a hash value. Next, the highest bit of the hash value is removed and the remained bits are used as the lower address portion of the hash address. A dividend is set according to the m-th bit of the MAC address. After the dividend is divided by a divisor p to obtain a remainder, the remainder is set as a higher address portion of the hash address.

Symmetric dual-slot data hash method and network switching apparatus using same

A relay control circuit that uses a hashing algorithm for increasing the hit rate in a table lookup operation. Destination medium access control (DMAC) address is extracted from a network frame. The DMAC address is scrambled to put the frequently changing bytes in a position closer to each other. The scrambled address is sent to a cyclic redundancy checking circuit, where a cyclic redundancy checking operation with hashing function capability is carried out to produce a remainder. The remainder is sent to a memory unit for a table lookup operation. Hence, the relay control circuit is capable of finding a destination port that corresponds to a given DMAC address in a very short time, thereby boosting network efficiency.

Relay control circuit using hashing function algorithm

A method for performing a MAC address lookup in a network switch of an Ethernet network is provided, using a memory structure including a number of multi-slot buckets. Each of the multi-slot buckets is mapped to a hash key derived from a MAC Address. Each of the multi-slot buckets has a number of forwarding table section, each storing a number of the forwarding table entries. If two forwarding table entries are stored in each forwarding table section of a 4-slot bucket &frac14; memory space and &frac12; access time can be saved. Thus, the lookup for the forwarding table according to the MAC address in the Ethernet switch IC can be effectively performed.

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Taipei, Taiwan

Wei-Pin Chen