A network transport layer accelerator accelerates processing of packets so that packets can be forwarded at wire-speed. To accelerate processing of packets, the accelerator performs pre-processing on a network transport layer header encapsulated in a packet for a connection and performs in-line network transport layer checksum insertion prior to transmitting a packet. A timer unit in the accelerator schedules processing of the received packets. The accelerator also includes a free pool allocator which manages buffers for storing the received packets and a packet order unit which synchronizes processing of received packets for a same connection.
1. An accelerator for accelerating packet processing for packets transferred over a network using a connection oriented protocol comprising:
a packet processing unit configured to perform pre-processing on a transport layer network protocol header encapsulated in a received packet for a connection, allocate a work queue entry for the received packet, and store data extracted from the transport layer network protocol header in the work queue entry and tag information defining how the work queue entry is synchronized and ordered;
a packet order unit configured to synchronize and order processing of the work queue entry based on the associated tag information; and
a timer unit configured to schedule processing of the work queue entries by at least one processor.
2. The accelerator of claim 1 , wherein the transport layer network protocol is Transmission Control Protocol.
3. The accelerator of claim 2 , further comprising a fetch and add unit for maintaining statistical information of the Transmission Control Protocol.
4. The accelerator of claim 1 , wherein the transport layer network protocol is User Datagram Protocol.
5. The accelerator of claim 1 , wherein the packet processing unit performs inline network transport layer checksum insertion for the processed packet prior to transmitting the processed packet over the network.
6. The accelerator of claim 1 further including a free pool allocator configured to manage a pool of free buffers for storing the received packets, each pool of free buffers having an assigned priority and a programmable number of buffers available in the free pool allocator.
7. The accelerator of claim 6 , wherein each pool of free buffers is expandable through the use of buffers in a memory accessible by the free pool allocator.
8. The accelerator of claim 1 , wherein the timer unit includes a plurality of queues, each queue assigned for scheduling received packets to be processed by one of a plurality of processors.
9. A method for accelerating processing of packets transferred over a network using a connection oriented network protocol, comprising:
performing pre-processing on a transport layer network protocol header encapsulated in a received packet for a connection;
allocating a work queue entry for the received packet;
storing data extracted from the transport layer network protocol header in the work queue entry for processing the received packet and tag information for defining how the work queue entry is synchronized and ordered;
synchronizing and ordering processing of the work queue entry based on the associated tag information; and
scheduling processing of the work queue entries by at least one processor.
10. The method of claim 9 , wherein the transport layer network protocol is the Transmission Control Protocol.
11. The method of claim 9 , wherein the transport layer network protocol is the User Datagram Protocol.
12. The method of claim 9 further comprising:
performing inline network transport layer checksum insertion for the processed packet prior to transmitting the processed packet over the network.
13. The method of claim 9 further including managing a pool of free buffers for storing the received packets, the pool of free buffers has an assigned priority and a programmable number of buffers in a free pool allocator.
14. The method of claim 13 , wherein the pool of free buffers is expandable through the use of buffers accessible by the free pool allocator.
15. The method of claim 9 , wherein scheduling comprises:
assigning one of a plurality of queues for scheduling received packets to be processed by one of a plurality of processors.
16. An accelerator for accelerating packet processing for packets transferred over a network using a connection oriented protocol, comprising:
means for performing pre-processing on a transport layer network protocol header encapsulated in a received packet for a connection;
means for allocating a work queue entry for the received packet;
mean for storing data extracted from the transport layer network protocol header in the work queue entry for use by the processor for processing the received packet and tag information for defining how the work queue entry is synchronized and ordered;
means for synchronizing and ordering processing of the work queue entry based on the associated tag information; and
means for scheduling processing of the work queue entries by at least one processor.