Pointer sharing in QDMA transactions
A Queue Direct Memory Access (QDMA) system includes circuitry configured to store N pointers in a contiguous block of memory in the QDMA system, wherein N is an integer greater than 1 and there are N queues in the QDMA system with each pointer of the N pointers being associated with a queue of the N queues, receive a pointer packet from a host device connected to a chip device that includes the QDMA system, wherein the pointer packet includes all of the N pointers, and perform a write of contents of the pointer packet over the contiguous block of memory, such that the N pointers are written in one update.
1. A Queue Direct Memory Access (QDMA) system comprising circuitry configured to:
store N pointers in a contiguous block of memory in the QDMA system, wherein N is an integer greater than 1 and there are N queues in the QDMA system with each pointer of the N pointers being associated with a queue of the N queues,
receive a pointer packet from a host device connected to a chip device that includes the QDMA system, wherein the pointer packet includes all of the N pointers, and
perform a write of contents of the pointer packet over the contiguous block of memory, such that the N pointers are written in one update,
wherein the N pointers are write pointers from the host, and wherein the circuitry is further configured to store N read pointers in a second contiguous block of memory in the QDMA system.
2. The QDMA system of claim 1 , wherein the pointer packet is a Transaction Layer Packet (TLP) from Peripheral Component Interconnect Express (PCle).
3. The QDMA system of claim 1 , wherein the pointer packet is received via a Peripheral Component Interconnect Express (PCle) link.
4. The QDMA system of claim 1 , wherein the chip device is a Field Programmable Gate Array (FPGA) and the host device is a processor, and wherein the QDMA system is disposed in the FPGA.
5. The QDMA system of claim 1 , wherein the chip device is a first Field Programmable Gate Array (FPGA) and the host device is a second FPGA.
6. The QDMA system of claim 5 , wherein the second FPGA includes a second QDMA system.
7. The QDMA system of claim 1 , wherein the circuitry is further configured to
access the N pointers in the contiguous block of memory and perform memory transfer from a memory associated with the chip in the N queues to addresses in memory associated with the host, where the addresses are in the N pointers.
8. A Queue Direct Memory Access (QDMA) system comprising circuitry configured to:
store N pointers in a contiguous block of memory in the QDMA system, wherein N is an integer greater than 1 and there are N queues in the QDMA system with each pointer of the N pointers being associated with a queue of the N queues,
receive a pointer packet from a host device connected to a chip device that includes the QDMA system, wherein the pointer packet includes all of the N pointers, and
perform a write of contents of the pointer packet over the contiguous block of memory, such that the N pointers are written in one update,
wherein the pointer packet is received via a Peripheral Component Interconnect Express (PCle) link and is after one or more of (1) the PCle link being idle and (2) a predetermined update period of time.
9. The QDMA system of claim 8 , wherein the pointer packet is a Transaction Layer Packet (TLP) from Peripheral Component Interconnect Express (PCle).
10. The QDMA system of claim 8 , wherein the pointer packet is received via a Peripheral Component Interconnect Express (PCle) link.
11. The QDMA system of claim 8 , wherein the chip device is a Field Programmable Gate Array (FPGA) and the host device is a processor, and wherein the QDMA system is disposed in the FPGA.
12. The QDMA system of claim 8 , wherein the chip device is a first Field Programmable Gate Array (FPGA) and the host device is a second FPGA.
13. The QDMA system of claim 12 , wherein the second FPGA includes a second QDMA system.
14. The QDMA system of claim 8 , wherein the circuitry is further configured to
access the N pointers in the contiguous block of memory and perform memory transfer from a memory associated with the chip in the N queues to addresses in memory associated with the host, where the addresses are in the N pointers.
15. A Queue Direct Memory Access (QDMA) system comprising circuitry configured to:
store N pointers in a contiguous block of memory in the QDMA system, wherein N is an integer greater than 1 and there are N queues in the QDMA system with each pointer of the N pointers being associated with a queue of the N queues,
receive a pointer packet from a host device connected to a chip device that includes the QDMA system, wherein the pointer packet includes all of the N pointers, and
perform a write of contents of the pointer packet over the contiguous block of memory, such that the N pointers are written in one update, wherein the QDMA system is utilized to queue memory transfers from the chip device to the host device, and wherein memory transfers from the host device to the chip device are performed without queuing.
16. The QDMA system of claim 15 , wherein the pointer packet is a Transaction Layer Packet (TLP) from Peripheral Component Interconnect Express (PCle).
17. The QDMA system of claim 15 , wherein the pointer packet is received via a Peripheral Component Interconnect Express (PCle) link.
18. The QDMA system of claim 15 , wherein the chip device is a Field Programmable Gate Array (FPGA) and the host device is a processor, and wherein the QDMA system is disposed in the FPGA.
19. The QDMA system of claim 15 , wherein the chip device is a first Field Programmable Gate Array (FPGA) and the host device is a second FPGA.
20. The QDMA system of claim 15 , wherein the circuitry is further configured to
access the N pointers in the contiguous block of memory and perform memory transfer from a memory associated with the chip in the N queues to addresses in memory associated with the host, where the addresses are in the N pointers.