Receiver packet handling

Patent metadata

Field	Value
Publication number	US-2016378702-A1
Application number	US-201615192723-A
Country	US
Kind code	A1
Filing date	Jun 24, 2016
Priority date	Jun 29, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

Methods and devices for handling short Peripheral Component Interconnect Express (PCIe) Transaction Layer Packets (TLPs) are described. A receiver can receive at least a portion of a first packet and can process the first packet to determine if the first packet is a short packet. The receiver can receive at least a portion of a second packet and if the first packet is a short packet, the receiver can transmit a negative acknowledgement (NAK) in response to the second packet and can receive a retransmission of the second packet.

First claim

What is claimed is:

1 . A method for receiving communications packets by a receiver, the method comprising:
receiving, by receiving circuitry of the receiver, at least a portion of a first packet; processing, by processing circuitry of the receiver, the first packet to determine if the first packet is of a particular packet type; receiving by the receiving circuitry of the receiver, at least a portion of a second packet; and if the first packet is of the particular packet type, transmitting, by transmitting circuitry of the receiver, a negative acknowledgement (NAK) in response to the second packet.

2 . The method of claim 1 , wherein the processing comprises determining whether the first packet passes a data link check, and the NAK is transmitted without further processing of the second packet.

3 . The method of claim 1 , further comprising receiving a retransmission of the second packet in response to the NAK.

4 . The method of claim 1 , wherein the particular packet type comprises a packet having a certain length.

5 . The method of claim 1 , wherein the particular packet type comprises a short packet, wherein a short packet is a packet of four or fewer double-words in length.

6 . The method of claim 1 , wherein the particular packet type comprises a packet which is shorter than a Peripheral Component Interconnect Express (PCIe) Transaction Layer Packet (TLP).

7 . The method of claim 1 , wherein the particular packet type comprises an improperly formed packet.

8 . The method of claim 1 , wherein the particular packet type comprises a packet which does not comply with a PCIe packet format.

9 . A receiver configured to receive communications packets, comprising:
receiving circuitry configured to receive at least a portion of a first packet; processing circuitry configured to process the first packet to determine if the first packet is of a particular packet type; the receiving circuitry further configured to receive at least a portion of a second packet; and transmitting circuitry configured to transmit a negative acknowledgement (NAK) in response to the second packet if the first packet is determined to be of the particular packet type.

10 . The receiver of claim 9 , wherein the transmitting circuitry is configured to transmit the NAK without further processing of the second packet by the processing circuitry.

11 . The receiver of claim 9 , wherein the receiving circuitry is further configured to receive a retransmission of the second packet in response to the NAK.

12 . The receiver of claim 9 , wherein the particular packet type comprises a packet having a certain length.

13 . The receiver of claim 9 , wherein the particular packet type comprises a short packet.

14 . The receiver of claim 9 , wherein the particular packet type comprises a packet which is shorter than a Peripheral Component Interconnect Express (PCIe) Transaction Layer Packet (TLP).

15 . The receiver of claim 9 , wherein the particular packet type comprises a improperly formed packet.

16 . The receiver of claim 9 , wherein the particular packet type comprises a packet which does not comply with a PCIe packet format.

17 . A method for receiving communications packets by a receiver, the method comprising:
receiving, by receiving circuitry of the receiver, at least a portion of a first packet; and if the first packet is received within a threshold time of an earlier received packet, transmitting, by transmitting circuitry of the receiver, a negative acknowledgement (NAK) in response to the first packet.

18 . The method of claim 17 , wherein the NAK is transmitted without further processing of the first packet.

19 . The method of claim 17 , further comprising receiving a retransmission of the first packet in response to the NAK.

20 . The method of claim 17 , wherein the first packet comprises a packet of a certain type.

Assignees

• Ati Technologies Ulc

Inventors

• Caruk Gordon
• Marczewski Jaroslaw

Classifications

• G06F13/4282

  on a serial bus, e.g. I2C bus, SPI bus (on daisy chain buses G06F13/4247) · CPC title

• G06F13/36 Primary

  for access to common bus or bus system · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• G06F2213/0026

  PCI express · CPC title

• H04L47/36

  by determining packet size, e.g. maximum transfer unit [MTU] · CPC title