End-to-end negative acknowledgment
AssigneeHewlett Packard Enterprise Development LP
InventorDerek A. Sherlock
Life of this patent
Estimating the term…
Abstract
A processing device includes a transceiver to be coupled to a link and control logic coupled to the transceiver. The control logic is to assign a unique sequence identifier to each packet to be transmitted across the link to a receiving node and transmit packets via the transceiver across the link to the receiving node. Each packet is to have a unique sequence identifier. The control logic also is to receive a message from the receiving node, the message containing the sequence identifier of a packet not correctly received by the receiving node. Based on the received message, the control logic is to cause an end-to-end negative acknowledgment (E2E NAK) packet to be transmitted to an originating node of the packet that was not correctly received.
Claims14
A processing device, comprising:
- a transceiver to be coupled to a link;
- control logic accessible to the transceiver, the control logic to:
- assign a unique sequence identifier to each packet to be transmitted across the link to a receiving node;
- transmit packets via the transceiver across the link to the receiving node, each packet to have a unique sequence identifier;
- receive a link level negative acknowledgement (NAK) message from the receiving node, the message containing the sequence identifier of a packet not correctly received by the receiving node;
- and
- based on the received message, cause an end-to-end negative acknowledgment (E2E NAK) packet to be transmitted to an originating node of the packet not correctly received;
- and
- storage for the sequence identifiers but not for the packets transmitted across the link.
A transceiver, comprising:
- a receiver to couple to a link;
- a transmitter to couple to the link;
- a sequence identifier append unit to assign a unique sequence identifier to each packet to be transmitted across the link by the transmitter;
- storage for the sequence identifiers but not for the packets transmitted across the link;
- an end-to-end negative acknowledgment (E2E NAK) generator coupled to the receiver and to generate an E2E NAK packet based on a link level negative acknowledgement (NAK) message received over the link by the receiver and containing the sequence identifier of a packet determined to have an error;
- and
- a packet tracker storage to include information usable to identify an originating node of each packet transmitted by the transmitter and unique packet information to identify each such packet;
- wherein, the E2E NAK generator is to access the packet tracker storage to determine an identify of the originating node of a packet indicated by the message as not correctly received and to generate and transmit an end-to-end negative acknowledgment (E2E NAK) packet to the originating node and not retry the packet on the link on the link.
A method, comprising:
- assigning a sequence identifier to a packet, wherein the packet originated from an originating node;
- transmitting the packet across a link from a transmitting node to a receiving node;
- storing the sequence identifier but not for the packet transmitted across the link;
- detecting an error in the packet at the receiving node;
- receiving a link level negative acknowledgement (NAK) message from the receiving node indicating an error having occurred with the packet and the sequence identifier of the packet experiencing the error;
- and
- transmitting, by the transmitting node, an end-to-end negative acknowledgment (E2E NAK) packet to the originating node to cause the originating node to retransmit the packet.
Dependencies are inferred from the claim text.