# US 11,115,474 B2 · Data transmission and network interface controller > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,474 B2 - Document ID: US11115474B2 - Status: Granted - Kind: B2 - Application number: 17/164,678 - Filed: 2021-02-01 - Published: 2021-05-27 - Granted: 2021-09-07 - Earliest claimed: 2019-07-11 - Assignees: Advanced New Technologies Co., Ltd. - Applicants: Advanced New Technologies Co., Ltd. - Inventors: Changqing Li; Yinchao Zou; Peng Wu; Jincan Kong - Web page: https://patentgrep.com/patent/US11115474B2 ## CPC - H04L 69/329: in the application layer [OSI layer 7] - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 49/901: using storage descriptor, e.g. read or write pointers - H04L 49/9094: {Arrangements for simultaneous transmit and receive, e.g. simultaneous reading/writing from/to the storage element} - H04L 67/1091: {Interfacing with client-server systems or between P2P systems} - H04L 69/12: Protocol engines - G06F 15/17331: {Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]} - H04L 67/1097: for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Implementations of this disclosure provide data transmission operations and network interface controllers. An example method performed by a first RDMA network interface controller includes obtaining m data packets from a host memory of a first host; sending the m data packets to a second RDMA network interface controller of a second host; backing up the m data packets to a network interface controller memory integrated into the first RDMA network interface controller; determining that the second RDMA network interface controller does not receive n data packets of the m data packets; and in response, obtaining the n data packets from the m data packets that have been backed up to the network interface controller memory integrated into the first RDMA network interface controller, and retransmitting the n data packets to the second RDMA network interface controller. ## Claims ### Claim 1 A computer-implemented method, comprising: obtaining, by a first RDMA network interface controller of a first host, m data packets; sending, by the first RDMA network interface controller, the m data packets to a second RDMA network interface controller of a second host; backing up, by the first RDMA network interface controller, the m data packets; determining, by the first RDMA network interface controller, that the second RDMA network interface controller does not receive n data packets of the m data packets; and in response to determining that the second RDMA network interface controller does not receive n data packets of the m data packets (i) obtaining, by the first RDMA network interface controller, the n data packets from the m data packets that have been backed up by the first RDMA network interface controller, and (ii) retransmitting, by the first RDMA network interface controller, the n data packets that have been obtained by the first RDMA network interface controller from the m data packets that have been backed up by the first RDMA network interface controller, to the second RDMA network interface controller. ### Claim 2 (depends on 1) The computer-implemented method of claim 1, wherein obtaining the m data packets comprises obtaining, by the first RDMA network interface controller of the first host, m data packets from a host memory of the first host, using a peripheral component interconnect express to access data on the host memory. ### Claim 3 (depends on 2) The computer-implemented method of claim 2, wherein the m data packets have been stored in the host memory of the first host by a top-layer application, wherein obtaining the m data packets is performed in response to receiving, by the first RDMA network interface controller, instructions describing the m data packets to be sent. ### Claim 4 (depends on 1) The computer-implemented method of claim 1, wherein backing up the m data packets comprises backing up, by the first RDMA network interface controller, the m data packets to a network interface controller memory integrated into the first RDMA network interface controller. ### Claim 5 (depends on 4) The computer-implemented method of claim 4, wherein the network interface controller memory integrated into the first RDMA network interface controller is a dynamic random access memory. ### Claim 6 (depends on 4) The computer-implemented method of claim 4, further comprising: in response to determining, by the first RDMA network interface controller, that the second RDMA network interface controller has received the m data packets, including the n data packets that have been retransmitted by the first RDMA network interface controller, deleting the m data packets from the network interface controller memory. ### Claim 7 (depends on 1) The computer-implemented method of claim 1, wherein determining that the second RDMA network interface controller does not receive n data packets of the m data packets comprises determining that an acknowledgement (ACK) response for the n data packets has not been received from the second RDMA network interface controller within a predetermined duration. ### Claim 8 (depends on 7) The computer-implemented method of claim 7, wherein determining that the acknowledgement (ACK) response for the n data packets has not been received from the second RDMA network interface controller within the predetermined duration comprises, for each data packet of the m data packets, starting a corresponding timer for the data packet after sending the data packet. ### Claim 9 (depends on 1) The computer-implemented method of claim 1, wherein determining that the second RDMA network interface controller does not receive n data packets of the m data packets comprises determining that a negative acknowledgement (NACK) response for the n data packets has been received from the second RDMA network interface controller. ### Claim 10 A computer-implemented system, comprising: one or more computers; and one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising: obtaining, by a first RDMA network interface controller of a first host, m data packets; sending, by the first RDMA network interface controller, the m data packets to a second RDMA network interface controller of a second host; backing up, by the first RDMA network interface controller, the m data packets; determining, by the first RDMA network interface controller, that the second RDMA network interface controller does not receive n data packets of the m data packets; and in response to determining that the second RDMA network interface controller does not receive n data packets of the m data packets (i) obtaining, by the first RDMA network interface controller, the n data packets from the m data packets that have been backed up by the first RDMA network interface controller, and (ii) retransmitting, by the first RDMA network interface controller, the n data packets that have been obtained by the first RDMA network interface controller from the m data packets that have been backed up by the first RDMA network interface controller, to the second RDMA network interface controller. ### Claim 11 (depends on 10) The computer-implemented system of claim 10, wherein obtaining the m data packets comprises obtaining, by the first RDMA network interface controller of the first host, m data packets from a host memory of the first host, using a peripheral component interconnect express to access data on the host memory. ### Claim 12 (depends on 11) The computer-implemented system of claim 11, wherein them data packets have been stored in the host memory of the first host by a top-layer application, wherein obtaining the m data packets is performed in response to receiving, by the first RDMA network interface controller, instructions describing the m data packets to be sent. ### Claim 13 (depends on 10) The computer-implemented system of claim 10, wherein backing up the m data packets comprises backing up, by the first RDMA network interface controller, the m data packets to a network interface controller memory integrated into the first RDMA network interface controller. ### Claim 14 (depends on 13) The computer-implemented system of claim 13, wherein the network interface controller memory integrated into the first RDMA network interface controller is a dynamic random access memory. ### Claim 15 (depends on 13) The computer-implemented system of claim 13, the operations further comprising: in response to determining, by the first RDMA network interface controller, that the second RDMA network interface controller has received the m data packets, including the n data packets that have been retransmitted by the first RDMA network interface controller, deleting the m data packets from the network interface controller memory. ### Claim 16 (depends on 10) The computer-implemented system of claim 10, wherein determining that the second RDMA network interface controller does not receive n data packets of the m data packets comprises determining that an acknowledgement (ACK) response for the n data packets has not been received from the second RDMA network interface controller within a predetermined duration. ### Claim 17 (depends on 16) The computer-implemented system of claim 16, wherein determining that the acknowledgement (ACK) response for the n data packets has not been received from the second RDMA network interface controller within the predetermined duration comprises, for each data packet of the m data packets, starting a corresponding timer for the data packet after sending the data packet. ### Claim 18 (depends on 10) The computer-implemented system of claim 10, wherein determining that the second RDMA network interface controller does not receive n data packets of the m data packets comprises determining that a negative acknowledgement (NACK) response for the n data packets has been received from the second RDMA network interface controller. ### Claim 19 A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising: obtaining, by a first RDMA network interface controller of a first host, m data packets; sending, by the first RDMA network interface controller, the m data packets to a second RDMA network interface controller of a second host; backing up, by the first RDMA network interface controller, the m data packets; determining, by the first RDMA network interface controller, that the second RDMA network interface controller does not receive n data packets of the m data packets; and in response to determining that the second RDMA network interface controller does not receive n data packets of the m data packets (i) obtaining, by the first RDMA network interface controller, the n data packets from the m data packets that have been backed up by the first RDMA network interface controller, and (ii) retransmitting, by the first RDMA network interface controller, the n data packets that have been obtained by the first RDMA network interface controller from the m data packets that have been backed up by the first RDMA network interface controller, to the second RDMA network interface controller.