Transmission control protocol (TCP) data handling

• US 9,854,070 B2
• Filed: 11/13/2015
• Issued: 12/26/2017
• Est. Priority Date: 11/13/2015
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Banerjee, Dwip N., Barrat, Frederic, Filali-Adib, Khalid, Dai, David Z.
• Primary Examiner(s): Salad, Abdullahi E
• Application Number:
  US14/940,292
• Publication Number:
  US 20170142232A1
• Time in Patent Office: 774 Days
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57
• CPC Class Codes: G06F 8/656 while running
• CPC Class Codes: H04L 49/9005 using dynamic buffer space allocation
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416
• CPC Class Codes: H04L 67/62 Establishing a time schedule for servicing the requests
• CPC Class Codes: H04L 69/162 involving adaptations of sockets based mechanisms secure socket layer H04L63/168

Abstract

A method for handling transmission control protocol (TCP) data between networked computer nodes during blackout periods associated with live kernel updating is provided. The method includes initiating a live kernel update on a first node, transmitting, prior to performing a network blocking procedure associated with the live kernel update, a zero window update to one or more peer nodes, generating a surrogate partition associated with the first node, copying network states from an original partition associated with the first node to the surrogate partition, restoring the network states on the surrogate partition, and transmitting another window update to the one or more peer nodes.

Claims

1. A method for handling transmission control protocol (TCP) data between networked computer nodes during blackout periods associated with live kernel updating, the method comprising:

initiating a live kernel update on a first node, wherein the live kernel update comprises performing a network blocking procedure;

transmitting, prior to performing the network blocking procedure, a zero window update to one or more peer nodes;

generating a surrogate partition associated with the first node;

copying network states from an original partition associated with the first node to the surrogate partition;

restoring the network states on the surrogate partition; and

transmitting another window update to the one or more peer nodes.

2. The method according to claim 1, further comprising:

transmitting a live kernel update notice to each peer node from the one or more peer nodes; and

wherein, in response to receiving the zero window update and the live kernel update notice, each peer node from the one or more peer nodes temporarily increases a capacity of a socket send buffer.

3. The method according to claim 2, further comprising:

transmitting a live kernel update completion notice to a first peer node; and

wherein, in response to receiving the live kernel update completion notice, the first peer node reduces the capacity of the socket send buffer.

4. The method according to claim 2, further comprising:

transmitting a temporary buffer inflation permission to a first peer node during connection establishment; and

wherein the first peer node temporarily increases the capacity of the socket send buffer based on receiving the zero window update and the live kernel update notice, and the temporary buffer inflation permission.

5. The method according to claim 1, wherein transmitting the zero window update comprises:

scanning a list of process control blocks for a TCP connection; and

transmitting the zero window update through the TCP connection.

6. The method according to claim 1, wherein transmitting the another window update comprises:

scanning, during performing the network blocking procedure, a list of process control blocks for a TCP connection; and

transmitting, after performing the network blocking procedure, the another window update through the TCP connection.

7. The method according to claim 5, wherein transmitting the another window update comprises:

scanning, during performing the network blocking procedure, the list of process control blocks for all TCP connections; and

transmitting, after performing the network blocking procedure, the another window update through all TCP connections.

8. A computer program product for handling transmission control protocol (TCP) data between networked computer nodes during blackout periods associated with live kernel updating, the computer program product comprising at least one computer readable non-transitory storage medium having computer readable program instructions thereon for execution by a processor, the computer readable program instructions comprising program instructions for:

initiating a live kernel update on a first node, wherein the live kernel update comprises performing a network blocking procedure;

transmitting, prior to performing the network blocking procedure, a zero window update to one or more peer nodes;

generating a surrogate partition associated with the first node;

copying network states from an original partition associated with the first node to the surrogate partition;

restoring the network states on the surrogate partition; and

transmitting another window update to the one or more peer nodes.

9. The computer program product according to claim 8, wherein the computer readable program instructions further comprise program instructions for:

transmitting a live kernel update notice to each peer node from the one or more peer nodes; and

wherein, in response to receiving the zero window update and the live kernel update notice, each peer node from the one or more peer nodes temporarily increases a capacity of a socket send buffer.

10. The computer program product according to claim 9, wherein the computer readable program instructions further comprise program instructions for:

transmitting a live kernel update completion notice to a first peer node; and

wherein, in response to receiving the live kernel update completion notice, the first peer node reduces the capacity of the socket send buffer.

11. The computer program product according to claim 9, wherein the computer readable program instructions further comprise program instructions for:

transmitting a temporary buffer inflation permission to a first peer node during connection establishment; and

wherein the first peer node temporarily increases the capacity of the socket send buffer based on receiving the zero window update and the live kernel update notice, and the temporary buffer inflation permission.

12. The computer program product according to claim 8, wherein transmitting the zero window update comprises:

scanning a list of process control blocks for a TCP connection; and

transmitting the zero window update through the TCP connection.

13. The computer program product according to claim 8, wherein transmitting the another window update comprises:

scanning, during performing the network blocking procedure, a list of process control blocks for a TCP connection; and

transmitting, after performing the network blocking procedure, the another window update through the TCP connection.

14. The computer program product according to claim 12, wherein transmitting the another window update comprises:

scanning, during performing the network blocking procedure, the list of process control blocks for all TCP connections; and

transmitting, after performing the network blocking procedure, the another window update through all TCP connections.

15. A computer system for handling transmission control protocol (TCP) data between networked computer nodes during blackout periods associated with live kernel updating, the computer system comprising:

at least one processing unit;

at least one computer readable memory;

at least one computer readable tangible, non-transitory storage medium; and

program instructions stored on the at least one computer readable tangible, non-transitory storage medium for execution by the at least one processing unit via the at least one computer readable memory, wherein the program instructions comprise program instructions for;

initiating a live kernel update on a first node, wherein the live kernel update comprises performing a network blocking procedure;

transmitting, prior to performing the network blocking procedure, a zero window update to one or more peer nodes generating a surrogate partition associated with the first node;

copying network states from an original partition associated with the first node to the surrogate partition;

restoring the network states on the surrogate partition; and

transmitting another window update to the one or more peer nodes.

16. The computer system according to claim 15, wherein the program instructions further comprise program instructions for:

transmitting a live kernel update notice to each peer node from the one or more peer nodes; and

wherein, in response to receiving the zero window update and the live kernel update notice, each peer node from the one or more peer nodes temporarily increases a capacity of a socket send buffer.

17. The computer system according to claim 16, wherein the program instructions further comprise program instructions for:

transmitting a live kernel update completion notice to a first peer node; and

wherein, in response to receiving the live kernel update completion notice, the first peer node reduces the capacity of the socket send buffer.

18. The computer system according to claim 16, wherein the program instructions further comprise program instructions for:

transmitting a temporary buffer inflation permission to a first peer node during connection establishment; and

wherein the first peer node temporarily increases the capacity of the socket send buffer based on receiving the zero window update and the live kernel update notice, and the temporary buffer inflation permission.

19. The computer system according to claim 15, wherein transmitting the zero window update comprises:

scanning a list of process control blocks for a TCP connection; and

transmitting the zero window update through the TCP connection.

20. The computer system according to claim 15, wherein transmitting the another window update comprises:

scanning, during performing the network blocking procedure, a list of process control blocks for a TCP connection; and

transmitting, after performing the network blocking procedure, the another window update through the TCP connection.