TCP time stamp processing in hardware based TCP offload
View Patent ↗A method for sending/receiving a TCP segment is provided. The sending process includes, determining if a TCP port can be offloaded; saving a host system's time stamp value; replacing a host system's time stamp value with a TCP offload engine (“TOE”) adapter's time stamp value; and sending the TCP segment via the TOE adapter. The receiving process includes verifying if a TCP port is being offloaded by a host system to the TOE adpter; retrieving the host system's time stamp value; and inserting the host system's time stamp value in the received TCP segment before the forwarding the received TCP segment to the host system.
1. A method for sending a TCP segment, comprising:
determining if a TCP port can be offloaded;
saving a host system's time stamp value;
replacing a host system's time stamp value with a TCP offload engine (TOE”) adapter's time stamp value; and
sending the TCP segment via the TOE adapter.
2. The method of claim 1 , wherein the host system obtains the TOE adapter time stamp value before replacing the host time stamp value.
3. The method of claim 1 , wherein the host system time stamp value is different from the TOE adapter time stamp value.
4. The method of claim 1 , wherein the TCP segment is a SYN segment.
5. The method of claim 1 , wherein the TCP segment is an ACK segment.
6. A method for processing received TCP segments, by a TCP offload engine (“TOE”) adapter, comprising:
verifying if a TCP port is being offloaded by a host system to the TOE adapter;
retrieving the host system's time stamp value; and
inserting the host system's time stamp value in the received TCP segment before forwarding the received TCP segment to the host system.
7. The method of claim 6 , wherein the received segment is a SYN segment.
8. The method of claim 6 , wherein the received segment is an ACK segment.
9. The method of claim 6 , wherein the host system time stamp value is different from the TOE adapter time stamp value.
10. A system for exchanging TCP segments, comprising:
a server having an adapter for sending and receiving TCP segments; and
a host system having a TCP offload (“TOE”) adapter for processing a TCP/IP stack in hardware, wherein if a TCP port can be offloaded then the host system's time stamp value is saved and the host system's time stamp value is replaced with a TOE adapter's time stamp value before a TCP segment is sent via the TOE adapter.
11. The system of claim 10 , wherein the host system obtains the TOE adapter time stamp value before replacing the host time stamp value.
12. The system of claim 10 , wherein the host system time stamp value is different from the TOE adapter time stamp value.
13. The system of claim 10 , wherein the TCP segment is a SYN segment.
14. The system of claim 10 , wherein the TCP segment is an ACK segment.
15. A system for processing exchanging TCP segments, comprising:
a server having an adapter for sending and receving TCP segments; and
a host system having a TCP offload (“TOE”) adapter for processing a TCP/IP stack in hardware, wherein after verifying if a TCP port is being offloaded by the host system to the TOE adapter; the host system's time stamp value is retrieved; and the host system's time stamp value is inserted in the received TCP segment before forwarding the received TCP segment to the host system.
16. The system of claim 15 , wherein the received segment is a SYN segment.
17. The system of claim 15 , wherein the received segment is an ACK segment.
18. The system of claim 15 , wherein the host system time stamp value is different from the TOE adapter time stamp value.