System and method to restore maximum payload size in a network adapter

1. A machine-implemented method, comprising:

storing a host maximum payload size (MPS) value of a host system as an adapter MPS value for an adapter operationally coupled to the host system;

storing a host identifier at the adapter for identifying the host system;

setting an adapter MPS value to the host MPS value;

resetting the adapter MPS value to a default value after an event;

restoring the adapter MPS value to the host MPS value when the host identifier stored at the adapter matches with a host identifier value stored by the host system;

reading the host MPS value from a root complex register of the host system before storing the host MPS value at the adapter; and

storing a new host MPS value and a new host identifier in the adapter when the host identifier stored by the adapter does not match with the host identifier stored by the host system.

2. The method of claim 1 , wherein the event disables the adapter.

3. A machine implemented method, comprising:

determining whether a host system identifier for a host system matches with a host system identifier stored at an adapter operationally coupled to the host system for sending and receiving information;

storing a host maximum payload size (MPS) value of a host system as an adapter MPS value for the adapter;

restoring the adapter MPS value to the host MPS value after an event that resets the adapter MPS value to a default value that is different from the host identifier MPS value;

reading the host MPS value from a root complex register of the host system before storing the host MPS value at the adapter; and

storing a new host MPS value and a new host identifier in the adapter when the host identifier stored by the adapter does not match with the host identifier stored by the host system.

4. A system, comprising:

a host system having a first host system memory location for storing a host maximum payload size (MPS) value and a second host system memory location for storing a host identifier for uniquely identifying the host system; and

an adapter operationally coupled to the host system and having a first adapter memory location for storing the host identifier value that identifies the host system; a second adapter memory location for storing an adapter MPS value that matches the host MPS value; and a third adapter memory location that stores an adapter MPS value when the adapter is initialized;

wherein after the adapter is reset due to an event, the third adapter memory location value is set to the host MPS value when the host identifier stored at the first adapter memory location matches with the host identifier stored at the second host system memory location;

wherein the first host system memory location is a root complex register for storing the host MPS value; and

wherein a new host MPS value and a new host identifier is stored at the adapter when the host identifier stored at the first adapter memory location does not match with the host identifier stored by the host system.

5. The system of claim 4 , wherein the first adapter memory location is located at an adapter memory for storing the host identifier.

6. The system of claim 4 , wherein the second adapter memory location is located at an adapter memory for storing the adapter MPS value that matches with the host MPS value.

7. The system of claim 4 , wherein the third adapter memory location is a register for storing the adapter MPS value that is used by an adapter processor for transferring information to and from the host system.