Transmitting retry request associated with non-posted command via response credit channel

A computing device comprising:

• an interface configured to:
• receive requests to complete non-posted commands and requests to complete posted commands via a request credit channel, wherein each non-posted command is a memory read command, a memory read lock command, an input/output (I/O) read command, an I/O write command, a configuration read command, or a configuration write command, and wherein each posted command is a memory write command or a messaging command;
• and
• transmit requests to retry non-posted commands via a response credit channel;
• and
• a controller configured to:
• remove a request to complete a particular non-posted command from the request credit channel;
• initiate transmission of a retry request prompting a reissue of the request to complete the particular non-posted command via the response credit channel, wherein the retry request includes a retry bit in an enabled state, and wherein the retry bit in the enabled state is used by a second computing device to identify the retry request;
• and
• the interface further configured to after transmitting the retry request via the response credit channel, receive a second request to complete the particular non-posted command via the request credit channel based on the retry bit in the retry request in the enabled state, wherein the request credit channel transmits requests to complete commands from the second computing device to the computing device, and the response credit channel transmits retry requests prompting reissues of requests to complete commands from the computing device to the second computing device.

A non-transitory computer readable medium comprising a program product comprising program code resident within the non-transitory computer readable medium, wherein the program code is configured to be executed by a processor to:

• transmit a first request to complete a non-posted command to a destination device via a request credit channel of a bus, wherein the bus is configured to transmit requests to complete non-posted commands and requests to complete posted commands to the destination device, and wherein each non-posted command is a memory read command, a memory read lock command, an input/output (I/O) read command, an I/O write command, a configuration read command, or a configuration write command, and wherein each posted command is a memory write command or a messaging command;
• receive a retry request prompting a reissue of the request to complete the non-posted command from the destination device via a response credit channel of the bus, wherein the retry request includes a retry bit in an enabled state, and wherein the retry bit in the enabled state is used to identify the retry request;
• and
• transmit a second request to complete the non-posted command to the destination device via the request credit channel of the bus based on the retry bit in the retry request in the enabled state, wherein the request credit channel of the bus transmits requests to complete commands to the destination device, and the response credit channel transmits retry requests prompting reissues of requests to complete commands from the destination device.