US 12,222,826 B2
Traffic isolation at a chip-to-chip gateway of a data processing system
Ashok Kumar Tummala, Cedar Park, TX (US); FNU Parshant, Leander, TX (US); Rishabh Jain, Austin, TX (US); Apurva Patel, Austin, TX (US); Surabhi Garg, Austin, TX (US); and Sai Kumar Marri, Austin, TX (US)
Assigned to Arm Limited, Cambridge (GB)
Filed by Arm Limited, Cambridge (GB)
Filed on Feb. 1, 2023, as Appl. No. 18/104,458.
Prior Publication US 2024/0256406 A1, Aug. 1, 2024
Int. Cl. G06F 11/07 (2006.01); G06F 11/20 (2006.01)
CPC G06F 11/2007 (2013.01) [G06F 11/07 (2013.01); G06F 11/203 (2013.01); G06F 2201/805 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving a transaction request at a gateway of a link between a host processor and a device;
allocating an entry for the transaction request in a local request tracker of the gateway;
sending, by dispatch logic of the gateway, a link request, to a port of the gateway, where the link request is based on the transaction request;
in response to an isolation trigger:
entering an error isolation mode by moving the port into isolation;
completing in-process transaction requests with entries in the local request tracker for which a link request has been dispatched and no response yet received; and
marking the local request tracker entries as locked and disabling allocation of the entries; and
on receiving a response to an in-process transaction request while in the error isolation mode:
dropping the response;
marking the associated entry as unlocked and enabling allocation of the entry; and
completing a new transaction request for the entry at the gateway by sending completion response without dispatching a new link request to the port.