Method and System for Resilience to GID Table Changes in Workloads

A non-transitory computer readable storage medium storing instructions that when executed by one or more computer processors cause the one or more computer processors to perform steps for communicating in a networked computing environment using remote direct memory access (RDMA), the steps comprising:

• maintaining, for a plurality of network interface cards (NICs), a mapping between identifiers and corresponding identifier index values in a data structure;
• for each NIC in the plurality of NICs, maintaining a set of address handles, wherein each address handle includes a source identifier index and destination identifier index pair, wherein the NIC uses an address handle from an address handle pool to transmit data packets to one or more other NICs;
• monitoring the data structure to detect changes to identifier index values;
• detecting that a first identifier index assigned to a particular index has changed to a second identifier index;
• in response to detecting that the first identifier index assigned to the particular index has changed to the second identifier index, identifying a NIC associated with the particular index;
• updating the address handle pool corresponding to the identified NIC to use the second identifier index instead of the first identifier index for the particular index;
• and
• transmitting data packets using the updated address handle pool from the NIC to one or more other NICs.

A computer system comprising:

• one or more computer processors;
• and
• a non-transitory computer readable storage medium storing instructions that when executed by one or more computer processors cause the one or more computer processors to perform steps for communicating in a networked computing environment using remote direct memory access (RDMA), the steps comprising:
• maintaining, for a plurality of network interface cards (NICs), a mapping between identifiers and corresponding identifier index values in a data structure;
• for each NIC in the plurality of NICs, maintaining a set of address handles, wherein each address handle includes a source identifier index and destination identifier index pair, wherein the NIC uses an address handle from an address handle pool to transmit data packets to one or more other NICs;
• monitoring the data structure to detect changes to identifier index values;
• detecting that a first identifier index assigned to a particular index has changed to a second identifier index;
• in response to detecting that the first identifier index assigned to the particular index has changed to the second identifier index, identifying a NIC associated with the particular index;
• updating the address handle pool corresponding to the identified NIC to use the second identifier index instead of the first identifier index for the particular index;
• and
• transmitting data packets using the updated address handle pool from the NIC to one or more other NICs.