Atomic Operations execute a 64-bit operation at a specified address on a remote node. The operations atomically read, modify and write the destination address and guarantee that operations on this address by other QPs on the same CA do not occur between the Read and Write. The scope of the atomicity guarantee may optionally extend to other CPUs and HCAs.
Atomic Operations Experimental vs. RDMA-Core Verbs and Device Attributes
| Experimental | RDMA-Core | ||
|---|---|---|---|
| Verbs | |||
| ibv_exp_query_device | exp_atomic_cap
| ibv_query_device_ex |
|
| pci_atomic_caps | pci_atomic_caps | ||
| ibv_exp_reg_mr | ibv_reg_mr | ||
| IBV_EXP_ACCESS_REMOTE_ATOMIC | IBV_ACCESS_REMOTE_ATOMIC | ||
| Device Attributes | |||
IBV_EXP_DEVICE_ATTR_PCI_ATOMIC_CAPS | |||
