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System and method for placement of sharing physical buffer lists in RDMA communication

  • US 20050223118A1
  • Filed: 08/11/2004
  • Published: 10/06/2005
  • Est. Priority Date: 04/05/2004
  • Status: Abandoned Application
First Claim
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1. A network adapter system for use in a computer system including a host processor and host memory and for use in network communication in accordance with a direct data placement (DDP) protocol, wherein said DDP protocol specifies tagged and untagged data movement into a connection-specific application buffer in a contiguous region of virtual memory space of a corresponding endpoint computer application executing on said host processor, said DDP protocol specifying the permissibility of memory regions in host memory and specifying the permissibility of at least one memory window within a memory region, said memory regions and memory windows having independently definable application access rights, the network adapter system comprising:

  • adapter memory;

    a plurality of physical buffer lists in said adapter memory, each physical buffer list specifying physical address locations of host memory corresponding to one of said memory regions;

    a plurality of steering tag records in said adapter memory, each steering tag record corresponding to a steering tag, and each steering tag record specifying memory locations and access permissions for one of a memory region and a memory window;

    wherein each physical buffer list is capable of having a one to many correspondence with steering tag records such that many memory windows may share a single physical buffer list.

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