摘要:
A network interface adapter provides a host processor with two complementary modes of submitting descriptors to be executed by the adapter: a normal mode, in which the host writes descriptors to a system memory and rings an assigned doorbell to notify the adapter; and a priority mode, in which the host writes the descriptor itself to a doorbell address of the adapter. In the priority mode, the adapter is relieved of the need to read the descriptor from the memory, and can thus begin execution as soon as it has resources available to do so.
摘要:
A method for preventing deadlock in communication between a host software application and a network interface card (NIC), comprises writing a doorbell associated with at least one descriptor having a descriptor context to a buffer in the NIC, dropping at least one doorbell from the buffer if the buffer is full, thereby allowing a write of a new doorbell to the buffer, and recovering each dropped doorbell for further execution of descriptors associated with this doorbell. The descriptor execution is in order of posting by the application to the NIC. A system implementing the method comprises a doorbell drop mechanism and a doorbell recovery mechanism.
摘要:
A method for preventing deadlock in communication between a host software application and a network interface card (NIC), comprises writing a doorbell associated with at least one descriptor having a descriptor context to a buffer in the NIC, dropping at least one doorbell from the buffer if the buffer is full, thereby allowing a write of a new doorbell to the buffer, and recovering each dropped doorbell for further execution of descriptors associated with this doorbell. The descriptor execution is in order of posting by the application to the NIC. A system implementing the method comprises a doorbell drop mechanism and a doorbell recovery mechanism.
摘要:
A device and methods are provided for accessing memory. In one embodiment, a method includes receiving a request for data stored in a device, checking a local memory for data based on the request to determine if one or more blocks of data associated with the request are stored in the local memory, and generating a memory access request for one or more blocks of data stored in a memory of the device based when one or more blocks of data are not stored in the local memory. In one embodiment, data stored in memory of the device may be arranged in a configuration to include a plurality of memory access units each having adjacent lines of pixel data to define a single line of memory within the memory access units. Memory access units may be configured based on memory type and may reduce the number of undesired pixels read.