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what is qdma

by Anika Champlin Jr. Published 3 months ago Updated 1 month ago
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Quadrature-division multiple access (QDMA) is a radio protocol. The term combines two standard terms in telecommunications, CDMA and QPSK.

Full Answer

What is QDMA Linux driver?

QDMA Linux Driver is designed to configure and control the PCI based QDMA device connected to a x86 Host system. It is a loadable kernel module which has three main components libqdma is a library which provides the APIs to manage the functions, queues and mailbox communication.

When will the QDMA solution be available?

The QDMA solution provides support for multiple Physical/ Virtual Functions with scalable queues, and is ideal for applications that require small packet performance at low latency. The QDMA solution is available for early access beta customers in 2018.1 (April, 2018).

How to identify the DMA bar in QDMA?

Upon identifying the DMA Bar, Driver identifies the User Bar using register QDMA_GLBL2_PF_VF_BARLITE_INT ( (0x10C for PF and 0x1018 for VF) and the remaining bar is marked as bypass bar. xdev is a libqdma level bok keeping structure which holds the information required for each function.

What are QDMA’s five-year mission goals?

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What is Qdma Xilinx?

The Xilinx® LogiCORE™ QDMA for PCI Express® (PCIe) implements a high performance, configurable Scatter Gather DMA for use with the PCI Express Integrated Block. The IP provides an optional AXI4-MM or AXI4-Stream user interface.

What is Qdma driver?

QDMA driver provides the sysfs interface to enable to user to perform system level configurations. QDMA PF and VF drivers expose several sysfs nodes under the pci device root node. sysfs provides an interface to configure the module.

What is Qdma PCIe?

The Xilinx PCI Express Multi Queue DMA (QDMA) IP provides high-performance direct memory access (DMA) via PCI Express. The PCIe QDMA can be implemented in UltraScale+ devices.

What is QDMA Linux?

QDMA Linux Driver is designed to configure and control the PCI based QDMA device connected to a x86 Host system. It is a loadable kernel module which has three main components

What is QDMA Linux driver?

QDMA Linux Driver manages the all the qdma PCI devices with matching vendor id and device id listed in pci_ids table listed in pci_ids.h . Each physical device connected over PCI to the x86 Host system is identified by the PCI bus number. Within each physical device, It can have multiple functions and each function is treated as a PCI device and identified by the function number.

What is libqdma_dev?

libqdma treats each function as a dma device and represents them using xlnx_dma_dev (xdev) . During initialization, qdma driver probes each PCI function and creates the corresponding xdev . xdev is a driver level software structure maintained to preserve the software level details to manage a function. libqdma also creates another data structure qdma_dev (qdev) corresponds to each function to keep track of the h2c and c2h descriptor lists associated with each function. qdma_descq (descq) is a data structure maintained for each queue in the system. qdev tracks the the list of queues associated with a function using descq and it in turn stores xdev.

What is Xdev in libqdma?

xdev is a libqdma level bok keeping structure which holds the information required for each function. It is created from pdev and device configuration updated according. Once the xdev is created, it is added to the xdev list to keep track of the multiple functions.

What is dma from device?

dma-from-device and dma-to-device utilities are provided with QDMA Linux driver to perform a read (C2H) and write (H2C) operations on a queue.

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