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    • 3. 发明申请
    • METHODS, APPARATUS AND SYSTEMS FOR FACILITATING RDMA OPERATIONS WITH REDUCED DOORBELL RINGS
    • 方法,装备和系统,用于减少DOORBELL环的RDMA操作
    • US20140089444A1
    • 2014-03-27
    • US13628771
    • 2012-09-27
    • Vadim MakhervaksKenneth G. KeelsBrian S. HausauerAli S. Oztaskin
    • Vadim MakhervaksKenneth G. KeelsBrian S. HausauerAli S. Oztaskin
    • G06F15/167
    • G06F15/17331
    • Methods, apparatus and systems for reducing usage of Doorbell Rings in connection with RDMA operations. A portion of system memory is employed as a Memory-Mapped Input/Output (MMIO) address space configured to be accessed via a hardware networking device. A Send Queue (SQ) is stored in MMIO and is used to facilitate processing of Work Requests (WRs) that are written to SQ entries by software and read from the SQ via the hardware networking device. The software and logic in the hardware networking device employ pointers identifying locations in the SQ corresponding to a next write WR entry slot and last read WR entry slot that are implemented to enable WRs to be written to and read from the SQ during ongoing operations under which the SQ is not emptied such that doorbell rings to notify the hardware networking device that new WRs have been written to the SQ are not required.
    • 与RDMA操作相关的减少门铃环使用的方法,装置和系统。 系统存储器的一部分被用作经配置以经由硬件网络设备访问的存储器映射输入/输出(MMIO)地址空间。 发送队列(SQ)存储在MMIO中,用于促进通过软件写入SQ条目并通过硬件网络设备从SQ读取的工作请求(WR)的处理。 硬件网络设备中的软件和逻辑采用标识SQ中相应于下一个写入WR入口时隙的位置的指针,以及最后读取的WR入口时隙,其被实现为使得在正在进行的操作期间将WR写入到SQ并从其读取, SQ不能清空,以致门铃振铃以通知硬件网络设备不会向SQ写入新的WR。
    • 4. 发明授权
    • Pipelined processing of RDMA-type network transactions
    • 流水线处理RDMA型网络交易
    • US08078743B2
    • 2011-12-13
    • US11356493
    • 2006-02-17
    • Robert O. SharpKenneth G. KeelsBrian S. HausauerEric Rose
    • Robert O. SharpKenneth G. KeelsBrian S. HausauerEric Rose
    • G06F15/16
    • H04L67/1097
    • A computer system such as a server pipelines RNIC interface (RI) management/control operations such as memory registration operations to hide from network applications the latency in performing RDMA work requests caused in part by delays in processing the memory registration operations and the time required to execute the registration operations themselves. A separate QP-like structure, called a control QP (CQP), interfaces with a control processor (CP) to form a control path pipeline, separate from the transaction pipeline, which is designated to handle all control path traffic associated with the processing of RI control operations. This includes memory registration operations (MR OPs), as well as the creation and destruction of traditional QPs for processing RDMA transactions. Once the MR OP has been queued in the control path pipeline of the adapter, a pending bit is set which is associated with the MR OP. Processing of an RDMA work request in the transaction pipeline that has engendered the enqueued MR OP is permitted to proceed as if the processing of the MR OP has already been completed. If the work request gets ahead of the MR OP, the associated pending bit being set will notify the adapter's work request transaction pipeline to stall (and possibly reschedule) completion of the work request until the processing of the MR OP for that memory region is complete. When the memory registration process for the memory region is complete, the associated pending bit is reset and the adapter transaction pipeline is permitted to continue processing the work request using the newly registered memory region.
    • 计算机系统,例如服务器管线RNIC接口(RI)管理/控制操作,诸如存储器注册操作,以从网络应用中隐藏执行RDMA工作请求的延迟部分地由于处理存储器注册操作的延迟和所需的时间 执行注册操作本身。 称为控制QP(CQP)的独立QP类结构与控制处理器(CP)接口,以形成与事务流水线分开的控制路径流水线,其被指定为处理与处理相关联的所有控制路径流量 RI控制操作。 这包括内存注册操作(MR OP),以及创建和销毁用于处理RDMA事务的传统QP。 一旦MR OP已经在适配器的控制路径管道中排队,则设置与MR OP相关联的挂起位。 如果已经完成了MR操作的处理,处理已经引入入站的MR OP的事务流水线中的RDMA工作请求被执行。 如果工作请求超过MR OP,则相关的待处理位将被设置将通知适配器的工作请求事务流水线停止(可能重新计划)工作请求的完成,直到该存储器区域的MR OP的处理完成 。 当存储器区域的存储器注册过程完成时,相关联的挂起位被复位,并且适配器事务流水线被允许使用新登记的存储器区域继续处理工作请求。