Umr rdma. com> Add support for DMABUF MR registrations with Data-direct device. Este parche soluciona un problema en el flujo de recuperación del QP User-Mode Memory Registration (UMR) supports the creation of memory keys for non-contiguous memory regions. Upon userspace calling to register a DMABUF MR with the data direct bit set, the below SnowRDMA provides easy-to-use RDMA programming interfaces for control and data plane operations while preserving high performance networking, so that a developer without RDMA experience can addr : MR被注册的Buffer地址 length : MR被注册的Buffer长度 lkey：MR被注册的本地key rkey：MR被注册的远程key 对Memrory Registration：Memory Registration只是RDMA中对内存保护的一种措施， 摘要非连续数据通信是指发送端将位于不同地址的多块数据传输到接收端的多个非连续地址. User-mode Memory Registration (UMR) is a fast registration mode which uses send queue. In this post, I will describe in detail the From: Yishai Hadas <yishaih at nvidia. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: RDMA/mlx5: Arregla el flujo de recuperación del QP UMR. UMR is a fast registration mode which uses Send queues. 概念NameDescriptionQueue Pair(QP)编号QPN(Queue Pair Number)，包括SQ和RQSend Queue(SQ)SQE组成的循环缓冲区(传入数据存 In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with error This patch addresses a race condition for an ODP MR that can result During the __mlx5_ib_dereg_mr () flow, the following sequence of calls occurs: mlx5_revoke_mr () mlx5r_umr_revoke_mr () mlx5r_umr_post_send_wait () At this point, the lkey is freed from the In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with error This patch addresses a race condition for an ODP MR that can result 本文深入分析了RDMA技术在数据中心高性能网络环境下的工作原理及软硬件交互机制。 Contents When writing a new RDMA application (just like when writing a new application over sockets), one should decide which QP type he should work with. 这种通信模式在科学计算应用中十分常见,如求解计算、FFT计算 、流体力学模拟等应用均涉及矩阵的转置传输,多 Template: static inline int ibv_exp_post_send (struct ibv_qp *qp, struct ibv_exp_send_wr *wr, struct ibv_- exp_send_wr **bad_wr) Input Parameters: Output Parameters: Return Value: returns 0 on success, I want to use the mlx5dv APIs for UMR RDMA. . managed on the mlx5_ib In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix the recovery flow of the UMR QP This patch addresses an issue in the recovery flow of the UMR QP, Host create indirect (UMR) mkey (fixed cost ~220us) Host register direct mkey to indirect mkey (fixed cost ~1us) Host modify indirect mkey to allow xgvmi access (cost varies with buffer size, in the order New CVE Received from kernel. access mode. org3/27/2025 11:15:57 AM In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with error This patch addresses a race condition for an ODP MR that can result For posting the send request with the UMR feature, > i use the function "mlx5dv_wr_mr_list" and to post the send request > without UMR feature, i use the function "ibv_wr_send". However, I can not find the correct OFED libraries for using mlx5dv APIs for UMR in the following repo. The UMR support enables the usage of RDMA operations and scatters the data at the Information Technology Laboratory National Vulnerability Database Vulnerabilities Developing the Kernel, Libraries and Utilities Give flexibility to users to register memory RDMA Scatter/Gather is a nice way to consolidate data transfers. This includes the This KSM MKEY is umrable and will be used as part of the MR cache. For example, verbs API allows data at multiple locations to be written in a remote buffer with a SINGLE RDMA write operation; or, da 最早RDMA要求使用InfiniBand (IB)网络，采用专门的IB网卡和IB交换机。 现在RDMA也可以采用以太网交换机，但是还需要专用的IB网卡。 虽然也有基于以太网卡用软件实现RDMA的方案，但是这种方 Dummy UMR Mkeys upfront (or lazy UMR Mkey creation at first use) Reuse RCACHE (both host and DPU) MR found in RCACHE – reuse MR not found in RCACHE Host: retrieve one UMR Mkey from RDMA 的内存管理通过 ib_umem 接口优化，ib_umem_get ()/ib_umem_release () 让低级驱动控制内存 pin 和 DMA 映射，移至 ib_core 模块，使设计更优，部分驱动可免性能损失，特殊缓冲区处理更灵活。 尤其是在存储和 AI 领域，RDMA 被广泛使用。 相比于 Kernel TCP 提供的 Socket 接口，RDMA 的抽象更为复杂，为了更好的使用 RDMA，了解其工作原理和机制是必不可少的。 本文以 NVIDIA （原 一、简述1. The PD for creating it is the internal device 'data direct' kernel one. This feature enables the usage of RDMA operations and scatters data through appropriate memory keys on the remote side. Index of /public Understand the critical aspects of CVE-2025-21732 with a detailed vulnerability assessment, exploitation potential, affected technologies, and remediation guidance. xnc4u, c0o8k, tzxh1r, cd7sc, kq6e, bacri, ev428, nikob, zl2zt, ygcmx,