Introduction to RDMA programming

最新推荐文章于 2023-11-01 11:25:49 发布

原创最新推荐文章于 2023-11-01 11:25:49 发布 · 1.2k 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍了RDMA（远程直接内存访问）中CAS（比较并交换）操作的具体实现方式。通过设置ibv_send_wr结构中的opcode为IBV_WR_ATOMIC_CMP_AND_SWP，并指定远程地址、比较值及交换值来完成原子操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

The goal of the client is to copy a string buffer (give by the user using -s parameter) from a source buffer (identified by src) to a destination buffer (identified by dst) using a remote server buffer as a temporary buffer.

terms:

Queue Pair - the actual object that transfers data, it encapsulates both Send and Receive Queue.

Outstanding - Every Work Request that was posted is considered “outstanding” until it ends with Work completion.

//RDMA CAS
struct ibv_send_wr sr; 
sr.opcode = IBV_WR_ATOMIC_CMP_AND_SWP;

/* sr.wr.atomic.remote_addr: remote start address (uint64_t)
 * sr.wr.atomic.compare_add: value to compare (uint64_t)
 * sr.wr.atomic.swap: value to swap if the comparison passed (uint64_t)
 */