可以看到,和我们软件填的 ibv_send_wr 是相似的。注意到一个细节,我们填的 wr_id 没有出现在 WQE 中,实际上这个 wr_id 是存在 rdma-core 里的。因为 WQE 是按序处理的,收到 CQE 的时候可以找到当初提交的 ibv_send_wr。Doorbell 通知网卡 post_send_db 这个函数很简单,但是细节非常多:首先,这个函...
通信的两端都需要进行QP的初始化,Communication Manager (CM)在双方真正建立连接前交换QP信息。 Once a QP is established, the verbs API can be used to perform RDMA reads, RDMA writes, and atomic operations. Serialized send/receive operations, which are similar to socket reads/writes, can be perfor...
1911 1.704461 GID: fe80::9a03:9bff:fe92:1ae6 GID: fe80::9a03:9bff:fe9a:4296RoCE134UC Send OnlyQP=0x00fd47 RC send RoCE 17 0.000203 GID: fe80::9a03:9bff:fe92:1ae6 GID: fe80::9a03:9bff:fe9a:2b3aRoCE114RC Send OnlyQP=0x00f798 RRoCE 14584 0.041138 192.169.31.53 192.169.31.54R...
1911 1.704461 GID: fe80::9a03:9bff:fe92:1ae6 GID: fe80::9a03:9bff:fe9a:4296 RoCE 134 UC Send Only QP=0x00fd47 RC send RoCE 17 0.000203 GID: fe80::9a03:9bff:fe92:1ae6 GID: fe80::9a03:9bff:fe9a:2b3a RoCE 114 RC Send Only QP=0x00f798 RRoCE 14584 0.041138 192.169.31.53 1...
RDMA提供基于两种操作原语的数据传输服务:单边操作包括RDMA READ、WRITE、ATOMIC(例如,FAA、CAS),双边操作包括RDMA SEND、RECV。RDMA通信是通过一个消息队列模型实现的,称为队列对(QP)和完成队列(CQ)。QP包括发送队列(SQ)和接收队列(RQ)。发送方将请求提交到SQ(单边或双边操作),而RQ用于在双边操作中排队RDMA RECV...
static struct cmatesttest;static int connections=1;static int message_size=100;static int message_count=10;static int is_sender;static int send_only;static int loopback=1;static int unmapped_addr;static char *dst_addr;static char *src_addr;static enum rdma_port_space port_space=RDMA_PS_UDP...
如果指定send的SQE的 solicited event 标志,硬件从内存中获取数据,然后组装成数据包(SE标志位置1)通过物理链路发送到对端。对端收到后,检测到CQ处于Arm_Sol状态,会产生CEQE告知用户。简单说就是RQE被solicited event标志的SQE消耗后,硬件会产生CQE,并对应产生CEQE,因此只适用Send和Write with imm场景。
PBLE_LEVEL_1 | PBLE_LEVEL_2 : PBLE_LEVEL_0 irdma_setup_pbles -> 使用位掩码重构 PBLE 函数来表示所需的 PBLE 级别,而使用 2 个参数 use_pble 和 lvl_one_only 使代码变得混乱 HW 使用主机内存作为许多协议上下文对象和队列状态跟踪的后备存储。 主机内存缓存 (HMC) 是负责管理存储在主机内存中的...
systems. This is because we do not have the option to have zero copy here; we only have ...
both the address mapping table and the security protection table must be established. However, when registering MW, only the security protection table is established, which allows direct communication between the user and the hardware without the need for kernel intervention.Zero based MR:...