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RDMAP 运行在 iWARP-DDP 之上。RDMAP 直接向应用程序提供读写服务,并支持将数据直接传输到上层协议(ULP)缓冲区,而无需中间数据复制。它还支持一种绕过内核的实现方式。
该协议于 2007 年 10 月在 RFC 5040 中定义。
{{{Frame 42 (1110 bytes on wire, 1110 bytes captured)
Arrival Time: Mar 27, 2008 17:31:45.022540000 [Time delta from previous captured frame: 0.000040000 seconds] [Time delta from previous displayed frame: 0.000040000 seconds] [Time since reference or first frame: 0.001439000 seconds] Frame Number: 42 Frame Length: 1110 bytes Capture Length: 1110 bytes [Frame is marked: False] [Protocols in frame: eth:ip:tcp:iwarp_mpa:iwarp_ddp_rdmap:data] [Coloring Rule Name: TCP] [Coloring Rule String: tcp]
Ethernet II, Src: Ibm_8d:3c:cd (00:11:25:8d:3c:cd), Dst: Ibm_8d:3b:73 (00:11:25:8d:3b:73)
Destination: Ibm_8d:3b:73 (00:11:25:8d:3b:73) Source: Ibm_8d:3c:cd (00:11:25:8d:3c:cd) Type: IP (0x0800)
Internet Protocol, Src: 10.0.0.19 (10.0.0.19), Dst: 10.0.0.18 (10.0.0.18)
Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) Total Length: 1096 Identification: 0x3077 (12407) Flags: 0x04 (Don't Fragment) Fragment offset: 0 Time to live: 64 Protocol: TCP (0x06) Header checksum: 0xf214 [correct] Source: 10.0.0.19 (10.0.0.19) Destination: 10.0.0.18 (10.0.0.18)
Transmission Control Protocol, Src Port: 34185 (34185), Dst Port: 4210 (4210), Seq: 68, Ack: 21001, Len: 1044
Source port: 34185 (34185) Destination port: 4210 (4210) Sequence number: 68 (relative sequence number) [Next sequence number: 1112 (relative sequence number)] Acknowledgement number: 21001 (relative ack number) Header length: 32 bytes Flags: 0x18 (PSH, ACK) Window size: 50048 (scaled) Checksum: 0xf4cd [correct] Options: (12 bytes) [SEQ/ACK analysis]
iWARP Marker Protocol data unit Aligned framing iWARP Direct Data Placement and Remote Direct Memory Access Protocol
DDP header RDMAP header
RDMAP control field
01.. .... = Version: 1
.00 .... = Reserved: 0x00
... 0010 = OpCode: Read Response (0x02)
Data (1024 bytes)
0000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 ................ 0010 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 ................ <snip> ... <\snip> 03d0 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 ................ 03e0 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 ................ 03f0 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 ................
Data: 020202020202020202020202020202020202020202020202...
}}}
iWARP-RDMAP dissector 功能完整。由于 iWARP-RDMAP 和 iWARP-DDP 的头部存在重叠,并且在实践中几乎不会看到没有 RDMAP 运行在其上的 iWARP-DDP,因此我们构建了一个组合 dissector,将这两个协议一起实现为 iwarp_ddp_rdmap。我们在最近一次 Sharkfest 上与 Guy Harris 讨论过这一点。
没有首选项设置。
SampleCaptures/iwarp_send_recv.tar.gz
SampleCaptures/iwarp_rdma.tar.gz
可在显示过滤器参考中找到完整的 iWARP-RDMAP 显示过滤器字段列表
仅显示基于 iWARP-RDMAP 的流量:
iwarp_ddp_rdmap捕获时无法直接过滤 iWARP-RDMAP 协议。不过,如果你知道所使用的 TCP 端口(见上文),可以基于该端口进行过滤。
Imported from https://wiki.wireshark.org/iWARP-RDMAP on 2020-08-11 23:15:35 UTC