Docs: readme files of dmm-rsocket

Change-Id: I552262478f5f379d4fdda5bf58eb4b0c22cf9fb5
Signed-off-by: julis john <zhanglixin4@huawei.com>

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+# 1. What is rsocket
+Rsockets is a protocol over RDMA that supports a socket-level API for
+applications.
+The dmm_rsocket adapted to DMM based on the librdmacm 1.1.0 version make it a
+protocol in DMM framework.
+
+# 2. How to use DMM-rsocket
+
+## How to integrate rsocket into DMM
+![](rsocket1.png)
+The file CMakeList.txt defined the compiling process, including downloading
+librdmacm 1.1.0 and patch it with rsocket.patch. The patch will
+modify the related files when necessary, and finally provide
+library of "libdmm_rdmacm.a" and "libdmm_rsocket.so".
+
+Target 'dmm_rsocket' could not be get automatically unless you run 'make dmm_rsocket' manually.
+'make dmm_rsocket' will compile the adaption code and linking with libdmm_rdmacm.a.
+
+![](rsocket2.png)
+
+## Compile
+(refer to dmm/doc/Build_DMM.md)
+```sh
+    #cd dmm/build && cmake ..
+    #make help
+    #make dmm_rsocket
+```
+Note:
+  After these processes, libdmm_rsocket.so protocol module would be created in
+dmm/release/lib64/libdmm_rsocket.so
+
+## Test
+- Steps 1: update some environment variables
+```sh
+	#export LD_LIBRARY_PATH=${dmm}/release/lib64
+	#export LD_PRELOAD=${dmm}/release/lib64/libnStackAPI.so
+	#export NSTACK_MOD_CFG_FILE=${dmm}/stacks/rsocket/config/module_config.json
+	#export NSTACK_MOD_CFG_RD=${dmm}/stacks/rsocket/config/rd_config.json
+```
+- Steps 2: Modify rd_config.json(located at dmm/stacks/rsocket/config/)
+```sh
+	#vim rd_config.json
+	  //set "subnet": "192.168.21.1/24"
+```
+Note:
+  Means dmm will hijack data from subnet 192.168.21.*
+
+- Steps 3: Communication test between machine A(as server) with machine B
+		(as client)
+
+##### Run in machine A
+```sh
+	#./dmm/release/bin/vs_epoll -p 20000 -d 192.168.21.180 -a 10000 -s 192.168.21.181 -l 1000 -t 500000 -i 0 -f 1 -r 20000 -n 1 -w 10 -u 50000 -e 10 -x 1
+```
+Note:
+  Means the current machine would be server, and it's
+destination address is 192.168.21.180 (client address),
+source address is 192.168.21.181(server address)
+
+##### Run in machine B
+```
+	#./dmm/release/bin/vc_common -p 20000 -d 192.168.21.181 -a 10000 -s 192.168.21.180 -l 1000 -t 500000 -i 0 -f 1 -r 20000 -n 1 -w 10 -u 50000 -e 10 -x 1
+```
+Note:
+  Means the current machine would be client, and it's
+destination address is 192.168.21.181 (server address),
+source address is 192.168.21.180(client address)
+
+# 3. Document description
+
+(dmm/stacks/rsocket)
+
+## CMakeLists.txt
+Control file for Cmake compiling.
+
+## config folder
+##### module_config.json
+- module_config.json is for configuring dmm protocol stack module
+
+##### rd_config.json
+- rd_config.json is to choose which module is better to go through. It will go
+	through rsocket protocol stack when RD type is nstack-rsocket
+
+## rsocket.patch
+For the librdmacm patch, the key modification is to find the point where the
+epoll event is executed, all using the DMM_RSOCKET macro control.
+Other changes are to package the hijacked API, so that the code can calls
+libc API directly to avoid calls to the hijacked functions in the DMM,
+all using GSAPI macro control.
+
+## src folder
+##### rsocket_adpt.c && rsocket_adpt.h
+- Rsocket adaptation section, including initialization and adaptation functions.
+
+##### rsocket_rdma.h
+- Public header file.
+
+##### rsocket_in.h && rsocket_rs.c
+- rsocket_in.h is included in rsocket.c.(rsocket.c is located at
+	dmm/stacks/rsocket/librdmacm-1.1.0/src)
+- rsocket_rs.c is embedded at the end of rsocket.c
+
+##### rsocket_sapi.h
+- List of libc functions which only be used internally.
+
+# 4. More Information
+https://wiki.fd.io/view/DMM
+https://github.com/ofiwg/librdmacm/blob/master/docs/rsocket
+https://github.com/rsocket/rsocket
+http://www.mellanox.com/page/products_dyn?product_family=26
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