docker: add multiple docker containers support (#574)

Use shared IPC option `--ipc=host` for the docker run command

Signed-off-by: Frank Du <[email protected]>

docker/README.md

@@ -14,19 +14,40 @@ Refer to below build command if you are in a proxy env.
 docker build -t mtl:latest -f ubuntu.dockerfile --build-arg HTTP_PROXY=http://proxy.xxx.com:xxx --build-arg HTTPS_PROXY=https://proxy.xxx.com:xxx ./
 ```
 
-## 2. DPDK NIC PMD and env setup
+## 2. DPDK NIC PMD and env setup on host
 
-Please refer to [run guide](../doc/run.md)
+Follow [run guide](../doc/run.md) to setup the hugepages, driver of NIC PF, vfio driver mode for VFs.
 
-## 3. Run the docker image
+## 3. Run and login into the docker container with root user
+
+The sample usage provided below is enabled with specific privileged settings such as VFIO access, a shared IPC namespace and root user inside the docker.
+
+### 3.1 Run the docker container
+
+The argument `/dev/vfio/` enables the Docker instance to access the VFIO device.
+
+The arguments `/dev/null, /tmp/kahawai_lcore.lock, and --ipc=host` and touch `/tmp/kahawai_lcore.lock` command are used for managing shared memory within IMTL, primarily for lcore management across multiple IMTL docker containers.
+
+```bash
+touch /tmp/kahawai_lcore.lock
+docker run --privileged -it -v /dev/vfio/:/dev/vfio/ -v /dev/null:/dev/null -v /tmp/kahawai_lcore.lock:/tmp/kahawai_lcore.lock --ipc=host mtl:latest
+```
+
+If you confirm that all IMTL processes will run within a single Docker container, you can disregard the settings related to shared memory. Simply execute the following command:
 
 ```bash
-docker run --privileged -it -v /dev/vfio/vfio:/dev/vfio/vfio mtl:latest
+docker run --privileged -it -v /dev/vfio/:/dev/vfio/  mtl:latest
 ```
 
-non-root run need additional permission settings for the vfio and hugepage.
+### 3.2 Switch to the root user inside a Docker container
+
+On the docker bash shell:
+
+```bash
+sudo -s
+```
 
-## 3. Run RxTXApp inside docker
+## 4. Run RxTXApp
 
 ```bash
 cd Media-Transport-Library/

docker/ubuntu.dockerfile

@@ -15,10 +15,13 @@ RUN apt-get update -y
 # Install dependencies
 RUN apt-get install -y git gcc meson python3 python3-pip pkg-config libnuma-dev libjson-c-dev libpcap-dev libgtest-dev libsdl2-dev libsdl2-ttf-dev libssl-dev
 
-RUN pip install pyelftools==0.29 ninja==1.11.1
+RUN pip install pyelftools ninja
 
 RUN apt-get install -y sudo
 
+# some misc tools
+RUN apt-get install -y vim htop
+
 RUN apt clean all
 
 # user: imtl

lib/src/mt_sch.c

@@ -528,8 +528,8 @@ static int sch_init_lcores(struct mt_sch_mgr* mgr) {
     memset(lcore_shm, 0, sizeof(*lcore_shm));
 
   mgr->lcore_shm = lcore_shm;
-  info("%s, shared memory attached at %p nattch %d\n", __func__, mgr->lcore_shm,
-       (int)stat.shm_nattch);
+  info("%s, shared memory attached at %p nattch %d shm_id %d key 0x%x\n", __func__,
+       mgr->lcore_shm, (int)stat.shm_nattch, shm_id, (int)key);
   ret = sch_filelock_unlock(mgr);
   if (ret < 0) {
     err("%s, sch_filelock_unlock fail\n", __func__);