INSTALL.DPDK.md: Provide a little a more consistency to documentation.

A few users (based on the reports in [email protected]) have been
literally following the instructions in INSTALL.DPDK.md and mixing up
pre-installed utilities and daemons with freshly compiled utilities
because the current documentation does not consistently call out
using utilities from the compiled sources.

This commit updates DPDK documentation to ask users to do a 'make install'
and then use the utilities and daemons directly from Linux PATH.
It also adds github markup where applicable.

Reported-by: Arkajit Ghosh <[email protected]>
Signed-off-by: Gurucharan Shetty <[email protected]>
Acked-by: Pravin B Shelar <[email protected]>

AUTHORS

@@ -198,6 +198,7 @@ Anton Matsiuk           [email protected]
 Anup Khadka             [email protected]
 Anuprem Chalvadi        [email protected]
 Ariel Tubaltsev         [email protected]
+Arkajit Ghosh           [email protected]
 Atzm Watanabe           [email protected]
 Bastian Blank           [email protected]
 Ben Basler              [email protected]

INSTALL.DPDK.md

@@ -91,35 +91,33 @@ Using the DPDK with ovs-vswitchd:
 
    Ref to http://www.dpdk.org/doc/quick-start for verifying DPDK setup.
 
-4. Start ovsdb-server as discussed in [INSTALL.md] doc:
+4. Follow the instructions in [INSTALL.md] to install only the
+   userspace daemons and utilities (via 'make install').
    1. First time only db creation (or clearing):
 
-        ```
-        mkdir -p /usr/local/etc/openvswitch
-        mkdir -p /usr/local/var/run/openvswitch
-        rm /usr/local/etc/openvswitch/conf.db
-        cd $OVS_DIR
-        ./ovsdb/ovsdb-tool create /usr/local/etc/openvswitch/conf.db \
-             ./vswitchd/vswitch.ovsschema
-        ```
+      ```
+      mkdir -p /usr/local/etc/openvswitch
+      mkdir -p /usr/local/var/run/openvswitch
+      rm /usr/local/etc/openvswitch/conf.db
+      ovsdb-tool create /usr/local/etc/openvswitch/conf.db  \
+             /usr/local/share/openvswitch/vswitch.ovsschema
+      ```
 
-    2. start ovsdb-server
+   2. Start ovsdb-server
 
-        ```
-        cd $OVS_DIR
-        ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock \
+      ```
+      ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock \
           --remote=db:Open_vSwitch,Open_vSwitch,manager_options \
           --private-key=db:Open_vSwitch,SSL,private_key \
           --certificate=Open_vSwitch,SSL,certificate \
           --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert --pidfile --detach
-        ```
+      ```
 
     3. First time after db creation, initialize:
 
-        ```
-        cd $OVS_DIR
-        ./utilities/ovs-vsctl --no-wait init
-        ```
+       ```
+       ovs-vsctl --no-wait init
+       ```
 
 5. Start vswitchd:
 
@@ -128,32 +126,38 @@ Using the DPDK with ovs-vswitchd:
    dpdk arg -c is ignored by ovs-dpdk, but it is a required parameter
    for dpdk initialization.
 
-        export DB_SOCK=/usr/local/var/run/openvswitch/db.sock
-        ./vswitchd/ovs-vswitchd --dpdk -c 0x1 -n 4 -- unix:$DB_SOCK --pidfile --detach
+   ```
+   export DB_SOCK=/usr/local/var/run/openvswitch/db.sock
+   ovs-vswitchd --dpdk -c 0x1 -n 4 -- unix:$DB_SOCK --pidfile --detach
+   ```
 
-   If allocated more than one GB hugepage (as for IVSHMEM), set amount and use NUMA
-   node 0 memory:
+   If allocated more than one GB hugepage (as for IVSHMEM), set amount and
+   use NUMA node 0 memory:
 
-        ./vswitchd/ovs-vswitchd --dpdk -c 0x1 -n 4 --socket-mem 1024,0 \
-          -- unix:$DB_SOCK --pidfile --detach
+   ```
+   ovs-vswitchd --dpdk -c 0x1 -n 4 --socket-mem 1024,0 \
+   -- unix:$DB_SOCK --pidfile --detach
+   ```
 
 6. Add bridge & ports
           
    To use ovs-vswitchd with DPDK, create a bridge with datapath_type
    "netdev" in the configuration database.  For example:
 
-        `ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev`
+   `ovs-vsctl add-br br0 -- set bridge br0 datapath_type=netdev`
 
    Now you can add dpdk devices. OVS expect DPDK device name start with dpdk
-   and end with portid. vswitchd should print (in the log file) the number of dpdk
-   devices found.
+   and end with portid. vswitchd should print (in the log file) the number
+   of dpdk devices found.
 
-        ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk
-        ovs-vsctl add-port br0 dpdk1 -- set Interface dpdk1 type=dpdk
+   ```
+   ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk
+   ovs-vsctl add-port br0 dpdk1 -- set Interface dpdk1 type=dpdk
+   ```
 
-    Once first DPDK port is added to vswitchd, it creates a Polling thread and
-    polls dpdk device in continuous loop. Therefore CPU utilization
-    for that thread is always 100%.
+   Once first DPDK port is added to vswitchd, it creates a Polling thread and
+   polls dpdk device in continuous loop. Therefore CPU utilization
+   for that thread is always 100%.
 
 7. Add test flows
 
@@ -180,14 +184,14 @@ Using the DPDK with ovs-vswitchd:
    interfaces on the same numa node.  The following two commands can be used
    to configure the multi-threading behavior.
 
-        ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=<hex string>
+   `ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=<hex string>`
 
-   The command above asks for a CPU mask for setting the affinity of pmd threads.
-   A set bit in the mask means a pmd thread is created and pinned to the
-   corresponding CPU core.  For more information, please refer to
+   The command above asks for a CPU mask for setting the affinity of pmd
+   threads.  A set bit in the mask means a pmd thread is created and pinned
+   to the corresponding CPU core.  For more information, please refer to
    `man ovs-vswitchd.conf.db`
 
-        ovs-vsctl set Open_vSwitch . other_config:n-dpdk-rxqs=<integer>
+   `ovs-vsctl set Open_vSwitch . other_config:n-dpdk-rxqs=<integer>`
 
    The command above sets the number of rx queues of each DPDK interface. The
    rx queues are assigned to pmd threads on the same numa node in round-robin
@@ -208,12 +212,14 @@ Using the DPDK with ovs-vswitchd:
 
    Configure pmd threads on core 4,6,8,10 using 'pmd-cpu-mask':
 
-        ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=00000550
+   `ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=00000550`
 
    You should be able to check that pmd threads are pinned to the correct cores
    via:
 
-        top -p `pidof ovs-vswitchd` -H -d1
+   ```
+   top -p `pidof ovs-vswitchd` -H -d1
+   ```
 
    Note, the pmd threads on a numa node are only created if there is at least
    one DPDK interface from the numa node that has been added to OVS.
@@ -228,7 +234,7 @@ Following the steps above to create a bridge, you can now add dpdk rings
 as a port to the vswitch.  OVS will expect the DPDK ring device name to
 start with dpdkr and end with a portid.
 
-    ovs-vsctl add-port br0 dpdkr0 -- set Interface dpdkr0 type=dpdkr
+`ovs-vsctl add-port br0 dpdkr0 -- set Interface dpdkr0 type=dpdkr`
 
 DPDK rings client test application
 
@@ -240,8 +246,10 @@ location tests/ovs_client
 
 To run the client :
 
-    cd /usr/src/ovs/tests/
-    ovsclient -c 1 -n 4 --proc-type=secondary -- -n "port id you gave dpdkr"
+```
+cd /usr/src/ovs/tests/
+ovsclient -c 1 -n 4 --proc-type=secondary -- -n "port id you gave dpdkr"
+```
 
 In the case of the dpdkr example above the "port id you gave dpdkr" is 0.