Initial commit of Sphinx docs

Change-Id: I9fca8fb98502dffc2555f9de7f507b6f006e0e77
Signed-off-by: John DeNisco <jdenisco@cisco.com>

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+.. _vhostusercommands:
+
+.. toctree::
+
+.. _createvhostuser:
+
+Create Vhost-User
+=================
+
+Create a vHost User interface. Once created, a new virtual interface
+will exist with the name '*VirtualEthernet0/0/x*', where '*x*' is the
+next free index.
+
+There are several parameters associated with a vHost interface:
+
+-  **socket <socket-filename>** - Name of the linux socket used by
+   hypervisor and VPP to manage the vHost interface. If in '*server*'
+   mode, VPP will create the socket if it does not already exist. If in
+   '*client*' mode, hypervisor will create the socket if it does not
+   already exist. The VPP code is indifferent to the file location.
+   However, if SELinux is enabled, then the socket needs to be created
+   in '*/var/run/vpp/*'.
+-  **server** - Optional flag to indicate that VPP should be the server
+   for the linux socket. If not provided, VPP will be the client. In
+   '*server*' mode, the VM can be reset without tearing down the vHost
+   Interface. In '*client*' mode, VPP can be reset without bringing down
+   the VM and tearing down the vHost Interface.
+-  **feature-mask <hex>** - Optional virtio/vhost feature set negotiated
+   at startup. **This is intended for degugging only.** It is
+   recommended that this parameter not be used except by experienced
+   users. By default, all supported features will be advertised.
+   Otherwise, provide the set of features desired.
+
+   -  0x000008000 (15) - VIRTIO_NET_F_MRG_RXBUF
+   -  0x000020000 (17) - VIRTIO_NET_F_CTRL_VQ
+   -  0x000200000 (21) - VIRTIO_NET_F_GUEST_ANNOUNCE
+   -  0x000400000 (22) - VIRTIO_NET_F_MQ
+   -  0x004000000 (26) - VHOST_F_LOG_ALL
+   -  0x008000000 (27) - VIRTIO_F_ANY_LAYOUT
+   -  0x010000000 (28) - VIRTIO_F_INDIRECT_DESC
+   -  0x040000000 (30) - VHOST_USER_F_PROTOCOL_FEATURES
+   -  0x100000000 (32) - VIRTIO_F_VERSION_1
+
+-  **hwaddr <mac-addr>** - Optional ethernet address, can be in either
+   X:X:X:X:X:X unix or X.X.X cisco format.
+-  **renumber <dev_instance>** - Optional parameter which allows the
+   instance in the name to be specified. If instance already exists,
+   name will be used anyway and multiple instances will have the same
+   name. Use with caution.
+
+
+Summary/Usage
+-------------
+
+.. code-block:: shell
+
+    create vhost-user socket <socket-filename> [server] [feature-mask <hex>] [hwaddr <mac-addr>] [renumber <dev_instance>]
+
+
+Examples
+--------
+
+    Example of how to create a vhost interface with VPP as the client
+    and all features enabled:
+
+.. code-block:: console
+
+    vpp# create vhost-user socket /var/run/vpp/vhost1.sock
+    VirtualEthernet0/0/0
+
+Example of how to create a vhost interface with VPP as the server
+and with just multiple queues enabled:
+
+.. code-block:: console
+
+    vpp# create vhost-user socket /var/run/vpp/vhost2.sock server feature-mask 0x40400000
+    VirtualEthernet0/0/1
+
+Once the vHost interface is created, enable the interface using:
+
+.. code-block:: console
+
+    vpp# set interface state VirtualEthernet0/0/0 up
+
+.. _showvhost:
+
+Show Vhost-User
+===============
+
+Display the attributes of a single vHost User interface (provide
+interface name), multiple vHost User interfaces (provide a list of
+interface names seperated by spaces) or all Vhost User interfaces (omit
+an interface name to display all vHost interfaces).
+
+Summary/Usage
+-------------
+
+.. code-block:: shell
+
+    show vhost-user [<interface> [<interface> [..]]] [descriptors].
+
+Examples
+--------
+Example of how to display a vhost interface:
+
+.. code-block:: console
+
+    vpp# show vhost-user VirtualEthernet0/0/0
+    Virtio vhost-user interfaces
+    Global:
+      coalesce frames 32 time 1e-3
+    Interface: VirtualEthernet0/0/0 (ifindex 1)
+    virtio_net_hdr_sz 12
+     features mask (0xffffffffffffffff):
+     features (0x50408000):
+       VIRTIO_NET_F_MRG_RXBUF (15)
+       VIRTIO_NET_F_MQ (22)
+       VIRTIO_F_INDIRECT_DESC (28)
+       VHOST_USER_F_PROTOCOL_FEATURES (30)
+      protocol features (0x3)
+       VHOST_USER_PROTOCOL_F_MQ (0)
+       VHOST_USER_PROTOCOL_F_LOG_SHMFD (1)
+
+     socket filename /var/run/vpp/vhost1.sock type client errno "Success"
+
+    rx placement:
+       thread 1 on vring 1
+       thread 1 on vring 5
+       thread 2 on vring 3
+       thread 2 on vring 7
+     tx placement: spin-lock
+       thread 0 on vring 0
+       thread 1 on vring 2
+       thread 2 on vring 0
+
+    Memory regions (total 2)
+    region fd    guest_phys_addr    memory_size        userspace_addr     mmap_offset        mmap_addr
+    ====== ===== ================== ================== ================== ================== ==================
+      0     60    0x0000000000000000 0x00000000000a0000 0x00002aaaaac00000 0x0000000000000000 0x00002aab2b400000
+      1     61    0x00000000000c0000 0x000000003ff40000 0x00002aaaaacc0000 0x00000000000c0000 0x00002aababcc0000
+
+     Virtqueue 0 (TX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
+      kickfd 62 callfd 64 errfd -1
+
+     Virtqueue 1 (RX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 65 callfd 66 errfd -1
+
+     Virtqueue 2 (TX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
+      kickfd 63 callfd 70 errfd -1
+
+     Virtqueue 3 (RX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 72 callfd 74 errfd -1
+
+     Virtqueue 4 (TX disabled)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 76 callfd 78 errfd -1
+
+     Virtqueue 5 (RX disabled)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 80 callfd 82 errfd -1
+
+     Virtqueue 6 (TX disabled)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+     avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 84 callfd 86 errfd -1
+
+     Virtqueue 7 (RX disabled)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
+      kickfd 88 callfd 90 errfd -1
+
+The optional '*descriptors*' parameter will display the same output as the
+previous example but will include the descriptor table for each queue. The output is truncated below:
+
+.. code-block:: console
+
+    vpp# show vhost-user VirtualEthernet0/0/0 descriptors
+
+    Virtio vhost-user interfaces
+    Global:
+      coalesce frames 32 time 1e-3
+    Interface: VirtualEthernet0/0/0 (ifindex 1)
+    virtio_net_hdr_sz 12
+     features mask (0xffffffffffffffff):
+     features (0x50408000):
+       VIRTIO_NET_F_MRG_RXBUF (15)
+       VIRTIO_NET_F_MQ (22)
+    :
+     Virtqueue 0 (TX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+      avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
+      kickfd 62 callfd 64 errfd -1
+
+      descriptor table:
+       id          addr         len  flags  next      user_addr
+      ===== ================== ===== ====== ===== ==================
+      0     0x0000000010b6e974 2060  0x0002 1     0x00002aabbc76e974
+      1     0x0000000010b6e034 2060  0x0002 2     0x00002aabbc76e034
+      2     0x0000000010b6d6f4 2060  0x0002 3     0x00002aabbc76d6f4
+      3     0x0000000010b6cdb4 2060  0x0002 4     0x00002aabbc76cdb4
+      4     0x0000000010b6c474 2060  0x0002 5     0x00002aabbc76c474
+      5     0x0000000010b6bb34 2060  0x0002 6     0x00002aabbc76bb34
+      6     0x0000000010b6b1f4 2060  0x0002 7     0x00002aabbc76b1f4
+      7     0x0000000010b6a8b4 2060  0x0002 8     0x00002aabbc76a8b4
+      8     0x0000000010b69f74 2060  0x0002 9     0x00002aabbc769f74
+      9     0x0000000010b69634 2060  0x0002 10    0x00002aabbc769634
+      10    0x0000000010b68cf4 2060  0x0002 11    0x00002aabbc768cf4
+    :
+      249   0x0000000000000000 0     0x0000 250   0x00002aab2b400000
+      250   0x0000000000000000 0     0x0000 251   0x00002aab2b400000
+      251   0x0000000000000000 0     0x0000 252   0x00002aab2b400000
+      252   0x0000000000000000 0     0x0000 253   0x00002aab2b400000
+      253   0x0000000000000000 0     0x0000 254   0x00002aab2b400000
+      254   0x0000000000000000 0     0x0000 255   0x00002aab2b400000
+      255   0x0000000000000000 0     0x0000 32768 0x00002aab2b400000
+
+     Virtqueue 1 (RX)
+      qsz 256 last_avail_idx 0 last_used_idx 0
+
+ 
+Debug Vhost-User
+================
+Turn on/off debug for vhost
+
+
+Summary/Usage
+-------------
+
+.. code-block:: shell
+
+    debug vhost-user <on | off>.
+ 
+Delete Vhost-User
+========================
+Delete a vHost User interface using the interface name or the software
+interface index. Use the '*show interface*' command to determine the
+software interface index. On deletion, the linux socket will not be
+deleted.
+
+Summary/Usage
+-------------
+
+.. code-block:: shell
+
+    delete vhost-user {<interface> | sw_if_index <sw_idx>}.
+
+Examples
+--------
+Example of how to delete a vhost interface by name:
+
+.. code-block:: console
+
+    vpp# delete vhost-user VirtualEthernet0/0/1
+
+Example of how to delete a vhost interface by software interface index:
+
+.. code-block:: console
+
+    vpp# delete vhost-user sw_if_index 1