summaryrefslogtreecommitdiffstats
path: root/doc/guides/nics/tap.rst
diff options
context:
space:
mode:
authorLuca Boccassi <luca.boccassi@gmail.com>2018-08-14 18:52:30 +0100
committerLuca Boccassi <luca.boccassi@gmail.com>2018-08-14 18:53:17 +0100
commitb63264c8342e6a1b6971c79550d2af2024b6a4de (patch)
tree83114aac64286fe616506c0b3dfaec2ab86ef835 /doc/guides/nics/tap.rst
parentca33590b6af032bff57d9cc70455660466a654b2 (diff)
New upstream version 18.08upstream/18.08
Change-Id: I32fdf5e5016556d9c0a6d88ddaf1fc468961790a Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Diffstat (limited to 'doc/guides/nics/tap.rst')
-rw-r--r--doc/guides/nics/tap.rst30
1 files changed, 26 insertions, 4 deletions
diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst
index ea61be38..27148681 100644
--- a/doc/guides/nics/tap.rst
+++ b/doc/guides/nics/tap.rst
@@ -1,8 +1,8 @@
.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2016 Intel Corporation.
-Tap Poll Mode Driver
-====================
+Tun|Tap Poll Mode Driver
+========================
The ``rte_eth_tap.c`` PMD creates a device using TAP interfaces on the
local host. The PMD allows for DPDK and the host to communicate using a raw
@@ -37,6 +37,12 @@ for each interface string containing ``mac=fixed``. The MAC address is formatted
as 00:'d':'t':'a':'p':[00-FF]. Convert the characters to hex and you get the
actual MAC address: ``00:64:74:61:70:[00-FF]``.
+ --vdev=net_tap0,mac="00:64:74:61:70:11"
+
+The MAC address will have a user value passed as string. The MAC address is in
+format with delimeter ``:``. The string is byte converted to hex and you get
+the actual MAC address: ``00:64:74:61:70:11``.
+
It is possible to specify a remote netdevice to capture packets from by adding
``remote=foo1``, for example::
@@ -77,6 +83,17 @@ can utilize that stack to handle the network protocols. Plus you would be able
to address the interface using an IP address assigned to the internal
interface.
+The TUN PMD allows user to create a TUN device on host. The PMD allows user
+to transmit and receive packets via DPDK API calls with L3 header and payload.
+The devices in host can be accessed via ``ifconfig`` or ``ip`` command. TUN
+interfaces are passed to DPDK ``rte_eal_init`` arguments as ``--vdev=net_tunX``,
+where X stands for unique id, example::
+
+ --vdev=net_tun0 --vdev=net_tun1,iface=foo1, ...
+
+Unlike TAP PMD, TUN PMD does not support user arguments as ``MAC`` or ``remote`` user
+options. Default interface name is ``dtunX``, where X stands for unique id.
+
Flow API support
----------------
@@ -91,7 +108,7 @@ The kernel support can be checked with this command::
Supported items:
- eth: src and dst (with variable masks), and eth_type (0xffff mask).
-- vlan: vid, pcp, tpid, but not eid. (requires kernel 4.9)
+- vlan: vid, pcp, but not eid. (requires kernel 4.9)
- ipv4/6: src and dst (with variable masks), and ip_proto (0xffff mask).
- udp/tcp: src and dst port (0xffff) mask.
@@ -149,7 +166,7 @@ Run pktgen from the pktgen directory in a terminal with a commandline like the
following::
sudo ./app/app/x86_64-native-linuxapp-gcc/app/pktgen -l 1-5 -n 4 \
- --proc-type auto --log-level 8 --socket-mem 512,512 --file-prefix pg \
+ --proc-type auto --log-level debug --socket-mem 512,512 --file-prefix pg \
--vdev=net_tap0 --vdev=net_tap1 -b 05:00.0 -b 05:00.1 \
-b 04:00.0 -b 04:00.1 -b 04:00.2 -b 04:00.3 \
-b 81:00.0 -b 81:00.1 -b 81:00.2 -b 81:00.3 \
@@ -241,6 +258,11 @@ Please refer to ``iproute2`` package file ``lib/bpf.c`` function
An example utility for eBPF instruction generation in the format of C arrays will
be added in next releases
+TAP reports on supported RSS functions as part of dev_infos_get callback:
+``ETH_RSS_IP``, ``ETH_RSS_UDP`` and ``ETH_RSS_TCP``.
+**Known limitation:** TAP supports all of the above hash functions together
+and not in partial combinations.
+
Systems supporting flow API
---------------------------