1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3# Copyright(c) 2020 Intel Corporation, Weqaar Janjua <weqaar.a.janjua@intel.com>
4
5# AF_XDP selftests based on veth
6#
7# End-to-end AF_XDP over Veth test
8#
9# Topology:
10# ---------
11#                 -----------
12#               _ | Process | _
13#              /  -----------  \
14#             /        |        \
15#            /         |         \
16#      -----------     |     -----------
17#      | Thread1 |     |     | Thread2 |
18#      -----------     |     -----------
19#           |          |          |
20#      -----------     |     -----------
21#      |  xskX   |     |     |  xskY   |
22#      -----------     |     -----------
23#           |          |          |
24#      -----------     |     ----------
25#      |  vethX  | --------- |  vethY |
26#      -----------   peer    ----------
27#           |          |          |
28#      namespaceX      |     namespaceY
29#
30# AF_XDP is an address family optimized for high performance packet processing,
31# it is XDP’s user-space interface.
32#
33# An AF_XDP socket is linked to a single UMEM which is a region of virtual
34# contiguous memory, divided into equal-sized frames.
35#
36# Refer to AF_XDP Kernel Documentation for detailed information:
37# https://www.kernel.org/doc/html/latest/networking/af_xdp.html
38#
39# Prerequisites setup by script:
40#
41#   Set up veth interfaces as per the topology shown ^^:
42#   * setup two veth interfaces and one namespace
43#   ** veth<xxxx> in root namespace
44#   ** veth<yyyy> in af_xdp<xxxx> namespace
45#   ** namespace af_xdp<xxxx>
46#   *** xxxx and yyyy are randomly generated 4 digit numbers used to avoid
47#       conflict with any existing interface
48#   * tests the veth and xsk layers of the topology
49#
50# See the source xskxceiver.c for information on each test
51#
52# Kernel configuration:
53# ---------------------
54# See "config" file for recommended kernel config options.
55#
56# Turn on XDP sockets and veth support when compiling i.e.
57# 	Networking support -->
58# 		Networking options -->
59# 			[ * ] XDP sockets
60#
61# Executing Tests:
62# ----------------
63# Must run with CAP_NET_ADMIN capability.
64#
65# Run:
66#   sudo ./test_xsk.sh
67#
68# If running from kselftests:
69#   sudo make run_tests
70#
71# Run with verbose output:
72#   sudo ./test_xsk.sh -v
73#
74# Run and dump packet contents:
75#   sudo ./test_xsk.sh -D
76#
77# Run test suite for physical device in loopback mode
78#   sudo ./test_xsk.sh -i IFACE
79
80. xsk_prereqs.sh
81
82ETH=""
83
84while getopts "vDi:" flag
85do
86	case "${flag}" in
87		v) verbose=1;;
88		D) dump_pkts=1;;
89		i) ETH=${OPTARG};;
90	esac
91done
92
93TEST_NAME="PREREQUISITES"
94
95URANDOM=/dev/urandom
96[ ! -e "${URANDOM}" ] && { echo "${URANDOM} not found. Skipping tests."; test_exit $ksft_fail; }
97
98VETH0_POSTFIX=$(cat ${URANDOM} | tr -dc '0-9' | fold -w 256 | head -n 1 | head --bytes 4)
99VETH0=ve${VETH0_POSTFIX}
100VETH1_POSTFIX=$(cat ${URANDOM} | tr -dc '0-9' | fold -w 256 | head -n 1 | head --bytes 4)
101VETH1=ve${VETH1_POSTFIX}
102NS0=root
103NS1=af_xdp${VETH1_POSTFIX}
104MTU=1500
105
106trap ctrl_c INT
107
108function ctrl_c() {
109        cleanup_exit ${VETH0} ${VETH1} ${NS1}
110	exit 1
111}
112
113setup_vethPairs() {
114	if [[ $verbose -eq 1 ]]; then
115	        echo "setting up ${VETH0}: namespace: ${NS0}"
116	fi
117	ip netns add ${NS1}
118	ip link add ${VETH0} numtxqueues 4 numrxqueues 4 type veth peer name ${VETH1} numtxqueues 4 numrxqueues 4
119	if [ -f /proc/net/if_inet6 ]; then
120		echo 1 > /proc/sys/net/ipv6/conf/${VETH0}/disable_ipv6
121	fi
122	if [[ $verbose -eq 1 ]]; then
123	        echo "setting up ${VETH1}: namespace: ${NS1}"
124	fi
125
126	if [[ $busy_poll -eq 1 ]]; then
127	        echo 2 > /sys/class/net/${VETH0}/napi_defer_hard_irqs
128		echo 200000 > /sys/class/net/${VETH0}/gro_flush_timeout
129		echo 2 > /sys/class/net/${VETH1}/napi_defer_hard_irqs
130		echo 200000 > /sys/class/net/${VETH1}/gro_flush_timeout
131	fi
132
133	ip link set ${VETH1} netns ${NS1}
134	ip netns exec ${NS1} ip link set ${VETH1} mtu ${MTU}
135	ip link set ${VETH0} mtu ${MTU}
136	ip netns exec ${NS1} ip link set ${VETH1} up
137	ip netns exec ${NS1} ip link set dev lo up
138	ip link set ${VETH0} up
139}
140
141if [ ! -z $ETH ]; then
142	VETH0=${ETH}
143	VETH1=${ETH}
144	NS1=""
145else
146	validate_root_exec
147	validate_veth_support ${VETH0}
148	validate_ip_utility
149	setup_vethPairs
150
151	retval=$?
152	if [ $retval -ne 0 ]; then
153		test_status $retval "${TEST_NAME}"
154		cleanup_exit ${VETH0} ${VETH1} ${NS1}
155		exit $retval
156	fi
157fi
158
159
160if [[ $verbose -eq 1 ]]; then
161	ARGS+="-v "
162fi
163
164if [[ $dump_pkts -eq 1 ]]; then
165	ARGS="-D "
166fi
167
168retval=$?
169test_status $retval "${TEST_NAME}"
170
171## START TESTS
172
173statusList=()
174
175TEST_NAME="XSK_SELFTESTS_${VETH0}_SOFTIRQ"
176
177exec_xskxceiver
178
179if [ -z $ETH ]; then
180	cleanup_exit ${VETH0} ${VETH1} ${NS1}
181fi
182TEST_NAME="XSK_SELFTESTS_${VETH0}_BUSY_POLL"
183busy_poll=1
184
185if [ -z $ETH ]; then
186	setup_vethPairs
187fi
188exec_xskxceiver
189
190## END TESTS
191
192if [ -z $ETH ]; then
193	cleanup_exit ${VETH0} ${VETH1} ${NS1}
194fi
195
196failures=0
197echo -e "\nSummary:"
198for i in "${!statusList[@]}"
199do
200	if [ ${statusList[$i]} -ne 0 ]; then
201	        test_status ${statusList[$i]} ${nameList[$i]}
202		failures=1
203	fi
204done
205
206if [ $failures -eq 0 ]; then
207        echo "All tests successful!"
208fi
209