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. xsk_prereqs.sh
78
79while getopts "vD" flag
80do
81	case "${flag}" in
82		v) verbose=1;;
83		D) dump_pkts=1;;
84	esac
85done
86
87TEST_NAME="PREREQUISITES"
88
89URANDOM=/dev/urandom
90[ ! -e "${URANDOM}" ] && { echo "${URANDOM} not found. Skipping tests."; test_exit $ksft_fail; }
91
92VETH0_POSTFIX=$(cat ${URANDOM} | tr -dc '0-9' | fold -w 256 | head -n 1 | head --bytes 4)
93VETH0=ve${VETH0_POSTFIX}
94VETH1_POSTFIX=$(cat ${URANDOM} | tr -dc '0-9' | fold -w 256 | head -n 1 | head --bytes 4)
95VETH1=ve${VETH1_POSTFIX}
96NS0=root
97NS1=af_xdp${VETH1_POSTFIX}
98MTU=1500
99
100trap ctrl_c INT
101
102function ctrl_c() {
103        cleanup_exit ${VETH0} ${VETH1} ${NS1}
104	exit 1
105}
106
107setup_vethPairs() {
108	if [[ $verbose -eq 1 ]]; then
109	        echo "setting up ${VETH0}: namespace: ${NS0}"
110	fi
111	ip netns add ${NS1}
112	ip link add ${VETH0} numtxqueues 4 numrxqueues 4 type veth peer name ${VETH1} numtxqueues 4 numrxqueues 4
113	if [ -f /proc/net/if_inet6 ]; then
114		echo 1 > /proc/sys/net/ipv6/conf/${VETH0}/disable_ipv6
115	fi
116	if [[ $verbose -eq 1 ]]; then
117	        echo "setting up ${VETH1}: namespace: ${NS1}"
118	fi
119
120	if [[ $busy_poll -eq 1 ]]; then
121	        echo 2 > /sys/class/net/${VETH0}/napi_defer_hard_irqs
122		echo 200000 > /sys/class/net/${VETH0}/gro_flush_timeout
123		echo 2 > /sys/class/net/${VETH1}/napi_defer_hard_irqs
124		echo 200000 > /sys/class/net/${VETH1}/gro_flush_timeout
125	fi
126
127	ip link set ${VETH1} netns ${NS1}
128	ip netns exec ${NS1} ip link set ${VETH1} mtu ${MTU}
129	ip link set ${VETH0} mtu ${MTU}
130	ip netns exec ${NS1} ip link set ${VETH1} up
131	ip netns exec ${NS1} ip link set dev lo up
132	ip link set ${VETH0} up
133}
134
135validate_root_exec
136validate_veth_support ${VETH0}
137validate_ip_utility
138setup_vethPairs
139
140retval=$?
141if [ $retval -ne 0 ]; then
142	test_status $retval "${TEST_NAME}"
143	cleanup_exit ${VETH0} ${VETH1} ${NS1}
144	exit $retval
145fi
146
147if [[ $verbose -eq 1 ]]; then
148	ARGS+="-v "
149fi
150
151if [[ $dump_pkts -eq 1 ]]; then
152	ARGS="-D "
153fi
154
155test_status $retval "${TEST_NAME}"
156
157## START TESTS
158
159statusList=()
160
161TEST_NAME="XSK_SELFTESTS_SOFTIRQ"
162
163exec_xskxceiver
164
165cleanup_exit ${VETH0} ${VETH1} ${NS1}
166TEST_NAME="XSK_SELFTESTS_BUSY_POLL"
167busy_poll=1
168
169setup_vethPairs
170exec_xskxceiver
171
172## END TESTS
173
174cleanup_exit ${VETH0} ${VETH1} ${NS1}
175
176failures=0
177echo -e "\nSummary:"
178for i in "${!statusList[@]}"
179do
180	if [ ${statusList[$i]} -ne 0 ]; then
181	        test_status ${statusList[$i]} ${nameList[$i]}
182		failures=1
183	fi
184done
185
186if [ $failures -eq 0 ]; then
187        echo "All tests successful!"
188fi
189