tools/testing/selftests/net/forwarding/tc_taprio.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/forwarding/tc_taprio.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/forwarding/tc_taprio.sh
Extension
.sh
Size
10490 bytes
Lines
422
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

ALL_TESTS=" \
	test_clock_jump_backward \
	test_taprio_after_ptp \
	test_max_sdu \
	test_clock_jump_backward_forward \
"
NUM_NETIFS=4
source tc_common.sh
source lib.sh
source tsn_lib.sh

require_command python3

# The test assumes the usual topology from the README, where h1 is connected to
# swp1, h2 to swp2, and swp1 and swp2 are together in a bridge.
# Additional assumption: h1 and h2 use the same PHC, and so do swp1 and swp2.
# By synchronizing h1 to swp1 via PTP, h2 is also implicitly synchronized to
# swp1 (and both to CLOCK_REALTIME).
h1=${NETIFS[p1]}
swp1=${NETIFS[p2]}
swp2=${NETIFS[p3]}
h2=${NETIFS[p4]}

UDS_ADDRESS_H1="/var/run/ptp4l_h1"
UDS_ADDRESS_SWP1="/var/run/ptp4l_swp1"

H1_IPV4="192.0.2.1"
H2_IPV4="192.0.2.2"
H1_IPV6="2001:db8:1::1"
H2_IPV6="2001:db8:1::2"

# Tunables
NUM_PKTS=100
STREAM_VID=10
STREAM_PRIO_1=6
STREAM_PRIO_2=5
STREAM_PRIO_3=4
# PTP uses TC 0
ALL_GATES=$((1 << 0 | 1 << STREAM_PRIO_1 | 1 << STREAM_PRIO_2))
# Use a conservative cycle of 10 ms to allow the test to still pass when the
# kernel has some extra overhead like lockdep etc
CYCLE_TIME_NS=10000000
# Create two Gate Control List entries, one OPEN and one CLOSE, of equal
# durations
GATE_DURATION_NS=$((CYCLE_TIME_NS / 2))
# Give 2/3 of the cycle time to user space and 1/3 to the kernel
FUDGE_FACTOR=$((CYCLE_TIME_NS / 3))
# Shift the isochron base time by half the gate time, so that packets are
# always received by swp1 close to the middle of the time slot, to minimize
# inaccuracies due to network sync
SHIFT_TIME_NS=$((GATE_DURATION_NS / 2))

path_delay=

h1_create()
{
	simple_if_init $h1 $H1_IPV4/24 $H1_IPV6/64
}

h1_destroy()
{
	simple_if_fini $h1 $H1_IPV4/24 $H1_IPV6/64
}

h2_create()
{
	simple_if_init $h2 $H2_IPV4/24 $H2_IPV6/64

Annotation

Implementation Notes