tools/testing/selftests/drivers/net/hw/loopback.sh
Source file repositories/reference/linux-study-clean/tools/testing/selftests/drivers/net/hw/loopback.sh
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/drivers/net/hw/loopback.sh- Extension
.sh- Size
- 1683 bytes
- Lines
- 104
- 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.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
ALL_TESTS="loopback_test"
NUM_NETIFS=2
lib_dir=$(dirname "$0")
source "$lib_dir"/../../../net/forwarding/tc_common.sh
source "$lib_dir"/../../../net/forwarding/lib.sh
h1_create()
{
simple_if_init $h1 192.0.2.1/24
tc qdisc add dev $h1 clsact
}
h1_destroy()
{
tc qdisc del dev $h1 clsact
simple_if_fini $h1 192.0.2.1/24
}
h2_create()
{
simple_if_init $h2
}
h2_destroy()
{
simple_if_fini $h2
}
loopback_test()
{
RET=0
tc filter add dev $h1 ingress protocol arp pref 1 handle 101 flower \
skip_hw arp_op reply arp_tip 192.0.2.1 action drop
$MZ $h1 -c 1 -t arp -q
tc_check_packets "dev $h1 ingress" 101 1
check_fail $? "Matched on a filter without loopback setup"
ethtool -K $h1 loopback on
check_err $? "Failed to enable loopback"
setup_wait_dev $h1
$MZ $h1 -c 1 -t arp -q
tc_check_packets "dev $h1 ingress" 101 1
check_err $? "Did not match on filter with loopback"
ethtool -K $h1 loopback off
check_err $? "Failed to disable loopback"
$MZ $h1 -c 1 -t arp -q
tc_check_packets "dev $h1 ingress" 101 2
check_fail $? "Matched on a filter after loopback was removed"
tc filter del dev $h1 ingress protocol arp pref 1 handle 101 flower
log_test "loopback"
}
setup_prepare()
Annotation
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: atlas-only.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.