tools/testing/selftests/net/ecmp_rehash.sh

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/ecmp_rehash.sh
Extension
.sh
Size
35284 bytes
Lines
1110
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

if ($i == "pkt") { print $(i-1); exit }
		}'
}

# Read a TcpExt counter from /proc/net/netstat in a namespace.
# Returns 0 if the counter is not found.
get_netstat_counter()
{
	local ns=$1; shift
	local field=$1; shift
	local val

	# shellcheck disable=SC2016
	val=$(ip netns exec "$ns" awk -v key="$field" '
		/^TcpExt:/ {
			if (!h) { split($0, n); h=1 }
			else {
				split($0, v)
				for (i in n)
					if (n[i] == key) print v[i]
			}
		}
	' /proc/net/netstat)
	echo "${val:-0}"
}

# Apply netem ECN marking: CE-mark all ECT packets instead of dropping them.
mark_ecn()
{
	local ns=$1; shift
	local dev=$1; shift

	ip netns exec "$ns" tc qdisc add dev "$dev" root netem loss 100% ecn
}

# Block TCP (IPv6 next-header = 6) egress, allowing ICMPv6 through.
block_tcp()
{
	local ns=$1; shift
	local dev=$1; shift

	ip netns exec "$ns" tc qdisc add dev "$dev" root handle 1: prio
	ip netns exec "$ns" tc filter add dev "$dev" parent 1: \
		protocol ipv6 prio 1 u32 match u8 0x06 0xff at 6 action drop
}

unblock_tcp()
{
	local ns=$1; shift
	local dev=$1; shift

	ip netns exec "$ns" tc qdisc del dev "$dev" root 2>/dev/null
}

# Return success when a device's TX counter exceeds a baseline value.
dev_tx_packets_above()
{
	local ns=$1; shift
	local dev=$1; shift
	local baseline=$1; shift

	local cur
	cur=$(link_tx_packets_get "$ns" "$dev")
	[ "$cur" -gt "$baseline" ]
}

# Return success when both devices have dropped at least one TCP packet.
both_devs_attempted()
{
	local ns=$1; shift

Annotation

Implementation Notes