Function DropReasonsCommand

shell/tracescript.go:679–689

DropReasonsCommand returns the command to fetch SKB drop reason enum from kernel. The enum values are kernel-version specific and must be read at runtime. This reads from the tracepoint format file which contains the enum definition.

()

// The enum values are kernel-version specific and must be read at runtime.
// This reads from the tracepoint format file which contains the enum definition.
func DropReasonsCommand() []string {
	return []string{
		"sh", "-c",
		`echo "=== SKB Drop Reason Codes (kernel-specific) ===" && ` +
			`cat /sys/kernel/debug/tracing/events/skb/kfree_skb/format 2>/dev/null | ` +
			`grep -oE '\{ [0-9]+, "[^"]+" \}' | ` +
			`sed 's/{ \([0-9]*\), "\([^"]*\)" }/\1 = \2/' | ` +
			`head -30 || ` +
			`echo "(Could not read drop reasons - requires debugfs mounted)"`,
	}
}