kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_AF_RXRPC_INJECT_RX_DELAY.
Result is shown for kernelversion 6.3-rc3
depends
CONFIG_AF_RXRPC
CONFIG_NET
CONFIG_SYSCTL

Inject delay into packet reception

configname: CONFIG_AF_RXRPC_INJECT_RX_DELAY

Linux Kernel Configuration
└─> Networking support
└─> Inject delay into packet reception

Say Y here to inject a delay into packet reception, allowing an
extended RTT time to be modelled. The delay can be configured using
/proc/sys/net/rxrpc/rxrpc_inject_rx_delay, setting a number of
milliseconds up to 0.5s (note that the granularity is actually in
jiffies).