Max number of simulated wlans with mac80211_hwsim

Question

For some reason when running

sudo modprobe mac80211_hwsim radios=n

when n is greater than 100 the comand returns:

modprobe: ERROR: could not insert 'mac80211_hwsim': Invalid argument

is there any limit on simulated radios? because linux kernel page says mac80211_hwsim is a Linux kernel module that can be used to simulate arbitrary number of IEEE 802.11 radios for mac8021

Answer 1

Looking at the source of mac80211_hwsim.c from the current kernel (6.0.6 as of writing) it is indeed limited to 100:

if (radios < 0 || radios > 100)
    return -EINVAL;