Adding USB network adapter (was: OpenWrt 18.06.1 on Raspberry Pi 3 Model B Rev 1.2)

here the output:

root@OpenWrt:~# lsmod
brcmfmac              156584  0
brcmutil                4736  1 brcmfmac
cdc_ether               4608  1 rndis_host
cfg80211              211792  1 brcmfmac
compat                  4864  2 brcmfmac,cfg80211
crc_ccitt               1152  1 ppp_async
dwc2                   98048  0
ehci_hcd               34828  1 ehci_platform
ehci_platform           4736  0
evdev                  10752  0
fat                    44088  1 vfat
hid                    84504  2 usbhid,hid_generic
hid_generic              896  0
ip_tables               9828  3 iptable_nat,iptable_mangle,iptable_filter
ip6_tables              9496  2 ip6table_mangle,ip6table_filter
ip6t_REJECT             1152  2
ip6table_filter          896  1
ip6table_mangle         1152  0
ipt_MASQUERADE           896  1
ipt_REJECT              1024  2
iptable_filter          1024  1
iptable_mangle          1152  0
iptable_nat             1152  1
libcomposite           27408  1 usb_f_ecm
mcs7830                 4608  0
nf_conntrack           58948  9 nf_conntrack_ipv6,xt_state,xt_conntrack,xt_CT,nf_nat_masquerade_ipv4,nf_conntrack_ipv4,nf_nat_ipv4,nf_nat,nf_conntrack_rtcache
nf_conntrack_ipv4       5888  9
nf_conntrack_ipv6       6144  4
nf_conntrack_rtcache    2688  0
nf_defrag_ipv4          1024  1 nf_conntrack_ipv4
nf_defrag_ipv6         21384  1 nf_conntrack_ipv6
nf_log_common           2560  2 nf_log_ipv4,nf_log_ipv6
nf_log_ipv4             3328  0
nf_log_ipv6             3328  0
nf_nat                  9738  4 xt_nat,nf_nat_redirect,nf_nat_masquerade_ipv4,nf_nat_ipv4
nf_nat_ipv4             3586  1 iptable_nat
nf_nat_masquerade_ipv4    1540  1 ipt_MASQUERADE
nf_nat_redirect         1024  1 xt_REDIRECT
nf_reject_ipv4          2048  1 ipt_REJECT
nf_reject_ipv6          2304  1 ip6t_REJECT
nls_cp437               5632  1
nls_iso8859_1           4096  1
nls_utf8                1024  0
ppp_async               6532  0
ppp_generic            21664  3 pppoe,ppp_async,pppox
pppoe                   8448  2
pppox                   1440  1 pppoe
rndis_host              4992  0
slhc                    4096  1 ppp_generic
snd                    43320  8 snd_compress,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_rawmidi,snd_seq_device,snd_hwdep
snd_compress            6912  0
snd_hwdep               4872  0
snd_mixer_oss          12672  1 snd_pcm_oss
snd_pcm                59536  2 snd_pcm_dmaengine,snd_pcm_oss
snd_pcm_dmaengine       2432  0
snd_pcm_oss            31008  0
snd_rawmidi            15264  0
snd_seq_device          2440  1 snd_rawmidi
snd_timer              15416  1 snd_pcm
soundcore               3984  1 snd
u_ether                 8064  1 usb_f_ecm
udc_core                8584  4 usb_f_ecm,u_ether,libcomposite,dwc2
usb_f_ecm               4864  0
usbhid                 22824  0
vfat                    7424  1
x_tables               11784 23 ipt_REJECT,ipt_MASQUERADE,xt_time,xt_tcpudp,xt_state,xt_nat,xt_multiport,xt_mark,xt_mac,xt_limit,xt_conntrack,xt_comment,xt_TCPMSS,xt_REDIRECT,xt_LOG,xt_CT,iptable_mangle,iptable_filter,ip_tables,ip6t_REJECT,ip6table_mangle,ip6table_filter,ip6_tables
xhci_hcd               81680  1 xhci_plat_hcd
xhci_plat_hcd           5376  0
xt_CT                   2816  0
xt_LOG                  1024  0
xt_REDIRECT              896  0
xt_TCPMSS               2688  0
xt_comment               768107
xt_conntrack            2304 12
xt_limit                1284 20
xt_mac                   896  0
xt_mark                  896  0
xt_multiport            1408  0
xt_nat                  1536  0
xt_state                 896  0
xt_tcpudp               2048  8
xt_time                 1664  0
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