From: Santiago Ruano Rincón santiago.ruano-rincon@imt-atlantique.fr
[ Upstream commit 748064b54c99418f615aabff5755996cd9816969 ]
ZLP for DisplayLink ethernet devices was enabled in 6.0: 266c0190aee3 ("net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices"). The related driver_info should be the "same as cdc_ncm_info, but with FLAG_SEND_ZLP". However, set_rx_mode that enables handling multicast traffic was missing in the new cdc_ncm_zlp_info.
usbnet_cdc_update_filter rx mode was introduced in linux 5.9 with: e10dcb1b6ba7 ("net: cdc_ncm: hook into set_rx_mode to admit multicast traffic")
Without this hook, multicast, and then IPv6 SLAAC, is broken.
Fixes: 266c0190aee3 ("net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices") Signed-off-by: Santiago Ruano Rincón santiago.ruano-rincon@imt-atlantique.fr Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/cdc_ncm.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 8d5cbda33f66..0897fdb6254b 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -1915,6 +1915,7 @@ static const struct driver_info cdc_ncm_zlp_info = { .status = cdc_ncm_status, .rx_fixup = cdc_ncm_rx_fixup, .tx_fixup = cdc_ncm_tx_fixup, + .set_rx_mode = usbnet_cdc_update_filter, };
/* Same as cdc_ncm_info, but with FLAG_WWAN */