netdev - [PATCH v2] net/cdc_ncm: Fix multicast RX support for CDC NCM devices with ZLP

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Date:   Mon, 21 Nov 2022 21:53:05 +0100
From:   Santiago Ruano Rincón 
        <santiago.ruano-rincon@...-atlantique.fr>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Oliver Neukum <oliver@...kum.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org,
        Santiago Ruano Rincón 
        <santiago.ruano-rincon@...-atlantique.fr>
Subject: [PATCH v2] net/cdc_ncm: Fix multicast RX support for CDC NCM devices with ZLP

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@...-atlantique.fr>
---
V1 -> V2: Fixed Fixes: tag format and removed stray blank line in changelog

 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 */
-- 
2.38.1