From: Dominik Czerwik <dominik.czerwik@xxxxxxxxxxxxx> This improves performance and stability of DL-3xxx/DL-5xxx/DL-6xxx device series. Specifically prevents device from temporary network dropouts when playing video from the web and network traffic going through is high. Signed-off-by: Dominik Czerwik <dominik.czerwik@xxxxxxxxxxxxx> Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@xxxxxxxxxxxxx> --- v2: Added Sign-off-by: Bernice Chen as company lawyer. v3: - Remove copyright as this is not really necessary. - Removed Sign-off-by: Bernice Chen v4: No new changes, just resubmit with changed [PATCH v4 2/2] v5: As asked by Oliver Neukum. Mark in original cdc_ncm_info description that it does not send ZLP drivers/net/usb/cdc_ncm.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index d55f59ce4a31..8d5cbda33f66 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -1892,7 +1892,7 @@ static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) } static const struct driver_info cdc_ncm_info = { - .description = "CDC NCM", + .description = "CDC NCM (NO ZLP)", .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_LINK_INTR | FLAG_ETHER, .bind = cdc_ncm_bind, @@ -1904,6 +1904,19 @@ static const struct driver_info cdc_ncm_info = { .set_rx_mode = usbnet_cdc_update_filter, }; +/* Same as cdc_ncm_info, but with FLAG_SEND_ZLP */ +static const struct driver_info cdc_ncm_zlp_info = { + .description = "CDC NCM (SEND ZLP)", + .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET + | FLAG_LINK_INTR | FLAG_ETHER | FLAG_SEND_ZLP, + .bind = cdc_ncm_bind, + .unbind = cdc_ncm_unbind, + .manage_power = usbnet_manage_power, + .status = cdc_ncm_status, + .rx_fixup = cdc_ncm_rx_fixup, + .tx_fixup = cdc_ncm_tx_fixup, +}; + /* Same as cdc_ncm_info, but with FLAG_WWAN */ static const struct driver_info wwan_info = { .description = "Mobile Broadband Network Device", @@ -2010,6 +2023,16 @@ static const struct usb_device_id cdc_devs[] = { .driver_info = (unsigned long)&wwan_info, }, + /* DisplayLink docking stations */ + { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO + | USB_DEVICE_ID_MATCH_VENDOR, + .idVendor = 0x17e9, + .bInterfaceClass = USB_CLASS_COMM, + .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, + .bInterfaceProtocol = USB_CDC_PROTO_NONE, + .driver_info = (unsigned long)&cdc_ncm_zlp_info, + }, + /* Generic CDC-NCM devices */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), -- 2.36.1