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net/cdc_ncm: Enable ZLP for DisplayLink ethernet devices

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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@synaptics.com>
Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@synaptics.com>
Link: https://lore.kernel.org/r/20220720060518.541-1-lukasz.spintzyk@synaptics.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Dominik Czerwik 2022-07-20 08:05:17 +02:00 committed by Paolo Abeni
parent bf2200e849
commit 266c0190ae
1 changed files with 24 additions and 1 deletions
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25
drivers/net/usb/cdc_ncm.c
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@ -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),