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rndis_host: enable RX aggregation for OnePlus Nord CE 2

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USB tethering on the OnePlus Nord CE 2 (IV2201, USB ID 22d9:2766)
running Android 13 has download speeds of approximately 2mbps
with the default 2048-byte receive limit.

The phone's published RNDIS code only enables packet batching
when the computer reports a receive limit above 2048 bytes.
Testing shows that increasing this limit to 2560 bytes
restores normal speeds.

Add a quirk for USB device 22d9:2766 to use and advertise a
receive buffer of at least 16 KiB. This fits the phone code's default
batch of ten packets at a 1500-byte MTU.

Tested on 7.3.0-rc5 with the affected phone, including reconnecting
USB tethering. Download speeds with the change exceed 100mpbs.

Link: 3c1e3d432d/drivers/usb/gadget/function/f_rndis.c (L538-L551)
Link: 3c1e3d432d/drivers/usb/gadget/function/u_ether.c (L869-L874)
Signed-off-by: Rokas Juras <asrokasjuras@gmail.com>
Link: https://patch.msgid.link/20261005074852.76818-1-asrokasjuras@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Rokas Juras 2026-10-05 10:48:52 +03:00 committed by Jakub Kicinski
parent 9142c2f8f8
commit f688218baa
2 changed files with 24 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/usb/rndis_host.c
View File

@ -345,6 +345,11 @@ generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
dev->rx_urb_size &= ~(dev->maxpacket - 1);
/* some devices require a receive limit above 2048 for RX aggregation */
if (dev->driver_info->data & RNDIS_DRIVER_DATA_RX_AGGREGATION)
dev->rx_urb_size = max_t(size_t, dev->rx_urb_size, 16 * 1024);
u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
net->netdev_ops = &rndis_netdev_ops;
@ -612,6 +617,17 @@ static const struct driver_info rndis_info = {
.tx_fixup = rndis_tx_fixup,
};
static const struct driver_info rndis_rx_aggregation_info = {
.description = "RNDIS device",
.flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
.data = RNDIS_DRIVER_DATA_RX_AGGREGATION,
.bind = rndis_bind,
.unbind = rndis_unbind,
.status = rndis_status,
.rx_fixup = rndis_rx_fixup,
.tx_fixup = rndis_tx_fixup,
};
static const struct driver_info rndis_poll_status_info = {
.description = "RNDIS device (poll status before control)",
.flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
@ -649,6 +665,11 @@ static const struct driver_info rndis_info_lowpower = {
static const struct usb_device_id products [] = {
{
/* OnePlus Nord CE 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x22d9, 0x2766,
USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
.driver_info = (unsigned long)&rndis_rx_aggregation_info,
}, {
/* 2Wire HomePortal 1000SW */
USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
USB_CLASS_COMM, 2 /* ACM */, 0x0ff),

5
include/linux/usb/rndis_host.h
View File

@ -182,8 +182,9 @@ struct rndis_keepalive_c { /* IN (optionally OUT) */
#define FLAG_RNDIS_PHYM_WIRELESS 0x0002
/* Flags for driver_info::data */
#define RNDIS_DRIVER_DATA_POLL_STATUS 1 /* poll status before control */
#define RNDIS_DRIVER_DATA_DST_MAC_FIXUP 2 /* device ignores configured MAC address */
#define RNDIS_DRIVER_DATA_POLL_STATUS 1 /* poll status before control */
#define RNDIS_DRIVER_DATA_DST_MAC_FIXUP 2 /* device ignores configured MAC address */
#define RNDIS_DRIVER_DATA_RX_AGGREGATION 4 /* needs RX limit > 2048 */
extern void rndis_status(struct usbnet *dev, struct urb *urb);
extern int