linux-kernel - [PATCH net-next] qmi_wwan: Add rawip module param

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Message-ID: <20230912-qmiraw-v1-1-21bc812fa0cf@axis.com>
Date:   Tue, 12 Sep 2023 09:04:13 +0200
From:   Stefan x Nilsson <stefan.x.nilsson@...s.com>
To:     Bjørn Mork <bjorn@...k.no>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel@...s.com>,
        Stefan x Nilsson <stefan.x.nilsson@...s.com>
Subject: [PATCH net-next] qmi_wwan: Add rawip module param

Certain QMI modems will start communicating in rawip mode after
bootup, and will not work properly if communication starts off in
ethernet mode. So add a module parameter, rawip_as_default, that
can be used to load the qmi driver in rawip mode.

The advantage compared to changing rawip at a later point using
sysfs is that the os will not detect the device and start talking
to it while the driver is still in incorrect mode.

Signed-off-by: Stefan x Nilsson <stefan.x.nilsson@...s.com>
---
 drivers/net/usb/qmi_wwan.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 344af3c5c836..968c60ececf8 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -46,6 +46,10 @@
  * commands on a serial interface
  */
 
+/* Module parameters */
+static bool rawip_as_default;
+module_param(rawip_as_default, bool, 0644);
+
 /* driver specific data */
 struct qmi_wwan_state {
 	struct usb_driver *subdriver;
@@ -843,6 +847,13 @@ static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
 	}
 	dev->net->netdev_ops = &qmi_wwan_netdev_ops;
 	dev->net->sysfs_groups[0] = &qmi_wwan_sysfs_attr_group;
+
+	/* Set the driver into rawip mode if requested by module param */
+	if (rawip_as_default) {
+		info->flags |= QMI_WWAN_FLAG_RAWIP;
+		qmi_wwan_netdev_setup(dev->net);
+	}
+
 err:
 	return status;
 }

---
base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c
change-id: 20230828-qmiraw-b8bcbaed14ab

Best regards,
-- 
Stefan x Nilsson <stefan.x.nilsson@...s.com>