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Message-Id: <1530066614-24995-1-git-send-email-subashab@codeaurora.org>
Date: Tue, 26 Jun 2018 20:30:14 -0600
From: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To: bjorn@...k.no, dnlplm@...il.com, dcbw@...hat.com,
davem@...emloft.net, netdev@...r.kernel.org
Cc: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: [PATCH net-next] net: qmi_wwan: Add pass through mode
Pass through mode is to allow packets in MAP format to be passed
on to the stack. rmnet driver can be used to process and demultiplex
these packets. Note that pass through mode can be enabled when the
device is in raw ip mode only.
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
---
drivers/net/usb/qmi_wwan.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 8fac8e1..6eeec92 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -59,6 +59,7 @@ struct qmi_wwan_state {
enum qmi_wwan_flags {
QMI_WWAN_FLAG_RAWIP = 1 << 0,
QMI_WWAN_FLAG_MUX = 1 << 1,
+ QMI_WWAN_FLAG_PASS_THROUGH = 1 << 2,
};
enum qmi_wwan_quirks {
@@ -425,14 +426,82 @@ static ssize_t del_mux_store(struct device *d, struct device_attribute *attr, c
return ret;
}
+static ssize_t pass_through_show(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usbnet *dev = netdev_priv(to_net_dev(d));
+ struct qmi_wwan_state *info;
+
+ info = (void *)&dev->data;
+ return sprintf(buf, "%c\n",
+ info->flags & QMI_WWAN_FLAG_PASS_THROUGH ? 'Y' : 'N');
+}
+
+static ssize_t pass_through_store(struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct usbnet *dev = netdev_priv(to_net_dev(d));
+ struct qmi_wwan_state *info;
+ bool enable;
+ int ret;
+
+ if (strtobool(buf, &enable))
+ return -EINVAL;
+
+ info = (void *)&dev->data;
+
+ /* no change? */
+ if (enable == (info->flags & QMI_WWAN_FLAG_PASS_THROUGH))
+ return len;
+
+ /* pass through mode can be set for raw ip devices only */
+ if (!(info->flags & QMI_WWAN_FLAG_RAWIP)) {
+ netdev_err(dev->net, "Cannot set pass through mode on non ip device\n");
+ return -EINVAL;
+ }
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ /* we don't want to modify a running netdev */
+ if (netif_running(dev->net)) {
+ netdev_err(dev->net, "Cannot change a running device\n");
+ ret = -EBUSY;
+ goto err;
+ }
+
+ /* let other drivers deny the change */
+ ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev->net);
+ ret = notifier_to_errno(ret);
+ if (ret) {
+ netdev_err(dev->net, "Type change was refused\n");
+ goto err;
+ }
+
+ if (enable)
+ info->flags |= QMI_WWAN_FLAG_PASS_THROUGH;
+ else
+ info->flags &= ~QMI_WWAN_FLAG_PASS_THROUGH;
+ qmi_wwan_netdev_setup(dev->net);
+ call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev->net);
+ ret = len;
+err:
+ rtnl_unlock();
+ return ret;
+}
+
static DEVICE_ATTR_RW(raw_ip);
static DEVICE_ATTR_RW(add_mux);
static DEVICE_ATTR_RW(del_mux);
+static DEVICE_ATTR_RW(pass_through);
static struct attribute *qmi_wwan_sysfs_attrs[] = {
&dev_attr_raw_ip.attr,
&dev_attr_add_mux.attr,
&dev_attr_del_mux.attr,
+ &dev_attr_pass_through.attr,
NULL,
};
@@ -479,6 +548,11 @@ static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
if (info->flags & QMI_WWAN_FLAG_MUX)
return qmimux_rx_fixup(dev, skb);
+ if (rawip && (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) {
+ skb->protocol = htons(ETH_P_MAP);
+ return (netif_rx(skb) == NET_RX_SUCCESS);
+ }
+
switch (skb->data[0] & 0xf0) {
case 0x40:
proto = htons(ETH_P_IP);
--
1.9.1
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