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authorSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>2021-01-25 00:33:35 -0700
committerJakub Kicinski <kuba@kernel.org>2021-01-28 18:01:29 -0800
commit59e139cf0b32a7a08ef20453927ecd57db086d8e (patch)
tree955c5b55b4a05802ebaf90713650b99cbdfa4daf /drivers/net/usb
parentbbe25b7d694846e8946e7aea6ac9d342a4e43345 (diff)
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. Pass through mode can be enabled when the device is in raw ip mode only. Conversely, raw ip mode cannot be disabled when pass through mode is enabled. Userspace can use pass through mode in conjunction with rmnet driver through the following steps- 1. Enable raw ip mode on qmi_wwan device 2. Enable pass through mode on qmi_wwan device 3. Create a rmnet device with qmi_wwan device as real device using netlink Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Acked-by: Bjørn Mork <bjorn@mork.no> Link: https://lore.kernel.org/r/1611560015-20034-1-git-send-email-subashab@codeaurora.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/usb')
-rw-r--r--drivers/net/usb/qmi_wwan.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 29568ea8a9f2..c8b2b60d2183 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -57,6 +57,7 @@ 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 {
@@ -350,6 +351,13 @@ static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, co
if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP))
return len;
+ /* ip mode cannot be cleared when pass through mode is set */
+ if (!enable && (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) {
+ netdev_err(dev->net,
+ "Cannot clear ip mode on pass through device\n");
+ return -EINVAL;
+ }
+
if (!rtnl_trylock())
return restart_syscall();
@@ -480,14 +488,59 @@ err:
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;
+
+ 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 (enable)
+ info->flags |= QMI_WWAN_FLAG_PASS_THROUGH;
+ else
+ info->flags &= ~QMI_WWAN_FLAG_PASS_THROUGH;
+
+ return len;
+}
+
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,
};
@@ -534,6 +587,11 @@ 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 (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);