net: mhi_net: Register wwan_ops for link creation

Register wwan_ops for link management via wwan rtnetlink. This is
only basic support for now, since we only support creating one
single link (link-0), but is useful to validate new wwan rtnetlink
interface.

For backward compatibity support, we still register a default netdev
at probe time, except if 'create_default_iface' module parameter is
set to false.

This has been tested with iproute2 and mbimcli:
$ ip link add dev wwan0-0 parentdev-name wwan0 type wwan linkid 0
$ mbimcli -p -d /dev/wwan0p2MBIM --connect apn=free
$ ip link set dev wwan0-0 up
$ ip addr add dev wwan0 ${IP}
$ ip route replace default via ${IP}
$ ping 8.8.8.8
...

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 4da68ba..30d6e2f 100644 (file)
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -431,6 +431,7 @@ config VSOCKMON
 config MHI_NET
        tristate "MHI network driver"
        depends on MHI_BUS
+       select WWAN_CORE
        help
          This is the network driver for MHI bus.  It can be used with
          QCOM based WWAN modems (like SDX55).  Say Y or M.

diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
index 0d8293a..64af1e5 100644 (file)
--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c
@@ -11,6 +11,7 @@
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/u64_stats_sync.h>
+#include <linux/wwan.h>
 
 #include "mhi.h"
 
@@ -18,6 +19,12 @@
 #define MHI_NET_MAX_MTU                0xffff
 #define MHI_NET_DEFAULT_MTU    0x4000
 
+/* When set to false, the default netdev (link 0) is not created, and it's up
+ * to user to create the link (via wwan rtnetlink).
+ */
+static bool create_default_iface = true;
+module_param(create_default_iface, bool, 0);
+
 struct mhi_device_info {
        const char *netname;
        const struct mhi_net_proto *proto;
@@ -295,32 +302,33 @@ static void mhi_net_rx_refill_work(struct work_struct *work)
                schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2);
 }
 
-static struct device_type wwan_type = {
-       .name = "wwan",
-};
-
-static int mhi_net_probe(struct mhi_device *mhi_dev,
-                        const struct mhi_device_id *id)
+static int mhi_net_newlink(void *ctxt, struct net_device *ndev, u32 if_id,
+                          struct netlink_ext_ack *extack)
 {
-       const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data;
-       struct device *dev = &mhi_dev->dev;
+       const struct mhi_device_info *info;
+       struct mhi_device *mhi_dev = ctxt;
        struct mhi_net_dev *mhi_netdev;
-       struct net_device *ndev;
        int err;
 
-       ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname,
-                           NET_NAME_PREDICTABLE, mhi_net_setup);
-       if (!ndev)
-               return -ENOMEM;
+       info = (struct mhi_device_info *)mhi_dev->id->driver_data;
+
+       /* For now we only support one link (link context 0), driver must be
+        * reworked to break 1:1 relationship for net MBIM and to forward setup
+        * call to rmnet(QMAP) otherwise.
+        */
+       if (if_id != 0)
+               return -EINVAL;
+
+       if (dev_get_drvdata(&mhi_dev->dev))
+               return -EBUSY;
 
        mhi_netdev = netdev_priv(ndev);
-       dev_set_drvdata(dev, mhi_netdev);
+
+       dev_set_drvdata(&mhi_dev->dev, mhi_netdev);
        mhi_netdev->ndev = ndev;
        mhi_netdev->mdev = mhi_dev;
        mhi_netdev->skbagg_head = NULL;
        mhi_netdev->proto = info->proto;
-       SET_NETDEV_DEV(ndev, &mhi_dev->dev);
-       SET_NETDEV_DEVTYPE(ndev, &wwan_type);
 
        INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work);
        u64_stats_init(&mhi_netdev->stats.rx_syncp);
@@ -334,7 +342,10 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
        /* Number of transfer descriptors determines size of the queue */
        mhi_netdev->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
 
-       err = register_netdev(ndev);
+       if (extack)
+               err = register_netdevice(ndev);
+       else
+               err = register_netdev(ndev);
        if (err)
                goto out_err;
 
@@ -347,23 +358,89 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
        return 0;
 
 out_err_proto:
-       unregister_netdev(ndev);
+       unregister_netdevice(ndev);
 out_err:
        free_netdev(ndev);
        return err;
 }
 
-static void mhi_net_remove(struct mhi_device *mhi_dev)
+static void mhi_net_dellink(void *ctxt, struct net_device *ndev,
+                           struct list_head *head)
 {
-       struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
+       struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
+       struct mhi_device *mhi_dev = ctxt;
 
-       unregister_netdev(mhi_netdev->ndev);
+       if (head)
+               unregister_netdevice_queue(ndev, head);
+       else
+               unregister_netdev(ndev);
 
-       mhi_unprepare_from_transfer(mhi_netdev->mdev);
+       mhi_unprepare_from_transfer(mhi_dev);
 
        kfree_skb(mhi_netdev->skbagg_head);
 
-       free_netdev(mhi_netdev->ndev);
+       dev_set_drvdata(&mhi_dev->dev, NULL);
+}
+
+const struct wwan_ops mhi_wwan_ops = {
+       .owner = THIS_MODULE,
+       .priv_size = sizeof(struct mhi_net_dev),
+       .setup = mhi_net_setup,
+       .newlink = mhi_net_newlink,
+       .dellink = mhi_net_dellink,
+};
+
+static int mhi_net_probe(struct mhi_device *mhi_dev,
+                        const struct mhi_device_id *id)
+{
+       const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data;
+       struct mhi_controller *cntrl = mhi_dev->mhi_cntrl;
+       struct net_device *ndev;
+       int err;
+
+       err = wwan_register_ops(&cntrl->mhi_dev->dev, &mhi_wwan_ops, mhi_dev);
+       if (err)
+               return err;
+
+       if (!create_default_iface)
+               return 0;
+
+       /* Create a default interface which is used as either RMNET real-dev,
+        * MBIM link 0 or ip link 0)
+        */
+       ndev = alloc_netdev(sizeof(struct mhi_net_dev), info->netname,
+                           NET_NAME_PREDICTABLE, mhi_net_setup);
+       if (!ndev) {
+               err = -ENOMEM;
+               goto err_unregister;
+       }
+
+       SET_NETDEV_DEV(ndev, &mhi_dev->dev);
+
+       err = mhi_net_newlink(mhi_dev, ndev, 0, NULL);
+       if (err)
+               goto err_release;
+
+       return 0;
+
+err_release:
+       free_netdev(ndev);
+err_unregister:
+       wwan_unregister_ops(&cntrl->mhi_dev->dev);
+
+       return err;
+}
+
+static void mhi_net_remove(struct mhi_device *mhi_dev)
+{
+       struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
+       struct mhi_controller *cntrl = mhi_dev->mhi_cntrl;
+
+       /* rtnetlink takes care of removing remaining links */
+       wwan_unregister_ops(&cntrl->mhi_dev->dev);
+
+       if (create_default_iface)
+               mhi_net_dellink(mhi_dev, mhi_netdev->ndev, NULL);
 }
 
 static const struct mhi_device_info mhi_hwip0 = {