netdev: network device operations infrastructure

This patch changes the network device internal API to move adminstrative
operations out of the network device structure and into a separate structure.

This patch involves some hackery to maintain compatablity between the
new and old model, so all 300+ drivers don't have to be changed at once.
For drivers that aren't converted yet, the netdevice_ops virt function list
still resides in the net_device structure. For old protocols, the new
net_device_ops are copied out to the old net_device pointers.

After the transistion is completed the nag message can be changed to
an WARN_ON, and the compatiablity code can be made configurable.

Some function pointers aren't moved:
* destructor can't be in net_device_ops because
  it may need to be referenced after the module is unloaded.
* neighbor setup is manipulated in a couple of places that need special
  consideration
* hard_start_xmit is in the fast path for transmit.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 86 insertions, 39 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index e08c0fcd603b..ca14ab407b33 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1059,6 +1059,7 @@ void dev_load(struct net *net, const char *name)
  */
 int dev_open(struct net_device *dev)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
         int ret = 0;
 
         ASSERT_RTNL();
@@ -1081,11 +1082,11 @@ int dev_open(struct net_device *dev)
          */
         set_bit(__LINK_STATE_START, &dev->state);
 
-        if (dev->validate_addr)
-                ret = dev->validate_addr(dev);
+        if (ops->ndo_validate_addr)
+                ret = ops->ndo_validate_addr(dev);
 
-        if (!ret && dev->open)
-                ret = dev->open(dev);
+        if (!ret && ops->ndo_open)
+                ret = ops->ndo_open(dev);
 
         /*
          *      If it went open OK then:
@@ -1129,6 +1130,7 @@ int dev_open(struct net_device *dev)
  */
 int dev_close(struct net_device *dev)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
         ASSERT_RTNL();
 
         might_sleep();
@@ -1161,8 +1163,8 @@ int dev_close(struct net_device *dev)
          *      We allow it to be called even after a DETACH hot-plug
          *      event.
          */
-        if (dev->stop)
-                dev->stop(dev);
+        if (ops->ndo_stop)
+                ops->ndo_stop(dev);
 
         /*
          *      Device is now down.
@@ -2930,8 +2932,10 @@ int netdev_set_master(struct net_device *slave, struct net_device *master)
 
 static void dev_change_rx_flags(struct net_device *dev, int flags)
 {
-        if (dev->flags & IFF_UP && dev->change_rx_flags)
-                dev->change_rx_flags(dev, flags);
+        const struct net_device_ops *ops = dev->netdev_ops;
+
+        if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
+                ops->ndo_change_rx_flags(dev, flags);
 }
 
 static int __dev_set_promiscuity(struct net_device *dev, int inc)
@@ -3051,6 +3055,8 @@ int dev_set_allmulti(struct net_device *dev, int inc)
  */
 void __dev_set_rx_mode(struct net_device *dev)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
+
         /* dev_open will call this function so the list will stay sane. */
         if (!(dev->flags&IFF_UP))
                 return;
@@ -3058,8 +3064,8 @@ void __dev_set_rx_mode(struct net_device *dev)
         if (!netif_device_present(dev))
                 return;
 
-        if (dev->set_rx_mode)
-                dev->set_rx_mode(dev);
+        if (ops->ndo_set_rx_mode)
+                ops->ndo_set_rx_mode(dev);
         else {
                 /* Unicast addresses changes may only happen under the rtnl,
                  * therefore calling __dev_set_promiscuity here is safe.
@@ -3072,8 +3078,8 @@ void __dev_set_rx_mode(struct net_device *dev)
                         dev->uc_promisc = 0;
                 }
 
-                if (dev->set_multicast_list)
-                        dev->set_multicast_list(dev);
+                if (ops->ndo_set_multicast_list)
+                        ops->ndo_set_multicast_list(dev);
         }
 }
 
@@ -3432,6 +3438,7 @@ int dev_change_flags(struct net_device *dev, unsigned flags)
  */
 int dev_set_mtu(struct net_device *dev, int new_mtu)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
         int err;
 
         if (new_mtu == dev->mtu)
@@ -3445,10 +3452,11 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
                 return -ENODEV;
 
         err = 0;
-        if (dev->change_mtu)
-                err = dev->change_mtu(dev, new_mtu);
+        if (ops->ndo_change_mtu)
+                err = ops->ndo_change_mtu(dev, new_mtu);
         else
                 dev->mtu = new_mtu;
+
         if (!err && dev->flags & IFF_UP)
                 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
         return err;
@@ -3463,15 +3471,16 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
  */
 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
         int err;
 
-        if (!dev->set_mac_address)
+        if (!ops->ndo_set_mac_address)
                 return -EOPNOTSUPP;
         if (sa->sa_family != dev->type)
                 return -EINVAL;
         if (!netif_device_present(dev))
                 return -ENODEV;
-        err = dev->set_mac_address(dev, sa);
+        err = ops->ndo_set_mac_address(dev, sa);
         if (!err)
                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
         return err;
@@ -3551,6 +3560,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
 {
         int err;
         struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+        const struct net_device_ops *ops = dev->netdev_ops;
 
         if (!dev)
                 return -ENODEV;
@@ -3578,15 +3588,15 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
                         return 0;
 
                 case SIOCSIFMAP:
-                        if (dev->set_config) {
+                        if (ops->ndo_set_config) {
                                 if (!netif_device_present(dev))
                                         return -ENODEV;
-                                return dev->set_config(dev, &ifr->ifr_map);
+                                return ops->ndo_set_config(dev, &ifr->ifr_map);
                         }
                         return -EOPNOTSUPP;
 
                 case SIOCADDMULTI:
-                        if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+                        if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
                             ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
                                 return -EINVAL;
                         if (!netif_device_present(dev))
@@ -3595,7 +3605,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
                                           dev->addr_len, 1);
 
                 case SIOCDELMULTI:
-                        if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+                        if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
                             ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
                                 return -EINVAL;
                         if (!netif_device_present(dev))
@@ -3633,10 +3643,9 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
                             cmd == SIOCBRDELIF ||
                             cmd == SIOCWANDEV) {
                                 err = -EOPNOTSUPP;
-                                if (dev->do_ioctl) {
+                                if (ops->ndo_do_ioctl) {
                                         if (netif_device_present(dev))
-                                                err = dev->do_ioctl(dev, ifr,
-                                                                    cmd);
+                                                err = ops->ndo_do_ioctl(dev, ifr, cmd);
                                         else
                                                 err = -ENODEV;
                                 }
@@ -3897,8 +3906,8 @@ static void rollback_registered(struct net_device *dev)
          */
         dev_addr_discard(dev);
 
-        if (dev->uninit)
-                dev->uninit(dev);
+        if (dev->netdev_ops->ndo_uninit)
+                dev->netdev_ops->ndo_uninit(dev);
 
         /* Notifier chain MUST detach us from master device. */
         WARN_ON(dev->master);
@@ -3988,7 +3997,7 @@ int register_netdevice(struct net_device *dev)
         struct hlist_head *head;
         struct hlist_node *p;
         int ret;
-        struct net *net;
+        struct net *net = dev_net(dev);
 
         BUG_ON(dev_boot_phase);
         ASSERT_RTNL();
@@ -3997,8 +4006,7 @@ int register_netdevice(struct net_device *dev)
 
         /* When net_device's are persistent, this will be fatal. */
         BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
-        BUG_ON(!dev_net(dev));
-        net = dev_net(dev);
+        BUG_ON(!net);
 
         spin_lock_init(&dev->addr_list_lock);
         netdev_set_addr_lockdep_class(dev);
@@ -4006,9 +4014,46 @@ int register_netdevice(struct net_device *dev)
 
         dev->iflink = -1;
 
+#ifdef CONFIG_COMPAT_NET_DEV_OPS
+        /* Netdevice_ops API compatiability support.
+         * This is temporary until all network devices are converted.
+         */
+        if (dev->netdev_ops) {
+                const struct net_device_ops *ops = dev->netdev_ops;
+
+                dev->init = ops->ndo_init;
+                dev->uninit = ops->ndo_uninit;
+                dev->open = ops->ndo_open;
+                dev->change_rx_flags = ops->ndo_change_rx_flags;
+                dev->set_rx_mode = ops->ndo_set_rx_mode;
+                dev->set_multicast_list = ops->ndo_set_multicast_list;
+                dev->set_mac_address = ops->ndo_set_mac_address;
+                dev->validate_addr = ops->ndo_validate_addr;
+                dev->do_ioctl = ops->ndo_do_ioctl;
+                dev->set_config = ops->ndo_set_config;
+                dev->change_mtu = ops->ndo_change_mtu;
+                dev->tx_timeout = ops->ndo_tx_timeout;
+                dev->get_stats = ops->ndo_get_stats;
+                dev->vlan_rx_register = ops->ndo_vlan_rx_register;
+                dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
+                dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+                dev->poll_controller = ops->ndo_poll_controller;
+#endif
+        } else {
+                char drivername[64];
+                pr_info("%s (%s): not using net_device_ops yet\n",
+                        dev->name, netdev_drivername(dev, drivername, 64));
+
+                /* This works only because net_device_ops and the
+                   compatiablity structure are the same. */
+                dev->netdev_ops = (void *) &(dev->init);
+        }
+#endif
+
         /* Init, if this function is available */
-        if (dev->init) {
-                ret = dev->init(dev);
+        if (dev->netdev_ops->ndo_init) {
+                ret = dev->netdev_ops->ndo_init(dev);
                 if (ret) {
                         if (ret > 0)
                                 ret = -EIO;
@@ -4086,8 +4131,8 @@ out:
         return ret;
 
 err_uninit:
-        if (dev->uninit)
-                dev->uninit(dev);
+        if (dev->netdev_ops->ndo_uninit)
+                dev->netdev_ops->ndo_uninit(dev);
         goto out;
 }
 
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index fc4e28e23b89..630df6034444 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -172,12 +172,13 @@ static void service_arp_queue(struct netpoll_info *npi)
 void netpoll_poll(struct netpoll *np)
 {
         struct net_device *dev = np->dev;
+        const struct net_device_ops *ops = dev->netdev_ops;
 
-        if (!dev || !netif_running(dev) || !dev->poll_controller)
+        if (!dev || !netif_running(dev) || !ops->ndo_poll_controller)
                 return;
 
         /* Process pending work on NIC */
-        dev->poll_controller(dev);
+        ops->ndo_poll_controller(dev);
 
         poll_napi(dev);
 
@@ -694,7 +695,7 @@ int netpoll_setup(struct netpoll *np)
                 atomic_inc(&npinfo->refcnt);
         }
 
-        if (!ndev->poll_controller) {
+        if (!ndev->netdev_ops->ndo_poll_controller) {
                 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
                        np->name, np->dev_name);
                 err = -ENOTSUPP;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4dfb6b4d4559..6f8e0778e565 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -762,6 +762,7 @@ static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                       struct nlattr **tb, char *ifname, int modified)
 {
+        const struct net_device_ops *ops = dev->netdev_ops;
         int send_addr_notify = 0;
         int err;
 
@@ -783,7 +784,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                 struct rtnl_link_ifmap *u_map;
                 struct ifmap k_map;
 
-                if (!dev->set_config) {
+                if (!ops->ndo_set_config) {
                         err = -EOPNOTSUPP;
                         goto errout;
                 }
@@ -801,7 +802,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                 k_map.dma = (unsigned char) u_map->dma;
                 k_map.port = (unsigned char) u_map->port;
 
-                err = dev->set_config(dev, &k_map);
+                err = ops->ndo_set_config(dev, &k_map);
                 if (err < 0)
                         goto errout;
 
@@ -812,7 +813,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                 struct sockaddr *sa;
                 int len;
 
-                if (!dev->set_mac_address) {
+                if (!ops->ndo_set_mac_address) {
                         err = -EOPNOTSUPP;
                         goto errout;
                 }
@@ -831,7 +832,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
                 sa->sa_family = dev->type;
                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
                        dev->addr_len);
-                err = dev->set_mac_address(dev, sa);
+                err = ops->ndo_set_mac_address(dev, sa);
                 kfree(sa);
                 if (err)
                         goto errout;