netvsc: refactor notifier/event handling code to use the failover framework
Use the registration/notification framework supported by the generic failover infrastructure. Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sridhar Samudrala
David S. Miller
parent
30c8bd5aa8
commit
1ff78076d8
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@ -2,5 +2,6 @@ config HYPERV_NET
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tristate "Microsoft Hyper-V virtual network driver"
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depends on HYPERV
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select UCS2_STRING
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select FAILOVER
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help
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Select this option to enable the Hyper-V virtual network driver.
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@ -932,6 +932,8 @@ struct net_device_context {
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u32 vf_alloc;
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/* Serial number of the VF to team with */
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u32 vf_serial;
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struct failover *failover;
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};
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/* Per channel data */
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@ -43,6 +43,7 @@
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#include <net/pkt_sched.h>
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#include <net/checksum.h>
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#include <net/ip6_checksum.h>
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#include <net/failover.h>
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#include "hyperv_net.h"
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@ -1779,46 +1780,6 @@ static void netvsc_link_change(struct work_struct *w)
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rtnl_unlock();
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}
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static struct net_device *get_netvsc_bymac(const u8 *mac)
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{
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struct net_device *dev;
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ASSERT_RTNL();
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for_each_netdev(&init_net, dev) {
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if (dev->netdev_ops != &device_ops)
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continue; /* not a netvsc device */
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if (ether_addr_equal(mac, dev->perm_addr))
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return dev;
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}
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return NULL;
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}
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static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
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{
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struct net_device *dev;
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ASSERT_RTNL();
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for_each_netdev(&init_net, dev) {
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struct net_device_context *net_device_ctx;
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if (dev->netdev_ops != &device_ops)
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continue; /* not a netvsc device */
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net_device_ctx = netdev_priv(dev);
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if (!rtnl_dereference(net_device_ctx->nvdev))
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continue; /* device is removed */
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if (rtnl_dereference(net_device_ctx->vf_netdev) == vf_netdev)
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return dev; /* a match */
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}
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return NULL;
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}
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/* Called when VF is injecting data into network stack.
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* Change the associated network device from VF to netvsc.
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* note: already called with rcu_read_lock
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@ -1841,46 +1802,6 @@ static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
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return RX_HANDLER_ANOTHER;
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}
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static int netvsc_vf_join(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device_context *ndev_ctx = netdev_priv(ndev);
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int ret;
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ret = netdev_rx_handler_register(vf_netdev,
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netvsc_vf_handle_frame, ndev);
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if (ret != 0) {
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netdev_err(vf_netdev,
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"can not register netvsc VF receive handler (err = %d)\n",
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ret);
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goto rx_handler_failed;
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}
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ret = netdev_master_upper_dev_link(vf_netdev, ndev,
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NULL, NULL, NULL);
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if (ret != 0) {
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netdev_err(vf_netdev,
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"can not set master device %s (err = %d)\n",
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ndev->name, ret);
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goto upper_link_failed;
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}
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/* set slave flag before open to prevent IPv6 addrconf */
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vf_netdev->flags |= IFF_SLAVE;
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schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
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call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
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netdev_info(vf_netdev, "joined to %s\n", ndev->name);
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return 0;
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upper_link_failed:
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netdev_rx_handler_unregister(vf_netdev);
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rx_handler_failed:
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return ret;
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}
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static void __netvsc_vf_setup(struct net_device *ndev,
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struct net_device *vf_netdev)
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{
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@ -1931,85 +1852,95 @@ static void netvsc_vf_setup(struct work_struct *w)
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rtnl_unlock();
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}
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static int netvsc_register_vf(struct net_device *vf_netdev)
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static int netvsc_pre_register_vf(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device *ndev;
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struct net_device_context *net_device_ctx;
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struct netvsc_device *netvsc_dev;
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if (vf_netdev->addr_len != ETH_ALEN)
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return NOTIFY_DONE;
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/*
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* We will use the MAC address to locate the synthetic interface to
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* associate with the VF interface. If we don't find a matching
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* synthetic interface, move on.
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*/
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ndev = get_netvsc_bymac(vf_netdev->perm_addr);
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if (!ndev)
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return NOTIFY_DONE;
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net_device_ctx = netdev_priv(ndev);
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netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
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if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
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return NOTIFY_DONE;
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return -ENODEV;
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if (netvsc_vf_join(vf_netdev, ndev) != 0)
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return NOTIFY_DONE;
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return 0;
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}
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netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
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static int netvsc_register_vf(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device_context *ndev_ctx = netdev_priv(ndev);
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/* set slave flag before open to prevent IPv6 addrconf */
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vf_netdev->flags |= IFF_SLAVE;
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schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
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call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
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netdev_info(vf_netdev, "joined to %s\n", ndev->name);
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dev_hold(vf_netdev);
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rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
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return NOTIFY_OK;
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rcu_assign_pointer(ndev_ctx->vf_netdev, vf_netdev);
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return 0;
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}
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/* VF up/down change detected, schedule to change data path */
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static int netvsc_vf_changed(struct net_device *vf_netdev)
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static int netvsc_vf_changed(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device_context *net_device_ctx;
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struct netvsc_device *netvsc_dev;
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struct net_device *ndev;
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bool vf_is_up = netif_running(vf_netdev);
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ndev = get_netvsc_byref(vf_netdev);
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if (!ndev)
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return NOTIFY_DONE;
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net_device_ctx = netdev_priv(ndev);
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netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
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if (!netvsc_dev)
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return NOTIFY_DONE;
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return -ENODEV;
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netvsc_switch_datapath(ndev, vf_is_up);
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netdev_info(ndev, "Data path switched %s VF: %s\n",
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vf_is_up ? "to" : "from", vf_netdev->name);
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return NOTIFY_OK;
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return 0;
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}
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static int netvsc_unregister_vf(struct net_device *vf_netdev)
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static int netvsc_pre_unregister_vf(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device *ndev;
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struct net_device_context *net_device_ctx;
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ndev = get_netvsc_byref(vf_netdev);
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if (!ndev)
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return NOTIFY_DONE;
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net_device_ctx = netdev_priv(ndev);
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cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
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return 0;
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}
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static int netvsc_unregister_vf(struct net_device *vf_netdev,
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struct net_device *ndev)
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{
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struct net_device_context *net_device_ctx;
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net_device_ctx = netdev_priv(ndev);
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netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
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netdev_rx_handler_unregister(vf_netdev);
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netdev_upper_dev_unlink(vf_netdev, ndev);
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RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
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dev_put(vf_netdev);
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return NOTIFY_OK;
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return 0;
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}
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static struct failover_ops netvsc_failover_ops = {
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.slave_pre_register = netvsc_pre_register_vf,
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.slave_register = netvsc_register_vf,
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.slave_pre_unregister = netvsc_pre_unregister_vf,
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.slave_unregister = netvsc_unregister_vf,
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.slave_link_change = netvsc_vf_changed,
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.slave_handle_frame = netvsc_vf_handle_frame,
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};
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static int netvsc_probe(struct hv_device *dev,
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const struct hv_vmbus_device_id *dev_id)
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{
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@ -2099,8 +2030,14 @@ static int netvsc_probe(struct hv_device *dev,
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goto register_failed;
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}
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net_device_ctx->failover = failover_register(net, &netvsc_failover_ops);
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if (IS_ERR(net_device_ctx->failover))
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goto err_failover;
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return ret;
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err_failover:
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unregister_netdev(net);
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register_failed:
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rndis_filter_device_remove(dev, nvdev);
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rndis_failed:
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@ -2141,13 +2078,15 @@ static int netvsc_remove(struct hv_device *dev)
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rtnl_lock();
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vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
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if (vf_netdev)
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netvsc_unregister_vf(vf_netdev);
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failover_slave_unregister(vf_netdev);
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if (nvdev)
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rndis_filter_device_remove(dev, nvdev);
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unregister_netdevice(net);
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failover_unregister(ndev_ctx->failover);
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rtnl_unlock();
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rcu_read_unlock();
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@ -2174,54 +2113,8 @@ static struct hv_driver netvsc_drv = {
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.remove = netvsc_remove,
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};
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/*
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* On Hyper-V, every VF interface is matched with a corresponding
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* synthetic interface. The synthetic interface is presented first
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* to the guest. When the corresponding VF instance is registered,
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* we will take care of switching the data path.
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*/
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static int netvsc_netdev_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
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/* Skip our own events */
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if (event_dev->netdev_ops == &device_ops)
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return NOTIFY_DONE;
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/* Avoid non-Ethernet type devices */
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if (event_dev->type != ARPHRD_ETHER)
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return NOTIFY_DONE;
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/* Avoid Vlan dev with same MAC registering as VF */
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if (is_vlan_dev(event_dev))
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return NOTIFY_DONE;
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/* Avoid Bonding master dev with same MAC registering as VF */
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if ((event_dev->priv_flags & IFF_BONDING) &&
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(event_dev->flags & IFF_MASTER))
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return NOTIFY_DONE;
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switch (event) {
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case NETDEV_REGISTER:
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return netvsc_register_vf(event_dev);
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case NETDEV_UNREGISTER:
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return netvsc_unregister_vf(event_dev);
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case NETDEV_UP:
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case NETDEV_DOWN:
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return netvsc_vf_changed(event_dev);
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default:
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return NOTIFY_DONE;
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}
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}
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static struct notifier_block netvsc_netdev_notifier = {
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.notifier_call = netvsc_netdev_event,
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};
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static void __exit netvsc_drv_exit(void)
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{
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unregister_netdevice_notifier(&netvsc_netdev_notifier);
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vmbus_driver_unregister(&netvsc_drv);
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}
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@ -2241,7 +2134,6 @@ static int __init netvsc_drv_init(void)
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if (ret)
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return ret;
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register_netdevice_notifier(&netvsc_netdev_notifier);
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return 0;
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}
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