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Message-ID: <0d97888a-9eb9-a3a1-f96c-39367dc11a00@intel.com>
Date: Tue, 5 Jun 2018 10:22:13 -0700
From: "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To: Stephen Hemminger <stephen@...workplumber.org>, kys@...rosoft.com,
haiyangz@...rosoft.com, davem@...emloft.net, mst@...hat.com,
Alexander H <alexander.h.duyck@...el.com>,
Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>,
"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: Re: [PATCH net] failover: eliminate callback hell
On 6/4/2018 8:42 PM, Stephen Hemminger wrote:
> The net failover should be a simple library, not a virtual
> object with function callbacks (see callback hell).
> The code is simpler is smaller both for the netvsc and virtio use case.
I quickly tried this patch and it breaks virtio-net in standby mode.
I don't see failover netdev, unloading virtio-net causes a crash.
With these changes, there is very minimal code that is shared between
netvsc and virtio-net. The notifier and event handling code and the
lookup_bymac routines are now duplicated in both the drivers. I thought
we wanted to keep this code common between the 2 drivers and we went through
multiple revisions to make sure that it works with both netvsc's 2 netdev
and virtio-net's 3 netdev models.
The reason for the indirect ops is to support these 2 different models and
i am not sure if the overhead of the callbacks is that significant considering
that they are not called in the hot path.
>
> The code is restructured in many ways. I should have given these
> as review comments to net_failover during review
> but did not want to overwhelm the original submitter.
> Therefore it was merged prematurely.
>
> Some of the many items changed are:
>
> * The support routines should just be selected as needed in
> kernel config, no need for them to be visible config items.
>
> * Both netvsc and net_failover should keep their list of their
> own devices. Not a common list.
>
> * The matching of secondary device to primary device policy
> is up to the network device. Both net_failover and netvsc
> will use MAC for now but can change separately.
>
> * The match policy is only used during initial discovery; after
> that the secondary device knows what the upper device is because
> of the parent/child relationship; no searching is required.
>
> * Now, netvsc and net_failover use the same delayed work type
> mechanism for setup. Previously, net_failover code was triggering off
> name change but a similar policy was rejected for netvsc.
> "what is good for the goose is good for the gander"
>
> * The net_failover private device info 'struct net_failover_info'
> should have been private to the driver file, not a visible
> API.
>
> * The net_failover device should use SET_NETDEV_DEV
> that is intended only for physical devices not virtual devices.
>
> * No point in having DocBook style comments on a driver file.
> They only make sense on an external exposed API.
>
> * net_failover only supports Ethernet, so use ether_addr_copy.
>
> * Set permanent and current address of net_failover device
> to match the primary.
>
> * Carrier should be marked off before registering device
> the net_failover device.
>
> * Use netdev_XXX for log messages, in net_failover (not dev_xxx)
>
> * Since failover infrastructure is about linking devices just
> use RTNL no need for other locking in init and teardown.
>
> * Don't bother with ERR_PTR() style return if only possible
> return is success or no memory.
>
> * As much as possible, the terms master and slave should be avoided
> because of their cultural connotations.
>
> Note; this code has been tested on Hyper-V
> but is compile tested only on virtio.
>
> Fixes: 30c8bd5aa8b2 ("net: Introduce generic failover module")
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
> ---
>
> Although this patch needs to go into 4.18 (linux-net),
> this version is based against net-next because net-next
> hasn't been merged into linux-net yet.
>
>
> drivers/net/hyperv/hyperv_net.h | 3 +-
> drivers/net/hyperv/netvsc_drv.c | 173 +++++++++++------
> drivers/net/net_failover.c | 312 ++++++++++++++++++++-----------
> drivers/net/virtio_net.c | 9 +-
> include/net/failover.h | 31 +---
> include/net/net_failover.h | 32 +---
> net/Kconfig | 13 +-
> net/core/failover.c | 316 ++++----------------------------
> 8 files changed, 373 insertions(+), 516 deletions(-)
>
> diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
> index 99d8e7398a5b..c7d25d10765e 100644
> --- a/drivers/net/hyperv/hyperv_net.h
> +++ b/drivers/net/hyperv/hyperv_net.h
> @@ -902,6 +902,8 @@ struct net_device_context {
> struct hv_device *device_ctx;
> /* netvsc_device */
> struct netvsc_device __rcu *nvdev;
> + /* list of netvsc net_devices */
> + struct list_head list;
> /* reconfigure work */
> struct delayed_work dwork;
> /* last reconfig time */
> @@ -933,7 +935,6 @@ struct net_device_context {
> /* Serial number of the VF to team with */
> u32 vf_serial;
>
> - struct failover *failover;
> };
>
> /* Per channel data */
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index bef4d55a108c..074e6b8578df 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -70,6 +70,8 @@ static int debug = -1;
> module_param(debug, int, 0444);
> MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
>
> +static LIST_HEAD(netvsc_dev_list);
> +
> static void netvsc_change_rx_flags(struct net_device *net, int change)
> {
> struct net_device_context *ndev_ctx = netdev_priv(net);
> @@ -1846,101 +1848,120 @@ static void netvsc_vf_setup(struct work_struct *w)
> }
>
> vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
> - if (vf_netdev)
> + if (vf_netdev) {
> __netvsc_vf_setup(ndev, vf_netdev);
> -
> + dev_put(vf_netdev);
> + }
> rtnl_unlock();
> }
>
> -static int netvsc_pre_register_vf(struct net_device *vf_netdev,
> - struct net_device *ndev)
> +static struct net_device *get_netvsc_bymac(const u8 *mac)
> {
> - struct net_device_context *net_device_ctx;
> - struct netvsc_device *netvsc_dev;
> + struct net_device_context *ndev_ctx;
>
> - net_device_ctx = netdev_priv(ndev);
> - netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
> - if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
> - return -ENODEV;
> + ASSERT_RTNL();
>
> - return 0;
> + list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
> + struct net_device *dev = hv_get_drvdata(ndev_ctx->device_ctx);
> +
> + if (ether_addr_equal(mac, dev->perm_addr))
> + return dev;
> + }
> +
> + return NULL;
> }
>
> -static int netvsc_register_vf(struct net_device *vf_netdev,
> - struct net_device *ndev)
> +static int netvsc_register_vf(struct net_device *vf_netdev)
> {
> - struct net_device_context *ndev_ctx = netdev_priv(ndev);
> + struct net_device *ndev;
> + struct net_device_context *ndev_ctx;
> +
> + /* Must use Ethernet addresses */
> + if (vf_netdev->addr_len != ETH_ALEN)
> + return NOTIFY_DONE;
> +
> + /* VF must be a physical device not VLAN, etc */
> + if (!vf_netdev->dev.parent)
> + return NOTIFY_DONE;
> +
> + /* Use the MAC address to locate the synthetic interface to
> + * associate with the VF interface.
> + */
> + ndev = get_netvsc_bymac(vf_netdev->perm_addr);
> + if (!ndev)
> + return NOTIFY_DONE;
> +
> + /* If network device is being removed, don't do anything */
> + ndev_ctx = netdev_priv(ndev);
> + if (!rtnl_dereference(ndev_ctx->nvdev))
> + return NOTIFY_DONE;
> +
> + if (netdev_failover_join(vf_netdev, ndev, netvsc_vf_handle_frame)) {
> + netdev_err(vf_netdev, "could not join: %s", ndev->name);
> + return NOTIFY_DONE;
> + }
>
> /* set slave flag before open to prevent IPv6 addrconf */
> vf_netdev->flags |= IFF_SLAVE;
>
> + dev_hold(vf_netdev);
> +
> schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
>
> call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
>
> netdev_info(vf_netdev, "joined to %s\n", ndev->name);
>
> - dev_hold(vf_netdev);
> rcu_assign_pointer(ndev_ctx->vf_netdev, vf_netdev);
>
> - return 0;
> + return NOTIFY_OK;
> }
>
> /* VF up/down change detected, schedule to change data path */
> -static int netvsc_vf_changed(struct net_device *vf_netdev,
> - struct net_device *ndev)
> +static int netvsc_vf_changed(struct net_device *vf_netdev)
> {
> struct net_device_context *net_device_ctx;
> struct netvsc_device *netvsc_dev;
> + struct net_device *ndev;
> bool vf_is_up = netif_running(vf_netdev);
>
> + ndev = netdev_failover_upper_get(vf_netdev);
> + if (!ndev)
> + return NOTIFY_DONE;
> +
> net_device_ctx = netdev_priv(ndev);
> netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
> if (!netvsc_dev)
> - return -ENODEV;
> + return NOTIFY_DONE;
>
> netvsc_switch_datapath(ndev, vf_is_up);
> netdev_info(ndev, "Data path switched %s VF: %s\n",
> vf_is_up ? "to" : "from", vf_netdev->name);
>
> - return 0;
> + return NOTIFY_OK;
> }
>
> -static int netvsc_pre_unregister_vf(struct net_device *vf_netdev,
> - struct net_device *ndev)
> +static int netvsc_unregister_vf(struct net_device *vf_netdev)
> {
> struct net_device_context *net_device_ctx;
> + struct net_device *ndev;
>
> - net_device_ctx = netdev_priv(ndev);
> - cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
> -
> - return 0;
> -}
> -
> -static int netvsc_unregister_vf(struct net_device *vf_netdev,
> - struct net_device *ndev)
> -{
> - struct net_device_context *net_device_ctx;
> + ndev = netdev_failover_upper_get(vf_netdev);
> + if (!ndev)
> + return NOTIFY_DONE;
>
> net_device_ctx = netdev_priv(ndev);
> + if (cancel_delayed_work_sync(&net_device_ctx->vf_takeover))
> + dev_put(vf_netdev);
>
> netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
>
> + netdev_failover_unjoin(vf_netdev, ndev);
> RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
> - dev_put(vf_netdev);
>
> - return 0;
> + return NOTIFY_OK;
> }
>
> -static struct failover_ops netvsc_failover_ops = {
> - .slave_pre_register = netvsc_pre_register_vf,
> - .slave_register = netvsc_register_vf,
> - .slave_pre_unregister = netvsc_pre_unregister_vf,
> - .slave_unregister = netvsc_unregister_vf,
> - .slave_link_change = netvsc_vf_changed,
> - .slave_handle_frame = netvsc_vf_handle_frame,
> -};
> -
> static int netvsc_probe(struct hv_device *dev,
> const struct hv_vmbus_device_id *dev_id)
> {
> @@ -2009,6 +2030,8 @@ static int netvsc_probe(struct hv_device *dev,
>
> memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
>
> + net->priv_flags |= IFF_FAILOVER;
> +
> /* hw_features computed in rndis_netdev_set_hwcaps() */
> net->features = net->hw_features |
> NETIF_F_HIGHDMA | NETIF_F_SG |
> @@ -2024,23 +2047,19 @@ static int netvsc_probe(struct hv_device *dev,
> else
> net->max_mtu = ETH_DATA_LEN;
>
> - ret = register_netdev(net);
> + rtnl_lock();
> + ret = register_netdevice(net);
> if (ret != 0) {
> pr_err("Unable to register netdev.\n");
> goto register_failed;
> }
>
> - net_device_ctx->failover = failover_register(net, &netvsc_failover_ops);
> - if (IS_ERR(net_device_ctx->failover)) {
> - ret = PTR_ERR(net_device_ctx->failover);
> - goto err_failover;
> - }
> -
> - return ret;
> + list_add(&net_device_ctx->list, &netvsc_dev_list);
> + rtnl_unlock();
> + return 0;
>
> -err_failover:
> - unregister_netdev(net);
> register_failed:
> + rtnl_unlock();
> rndis_filter_device_remove(dev, nvdev);
> rndis_failed:
> free_percpu(net_device_ctx->vf_stats);
> @@ -2079,15 +2098,17 @@ static int netvsc_remove(struct hv_device *dev)
> */
> rtnl_lock();
> vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
> - if (vf_netdev)
> - failover_slave_unregister(vf_netdev);
> + if (vf_netdev) {
> + netdev_failover_unjoin(vf_netdev, net);
> + dev_put(vf_netdev);
> + }
>
> if (nvdev)
> rndis_filter_device_remove(dev, nvdev);
>
> unregister_netdevice(net);
>
> - failover_unregister(ndev_ctx->failover);
> + list_del(&ndev_ctx->list);
>
> rtnl_unlock();
> rcu_read_unlock();
> @@ -2115,8 +2136,47 @@ static struct hv_driver netvsc_drv = {
> .remove = netvsc_remove,
> };
>
> +/* On Hyper-V, every VF interface is matched with a corresponding
> + * synthetic interface. The synthetic interface is presented first
> + * to the guest. When the corresponding VF instance is registered,
> + * we will take care of switching the data path.
> + */
> +static int netvsc_netdev_event(struct notifier_block *this,
> + unsigned long event, void *ptr)
> +{
> + struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
> +
> + /* Skip parent events */
> + if (netif_is_failover(event_dev))
> + return NOTIFY_DONE;
> +
> + /* Avoid non-Ethernet type devices */
> + if (event_dev->type != ARPHRD_ETHER)
> + return NOTIFY_DONE;
> +
> + switch (event) {
> + case NETDEV_REGISTER:
> + return netvsc_register_vf(event_dev);
> +
> + case NETDEV_UNREGISTER:
> + return netvsc_unregister_vf(event_dev);
> +
> + case NETDEV_UP:
> + case NETDEV_DOWN:
> + return netvsc_vf_changed(event_dev);
> +
> + default:
> + return NOTIFY_DONE;
> + }
> +}
> +
> +static struct notifier_block netvsc_netdev_notifier = {
> + .notifier_call = netvsc_netdev_event,
> +};
> +
> static void __exit netvsc_drv_exit(void)
> {
> + unregister_netdevice_notifier(&netvsc_netdev_notifier);
> vmbus_driver_unregister(&netvsc_drv);
> }
>
> @@ -2136,6 +2196,7 @@ static int __init netvsc_drv_init(void)
> if (ret)
> return ret;
>
> + register_netdevice_notifier(&netvsc_netdev_notifier);
> return 0;
> }
>
> diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
> index 83f7420ddea5..e0d30527f748 100644
> --- a/drivers/net/net_failover.c
> +++ b/drivers/net/net_failover.c
> @@ -28,6 +28,46 @@
> #include <uapi/linux/if_arp.h>
> #include <net/net_failover.h>
>
> +static LIST_HEAD(net_failover_list);
> +
> +/* failover state */
> +struct net_failover_info {
> + struct net_device *failover_dev;
> +
> + /* list of failover virtual devices */
> + struct list_head list;
> +
> + /* primary netdev with same MAC */
> + struct net_device __rcu *primary_dev;
> +
> + /* standby netdev */
> + struct net_device __rcu *standby_dev;
> +
> + /* primary netdev stats */
> + struct rtnl_link_stats64 primary_stats;
> +
> + /* standby netdev stats */
> + struct rtnl_link_stats64 standby_stats;
> +
> + /* aggregated stats */
> + struct rtnl_link_stats64 failover_stats;
> +
> + /* spinlock while updating stats */
> + spinlock_t stats_lock;
> +
> + /* delayed setup of slave */
> + struct delayed_work standby_init;
> +};
> +
> +#define FAILOVER_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
> + NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
> + NETIF_F_HIGHDMA | NETIF_F_LRO)
> +
> +#define FAILOVER_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
> + NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
> +
> +#define FAILOVER_SETUP_INTERVAL (HZ / 10)
> +
> static bool net_failover_xmit_ready(struct net_device *dev)
> {
> return netif_running(dev) && netif_carrier_ok(dev);
> @@ -460,22 +500,42 @@ static void net_failover_lower_state_changed(struct net_device *slave_dev,
> netdev_lower_state_changed(slave_dev, &info);
> }
>
> -static int net_failover_slave_pre_register(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> +static struct net_device *get_net_failover_bymac(const u8 *mac)
> {
> - struct net_device *standby_dev, *primary_dev;
> + struct net_failover_info *nfo_info;
> +
> + ASSERT_RTNL();
> +
> + list_for_each_entry(nfo_info, &net_failover_list, list) {
> + struct net_device *failover_dev = nfo_info->failover_dev;
> +
> + if (ether_addr_equal(mac, failover_dev->perm_addr))
> + return failover_dev;
> + }
> +
> + return NULL;
> +}
> +
> +static int net_failover_register_event(struct net_device *slave_dev)
> +{
> + struct net_device *failover_dev, *standby_dev, *primary_dev;
> struct net_failover_info *nfo_info;
> bool slave_is_standby;
>
> + failover_dev = get_net_failover_bymac(slave_dev->perm_addr);
> + if (!failover_dev)
> + return NOTIFY_DONE;
> +
> nfo_info = netdev_priv(failover_dev);
> standby_dev = rtnl_dereference(nfo_info->standby_dev);
> primary_dev = rtnl_dereference(nfo_info->primary_dev);
> slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
> if (slave_is_standby ? standby_dev : primary_dev) {
> - netdev_err(failover_dev, "%s attempting to register as slave dev when %s already present\n",
> + netdev_err(failover_dev,
> + "%s attempting to register as slave dev when %s already present\n",
> slave_dev->name,
> slave_is_standby ? "standby" : "primary");
> - return -EINVAL;
> + return NOTIFY_DONE;
> }
>
> /* We want to allow only a direct attached VF device as a primary
> @@ -484,23 +544,33 @@ static int net_failover_slave_pre_register(struct net_device *slave_dev,
> */
> if (!slave_is_standby && (!slave_dev->dev.parent ||
> !dev_is_pci(slave_dev->dev.parent)))
> - return -EINVAL;
> + return NOTIFY_DONE;
>
> if (failover_dev->features & NETIF_F_VLAN_CHALLENGED &&
> vlan_uses_dev(failover_dev)) {
> - netdev_err(failover_dev, "Device %s is VLAN challenged and failover device has VLAN set up\n",
> + netdev_err(failover_dev,
> + "Device %s is VLAN challenged and failover device has VLAN set up\n",
> failover_dev->name);
> - return -EINVAL;
> + return NOTIFY_DONE;
> }
>
> - return 0;
> + if (netdev_failover_join(slave_dev, failover_dev,
> + net_failover_handle_frame)) {
> + netdev_err(failover_dev, "could not join: %s", slave_dev->name);
> + return NOTIFY_DONE;
> + }
> +
> + /* Trigger rest of setup in process context */
> + schedule_delayed_work(&nfo_info->standby_init, FAILOVER_SETUP_INTERVAL);
> +
> + return NOTIFY_OK;
> }
>
> -static int net_failover_slave_register(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> +static void __net_failover_setup(struct net_device *failover_dev)
> {
> + struct net_failover_info *nfo_info = netdev_priv(failover_dev);
> + struct net_device *slave_dev = rtnl_dereference(nfo_info->standby_dev);
> struct net_device *standby_dev, *primary_dev;
> - struct net_failover_info *nfo_info;
> bool slave_is_standby;
> u32 orig_mtu;
> int err;
> @@ -509,13 +579,12 @@ static int net_failover_slave_register(struct net_device *slave_dev,
> orig_mtu = slave_dev->mtu;
> err = dev_set_mtu(slave_dev, failover_dev->mtu);
> if (err) {
> - netdev_err(failover_dev, "unable to change mtu of %s to %u register failed\n",
> + netdev_err(failover_dev,
> + "unable to change mtu of %s to %u register failed\n",
> slave_dev->name, failover_dev->mtu);
> goto done;
> }
>
> - dev_hold(slave_dev);
> -
> if (netif_running(failover_dev)) {
> err = dev_open(slave_dev);
> if (err && (err != -EBUSY)) {
> @@ -537,7 +606,6 @@ static int net_failover_slave_register(struct net_device *slave_dev,
> goto err_vlan_add;
> }
>
> - nfo_info = netdev_priv(failover_dev);
> standby_dev = rtnl_dereference(nfo_info->standby_dev);
> primary_dev = rtnl_dereference(nfo_info->primary_dev);
> slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
> @@ -562,52 +630,56 @@ static int net_failover_slave_register(struct net_device *slave_dev,
> netdev_info(failover_dev, "failover %s slave:%s registered\n",
> slave_is_standby ? "standby" : "primary", slave_dev->name);
>
> - return 0;
> + return;
>
> err_vlan_add:
> dev_uc_unsync(slave_dev, failover_dev);
> dev_mc_unsync(slave_dev, failover_dev);
> dev_close(slave_dev);
> err_dev_open:
> - dev_put(slave_dev);
> dev_set_mtu(slave_dev, orig_mtu);
> done:
> - return err;
> + return;
> }
>
> -static int net_failover_slave_pre_unregister(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> +static void net_failover_setup(struct work_struct *w)
> {
> - struct net_device *standby_dev, *primary_dev;
> - struct net_failover_info *nfo_info;
> + struct net_failover_info *nfo_info
> + = container_of(w, struct net_failover_info, standby_init.work);
> + struct net_device *failover_dev = nfo_info->failover_dev;
>
> - nfo_info = netdev_priv(failover_dev);
> - primary_dev = rtnl_dereference(nfo_info->primary_dev);
> - standby_dev = rtnl_dereference(nfo_info->standby_dev);
> -
> - if (slave_dev != primary_dev && slave_dev != standby_dev)
> - return -ENODEV;
> + /* handle race with cancel delayed work on removal */
> + if (!rtnl_trylock()) {
> + schedule_delayed_work(&nfo_info->standby_init, 0);
> + return;
> + }
>
> - return 0;
> + __net_failover_setup(failover_dev);
> + rtnl_unlock();
> }
>
> -static int net_failover_slave_unregister(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> +static int net_failover_unregister_event(struct net_device *slave_dev)
> {
> - struct net_device *standby_dev, *primary_dev;
> + struct net_device *failover_dev, *primary_dev, *standby_dev;
> struct net_failover_info *nfo_info;
> bool slave_is_standby;
>
> + failover_dev = netdev_failover_upper_get(slave_dev);
> + if (!failover_dev)
> + return NOTIFY_DONE;
> +
> nfo_info = netdev_priv(failover_dev);
> primary_dev = rtnl_dereference(nfo_info->primary_dev);
> standby_dev = rtnl_dereference(nfo_info->standby_dev);
>
> + if (slave_dev != primary_dev && slave_dev != standby_dev)
> + return NOTIFY_DONE;
> +
> vlan_vids_del_by_dev(slave_dev, failover_dev);
> dev_uc_unsync(slave_dev, failover_dev);
> dev_mc_unsync(slave_dev, failover_dev);
> dev_close(slave_dev);
>
> - nfo_info = netdev_priv(failover_dev);
> dev_get_stats(failover_dev, &nfo_info->failover_stats);
>
> slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
> @@ -628,22 +700,25 @@ static int net_failover_slave_unregister(struct net_device *slave_dev,
> netdev_info(failover_dev, "failover %s slave:%s unregistered\n",
> slave_is_standby ? "standby" : "primary", slave_dev->name);
>
> - return 0;
> + return NOTIFY_OK;
> }
>
> -static int net_failover_slave_link_change(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> +static int net_failover_link_event(struct net_device *slave_dev)
> +
> {
> - struct net_device *primary_dev, *standby_dev;
> + struct net_device *failover_dev, *primary_dev, *standby_dev;
> struct net_failover_info *nfo_info;
>
> - nfo_info = netdev_priv(failover_dev);
> + failover_dev = netdev_failover_upper_get(slave_dev);
> + if (!failover_dev)
> + return NOTIFY_DONE;
>
> + nfo_info = netdev_priv(failover_dev);
> primary_dev = rtnl_dereference(nfo_info->primary_dev);
> standby_dev = rtnl_dereference(nfo_info->standby_dev);
>
> if (slave_dev != primary_dev && slave_dev != standby_dev)
> - return -ENODEV;
> + return NOTIFY_DONE;
>
> if ((primary_dev && net_failover_xmit_ready(primary_dev)) ||
> (standby_dev && net_failover_xmit_ready(standby_dev))) {
> @@ -657,43 +732,11 @@ static int net_failover_slave_link_change(struct net_device *slave_dev,
>
> net_failover_lower_state_changed(slave_dev, primary_dev, standby_dev);
>
> - return 0;
> + return NOTIFY_DONE;
> }
>
> -static int net_failover_slave_name_change(struct net_device *slave_dev,
> - struct net_device *failover_dev)
> -{
> - struct net_device *primary_dev, *standby_dev;
> - struct net_failover_info *nfo_info;
> -
> - nfo_info = netdev_priv(failover_dev);
> -
> - primary_dev = rtnl_dereference(nfo_info->primary_dev);
> - standby_dev = rtnl_dereference(nfo_info->standby_dev);
> -
> - if (slave_dev != primary_dev && slave_dev != standby_dev)
> - return -ENODEV;
> -
> - /* We need to bring up the slave after the rename by udev in case
> - * open failed with EBUSY when it was registered.
> - */
> - dev_open(slave_dev);
> -
> - return 0;
> -}
> -
> -static struct failover_ops net_failover_ops = {
> - .slave_pre_register = net_failover_slave_pre_register,
> - .slave_register = net_failover_slave_register,
> - .slave_pre_unregister = net_failover_slave_pre_unregister,
> - .slave_unregister = net_failover_slave_unregister,
> - .slave_link_change = net_failover_slave_link_change,
> - .slave_name_change = net_failover_slave_name_change,
> - .slave_handle_frame = net_failover_handle_frame,
> -};
> -
> /**
> - * net_failover_create - Create and register a failover instance
> + * net_failover_create - Create and register a failover device
> *
> * @dev: standby netdev
> *
> @@ -703,13 +746,12 @@ static struct failover_ops net_failover_ops = {
> * the original standby netdev and a VF netdev with the same MAC gets
> * registered as primary netdev.
> *
> - * Return: pointer to failover instance
> + * Return: pointer to failover network device
> */
> -struct failover *net_failover_create(struct net_device *standby_dev)
> +struct net_device *net_failover_create(struct net_device *standby_dev)
> {
> - struct device *dev = standby_dev->dev.parent;
> + struct net_failover_info *nfo_info;
> struct net_device *failover_dev;
> - struct failover *failover;
> int err;
>
> /* Alloc at least 2 queues, for now we are going with 16 assuming
> @@ -717,18 +759,22 @@ struct failover *net_failover_create(struct net_device *standby_dev)
> */
> failover_dev = alloc_etherdev_mq(sizeof(struct net_failover_info), 16);
> if (!failover_dev) {
> - dev_err(dev, "Unable to allocate failover_netdev!\n");
> - return ERR_PTR(-ENOMEM);
> + netdev_err(standby_dev, "Unable to allocate failover_netdev!\n");
> + return NULL;
> }
>
> + nfo_info = netdev_priv(failover_dev);
> dev_net_set(failover_dev, dev_net(standby_dev));
> - SET_NETDEV_DEV(failover_dev, dev);
> + nfo_info->failover_dev = failover_dev;
> + INIT_DELAYED_WORK(&nfo_info->standby_init, net_failover_setup);
>
> failover_dev->netdev_ops = &failover_dev_ops;
> failover_dev->ethtool_ops = &failover_ethtool_ops;
>
> /* Initialize the device options */
> - failover_dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE;
> + failover_dev->priv_flags |= IFF_UNICAST_FLT |
> + IFF_NO_QUEUE |
> + IFF_FAILOVER;
> failover_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE |
> IFF_TX_SKB_SHARING);
>
> @@ -746,29 +792,38 @@ struct failover *net_failover_create(struct net_device *standby_dev)
> failover_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
> failover_dev->features |= failover_dev->hw_features;
>
> - memcpy(failover_dev->dev_addr, standby_dev->dev_addr,
> - failover_dev->addr_len);
> + ether_addr_copy(failover_dev->dev_addr, standby_dev->dev_addr);
> + ether_addr_copy(failover_dev->perm_addr, standby_dev->perm_addr);
>
> failover_dev->min_mtu = standby_dev->min_mtu;
> failover_dev->max_mtu = standby_dev->max_mtu;
>
> - err = register_netdev(failover_dev);
> + netif_carrier_off(failover_dev);
> +
> + rtnl_lock();
> + err = register_netdevice(failover_dev);
> if (err) {
> - dev_err(dev, "Unable to register failover_dev!\n");
> + netdev_err(standby_dev, "Unable to register failover_dev!\n");
> goto err_register_netdev;
> }
>
> - netif_carrier_off(failover_dev);
> + err = netdev_failover_join(standby_dev, failover_dev,
> + net_failover_handle_frame);
> + if (err) {
> + netdev_err(failover_dev, "Unable to join with %s\n",
> + standby_dev->name);
> + goto err_failover_join;
> + }
>
> - failover = failover_register(failover_dev, &net_failover_ops);
> - if (IS_ERR(failover))
> - goto err_failover_register;
> + list_add(&nfo_info->list, &net_failover_list);
> + rtnl_unlock();
>
> - return failover;
> + return failover_dev;
>
> -err_failover_register:
> - unregister_netdev(failover_dev);
> +err_failover_join:
> + unregister_netdevice(failover_dev);
> err_register_netdev:
> + rtnl_unlock();
> free_netdev(failover_dev);
>
> return ERR_PTR(err);
> @@ -786,31 +841,27 @@ EXPORT_SYMBOL_GPL(net_failover_create);
> * netdev. Used by paravirtual drivers that use 3-netdev model.
> *
> */
> -void net_failover_destroy(struct failover *failover)
> +void net_failover_destroy(struct net_device *failover_dev)
> {
> - struct net_failover_info *nfo_info;
> - struct net_device *failover_dev;
> + struct net_failover_info *nfo_info = netdev_priv(failover_dev);
> struct net_device *slave_dev;
>
> - if (!failover)
> - return;
> -
> - failover_dev = rcu_dereference(failover->failover_dev);
> - nfo_info = netdev_priv(failover_dev);
> -
> netif_device_detach(failover_dev);
>
> rtnl_lock();
> -
> slave_dev = rtnl_dereference(nfo_info->primary_dev);
> - if (slave_dev)
> - failover_slave_unregister(slave_dev);
> + if (slave_dev) {
> + netdev_failover_unjoin(slave_dev, failover_dev);
> + dev_put(slave_dev);
> + }
>
> slave_dev = rtnl_dereference(nfo_info->standby_dev);
> - if (slave_dev)
> - failover_slave_unregister(slave_dev);
> + if (slave_dev) {
> + netdev_failover_unjoin(slave_dev, failover_dev);
> + dev_put(slave_dev);
> + }
>
> - failover_unregister(failover);
> + list_del(&nfo_info->list);
>
> unregister_netdevice(failover_dev);
>
> @@ -820,9 +871,53 @@ void net_failover_destroy(struct failover *failover)
> }
> EXPORT_SYMBOL_GPL(net_failover_destroy);
>
> +static int net_failover_event(struct notifier_block *this,
> + unsigned long event, void *ptr)
> +{
> + struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
> +
> + /* Skip parent events */
> + if (netif_is_failover(event_dev))
> + return NOTIFY_DONE;
> +
> + /* Avoid non-Ethernet type devices */
> + if (event_dev->type != ARPHRD_ETHER)
> + return NOTIFY_DONE;
> +
> + /* Avoid Vlan dev with same MAC registering as VF */
> + if (is_vlan_dev(event_dev))
> + return NOTIFY_DONE;
> +
> + /* Avoid Bonding master dev with same MAC registering as VF */
> + if ((event_dev->priv_flags & IFF_BONDING) &&
> + (event_dev->flags & IFF_MASTER))
> + return NOTIFY_DONE;
> +
> + switch (event) {
> + case NETDEV_REGISTER:
> + return net_failover_register_event(event_dev);
> +
> + case NETDEV_UNREGISTER:
> + return net_failover_unregister_event(event_dev);
> +
> + case NETDEV_UP:
> + case NETDEV_DOWN:
> + case NETDEV_CHANGE:
> + return net_failover_link_event(event_dev);
> +
> + default:
> + return NOTIFY_DONE;
> + }
> +}
> +
> +static struct notifier_block net_failover_notifier = {
> + .notifier_call = net_failover_event,
> +};
> +
> static __init int
> net_failover_init(void)
> {
> + register_netdevice_notifier(&net_failover_notifier);
> return 0;
> }
> module_init(net_failover_init);
> @@ -830,6 +925,7 @@ module_init(net_failover_init);
> static __exit
> void net_failover_exit(void)
> {
> + unregister_netdevice_notifier(&net_failover_notifier);
> }
> module_exit(net_failover_exit);
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 6d710b8b41c5..b40ae28dac93 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -215,7 +215,7 @@ struct virtnet_info {
> unsigned long guest_offloads;
>
> /* failover when STANDBY feature enabled */
> - struct failover *failover;
> + struct net_device *failover;
> };
>
> struct padded_vnet_hdr {
> @@ -2930,11 +2930,10 @@ static int virtnet_probe(struct virtio_device *vdev)
> virtnet_init_settings(dev);
>
> if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
> - vi->failover = net_failover_create(vi->dev);
> - if (IS_ERR(vi->failover)) {
> - err = PTR_ERR(vi->failover);
> + err = -ENOMEM;
> + vi->failover = net_failover_create(dev);
> + if (!vi->failover)
> goto free_vqs;
> - }
> }
>
> err = register_netdev(dev);
> diff --git a/include/net/failover.h b/include/net/failover.h
> index bb15438f39c7..22d6c1369101 100644
> --- a/include/net/failover.h
> +++ b/include/net/failover.h
> @@ -6,31 +6,10 @@
>
> #include <linux/netdevice.h>
>
> -struct failover_ops {
> - int (*slave_pre_register)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - int (*slave_register)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - int (*slave_pre_unregister)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - int (*slave_unregister)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - int (*slave_link_change)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - int (*slave_name_change)(struct net_device *slave_dev,
> - struct net_device *failover_dev);
> - rx_handler_result_t (*slave_handle_frame)(struct sk_buff **pskb);
> -};
> -
> -struct failover {
> - struct list_head list;
> - struct net_device __rcu *failover_dev;
> - struct failover_ops __rcu *ops;
> -};
> -
> -struct failover *failover_register(struct net_device *dev,
> - struct failover_ops *ops);
> -void failover_unregister(struct failover *failover);
> -int failover_slave_unregister(struct net_device *slave_dev);
> +int netdev_failover_join(struct net_device *lower, struct net_device *upper,
> + rx_handler_func_t *rx_handler);
> +struct net_device *netdev_failover_upper_get(struct net_device *lower);
> +void netdev_failover_unjoin(struct net_device *lower,
> + struct net_device *upper);
>
> #endif /* _FAILOVER_H */
> diff --git a/include/net/net_failover.h b/include/net/net_failover.h
> index b12a1c469d1c..a99b3b00b4e3 100644
> --- a/include/net/net_failover.h
> +++ b/include/net/net_failover.h
> @@ -6,35 +6,7 @@
>
> #include <net/failover.h>
>
> -/* failover state */
> -struct net_failover_info {
> - /* primary netdev with same MAC */
> - struct net_device __rcu *primary_dev;
> -
> - /* standby netdev */
> - struct net_device __rcu *standby_dev;
> -
> - /* primary netdev stats */
> - struct rtnl_link_stats64 primary_stats;
> -
> - /* standby netdev stats */
> - struct rtnl_link_stats64 standby_stats;
> -
> - /* aggregated stats */
> - struct rtnl_link_stats64 failover_stats;
> -
> - /* spinlock while updating stats */
> - spinlock_t stats_lock;
> -};
> -
> -struct failover *net_failover_create(struct net_device *standby_dev);
> -void net_failover_destroy(struct failover *failover);
> -
> -#define FAILOVER_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
> - NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
> - NETIF_F_HIGHDMA | NETIF_F_LRO)
> -
> -#define FAILOVER_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
> - NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
> +struct net_device *net_failover_create(struct net_device *standby_dev);
> +void net_failover_destroy(struct net_device *failover_dev);
>
> #endif /* _NET_FAILOVER_H */
> diff --git a/net/Kconfig b/net/Kconfig
> index f738a6f27665..697d84202695 100644
> --- a/net/Kconfig
> +++ b/net/Kconfig
> @@ -433,17 +433,8 @@ config PAGE_POOL
> bool
>
> config FAILOVER
> - tristate "Generic failover module"
> - help
> - The failover module provides a generic interface for paravirtual
> - drivers to register a netdev and a set of ops with a failover
> - instance. The ops are used as event handlers that get called to
> - handle netdev register/unregister/link change/name change events
> - on slave pci ethernet devices with the same mac address as the
> - failover netdev. This enables paravirtual drivers to use a
> - VF as an accelerated low latency datapath. It also allows live
> - migration of VMs with direct attached VFs by failing over to the
> - paravirtual datapath when the VF is unplugged.
> + bool
> + default n
>
> endif # if NET
>
> diff --git a/net/core/failover.c b/net/core/failover.c
> index 4a92a98ccce9..499f0fd7e4d3 100644
> --- a/net/core/failover.c
> +++ b/net/core/failover.c
> @@ -1,10 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0
> /* Copyright (c) 2018, Intel Corporation. */
>
> -/* A common module to handle registrations and notifications for paravirtual
> +/* A library for managing chained upper/oower devices such as
> * drivers to enable accelerated datapath and support VF live migration.
> - *
> - * The notifier and event handling code is based on netvsc driver.
> */
>
> #include <linux/module.h>
> @@ -14,302 +12,62 @@
> #include <linux/if_vlan.h>
> #include <net/failover.h>
>
> -static LIST_HEAD(failover_list);
> -static DEFINE_SPINLOCK(failover_lock);
> -
> -static struct net_device *failover_get_bymac(u8 *mac, struct failover_ops **ops)
> -{
> - struct net_device *failover_dev;
> - struct failover *failover;
> -
> - spin_lock(&failover_lock);
> - list_for_each_entry(failover, &failover_list, list) {
> - failover_dev = rtnl_dereference(failover->failover_dev);
> - if (ether_addr_equal(failover_dev->perm_addr, mac)) {
> - *ops = rtnl_dereference(failover->ops);
> - spin_unlock(&failover_lock);
> - return failover_dev;
> - }
> - }
> - spin_unlock(&failover_lock);
> - return NULL;
> -}
> -
> -/**
> - * failover_slave_register - Register a slave netdev
> - *
> - * @slave_dev: slave netdev that is being registered
> - *
> - * Registers a slave device to a failover instance. Only ethernet devices
> - * are supported.
> - */
> -static int failover_slave_register(struct net_device *slave_dev)
> +/* failover_join - Join an lower netdev with an upper device. */
> +int netdev_failover_join(struct net_device *lower_dev,
> + struct net_device *upper_dev,
> + rx_handler_func_t *rx_handler)
> {
> - struct netdev_lag_upper_info lag_upper_info;
> - struct net_device *failover_dev;
> - struct failover_ops *fops;
> int err;
>
> - if (slave_dev->type != ARPHRD_ETHER)
> - goto done;
> -
> ASSERT_RTNL();
>
> - failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
> - if (!failover_dev)
> - goto done;
> + /* Don't allow joining devices of different protocols */
> + if (upper_dev->type != lower_dev->type)
> + return -EINVAL;
>
> - if (fops && fops->slave_pre_register &&
> - fops->slave_pre_register(slave_dev, failover_dev))
> - goto done;
> -
> - err = netdev_rx_handler_register(slave_dev, fops->slave_handle_frame,
> - failover_dev);
> + err = netdev_rx_handler_register(lower_dev, rx_handler, upper_dev);
> if (err) {
> - netdev_err(slave_dev, "can not register failover rx handler (err = %d)\n",
> + netdev_err(lower_dev,
> + "can not register failover rx handler (err = %d)\n",
> err);
> - goto done;
> + return err;
> }
>
> - lag_upper_info.tx_type = NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
> - err = netdev_master_upper_dev_link(slave_dev, failover_dev, NULL,
> - &lag_upper_info, NULL);
> + err = netdev_master_upper_dev_link(lower_dev, upper_dev, NULL,
> + NULL, NULL);
> if (err) {
> - netdev_err(slave_dev, "can not set failover device %s (err = %d)\n",
> - failover_dev->name, err);
> - goto err_upper_link;
> + netdev_err(lower_dev,
> + "can not set failover device %s (err = %d)\n",
> + upper_dev->name, err);
> + netdev_rx_handler_unregister(lower_dev);
> + return err;
> }
>
> - slave_dev->priv_flags |= IFF_FAILOVER_SLAVE;
> -
> - if (fops && fops->slave_register &&
> - !fops->slave_register(slave_dev, failover_dev))
> - return NOTIFY_OK;
> -
> - netdev_upper_dev_unlink(slave_dev, failover_dev);
> - slave_dev->priv_flags &= ~IFF_FAILOVER_SLAVE;
> -err_upper_link:
> - netdev_rx_handler_unregister(slave_dev);
> -done:
> - return NOTIFY_DONE;
> -}
> -
> -/**
> - * failover_slave_unregister - Unregister a slave netdev
> - *
> - * @slave_dev: slave netdev that is being unregistered
> - *
> - * Unregisters a slave device from a failover instance.
> - */
> -int failover_slave_unregister(struct net_device *slave_dev)
> -{
> - struct net_device *failover_dev;
> - struct failover_ops *fops;
> -
> - if (!netif_is_failover_slave(slave_dev))
> - goto done;
> -
> - ASSERT_RTNL();
> -
> - failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
> - if (!failover_dev)
> - goto done;
> -
> - if (fops && fops->slave_pre_unregister &&
> - fops->slave_pre_unregister(slave_dev, failover_dev))
> - goto done;
> -
> - netdev_rx_handler_unregister(slave_dev);
> - netdev_upper_dev_unlink(slave_dev, failover_dev);
> - slave_dev->priv_flags &= ~IFF_FAILOVER_SLAVE;
> -
> - if (fops && fops->slave_unregister &&
> - !fops->slave_unregister(slave_dev, failover_dev))
> - return NOTIFY_OK;
> -
> -done:
> - return NOTIFY_DONE;
> + dev_hold(lower_dev);
> + lower_dev->priv_flags |= IFF_FAILOVER_SLAVE;
> + return 0;
> }
> -EXPORT_SYMBOL_GPL(failover_slave_unregister);
> +EXPORT_SYMBOL_GPL(netdev_failover_join);
>
> -static int failover_slave_link_change(struct net_device *slave_dev)
> +/* Find upper network device for failover slave device */
> +struct net_device *netdev_failover_upper_get(struct net_device *lower_dev)
> {
> - struct net_device *failover_dev;
> - struct failover_ops *fops;
> -
> - if (!netif_is_failover_slave(slave_dev))
> - goto done;
> -
> - ASSERT_RTNL();
> -
> - failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
> - if (!failover_dev)
> - goto done;
> -
> - if (!netif_running(failover_dev))
> - goto done;
> + if (!netif_is_failover_slave(lower_dev))
> + return NULL;
>
> - if (fops && fops->slave_link_change &&
> - !fops->slave_link_change(slave_dev, failover_dev))
> - return NOTIFY_OK;
> -
> -done:
> - return NOTIFY_DONE;
> + return netdev_master_upper_dev_get(lower_dev);
> }
> +EXPORT_SYMBOL_GPL(netdev_failover_upper_get);
>
> -static int failover_slave_name_change(struct net_device *slave_dev)
> +/* failover_unjoin - Break connection between lower and upper device. */
> +void netdev_failover_unjoin(struct net_device *lower_dev,
> + struct net_device *upper_dev)
> {
> - struct net_device *failover_dev;
> - struct failover_ops *fops;
> -
> - if (!netif_is_failover_slave(slave_dev))
> - goto done;
> -
> ASSERT_RTNL();
>
> - failover_dev = failover_get_bymac(slave_dev->perm_addr, &fops);
> - if (!failover_dev)
> - goto done;
> -
> - if (!netif_running(failover_dev))
> - goto done;
> -
> - if (fops && fops->slave_name_change &&
> - !fops->slave_name_change(slave_dev, failover_dev))
> - return NOTIFY_OK;
> -
> -done:
> - return NOTIFY_DONE;
> -}
> -
> -static int
> -failover_event(struct notifier_block *this, unsigned long event, void *ptr)
> -{
> - struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
> -
> - /* Skip parent events */
> - if (netif_is_failover(event_dev))
> - return NOTIFY_DONE;
> -
> - switch (event) {
> - case NETDEV_REGISTER:
> - return failover_slave_register(event_dev);
> - case NETDEV_UNREGISTER:
> - return failover_slave_unregister(event_dev);
> - case NETDEV_UP:
> - case NETDEV_DOWN:
> - case NETDEV_CHANGE:
> - return failover_slave_link_change(event_dev);
> - case NETDEV_CHANGENAME:
> - return failover_slave_name_change(event_dev);
> - default:
> - return NOTIFY_DONE;
> - }
> -}
> -
> -static struct notifier_block failover_notifier = {
> - .notifier_call = failover_event,
> -};
> -
> -static void
> -failover_existing_slave_register(struct net_device *failover_dev)
> -{
> - struct net *net = dev_net(failover_dev);
> - struct net_device *dev;
> -
> - rtnl_lock();
> - for_each_netdev(net, dev) {
> - if (netif_is_failover(dev))
> - continue;
> - if (ether_addr_equal(failover_dev->perm_addr, dev->perm_addr))
> - failover_slave_register(dev);
> - }
> - rtnl_unlock();
> -}
> -
> -/**
> - * failover_register - Register a failover instance
> - *
> - * @dev: failover netdev
> - * @ops: failover ops
> - *
> - * Allocate and register a failover instance for a failover netdev. ops
> - * provides handlers for slave device register/unregister/link change/
> - * name change events.
> - *
> - * Return: pointer to failover instance
> - */
> -struct failover *failover_register(struct net_device *dev,
> - struct failover_ops *ops)
> -{
> - struct failover *failover;
> -
> - if (dev->type != ARPHRD_ETHER)
> - return ERR_PTR(-EINVAL);
> -
> - failover = kzalloc(sizeof(*failover), GFP_KERNEL);
> - if (!failover)
> - return ERR_PTR(-ENOMEM);
> -
> - rcu_assign_pointer(failover->ops, ops);
> - dev_hold(dev);
> - dev->priv_flags |= IFF_FAILOVER;
> - rcu_assign_pointer(failover->failover_dev, dev);
> -
> - spin_lock(&failover_lock);
> - list_add_tail(&failover->list, &failover_list);
> - spin_unlock(&failover_lock);
> -
> - netdev_info(dev, "failover master:%s registered\n", dev->name);
> -
> - failover_existing_slave_register(dev);
> -
> - return failover;
> -}
> -EXPORT_SYMBOL_GPL(failover_register);
> -
> -/**
> - * failover_unregister - Unregister a failover instance
> - *
> - * @failover: pointer to failover instance
> - *
> - * Unregisters and frees a failover instance.
> - */
> -void failover_unregister(struct failover *failover)
> -{
> - struct net_device *failover_dev;
> -
> - failover_dev = rcu_dereference(failover->failover_dev);
> -
> - netdev_info(failover_dev, "failover master:%s unregistered\n",
> - failover_dev->name);
> -
> - failover_dev->priv_flags &= ~IFF_FAILOVER;
> - dev_put(failover_dev);
> -
> - spin_lock(&failover_lock);
> - list_del(&failover->list);
> - spin_unlock(&failover_lock);
> -
> - kfree(failover);
> + netdev_rx_handler_unregister(lower_dev);
> + netdev_upper_dev_unlink(lower_dev, upper_dev);
> + dev_put(lower_dev);
> + lower_dev->priv_flags &= ~IFF_FAILOVER_SLAVE;
> }
> -EXPORT_SYMBOL_GPL(failover_unregister);
> -
> -static __init int
> -failover_init(void)
> -{
> - register_netdevice_notifier(&failover_notifier);
> -
> - return 0;
> -}
> -module_init(failover_init);
> -
> -static __exit
> -void failover_exit(void)
> -{
> - unregister_netdevice_notifier(&failover_notifier);
> -}
> -module_exit(failover_exit);
> -
> -MODULE_DESCRIPTION("Generic failover infrastructure/interface");
> -MODULE_LICENSE("GPL v2");
> +EXPORT_SYMBOL_GPL(netdev_failover_unjoin);
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