Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'"

This reverts commit 77b9c4a438fc66e2ab004c411056b3fb71a54f2c, reversing
changes made to 4515ec4ad58a37e70a9e1256c0b993958c9b7497:

 931420a2fc36 ("selftests/net: Add netkit container tests")
 ab771c938d9a ("selftests/net: Make NetDrvContEnv support queue leasing")
 6be87fbb2776 ("selftests/net: Add env for container based tests")
 61d99ce3dfc2 ("selftests/net: Add bpf skb forwarding program")
 920da3634194 ("netkit: Add xsk support for af_xdp applications")
 eef51113f8af ("netkit: Add netkit notifier to check for unregistering devices")
 b5ef109d22d4 ("netkit: Implement rtnl_link_ops->alloc and ndo_queue_create")
 b5c3fa4a0b16 ("netkit: Add single device mode for netkit")
 0073d2fd679d ("xsk: Proxy pool management for leased queues")
 1ecea95dd3b5 ("xsk: Extend xsk_rcv_check validation")
 804bf334d08a ("net: Proxy netdev_queue_get_dma_dev for leased queues")
 0caa9a8ddec3 ("net: Proxy net_mp_{open,close}_rxq for leased queues")
 ff8889ff9107 ("net, ethtool: Disallow leased real rxqs to be resized")
 9e2103f36110 ("net: Add lease info to queue-get response")
 31127deddef4 ("net: Implement netdev_nl_queue_create_doit")
 a5546e18f77c ("net: Add queue-create operation")

The series will conflict with io_uring work, and the code needs more
polish.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 54 insertions, 306 deletions

diff --git a/drivers/net/netkit.c b/drivers/net/netkit.c
index 0519f855d062..0a2fef7caccb 100644
--- a/drivers/net/netkit.c
+++ b/drivers/net/netkit.c
@@ -9,21 +9,11 @@
 #include <linux/bpf_mprog.h>
 #include <linux/indirect_call_wrapper.h>
 
-#include <net/netdev_lock.h>
-#include <net/netdev_queues.h>
-#include <net/netdev_rx_queue.h>
-#include <net/xdp_sock_drv.h>
 #include <net/netkit.h>
 #include <net/dst.h>
 #include <net/tcx.h>
 
-#define NETKIT_DRV_NAME	"netkit"
-
-#define NETKIT_NUM_RX_QUEUES_MAX  1024
-#define NETKIT_NUM_TX_QUEUES_MAX  1
-
-#define NETKIT_NUM_RX_QUEUES_REAL 1
-#define NETKIT_NUM_TX_QUEUES_REAL 1
+#define DRV_NAME "netkit"
 
 struct netkit {
 	__cacheline_group_begin(netkit_fastpath);
@@ -36,7 +26,6 @@ struct netkit {
 
 	__cacheline_group_begin(netkit_slowpath);
 	enum netkit_mode mode;
-	enum netkit_pairing pair;
 	bool primary;
 	u32 headroom;
 	__cacheline_group_end(netkit_slowpath);
@@ -47,8 +36,6 @@ struct netkit_link {
 	struct net_device *dev;
 };
 
-static struct rtnl_link_ops netkit_link_ops;
-
 static __always_inline int
 netkit_run(const struct bpf_mprog_entry *entry, struct sk_buff *skb,
 	   enum netkit_action ret)
@@ -148,10 +135,6 @@ static int netkit_open(struct net_device *dev)
 	struct netkit *nk = netkit_priv(dev);
 	struct net_device *peer = rtnl_dereference(nk->peer);
 
-	if (nk->pair == NETKIT_DEVICE_SINGLE) {
-		netif_carrier_on(dev);
-		return 0;
-	}
 	if (!peer)
 		return -ENOTCONN;
 	if (peer->flags & IFF_UP) {
@@ -236,86 +219,9 @@ static void netkit_get_stats(struct net_device *dev,
 	stats->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
 }
 
-static bool netkit_xsk_supported_at_phys(const struct net_device *dev)
-{
-	if (!dev->netdev_ops->ndo_bpf ||
-	    !dev->netdev_ops->ndo_xdp_xmit ||
-	    !dev->netdev_ops->ndo_xsk_wakeup)
-		return false;
-	if ((dev->xdp_features & NETDEV_XDP_ACT_XSK) != NETDEV_XDP_ACT_XSK)
-		return false;
-	return true;
-}
-
-static int netkit_xsk(struct net_device *dev, struct netdev_bpf *xdp)
-{
-	struct netkit *nk = netkit_priv(dev);
-	struct netdev_bpf xdp_lower;
-	struct netdev_rx_queue *rxq;
-	struct net_device *phys;
-	int ret = -EBUSY;
-
-	switch (xdp->command) {
-	case XDP_SETUP_XSK_POOL:
-		if (nk->pair == NETKIT_DEVICE_PAIR)
-			return -EOPNOTSUPP;
-		if (xdp->xsk.queue_id >= dev->real_num_rx_queues)
-			return -EINVAL;
-
-		rxq = __netif_get_rx_queue(dev, xdp->xsk.queue_id);
-		if (!rxq->lease)
-			return -EOPNOTSUPP;
-
-		phys = rxq->lease->dev;
-		if (!netkit_xsk_supported_at_phys(phys))
-			return -EOPNOTSUPP;
-
-		memcpy(&xdp_lower, xdp, sizeof(xdp_lower));
-		xdp_lower.xsk.queue_id = get_netdev_rx_queue_index(rxq->lease);
-		break;
-	case XDP_SETUP_PROG:
-		return -EPERM;
-	default:
-		return -EINVAL;
-	}
-
-	netdev_lock(phys);
-	if (!dev_get_min_mp_channel_count(phys))
-		ret = phys->netdev_ops->ndo_bpf(phys, &xdp_lower);
-	netdev_unlock(phys);
-	return ret;
-}
-
-static int netkit_xsk_wakeup(struct net_device *dev, u32 queue_id, u32 flags)
-{
-	struct netdev_rx_queue *rxq;
-	struct net_device *phys;
-
-	if (queue_id >= dev->real_num_rx_queues)
-		return -EINVAL;
-
-	rxq = __netif_get_rx_queue(dev, queue_id);
-	if (!rxq->lease)
-		return -EOPNOTSUPP;
-
-	phys = rxq->lease->dev;
-	if (!netkit_xsk_supported_at_phys(phys))
-		return -EOPNOTSUPP;
-
-	return phys->netdev_ops->ndo_xsk_wakeup(phys,
-			get_netdev_rx_queue_index(rxq->lease), flags);
-}
-
-static int netkit_init(struct net_device *dev)
-{
-	netdev_lockdep_set_classes(dev);
-	return 0;
-}
-
 static void netkit_uninit(struct net_device *dev);
 
 static const struct net_device_ops netkit_netdev_ops = {
-	.ndo_init		= netkit_init,
 	.ndo_open		= netkit_open,
 	.ndo_stop		= netkit_close,
 	.ndo_start_xmit		= netkit_xmit,
@@ -326,95 +232,19 @@ static const struct net_device_ops netkit_netdev_ops = {
 	.ndo_get_peer_dev	= netkit_peer_dev,
 	.ndo_get_stats64	= netkit_get_stats,
 	.ndo_uninit		= netkit_uninit,
-	.ndo_bpf		= netkit_xsk,
-	.ndo_xsk_wakeup		= netkit_xsk_wakeup,
 	.ndo_features_check	= passthru_features_check,
 };
 
 static void netkit_get_drvinfo(struct net_device *dev,
 			       struct ethtool_drvinfo *info)
 {
-	strscpy(info->driver, NETKIT_DRV_NAME, sizeof(info->driver));
+	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
 }
 
 static const struct ethtool_ops netkit_ethtool_ops = {
 	.get_drvinfo		= netkit_get_drvinfo,
 };
 
-static int netkit_queue_create(struct net_device *dev)
-{
-	struct netkit *nk = netkit_priv(dev);
-	u32 rxq_count_old, rxq_count_new;
-	int err;
-
-	rxq_count_old = dev->real_num_rx_queues;
-	rxq_count_new = rxq_count_old + 1;
-
-	/* Only allow to lease a queue in single device mode or to
-	 * lease against the peer device which then ends up in the
-	 * target netns.
-	 */
-	if (nk->pair == NETKIT_DEVICE_PAIR && nk->primary)
-		return -EOPNOTSUPP;
-
-	if (netif_running(dev))
-		netif_carrier_off(dev);
-	err = netif_set_real_num_rx_queues(dev, rxq_count_new);
-	if (netif_running(dev))
-		netif_carrier_on(dev);
-
-	return err ? : rxq_count_old;
-}
-
-static const struct netdev_queue_mgmt_ops netkit_queue_mgmt_ops = {
-	.ndo_queue_create	= netkit_queue_create,
-};
-
-static struct net_device *netkit_alloc(struct nlattr *tb[],
-				       const char *ifname,
-				       unsigned char name_assign_type,
-				       unsigned int num_tx_queues,
-				       unsigned int num_rx_queues)
-{
-	const struct rtnl_link_ops *ops = &netkit_link_ops;
-	struct net_device *dev;
-
-	if (num_tx_queues > NETKIT_NUM_TX_QUEUES_MAX ||
-	    num_rx_queues > NETKIT_NUM_RX_QUEUES_MAX)
-		return ERR_PTR(-EOPNOTSUPP);
-
-	dev = alloc_netdev_mqs(ops->priv_size, ifname,
-			       name_assign_type, ops->setup,
-			       num_tx_queues, num_rx_queues);
-	if (dev) {
-		dev->real_num_tx_queues = NETKIT_NUM_TX_QUEUES_REAL;
-		dev->real_num_rx_queues = NETKIT_NUM_RX_QUEUES_REAL;
-	}
-	return dev;
-}
-
-static void netkit_queue_unlease(struct net_device *dev)
-{
-	struct netdev_rx_queue *rxq, *rxq_lease;
-	struct net_device *dev_lease;
-	int i;
-
-	if (dev->real_num_rx_queues == 1)
-		return;
-
-	netdev_lock(dev);
-	for (i = 1; i < dev->real_num_rx_queues; i++) {
-		rxq = __netif_get_rx_queue(dev, i);
-		rxq_lease = rxq->lease;
-		dev_lease = rxq_lease->dev;
-
-		netdev_lock(dev_lease);
-		netdev_rx_queue_unlease(rxq, rxq_lease);
-		netdev_unlock(dev_lease);
-	}
-	netdev_unlock(dev);
-}
-
 static void netkit_setup(struct net_device *dev)
 {
 	static const netdev_features_t netkit_features_hw_vlan =
@@ -445,20 +275,18 @@ static void netkit_setup(struct net_device *dev)
 	dev->priv_flags |= IFF_DISABLE_NETPOLL;
 	dev->lltx = true;
 
-	dev->netdev_ops     = &netkit_netdev_ops;
-	dev->ethtool_ops    = &netkit_ethtool_ops;
-	dev->queue_mgmt_ops = &netkit_queue_mgmt_ops;
+	dev->ethtool_ops = &netkit_ethtool_ops;
+	dev->netdev_ops  = &netkit_netdev_ops;
 
 	dev->features |= netkit_features;
 	dev->hw_features = netkit_features;
 	dev->hw_enc_features = netkit_features;
 	dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
 	dev->vlan_features = dev->features & ~netkit_features_hw_vlan;
+
 	dev->needs_free_netdev = true;
 
 	netif_set_tso_max_size(dev, GSO_MAX_SIZE);
-
-	xdp_set_features_flag(dev, NETDEV_XDP_ACT_XSK);
 }
 
 static struct net *netkit_get_link_net(const struct net_device *dev)
@@ -497,6 +325,8 @@ static int netkit_validate(struct nlattr *tb[], struct nlattr *data[],
 	return 0;
 }
 
+static struct rtnl_link_ops netkit_link_ops;
+
 static int netkit_new_link(struct net_device *dev,
 			   struct rtnl_newlink_params *params,
 			   struct netlink_ext_ack *extack)
@@ -505,7 +335,6 @@ static int netkit_new_link(struct net_device *dev,
 	enum netkit_scrub scrub_prim = NETKIT_SCRUB_DEFAULT;
 	enum netkit_scrub scrub_peer = NETKIT_SCRUB_DEFAULT;
 	struct nlattr *peer_tb[IFLA_MAX + 1], **tbp, *attr;
-	enum netkit_pairing pair = NETKIT_DEVICE_PAIR;
 	enum netkit_action policy_prim = NETKIT_PASS;
 	enum netkit_action policy_peer = NETKIT_PASS;
 	struct nlattr **data = params->data;
@@ -514,8 +343,7 @@ static int netkit_new_link(struct net_device *dev,
 	struct nlattr **tb = params->tb;
 	u16 headroom = 0, tailroom = 0;
 	struct ifinfomsg *ifmp = NULL;
-	struct net_device *peer = NULL;
-	bool seen_peer = false;
+	struct net_device *peer;
 	char ifname[IFNAMSIZ];
 	struct netkit *nk;
 	int err;
@@ -552,12 +380,6 @@ static int netkit_new_link(struct net_device *dev,
 			headroom = nla_get_u16(data[IFLA_NETKIT_HEADROOM]);
 		if (data[IFLA_NETKIT_TAILROOM])
 			tailroom = nla_get_u16(data[IFLA_NETKIT_TAILROOM]);
-		if (data[IFLA_NETKIT_PAIRING])
-			pair = nla_get_u32(data[IFLA_NETKIT_PAIRING]);
-
-		seen_peer = data[IFLA_NETKIT_PEER_INFO] ||
-			    data[IFLA_NETKIT_PEER_SCRUB] ||
-			    data[IFLA_NETKIT_PEER_POLICY];
 	}
 
 	if (ifmp && tbp[IFLA_IFNAME]) {
@@ -570,46 +392,45 @@ static int netkit_new_link(struct net_device *dev,
 	if (mode != NETKIT_L2 &&
 	    (tb[IFLA_ADDRESS] || tbp[IFLA_ADDRESS]))
 		return -EOPNOTSUPP;
-	if (pair == NETKIT_DEVICE_SINGLE &&
-	    (tb != tbp || seen_peer || policy_prim != NETKIT_PASS))
-		return -EOPNOTSUPP;
 
-	if (pair == NETKIT_DEVICE_PAIR) {
-		peer = rtnl_create_link(peer_net, ifname, ifname_assign_type,
-					&netkit_link_ops, tbp, extack);
-		if (IS_ERR(peer))
-			return PTR_ERR(peer);
-
-		netif_inherit_tso_max(peer, dev);
-		if (headroom)
-			peer->needed_headroom = headroom;
-		if (tailroom)
-			peer->needed_tailroom = tailroom;
-		if (mode == NETKIT_L2 && !(ifmp && tbp[IFLA_ADDRESS]))
-			eth_hw_addr_random(peer);
-		if (ifmp && dev->ifindex)
-			peer->ifindex = ifmp->ifi_index;
+	peer = rtnl_create_link(peer_net, ifname, ifname_assign_type,
+				&netkit_link_ops, tbp, extack);
+	if (IS_ERR(peer))
+		return PTR_ERR(peer);
 
-		nk = netkit_priv(peer);
-		nk->primary = false;
-		nk->policy = policy_peer;
-		nk->scrub = scrub_peer;
-		nk->mode = mode;
-		nk->pair = pair;
-		nk->headroom = headroom;
-		bpf_mprog_bundle_init(&nk->bundle);
-
-		err = register_netdevice(peer);
-		if (err < 0)
-			goto err_register_peer;
-		netif_carrier_off(peer);
-		if (mode == NETKIT_L2)
-			dev_change_flags(peer, peer->flags & ~IFF_NOARP, NULL);
-
-		err = rtnl_configure_link(peer, NULL, 0, NULL);
-		if (err < 0)
-			goto err_configure_peer;
+	netif_inherit_tso_max(peer, dev);
+	if (headroom) {
+		peer->needed_headroom = headroom;
+		dev->needed_headroom = headroom;
 	}
+	if (tailroom) {
+		peer->needed_tailroom = tailroom;
+		dev->needed_tailroom = tailroom;
+	}
+
+	if (mode == NETKIT_L2 && !(ifmp && tbp[IFLA_ADDRESS]))
+		eth_hw_addr_random(peer);
+	if (ifmp && dev->ifindex)
+		peer->ifindex = ifmp->ifi_index;
+
+	nk = netkit_priv(peer);
+	nk->primary = false;
+	nk->policy = policy_peer;
+	nk->scrub = scrub_peer;
+	nk->mode = mode;
+	nk->headroom = headroom;
+	bpf_mprog_bundle_init(&nk->bundle);
+
+	err = register_netdevice(peer);
+	if (err < 0)
+		goto err_register_peer;
+	netif_carrier_off(peer);
+	if (mode == NETKIT_L2)
+		dev_change_flags(peer, peer->flags & ~IFF_NOARP, NULL);
+
+	err = rtnl_configure_link(peer, NULL, 0, NULL);
+	if (err < 0)
+		goto err_configure_peer;
 
 	if (mode == NETKIT_L2 && !tb[IFLA_ADDRESS])
 		eth_hw_addr_random(dev);
@@ -617,17 +438,12 @@ static int netkit_new_link(struct net_device *dev,
 		nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
 	else
 		strscpy(dev->name, "nk%d", IFNAMSIZ);
-	if (headroom)
-		dev->needed_headroom = headroom;
-	if (tailroom)
-		dev->needed_tailroom = tailroom;
 
 	nk = netkit_priv(dev);
 	nk->primary = true;
 	nk->policy = policy_prim;
 	nk->scrub = scrub_prim;
 	nk->mode = mode;
-	nk->pair = pair;
 	nk->headroom = headroom;
 	bpf_mprog_bundle_init(&nk->bundle);
 
@@ -639,12 +455,10 @@ static int netkit_new_link(struct net_device *dev,
 		dev_change_flags(dev, dev->flags & ~IFF_NOARP, NULL);
 
 	rcu_assign_pointer(netkit_priv(dev)->peer, peer);
-	if (peer)
-		rcu_assign_pointer(netkit_priv(peer)->peer, dev);
+	rcu_assign_pointer(netkit_priv(peer)->peer, dev);
 	return 0;
 err_configure_peer:
-	if (peer)
-		unregister_netdevice(peer);
+	unregister_netdevice(peer);
 	return err;
 err_register_peer:
 	free_netdev(peer);
@@ -704,8 +518,6 @@ static struct net_device *netkit_dev_fetch(struct net *net, u32 ifindex, u32 whi
 	nk = netkit_priv(dev);
 	if (!nk->primary)
 		return ERR_PTR(-EACCES);
-	if (nk->pair == NETKIT_DEVICE_SINGLE)
-		return ERR_PTR(-EOPNOTSUPP);
 	if (which == BPF_NETKIT_PEER) {
 		dev = rcu_dereference_rtnl(nk->peer);
 		if (!dev)
@@ -1032,7 +844,6 @@ static void netkit_release_all(struct net_device *dev)
 static void netkit_uninit(struct net_device *dev)
 {
 	netkit_release_all(dev);
-	netkit_queue_unlease(dev);
 }
 
 static void netkit_del_link(struct net_device *dev, struct list_head *head)
@@ -1068,7 +879,6 @@ static int netkit_change_link(struct net_device *dev, struct nlattr *tb[],
 		{ IFLA_NETKIT_PEER_INFO,  "peer info" },
 		{ IFLA_NETKIT_HEADROOM,   "headroom" },
 		{ IFLA_NETKIT_TAILROOM,   "tailroom" },
-		{ IFLA_NETKIT_PAIRING,    "pairing" },
 	};
 
 	if (!nk->primary) {
@@ -1088,11 +898,9 @@ static int netkit_change_link(struct net_device *dev, struct nlattr *tb[],
 	}
 
 	if (data[IFLA_NETKIT_POLICY]) {
-		err = -EOPNOTSUPP;
 		attr = data[IFLA_NETKIT_POLICY];
 		policy = nla_get_u32(attr);
-		if (nk->pair == NETKIT_DEVICE_PAIR)
-			err = netkit_check_policy(policy, attr, extack);
+		err = netkit_check_policy(policy, attr, extack);
 		if (err)
 			return err;
 		WRITE_ONCE(nk->policy, policy);
@@ -1113,48 +921,6 @@ static int netkit_change_link(struct net_device *dev, struct nlattr *tb[],
 	return 0;
 }
 
-static void netkit_check_lease_unregister(struct net_device *dev)
-{
-	LIST_HEAD(list_kill);
-	u32 q_idx;
-
-	if (READ_ONCE(dev->reg_state) != NETREG_UNREGISTERING ||
-	    !dev->dev.parent)
-		return;
-
-	netdev_lock_ops(dev);
-	for (q_idx = 0; q_idx < dev->real_num_rx_queues; q_idx++) {
-		struct net_device *tmp = dev;
-		u32 tmp_q_idx = q_idx;
-
-		if (netif_rx_queue_lease_get_owner(&tmp, &tmp_q_idx)) {
-			if (tmp->netdev_ops != &netkit_netdev_ops)
-				continue;
-			/* A single phys device can have multiple queues leased
-			 * to one netkit device. We can only queue that netkit
-			 * device once to the list_kill. Queues of that phys
-			 * device can be leased with different individual netkit
-			 * devices, hence we batch via list_kill.
-			 */
-			if (unregister_netdevice_queued(tmp))
-				continue;
-			netkit_del_link(tmp, &list_kill);
-		}
-	}
-	netdev_unlock_ops(dev);
-	unregister_netdevice_many(&list_kill);
-}
-
-static int netkit_notifier(struct notifier_block *this,
-			   unsigned long event, void *ptr)
-{
-	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
-
-	if (event == NETDEV_UNREGISTER)
-		netkit_check_lease_unregister(dev);
-	return NOTIFY_DONE;
-}
-
 static size_t netkit_get_size(const struct net_device *dev)
 {
 	return nla_total_size(sizeof(u32)) + /* IFLA_NETKIT_POLICY */
@@ -1165,7 +931,6 @@ static size_t netkit_get_size(const struct net_device *dev)
 	       nla_total_size(sizeof(u8))  + /* IFLA_NETKIT_PRIMARY */
 	       nla_total_size(sizeof(u16)) + /* IFLA_NETKIT_HEADROOM */
 	       nla_total_size(sizeof(u16)) + /* IFLA_NETKIT_TAILROOM */
-	       nla_total_size(sizeof(u32)) + /* IFLA_NETKIT_PAIRING */
 	       0;
 }
 
@@ -1186,8 +951,6 @@ static int netkit_fill_info(struct sk_buff *skb, const struct net_device *dev)
 		return -EMSGSIZE;
 	if (nla_put_u16(skb, IFLA_NETKIT_TAILROOM, dev->needed_tailroom))
 		return -EMSGSIZE;
-	if (nla_put_u32(skb, IFLA_NETKIT_PAIRING, nk->pair))
-		return -EMSGSIZE;
 
 	if (peer) {
 		nk = netkit_priv(peer);
@@ -1209,15 +972,13 @@ static const struct nla_policy netkit_policy[IFLA_NETKIT_MAX + 1] = {
 	[IFLA_NETKIT_TAILROOM]		= { .type = NLA_U16 },
 	[IFLA_NETKIT_SCRUB]		= NLA_POLICY_MAX(NLA_U32, NETKIT_SCRUB_DEFAULT),
 	[IFLA_NETKIT_PEER_SCRUB]	= NLA_POLICY_MAX(NLA_U32, NETKIT_SCRUB_DEFAULT),
-	[IFLA_NETKIT_PAIRING]		= NLA_POLICY_MAX(NLA_U32, NETKIT_DEVICE_SINGLE),
 	[IFLA_NETKIT_PRIMARY]		= { .type = NLA_REJECT,
 					    .reject_message = "Primary attribute is read-only" },
 };
 
 static struct rtnl_link_ops netkit_link_ops = {
-	.kind		= NETKIT_DRV_NAME,
+	.kind		= DRV_NAME,
 	.priv_size	= sizeof(struct netkit),
-	.alloc		= netkit_alloc,
 	.setup		= netkit_setup,
 	.newlink	= netkit_new_link,
 	.dellink	= netkit_del_link,
@@ -1231,39 +992,26 @@ static struct rtnl_link_ops netkit_link_ops = {
 	.maxtype	= IFLA_NETKIT_MAX,
 };
 
-static struct notifier_block netkit_netdev_notifier = {
-	.notifier_call	= netkit_notifier,
-};
-
-static __init int netkit_mod_init(void)
+static __init int netkit_init(void)
 {
-	int ret;
-
 	BUILD_BUG_ON((int)NETKIT_NEXT != (int)TCX_NEXT ||
 		     (int)NETKIT_PASS != (int)TCX_PASS ||
 		     (int)NETKIT_DROP != (int)TCX_DROP ||
 		     (int)NETKIT_REDIRECT != (int)TCX_REDIRECT);
 
-	ret = rtnl_link_register(&netkit_link_ops);
-	if (ret)
-		return ret;
-	ret = register_netdevice_notifier(&netkit_netdev_notifier);
-	if (ret)
-		rtnl_link_unregister(&netkit_link_ops);
-	return ret;
+	return rtnl_link_register(&netkit_link_ops);
 }
 
-static __exit void netkit_mod_exit(void)
+static __exit void netkit_exit(void)
 {
-	unregister_netdevice_notifier(&netkit_netdev_notifier);
 	rtnl_link_unregister(&netkit_link_ops);
 }
 
-module_init(netkit_mod_init);
-module_exit(netkit_mod_exit);
+module_init(netkit_init);
+module_exit(netkit_exit);
 
 MODULE_DESCRIPTION("BPF-programmable network device");
 MODULE_AUTHOR("Daniel Borkmann <daniel@iogearbox.net>");
 MODULE_AUTHOR("Nikolay Aleksandrov <razor@blackwall.org>");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS_RTNL_LINK(NETKIT_DRV_NAME);
+MODULE_ALIAS_RTNL_LINK(DRV_NAME);