Merge branch 'nfp-more-set-actions-and-notifier-refactor'

Jakub Kicinski says:

====================
nfp: more set actions and notifier refactor

This series brings updates to flower offload code.  First Pieter adds
support for setting TTL, ToS, Flow Label and Hop Limit fields in IPv4
and IPv6 headers.

Remaining 5 patches deal with factoring out netdev notifiers from flower
code.  We already have two instances, and more is coming, so it's time
to move to one central notifier which then feeds individual feature
handlers.

I start that part by cleaning up the existing notifiers.  Next a central
notifier is added, and used by flower offloads.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/action.c

@@ -384,10 +384,21 @@ nfp_fl_set_eth(const struct tc_action *action, int idx, u32 off,
 	return 0;
 }
 
+struct ipv4_ttl_word {
+	__u8	ttl;
+	__u8	protocol;
+	__sum16	check;
+};
+
 static int
 nfp_fl_set_ip4(const struct tc_action *action, int idx, u32 off,
-	       struct nfp_fl_set_ip4_addrs *set_ip_addr)
+	       struct nfp_fl_set_ip4_addrs *set_ip_addr,
+	       struct nfp_fl_set_ip4_ttl_tos *set_ip_ttl_tos)
 {
+	struct ipv4_ttl_word *ttl_word_mask;
+	struct ipv4_ttl_word *ttl_word;
+	struct iphdr *tos_word_mask;
+	struct iphdr *tos_word;
 	__be32 exact, mask;
 
 	/* We are expecting tcf_pedit to return a big endian value */
@@ -402,20 +413,53 @@ nfp_fl_set_ip4(const struct tc_action *action, int idx, u32 off,
 		set_ip_addr->ipv4_dst_mask |= mask;
 		set_ip_addr->ipv4_dst &= ~mask;
 		set_ip_addr->ipv4_dst |= exact & mask;
+		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
+		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
+					   NFP_FL_LW_SIZ;
 		break;
 	case offsetof(struct iphdr, saddr):
 		set_ip_addr->ipv4_src_mask |= mask;
 		set_ip_addr->ipv4_src &= ~mask;
 		set_ip_addr->ipv4_src |= exact & mask;
+		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
+		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
+					   NFP_FL_LW_SIZ;
+		break;
+	case offsetof(struct iphdr, ttl):
+		ttl_word_mask = (struct ipv4_ttl_word *)&mask;
+		ttl_word = (struct ipv4_ttl_word *)&exact;
+
+		if (ttl_word_mask->protocol || ttl_word_mask->check)
+			return -EOPNOTSUPP;
+
+		set_ip_ttl_tos->ipv4_ttl_mask |= ttl_word_mask->ttl;
+		set_ip_ttl_tos->ipv4_ttl &= ~ttl_word_mask->ttl;
+		set_ip_ttl_tos->ipv4_ttl |= ttl_word->ttl & ttl_word_mask->ttl;
+		set_ip_ttl_tos->head.jump_id =
+			NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS;
+		set_ip_ttl_tos->head.len_lw = sizeof(*set_ip_ttl_tos) >>
+					      NFP_FL_LW_SIZ;
+		break;
+	case round_down(offsetof(struct iphdr, tos), 4):
+		tos_word_mask = (struct iphdr *)&mask;
+		tos_word = (struct iphdr *)&exact;
+
+		if (tos_word_mask->version || tos_word_mask->ihl ||
+		    tos_word_mask->tot_len)
+			return -EOPNOTSUPP;
+
+		set_ip_ttl_tos->ipv4_tos_mask |= tos_word_mask->tos;
+		set_ip_ttl_tos->ipv4_tos &= ~tos_word_mask->tos;
+		set_ip_ttl_tos->ipv4_tos |= tos_word->tos & tos_word_mask->tos;
+		set_ip_ttl_tos->head.jump_id =
+			NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS;
+		set_ip_ttl_tos->head.len_lw = sizeof(*set_ip_ttl_tos) >>
+					      NFP_FL_LW_SIZ;
 		break;
 	default:
 		return -EOPNOTSUPP;
 	}
 
-	set_ip_addr->reserved = cpu_to_be16(0);
-	set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
-	set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >> NFP_FL_LW_SIZ;
-
 	return 0;
 }
 
@@ -432,12 +476,57 @@ nfp_fl_set_ip6_helper(int opcode_tag, u8 word, __be32 exact, __be32 mask,
 	ip6->head.len_lw = sizeof(*ip6) >> NFP_FL_LW_SIZ;
 }
 
+struct ipv6_hop_limit_word {
+	__be16 payload_len;
+	u8 nexthdr;
+	u8 hop_limit;
+};
+
+static int
+nfp_fl_set_ip6_hop_limit_flow_label(u32 off, __be32 exact, __be32 mask,
+				    struct nfp_fl_set_ipv6_tc_hl_fl *ip_hl_fl)
+{
+	struct ipv6_hop_limit_word *fl_hl_mask;
+	struct ipv6_hop_limit_word *fl_hl;
+
+	switch (off) {
+	case offsetof(struct ipv6hdr, payload_len):
+		fl_hl_mask = (struct ipv6_hop_limit_word *)&mask;
+		fl_hl = (struct ipv6_hop_limit_word *)&exact;
+
+		if (fl_hl_mask->nexthdr || fl_hl_mask->payload_len)
+			return -EOPNOTSUPP;
+
+		ip_hl_fl->ipv6_hop_limit_mask |= fl_hl_mask->hop_limit;
+		ip_hl_fl->ipv6_hop_limit &= ~fl_hl_mask->hop_limit;
+		ip_hl_fl->ipv6_hop_limit |= fl_hl->hop_limit &
+					    fl_hl_mask->hop_limit;
+		break;
+	case round_down(offsetof(struct ipv6hdr, flow_lbl), 4):
+		if (mask & ~IPV6_FLOW_LABEL_MASK ||
+		    exact & ~IPV6_FLOW_LABEL_MASK)
+			return -EOPNOTSUPP;
+
+		ip_hl_fl->ipv6_label_mask |= mask;
+		ip_hl_fl->ipv6_label &= ~mask;
+		ip_hl_fl->ipv6_label |= exact & mask;
+		break;
+	}
+
+	ip_hl_fl->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL;
+	ip_hl_fl->head.len_lw = sizeof(*ip_hl_fl) >> NFP_FL_LW_SIZ;
+
+	return 0;
+}
+
 static int
 nfp_fl_set_ip6(const struct tc_action *action, int idx, u32 off,
 	       struct nfp_fl_set_ipv6_addr *ip_dst,
-	       struct nfp_fl_set_ipv6_addr *ip_src)
+	       struct nfp_fl_set_ipv6_addr *ip_src,
+	       struct nfp_fl_set_ipv6_tc_hl_fl *ip_hl_fl)
 {
 	__be32 exact, mask;
+	int err = 0;
 	u8 word;
 
 	/* We are expecting tcf_pedit to return a big endian value */
@@ -448,7 +537,8 @@ nfp_fl_set_ip6(const struct tc_action *action, int idx, u32 off,
 		return -EOPNOTSUPP;
 
 	if (off < offsetof(struct ipv6hdr, saddr)) {
-		return -EOPNOTSUPP;
+		err = nfp_fl_set_ip6_hop_limit_flow_label(off, exact, mask,
+							  ip_hl_fl);
 	} else if (off < offsetof(struct ipv6hdr, daddr)) {
 		word = (off - offsetof(struct ipv6hdr, saddr)) / sizeof(exact);
 		nfp_fl_set_ip6_helper(NFP_FL_ACTION_OPCODE_SET_IPV6_SRC, word,
@@ -462,7 +552,7 @@ nfp_fl_set_ip6(const struct tc_action *action, int idx, u32 off,
 		return -EOPNOTSUPP;
 	}
 
-	return 0;
+	return err;
 }
 
 static int
@@ -513,6 +603,8 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 	     char *nfp_action, int *a_len, u32 *csum_updated)
 {
 	struct nfp_fl_set_ipv6_addr set_ip6_dst, set_ip6_src;
+	struct nfp_fl_set_ipv6_tc_hl_fl set_ip6_tc_hl_fl;
+	struct nfp_fl_set_ip4_ttl_tos set_ip_ttl_tos;
 	struct nfp_fl_set_ip4_addrs set_ip_addr;
 	struct nfp_fl_set_tport set_tport;
 	struct nfp_fl_set_eth set_eth;
@@ -522,6 +614,8 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 	u32 offset, cmd;
 	u8 ip_proto = 0;
 
+	memset(&set_ip6_tc_hl_fl, 0, sizeof(set_ip6_tc_hl_fl));
+	memset(&set_ip_ttl_tos, 0, sizeof(set_ip_ttl_tos));
 	memset(&set_ip6_dst, 0, sizeof(set_ip6_dst));
 	memset(&set_ip6_src, 0, sizeof(set_ip6_src));
 	memset(&set_ip_addr, 0, sizeof(set_ip_addr));
@@ -542,11 +636,12 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 			err = nfp_fl_set_eth(action, idx, offset, &set_eth);
 			break;
 		case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
-			err = nfp_fl_set_ip4(action, idx, offset, &set_ip_addr);
+			err = nfp_fl_set_ip4(action, idx, offset, &set_ip_addr,
+					     &set_ip_ttl_tos);
 			break;
 		case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
 			err = nfp_fl_set_ip6(action, idx, offset, &set_ip6_dst,
-					     &set_ip6_src);
+					     &set_ip6_src, &set_ip6_tc_hl_fl);
 			break;
 		case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
 			err = nfp_fl_set_tport(action, idx, offset, &set_tport,
@@ -577,6 +672,16 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 		memcpy(nfp_action, &set_eth, act_size);
 		*a_len += act_size;
 	}
+	if (set_ip_ttl_tos.head.len_lw) {
+		nfp_action += act_size;
+		act_size = sizeof(set_ip_ttl_tos);
+		memcpy(nfp_action, &set_ip_ttl_tos, act_size);
+		*a_len += act_size;
+
+		/* Hardware will automatically fix IPv4 and TCP/UDP checksum. */
+		*csum_updated |= TCA_CSUM_UPDATE_FLAG_IPV4HDR |
+				nfp_fl_csum_l4_to_flag(ip_proto);
+	}
 	if (set_ip_addr.head.len_lw) {
 		nfp_action += act_size;
 		act_size = sizeof(set_ip_addr);
@@ -587,6 +692,15 @@ nfp_fl_pedit(const struct tc_action *action, struct tc_cls_flower_offload *flow,
 		*csum_updated |= TCA_CSUM_UPDATE_FLAG_IPV4HDR |
 				nfp_fl_csum_l4_to_flag(ip_proto);
 	}
+	if (set_ip6_tc_hl_fl.head.len_lw) {
+		nfp_action += act_size;
+		act_size = sizeof(set_ip6_tc_hl_fl);
+		memcpy(nfp_action, &set_ip6_tc_hl_fl, act_size);
+		*a_len += act_size;
+
+		/* Hardware will automatically fix TCP/UDP checksum. */
+		*csum_updated |= nfp_fl_csum_l4_to_flag(ip_proto);
+	}
 	if (set_ip6_dst.head.len_lw && set_ip6_src.head.len_lw) {
 		/* TC compiles set src and dst IPv6 address as a single action,
 		 * the hardware requires this to be 2 separate actions.

drivers/net/ethernet/netronome/nfp/flower/cmsg.h

@@ -65,8 +65,10 @@
 #define NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL	6
 #define NFP_FL_ACTION_OPCODE_SET_ETHERNET	7
 #define NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS	9
+#define NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS	10
 #define NFP_FL_ACTION_OPCODE_SET_IPV6_SRC	11
 #define NFP_FL_ACTION_OPCODE_SET_IPV6_DST	12
+#define NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL	13
 #define NFP_FL_ACTION_OPCODE_SET_UDP		14
 #define NFP_FL_ACTION_OPCODE_SET_TCP		15
 #define NFP_FL_ACTION_OPCODE_PRE_LAG		16
@@ -82,6 +84,8 @@
 #define NFP_FL_PUSH_VLAN_CFI		BIT(12)
 #define NFP_FL_PUSH_VLAN_VID		GENMASK(11, 0)
 
+#define IPV6_FLOW_LABEL_MASK		cpu_to_be32(0x000fffff)
+
 /* LAG ports */
 #define NFP_FL_LAG_OUT			0xC0DE0000
 
@@ -125,6 +129,26 @@ struct nfp_fl_set_ip4_addrs {
 	__be32 ipv4_dst;
 };
 
+struct nfp_fl_set_ip4_ttl_tos {
+	struct nfp_fl_act_head head;
+	u8 ipv4_ttl_mask;
+	u8 ipv4_tos_mask;
+	u8 ipv4_ttl;
+	u8 ipv4_tos;
+	__be16 reserved;
+};
+
+struct nfp_fl_set_ipv6_tc_hl_fl {
+	struct nfp_fl_act_head head;
+	u8 ipv6_tc_mask;
+	u8 ipv6_hop_limit_mask;
+	__be16 reserved;
+	u8 ipv6_tc;
+	u8 ipv6_hop_limit;
+	__be32 ipv6_label_mask;
+	__be32 ipv6_label;
+};
+
 struct nfp_fl_set_ipv6_addr {
 	struct nfp_fl_act_head head;
 	__be16 reserved;

drivers/net/ethernet/netronome/nfp/flower/lag_conf.c

@@ -472,17 +472,25 @@ nfp_fl_lag_schedule_group_remove(struct nfp_fl_lag *lag,
 	schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
 }
 
-static int
+static void
 nfp_fl_lag_schedule_group_delete(struct nfp_fl_lag *lag,
 				 struct net_device *master)
 {
 	struct nfp_fl_lag_group *group;
+	struct nfp_flower_priv *priv;
+
+	priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
+
+	if (!netif_is_bond_master(master))
+		return;
 
 	mutex_lock(&lag->lock);
 	group = nfp_fl_lag_find_group_for_master_with_lag(lag, master);
 	if (!group) {
 		mutex_unlock(&lag->lock);
-		return -ENOENT;
+		nfp_warn(priv->app->cpp, "untracked bond got unregistered %s\n",
+			 netdev_name(master));
+		return;
 	}
 
 	group->to_remove = true;
@@ -490,7 +498,6 @@ nfp_fl_lag_schedule_group_delete(struct nfp_fl_lag *lag,
 	mutex_unlock(&lag->lock);
 
 	schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
-	return 0;
 }
 
 static int
@@ -575,7 +582,7 @@ nfp_fl_lag_changeupper_event(struct nfp_fl_lag *lag,
 	return 0;
 }
 
-static int
+static void
 nfp_fl_lag_changels_event(struct nfp_fl_lag *lag, struct net_device *netdev,
 			  struct netdev_notifier_changelowerstate_info *info)
 {
@@ -586,18 +593,18 @@ nfp_fl_lag_changels_event(struct nfp_fl_lag *lag, struct net_device *netdev,
 	unsigned long *flags;
 
 	if (!netif_is_lag_port(netdev) || !nfp_netdev_is_nfp_repr(netdev))
-		return 0;
+		return;
 
 	lag_lower_info = info->lower_state_info;
 	if (!lag_lower_info)
-		return 0;
+		return;
 
 	priv = container_of(lag, struct nfp_flower_priv, nfp_lag);
 	repr = netdev_priv(netdev);
 
 	/* Verify that the repr is associated with this app. */
 	if (repr->app != priv->app)
-		return 0;
+		return;
 
 	repr_priv = repr->app_priv;
 	flags = &repr_priv->lag_port_flags;
@@ -617,20 +624,15 @@ nfp_fl_lag_changels_event(struct nfp_fl_lag *lag, struct net_device *netdev,
 	mutex_unlock(&lag->lock);
 
 	schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
-	return 0;
 }
 
-static int
-nfp_fl_lag_netdev_event(struct notifier_block *nb, unsigned long event,
-			void *ptr)
+int nfp_flower_lag_netdev_event(struct nfp_flower_priv *priv,
+				struct net_device *netdev,
+				unsigned long event, void *ptr)
 {
-	struct net_device *netdev;
-	struct nfp_fl_lag *lag;
+	struct nfp_fl_lag *lag = &priv->nfp_lag;
 	int err;
 
-	netdev = netdev_notifier_info_to_dev(ptr);
-	lag = container_of(nb, struct nfp_fl_lag, lag_nb);
-
 	switch (event) {
 	case NETDEV_CHANGEUPPER:
 		err = nfp_fl_lag_changeupper_event(lag, ptr);
@@ -638,17 +640,11 @@ nfp_fl_lag_netdev_event(struct notifier_block *nb, unsigned long event,
 			return NOTIFY_BAD;
 		return NOTIFY_OK;
 	case NETDEV_CHANGELOWERSTATE:
-		err = nfp_fl_lag_changels_event(lag, netdev, ptr);
-		if (err)
-			return NOTIFY_BAD;
+		nfp_fl_lag_changels_event(lag, netdev, ptr);
 		return NOTIFY_OK;
 	case NETDEV_UNREGISTER:
-		if (netif_is_bond_master(netdev)) {
-			err = nfp_fl_lag_schedule_group_delete(lag, netdev);
-			if (err)
-				return NOTIFY_BAD;
-			return NOTIFY_OK;
-		}
+		nfp_fl_lag_schedule_group_delete(lag, netdev);
+		return NOTIFY_OK;
 	}
 
 	return NOTIFY_DONE;
@@ -673,8 +669,6 @@ void nfp_flower_lag_init(struct nfp_fl_lag *lag)
 
 	/* 0 is a reserved batch version so increment to first valid value. */
 	nfp_fl_increment_version(lag);
-
-	lag->lag_nb.notifier_call = nfp_fl_lag_netdev_event;
 }
 
 void nfp_flower_lag_cleanup(struct nfp_fl_lag *lag)

drivers/net/ethernet/netronome/nfp/flower/main.c

@@ -661,23 +661,30 @@ static int nfp_flower_start(struct nfp_app *app)
 		err = nfp_flower_lag_reset(&app_priv->nfp_lag);
 		if (err)
 			return err;
-
-		err = register_netdevice_notifier(&app_priv->nfp_lag.lag_nb);
-		if (err)
-			return err;
 	}
 
 	return nfp_tunnel_config_start(app);
 }
 
 static void nfp_flower_stop(struct nfp_app *app)
+{
+	nfp_tunnel_config_stop(app);
+}
+
+static int
+nfp_flower_netdev_event(struct nfp_app *app, struct net_device *netdev,
+			unsigned long event, void *ptr)
 {
 	struct nfp_flower_priv *app_priv = app->priv;
+	int ret;
 
-	if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG)
-		unregister_netdevice_notifier(&app_priv->nfp_lag.lag_nb);
+	if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
+		ret = nfp_flower_lag_netdev_event(app_priv, netdev, event, ptr);
+		if (ret & NOTIFY_STOP_MASK)
+			return ret;
+	}
 
-	nfp_tunnel_config_stop(app);
+	return nfp_tunnel_mac_event_handler(app, netdev, event, ptr);
 }
 
 const struct nfp_app_type app_flower = {
@@ -708,6 +715,8 @@ const struct nfp_app_type app_flower = {
 	.start		= nfp_flower_start,
 	.stop		= nfp_flower_stop,
 
+	.netdev_event	= nfp_flower_netdev_event,
+
 	.ctrl_msg_rx	= nfp_flower_cmsg_rx,
 
 	.sriov_enable	= nfp_flower_sriov_enable,

drivers/net/ethernet/netronome/nfp/flower/main.h

@@ -72,7 +72,6 @@ struct nfp_mtu_conf {
 
 /**
  * struct nfp_fl_lag - Flower APP priv data for link aggregation
- * @lag_nb:		Notifier to track master/slave events
  * @work:		Work queue for writing configs to the HW
  * @lock:		Lock to protect lag_group_list
  * @group_list:		List of all master/slave groups offloaded
@@ -85,7 +84,6 @@ struct nfp_mtu_conf {
  *			retransmission
  */
 struct nfp_fl_lag {
-	struct notifier_block lag_nb;
 	struct delayed_work work;
 	struct mutex lock;
 	struct list_head group_list;
@@ -126,7 +124,6 @@ struct nfp_fl_lag {
  * @nfp_neigh_off_lock:	Lock for the neighbour address list
  * @nfp_mac_off_ids:	IDA to manage id assignment for offloaded macs
  * @nfp_mac_off_count:	Number of MACs in address list
- * @nfp_tun_mac_nb:	Notifier to monitor link state
  * @nfp_tun_neigh_nb:	Notifier to monitor neighbour state
  * @reify_replies:	atomically stores the number of replies received
  *			from firmware for repr reify
@@ -160,7 +157,6 @@ struct nfp_flower_priv {
 	spinlock_t nfp_neigh_off_lock;
 	struct ida nfp_mac_off_ids;
 	int nfp_mac_off_count;
-	struct notifier_block nfp_tun_mac_nb;
 	struct notifier_block nfp_tun_neigh_nb;
 	atomic_t reify_replies;
 	wait_queue_head_t reify_wait_queue;
@@ -252,6 +248,9 @@ void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb);
 
 int nfp_tunnel_config_start(struct nfp_app *app);
 void nfp_tunnel_config_stop(struct nfp_app *app);
+int nfp_tunnel_mac_event_handler(struct nfp_app *app,
+				 struct net_device *netdev,
+				 unsigned long event, void *ptr);
 void nfp_tunnel_write_macs(struct nfp_app *app);
 void nfp_tunnel_del_ipv4_off(struct nfp_app *app, __be32 ipv4);
 void nfp_tunnel_add_ipv4_off(struct nfp_app *app, __be32 ipv4);
@@ -262,6 +261,9 @@ int nfp_flower_setup_tc_egress_cb(enum tc_setup_type type, void *type_data,
 void nfp_flower_lag_init(struct nfp_fl_lag *lag);
 void nfp_flower_lag_cleanup(struct nfp_fl_lag *lag);
 int nfp_flower_lag_reset(struct nfp_fl_lag *lag);
+int nfp_flower_lag_netdev_event(struct nfp_flower_priv *priv,
+				struct net_device *netdev,
+				unsigned long event, void *ptr);
 bool nfp_flower_lag_unprocessed_msg(struct nfp_app *app, struct sk_buff *skb);
 int nfp_flower_lag_populate_pre_action(struct nfp_app *app,
 				       struct net_device *master,

drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c

@@ -652,29 +652,16 @@ static void nfp_tun_add_to_mac_offload_list(struct net_device *netdev,
 	mutex_unlock(&priv->nfp_mac_off_lock);
 }
 
-static int nfp_tun_mac_event_handler(struct notifier_block *nb,
-				     unsigned long event, void *ptr)
+int nfp_tunnel_mac_event_handler(struct nfp_app *app,
+				 struct net_device *netdev,
+				 unsigned long event, void *ptr)
 {
-	struct nfp_flower_priv *app_priv;
-	struct net_device *netdev;
-	struct nfp_app *app;
-
 	if (event == NETDEV_DOWN || event == NETDEV_UNREGISTER) {
-		app_priv = container_of(nb, struct nfp_flower_priv,
-					nfp_tun_mac_nb);
-		app = app_priv->app;
-		netdev = netdev_notifier_info_to_dev(ptr);
-
 		/* If non-nfp netdev then free its offload index. */
 		if (nfp_tun_is_netdev_to_offload(netdev))
 			nfp_tun_del_mac_idx(app, netdev->ifindex);
 	} else if (event == NETDEV_UP || event == NETDEV_CHANGEADDR ||
 		   event == NETDEV_REGISTER) {
-		app_priv = container_of(nb, struct nfp_flower_priv,
-					nfp_tun_mac_nb);
-		app = app_priv->app;
-		netdev = netdev_notifier_info_to_dev(ptr);
-
 		nfp_tun_add_to_mac_offload_list(netdev, app);
 
 		/* Force a list write to keep NFP up to date. */
@@ -686,14 +673,11 @@ static int nfp_tun_mac_event_handler(struct notifier_block *nb,
 int nfp_tunnel_config_start(struct nfp_app *app)
 {
 	struct nfp_flower_priv *priv = app->priv;
-	struct net_device *netdev;
-	int err;
 
 	/* Initialise priv data for MAC offloading. */
 	priv->nfp_mac_off_count = 0;
 	mutex_init(&priv->nfp_mac_off_lock);
 	INIT_LIST_HEAD(&priv->nfp_mac_off_list);
-	priv->nfp_tun_mac_nb.notifier_call = nfp_tun_mac_event_handler;
 	mutex_init(&priv->nfp_mac_index_lock);
 	INIT_LIST_HEAD(&priv->nfp_mac_index_list);
 	ida_init(&priv->nfp_mac_off_ids);
@@ -707,27 +691,7 @@ int nfp_tunnel_config_start(struct nfp_app *app)
 	INIT_LIST_HEAD(&priv->nfp_neigh_off_list);
 	priv->nfp_tun_neigh_nb.notifier_call = nfp_tun_neigh_event_handler;
 
-	err = register_netdevice_notifier(&priv->nfp_tun_mac_nb);
-	if (err)
-		goto err_free_mac_ida;
-
-	err = register_netevent_notifier(&priv->nfp_tun_neigh_nb);
-	if (err)
-		goto err_unreg_mac_nb;
-
-	/* Parse netdevs already registered for MACs that need offloaded. */
-	rtnl_lock();
-	for_each_netdev(&init_net, netdev)
-		nfp_tun_add_to_mac_offload_list(netdev, app);
-	rtnl_unlock();
-
-	return 0;
-
-err_unreg_mac_nb:
-	unregister_netdevice_notifier(&priv->nfp_tun_mac_nb);
-err_free_mac_ida:
-	ida_destroy(&priv->nfp_mac_off_ids);
-	return err;
+	return register_netevent_notifier(&priv->nfp_tun_neigh_nb);
 }
 
 void nfp_tunnel_config_stop(struct nfp_app *app)
@@ -739,7 +703,6 @@ void nfp_tunnel_config_stop(struct nfp_app *app)
 	struct nfp_ipv4_addr_entry *ip_entry;
 	struct list_head *ptr, *storage;
 
-	unregister_netdevice_notifier(&priv->nfp_tun_mac_nb);
 	unregister_netevent_notifier(&priv->nfp_tun_neigh_nb);
 
 	/* Free any memory that may be occupied by MAC list. */

drivers/net/ethernet/netronome/nfp/nfp_app.c

@@ -136,6 +136,53 @@ nfp_app_reprs_set(struct nfp_app *app, enum nfp_repr_type type,
 	return old;
 }
 
+static int
+nfp_app_netdev_event(struct notifier_block *nb, unsigned long event, void *ptr)
+{
+	struct net_device *netdev;
+	struct nfp_app *app;
+
+	netdev = netdev_notifier_info_to_dev(ptr);
+	app = container_of(nb, struct nfp_app, netdev_nb);
+
+	if (app->type->netdev_event)
+		return app->type->netdev_event(app, netdev, event, ptr);
+	return NOTIFY_DONE;
+}
+
+int nfp_app_start(struct nfp_app *app, struct nfp_net *ctrl)
+{
+	int err;
+
+	app->ctrl = ctrl;
+
+	if (app->type->start) {
+		err = app->type->start(app);
+		if (err)
+			return err;
+	}
+
+	app->netdev_nb.notifier_call = nfp_app_netdev_event;
+	err = register_netdevice_notifier(&app->netdev_nb);
+	if (err)
+		goto err_app_stop;
+
+	return 0;
+
+err_app_stop:
+	if (app->type->stop)
+		app->type->stop(app);
+	return err;
+}
+
+void nfp_app_stop(struct nfp_app *app)
+{
+	unregister_netdevice_notifier(&app->netdev_nb);
+
+	if (app->type->stop)
+		app->type->stop(app);
+}
+
 struct nfp_app *nfp_app_alloc(struct nfp_pf *pf, enum nfp_app_id id)
 {
 	struct nfp_app *app;

drivers/net/ethernet/netronome/nfp/nfp_app.h

@@ -69,6 +69,7 @@ extern const struct nfp_app_type app_abm;
  * @port_get_stats_strings:	get strings for extra statistics
  * @start:	start application logic
  * @stop:	stop application logic
+ * @netdev_event:	Netdevice notifier event
  * @ctrl_msg_rx:    control message handler
  * @ctrl_msg_rx_raw:	handler for control messages from data queues
  * @setup_tc:	setup TC ndo
@@ -122,6 +123,9 @@ struct nfp_app_type {
 	int (*start)(struct nfp_app *app);
 	void (*stop)(struct nfp_app *app);
 
+	int (*netdev_event)(struct nfp_app *app, struct net_device *netdev,
+			    unsigned long event, void *ptr);
+
 	void (*ctrl_msg_rx)(struct nfp_app *app, struct sk_buff *skb);
 	void (*ctrl_msg_rx_raw)(struct nfp_app *app, const void *data,
 				unsigned int len);
@@ -151,6 +155,7 @@ struct nfp_app_type {
  * @reprs:	array of pointers to representors
  * @type:	pointer to const application ops and info
  * @ctrl_mtu:	MTU to set on the control vNIC (set in .init())
+ * @netdev_nb:	Netdevice notifier block
  * @priv:	app-specific priv data
  */
 struct nfp_app {
@@ -163,6 +168,9 @@ struct nfp_app {
 
 	const struct nfp_app_type *type;
 	unsigned int ctrl_mtu;
+
+	struct notifier_block netdev_nb;
+
 	void *priv;
 };
 
@@ -264,21 +272,6 @@ nfp_app_repr_change_mtu(struct nfp_app *app, struct net_device *netdev,
 	return app->type->repr_change_mtu(app, netdev, new_mtu);
 }
 
-static inline int nfp_app_start(struct nfp_app *app, struct nfp_net *ctrl)
-{
-	app->ctrl = ctrl;
-	if (!app->type->start)
-		return 0;
-	return app->type->start(app);
-}
-
-static inline void nfp_app_stop(struct nfp_app *app)
-{
-	if (!app->type->stop)
-		return;
-	app->type->stop(app);
-}
-
 static inline const char *nfp_app_name(struct nfp_app *app)
 {
 	if (!app)
@@ -430,6 +423,8 @@ nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size, gfp_t priority);
 
 struct nfp_app *nfp_app_alloc(struct nfp_pf *pf, enum nfp_app_id id);
 void nfp_app_free(struct nfp_app *app);
+int nfp_app_start(struct nfp_app *app, struct nfp_net *ctrl);
+void nfp_app_stop(struct nfp_app *app);
 
 /* Callbacks shared between apps */