Merge branch 'ingress-actions'

Shmulik Ladkani says:

====================
act_mirred: Ingress actions support

This patch series implements action mirred 'ingress' actions
TCA_INGRESS_REDIR and TCA_INGRESS_MIRROR.

This allows attaching filters whose target is to hand matching skbs into
the rx processing of a specified device.

v4:
  in 4/4, check ret code of netif_receive_skb, as suggested by Cong Wang
v3:
  in 4/4, addressed non coherency due to reading m->tcfm_eaction multiple
  times, as spotted by Eric Dumazet
v2:
  in 1/4, declare tcfm_mac_header_xmit as bool instead of int
====================

Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 73 insertions, 29 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
index 49d2debb334e..52af62e0ecb6 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_u32.c
@@ -113,7 +113,7 @@ static int fill_action_fields(struct adapter *adap,
 		}
 
 		/* Re-direct to specified port in hardware. */
-		if (is_tcf_mirred_redirect(a)) {
+		if (is_tcf_mirred_egress_redirect(a)) {
 			struct net_device *n_dev;
 			unsigned int i, index;
 			bool found = false;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index a244d9a67264..784b0b98ab2f 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8410,7 +8410,7 @@ static int parse_tc_actions(struct ixgbe_adapter *adapter,
 		}
 
 		/* Redirect to a VF or a offloaded macvlan */
-		if (is_tcf_mirred_redirect(a)) {
+		if (is_tcf_mirred_egress_redirect(a)) {
 			int ifindex = tcf_mirred_ifindex(a);
 
 			err = handle_redirect_action(adapter, ifindex, queue,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index ce8c54d18906..135a95bcc392 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -404,7 +404,7 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
 			continue;
 		}
 
-		if (is_tcf_mirred_redirect(a)) {
+		if (is_tcf_mirred_egress_redirect(a)) {
 			int ifindex = tcf_mirred_ifindex(a);
 			struct net_device *out_dev;
 			struct mlx5e_priv *out_priv;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 1ec0a4ce3c46..43a5eddc2c11 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -1237,8 +1237,10 @@ static int mlxsw_sp_port_add_cls_matchall(struct mlxsw_sp_port *mlxsw_sp_port,
 
 	tcf_exts_to_list(cls->exts, &actions);
 	list_for_each_entry(a, &actions, list) {
-		if (!is_tcf_mirred_mirror(a) || protocol != htons(ETH_P_ALL))
+		if (!is_tcf_mirred_egress_mirror(a) ||
+		    protocol != htons(ETH_P_ALL)) {
 			return -ENOTSUPP;
+		}
 
 		err = mlxsw_sp_port_add_cls_matchall_mirror(mlxsw_sp_port, cls,
 							    a, ingress);
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
index 8acfb631a0ea..cfed40c0e310 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
@@ -128,7 +128,7 @@ nfp_net_bpf_get_act(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)
 		if (is_tcf_gact_shot(a))
 			return NN_ACT_TC_DROP;
 
-		if (is_tcf_mirred_redirect(a) &&
+		if (is_tcf_mirred_egress_redirect(a) &&
 		    tcf_mirred_ifindex(a) == nn->netdev->ifindex)
 			return NN_ACT_TC_REDIR;
 	}
diff --git a/include/net/tc_act/tc_mirred.h b/include/net/tc_act/tc_mirred.h
index 62770add15bd..604bc31e23ab 100644
--- a/include/net/tc_act/tc_mirred.h
+++ b/include/net/tc_act/tc_mirred.h
@@ -8,13 +8,13 @@ struct tcf_mirred {
 	struct tc_action	common;
 	int			tcfm_eaction;
 	int			tcfm_ifindex;
-	int			tcfm_ok_push;
+	bool			tcfm_mac_header_xmit;
 	struct net_device __rcu	*tcfm_dev;
 	struct list_head	tcfm_list;
 };
 #define to_mirred(a) ((struct tcf_mirred *)a)
 
-static inline bool is_tcf_mirred_redirect(const struct tc_action *a)
+static inline bool is_tcf_mirred_egress_redirect(const struct tc_action *a)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	if (a->ops && a->ops->type == TCA_ACT_MIRRED)
@@ -23,7 +23,7 @@ static inline bool is_tcf_mirred_redirect(const struct tc_action *a)
 	return false;
 }
 
-static inline bool is_tcf_mirred_mirror(const struct tc_action *a)
+static inline bool is_tcf_mirred_egress_mirror(const struct tc_action *a)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	if (a->ops && a->ops->type == TCA_ACT_MIRRED)
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 667dc382df82..2d93be6717e5 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -33,6 +33,25 @@
 static LIST_HEAD(mirred_list);
 static DEFINE_SPINLOCK(mirred_list_lock);
 
+static bool tcf_mirred_is_act_redirect(int action)
+{
+	return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR;
+}
+
+static u32 tcf_mirred_act_direction(int action)
+{
+	switch (action) {
+	case TCA_EGRESS_REDIR:
+	case TCA_EGRESS_MIRROR:
+		return AT_EGRESS;
+	case TCA_INGRESS_REDIR:
+	case TCA_INGRESS_MIRROR:
+		return AT_INGRESS;
+	default:
+		BUG();
+	}
+}
+
 static void tcf_mirred_release(struct tc_action *a, int bind)
 {
 	struct tcf_mirred *m = to_mirred(a);
@@ -54,17 +73,32 @@ static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
 static int mirred_net_id;
 static struct tc_action_ops act_mirred_ops;
 
+static bool dev_is_mac_header_xmit(const struct net_device *dev)
+{
+	switch (dev->type) {
+	case ARPHRD_TUNNEL:
+	case ARPHRD_TUNNEL6:
+	case ARPHRD_SIT:
+	case ARPHRD_IPGRE:
+	case ARPHRD_VOID:
+	case ARPHRD_NONE:
+		return false;
+	}
+	return true;
+}
+
 static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 			   struct nlattr *est, struct tc_action **a, int ovr,
 			   int bind)
 {
 	struct tc_action_net *tn = net_generic(net, mirred_net_id);
 	struct nlattr *tb[TCA_MIRRED_MAX + 1];
+	bool mac_header_xmit = false;
 	struct tc_mirred *parm;
 	struct tcf_mirred *m;
 	struct net_device *dev;
-	int ret, ok_push = 0;
 	bool exists = false;
+	int ret;
 
 	if (nla == NULL)
 		return -EINVAL;
@@ -82,6 +116,8 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 	switch (parm->eaction) {
 	case TCA_EGRESS_MIRROR:
 	case TCA_EGRESS_REDIR:
+	case TCA_INGRESS_REDIR:
+	case TCA_INGRESS_MIRROR:
 		break;
 	default:
 		if (exists)
@@ -95,19 +131,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 				tcf_hash_release(*a, bind);
 			return -ENODEV;
 		}
-		switch (dev->type) {
-		case ARPHRD_TUNNEL:
-		case ARPHRD_TUNNEL6:
-		case ARPHRD_SIT:
-		case ARPHRD_IPGRE:
-		case ARPHRD_VOID:
-		case ARPHRD_NONE:
-			ok_push = 0;
-			break;
-		default:
-			ok_push = 1;
-			break;
-		}
+		mac_header_xmit = dev_is_mac_header_xmit(dev);
 	} else {
 		dev = NULL;
 	}
@@ -136,7 +160,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 			dev_put(rcu_dereference_protected(m->tcfm_dev, 1));
 		dev_hold(dev);
 		rcu_assign_pointer(m->tcfm_dev, dev);
-		m->tcfm_ok_push = ok_push;
+		m->tcfm_mac_header_xmit = mac_header_xmit;
 	}
 
 	if (ret == ACT_P_CREATED) {
@@ -153,15 +177,20 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
 		      struct tcf_result *res)
 {
 	struct tcf_mirred *m = to_mirred(a);
+	bool m_mac_header_xmit;
 	struct net_device *dev;
 	struct sk_buff *skb2;
-	int retval, err;
+	int retval, err = 0;
+	int m_eaction;
+	int mac_len;
 	u32 at;
 
 	tcf_lastuse_update(&m->tcf_tm);
 	bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);
 
 	rcu_read_lock();
+	m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
+	m_eaction = READ_ONCE(m->tcfm_eaction);
 	retval = READ_ONCE(m->tcf_action);
 	dev = rcu_dereference(m->tcfm_dev);
 	if (unlikely(!dev)) {
@@ -180,23 +209,36 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
 	if (!skb2)
 		goto out;
 
-	if (!(at & AT_EGRESS)) {
-		if (m->tcfm_ok_push)
+	/* If action's target direction differs than filter's direction,
+	 * and devices expect a mac header on xmit, then mac push/pull is
+	 * needed.
+	 */
+	if (at != tcf_mirred_act_direction(m_eaction) && m_mac_header_xmit) {
+		if (at & AT_EGRESS) {
+			/* caught at egress, act ingress: pull mac */
+			mac_len = skb_network_header(skb) - skb_mac_header(skb);
+			skb_pull_rcsum(skb2, mac_len);
+		} else {
+			/* caught at ingress, act egress: push mac */
 			skb_push_rcsum(skb2, skb->mac_len);
+		}
 	}
 
 	/* mirror is always swallowed */
-	if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
+	if (tcf_mirred_is_act_redirect(m_eaction))
 		skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
 
 	skb2->skb_iif = skb->dev->ifindex;
 	skb2->dev = dev;
-	err = dev_queue_xmit(skb2);
+	if (tcf_mirred_act_direction(m_eaction) & AT_EGRESS)
+		err = dev_queue_xmit(skb2);
+	else
+		err = netif_receive_skb(skb2);
 
 	if (err) {
 out:
 		qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats));
-		if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
+		if (tcf_mirred_is_act_redirect(m_eaction))
 			retval = TC_ACT_SHOT;
 	}
 	rcu_read_unlock();