nfp: flower: compute link aggregation action

If the egress device of an offloaded rule is a LAG port, then encode the
output port to the NFP with a LAG identifier and the offloaded group ID.

A prelag action is also offloaded which must be the first action of the
series (although may appear after other pre-actions - e.g. tunnels). This
causes the FW to check that it has the necessary information to output to
the requested LAG port. If it does not, the packet is sent to the kernel
before any other actions are applied to it.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -72,6 +72,42 @@ nfp_fl_push_vlan(struct nfp_fl_push_vlan *push_vlan,
 	push_vlan->vlan_tci = cpu_to_be16(tmp_push_vlan_tci);
 }
 
+static int
+nfp_fl_pre_lag(struct nfp_app *app, const struct tc_action *action,
+	       struct nfp_fl_payload *nfp_flow, int act_len)
+{
+	size_t act_size = sizeof(struct nfp_fl_pre_lag);
+	struct nfp_fl_pre_lag *pre_lag;
+	struct net_device *out_dev;
+	int err;
+
+	out_dev = tcf_mirred_dev(action);
+	if (!out_dev || !netif_is_lag_master(out_dev))
+		return 0;
+
+	if (act_len + act_size > NFP_FL_MAX_A_SIZ)
+		return -EOPNOTSUPP;
+
+	/* Pre_lag action must be first on action list.
+	 * If other actions already exist they need pushed forward.
+	 */
+	if (act_len)
+		memmove(nfp_flow->action_data + act_size,
+			nfp_flow->action_data, act_len);
+
+	pre_lag = (struct nfp_fl_pre_lag *)nfp_flow->action_data;
+	err = nfp_flower_lag_populate_pre_action(app, out_dev, pre_lag);
+	if (err)
+		return err;
+
+	pre_lag->head.jump_id = NFP_FL_ACTION_OPCODE_PRE_LAG;
+	pre_lag->head.len_lw = act_size >> NFP_FL_LW_SIZ;
+
+	nfp_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
+
+	return act_size;
+}
+
 static bool nfp_fl_netdev_is_tunnel_type(struct net_device *out_dev,
 					 enum nfp_flower_tun_type tun_type)
 {
@@ -88,12 +124,13 @@ static bool nfp_fl_netdev_is_tunnel_type(struct net_device *out_dev,
 }
 
 static int
-nfp_fl_output(struct nfp_fl_output *output, const struct tc_action *action,
-	      struct nfp_fl_payload *nfp_flow, bool last,
-	      struct net_device *in_dev, enum nfp_flower_tun_type tun_type,
-	      int *tun_out_cnt)
+nfp_fl_output(struct nfp_app *app, struct nfp_fl_output *output,
+	      const struct tc_action *action, struct nfp_fl_payload *nfp_flow,
+	      bool last, struct net_device *in_dev,
+	      enum nfp_flower_tun_type tun_type, int *tun_out_cnt)
 {
 	size_t act_size = sizeof(struct nfp_fl_output);
+	struct nfp_flower_priv *priv = app->priv;
 	struct net_device *out_dev;
 	u16 tmp_flags;
 
@@ -118,6 +155,15 @@ nfp_fl_output(struct nfp_fl_output *output, const struct tc_action *action,
 		output->flags = cpu_to_be16(tmp_flags |
 					    NFP_FL_OUT_FLAGS_USE_TUN);
 		output->port = cpu_to_be32(NFP_FL_PORT_TYPE_TUN | tun_type);
+	} else if (netif_is_lag_master(out_dev) &&
+		   priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
+		int gid;
+
+		output->flags = cpu_to_be16(tmp_flags);
+		gid = nfp_flower_lag_get_output_id(app, out_dev);
+		if (gid < 0)
+			return gid;
+		output->port = cpu_to_be32(NFP_FL_LAG_OUT | gid);
 	} else {
 		/* Set action output parameters. */
 		output->flags = cpu_to_be16(tmp_flags);
@@ -164,7 +210,7 @@ static struct nfp_fl_pre_tunnel *nfp_fl_pre_tunnel(char *act_data, int act_len)
 	struct nfp_fl_pre_tunnel *pre_tun_act;
 
 	/* Pre_tunnel action must be first on action list.
-	 * If other actions already exist they need pushed forward.
+	 * If other actions already exist they need to be pushed forward.
 	 */
 	if (act_len)
 		memmove(act_data + act_size, act_data, act_len);
@@ -443,42 +489,73 @@ nfp_fl_pedit(const struct tc_action *action, char *nfp_action, int *a_len)
 }
 
 static int
-nfp_flower_loop_action(const struct tc_action *a,
+nfp_flower_output_action(struct nfp_app *app, const struct tc_action *a,
+			 struct nfp_fl_payload *nfp_fl, int *a_len,
+			 struct net_device *netdev, bool last,
+			 enum nfp_flower_tun_type *tun_type, int *tun_out_cnt,
+			 int *out_cnt)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_fl_output *output;
+	int err, prelag_size;
+
+	if (*a_len + sizeof(struct nfp_fl_output) > NFP_FL_MAX_A_SIZ)
+		return -EOPNOTSUPP;
+
+	output = (struct nfp_fl_output *)&nfp_fl->action_data[*a_len];
+	err = nfp_fl_output(app, output, a, nfp_fl, last, netdev, *tun_type,
+			    tun_out_cnt);
+	if (err)
+		return err;
+
+	*a_len += sizeof(struct nfp_fl_output);
+
+	if (priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
+		/* nfp_fl_pre_lag returns -err or size of prelag action added.
+		 * This will be 0 if it is not egressing to a lag dev.
+		 */
+		prelag_size = nfp_fl_pre_lag(app, a, nfp_fl, *a_len);
+		if (prelag_size < 0)
+			return prelag_size;
+		else if (prelag_size > 0 && (!last || *out_cnt))
+			return -EOPNOTSUPP;
+
+		*a_len += prelag_size;
+	}
+	(*out_cnt)++;
+
+	return 0;
+}
+
+static int
+nfp_flower_loop_action(struct nfp_app *app, const struct tc_action *a,
 		       struct nfp_fl_payload *nfp_fl, int *a_len,
 		       struct net_device *netdev,
-		       enum nfp_flower_tun_type *tun_type, int *tun_out_cnt)
+		       enum nfp_flower_tun_type *tun_type, int *tun_out_cnt,
+		       int *out_cnt)
 {
 	struct nfp_fl_set_ipv4_udp_tun *set_tun;
 	struct nfp_fl_pre_tunnel *pre_tun;
 	struct nfp_fl_push_vlan *psh_v;
 	struct nfp_fl_pop_vlan *pop_v;
-	struct nfp_fl_output *output;
 	int err;
 
 	if (is_tcf_gact_shot(a)) {
 		nfp_fl->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_DROP);
 	} else if (is_tcf_mirred_egress_redirect(a)) {
-		if (*a_len + sizeof(struct nfp_fl_output) > NFP_FL_MAX_A_SIZ)
-			return -EOPNOTSUPP;
-
-		output = (struct nfp_fl_output *)&nfp_fl->action_data[*a_len];
-		err = nfp_fl_output(output, a, nfp_fl, true, netdev, *tun_type,
-				    tun_out_cnt);
+		err = nfp_flower_output_action(app, a, nfp_fl, a_len, netdev,
+					       true, tun_type, tun_out_cnt,
+					       out_cnt);
 		if (err)
 			return err;
 
-		*a_len += sizeof(struct nfp_fl_output);
 	} else if (is_tcf_mirred_egress_mirror(a)) {
-		if (*a_len + sizeof(struct nfp_fl_output) > NFP_FL_MAX_A_SIZ)
-			return -EOPNOTSUPP;
-
-		output = (struct nfp_fl_output *)&nfp_fl->action_data[*a_len];
-		err = nfp_fl_output(output, a, nfp_fl, false, netdev, *tun_type,
-				    tun_out_cnt);
+		err = nfp_flower_output_action(app, a, nfp_fl, a_len, netdev,
+					       false, tun_type, tun_out_cnt,
+					       out_cnt);
 		if (err)
 			return err;
 
-		*a_len += sizeof(struct nfp_fl_output);
 	} else if (is_tcf_vlan(a) && tcf_vlan_action(a) == TCA_VLAN_ACT_POP) {
 		if (*a_len + sizeof(struct nfp_fl_pop_vlan) > NFP_FL_MAX_A_SIZ)
 			return -EOPNOTSUPP;
@@ -535,11 +612,12 @@ nfp_flower_loop_action(const struct tc_action *a,
 	return 0;
 }
 
-int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
+int nfp_flower_compile_action(struct nfp_app *app,
+			      struct tc_cls_flower_offload *flow,
 			      struct net_device *netdev,
 			      struct nfp_fl_payload *nfp_flow)
 {
-	int act_len, act_cnt, err, tun_out_cnt;
+	int act_len, act_cnt, err, tun_out_cnt, out_cnt;
 	enum nfp_flower_tun_type tun_type;
 	const struct tc_action *a;
 	LIST_HEAD(actions);
@@ -550,11 +628,12 @@ int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
 	act_len = 0;
 	act_cnt = 0;
 	tun_out_cnt = 0;
+	out_cnt = 0;
 
 	tcf_exts_to_list(flow->exts, &actions);
 	list_for_each_entry(a, &actions, list) {
-		err = nfp_flower_loop_action(a, nfp_flow, &act_len, netdev,
-					     &tun_type, &tun_out_cnt);
+		err = nfp_flower_loop_action(app, a, nfp_flow, &act_len, netdev,
+					     &tun_type, &tun_out_cnt, &out_cnt);
 		if (err)
 			return err;
 		act_cnt++;

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

@@ -92,6 +92,7 @@
 #define NFP_FL_ACTION_OPCODE_SET_IPV6_DST	12
 #define NFP_FL_ACTION_OPCODE_SET_UDP		14
 #define NFP_FL_ACTION_OPCODE_SET_TCP		15
+#define NFP_FL_ACTION_OPCODE_PRE_LAG		16
 #define NFP_FL_ACTION_OPCODE_PRE_TUNNEL		17
 #define NFP_FL_ACTION_OPCODE_NUM		32
 
@@ -103,6 +104,9 @@
 #define NFP_FL_PUSH_VLAN_CFI		BIT(12)
 #define NFP_FL_PUSH_VLAN_VID		GENMASK(11, 0)
 
+/* LAG ports */
+#define NFP_FL_LAG_OUT			0xC0DE0000
+
 /* Tunnel ports */
 #define NFP_FL_PORT_TYPE_TUN		0x50000000
 #define NFP_FL_IPV4_TUNNEL_TYPE		GENMASK(7, 4)
@@ -177,6 +181,15 @@ struct nfp_fl_pop_vlan {
 	__be16 reserved;
 };
 
+struct nfp_fl_pre_lag {
+	struct nfp_fl_act_head head;
+	__be16 group_id;
+	u8 lag_version[3];
+	u8 instance;
+};
+
+#define NFP_FL_PRE_LAG_VER_OFF	8
+
 struct nfp_fl_pre_tunnel {
 	struct nfp_fl_act_head head;
 	__be16 reserved;

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

@@ -184,6 +184,48 @@ nfp_fl_lag_find_group_for_master_with_lag(struct nfp_fl_lag *lag,
 	return NULL;
 }
 
+int nfp_flower_lag_populate_pre_action(struct nfp_app *app,
+				       struct net_device *master,
+				       struct nfp_fl_pre_lag *pre_act)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_fl_lag_group *group = NULL;
+	__be32 temp_vers;
+
+	mutex_lock(&priv->nfp_lag.lock);
+	group = nfp_fl_lag_find_group_for_master_with_lag(&priv->nfp_lag,
+							  master);
+	if (!group) {
+		mutex_unlock(&priv->nfp_lag.lock);
+		return -ENOENT;
+	}
+
+	pre_act->group_id = cpu_to_be16(group->group_id);
+	temp_vers = cpu_to_be32(priv->nfp_lag.batch_ver <<
+				NFP_FL_PRE_LAG_VER_OFF);
+	memcpy(pre_act->lag_version, &temp_vers, 3);
+	pre_act->instance = group->group_inst;
+	mutex_unlock(&priv->nfp_lag.lock);
+
+	return 0;
+}
+
+int nfp_flower_lag_get_output_id(struct nfp_app *app, struct net_device *master)
+{
+	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_fl_lag_group *group = NULL;
+	int group_id = -ENOENT;
+
+	mutex_lock(&priv->nfp_lag.lock);
+	group = nfp_fl_lag_find_group_for_master_with_lag(&priv->nfp_lag,
+							  master);
+	if (group)
+		group_id = group->group_id;
+	mutex_unlock(&priv->nfp_lag.lock);
+
+	return group_id;
+}
+
 static int
 nfp_fl_lag_config_group(struct nfp_fl_lag *lag, struct nfp_fl_lag_group *group,
 			struct net_device **active_members,

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

@@ -45,6 +45,7 @@
 #include <linux/workqueue.h>
 #include <linux/idr.h>
 
+struct nfp_fl_pre_lag;
 struct net_device;
 struct nfp_app;
 
@@ -253,7 +254,8 @@ int nfp_flower_compile_flow_match(struct tc_cls_flower_offload *flow,
 				  struct net_device *netdev,
 				  struct nfp_fl_payload *nfp_flow,
 				  enum nfp_flower_tun_type tun_type);
-int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
+int nfp_flower_compile_action(struct nfp_app *app,
+			      struct tc_cls_flower_offload *flow,
 			      struct net_device *netdev,
 			      struct nfp_fl_payload *nfp_flow);
 int nfp_compile_flow_metadata(struct nfp_app *app,
@@ -284,5 +286,10 @@ 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);
 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,
+				       struct nfp_fl_pre_lag *pre_act);
+int nfp_flower_lag_get_output_id(struct nfp_app *app,
+				 struct net_device *master);
 
 #endif

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

@@ -440,7 +440,7 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 	if (err)
 		goto err_destroy_flow;
 
-	err = nfp_flower_compile_action(flow, netdev, flow_pay);
+	err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 	if (err)
 		goto err_destroy_flow;