mlxsw: spectrum: Distinguish between IPv4/6 tunnels

struct ip_tunnel_parm, where GRE and several other tunnel types hold
information, is IPv4-specific. The current router / ipip code in mlxsw
however uses it as if it were generic.

Make it clear that it's not. Rename many functions from _params_ to
_params4_. mlxsw_sp_ipip_parms_saddr() and _daddr() take a proto
argument to dispatch on it. Move the dispatch logic to
mlxsw_sp_ipip_netdev_saddr() and _daddr(), and replace with
single-protocol functions.

In struct mlxsw_sp_ipip_entry, move the "parms" field to a (for the time
being, singleton) union. Update users throughout.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c

@@ -37,122 +37,89 @@
 #include "spectrum_ipip.h"
 
 struct ip_tunnel_parm
-mlxsw_sp_ipip_netdev_parms(const struct net_device *ol_dev)
+mlxsw_sp_ipip_netdev_parms4(const struct net_device *ol_dev)
 {
 	struct ip_tunnel *tun = netdev_priv(ol_dev);
 
 	return tun->parms;
 }
 
-static bool mlxsw_sp_ipip_parms_has_ikey(struct ip_tunnel_parm parms)
+static bool mlxsw_sp_ipip_parms4_has_ikey(struct ip_tunnel_parm parms)
 {
 	return !!(parms.i_flags & TUNNEL_KEY);
 }
 
-static bool mlxsw_sp_ipip_parms_has_okey(struct ip_tunnel_parm parms)
+static bool mlxsw_sp_ipip_parms4_has_okey(struct ip_tunnel_parm parms)
 {
 	return !!(parms.o_flags & TUNNEL_KEY);
 }
 
-static u32 mlxsw_sp_ipip_parms_ikey(struct ip_tunnel_parm parms)
+static u32 mlxsw_sp_ipip_parms4_ikey(struct ip_tunnel_parm parms)
 {
-	return mlxsw_sp_ipip_parms_has_ikey(parms) ?
+	return mlxsw_sp_ipip_parms4_has_ikey(parms) ?
 		be32_to_cpu(parms.i_key) : 0;
 }
 
-static u32 mlxsw_sp_ipip_parms_okey(struct ip_tunnel_parm parms)
+static u32 mlxsw_sp_ipip_parms4_okey(struct ip_tunnel_parm parms)
 {
-	return mlxsw_sp_ipip_parms_has_okey(parms) ?
+	return mlxsw_sp_ipip_parms4_has_okey(parms) ?
 		be32_to_cpu(parms.o_key) : 0;
 }
 
-static __be32 mlxsw_sp_ipip_parms_saddr4(struct ip_tunnel_parm parms)
+static union mlxsw_sp_l3addr
+mlxsw_sp_ipip_parms4_saddr(struct ip_tunnel_parm parms)
 {
-	return parms.iph.saddr;
+	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.saddr };
 }
 
 static union mlxsw_sp_l3addr
-mlxsw_sp_ipip_parms_saddr(enum mlxsw_sp_l3proto proto,
-			  struct ip_tunnel_parm parms)
+mlxsw_sp_ipip_parms4_daddr(struct ip_tunnel_parm parms)
 {
-	switch (proto) {
-	case MLXSW_SP_L3_PROTO_IPV4:
-		return (union mlxsw_sp_l3addr) {
-			.addr4 = mlxsw_sp_ipip_parms_saddr4(parms),
-		};
-	case MLXSW_SP_L3_PROTO_IPV6:
-		break;
-	}
-
-	WARN_ON(1);
-	return (union mlxsw_sp_l3addr) {
-		.addr4 = 0,
-	};
+	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.daddr };
 }
 
-static __be32 mlxsw_sp_ipip_parms_daddr4(struct ip_tunnel_parm parms)
+union mlxsw_sp_l3addr
+mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
+			   const struct net_device *ol_dev)
 {
-	return parms.iph.daddr;
-}
+	struct ip_tunnel_parm parms4;
 
-static union mlxsw_sp_l3addr
-mlxsw_sp_ipip_parms_daddr(enum mlxsw_sp_l3proto proto,
-			  struct ip_tunnel_parm parms)
-{
 	switch (proto) {
 	case MLXSW_SP_L3_PROTO_IPV4:
-		return (union mlxsw_sp_l3addr) {
-			.addr4 = mlxsw_sp_ipip_parms_daddr4(parms),
-		};
+		parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
+		return mlxsw_sp_ipip_parms4_saddr(parms4);
 	case MLXSW_SP_L3_PROTO_IPV6:
 		break;
 	}
 
 	WARN_ON(1);
-	return (union mlxsw_sp_l3addr) {
-		.addr4 = 0,
-	};
-}
-
-static bool mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev)
-{
-	return mlxsw_sp_ipip_parms_has_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev));
-}
-
-static bool mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev)
-{
-	return mlxsw_sp_ipip_parms_has_okey(mlxsw_sp_ipip_netdev_parms(ol_dev));
+	return (union mlxsw_sp_l3addr) {0};
 }
 
-static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev)
+static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
 {
-	return mlxsw_sp_ipip_parms_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev));
-}
 
-static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev)
-{
-	return mlxsw_sp_ipip_parms_okey(mlxsw_sp_ipip_netdev_parms(ol_dev));
-}
+	struct ip_tunnel_parm parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 
-union mlxsw_sp_l3addr
-mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
-			   const struct net_device *ol_dev)
-{
-	return mlxsw_sp_ipip_parms_saddr(proto,
-					 mlxsw_sp_ipip_netdev_parms(ol_dev));
-}
-
-static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
-{
-	return mlxsw_sp_ipip_parms_daddr4(mlxsw_sp_ipip_netdev_parms(ol_dev));
+	return mlxsw_sp_ipip_parms4_daddr(parms4).addr4;
 }
 
 static union mlxsw_sp_l3addr
 mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto,
 			   const struct net_device *ol_dev)
 {
-	return mlxsw_sp_ipip_parms_daddr(proto,
-					 mlxsw_sp_ipip_netdev_parms(ol_dev));
+	struct ip_tunnel_parm parms4;
+
+	switch (proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
+		return mlxsw_sp_ipip_parms4_daddr(parms4);
+	case MLXSW_SP_L3_PROTO_IPV6:
+		break;
+	}
+
+	WARN_ON(1);
+	return (union mlxsw_sp_l3addr) {0};
 }
 
 static int
@@ -176,12 +143,17 @@ mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
 				     u32 tunnel_index,
 				     struct mlxsw_sp_ipip_entry *ipip_entry)
 {
-	bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev);
 	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
-	u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev);
 	char rtdp_pl[MLXSW_REG_RTDP_LEN];
+	struct ip_tunnel_parm parms;
 	unsigned int type_check;
+	bool has_ikey;
 	u32 daddr4;
+	u32 ikey;
+
+	parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);
+	has_ikey = mlxsw_sp_ipip_parms4_has_ikey(parms);
+	ikey = mlxsw_sp_ipip_parms4_ikey(parms);
 
 	mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index);
 
@@ -273,14 +245,15 @@ static struct mlxsw_sp_rif_ipip_lb_config
 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp,
 				      const struct net_device *ol_dev)
 {
+	struct ip_tunnel_parm parms = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 	enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
 
-	lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
+	lb_ipipt = mlxsw_sp_ipip_parms4_has_okey(parms) ?
 		MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP :
 		MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP;
 	return (struct mlxsw_sp_rif_ipip_lb_config){
 		.lb_ipipt = lb_ipipt,
-		.okey = mlxsw_sp_ipip_netdev_okey(ol_dev),
+		.okey = mlxsw_sp_ipip_parms4_okey(parms),
 		.ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
 		.saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 						    ol_dev),
@@ -300,16 +273,12 @@ mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 	bool update_nhs = false;
 	int err = 0;
 
-	new_parms = mlxsw_sp_ipip_netdev_parms(ipip_entry->ol_dev);
+	new_parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);
 
-	new_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4,
-					      new_parms);
-	old_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4,
-					      ipip_entry->parms);
-	new_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4,
-					      new_parms);
-	old_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4,
-					      ipip_entry->parms);
+	new_saddr = mlxsw_sp_ipip_parms4_saddr(new_parms);
+	old_saddr = mlxsw_sp_ipip_parms4_saddr(ipip_entry->parms4);
+	new_daddr = mlxsw_sp_ipip_parms4_daddr(new_parms);
+	old_daddr = mlxsw_sp_ipip_parms4_daddr(ipip_entry->parms4);
 
 	if (!mlxsw_sp_l3addr_eq(&new_saddr, &old_saddr)) {
 		u16 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev);
@@ -326,14 +295,14 @@ mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 		}
 
 		update_tunnel = true;
-	} else if ((mlxsw_sp_ipip_parms_okey(ipip_entry->parms) !=
-		    mlxsw_sp_ipip_parms_okey(new_parms)) ||
-		   ipip_entry->parms.link != new_parms.link) {
+	} else if ((mlxsw_sp_ipip_parms4_okey(ipip_entry->parms4) !=
+		    mlxsw_sp_ipip_parms4_okey(new_parms)) ||
+		   ipip_entry->parms4.link != new_parms.link) {
 		update_tunnel = true;
 	} else if (!mlxsw_sp_l3addr_eq(&new_daddr, &old_daddr)) {
 		update_nhs = true;
-	} else if (mlxsw_sp_ipip_parms_ikey(ipip_entry->parms) !=
-		   mlxsw_sp_ipip_parms_ikey(new_parms)) {
+	} else if (mlxsw_sp_ipip_parms4_ikey(ipip_entry->parms4) !=
+		   mlxsw_sp_ipip_parms4_ikey(new_parms)) {
 		update_decap = true;
 	}
 
@@ -350,7 +319,7 @@ mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 							  false, false, false,
 							  extack);
 
-	ipip_entry->parms = new_parms;
+	ipip_entry->parms4 = new_parms;
 	return err;
 }
 

drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h

@@ -40,7 +40,7 @@
 #include <linux/if_tunnel.h>
 
 struct ip_tunnel_parm
-mlxsw_sp_ipip_netdev_parms(const struct net_device *ol_dev);
+mlxsw_sp_ipip_netdev_parms4(const struct net_device *ol_dev);
 
 union mlxsw_sp_l3addr
 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
@@ -57,7 +57,9 @@ struct mlxsw_sp_ipip_entry {
 	struct mlxsw_sp_rif_ipip_lb *ol_lb;
 	struct mlxsw_sp_fib_entry *decap_fib_entry;
 	struct list_head ipip_list_node;
-	struct ip_tunnel_parm parms;
+	union {
+		struct ip_tunnel_parm parms4;
+	};
 };
 
 struct mlxsw_sp_ipip_ops {

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

 /*
  * drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
- * Copyright (c) 2016-2017 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016-2018 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  * Copyright (c) 2016 Ido Schimmel <idosch@mellanox.com>
  * Copyright (c) 2016 Yotam Gigi <yotamg@mellanox.com>
- * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
+ * Copyright (c) 2017-2018 Petr Machata <petrm@mellanox.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -1020,9 +1020,11 @@ mlxsw_sp_ipip_entry_alloc(struct mlxsw_sp *mlxsw_sp,
 			  enum mlxsw_sp_ipip_type ipipt,
 			  struct net_device *ol_dev)
 {
+	const struct mlxsw_sp_ipip_ops *ipip_ops;
 	struct mlxsw_sp_ipip_entry *ipip_entry;
 	struct mlxsw_sp_ipip_entry *ret = NULL;
 
+	ipip_ops = mlxsw_sp->router->ipip_ops_arr[ipipt];
 	ipip_entry = kzalloc(sizeof(*ipip_entry), GFP_KERNEL);
 	if (!ipip_entry)
 		return ERR_PTR(-ENOMEM);
@@ -1036,7 +1038,15 @@ mlxsw_sp_ipip_entry_alloc(struct mlxsw_sp *mlxsw_sp,
 
 	ipip_entry->ipipt = ipipt;
 	ipip_entry->ol_dev = ol_dev;
-	ipip_entry->parms = mlxsw_sp_ipip_netdev_parms(ol_dev);
+
+	switch (ipip_ops->ul_proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		ipip_entry->parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
+		break;
+	case MLXSW_SP_L3_PROTO_IPV6:
+		WARN_ON(1);
+		break;
+	}
 
 	return ipip_entry;