drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c - linux - Git at Google

 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
 /* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */

 #include <net/ip_tunnels.h>
 #include <net/ip6_tunnel.h>
 #include <net/inet_ecn.h>

 #include "spectrum_ipip.h"
 #include "reg.h"

 struct ip_tunnel_parm
 mlxsw_sp_ipip_netdev_parms4(const struct net_device *ol_dev)
 {
 	struct ip_tunnel *tun = netdev_priv(ol_dev);

 	return tun->parms;
 }

 struct __ip6_tnl_parm
 mlxsw_sp_ipip_netdev_parms6(const struct net_device *ol_dev)
 {
 	struct ip6_tnl *tun = netdev_priv(ol_dev);

 	return tun->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_parms4_has_okey(struct ip_tunnel_parm parms)
 {
 	return !!(parms.o_flags & TUNNEL_KEY);
 }

 static u32 mlxsw_sp_ipip_parms4_ikey(struct ip_tunnel_parm parms)
 {
 	return mlxsw_sp_ipip_parms4_has_ikey(parms) ?
 		be32_to_cpu(parms.i_key) : 0;
 }

 static u32 mlxsw_sp_ipip_parms4_okey(struct ip_tunnel_parm parms)
 {
 	return mlxsw_sp_ipip_parms4_has_okey(parms) ?
 		be32_to_cpu(parms.o_key) : 0;
 }

 static union mlxsw_sp_l3addr
 mlxsw_sp_ipip_parms4_saddr(struct ip_tunnel_parm parms)
 {
 	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.saddr };
 }

 static union mlxsw_sp_l3addr
 mlxsw_sp_ipip_parms6_saddr(struct __ip6_tnl_parm parms)
 {
 	return (union mlxsw_sp_l3addr) { .addr6 = parms.laddr };
 }

 static union mlxsw_sp_l3addr
 mlxsw_sp_ipip_parms4_daddr(struct ip_tunnel_parm parms)
 {
 	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.daddr };
 }

 static union mlxsw_sp_l3addr
 mlxsw_sp_ipip_parms6_daddr(struct __ip6_tnl_parm parms)
 {
 	return (union mlxsw_sp_l3addr) { .addr6 = parms.raddr };
 }

 union mlxsw_sp_l3addr
 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
 			   const struct net_device *ol_dev)
 {
 	struct ip_tunnel_parm parms4;
 	struct __ip6_tnl_parm parms6;

 	switch (proto) {
 	case MLXSW_SP_L3_PROTO_IPV4:
 		parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
 		return mlxsw_sp_ipip_parms4_saddr(parms4);
 	case MLXSW_SP_L3_PROTO_IPV6:
 		parms6 = mlxsw_sp_ipip_netdev_parms6(ol_dev);
 		return mlxsw_sp_ipip_parms6_saddr(parms6);
 	}

 	WARN_ON(1);
 	return (union mlxsw_sp_l3addr) {0};
 }

 static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
 {

 	struct ip_tunnel_parm parms4 = mlxsw_sp_ipip_netdev_parms4(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)
 {
 	struct ip_tunnel_parm parms4;
 	struct __ip6_tnl_parm parms6;

 	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:
 		parms6 = mlxsw_sp_ipip_netdev_parms6(ol_dev);
 		return mlxsw_sp_ipip_parms6_daddr(parms6);
 	}

 	WARN_ON(1);
 	return (union mlxsw_sp_l3addr) {0};
 }

 bool mlxsw_sp_l3addr_is_zero(union mlxsw_sp_l3addr addr)
 {
 	union mlxsw_sp_l3addr naddr = {0};

 	return !memcmp(&addr, &naddr, sizeof(naddr));
 }

 static int
 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 				  struct mlxsw_sp_ipip_entry *ipip_entry)
 {
 	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 	__be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
 	char ratr_pl[MLXSW_REG_RATR_LEN];

 	mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
 			    true, MLXSW_REG_RATR_TYPE_IPIP,
 			    adj_index, rif_index);
 	mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));

 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 }

 static int
 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
 				     u32 tunnel_index,
 				     struct mlxsw_sp_ipip_entry *ipip_entry)
 {
 	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 	u16 ul_rif_id = mlxsw_sp_ipip_lb_ul_rif_id(ipip_entry->ol_lb);
 	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);
 	mlxsw_reg_rtdp_egress_router_interface_set(rtdp_pl, ul_rif_id);

 	type_check = has_ikey ?
 		MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
 		MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;

 	/* Linux demuxes tunnels based on packet SIP (which must match tunnel
 	 * remote IP). Thus configure decap so that it filters out packets that
 	 * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
 	 * generated for packets that fail this criterion. Linux then handles
 	 * such packets in slow path and generates ICMP destination unreachable.
 	 */
 	daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
 	mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
 				  MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
 				  type_check, has_ikey, daddr4, ikey);

 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
 }

 static int
 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
 				      u32 dip, u8 prefix_len, u16 ul_vr_id,
 				      enum mlxsw_reg_ralue_op op,
 				      u32 tunnel_index)
 {
 	char ralue_pl[MLXSW_REG_RALUE_LEN];

 	mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
 			      ul_vr_id, prefix_len, dip);
 	mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
 }

 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
 					struct mlxsw_sp_ipip_entry *ipip_entry,
 					enum mlxsw_reg_ralue_op op,
 					u32 tunnel_index)
 {
 	u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
 	__be32 dip;
 	int err;

 	err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
 						   ipip_entry);
 	if (err)
 		return err;

 	dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 					 ipip_entry->ol_dev).addr4;
 	return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
 						     32, ul_vr_id, op,
 						     tunnel_index);
 }

 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
 					  const struct net_device *ol_dev)
 {
 	union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
 	union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);

 	/* Tunnels with unset local or remote address are valid in Linux and
 	 * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
 	 * (NBMA) tunnels. In principle these can be offloaded, but the driver
 	 * currently doesn't support this. So punt.
 	 */
 	return !mlxsw_sp_l3addr_is_zero(saddr) &&
 	       !mlxsw_sp_l3addr_is_zero(daddr);
 }

 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
 					   const struct net_device *ol_dev,
 					   enum mlxsw_sp_l3proto ol_proto)
 {
 	struct ip_tunnel *tunnel = netdev_priv(ol_dev);
 	__be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
 	bool inherit_ttl = tunnel->parms.iph.ttl == 0;
 	bool inherit_tos = tunnel->parms.iph.tos & 0x1;

 	return (tunnel->parms.i_flags & ~okflags) == 0 &&
 	       (tunnel->parms.o_flags & ~okflags) == 0 &&
 	       inherit_ttl && inherit_tos &&
 	       mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
 }

 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_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_parms4_okey(parms),
 		.ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
 		.saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 						    ol_dev),
 	};
 }

 static int
 mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 				    struct mlxsw_sp_ipip_entry *ipip_entry,
 				    struct netlink_ext_ack *extack)
 {
 	union mlxsw_sp_l3addr old_saddr, new_saddr;
 	union mlxsw_sp_l3addr old_daddr, new_daddr;
 	struct ip_tunnel_parm new_parms;
 	bool update_tunnel = false;
 	bool update_decap = false;
 	bool update_nhs = false;
 	int err = 0;

 	new_parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);

 	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);

 		/* Since the local address has changed, if there is another
 		 * tunnel with a matching saddr, both need to be demoted.
 		 */
 		if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp,
 							 MLXSW_SP_L3_PROTO_IPV4,
 							 new_saddr, ul_tb_id,
 							 ipip_entry)) {
 			mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry);
 			return 0;
 		}

 		update_tunnel = true;
 	} 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_parms4_ikey(ipip_entry->parms4) !=
 		   mlxsw_sp_ipip_parms4_ikey(new_parms)) {
 		update_decap = true;
 	}

 	if (update_tunnel)
 		err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 							  true, true, true,
 							  extack);
 	else if (update_nhs)
 		err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 							  false, false, true,
 							  extack);
 	else if (update_decap)
 		err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 							  false, false, false,
 							  extack);

 	ipip_entry->parms4 = new_parms;
 	return err;
 }

 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
 	.dev_type = ARPHRD_IPGRE,
 	.ul_proto = MLXSW_SP_L3_PROTO_IPV4,
 	.nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
 	.fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
 	.can_offload = mlxsw_sp_ipip_can_offload_gre4,
 	.ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
 	.ol_netdev_change = mlxsw_sp_ipip_ol_netdev_change_gre4,
 };

 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
 	[MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,
 };

 static int mlxsw_sp_ipip_ecn_encap_init_one(struct mlxsw_sp *mlxsw_sp,
 					    u8 inner_ecn, u8 outer_ecn)
 {
 	char tieem_pl[MLXSW_REG_TIEEM_LEN];

 	mlxsw_reg_tieem_pack(tieem_pl, inner_ecn, outer_ecn);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tieem), tieem_pl);
 }

 int mlxsw_sp_ipip_ecn_encap_init(struct mlxsw_sp *mlxsw_sp)
 {
 	int i;

 	/* Iterate over inner ECN values */
 	for (i = INET_ECN_NOT_ECT; i <= INET_ECN_CE; i++) {
 		u8 outer_ecn = INET_ECN_encapsulate(0, i);
 		int err;

 		err = mlxsw_sp_ipip_ecn_encap_init_one(mlxsw_sp, i, outer_ecn);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 static int mlxsw_sp_ipip_ecn_decap_init_one(struct mlxsw_sp *mlxsw_sp,
 					    u8 inner_ecn, u8 outer_ecn)
 {
 	char tidem_pl[MLXSW_REG_TIDEM_LEN];
 	bool trap_en, set_ce = false;
 	u8 new_inner_ecn;

 	trap_en = __INET_ECN_decapsulate(outer_ecn, inner_ecn, &set_ce);
 	new_inner_ecn = set_ce ? INET_ECN_CE : inner_ecn;

 	mlxsw_reg_tidem_pack(tidem_pl, outer_ecn, inner_ecn, new_inner_ecn,
 			     trap_en, trap_en ? MLXSW_TRAP_ID_DECAP_ECN0 : 0);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tidem), tidem_pl);
 }

 int mlxsw_sp_ipip_ecn_decap_init(struct mlxsw_sp *mlxsw_sp)
 {
 	int i, j, err;

 	/* Iterate over inner ECN values */
 	for (i = INET_ECN_NOT_ECT; i <= INET_ECN_CE; i++) {
 		/* Iterate over outer ECN values */
 		for (j = INET_ECN_NOT_ECT; j <= INET_ECN_CE; j++) {
 			err = mlxsw_sp_ipip_ecn_decap_init_one(mlxsw_sp, i, j);
 			if (err)
 				return err;
 		}
 	}

 	return 0;
 }
	// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
	/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */

	#include <net/ip_tunnels.h>
	#include <net/ip6_tunnel.h>
	#include <net/inet_ecn.h>

	#include "spectrum_ipip.h"
	#include "reg.h"

	struct ip_tunnel_parm
	mlxsw_sp_ipip_netdev_parms4(const struct net_device *ol_dev)
	{
	struct ip_tunnel *tun = netdev_priv(ol_dev);

	return tun->parms;
	}

	struct __ip6_tnl_parm
	mlxsw_sp_ipip_netdev_parms6(const struct net_device *ol_dev)
	{
	struct ip6_tnl *tun = netdev_priv(ol_dev);

	return tun->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_parms4_has_okey(struct ip_tunnel_parm parms)
	{
	return !!(parms.o_flags & TUNNEL_KEY);
	}

	static u32 mlxsw_sp_ipip_parms4_ikey(struct ip_tunnel_parm parms)
	{
	return mlxsw_sp_ipip_parms4_has_ikey(parms) ?
	be32_to_cpu(parms.i_key) : 0;
	}

	static u32 mlxsw_sp_ipip_parms4_okey(struct ip_tunnel_parm parms)
	{
	return mlxsw_sp_ipip_parms4_has_okey(parms) ?
	be32_to_cpu(parms.o_key) : 0;
	}

	static union mlxsw_sp_l3addr
	mlxsw_sp_ipip_parms4_saddr(struct ip_tunnel_parm parms)
	{
	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.saddr };
	}

	static union mlxsw_sp_l3addr
	mlxsw_sp_ipip_parms6_saddr(struct __ip6_tnl_parm parms)
	{
	return (union mlxsw_sp_l3addr) { .addr6 = parms.laddr };
	}

	static union mlxsw_sp_l3addr
	mlxsw_sp_ipip_parms4_daddr(struct ip_tunnel_parm parms)
	{
	return (union mlxsw_sp_l3addr) { .addr4 = parms.iph.daddr };
	}

	static union mlxsw_sp_l3addr
	mlxsw_sp_ipip_parms6_daddr(struct __ip6_tnl_parm parms)
	{
	return (union mlxsw_sp_l3addr) { .addr6 = parms.raddr };
	}

	union mlxsw_sp_l3addr
	mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
	const struct net_device *ol_dev)
	{
	struct ip_tunnel_parm parms4;
	struct __ip6_tnl_parm parms6;

	switch (proto) {
	case MLXSW_SP_L3_PROTO_IPV4:
	parms4 = mlxsw_sp_ipip_netdev_parms4(ol_dev);
	return mlxsw_sp_ipip_parms4_saddr(parms4);
	case MLXSW_SP_L3_PROTO_IPV6:
	parms6 = mlxsw_sp_ipip_netdev_parms6(ol_dev);
	return mlxsw_sp_ipip_parms6_saddr(parms6);
	}

	WARN_ON(1);
	return (union mlxsw_sp_l3addr) {0};
	}

	static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
	{

	struct ip_tunnel_parm parms4 = mlxsw_sp_ipip_netdev_parms4(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)
	{
	struct ip_tunnel_parm parms4;
	struct __ip6_tnl_parm parms6;

	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:
	parms6 = mlxsw_sp_ipip_netdev_parms6(ol_dev);
	return mlxsw_sp_ipip_parms6_daddr(parms6);
	}

	WARN_ON(1);
	return (union mlxsw_sp_l3addr) {0};
	}

	bool mlxsw_sp_l3addr_is_zero(union mlxsw_sp_l3addr addr)
	{
	union mlxsw_sp_l3addr naddr = {0};

	return !memcmp(&addr, &naddr, sizeof(naddr));
	}

	static int
	mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
	struct mlxsw_sp_ipip_entry *ipip_entry)
	{
	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
	__be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
	char ratr_pl[MLXSW_REG_RATR_LEN];

	mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
	true, MLXSW_REG_RATR_TYPE_IPIP,
	adj_index, rif_index);
	mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));

	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
	}

	static int
	mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
	u32 tunnel_index,
	struct mlxsw_sp_ipip_entry *ipip_entry)
	{
	u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
	u16 ul_rif_id = mlxsw_sp_ipip_lb_ul_rif_id(ipip_entry->ol_lb);
	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);
	mlxsw_reg_rtdp_egress_router_interface_set(rtdp_pl, ul_rif_id);

	type_check = has_ikey ?
	MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
	MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;

	/* Linux demuxes tunnels based on packet SIP (which must match tunnel
	* remote IP). Thus configure decap so that it filters out packets that
	* are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
	* generated for packets that fail this criterion. Linux then handles
	* such packets in slow path and generates ICMP destination unreachable.
	*/
	daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
	mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
	MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
	type_check, has_ikey, daddr4, ikey);

	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
	}

	static int
	mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
	u32 dip, u8 prefix_len, u16 ul_vr_id,
	enum mlxsw_reg_ralue_op op,
	u32 tunnel_index)
	{
	char ralue_pl[MLXSW_REG_RALUE_LEN];

	mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
	ul_vr_id, prefix_len, dip);
	mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
	}

	static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
	struct mlxsw_sp_ipip_entry *ipip_entry,
	enum mlxsw_reg_ralue_op op,
	u32 tunnel_index)
	{
	u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
	__be32 dip;
	int err;

	err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
	ipip_entry);
	if (err)
	return err;

	dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
	ipip_entry->ol_dev).addr4;
	return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
	32, ul_vr_id, op,
	tunnel_index);
	}

	static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
	const struct net_device *ol_dev)
	{
	union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
	union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);

	/* Tunnels with unset local or remote address are valid in Linux and
	* used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
	* (NBMA) tunnels. In principle these can be offloaded, but the driver
	* currently doesn't support this. So punt.
	*/
	return !mlxsw_sp_l3addr_is_zero(saddr) &&
	!mlxsw_sp_l3addr_is_zero(daddr);
	}

	static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
	const struct net_device *ol_dev,
	enum mlxsw_sp_l3proto ol_proto)
	{
	struct ip_tunnel *tunnel = netdev_priv(ol_dev);
	__be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
	bool inherit_ttl = tunnel->parms.iph.ttl == 0;
	bool inherit_tos = tunnel->parms.iph.tos & 0x1;

	return (tunnel->parms.i_flags & ~okflags) == 0 &&
	(tunnel->parms.o_flags & ~okflags) == 0 &&
	inherit_ttl && inherit_tos &&
	mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
	}

	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_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_parms4_okey(parms),
	.ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
	.saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
	ol_dev),
	};
	}

	static int
	mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
	struct mlxsw_sp_ipip_entry *ipip_entry,
	struct netlink_ext_ack *extack)
	{
	union mlxsw_sp_l3addr old_saddr, new_saddr;
	union mlxsw_sp_l3addr old_daddr, new_daddr;
	struct ip_tunnel_parm new_parms;
	bool update_tunnel = false;
	bool update_decap = false;
	bool update_nhs = false;
	int err = 0;

	new_parms = mlxsw_sp_ipip_netdev_parms4(ipip_entry->ol_dev);

	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);

	/* Since the local address has changed, if there is another
	* tunnel with a matching saddr, both need to be demoted.
	*/
	if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp,
	MLXSW_SP_L3_PROTO_IPV4,
	new_saddr, ul_tb_id,
	ipip_entry)) {
	mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry);
	return 0;
	}

	update_tunnel = true;
	} 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_parms4_ikey(ipip_entry->parms4) !=
	mlxsw_sp_ipip_parms4_ikey(new_parms)) {
	update_decap = true;
	}

	if (update_tunnel)
	err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
	true, true, true,
	extack);
	else if (update_nhs)
	err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
	false, false, true,
	extack);
	else if (update_decap)
	err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
	false, false, false,
	extack);

	ipip_entry->parms4 = new_parms;
	return err;
	}

	static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
	.dev_type = ARPHRD_IPGRE,
	.ul_proto = MLXSW_SP_L3_PROTO_IPV4,
	.nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
	.fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
	.can_offload = mlxsw_sp_ipip_can_offload_gre4,
	.ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
	.ol_netdev_change = mlxsw_sp_ipip_ol_netdev_change_gre4,
	};

	const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
	[MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,
	};

	static int mlxsw_sp_ipip_ecn_encap_init_one(struct mlxsw_sp *mlxsw_sp,
	u8 inner_ecn, u8 outer_ecn)
	{
	char tieem_pl[MLXSW_REG_TIEEM_LEN];

	mlxsw_reg_tieem_pack(tieem_pl, inner_ecn, outer_ecn);
	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tieem), tieem_pl);
	}

	int mlxsw_sp_ipip_ecn_encap_init(struct mlxsw_sp *mlxsw_sp)
	{
	int i;

	/* Iterate over inner ECN values */
	for (i = INET_ECN_NOT_ECT; i <= INET_ECN_CE; i++) {
	u8 outer_ecn = INET_ECN_encapsulate(0, i);
	int err;

	err = mlxsw_sp_ipip_ecn_encap_init_one(mlxsw_sp, i, outer_ecn);
	if (err)
	return err;
	}

	return 0;
	}

	static int mlxsw_sp_ipip_ecn_decap_init_one(struct mlxsw_sp *mlxsw_sp,
	u8 inner_ecn, u8 outer_ecn)
	{
	char tidem_pl[MLXSW_REG_TIDEM_LEN];
	bool trap_en, set_ce = false;
	u8 new_inner_ecn;

	trap_en = __INET_ECN_decapsulate(outer_ecn, inner_ecn, &set_ce);
	new_inner_ecn = set_ce ? INET_ECN_CE : inner_ecn;

	mlxsw_reg_tidem_pack(tidem_pl, outer_ecn, inner_ecn, new_inner_ecn,
	trap_en, trap_en ? MLXSW_TRAP_ID_DECAP_ECN0 : 0);
	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tidem), tidem_pl);
	}

	int mlxsw_sp_ipip_ecn_decap_init(struct mlxsw_sp *mlxsw_sp)
	{
	int i, j, err;

	/* Iterate over inner ECN values */
	for (i = INET_ECN_NOT_ECT; i <= INET_ECN_CE; i++) {
	/* Iterate over outer ECN values */
	for (j = INET_ECN_NOT_ECT; j <= INET_ECN_CE; j++) {
	err = mlxsw_sp_ipip_ecn_decap_init_one(mlxsw_sp, i, j);
	if (err)
	return err;
	}
	}

	return 0;
	}