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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/* Copyright (c) 2018 Mellanox Technologies. */
#include <net/vxlan.h>
#include <net/gre.h>
#include "lib/vxlan.h"
#include "en/tc_tun.h"
static int get_route_and_out_devs(struct mlx5e_priv *priv,
struct net_device *dev,
struct net_device **route_dev,
struct net_device **out_dev)
{
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
struct net_device *uplink_dev, *uplink_upper;
bool dst_is_lag_dev;
uplink_dev = mlx5_eswitch_uplink_get_proto_dev(esw, REP_ETH);
uplink_upper = netdev_master_upper_dev_get(uplink_dev);
dst_is_lag_dev = (uplink_upper &&
netif_is_lag_master(uplink_upper) &&
dev == uplink_upper &&
mlx5_lag_is_sriov(priv->mdev));
/* if the egress device isn't on the same HW e-switch or
* it's a LAG device, use the uplink
*/
if (!switchdev_port_same_parent_id(priv->netdev, dev) ||
dst_is_lag_dev) {
*route_dev = uplink_dev;
*out_dev = *route_dev;
} else {
*route_dev = dev;
if (is_vlan_dev(*route_dev))
*out_dev = uplink_dev;
else if (mlx5e_eswitch_rep(dev))
*out_dev = *route_dev;
else
return -EOPNOTSUPP;
}
return 0;
}
static int mlx5e_route_lookup_ipv4(struct mlx5e_priv *priv,
struct net_device *mirred_dev,
struct net_device **out_dev,
struct net_device **route_dev,
struct flowi4 *fl4,
struct neighbour **out_n,
u8 *out_ttl)
{
struct rtable *rt;
struct neighbour *n = NULL;
#if IS_ENABLED(CONFIG_INET)
int ret;
rt = ip_route_output_key(dev_net(mirred_dev), fl4);
ret = PTR_ERR_OR_ZERO(rt);
if (ret)
return ret;
#else
return -EOPNOTSUPP;
#endif
ret = get_route_and_out_devs(priv, rt->dst.dev, route_dev, out_dev);
if (ret < 0)
return ret;
if (!(*out_ttl))
*out_ttl = ip4_dst_hoplimit(&rt->dst);
n = dst_neigh_lookup(&rt->dst, &fl4->daddr);
ip_rt_put(rt);
if (!n)
return -ENOMEM;
*out_n = n;
return 0;
}
static const char *mlx5e_netdev_kind(struct net_device *dev)
{
if (dev->rtnl_link_ops)
return dev->rtnl_link_ops->kind;
else
return "";
}
static int mlx5e_route_lookup_ipv6(struct mlx5e_priv *priv,
struct net_device *mirred_dev,
struct net_device **out_dev,
struct net_device **route_dev,
struct flowi6 *fl6,
struct neighbour **out_n,
u8 *out_ttl)
{
struct neighbour *n = NULL;
struct dst_entry *dst;
#if IS_ENABLED(CONFIG_INET) && IS_ENABLED(CONFIG_IPV6)
int ret;
ret = ipv6_stub->ipv6_dst_lookup(dev_net(mirred_dev), NULL, &dst,
fl6);
if (ret < 0)
return ret;
if (!(*out_ttl))
*out_ttl = ip6_dst_hoplimit(dst);
ret = get_route_and_out_devs(priv, dst->dev, route_dev, out_dev);
if (ret < 0)
return ret;
#else
return -EOPNOTSUPP;
#endif
n = dst_neigh_lookup(dst, &fl6->daddr);
dst_release(dst);
if (!n)
return -ENOMEM;
*out_n = n;
return 0;
}
static int mlx5e_gen_vxlan_header(char buf[], struct ip_tunnel_key *tun_key)
{
__be32 tun_id = tunnel_id_to_key32(tun_key->tun_id);
struct udphdr *udp = (struct udphdr *)(buf);
struct vxlanhdr *vxh = (struct vxlanhdr *)
((char *)udp + sizeof(struct udphdr));
udp->dest = tun_key->tp_dst;
vxh->vx_flags = VXLAN_HF_VNI;
vxh->vx_vni = vxlan_vni_field(tun_id);
return 0;
}
static int mlx5e_gen_gre_header(char buf[], struct ip_tunnel_key *tun_key)
{
__be32 tun_id = tunnel_id_to_key32(tun_key->tun_id);
int hdr_len;
struct gre_base_hdr *greh = (struct gre_base_hdr *)(buf);
/* the HW does not calculate GRE csum or sequences */
if (tun_key->tun_flags & (TUNNEL_CSUM | TUNNEL_SEQ))
return -EOPNOTSUPP;
greh->protocol = htons(ETH_P_TEB);
/* GRE key */
hdr_len = gre_calc_hlen(tun_key->tun_flags);
greh->flags = gre_tnl_flags_to_gre_flags(tun_key->tun_flags);
if (tun_key->tun_flags & TUNNEL_KEY) {
__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
*ptr = tun_id;
}
return 0;
}
static int mlx5e_gen_ip_tunnel_header(char buf[], __u8 *ip_proto,
struct mlx5e_encap_entry *e)
{
int err = 0;
struct ip_tunnel_key *key = &e->tun_info.key;
if (e->tunnel_type == MLX5E_TC_TUNNEL_TYPE_VXLAN) {
*ip_proto = IPPROTO_UDP;
err = mlx5e_gen_vxlan_header(buf, key);
} else if (e->tunnel_type == MLX5E_TC_TUNNEL_TYPE_GRETAP) {
*ip_proto = IPPROTO_GRE;
err = mlx5e_gen_gre_header(buf, key);
} else {
pr_warn("mlx5: Cannot generate tunnel header for tunnel type (%d)\n"
, e->tunnel_type);
err = -EOPNOTSUPP;
}
return err;
}
static char *gen_eth_tnl_hdr(char *buf, struct net_device *dev,
struct mlx5e_encap_entry *e,
u16 proto)
{
struct ethhdr *eth = (struct ethhdr *)buf;
char *ip;
ether_addr_copy(eth->h_dest, e->
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