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net/mlx5e: Support SRIOV TC encapsulation offloads for IPv6 tunnels
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Add the missing parts for offloading IPv6 tunnels. This includes
route and neigh lookups and construnction of the IPv6 tunnel headers.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Hadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
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Or Gerlitz authored and Saeed Mahameed committed Jan 24, 2017
1 parent 9a94111 commit ce99f6b
Showing 1 changed file with 151 additions and 8 deletions.
159 changes: 151 additions & 8 deletions drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -718,6 +718,47 @@ static int mlx5e_route_lookup_ipv4(struct mlx5e_priv *priv,
return 0;
}

static int mlx5e_route_lookup_ipv6(struct mlx5e_priv *priv,
struct net_device *mirred_dev,
struct net_device **out_dev,
struct flowi6 *fl6,
struct neighbour **out_n,
int *out_ttl)
{
struct neighbour *n = NULL;
struct dst_entry *dst;

#if IS_ENABLED(CONFIG_INET) && IS_ENABLED(CONFIG_IPV6)
struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
int ret;

dst = ip6_route_output(dev_net(mirred_dev), NULL, fl6);
if (dst->error) {
ret = dst->error;
dst_release(dst);
return ret;
}

*out_ttl = ip6_dst_hoplimit(dst);

/* if the egress device isn't on the same HW e-switch, we use the uplink */
if (!switchdev_port_same_parent_id(priv->netdev, dst->dev))
*out_dev = mlx5_eswitch_get_uplink_netdev(esw);
else
*out_dev = dst->dev;
#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 gen_vxlan_header_ipv4(struct net_device *out_dev,
char buf[],
unsigned char h_dest[ETH_ALEN],
Expand Down Expand Up @@ -754,6 +795,41 @@ static int gen_vxlan_header_ipv4(struct net_device *out_dev,
return encap_size;
}

static int gen_vxlan_header_ipv6(struct net_device *out_dev,
char buf[],
unsigned char h_dest[ETH_ALEN],
int ttl,
struct in6_addr *daddr,
struct in6_addr *saddr,
__be16 udp_dst_port,
__be32 vx_vni)
{
int encap_size = VXLAN_HLEN + sizeof(struct ipv6hdr) + ETH_HLEN;
struct ethhdr *eth = (struct ethhdr *)buf;
struct ipv6hdr *ip6h = (struct ipv6hdr *)((char *)eth + sizeof(struct ethhdr));
struct udphdr *udp = (struct udphdr *)((char *)ip6h + sizeof(struct ipv6hdr));
struct vxlanhdr *vxh = (struct vxlanhdr *)((char *)udp + sizeof(struct udphdr));

memset(buf, 0, encap_size);

ether_addr_copy(eth->h_dest, h_dest);
ether_addr_copy(eth->h_source, out_dev->dev_addr);
eth->h_proto = htons(ETH_P_IPV6);

ip6_flow_hdr(ip6h, 0, 0);
/* the HW fills up ipv6 payload len */
ip6h->nexthdr = IPPROTO_UDP;
ip6h->hop_limit = ttl;
ip6h->daddr = *daddr;
ip6h->saddr = *saddr;

udp->dest = udp_dst_port;
vxh->vx_flags = VXLAN_HF_VNI;
vxh->vx_vni = vxlan_vni_field(vx_vni);

return encap_size;
}

static int mlx5e_create_encap_header_ipv4(struct mlx5e_priv *priv,
struct net_device *mirred_dev,
struct mlx5_encap_entry *e,
Expand Down Expand Up @@ -821,6 +897,75 @@ static int mlx5e_create_encap_header_ipv4(struct mlx5e_priv *priv,
return err;
}

static int mlx5e_create_encap_header_ipv6(struct mlx5e_priv *priv,
struct net_device *mirred_dev,
struct mlx5_encap_entry *e,
struct net_device **out_dev)

{
int max_encap_size = MLX5_CAP_ESW(priv->mdev, max_encap_header_size);
struct ip_tunnel_key *tun_key = &e->tun_info.key;
int encap_size, err, ttl = 0;
struct neighbour *n = NULL;
struct flowi6 fl6 = {};
char *encap_header;

encap_header = kzalloc(max_encap_size, GFP_KERNEL);
if (!encap_header)
return -ENOMEM;

switch (e->tunnel_type) {
case MLX5_HEADER_TYPE_VXLAN:
fl6.flowi6_proto = IPPROTO_UDP;
fl6.fl6_dport = tun_key->tp_dst;
break;
default:
err = -EOPNOTSUPP;
goto out;
}

fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tun_key->tos), tun_key->label);
fl6.daddr = tun_key->u.ipv6.dst;
fl6.saddr = tun_key->u.ipv6.src;

err = mlx5e_route_lookup_ipv6(priv, mirred_dev, out_dev,
&fl6, &n, &ttl);
if (err)
goto out;

if (!(n->nud_state & NUD_VALID)) {
pr_warn("%s: can't offload, neighbour to %pI6 invalid\n", __func__, &fl6.daddr);
err = -EOPNOTSUPP;
goto out;
}

e->n = n;
e->out_dev = *out_dev;

neigh_ha_snapshot(e->h_dest, n, *out_dev);

switch (e->tunnel_type) {
case MLX5_HEADER_TYPE_VXLAN:
encap_size = gen_vxlan_header_ipv6(*out_dev, encap_header,
e->h_dest, ttl,
&fl6.daddr,
&fl6.saddr, tun_key->tp_dst,
tunnel_id_to_key32(tun_key->tun_id));
break;
default:
err = -EOPNOTSUPP;
goto out;
}

err = mlx5_encap_alloc(priv->mdev, e->tunnel_type,
encap_size, encap_header, &e->encap_id);
out:
if (err && n)
neigh_release(n);
kfree(encap_header);
return err;
}

static int mlx5e_attach_encap(struct mlx5e_priv *priv,
struct ip_tunnel_info *tun_info,
struct net_device *mirred_dev,
Expand All @@ -831,7 +976,7 @@ static int mlx5e_attach_encap(struct mlx5e_priv *priv,
struct ip_tunnel_key *key = &tun_info->key;
struct mlx5_encap_entry *e;
struct net_device *out_dev;
int tunnel_type, err;
int tunnel_type, err = -EOPNOTSUPP;
uintptr_t hash_key;
bool found = false;

Expand All @@ -856,12 +1001,6 @@ static int mlx5e_attach_encap(struct mlx5e_priv *priv,
return -EOPNOTSUPP;
}

if (family == AF_INET6) {
netdev_warn(priv->netdev,
"IPv6 tunnel encap offload isn't supported\n");
return -EOPNOTSUPP;
}

hash_key = hash_encap_info(key);

hash_for_each_possible_rcu(esw->offloads.encap_tbl, e,
Expand All @@ -885,7 +1024,11 @@ static int mlx5e_attach_encap(struct mlx5e_priv *priv,
e->tunnel_type = tunnel_type;
INIT_LIST_HEAD(&e->flows);

err = mlx5e_create_encap_header_ipv4(priv, mirred_dev, e, &out_dev);
if (family == AF_INET)
err = mlx5e_create_encap_header_ipv4(priv, mirred_dev, e, &out_dev);
else if (family == AF_INET6)
err = mlx5e_create_encap_header_ipv6(priv, mirred_dev, e, &out_dev);

if (err)
goto out_err;

Expand Down

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