[net-next 03/14] net/mlx5e: Use ipv6_stub to avoid dependency with ipv6 being a module

[Saeed Mahameed]

mlx5 is dependent on IPv6 tristate since we use ipv6's nd_tbl directly,
alternatively we can use ipv6_stub->nd_tbl and remove the dependency.

Reported-by: Walter Harms <wha...@bfs.de>
Reviewed-by: Mark Bloch <ma...@mellanox.com>
Reviewed-by: Vlad Buslov <vla...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 .../net/ethernet/mellanox/mlx5/core/Kconfig   |  1 -
 .../net/ethernet/mellanox/mlx5/core/en_rep.c  | 23 +++++++++++--------
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   |  2 +-
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig 
b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
index a496f2ac20b0..0dba272a5b2f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
@@ -33,7 +33,6 @@ config MLX5_FPGA
 config MLX5_CORE_EN
        bool "Mellanox 5th generation network adapters (ConnectX series) 
Ethernet support"
        depends on NETDEVICES && ETHERNET && INET && PCI && MLX5_CORE
-       depends on IPV6=y || IPV6=n || MLX5_CORE=m
        select PAGE_POOL
        select DIMLIB
        default n
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 1623cd32f303..95892a3b63a1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -38,6 +38,7 @@
 #include <net/netevent.h>
 #include <net/arp.h>
 #include <net/devlink.h>
+#include <net/ipv6_stubs.h>
 
 #include "eswitch.h"
 #include "en.h"
@@ -499,16 +500,18 @@ void mlx5e_remove_sqs_fwd_rules(struct mlx5e_priv *priv)
        mlx5e_sqs2vport_stop(esw, rep);
 }
 
+static unsigned long mlx5e_rep_ipv6_interval(void)
+{
+       if (IS_ENABLED(CONFIG_IPV6) && ipv6_stub->nd_tbl)
+               return NEIGH_VAR(&ipv6_stub->nd_tbl->parms, DELAY_PROBE_TIME);
+
+       return ~0UL;
+}
+
 static void mlx5e_rep_neigh_update_init_interval(struct mlx5e_rep_priv *rpriv)
 {
-#if IS_ENABLED(CONFIG_IPV6)
-       unsigned long ipv6_interval = NEIGH_VAR(&nd_tbl.parms,
-                                               DELAY_PROBE_TIME);
-#else
-       unsigned long ipv6_interval = ~0UL;
-#endif
-       unsigned long ipv4_interval = NEIGH_VAR(&arp_tbl.parms,
-                                               DELAY_PROBE_TIME);
+       unsigned long ipv4_interval = NEIGH_VAR(&arp_tbl.parms, 
DELAY_PROBE_TIME);
+       unsigned long ipv6_interval = mlx5e_rep_ipv6_interval();
        struct net_device *netdev = rpriv->netdev;
        struct mlx5e_priv *priv = netdev_priv(netdev);
 
@@ -917,7 +920,7 @@ static int mlx5e_rep_netevent_event(struct notifier_block 
*nb,
        case NETEVENT_NEIGH_UPDATE:
                n = ptr;
 #if IS_ENABLED(CONFIG_IPV6)
-               if (n->tbl != &nd_tbl && n->tbl != &arp_tbl)
+               if (n->tbl != ipv6_stub->nd_tbl && n->tbl != &arp_tbl)
 #else
                if (n->tbl != &arp_tbl)
 #endif
@@ -944,7 +947,7 @@ static int mlx5e_rep_netevent_event(struct notifier_block 
*nb,
                 * done per device delay prob time parameter.
                 */
 #if IS_ENABLED(CONFIG_IPV6)
-               if (!p->dev || (p->tbl != &nd_tbl && p->tbl != &arp_tbl))
+               if (!p->dev || (p->tbl != ipv6_stub->nd_tbl && p->tbl != 
&arp_tbl))
 #else
                if (!p->dev || p->tbl != &arp_tbl)
 #endif
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 30d26eba75a3..98d1f7a48304 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -1492,7 +1492,7 @@ void mlx5e_tc_update_neigh_used_value(struct 
mlx5e_neigh_hash_entry *nhe)
                tbl = &arp_tbl;
 #if IS_ENABLED(CONFIG_IPV6)
        else if (m_neigh->family == AF_INET6)
-               tbl = &nd_tbl;
+               tbl = ipv6_stub->nd_tbl;
 #endif
        else
                return;
-- 
2.21.0