[patch net-next] mlxsw: spectrum_router: Fix build when IPv6 isn't enabled

[Jiri Pirko]

From: Ido Schimmel <ido...@mellanox.com>

When IPv6 isn't enabled the following error is generated:

ERROR: "nd_tbl" [drivers/net/ethernet/mellanox/mlxsw/mlxsw_spectrum.ko]
undefined!

Fix it by replacing 'arp_tbl' and 'nd_tbl' with 'tbl->family' wherever
possible and reference 'nd_tbl' only when IPV6 is enabled.

Fixes: d5eb89cf68d6 ("mlxsw: spectrum_router: Reflect IPv6 neighbours to the 
device")
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
Reported-by: kbuild test robot <fengguang...@intel.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index e6d629f..274f72a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -43,6 +43,7 @@
 #include <linux/inetdevice.h>
 #include <linux/netdevice.h>
 #include <linux/if_bridge.h>
+#include <linux/socket.h>
 #include <net/netevent.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
@@ -949,9 +950,13 @@ mlxsw_sp_router_neighs_update_interval_init(struct 
mlxsw_sp *mlxsw_sp)
 {
        unsigned long interval;
 
+#if IS_ENABLED(CONFIG_IPV6)
        interval = min_t(unsigned long,
                         NEIGH_VAR(&arp_tbl.parms, DELAY_PROBE_TIME),
                         NEIGH_VAR(&nd_tbl.parms, DELAY_PROBE_TIME));
+#else
+       interval = NEIGH_VAR(&arp_tbl.parms, DELAY_PROBE_TIME);
+#endif
        mlxsw_sp->router->neighs_update.interval = jiffies_to_msecs(interval);
 }
 
@@ -986,6 +991,7 @@ static void mlxsw_sp_router_neigh_ent_ipv4_process(struct 
mlxsw_sp *mlxsw_sp,
        neigh_release(n);
 }
 
+#if IS_ENABLED(IPV6)
 static void mlxsw_sp_router_neigh_ent_ipv6_process(struct mlxsw_sp *mlxsw_sp,
                                                   char *rauhtd_pl,
                                                   int rec_index)
@@ -1015,6 +1021,13 @@ static void 
mlxsw_sp_router_neigh_ent_ipv6_process(struct mlxsw_sp *mlxsw_sp,
        neigh_event_send(n, NULL);
        neigh_release(n);
 }
+#else
+static void mlxsw_sp_router_neigh_ent_ipv6_process(struct mlxsw_sp *mlxsw_sp,
+                                                  char *rauhtd_pl,
+                                                  int rec_index)
+{
+}
+#endif
 
 static void mlxsw_sp_router_neigh_rec_ipv4_process(struct mlxsw_sp *mlxsw_sp,
                                                   char *rauhtd_pl,
@@ -1260,10 +1273,10 @@ mlxsw_sp_neigh_entry_update(struct mlxsw_sp *mlxsw_sp,
        if (!adding && !neigh_entry->connected)
                return;
        neigh_entry->connected = adding;
-       if (neigh_entry->key.n->tbl == &arp_tbl) {
+       if (neigh_entry->key.n->tbl->family == AF_INET) {
                mlxsw_sp_router_neigh_entry_op4(mlxsw_sp, neigh_entry,
                                                mlxsw_sp_rauht_op(adding));
-       } else if (neigh_entry->key.n->tbl == &nd_tbl) {
+       } else if (neigh_entry->key.n->tbl->family == AF_INET6) {
                if (mlxsw_sp_neigh_ipv6_ignore(neigh_entry->key.n))
                        return;
                mlxsw_sp_router_neigh_entry_op6(mlxsw_sp, neigh_entry,
@@ -1339,7 +1352,8 @@ int mlxsw_sp_router_netevent_event(struct notifier_block 
*unused,
                p = ptr;
 
                /* We don't care about changes in the default table. */
-               if (!p->dev || (p->tbl != &arp_tbl && p->tbl != &nd_tbl))
+               if (!p->dev || (p->tbl->family != AF_INET &&
+                               p->tbl->family != AF_INET6))
                        return NOTIFY_DONE;
 
                /* We are in atomic context and can't take RTNL mutex,
@@ -1358,7 +1372,7 @@ int mlxsw_sp_router_netevent_event(struct notifier_block 
*unused,
        case NETEVENT_NEIGH_UPDATE:
                n = ptr;
 
-               if (n->tbl != &arp_tbl && n->tbl != &nd_tbl)
+               if (n->tbl->family != AF_INET && n->tbl->family != AF_INET6)
                        return NOTIFY_DONE;
 
                mlxsw_sp_port = mlxsw_sp_port_lower_dev_hold(n->dev);
-- 
2.9.3