[PATCHv3 for-next 1/1] RDMA/rxe: Disable ipv6 features when ipv6.disable set in cmdline

[Zhu Yanjun <yanjun.zhu@intel.com>]

From: Zhu Yanjun <zyjzyj2000@gmail.com>

When ipv6.disable=1 is set in cmdline, ipv6 is actually disabled
in the stack. As such, the operations of ipv6 in RXE will fail.
So ipv6 features in RXE should also be disabled in RXE.

Fixes: 8700e3e7c4857 ("Soft RoCE driver")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
---
V2->V3: Remove print message
V1->V2: Modify the pr_info messages
---
---
 drivers/infiniband/sw/rxe/rxe_net.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index 01662727dca0..3b8ed007e8af 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -72,6 +72,9 @@ static struct dst_entry *rxe_find_route6(struct net_device *ndev,
 	struct dst_entry *ndst;
 	struct flowi6 fl6 = { { 0 } };
 
+	if (!ipv6_mod_enabled())
+		return NULL;
+
 	memset(&fl6, 0, sizeof(fl6));
 	fl6.flowi6_oif = ndev->ifindex;
 	memcpy(&fl6.saddr, saddr, sizeof(*saddr));
@@ -616,6 +619,8 @@ static int rxe_net_ipv4_init(void)
 static int rxe_net_ipv6_init(void)
 {
 #if IS_ENABLED(CONFIG_IPV6)
+	if (!ipv6_mod_enabled())
+		return 0;
 
 	recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
 						htons(ROCE_V2_UDP_DPORT), true);
-- 
2.27.0