>From 9dcdd09f3ca3cf222b563866acd91d18bc4b93d4 Mon Sep 17 00:00:00 2001
From: Zhu Yanjun <zyjzyj2000@xxxxxxxxx>
Date: Sat, 27 Feb 2021 23:01:15 +0000
Subject: [PATCH 1/1] RDMA/rxe: Disable ipv6 features when ipv6.disable set in
cmdline
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.
Reported-by: Yi Zhang <yi.zhang@xxxxxxxxxx>
Signed-off-by: Zhu Yanjun <zyjzyj2000@xxxxxxxxx>
---
drivers/infiniband/sw/rxe/rxe_net.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c
b/drivers/infiniband/sw/rxe/rxe_net.c
index 0701bd1ffd1a..6ef092cb575e 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -72,6 +72,11 @@ static struct dst_entry *rxe_find_route6(struct
net_device *ndev,
struct dst_entry *ndst;
struct flowi6 fl6 = { { 0 } };
+ if (!ipv6_mod_enabled()) {
+ pr_info("IPv6 is disabled by ipv6.disable=1 in cmdline");
+ return NULL;
+ }
+
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_oif = ndev->ifindex;
memcpy(&fl6.saddr, saddr, sizeof(*saddr));
@@ -608,6 +613,10 @@ static int rxe_net_ipv4_init(void)
static int rxe_net_ipv6_init(void)
{
#if IS_ENABLED(CONFIG_IPV6)
+ if (!ipv6_mod_enabled()) {
+ pr_info("IPv6 is disabled by ipv6.disable=1 in cmdline");
+ return 0;
+ }
recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
htons(ROCE_V2_UDP_DPORT), true);
--
2.25.1
On Sat, Feb 27, 2021 at 6:18 PM Yi Zhang <yi.zhang@xxxxxxxxxx> wrote:
>
>
>
> On 2/27/21 5:05 PM, Zhu Yanjun wrote:
> > On Fri, Feb 26, 2021 at 11:50 PM Yi Zhang <yi.zhang@xxxxxxxxxx> wrote:
> >> Hello
> >>
> >> I found this failure after ipv6 disabled, is that expected?
> >>
> >> # modprobe rdma_rxe
> >> modprobe: ERROR: could not insert 'rdma_rxe': Operation not permitted
> >>
> >> # dmesg
> >> [ 596.783484] rdma_rxe: failed to create udp socket. err = -97
> >> [ 596.789144] rdma_rxe: Failed to create IPv6 UDP tunnel
> > ipv6 in RXE is based on config_ipv6. If config_ipv6 is disabled. rxe
> > will not implement ipv6 features.
> > How do you disable ipv6 in your hosts?
> Sorry, I should give the detailed info, I disabled it by kernel parameter:
> # cat /proc/cmdline | grep -o ipv6.disable=1
> ipv6.disable=1
>
>
>
> > Zhu Yanjun
> >
> >> # uname -r
> >> 5.11.0
> >>
> >>
> >>
> >> Best Regards,
> >> Yi Zhang
> >>
> >>
>
