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SubjectRe: Re: linux-next: build failure after merge of the net-next tree
-----"Jason Gunthorpe" <jgg@mellanox.com> wrote: -----

>To: "Leon Romanovsky" <leon@kernel.org>, "Bernard Metzler"
><bmt@zurich.ibm.com>
>From: "Jason Gunthorpe" <jgg@mellanox.com>
>Date: 07/10/2019 07:52PM
>Cc: "Stephen Rothwell" <sfr@canb.auug.org.au>, "Doug Ledford"
><dledford@redhat.com>, "David Miller" <davem@davemloft.net>,
>"Networking" <netdev@vger.kernel.org>, "Linux Next Mailing List"
><linux-next@vger.kernel.org>, "Linux Kernel Mailing List"
><linux-kernel@vger.kernel.org>
>Subject: [EXTERNAL] Re: linux-next: build failure after merge of the
>net-next tree
>
>On Tue, Jul 09, 2019 at 09:43:46AM +0300, Leon Romanovsky wrote:
>> On Tue, Jul 09, 2019 at 01:56:36PM +1000, Stephen Rothwell wrote:
>> > Hi all,
>> >
>> > After merging the net-next tree, today's linux-next build (x86_64
>> > allmodconfig) failed like this:
>> >
>> > drivers/infiniband/sw/siw/siw_cm.c: In function
>'siw_create_listen':
>> > drivers/infiniband/sw/siw/siw_cm.c:1978:3: error: implicit
>declaration of function 'for_ifa'; did you mean 'fork_idle'?
>[-Werror=implicit-function-declaration]
>> > for_ifa(in_dev)
>> > ^~~~~~~
>> > fork_idle
>> > drivers/infiniband/sw/siw/siw_cm.c:1978:18: error: expected ';'
>before '{' token
>> > for_ifa(in_dev)
>> > ^
>> > ;
>> > {
>> > ~
>> >
>> > Caused by commit
>> >
>> > 6c52fdc244b5 ("rdma/siw: connection management")
>> >
>> > from the rdma tree. I don't know why this didn't fail after I
>mereged
>> > that tree.
>>
>> I had the same question, because I have this fix for a couple of
>days already.
>>
>> From 56c9e15ec670af580daa8c3ffde9503af3042d67 Mon Sep 17 00:00:00
>2001
>> From: Leon Romanovsky <leonro@mellanox.com>
>> Date: Sun, 7 Jul 2019 10:43:42 +0300
>> Subject: [PATCH] Fixup to build SIW issue
>>
>> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
>> drivers/infiniband/sw/siw/siw_cm.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/infiniband/sw/siw/siw_cm.c
>b/drivers/infiniband/sw/siw/siw_cm.c
>> index 8e618cb7261f..c883bf514341 100644
>> +++ b/drivers/infiniband/sw/siw/siw_cm.c
>> @@ -1954,6 +1954,7 @@ static void siw_drop_listeners(struct
>iw_cm_id *id)
>> int siw_create_listen(struct iw_cm_id *id, int backlog)
>> {
>> struct net_device *dev = to_siw_dev(id->device)->netdev;
>> + const struct in_ifaddr *ifa;
>> int rv = 0, listeners = 0;
>>
>> siw_dbg(id->device, "id 0x%p: backlog %d\n", id, backlog);
>> @@ -1975,8 +1976,7 @@ int siw_create_listen(struct iw_cm_id *id,
>int backlog)
>> id, &s_laddr.sin_addr, ntohs(s_laddr.sin_port),
>> &s_raddr->sin_addr, ntohs(s_raddr->sin_port));
>>
>> - for_ifa(in_dev)
>> - {
>> + in_dev_for_each_ifa_rcu(ifa, in_dev) {
>> if (ipv4_is_zeronet(s_laddr.sin_addr.s_addr) ||
>
>Hum. There is no rcu lock held here and we can't use RCU anyhow as
>siw_listen_address will sleep.
>
>I think this needs to use rtnl, as below. Bernard, please urgently
>confirm. Thanks
>

Hi Jason,

That listen will not sleep. The socket is just marked
listening. Accepting a new connection is handled asynchronously
by a work handler, kicked by a socket callback
(siw_cm_llp_state_change).

But, I think you are correct, we are missing the
rcu_read_lock/unlock around that iteration. Could we please add
that (see below)?

Thanks very much!
Bernard.

diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw/siw_cm.c
index c883bf514341..c5c060103993 100644
--- a/drivers/infiniband/sw/siw/siw_cm.c
+++ b/drivers/infiniband/sw/siw/siw_cm.c
@@ -1976,6 +1976,7 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
id, &s_laddr.sin_addr, ntohs(s_laddr.sin_port),
&s_raddr->sin_addr, ntohs(s_raddr->sin_port));

+ rcu_read_lock();
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (ipv4_is_zeronet(s_laddr.sin_addr.s_addr) ||
s_laddr.sin_addr.s_addr == ifa->ifa_address) {
@@ -1988,6 +1989,7 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
listeners++;
}
}
+ rcu_read_unlock();
in_dev_put(in_dev);
} else if (id->local_addr.ss_family == AF_INET6) {
struct inet6_dev *in6_dev = in6_dev_get(dev);


>diff --git a/drivers/infiniband/sw/siw/siw_cm.c
>b/drivers/infiniband/sw/siw/siw_cm.c
>index 8e618cb7261f62..ee98e96a5bfaba 100644
>--- a/drivers/infiniband/sw/siw/siw_cm.c
>+++ b/drivers/infiniband/sw/siw/siw_cm.c
>@@ -1965,6 +1965,7 @@ int siw_create_listen(struct iw_cm_id *id, int
>backlog)
> */
> if (id->local_addr.ss_family == AF_INET) {
> struct in_device *in_dev = in_dev_get(dev);
>+ const struct in_ifaddr *ifa;
> struct sockaddr_in s_laddr, *s_raddr;
>
> memcpy(&s_laddr, &id->local_addr, sizeof(s_laddr));
>@@ -1975,8 +1976,8 @@ int siw_create_listen(struct iw_cm_id *id, int
>backlog)
> id, &s_laddr.sin_addr, ntohs(s_laddr.sin_port),
> &s_raddr->sin_addr, ntohs(s_raddr->sin_port));
>
>- for_ifa(in_dev)
>- {
>+ rtnl_lock();
>+ in_dev_for_each_ifa_rtnl(ifa, in_dev) {
> if (ipv4_is_zeronet(s_laddr.sin_addr.s_addr) ||
> s_laddr.sin_addr.s_addr == ifa->ifa_address) {
> s_laddr.sin_addr.s_addr = ifa->ifa_address;
>@@ -1988,7 +1989,7 @@ int siw_create_listen(struct iw_cm_id *id, int
>backlog)
> listeners++;
> }
> }
>- endfor_ifa(in_dev);
>+ rtnl_unlock();
> in_dev_put(in_dev);
> } else if (id->local_addr.ss_family == AF_INET6) {
> struct inet6_dev *in6_dev = in6_dev_get(dev);
>
>

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