[PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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[PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

Samba - samba-technical mailing list
A built-in SMB file system cannot link against a modular
infiniband core module:

fs/cifs/smbdirect.o: In function `smbd_destroy_rdma_work':
smbdirect.c:(.text+0x28e3): undefined reference to `ib_drain_qp'
smbdirect.c:(.text+0x2915): undefined reference to `rdma_destroy_qp'
smbdirect.c:(.text+0x2d08): undefined reference to `ib_free_cq'
smbdirect.c:(.text+0x2d3d): undefined reference to `ib_free_cq'
smbdirect.c:(.text+0x2d6f): undefined reference to `ib_dealloc_pd'
smbdirect.c:(.text+0x2d9a): undefined reference to `rdma_destroy_id'
fs/cifs/smbdirect.o: In function `smbd_disconnect_rdma_work':
smbdirect.c:(.text+0x3d3e): undefined reference to `rdma_disconnect'
fs/cifs/smbdirect.o: In function `_smbd_get_connection':
smbdirect.c:(.text+0x5bc2): undefined reference to `rdma_create_id'
smbdirect.c:(.text+0x5cc5): undefined reference to `rdma_resolve_addr'
smbdirect.c:(.text+0x5cda): undefined reference to `rdma_destroy_id'
smbdirect.c:(.text+0x5da7): undefined reference to `rdma_destroy_id'
smbdirect.c:(.text+0x5e89): undefined reference to `rdma_resolve_route'
smbdirect.c:(.text+0x5f07): undefined reference to `rdma_destroy_id'

This changes the Kconfig dependency to enforce selecting one of the
valid configurations.

Fixes: bbc50d2ad317 ("CIFS: SMBD: Introduce kernel config option CONFIG_CIFS_SMB_DIRECT")
Signed-off-by: Arnd Bergmann <[hidden email]>
---
 fs/cifs/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 500fd69fb58b..3bfc55c08bef 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -199,6 +199,7 @@ config CIFS_SMB311
 config CIFS_SMB_DIRECT
  bool "SMB Direct support (Experimental)"
  depends on CIFS && INFINIBAND
+ depends on CIFS=m || INFINIBAND=y
  help
   Enables SMB Direct experimental support for SMB 3.0, 3.02 and 3.1.1.
   SMB Direct allows transferring SMB packets over RDMA. If unsure,
--
2.9.0


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Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

Samba - samba-technical mailing list
Hi Arnd,

> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
> index 500fd69fb58b..3bfc55c08bef 100644
> --- a/fs/cifs/Kconfig
> +++ b/fs/cifs/Kconfig
> @@ -199,6 +199,7 @@ config CIFS_SMB311
>  config CIFS_SMB_DIRECT
>   bool "SMB Direct support (Experimental)"
>   depends on CIFS && INFINIBAND
> + depends on CIFS=m || INFINIBAND=y
>   help
>    Enables SMB Direct experimental support for SMB 3.0, 3.02 and 3.1.1.
>    SMB Direct allows transferring SMB packets over RDMA. If unsure,
Is this really correct? Should CIFS_SMB_DIRECT be allowed with:

CIFS=n and INFINIBAND=y ???
or
CIFS=m and INFINIBAND=n ???

I guess a more complex logic should be used here
or am I missing something?

metze



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Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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On Tue, Dec 19, 2017 at 11:33 AM, Stefan Metzmacher <[hidden email]> wrote:

> Hi Arnd,
>
>> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
>> index 500fd69fb58b..3bfc55c08bef 100644
>> --- a/fs/cifs/Kconfig
>> +++ b/fs/cifs/Kconfig
>> @@ -199,6 +199,7 @@ config CIFS_SMB311
>>  config CIFS_SMB_DIRECT
>>       bool "SMB Direct support (Experimental)"
>>       depends on CIFS && INFINIBAND
>> +     depends on CIFS=m || INFINIBAND=y
>>       help
>>         Enables SMB Direct experimental support for SMB 3.0, 3.02 and 3.1.1.
>>         SMB Direct allows transferring SMB packets over RDMA. If unsure,
>
> Is this really correct? Should CIFS_SMB_DIRECT be allowed with:
>
> CIFS=n and INFINIBAND=y ???
> or
> CIFS=m and INFINIBAND=n ???
>
> I guess a more complex logic should be used here
> or am I missing something?

The two ones you listed are prohibited by the existing
'depends on CIFS && INFINIBAND' dependency.

We could rephrase the dependency as

depends on (CIFS=y && INFINIBAND=y) || \
            (CIFS=m && INFINIBAND=y) || \
            (CIFS=m && INFINIBAND=m)

which has the same effect as

      depends on CIFS && INFINIBAND
      depends on CIFS=m || INFINIBAND=y

but I don't think that adds any clarity.

      Arnd

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Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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Am 19.12.2017 um 11:56 schrieb Arnd Bergmann via samba-technical:

> On Tue, Dec 19, 2017 at 11:33 AM, Stefan Metzmacher <[hidden email]> wrote:
>> Hi Arnd,
>>
>>> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
>>> index 500fd69fb58b..3bfc55c08bef 100644
>>> --- a/fs/cifs/Kconfig
>>> +++ b/fs/cifs/Kconfig
>>> @@ -199,6 +199,7 @@ config CIFS_SMB311
>>>  config CIFS_SMB_DIRECT
>>>       bool "SMB Direct support (Experimental)"
>>>       depends on CIFS && INFINIBAND
>>> +     depends on CIFS=m || INFINIBAND=y
>>>       help
>>>         Enables SMB Direct experimental support for SMB 3.0, 3.02 and 3.1.1.
>>>         SMB Direct allows transferring SMB packets over RDMA. If unsure,
>>
>> Is this really correct? Should CIFS_SMB_DIRECT be allowed with:
>>
>> CIFS=n and INFINIBAND=y ???
>> or
>> CIFS=m and INFINIBAND=n ???
>>
>> I guess a more complex logic should be used here
>> or am I missing something?
>
> The two ones you listed are prohibited by the existing
> 'depends on CIFS && INFINIBAND' dependency.
>
> We could rephrase the dependency as
>
> depends on (CIFS=y && INFINIBAND=y) || \
>             (CIFS=m && INFINIBAND=y) || \
>             (CIFS=m && INFINIBAND=m)
>
> which has the same effect as
>
>       depends on CIFS && INFINIBAND
>       depends on CIFS=m || INFINIBAND=y
>
> but I don't think that adds any clarity.
Thanks for the clarification!

I somehow assumed the patch has been:


-      depends on CIFS && INFINIBAND
+      depends on CIFS=m || INFINIBAND=y

instead of:
       depends on CIFS && INFINIBAND
+      depends on CIFS=m || INFINIBAND=y

metze


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RE: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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In reply to this post by Samba - samba-technical mailing list
>   depends on CIFS && INFINIBAND
> + depends on CIFS=m || INFINIBAND=y

How about we change them to

        depends on CIFS=m && INFINIBAND || CIFS=y && INFINIBAND=y

This makes it easy to read.

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Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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Am 19.12.2017 um 22:21 schrieb Long Li via samba-technical:
>>   depends on CIFS && INFINIBAND
>> + depends on CIFS=m || INFINIBAND=y
>
> How about we change them to
>
>         depends on CIFS=m && INFINIBAND || CIFS=y && INFINIBAND=y
>
> This makes it easy to read.

I like it :-)

metze



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Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

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In reply to this post by Samba - samba-technical mailing list
On Tue, Dec 19, 2017 at 10:21 PM, Long Li <[hidden email]> wrote:
>>       depends on CIFS && INFINIBAND
>> +     depends on CIFS=m || INFINIBAND=y
>
> How about we change them to
>
>         depends on CIFS=m && INFINIBAND || CIFS=y && INFINIBAND=y
>
> This makes it easy to read.

Yes, that seems fine. I would normally group them using () to avoid
any confusion with operator precedence, but your version is
also correct, so just pick the one you like best.

       Arnd