diff mbox series

[v5,08/21] CIFS: SMBD: Upper layer reconnects to SMB Direct session

Message ID 20171018230920.21042-9-longli@exchange.microsoft.com
State New
Headers show
Series CIFS: Implement SMB Direct protocol | expand

Commit Message

Long Li Oct. 18, 2017, 11:09 p.m. UTC 
From: Long Li <longli@microsoft.com>

Do a reconnect on SMB Direct when it is used as the connection. Reconnect can
happen for many reasons and it's mostly the decision of SMB2 upper layer.

Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/connect.c | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Pavel Shilovsky Nov. 1, 2017, 6:04 p.m. UTC | #1 
2017-10-18 16:09 GMT-07:00 Long Li <longli@exchange.microsoft.com>:
> From: Long Li <longli@microsoft.com>
>
> Do a reconnect on SMB Direct when it is used as the connection. Reconnect can
> happen for many reasons and it's mostly the decision of SMB2 upper layer.
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
>  fs/cifs/connect.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 2c0b34a..8ca3c13 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info *server)
>
>                 /* we should try only the port we connected to before */
>                 mutex_lock(&server->srv_mutex);
> +#ifdef CONFIG_CIFS_SMB_DIRECT
> +               if (server->rdma)
> +                       rc = smbd_reconnect(server);
> +               else
> +                       rc = generic_ip_connect(server);

Minor: here and in other similar places we can remove #else part below
and put #endif before else block above.

> +#else
>                 rc = generic_ip_connect(server);
> +#endif
>                 if (rc) {
>                         cifs_dbg(FYI, "reconnect error %d\n", rc);
>                         mutex_unlock(&server->srv_mutex);
> --
> 2.7.4
>
> --
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--
Best regards,
Pavel Shilovsky
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Matthew Wilcox Nov. 1, 2017, 7:44 p.m. UTC | #2 
From: Pavel Shilovsky [mailto:piastryyy@gmail.com]

> 2017-10-18 16:09 GMT-07:00 Long Li <longli@exchange.microsoft.com>:

> > From: Long Li <longli@microsoft.com>

> >

> > Do a reconnect on SMB Direct when it is used as the connection. Reconnect

> can

> > happen for many reasons and it's mostly the decision of SMB2 upper layer.

> >

> > Signed-off-by: Long Li <longli@microsoft.com>

> > ---

> >  fs/cifs/connect.c | 7 +++++++

> >  1 file changed, 7 insertions(+)

> >

> > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c

> > index 2c0b34a..8ca3c13 100644

> > --- a/fs/cifs/connect.c

> > +++ b/fs/cifs/connect.c

> > @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info *server)

> >

> >                 /* we should try only the port we connected to before */

> >                 mutex_lock(&server->srv_mutex);

> > +#ifdef CONFIG_CIFS_SMB_DIRECT

> > +               if (server->rdma)

> > +                       rc = smbd_reconnect(server);

> > +               else

> > +                       rc = generic_ip_connect(server);

> 

> Minor: here and in other similar places we can remove #else part below

> and put #endif before else block above.

> 

> > +#else

> >                 rc = generic_ip_connect(server);

> > +#endif


I'd suggest rather:

#ifdef CONFIG_CIFS_SMB_DIRECT
#define cifs_rdma_enabled(server)	((server)->rdma)
#else
#define cifs_rdma_enabled(server)	0
#endif

Then we don't need an ifdef in the users, just:

	if (cifs_rdma_enabled(server))
		rc = smbd_reconnect(server);
	else
		rc = generic_ip_connect(server);
Long Li Nov. 5, 2017, 6:37 p.m. UTC | #3 
> -----Original Message-----

> From: Matthew Wilcox

> Sent: Wednesday, November 1, 2017 12:45 PM

> To: Pavel Shilovsky <piastryyy@gmail.com>; Long Li <longli@microsoft.com>

> Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-

> cifs@vger.kernel.org>; samba-technical <samba-technical@lists.samba.org>;

> Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-

> rdma@vger.kernel.org; Tom Talpey <ttalpey@microsoft.com>; Stephen

> Hemminger <sthemmin@microsoft.com>; Long Li <longli@microsoft.com>

> Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to SMB

> Direct session

> 

> From: Pavel Shilovsky [mailto:piastryyy@gmail.com]

> > 2017-10-18 16:09 GMT-07:00 Long Li <longli@exchange.microsoft.com>:

> > > From: Long Li <longli@microsoft.com>

> > >

> > > Do a reconnect on SMB Direct when it is used as the connection.

> > > Reconnect

> > can

> > > happen for many reasons and it's mostly the decision of SMB2 upper

> layer.

> > >

> > > Signed-off-by: Long Li <longli@microsoft.com>

> > > ---

> > >  fs/cifs/connect.c | 7 +++++++

> > >  1 file changed, 7 insertions(+)

> > >

> > > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index

> > > 2c0b34a..8ca3c13 100644

> > > --- a/fs/cifs/connect.c

> > > +++ b/fs/cifs/connect.c

> > > @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info *server)

> > >

> > >                 /* we should try only the port we connected to before */

> > >                 mutex_lock(&server->srv_mutex);

> > > +#ifdef CONFIG_CIFS_SMB_DIRECT

> > > +               if (server->rdma)

> > > +                       rc = smbd_reconnect(server);

> > > +               else

> > > +                       rc = generic_ip_connect(server);

> >

> > Minor: here and in other similar places we can remove #else part below

> > and put #endif before else block above.

> >

> > > +#else

> > >                 rc = generic_ip_connect(server);

> > > +#endif

> 

> I'd suggest rather:

> 

> #ifdef CONFIG_CIFS_SMB_DIRECT

> #define cifs_rdma_enabled(server)	((server)->rdma)

> #else

> #define cifs_rdma_enabled(server)	0

> #endif

> 

> Then we don't need an ifdef in the users, just:

> 

> 	if (cifs_rdma_enabled(server))

> 		rc = smbd_reconnect(server);

> 	else

> 		rc = generic_ip_connect(server);


I will fix this. Thank you.

Long
Long Li Nov. 5, 2017, 7:19 p.m. UTC | #4 
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Matthew Wilcox Nov. 6, 2017, 6:10 p.m. UTC | #5 
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Long Li Nov. 6, 2017, 6:59 p.m. UTC | #6 
> -----Original Message-----

> From: Matthew Wilcox

> Sent: Monday, November 6, 2017 10:10 AM

> To: Long Li <longli@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to SMB

> Direct session

> 

> Oh, I hadn't noticed that.  Then I amend my suggestion to be:

> 

> #ifdef CONFIG_CIFS_SMB_DIRECT

> #define cifs_rdma_enabled(server)	((server)->rdma)

> #else

> #define cifs_rdma_enabled(server)	0

> static inline void cifs_reconnect(struct TCP_Server_Info *server) { } #endif


I will address those and update patch.

> 

> > -----Original Message-----

> > From: Long Li

> > Sent: Sunday, November 5, 2017 2:20 PM

> > To: Long Li <longli@microsoft.com>; Matthew Wilcox

> > <mawilcox@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> > List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > SMB Direct session

> >

> >

> >

> > > -----Original Message-----

> > > From: samba-technical

> > > [mailto:samba-technical-bounces@lists.samba.org]

> > > On Behalf Of Long Li via samba-technical

> > > Sent: Sunday, November 5, 2017 10:37 AM

> > > To: Matthew Wilcox <mawilcox@microsoft.com>; Pavel Shilovsky

> > > <piastryyy@gmail.com>

> > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org;

> > > samba-technical <samba-technical@lists.samba.org>; Kernel Mailing

> > > List <linux- kernel@vger.kernel.org>; Steve French

> > > <sfrench@samba.org>

> > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > > SMB Direct session

> > >

> > > > -----Original Message-----

> > > > From: Matthew Wilcox

> > > > Sent: Wednesday, November 1, 2017 12:45 PM

> > > > To: Pavel Shilovsky <piastryyy@gmail.com>; Long Li

> > > > <longli@microsoft.com>

> > > > Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-

> > > > cifs@vger.kernel.org>; samba-technical

> > > > <samba-technical@lists.samba.org>;

> > > > Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-

> > > > rdma@vger.kernel.org; Tom Talpey <ttalpey@microsoft.com>;

> Stephen

> > > > Hemminger <sthemmin@microsoft.com>; Long Li

> <longli@microsoft.com>

> > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects

> > > > to SMB Direct session

> > > >

> > > > From: Pavel Shilovsky [mailto:piastryyy@gmail.com]

> > > > > 2017-10-18 16:09 GMT-07:00 Long Li

> <longli@exchange.microsoft.com>:

> > > > > > From: Long Li <longli@microsoft.com>

> > > > > >

> > > > > > Do a reconnect on SMB Direct when it is used as the connection.

> > > > > > Reconnect

> > > > > can

> > > > > > happen for many reasons and it's mostly the decision of SMB2

> > > > > > upper

> > > > layer.

> > > > > >

> > > > > > Signed-off-by: Long Li <longli@microsoft.com>

> > > > > > ---

> > > > > >  fs/cifs/connect.c | 7 +++++++

> > > > > >  1 file changed, 7 insertions(+)

> > > > > >

> > > > > > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index

> > > > > > 2c0b34a..8ca3c13 100644

> > > > > > --- a/fs/cifs/connect.c

> > > > > > +++ b/fs/cifs/connect.c

> > > > > > @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info

> > > > > > *server)

> > > > > >

> > > > > >                 /* we should try only the port we connected to before */

> > > > > >                 mutex_lock(&server->srv_mutex);

> > > > > > +#ifdef CONFIG_CIFS_SMB_DIRECT

> > > > > > +               if (server->rdma)

> > > > > > +                       rc = smbd_reconnect(server);

> > > > > > +               else

> > > > > > +                       rc = generic_ip_connect(server);

> > > > >

> > > > > Minor: here and in other similar places we can remove #else part

> > > > > below and put #endif before else block above.

> > > > >

> > > > > > +#else

> > > > > >                 rc = generic_ip_connect(server);

> > > > > > +#endif

> > > >

> > > > I'd suggest rather:

> > > >

> > > > #ifdef CONFIG_CIFS_SMB_DIRECT

> > > > #define cifs_rdma_enabled(server)	((server)->rdma)

> > > > #else

> > > > #define cifs_rdma_enabled(server)	0

> > > > #endif

> > > >

> > > > Then we don't need an ifdef in the users, just:

> > > >

> > > > 	if (cifs_rdma_enabled(server))

> > > > 		rc = smbd_reconnect(server);

> > > > 	else

> > > > 		rc = generic_ip_connect(server);

> >

> > It doesn't work well, because smbd_reconnect is defined when

> > CONFIG_CIFS_SMB_DIRECT is set. Now the compiler is complaining it

> > can't find this function. Maybe compiler is not smart enough :)

> >

> > I have sent v6 for all the other comments.
Tom Talpey Nov. 6, 2017, 8:25 p.m. UTC | #7 
> -----Original Message-----

> From: linux-cifs-owner@vger.kernel.org [mailto:linux-cifs-

> owner@vger.kernel.org] On Behalf Of Long Li

> Sent: Monday, November 6, 2017 2:00 PM

> To: Matthew Wilcox <mawilcox@microsoft.com>; Pavel Shilovsky

> <piastryyy@gmail.com>

> Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing List

> <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to SMB

> Direct session

> 

> > -----Original Message-----

> > From: Matthew Wilcox

> > Sent: Monday, November 6, 2017 10:10 AM

> > To: Long Li <longli@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> > List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to SMB

> > Direct session

> >

> > Oh, I hadn't noticed that.  Then I amend my suggestion to be:

> >

> > #ifdef CONFIG_CIFS_SMB_DIRECT

> > #define cifs_rdma_enabled(server)	((server)->rdma)

> > #else

> > #define cifs_rdma_enabled(server)	0

> > static inline void cifs_reconnect(struct TCP_Server_Info *server) { } #endif

> 

> I will address those and update patch.


I don't think stubbing such a generic-looking function cifs_reconnect() under an RDMA conditional is a good idea. It would seem to hide what's truly going on, and deeply confuse someone who tried to code cifs_reconnect() on any other code path, thinking it would, well, reconnect.

How about cifs_rdma_reconnect()? That would be fine to override.

Tom.

> 

> >

> > > -----Original Message-----

> > > From: Long Li

> > > Sent: Sunday, November 5, 2017 2:20 PM

> > > To: Long Li <longli@microsoft.com>; Matthew Wilcox

> > > <mawilcox@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> > > List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > > SMB Direct session

> > >

> > >

> > >

> > > > -----Original Message-----

> > > > From: samba-technical

> > > > [mailto:samba-technical-bounces@lists.samba.org]

> > > > On Behalf Of Long Li via samba-technical

> > > > Sent: Sunday, November 5, 2017 10:37 AM

> > > > To: Matthew Wilcox <mawilcox@microsoft.com>; Pavel Shilovsky

> > > > <piastryyy@gmail.com>

> > > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org;

> > > > samba-technical <samba-technical@lists.samba.org>; Kernel Mailing

> > > > List <linux- kernel@vger.kernel.org>; Steve French

> > > > <sfrench@samba.org>

> > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > > > SMB Direct session

> > > >

> > > > > -----Original Message-----

> > > > > From: Matthew Wilcox

> > > > > Sent: Wednesday, November 1, 2017 12:45 PM

> > > > > To: Pavel Shilovsky <piastryyy@gmail.com>; Long Li

> > > > > <longli@microsoft.com>

> > > > > Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-

> > > > > cifs@vger.kernel.org>; samba-technical

> > > > > <samba-technical@lists.samba.org>;

> > > > > Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-

> > > > > rdma@vger.kernel.org; Tom Talpey <ttalpey@microsoft.com>;

> > Stephen

> > > > > Hemminger <sthemmin@microsoft.com>; Long Li

> > <longli@microsoft.com>

> > > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects

> > > > > to SMB Direct session

> > > > >

> > > > > From: Pavel Shilovsky [mailto:piastryyy@gmail.com]

> > > > > > 2017-10-18 16:09 GMT-07:00 Long Li

> > <longli@exchange.microsoft.com>:

> > > > > > > From: Long Li <longli@microsoft.com>

> > > > > > >

> > > > > > > Do a reconnect on SMB Direct when it is used as the connection.

> > > > > > > Reconnect

> > > > > > can

> > > > > > > happen for many reasons and it's mostly the decision of SMB2

> > > > > > > upper

> > > > > layer.

> > > > > > >

> > > > > > > Signed-off-by: Long Li <longli@microsoft.com>

> > > > > > > ---

> > > > > > >  fs/cifs/connect.c | 7 +++++++

> > > > > > >  1 file changed, 7 insertions(+)

> > > > > > >

> > > > > > > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index

> > > > > > > 2c0b34a..8ca3c13 100644

> > > > > > > --- a/fs/cifs/connect.c

> > > > > > > +++ b/fs/cifs/connect.c

> > > > > > > @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info

> > > > > > > *server)

> > > > > > >

> > > > > > >                 /* we should try only the port we connected to before */

> > > > > > >                 mutex_lock(&server->srv_mutex);

> > > > > > > +#ifdef CONFIG_CIFS_SMB_DIRECT

> > > > > > > +               if (server->rdma)

> > > > > > > +                       rc = smbd_reconnect(server);

> > > > > > > +               else

> > > > > > > +                       rc = generic_ip_connect(server);

> > > > > >

> > > > > > Minor: here and in other similar places we can remove #else part

> > > > > > below and put #endif before else block above.

> > > > > >

> > > > > > > +#else

> > > > > > >                 rc = generic_ip_connect(server);

> > > > > > > +#endif

> > > > >

> > > > > I'd suggest rather:

> > > > >

> > > > > #ifdef CONFIG_CIFS_SMB_DIRECT

> > > > > #define cifs_rdma_enabled(server)	((server)->rdma)

> > > > > #else

> > > > > #define cifs_rdma_enabled(server)	0

> > > > > #endif

> > > > >

> > > > > Then we don't need an ifdef in the users, just:

> > > > >

> > > > > 	if (cifs_rdma_enabled(server))

> > > > > 		rc = smbd_reconnect(server);

> > > > > 	else

> > > > > 		rc = generic_ip_connect(server);

> > >

> > > It doesn't work well, because smbd_reconnect is defined when

> > > CONFIG_CIFS_SMB_DIRECT is set. Now the compiler is complaining it

> > > can't find this function. Maybe compiler is not smart enough :)

> > >

> > > I have sent v6 for all the other comments.

> ��칻�&�~�&���+-

> ��ݶ��w��˛���m�b��\��"��^n�r���z���h����&���G���h�(�階

> �ݢj"���m�����z�ޖ���f���h���~�m�
Long Li Nov. 6, 2017, 8:46 p.m. UTC | #8 
> -----Original Message-----

> From: Tom Talpey

> Sent: Monday, November 6, 2017 12:26 PM

> To: Long Li <longli@microsoft.com>; Matthew Wilcox

> <mawilcox@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to SMB

> Direct session

> 

> > -----Original Message-----

> > From: linux-cifs-owner@vger.kernel.org [mailto:linux-cifs-

> > owner@vger.kernel.org] On Behalf Of Long Li

> > Sent: Monday, November 6, 2017 2:00 PM

> > To: Matthew Wilcox <mawilcox@microsoft.com>; Pavel Shilovsky

> > <piastryyy@gmail.com>

> > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel Mailing

> > List <linux-kernel@vger.kernel.org>; Steve French <sfrench@samba.org>

> > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > SMB Direct session

> >

> > > -----Original Message-----

> > > From: Matthew Wilcox

> > > Sent: Monday, November 6, 2017 10:10 AM

> > > To: Long Li <longli@microsoft.com>; Pavel Shilovsky

> > > <piastryyy@gmail.com>

> > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel

> Mailing

> > > List <linux-kernel@vger.kernel.org>; Steve French

> > > <sfrench@samba.org>

> > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects to

> > > SMB Direct session

> > >

> > > Oh, I hadn't noticed that.  Then I amend my suggestion to be:

> > >

> > > #ifdef CONFIG_CIFS_SMB_DIRECT

> > > #define cifs_rdma_enabled(server)	((server)->rdma)

> > > #else

> > > #define cifs_rdma_enabled(server)	0

> > > static inline void cifs_reconnect(struct TCP_Server_Info *server) {

> > > } #endif

> >

> > I will address those and update patch.

> 

> I don't think stubbing such a generic-looking function cifs_reconnect() under

> an RDMA conditional is a good idea. It would seem to hide what's truly going

> on, and deeply confuse someone who tried to code cifs_reconnect() on any

> other code path, thinking it would, well, reconnect.

> 

> How about cifs_rdma_reconnect()? That would be fine to override.


Yes this makes more sense, this is the approach I'm going to code.

> 

> Tom.

> 

> >

> > >

> > > > -----Original Message-----

> > > > From: Long Li

> > > > Sent: Sunday, November 5, 2017 2:20 PM

> > > > To: Long Li <longli@microsoft.com>; Matthew Wilcox

> > > > <mawilcox@microsoft.com>; Pavel Shilovsky <piastryyy@gmail.com>

> > > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org; Kernel

> > > > Mailing List <linux-kernel@vger.kernel.org>; Steve French

> > > > <sfrench@samba.org>

> > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects

> > > > to SMB Direct session

> > > >

> > > >

> > > >

> > > > > -----Original Message-----

> > > > > From: samba-technical

> > > > > [mailto:samba-technical-bounces@lists.samba.org]

> > > > > On Behalf Of Long Li via samba-technical

> > > > > Sent: Sunday, November 5, 2017 10:37 AM

> > > > > To: Matthew Wilcox <mawilcox@microsoft.com>; Pavel Shilovsky

> > > > > <piastryyy@gmail.com>

> > > > > Cc: linux-cifs <linux-cifs@vger.kernel.org>; Stephen Hemminger

> > > > > <sthemmin@microsoft.com>; linux-rdma@vger.kernel.org;

> > > > > samba-technical <samba-technical@lists.samba.org>; Kernel

> > > > > Mailing List <linux- kernel@vger.kernel.org>; Steve French

> > > > > <sfrench@samba.org>

> > > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer reconnects

> > > > > to SMB Direct session

> > > > >

> > > > > > -----Original Message-----

> > > > > > From: Matthew Wilcox

> > > > > > Sent: Wednesday, November 1, 2017 12:45 PM

> > > > > > To: Pavel Shilovsky <piastryyy@gmail.com>; Long Li

> > > > > > <longli@microsoft.com>

> > > > > > Cc: Steve French <sfrench@samba.org>; linux-cifs <linux-

> > > > > > cifs@vger.kernel.org>; samba-technical

> > > > > > <samba-technical@lists.samba.org>;

> > > > > > Kernel Mailing List <linux-kernel@vger.kernel.org>; linux-

> > > > > > rdma@vger.kernel.org; Tom Talpey <ttalpey@microsoft.com>;

> > > Stephen

> > > > > > Hemminger <sthemmin@microsoft.com>; Long Li

> > > <longli@microsoft.com>

> > > > > > Subject: RE: [Patch v5 08/21] CIFS: SMBD: Upper layer

> > > > > > reconnects to SMB Direct session

> > > > > >

> > > > > > From: Pavel Shilovsky [mailto:piastryyy@gmail.com]

> > > > > > > 2017-10-18 16:09 GMT-07:00 Long Li

> > > <longli@exchange.microsoft.com>:

> > > > > > > > From: Long Li <longli@microsoft.com>

> > > > > > > >

> > > > > > > > Do a reconnect on SMB Direct when it is used as the connection.

> > > > > > > > Reconnect

> > > > > > > can

> > > > > > > > happen for many reasons and it's mostly the decision of

> > > > > > > > SMB2 upper

> > > > > > layer.

> > > > > > > >

> > > > > > > > Signed-off-by: Long Li <longli@microsoft.com>

> > > > > > > > ---

> > > > > > > >  fs/cifs/connect.c | 7 +++++++

> > > > > > > >  1 file changed, 7 insertions(+)

> > > > > > > >

> > > > > > > > diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index

> > > > > > > > 2c0b34a..8ca3c13 100644

> > > > > > > > --- a/fs/cifs/connect.c

> > > > > > > > +++ b/fs/cifs/connect.c

> > > > > > > > @@ -406,7 +406,14 @@ cifs_reconnect(struct TCP_Server_Info

> > > > > > > > *server)

> > > > > > > >

> > > > > > > >                 /* we should try only the port we connected to before

> */

> > > > > > > >                 mutex_lock(&server->srv_mutex);

> > > > > > > > +#ifdef CONFIG_CIFS_SMB_DIRECT

> > > > > > > > +               if (server->rdma)

> > > > > > > > +                       rc = smbd_reconnect(server);

> > > > > > > > +               else

> > > > > > > > +                       rc = generic_ip_connect(server);

> > > > > > >

> > > > > > > Minor: here and in other similar places we can remove #else

> > > > > > > part below and put #endif before else block above.

> > > > > > >

> > > > > > > > +#else

> > > > > > > >                 rc = generic_ip_connect(server);

> > > > > > > > +#endif

> > > > > >

> > > > > > I'd suggest rather:

> > > > > >

> > > > > > #ifdef CONFIG_CIFS_SMB_DIRECT

> > > > > > #define cifs_rdma_enabled(server)	((server)->rdma)

> > > > > > #else

> > > > > > #define cifs_rdma_enabled(server)	0

> > > > > > #endif

> > > > > >

> > > > > > Then we don't need an ifdef in the users, just:

> > > > > >

> > > > > > 	if (cifs_rdma_enabled(server))

> > > > > > 		rc = smbd_reconnect(server);

> > > > > > 	else

> > > > > > 		rc = generic_ip_connect(server);

> > > >

> > > > It doesn't work well, because smbd_reconnect is defined when

> > > > CONFIG_CIFS_SMB_DIRECT is set. Now the compiler is complaining it

> > > > can't find this function. Maybe compiler is not smart enough :)

> > > >

> > > > I have sent v6 for all the other comments.

> >   칻 & ~ &   +-

> >   ݶ  w  ˛   m b  \  "  ^n r   z   h    &   G   h ( 階

> >  ݢj"   m     z ޖ   f   h   ~ m
diff mbox series

Patch

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 2c0b34a..8ca3c13 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -406,7 +406,14 @@  cifs_reconnect(struct TCP_Server_Info *server)
 
 		/* we should try only the port we connected to before */
 		mutex_lock(&server->srv_mutex);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+		if (server->rdma)
+			rc = smbd_reconnect(server);
+		else
+			rc = generic_ip_connect(server);
+#else
 		rc = generic_ip_connect(server);
+#endif
 		if (rc) {
 			cifs_dbg(FYI, "reconnect error %d\n", rc);
 			mutex_unlock(&server->srv_mutex);