diff mbox

[[PATCH,v1] 01/37] [CIFS] SMBD: Add parsing for new rdma mount option

Message ID 1501704648-20159-2-git-send-email-longli@exchange.microsoft.com
State New, archived
Headers show

Commit Message

Long Li Aug. 2, 2017, 8:10 p.m. UTC
From: Long Li <longli@microsoft.com>

When doing mount with "-o rdma", user can specify this is for connecting to a SMBD session.

Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/cifs_debug.c |  2 ++
 fs/cifs/cifsfs.c     |  2 ++
 fs/cifs/cifsglob.h   |  2 ++
 fs/cifs/connect.c    | 10 +++++++++-
 4 files changed, 15 insertions(+), 1 deletion(-)

Comments

Tom Talpey Aug. 14, 2017, 7:10 p.m. UTC | #1
> -----Original Message-----
> From: linux-cifs-owner@vger.kernel.org [mailto:linux-cifs-
> owner@vger.kernel.org] On Behalf Of Long Li
> Sent: Wednesday, August 2, 2017 4:10 PM
> To: Steve French <sfrench@samba.org>; linux-cifs@vger.kernel.org; samba-
> technical@lists.samba.org; linux-kernel@vger.kernel.org
> Cc: Long Li <longli@microsoft.com>
> Subject: [[PATCH v1] 01/37] [CIFS] SMBD: Add parsing for new rdma mount
> option
> 
> From: Long Li <longli@microsoft.com>
> 
> When doing mount with "-o rdma", user can specify this is for connecting to a
> SMBD session.

Nit: it's an "SMB" session. SMBD (SMB Direct) is the transport connection.

The use of SMB Direct is only applicable when an SMB3.x dialect is negotiated.
Is there any restriction in the use of the mount option to preclude also specifying
SMB1 and SMB2.x?

Tom.
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Long Li Aug. 14, 2017, 10:53 p.m. UTC | #2
> -----Original Message-----
> From: Tom Talpey
> Sent: Monday, August 14, 2017 12:10 PM
> To: Long Li <longli@microsoft.com>; Steve French <sfrench@samba.org>;
> linux-cifs@vger.kernel.org; samba-technical@lists.samba.org; linux-
> kernel@vger.kernel.org
> Subject: RE: [[PATCH v1] 01/37] [CIFS] SMBD: Add parsing for new rdma
> mount option
> 
> > -----Original Message-----
> > From: linux-cifs-owner@vger.kernel.org [mailto:linux-cifs-
> > owner@vger.kernel.org] On Behalf Of Long Li
> > Sent: Wednesday, August 2, 2017 4:10 PM
> > To: Steve French <sfrench@samba.org>; linux-cifs@vger.kernel.org;
> > samba- technical@lists.samba.org; linux-kernel@vger.kernel.org
> > Cc: Long Li <longli@microsoft.com>
> > Subject: [[PATCH v1] 01/37] [CIFS] SMBD: Add parsing for new rdma
> > mount option
> >
> > From: Long Li <longli@microsoft.com>
> >
> > When doing mount with "-o rdma", user can specify this is for
> > connecting to a SMBD session.
> 
> Nit: it's an "SMB" session. SMBD (SMB Direct) is the transport connection.
> 
> The use of SMB Direct is only applicable when an SMB3.x dialect is negotiated.
> Is there any restriction in the use of the mount option to preclude also
> specifying
> SMB1 and SMB2.x?

SMB version is specified in mount "-o vers=XXX". For example,  "mount -o vers=3.02" will try to negotiate SMB 3.02. I will make the change to return error on vers<3.

> 
> Tom.
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diff mbox

Patch

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 9727e1d..ba0870d 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -171,6 +171,8 @@  static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 				ses->ses_count, ses->serverOS, ses->serverNOS,
 				ses->capabilities, ses->status);
 			}
+			if (server->rdma)
+				seq_printf(m, "RDMA\n\t");
 			seq_printf(m, "TCP status: %d\n\tLocal Users To "
 				   "Server: %d SecMode: 0x%x Req On Wire: %d",
 				   server->tcpStatus, server->srv_count,
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index fe0c8dc..a628800 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -330,6 +330,8 @@  cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 	default:
 		seq_puts(s, "(unknown)");
 	}
+	if (server->rdma)
+		seq_puts(s, ",rdma");
 }
 
 static void
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 8289f95..20af553 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -531,6 +531,7 @@  struct smb_vol {
 	bool nopersistent:1;
 	bool resilient:1; /* noresilient not required since not fored for CA */
 	bool domainauto:1;
+	bool rdma:1;
 	unsigned int rsize;
 	unsigned int wsize;
 	bool sockopt_tcp_nodelay:1;
@@ -649,6 +650,7 @@  struct TCP_Server_Info {
 	bool	sec_kerberos;		/* supports plain Kerberos */
 	bool	sec_mskerberos;		/* supports legacy MS Kerberos */
 	bool	large_buf;		/* is current buffer large? */
+	bool	rdma;			/* use rdma wrapper instead of socket */
 	struct delayed_work	echo; /* echo ping workqueue job */
 	char	*smallbuf;	/* pointer to current "small" buffer */
 	char	*bigbuf;	/* pointer to current "big" buffer */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 2eeaac6..0dc942c 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -94,7 +94,7 @@  enum {
 	Opt_multiuser, Opt_sloppy, Opt_nosharesock,
 	Opt_persistent, Opt_nopersistent,
 	Opt_resilient, Opt_noresilient,
-	Opt_domainauto,
+	Opt_domainauto, Opt_rdma,
 
 	/* Mount options which take numeric value */
 	Opt_backupuid, Opt_backupgid, Opt_uid,
@@ -185,6 +185,7 @@  static const match_table_t cifs_mount_option_tokens = {
 	{ Opt_resilient, "resilienthandles"},
 	{ Opt_noresilient, "noresilienthandles"},
 	{ Opt_domainauto, "domainauto"},
+	{ Opt_rdma, "rdma"},
 
 	{ Opt_backupuid, "backupuid=%s" },
 	{ Opt_backupgid, "backupgid=%s" },
@@ -1541,6 +1542,9 @@  cifs_parse_mount_options(const char *mountdata, const char *devname,
 		case Opt_domainauto:
 			vol->domainauto = true;
 			break;
+		case Opt_rdma:
+			vol->rdma = true;
+			break;
 
 		/* Numeric Values */
 		case Opt_backupuid:
@@ -2134,6 +2138,9 @@  static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
 	if (server->echo_interval != vol->echo_interval * HZ)
 		return 0;
 
+	if (server->rdma != vol->rdma)
+		return 0;
+
 	return 1;
 }
 
@@ -2234,6 +2241,7 @@  cifs_get_tcp_session(struct smb_vol *volume_info)
 	tcp_ses->noblocksnd = volume_info->noblocksnd;
 	tcp_ses->noautotune = volume_info->noautotune;
 	tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
+	tcp_ses->rdma = volume_info->rdma;
 	tcp_ses->in_flight = 0;
 	tcp_ses->credits = 1;
 	init_waitqueue_head(&tcp_ses->response_q);