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Subject[Patch v4 04/22] CIFS: SMBD: Add rdma mount option
Date
From: Long Li <longli@microsoft.com>

Add "rdma" to CIFS mount options to connect to SMB Direct.
Add checks to validate this is used on SMB 3.X dialects.

To connect to SMBDirect, use "mount.cifs -o rdma,vers=3.x".
At the time of this patch, 3.x can be 3.0, 3.02 or 3.1.1.

Signed-off-by: Long Li <longli@microsoft.com>
---
fs/cifs/cifs_debug.c | 2 ++
fs/cifs/cifsfs.c | 2 ++
fs/cifs/cifsglob.h | 5 +++++
fs/cifs/connect.c | 15 ++++++++++++++-
4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index bdc2f38..9738026 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 180b335..e15fbf1 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -327,6 +327,8 @@ 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 808486c..5585516 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -530,6 +530,7 @@ 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;
@@ -646,6 +647,10 @@ struct TCP_Server_Info {
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool large_buf; /* is current buffer large? */
+ /* use SMBD connection instead of socket */
+ bool rdma;
+ /* point to the SMBD connection if RDMA is used instead of socket */
+ struct smbd_connection *smbd_conn;
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 59647eb..b5a575f 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -92,7 +92,7 @@ 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,
@@ -183,6 +183,7 @@ 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" },
@@ -1538,6 +1539,9 @@ 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:
@@ -1928,6 +1932,11 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
goto cifs_parse_mount_err;
}

+ if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
+ cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
+ goto cifs_parse_mount_err;
+ }
+
#ifndef CONFIG_KEYS
/* Muliuser mounts require CONFIG_KEYS support */
if (vol->multiuser) {
@@ -2131,6 +2140,9 @@ 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;
}

@@ -2229,6 +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);
--
2.7.4
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