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Date: Tue, 29 Aug 2017 15:37:22 -0700
From: Pavel Shilovsky <piastryyy@...il.com>
To: Long Li <longli@...hange.microsoft.com>
Cc: Steve French <sfrench@...ba.org>,
linux-cifs <linux-cifs@...r.kernel.org>,
samba-technical <samba-technical@...ts.samba.org>,
Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-rdma@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
Tom Talpey <ttalpey@...rosoft.com>,
Matthew Wilcox <mawilcox@...rosoft.com>,
Long Li <longli@...rosoft.com>
Subject: Re: [Patch v3 01/19] CIFS: Add rdma mount option
2017-08-29 12:28 GMT-07:00 Long Li <longli@...hange.microsoft.com>:
> From: Long Li <longli@...rosoft.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@...rosoft.com>
> ---
> fs/cifs/cifs_debug.c | 2 ++
> fs/cifs/cifsfs.c | 2 ++
> fs/cifs/cifsglob.h | 3 +++
> fs/cifs/connect.c | 15 ++++++++++++++-
> 4 files changed, 21 insertions(+), 1 deletion(-)
>
> 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..703c2fb 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 +650,8 @@ 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;
> 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..19fdca8 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:
> @@ -1931,6 +1935,11 @@ 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) {
> @@ -2134,6 +2143,9 @@ 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 +2246,7 @@ 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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It is better to introduce a mount option after the functional changes
not before them. In this case we do not result in having the mount
option that does nothing if we break the patchset.
--
Best regards,
Pavel Shilovsky
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