> -----Original Message----- > From: Pavel Shilovsky [mailto:piastryyy@xxxxxxxxx] > Sent: Tuesday, August 29, 2017 3:37 PM > To: Long Li <longli@xxxxxxxxxxxxx> > Cc: Steve French <sfrench@xxxxxxxxx>; linux-cifs <linux- > cifs@xxxxxxxxxxxxxxx>; samba-technical <samba-technical@xxxxxxxxxxxxxxx>; > Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>; linux- > rdma@xxxxxxxxxxxxxxx; Christoph Hellwig <hch@xxxxxxxxxxxxx>; Tom Talpey > <ttalpey@xxxxxxxxxxxxx>; Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>; > Long Li <longli@xxxxxxxxxxxxx> > Subject: Re: [Patch v3 01/19] CIFS: Add rdma mount option > > 2017-08-29 12:28 GMT-07:00 Long Li <longli@xxxxxxxxxxxxxxxxxxxxxx>: > > From: Long Li <longli@xxxxxxxxxxxxx> > > > > 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@xxxxxxxxxxxxx> > > --- > > 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 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-cifs" > > in the body of a message to majordomo@xxxxxxxxxxxxxxx More > majordomo > > info at > > > https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvger.k > > ernel.org%2Fmajordomo- > info.html&data=02%7C01%7Clongli%40microsoft.com% > > > 7C4e70338e15204a407fd908d4ef2e855c%7C72f988bf86f141af91ab2d7cd011d > b47% > > > 7C1%7C0%7C636396430465385563&sdata=FX0HbkzueGC4ene2wItN6iCiIRqZk > 71OzY7 > > d%2FXX6rPM%3D&reserved=0 > > 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. I can move this patch to later. However it doesn’t break the build, just does nothing at all. > > -- > Best regards, > Pavel Shilovsky ��.n��������+%������w��{.n�����{���fk��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
