> -----Original Message----- > From: Leon Romanovsky [mailto:[email protected]] > Sent: Sunday, August 20, 2017 9:36 PM > To: Long Li <[email protected]> > Cc: Steve French <[email protected]>; [email protected]; samba- > [email protected]; [email protected]; linux- > [email protected]; Christoph Hellwig <[email protected]>; Tom Talpey > <[email protected]>; Matthew Wilcox <[email protected]>; > Long Li <[email protected]> > Subject: Re: [Patch v2 01/19] CIFS: Add RDMA mount option > > On Sun, Aug 20, 2017 at 12:04:25PM -0700, Long Li wrote: > > From: Long Li <[email protected]> > > > > Add "rdma" to CIFS mount option, which tells CIFS this is for connecting to > > a > SMB server over SMBDirect. Add checks to validate this feature is only used > on SMB 3.X dialects. > > > > To connect to SMBDirect, use "mount.cifs -o rdma,vers=3.x". > > > > Signed-off-by: Long Li <[email protected]> > > --- > > fs/cifs/cifs_debug.c | 2 ++ > > fs/cifs/cifsfs.c | 2 ++ > > fs/cifs/cifsglob.h | 3 +++ > > fs/cifs/connect.c | 25 ++++++++++++++++++++++++- > > 4 files changed, 31 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..d5d0ecd 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 +1935,21 @@ cifs_parse_mount_options(const char > *mountdata, const char *devname, > > goto cifs_parse_mount_err; > > } > > > > + if (vol->rdma) { > > + switch (vol->vals->protocol_id) { > > + case SMB30_PROT_ID: > > + case SMB302_PROT_ID: > > + case SMB311_PROT_ID: > > + break; > > In cover letter, you wrote that this option is relevant for 3.X versions, so > why > do you write explicitly versions and don't do check if (version > > SMB30_PROT_ID) ...?
Thanks for pointing it out. I will fix this. > > Thanks
