From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Chu <chu11-i2BcT+NCU+M@public.gmane.org>
Subject: Re: [infiniband-diags] [UPDATED PATCH] [3/3] support --load-cache
	in iblinkinfo and ibqueryerrors
Date: Sat, 16 Jan 2010 08:25:17 -0800
Message-ID: <1263659117.14626.12.camel@crazyclimber.llnl.gov>
References: <1263579799.15172.168.camel@auk31.llnl.gov>
	 <20100116142801.GS574@me>
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To: Sasha Khapyorsky <sashak-smomgflXvOZWk0Htik3J/w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: linux-rdma@vger.kernel.org

Hey Sasha,

answers inlined below

On Sat, 2010-01-16 at 16:28 +0200, Sasha Khapyorsky wrote:
> On 10:23 Fri 15 Jan     , Al Chu wrote:
> > Hi Sasha,
> > 
> > This adds the --load-cache options to iblinkinfo and ibqueryerrors.
> > 
> > Al
> > 
> > -- 
> > Albert Chu
> > chu11-i2BcT+NCU+M@public.gmane.org
> > Computer Scientist
> > High Performance Systems Division
> > Lawrence Livermore National Laboratory
> 
> > From: Albert Chu <chu11-i2BcT+NCU+M@public.gmane.org>
> > Date: Thu, 10 Dec 2009 11:22:50 -0800
> > Subject: [PATCH] support --load-cache in iblinkinfo and ibqueryerrors
> > 
> > 
> > Signed-off-by: Albert Chu <chu11-i2BcT+NCU+M@public.gmane.org>
> > ---
> >  infiniband-diags/man/iblinkinfo.8    |   11 ++++++-
> >  infiniband-diags/man/ibqueryerrors.8 |   10 ++++++-
> >  infiniband-diags/src/iblinkinfo.c    |   52 +++++++++++++++++++++++++-------
> >  infiniband-diags/src/ibqueryerrors.c |   53 ++++++++++++++++++++++++++-------
> >  4 files changed, 99 insertions(+), 27 deletions(-)
> > 
> > diff --git a/infiniband-diags/man/iblinkinfo.8 b/infiniband-diags/man/iblinkinfo.8
> > index 0f53b00..f184edf 100644
> > --- a/infiniband-diags/man/iblinkinfo.8
> > +++ b/infiniband-diags/man/iblinkinfo.8
> > @@ -6,7 +6,7 @@ iblinkinfo \- report link info for all links in the fabric
> >  .SH SYNOPSIS
> >  .B iblinkinfo
> >     [-hcdl -C <ca_name> -P <ca_port> -v <lt,hoq,vlstall> -S <guid>
> > --D <direct_route>]
> > +-D <direct_route> \-\-load\-cache <filename>]
> >  
> >  .SH DESCRIPTION
> >  .PP
> > @@ -42,7 +42,14 @@ Print port capabilities (enabled and supported values)
> >  \fB\-P <ca_port>\fR    use the specified ca_port for the search.
> >  .TP
> >  \fB\-R\fR (This option is obsolete and does nothing)
> > -
> > +.TP
> > +\fB\-\-load\-cache\fR <filename>
> > +Load and use the cached ibnetdiscover data stored in the specified
> > +filename.  May be useful for outputting and learning about other
> > +fabrics or a previous state of a fabric.  Cannot be used if user
> > +specifies a directo route path.  See
> > +.B ibnetdiscover
> > +for information on caching ibnetdiscover output.
> >  
> >  .SH AUTHOR
> >  .TP
> > diff --git a/infiniband-diags/man/ibqueryerrors.8 b/infiniband-diags/man/ibqueryerrors.8
> > index 83a2b5a..56a0d67 100644
> > --- a/infiniband-diags/man/ibqueryerrors.8
> > +++ b/infiniband-diags/man/ibqueryerrors.8
> > @@ -6,7 +6,7 @@ ibqueryerrors \- query and report non-zero IB port counters
> >  .SH SYNOPSIS
> >  .B ibqueryerrors
> >  [-s <err1,err2,...> -c -r -C <ca_name> -P <ca_port> -G <node_guid>
> > --D <direct_route> -d -k -K]
> > +-D <direct_route> -d -k -K \-\-load\-cache <filename>]
> >  
> >  .SH DESCRIPTION
> >  .PP
> > @@ -60,6 +60,14 @@ specified the data counters will be cleared without any printed output.
> >  .TP
> >  \fB\-\-details\fR include transmit discard details
> >  .TP
> > +\fB\-\-load\-cache\fR <filename>
> > +Load and use the cached ibnetdiscover data stored in the specified
> > +filename.  May be useful for outputting and learning about other
> > +fabrics or a previous state of a fabric.  Cannot be used if user
> > +specifies a directo route path.  See
> > +.B ibnetdiscover
> > +for information on caching ibnetdiscover output.
> > +.TP
> >  \fB\-R\fR  (This option is obsolete and does nothing)
> >  
> >  .SH COMMON OPTIONS
> > diff --git a/infiniband-diags/src/iblinkinfo.c b/infiniband-diags/src/iblinkinfo.c
> > index 21b31bb..10e3ad5 100644
> > --- a/infiniband-diags/src/iblinkinfo.c
> > +++ b/infiniband-diags/src/iblinkinfo.c
> > @@ -55,6 +55,7 @@
> >  
> >  static char *node_name_map_file = NULL;
> >  static nn_map_t *node_name_map = NULL;
> > +static char *load_cache_file = NULL;
> >  
> >  static uint64_t guid = 0;
> >  static char *guid_str = NULL;
> > @@ -230,6 +231,9 @@ static int process_opt(void *context, int ch, char *optarg)
> >  	case 1:
> >  		node_name_map_file = strdup(optarg);
> >  		break;
> > +	case 2:
> > +		load_cache_file = strdup(optarg);
> > +		break;
> >  	case 'S':
> >  		guid_str = optarg;
> >  		guid = (uint64_t) strtoull(guid_str, 0, 0);
> > @@ -291,6 +295,7 @@ int main(int argc, char **argv)
> >  		 "print additional switch settings (PktLifeTime, HoqLife, VLStallCount)"},
> >  		{"portguids", 'g', 0, NULL,
> >  		 "print port guids instead of node guids"},
> > +		{"load-cache", 2, 1, "<file>", "filename of ibnetdiscover cache to load"},
> >  		{"GNDN", 'R', 0, NULL,
> >  		 "(This option is obsolete and does nothing)"},
> >  		{0}
> > @@ -317,6 +322,11 @@ int main(int argc, char **argv)
> >  		mad_rpc_set_timeout(ibmad_port, ibd_timeout);
> >  
> >  	node_name_map = open_node_name_map(node_name_map_file);
> > +	
> > +	if (dr_path && load_cache_file) {
> > +		fprintf(stderr, "Cannot specify cache and direct route path\n");
> > +		exit(1);
> > +	}
> 
> Why is this limitation needed really?

I spoke to Ira about it awhile ago.  I think what we decided was that
while technically you can do a DR path, b/c you can load a cache from
anywhere in the cluster, you won't know if the DR path is legal or
correct at point A vs point B.  In contrast, the node_guid input is
valid anywhere you are on the cluster.

I suppose we could just allow it and the user has to understand this
fact??

> >  
> >  	if (dr_path) {
> >  		/* only scan part of the fabric */
> > @@ -334,19 +344,37 @@ int main(int argc, char **argv)
> >  			       guid_str);
> >  	}
> >  
> > -	if (resolved >= 0)
> > -		if ((fabric = ibnd_discover_fabric(ibmad_port, &port_id,
> > -						   hops)) == NULL)
> > -			IBWARN
> > -			    ("Single node discover failed; attempting full scan\n");
> > -
> > -	if (!fabric)
> > -		if ((fabric =
> > -		     ibnd_discover_fabric(ibmad_port, NULL, -1)) == NULL) {
> > -			fprintf(stderr, "discover failed\n");
> > -			rc = 1;
> > -			goto close_port;
> > +	if (resolved >= 0) {
> > +		if (load_cache_file) {
> > +			if ((fabric = ibnd_load_fabric(load_cache_file, 0)) == NULL) {
> > +				fprintf(stderr, "loading cached fabric failed\n");
> > +				exit(1);
> > +			}
> > +		}
> > +		else {
> > +			if ((fabric = ibnd_discover_fabric(ibmad_port, &port_id,
> > +							   hops)) == NULL)
> > +				IBWARN
> > +				    ("Single node discover failed; attempting full scan\n");
> > +		}
> > +	}
> > +
> > +	if (!fabric) {
> > +		if (load_cache_file) {
> > +			if ((fabric = ibnd_load_fabric(load_cache_file, 0)) == NULL) {
> > +				fprintf(stderr, "loading cached fabric failed\n");
> > +				exit(1);
> > +			}
> >  		}
> > +		else {
> > +			if ((fabric =
> > +		     		ibnd_discover_fabric(ibmad_port, NULL, -1)) == NULL) {
> > +					fprintf(stderr, "discover failed\n");
> > +					rc = 1;
> > +					goto close_port;
> > +			}
> > +		}
> > +	}
> 
> It doesn't look so simple for me. In case when '-S' or '-D' are used the
> information is requested for only specific node. So the flow of initial
> discovery (above) would likely look as:
> 
> 	if (load_cache_file)
> 		load_fabric_from_cache();
> 	else {
> 		if (resloved)
> 			fabric = single_node_discovery();
> 		if (!fabric)
> 			fabric = full_fabric_discovery();
> 	}
> 
> 	....
> 
> Correct?

Yeah, I can make it simpler.  I will submit a new patch on Monday.

> >  
> >  	if (!all && guid_str) {
> >  		ibnd_node_t *sw = ibnd_find_node_guid(fabric, guid);
> > diff --git a/infiniband-diags/src/ibqueryerrors.c b/infiniband-diags/src/ibqueryerrors.c
> > index 47bd2af..3ed0ed1 100644
> > --- a/infiniband-diags/src/ibqueryerrors.c
> > +++ b/infiniband-diags/src/ibqueryerrors.c
> > @@ -58,6 +58,8 @@
> >  struct ibmad_port *ibmad_port;
> >  static char *node_name_map_file = NULL;
> >  static nn_map_t *node_name_map = NULL;
> > +static char *load_cache_file = NULL;
> > +
> >  int data_counters = 0;
> >  int port_config = 0;
> >  uint64_t node_guid = 0;
> > @@ -481,6 +483,9 @@ static int process_opt(void *context, int ch, char *optarg)
> >  	case 6:
> >  		details = 1;
> >  		break;
> > +	case 7:
> > +		load_cache_file = strdup(optarg);
> > +		break;
> >  	case 'G':
> >  	case 'S':
> >  		node_guid_str = optarg;
> > @@ -542,6 +547,7 @@ int main(int argc, char **argv)
> >  		 "Clear error counters after read"},
> >  		{"clear-counts", 'K', 0, NULL,
> >  		 "Clear data counters after read"},
> > +		{"load-cache", 7, 1, "<file>", "filename of ibnetdiscover cache to load"},
> >  		{0}
> >  	};
> >  	char usage_args[] = "";
> > @@ -568,6 +574,11 @@ int main(int argc, char **argv)
> >  
> >  	node_name_map = open_node_name_map(node_name_map_file);
> >  
> > +	if (dr_path && load_cache_file) {
> > +		fprintf(stderr, "Cannot specify cache and direct route path\n");
> > +		exit(1);
> > +	}
> > +
> >  	/* limit the scan the fabric around the target */
> >  	if (dr_path) {
> >  		if ((resolved =
> > @@ -584,19 +595,37 @@ int main(int argc, char **argv)
> >  			       node_guid_str);
> >  	}
> >  
> > -	if (resolved >= 0)
> > -		if ((fabric = ibnd_discover_fabric(ibmad_port, &portid,
> > -						   0)) == NULL)
> > -			IBWARN
> > -			    ("Single node discover failed; attempting full scan");
> > -
> > -	if (!fabric)		/* do a full scan */
> > -		if ((fabric =
> > -		     ibnd_discover_fabric(ibmad_port, NULL, -1)) == NULL) {
> > -			fprintf(stderr, "discover failed\n");
> > -			rc = 1;
> > -			goto close_port;
> > +	if (resolved >= 0) {
> > +		if (load_cache_file) {
> > +			if ((fabric = ibnd_load_fabric(load_cache_file, 0)) == NULL) {
> > +				fprintf(stderr, "loading cached fabric failed\n");
> > +				exit(1);
> > +			}
> > +		}
> > +		else {
> > +			if ((fabric = ibnd_discover_fabric(ibmad_port, &portid,
> > +							   0)) == NULL)
> > +				IBWARN
> > +				    ("Single node discover failed; attempting full scan");
> >  		}
> > +	}
> > +
> > +	if (!fabric) {		/* do a full scan */
> > +		if (load_cache_file) {
> > +			if ((fabric = ibnd_load_fabric(load_cache_file, 0)) == NULL) {
> > +				fprintf(stderr, "loading cached fabric failed\n");
> > +				exit(1);
> > +			}
> > +		}
> > +		else {
> > +			if ((fabric =
> > +			     ibnd_discover_fabric(ibmad_port, NULL, -1)) == NULL) {
> > +				fprintf(stderr, "discover failed\n");
> > +				rc = 1;
> > +				goto close_port;
> > +			}
> > +		}
> > +	}
> 
> Ditto.

Yup, I'll submit a new patch on Monday.

> Sasha
> 
> >  
> >  	report_suppressed();
> >  
> > -- 
> > 1.5.4.5
> > 
> 
-- 
Albert Chu
chu11-i2BcT+NCU+M@public.gmane.org
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory

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