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/*
* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <string.h>
#include <byteswap.h>
#include <errno.h>
#include <gpxe/infiniband.h>
#include <gpxe/ib_gma.h>
#include <gpxe/ib_pathrec.h>
/** @file
*
* Infiniband path lookups
*
*/
/** Number of path record cache entries
*
* Must be a power of two.
*/
#define IB_NUM_CACHED_PATHS 4
/** A path record cache entry */
struct ib_cached_path_record {
/** Infiniband device's port GID
*
* Used to disambiguate cache entries when we have multiple
* Infiniband devices, without having to maintain a pointer to
* the Infiniband device.
*/
struct ib_gid sgid;
/** Destination GID */
struct ib_gid dgid;
/** Destination LID */
unsigned int dlid;
/** Rate */
unsigned int rate;
/** Service level */
unsigned int sl;
};
/** Path record cache */
static struct ib_cached_path_record ib_path_cache[IB_NUM_CACHED_PATHS];
/** Oldest path record cache entry index */
static unsigned int ib_path_cache_idx;
/**
* Find path record cache entry
*
* @v ibdev Infiniband device
* @v dgid Destination GID
* @ret cached Path record cache entry, or NULL
*/
static struct ib_cached_path_record *
ib_find_path_cache_entry ( struct ib_device *ibdev, struct ib_gid *dgid ) {
struct ib_cached_path_record *cached;
unsigned int i;
for ( i = 0 ; i < IB_NUM_CACHED_PATHS ; i++ ) {
cached = &ib_path_cache[i];
if ( memcmp ( &cached->sgid, &ibdev->gid,
sizeof ( cached->sgid ) ) != 0 )
continue;
if ( memcmp ( &cached->dgid, dgid,
sizeof ( cached->dgid ) ) != 0 )
continue;
return cached;
}
return NULL;
}
/**
* Resolve path record
*
* @v ibdev Infiniband device
* @v av Address vector to complete
* @ret rc Return status code
*/
int ib_resolve_path ( struct ib_device *ibdev,
struct ib_address_vector *av ) {
struct ib_gma *gma = ibdev->gma;
struct ib_gid *gid = &av->gid;
struct ib_cached_path_record *cached;
union ib_mad mad;
struct ib_mad_sa *sa = &mad.sa;
unsigned int cache_idx;
int rc;
/* Sanity check */
if ( ! av->gid_present ) {
DBGC ( gma, "GMA %p attempt to look up path record "
"without GID\n", gma );
return -EINVAL;
}
/* Look in cache for a matching entry */
cached = ib_find_path_cache_entry ( ibdev, gid );
if ( cached && cached->dlid ) {
/* Populated entry found */
av->lid = cached->dlid;
av->rate = cached->rate;
av->sl = cached->sl;
DBGC2 ( gma, "GMA %p cache hit for %08x:%08x:%08x:%08x\n",
gma, htonl ( gid->u.dwords[0] ),
htonl ( gid->u.dwords[1] ), htonl ( gid->u.dwords[2] ),
htonl ( gid->u.dwords[3] ) );
return 0;
}
DBGC ( gma, "GMA %p cache miss for %08x:%08x:%08x:%08x%s\n", gma,
htonl ( gid->u.dwords[0] ), htonl ( gid->u.dwords[1] ),
htonl ( gid->u.dwords[2] ), htonl ( gid->u.dwords[3] ),
( cached ? " (in progress)" : "" ) );
/* If no unresolved entry was found, then create a new one */
if ( ! cached ) {
cache_idx = ( (ib_path_cache_idx++) % IB_NUM_CACHED_PATHS );
cached = &ib_path_cache[cache_idx];
memset ( cached, 0, sizeof ( *cached ) );
memcpy ( &cached->sgid, &ibdev->gid, sizeof ( cached->sgid ) );
memcpy ( &cached->dgid, gid, sizeof ( cached->dgid ) );
}
/* Construct path record request */
memset ( sa, 0, sizeof ( *sa ) );
sa->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
sa->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
sa->mad_hdr.class_version = IB_SA_CLASS_VERSION;
sa->mad_hdr.method = IB_MGMT_METHOD_GET;
sa->mad_hdr.attr_id = htons ( IB_SA_ATTR_PATH_REC );
sa->sa_hdr.comp_mask[1] =
htonl ( IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID );
memcpy ( &sa->sa_data.path_record.dgid, &cached->dgid,
sizeof ( sa->sa_data.path_record.dgid ) );
memcpy ( &sa->sa_data.path_record.sgid, &cached->sgid,
sizeof ( sa->sa_data.path_record.sgid ) );
/* Issue path record request */
if ( ( rc = ib_gma_request ( gma, &mad, NULL, 1 ) ) != 0 ) {
DBGC ( gma, "GMA %p could not get path record: %s\n",
gma, strerror ( rc ) );
return rc;
}
/* Not found yet */
return -ENOENT;
}
/**
* Handle path record response
*
* @v gma General management agent
* @v mad MAD
* @ret response MAD response
*/
static union ib_mad * ib_handle_path_record ( struct ib_gma *gma,
union ib_mad *mad ) {
struct ib_device *ibdev = gma->ibdev;
struct ib_path_record *path_record = &mad->sa.sa_data.path_record;
struct ib_gid *dgid = &path_record->dgid;
struct ib_cached_path_record *cached;
unsigned int dlid;
unsigned int sl;
unsigned int rate;
/* Ignore if not a success */
if ( mad->hdr.status != htons ( IB_MGMT_STATUS_OK ) ) {
DBGC ( gma, "GMA %p path record lookup failed with status "
"%04x\n", gma, ntohs ( mad->hdr.status ) );
return NULL;
}
/* Extract values from MAD */
dlid = ntohs ( path_record->dlid );
sl = ( path_record->reserved__sl & 0x0f );
rate = ( path_record->rate_selector__rate & 0x3f );
DBGC ( gma, "GMA %p path to %08x:%08x:%08x:%08x is %04x sl %d "
"rate %d\n", gma, htonl ( dgid->u.dwords[0] ),
htonl ( dgid->u.dwords[1] ), htonl ( dgid->u.dwords[2] ),
htonl ( dgid->u.dwords[3] ), dlid, sl, rate );
/* Look for a matching cache entry to fill in */
if ( ( cached = ib_find_path_cache_entry ( ibdev, dgid ) ) != NULL ) {
DBGC ( gma, "GMA %p cache add for %08x:%08x:%08x:%08x\n",
gma, htonl ( dgid->u.dwords[0] ),
htonl ( dgid->u.dwords[1] ),
htonl ( dgid->u.dwords[2] ),
htonl ( dgid->u.dwords[3] ) );
cached->dlid = dlid;
cached->rate = rate;
cached->sl = sl;
}
return NULL;
}
/** Path record response handler */
struct ib_gma_handler ib_path_record_handler __ib_gma_handler = {
.mgmt_class = IB_MGMT_CLASS_SUBN_ADM,
.class_version = IB_SA_CLASS_VERSION,
.method = IB_MGMT_METHOD_GET_RESP,
.attr_id = htons ( IB_SA_ATTR_PATH_REC ),
.handle = ib_handle_path_record,
};
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