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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_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 ( ibdev, "IBDEV %p attempt to look up path record "
- "without GID\n", ibdev );
- 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 ( ibdev, "IBDEV %p cache hit for %08x:%08x:%08x:%08x\n",
- ibdev, htonl ( gid->u.dwords[0] ),
- htonl ( gid->u.dwords[1] ), htonl ( gid->u.dwords[2] ),
- htonl ( gid->u.dwords[3] ) );
- return 0;
- }
- DBGC ( ibdev, "IBDEV %p cache miss for %08x:%08x:%08x:%08x%s\n", ibdev,
- 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 ( &ibdev->gma, &mad, NULL ) ) != 0 ) {
- DBGC ( ibdev, "IBDEV %p could not get path record: %s\n",
- ibdev, strerror ( rc ) );
- return rc;
- }
-
- /* Not found yet */
- return -ENOENT;
- }
-
- /**
- * Handle path record response
- *
- * @v ibdev Infiniband device
- * @v mad MAD
- * @ret rc Return status code
- */
- static int ib_handle_path_record ( struct ib_device *ibdev,
- union ib_mad *mad ) {
- 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 ( ibdev, "IBDEV %p path record lookup failed with status "
- "%04x\n", ibdev, ntohs ( mad->hdr.status ) );
- return -EINVAL;
- }
-
- /* Extract values from MAD */
- dlid = ntohs ( path_record->dlid );
- sl = ( path_record->reserved__sl & 0x0f );
- rate = ( path_record->rate_selector__rate & 0x3f );
- DBGC ( ibdev, "IBDEV %p path to %08x:%08x:%08x:%08x is %04x sl %d "
- "rate %d\n", ibdev, 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 ( ibdev, "IBDEV %p cache add for %08x:%08x:%08x:%08x\n",
- ibdev, 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 0;
- }
-
- /** Path record response handler */
- struct ib_mad_handler ib_path_record_handler __ib_mad_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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