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https://github.com/ipxe/ipxe
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[infiniband] Provide a general mechanism for path record lookups
Generalise out the path record lookup code from IPoIB.
This commit is contained in:
Michael Brown
221
src/net/infiniband/ib_pathrec.c
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221
src/net/infiniband/ib_pathrec.c
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/*
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* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <string.h>
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#include <byteswap.h>
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#include <errno.h>
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#include <gpxe/infiniband.h>
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#include <gpxe/ib_gma.h>
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#include <gpxe/ib_pathrec.h>
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/** @file
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*
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* Infiniband path lookups
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*
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*/
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/** Number of path record cache entries
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*
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* Must be a power of two.
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*/
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#define IB_NUM_CACHED_PATHS 4
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/** A path record cache entry */
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struct ib_cached_path_record {
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/** Infiniband device's port GID
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*
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* Used to disambiguate cache entries when we have multiple
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* Infiniband devices, without having to maintain a pointer to
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* the Infiniband device.
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*/
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struct ib_gid sgid;
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/** Destination GID */
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struct ib_gid dgid;
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/** Destination LID */
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unsigned int dlid;
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/** Rate */
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unsigned int rate;
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/** Service level */
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unsigned int sl;
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};
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/** Path record cache */
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static struct ib_cached_path_record ib_path_cache[IB_NUM_CACHED_PATHS];
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/** Oldest path record cache entry index */
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static unsigned int ib_path_cache_idx;
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/**
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* Find path record cache entry
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*
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* @v ibdev Infiniband device
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* @v dgid Destination GID
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* @ret cached Path record cache entry, or NULL
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*/
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static struct ib_cached_path_record *
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ib_find_path_cache_entry ( struct ib_device *ibdev, struct ib_gid *dgid ) {
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struct ib_cached_path_record *cached;
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unsigned int i;
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for ( i = 0 ; i < IB_NUM_CACHED_PATHS ; i++ ) {
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cached = &ib_path_cache[i];
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if ( memcmp ( &cached->sgid, &ibdev->gid,
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sizeof ( cached->sgid ) ) != 0 )
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continue;
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if ( memcmp ( &cached->dgid, dgid,
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sizeof ( cached->dgid ) ) != 0 )
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continue;
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return cached;
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}
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return NULL;
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}
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/**
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* Resolve path record
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*
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* @v ibdev Infiniband device
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* @v av Address vector to complete
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* @ret rc Return status code
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*/
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int ib_resolve_path ( struct ib_device *ibdev,
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struct ib_address_vector *av ) {
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struct ib_gid *gid = &av->gid;
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struct ib_cached_path_record *cached;
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union ib_mad mad;
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struct ib_mad_sa *sa = &mad.sa;
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unsigned int cache_idx;
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int rc;
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/* Sanity check */
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if ( ! av->gid_present ) {
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DBGC ( ibdev, "IBDEV %p attempt to look up path record "
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"without GID\n", ibdev );
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return -EINVAL;
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}
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/* Look in cache for a matching entry */
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cached = ib_find_path_cache_entry ( ibdev, gid );
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if ( cached && cached->dlid ) {
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/* Populated entry found */
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av->lid = cached->dlid;
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av->rate = cached->rate;
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av->sl = cached->sl;
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DBGC2 ( ibdev, "IBDEV %p cache hit for %08x:%08x:%08x:%08x\n",
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ibdev, htonl ( gid->u.dwords[0] ),
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htonl ( gid->u.dwords[1] ), htonl ( gid->u.dwords[2] ),
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htonl ( gid->u.dwords[3] ) );
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return 0;
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}
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DBGC ( ibdev, "IBDEV %p cache miss for %08x:%08x:%08x:%08x%s\n", ibdev,
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htonl ( gid->u.dwords[0] ), htonl ( gid->u.dwords[1] ),
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htonl ( gid->u.dwords[2] ), htonl ( gid->u.dwords[3] ),
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( cached ? " (in progress)" : "" ) );
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/* If no unresolved entry was found, then create a new one */
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if ( ! cached ) {
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cache_idx = ( (ib_path_cache_idx++) % IB_NUM_CACHED_PATHS );
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cached = &ib_path_cache[cache_idx];
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memset ( cached, 0, sizeof ( *cached ) );
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memcpy ( &cached->sgid, &ibdev->gid, sizeof ( cached->sgid ) );
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memcpy ( &cached->dgid, gid, sizeof ( cached->dgid ) );
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}
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/* Construct path record request */
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memset ( sa, 0, sizeof ( *sa ) );
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sa->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
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sa->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
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sa->mad_hdr.class_version = IB_SA_CLASS_VERSION;
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sa->mad_hdr.method = IB_MGMT_METHOD_GET;
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sa->mad_hdr.attr_id = htons ( IB_SA_ATTR_PATH_REC );
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sa->sa_hdr.comp_mask[1] =
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htonl ( IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID );
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memcpy ( &sa->sa_data.path_record.dgid, &cached->dgid,
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sizeof ( sa->sa_data.path_record.dgid ) );
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memcpy ( &sa->sa_data.path_record.sgid, &cached->sgid,
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sizeof ( sa->sa_data.path_record.sgid ) );
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/* Issue path record request */
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if ( ( rc = ib_gma_request ( &ibdev->gma, &mad, NULL ) ) != 0 ) {
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DBGC ( ibdev, "IBDEV %p could not get path record: %s\n",
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ibdev, strerror ( rc ) );
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return rc;
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}
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/* Not found yet */
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return -ENOENT;
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}
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/**
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* Handle path record response
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*
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* @v ibdev Infiniband device
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* @v mad MAD
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* @ret rc Return status code
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*/
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static int ib_handle_path_record ( struct ib_device *ibdev,
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union ib_mad *mad ) {
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struct ib_path_record *path_record = &mad->sa.sa_data.path_record;
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struct ib_gid *dgid = &path_record->dgid;
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struct ib_cached_path_record *cached;
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unsigned int dlid;
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unsigned int sl;
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unsigned int rate;
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/* Ignore if not a success */
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if ( mad->hdr.status != htons ( IB_MGMT_STATUS_OK ) ) {
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DBGC ( ibdev, "IBDEV %p path record lookup failed with status "
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"%04x\n", ibdev, ntohs ( mad->hdr.status ) );
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return -EINVAL;
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}
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/* Extract values from MAD */
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dlid = ntohs ( path_record->dlid );
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sl = ( path_record->reserved__sl & 0x0f );
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rate = ( path_record->rate_selector__rate & 0x3f );
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DBGC ( ibdev, "IBDEV %p path to %08x:%08x:%08x:%08x is %04x sl %d "
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"rate %d\n", ibdev, htonl ( dgid->u.dwords[0] ),
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htonl ( dgid->u.dwords[1] ), htonl ( dgid->u.dwords[2] ),
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htonl ( dgid->u.dwords[3] ), dlid, sl, rate );
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/* Look for a matching cache entry to fill in */
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if ( ( cached = ib_find_path_cache_entry ( ibdev, dgid ) ) != NULL ) {
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DBGC ( ibdev, "IBDEV %p cache add for %08x:%08x:%08x:%08x\n",
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ibdev, htonl ( dgid->u.dwords[0] ),
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htonl ( dgid->u.dwords[1] ),
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htonl ( dgid->u.dwords[2] ),
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htonl ( dgid->u.dwords[3] ) );
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cached->dlid = dlid;
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cached->rate = rate;
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cached->sl = sl;
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}
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return 0;
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}
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/** Path record response handler */
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struct ib_mad_handler ib_path_record_handler __ib_mad_handler = {
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.mgmt_class = IB_MGMT_CLASS_SUBN_ADM,
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.class_version = IB_SA_CLASS_VERSION,
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.method = IB_MGMT_METHOD_GET_RESP,
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.attr_id = htons ( IB_SA_ATTR_PATH_REC ),
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.handle = ib_handle_path_record,
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};
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