1 files changed, 296 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/net/infiniband/ib_pathrec.c b/contrib/syslinux-4.02/gpxe/src/net/infiniband/ib_pathrec.c
new file mode 100644
index 0000000..136e628
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/net/infiniband/ib_pathrec.c
@@ -0,0 +1,296 @@
+/*
+ * 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 <stdlib.h>
+#include <string.h>
+#include <byteswap.h>
+#include <errno.h>
+#include <gpxe/infiniband.h>
+#include <gpxe/ib_mi.h>
+#include <gpxe/ib_pathrec.h>
+
+/** @file
+ *
+ * Infiniband path lookups
+ *
+ */
+
+/**
+ * Handle path transaction completion
+ *
+ * @v ibdev		Infiniband device
+ * @v mi		Management interface
+ * @v madx		Management transaction
+ * @v rc		Status code
+ * @v mad		Received MAD (or NULL on error)
+ * @v av		Source address vector (or NULL on error)
+ */
+static void ib_path_complete ( struct ib_device *ibdev,
+			       struct ib_mad_interface *mi,
+			       struct ib_mad_transaction *madx,
+			       int rc, union ib_mad *mad,
+			       struct ib_address_vector *av __unused ) {
+	struct ib_path *path = ib_madx_get_ownerdata ( madx );
+	struct ib_gid *dgid = &path->av.gid;
+	struct ib_path_record *pathrec = &mad->sa.sa_data.path_record;
+
+	/* Report failures */
+	if ( ( rc == 0 ) && ( mad->hdr.status != htons ( IB_MGMT_STATUS_OK ) ))
+		rc = -ENETUNREACH;
+	if ( rc != 0 ) {
+		DBGC ( ibdev, "IBDEV %p path lookup for %08x:%08x:%08x:%08x "
+		       "failed: %s\n", ibdev, htonl ( dgid->u.dwords[0] ),
+		       htonl ( dgid->u.dwords[1] ),
+		       htonl ( dgid->u.dwords[2] ),
+		       htonl ( dgid->u.dwords[3] ), strerror ( rc ) );
+		goto out;
+	}
+
+	/* Extract values from MAD */
+	path->av.lid = ntohs ( pathrec->dlid );
+	path->av.sl = ( pathrec->reserved__sl & 0x0f );
+	path->av.rate = ( pathrec->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] ), path->av.lid, path->av.sl,
+	       path->av.rate );
+
+ out:
+	/* Destroy the completed transaction */
+	ib_destroy_madx ( ibdev, mi, madx );
+	path->madx = NULL;
+
+	/* Hand off to upper completion handler */
+	path->op->complete ( ibdev, path, rc, &path->av );
+}
+
+/** Path transaction completion operations */
+static struct ib_mad_transaction_operations ib_path_op = {
+	.complete = ib_path_complete,
+};
+
+/**
+ * Create path
+ *
+ * @v ibdev		Infiniband device
+ * @v av		Address vector to complete
+ * @v op		Path operations
+ * @ret path		Path
+ */
+struct ib_path *
+ib_create_path ( struct ib_device *ibdev, struct ib_address_vector *av,
+		 struct ib_path_operations *op ) {
+	struct ib_path *path;
+	union ib_mad mad;
+	struct ib_mad_sa *sa = &mad.sa;
+
+	/* Allocate and initialise structure */
+	path = zalloc ( sizeof ( *path ) );
+	if ( ! path )
+		goto err_alloc_path;
+	path->ibdev = ibdev;
+	memcpy ( &path->av, av, sizeof ( path->av ) );
+	path->op = op;
+
+	/* Construct path request */
+	memset ( sa, 0, sizeof ( *sa ) );
+	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, &path->av.gid,
+		 sizeof ( sa->sa_data.path_record.dgid ) );
+	memcpy ( &sa->sa_data.path_record.sgid, &ibdev->gid,
+		 sizeof ( sa->sa_data.path_record.sgid ) );
+
+	/* Create management transaction */
+	path->madx = ib_create_madx ( ibdev, ibdev->gsi, &mad, NULL,
+				      &ib_path_op );
+	if ( ! path->madx )
+		goto err_create_madx;
+	ib_madx_set_ownerdata ( path->madx, path );
+
+	return path;
+
+	ib_destroy_madx ( ibdev, ibdev->gsi, path->madx );
+ err_create_madx:
+	free ( path );
+ err_alloc_path:
+	return NULL;
+}
+
+/**
+ * Destroy path
+ *
+ * @v ibdev		Infiniband device
+ * @v path		Path
+ */
+void ib_destroy_path ( struct ib_device *ibdev, struct ib_path *path ) {
+
+	if ( path->madx )
+		ib_destroy_madx ( ibdev, ibdev->gsi, path->madx );
+	free ( path );
+}
+
+/** Number of path cache entries
+ *
+ * Must be a power of two.
+ */
+#define IB_NUM_CACHED_PATHS 4
+
+/** A cached path */
+struct ib_cached_path {
+	/** Path */
+	struct ib_path *path;
+};
+
+/** Path cache */
+static struct ib_cached_path ib_path_cache[IB_NUM_CACHED_PATHS];
+
+/** Oldest path cache entry index */
+static unsigned int ib_path_cache_idx;
+
+/**
+ * Find path cache entry
+ *
+ * @v ibdev		Infiniband device
+ * @v dgid		Destination GID
+ * @ret path		Path cache entry, or NULL
+ */
+static struct ib_cached_path *
+ib_find_path_cache_entry ( struct ib_device *ibdev, struct ib_gid *dgid ) {
+	struct ib_cached_path *cached;
+	unsigned int i;
+
+	for ( i = 0 ; i < IB_NUM_CACHED_PATHS ; i++ ) {
+		cached = &ib_path_cache[i];
+		if ( ! cached->path )
+			continue;
+		if ( cached->path->ibdev != ibdev )
+			continue;
+		if ( memcmp ( &cached->path->av.gid, dgid,
+			      sizeof ( cached->path->av.gid ) ) != 0 )
+			continue;
+		return cached;
+	}
+
+	return NULL;
+}
+
+/**
+ * Handle cached path transaction completion
+ *
+ * @v ibdev		Infiniband device
+ * @v path		Path
+ * @v rc		Status code
+ * @v av		Address vector, or NULL on error
+ */
+static void ib_cached_path_complete ( struct ib_device *ibdev,
+				      struct ib_path *path, int rc,
+				      struct ib_address_vector *av __unused ) {
+	struct ib_cached_path *cached = ib_path_get_ownerdata ( path );
+
+	/* If the transaction failed, erase the cache entry */
+	if ( rc != 0 ) {
+		/* Destroy the old cache entry */
+		ib_destroy_path ( ibdev, path );
+		memset ( cached, 0, sizeof ( *cached ) );
+		return;
+	}
+
+	/* Do not destroy the completed transaction; we still need to
+	 * refer to the resolved path.
+	 */
+}
+
+/** Cached path transaction completion operations */
+static struct ib_path_operations ib_cached_path_op = {
+	.complete = ib_cached_path_complete,
+};
+
+/**
+ * Resolve path
+ *
+ * @v ibdev		Infiniband device
+ * @v av		Address vector to complete
+ * @ret rc		Return status code
+ *
+ * This provides a non-transactional way to resolve a path, via a
+ * cache similar to ARP.
+ */
+int ib_resolve_path ( struct ib_device *ibdev, struct ib_address_vector *av ) {
+	struct ib_gid *gid = &av->gid;
+	struct ib_cached_path *cached;
+	unsigned int cache_idx;
+
+	/* Sanity check */
+	if ( ! av->gid_present ) {
+		DBGC ( ibdev, "IBDEV %p attempt to look up path "
+		       "without GID\n", ibdev );
+		return -EINVAL;
+	}
+
+	/* Look in cache for a matching entry */
+	cached = ib_find_path_cache_entry ( ibdev, gid );
+	if ( cached && cached->path->av.lid ) {
+		/* Populated entry found */
+		av->lid = cached->path->av.lid;
+		av->rate = cached->path->av.rate;
+		av->sl = cached->path->av.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 lookup is already in progress, do nothing */
+	if ( cached )
+		return -ENOENT;
+
+	/* Locate a new cache entry to use */
+	cache_idx = ( (ib_path_cache_idx++) % IB_NUM_CACHED_PATHS );
+	cached = &ib_path_cache[cache_idx];
+
+	/* Destroy the old cache entry */
+	if ( cached->path )
+		ib_destroy_path ( ibdev, cached->path );
+	memset ( cached, 0, sizeof ( *cached ) );
+
+	/* Create new path */
+	cached->path = ib_create_path ( ibdev, av, &ib_cached_path_op );
+	if ( ! cached->path ) {
+		DBGC ( ibdev, "IBDEV %p could not create path\n",
+		       ibdev );
+		return -ENOMEM;
+	}
+	ib_path_set_ownerdata ( cached->path, cached );
+
+	/* Not found yet */
+	return -ENOENT;
+}