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-rw-r--r--gpxe/src/net/infiniband/ib_mcast.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/gpxe/src/net/infiniband/ib_mcast.c b/gpxe/src/net/infiniband/ib_mcast.c
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+/*
+ * Copyright (C) 2007 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/list.h>
+#include <gpxe/infiniband.h>
+#include <gpxe/ib_mi.h>
+#include <gpxe/ib_mcast.h>
+
+/** @file
+ *
+ * Infiniband multicast groups
+ *
+ */
+
+/**
+ * Generate multicast membership MAD
+ *
+ * @v ibdev Infiniband device
+ * @v gid Multicast GID
+ * @v join Join (rather than leave) group
+ * @v mad MAD to fill in
+ */
+static void ib_mcast_mad ( struct ib_device *ibdev, struct ib_gid *gid,
+ int join, union ib_mad *mad ) {
+ struct ib_mad_sa *sa = &mad->sa;
+
+ /* Construct multicast membership record 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 =
+ ( join ? IB_MGMT_METHOD_SET : IB_MGMT_METHOD_DELETE );
+ sa->mad_hdr.attr_id = htons ( IB_SA_ATTR_MC_MEMBER_REC );
+ sa->sa_hdr.comp_mask[1] =
+ htonl ( IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
+ IB_SA_MCMEMBER_REC_JOIN_STATE );
+ sa->sa_data.mc_member_record.scope__join_state = 1;
+ memcpy ( &sa->sa_data.mc_member_record.mgid, gid,
+ sizeof ( sa->sa_data.mc_member_record.mgid ) );
+ memcpy ( &sa->sa_data.mc_member_record.port_gid, &ibdev->gid,
+ sizeof ( sa->sa_data.mc_member_record.port_gid ) );
+}
+
+/**
+ * Handle multicast membership record join response
+ *
+ * @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_mcast_complete ( struct ib_device *ibdev,
+ struct ib_mad_interface *mi __unused,
+ struct ib_mad_transaction *madx,
+ int rc, union ib_mad *mad,
+ struct ib_address_vector *av __unused ) {
+ struct ib_mc_membership *membership = ib_madx_get_ownerdata ( madx );
+ struct ib_queue_pair *qp = membership->qp;
+ struct ib_gid *gid = &membership->gid;
+ struct ib_mc_member_record *mc_member_record =
+ &mad->sa.sa_data.mc_member_record;
+ int joined;
+ unsigned long qkey;
+
+ /* Report failures */
+ if ( ( rc == 0 ) && ( mad->hdr.status != htons ( IB_MGMT_STATUS_OK ) ))
+ rc = -ENOTCONN;
+ if ( rc != 0 ) {
+ DBGC ( ibdev, "IBDEV %p QPN %lx join failed: %s\n",
+ ibdev, qp->qpn, strerror ( rc ) );
+ goto out;
+ }
+
+ /* Extract values from MAD */
+ joined = ( mad->hdr.method == IB_MGMT_METHOD_GET_RESP );
+ qkey = ntohl ( mc_member_record->qkey );
+ DBGC ( ibdev, "IBDEV %p QPN %lx %s %08x:%08x:%08x:%08x qkey %lx\n",
+ ibdev, qp->qpn, ( joined ? "joined" : "left" ),
+ ntohl ( gid->u.dwords[0] ), ntohl ( gid->u.dwords[1] ),
+ ntohl ( gid->u.dwords[2] ), ntohl ( gid->u.dwords[3] ),
+ qkey );
+
+ /* Set queue key */
+ qp->qkey = qkey;
+ if ( ( rc = ib_modify_qp ( ibdev, qp ) ) != 0 ) {
+ DBGC ( ibdev, "IBDEV %p QPN %lx could not modify qkey: %s\n",
+ ibdev, qp->qpn, strerror ( rc ) );
+ goto out;
+ }
+
+ out:
+ /* Destroy the completed transaction */
+ ib_destroy_madx ( ibdev, mi, madx );
+ membership->madx = NULL;
+
+ /* Hand off to upper completion handler */
+ membership->complete ( ibdev, qp, membership, rc, mad );
+}
+
+/** Multicast membership management transaction completion operations */
+static struct ib_mad_transaction_operations ib_mcast_op = {
+ .complete = ib_mcast_complete,
+};
+
+/**
+ * Join multicast group
+ *
+ * @v ibdev Infiniband device
+ * @v qp Queue pair
+ * @v membership Multicast group membership
+ * @v gid Multicast GID to join
+ * @v joined Join completion handler
+ * @ret rc Return status code
+ */
+int ib_mcast_join ( struct ib_device *ibdev, struct ib_queue_pair *qp,
+ struct ib_mc_membership *membership, struct ib_gid *gid,
+ void ( * complete ) ( struct ib_device *ibdev,
+ struct ib_queue_pair *qp,
+ struct ib_mc_membership *membership,
+ int rc, union ib_mad *mad ) ) {
+ union ib_mad mad;
+ int rc;
+
+ DBGC ( ibdev, "IBDEV %p QPN %lx joining %08x:%08x:%08x:%08x\n",
+ ibdev, qp->qpn, ntohl ( gid->u.dwords[0] ),
+ ntohl ( gid->u.dwords[1] ), ntohl ( gid->u.dwords[2] ),
+ ntohl ( gid->u.dwords[3] ) );
+
+ /* Initialise structure */
+ membership->qp = qp;
+ memcpy ( &membership->gid, gid, sizeof ( membership->gid ) );
+ membership->complete = complete;
+
+ /* Attach queue pair to multicast GID */
+ if ( ( rc = ib_mcast_attach ( ibdev, qp, gid ) ) != 0 ) {
+ DBGC ( ibdev, "IBDEV %p QPN %lx could not attach: %s\n",
+ ibdev, qp->qpn, strerror ( rc ) );
+ goto err_mcast_attach;
+ }
+
+ /* Initiate multicast membership join */
+ ib_mcast_mad ( ibdev, gid, 1, &mad );
+ membership->madx = ib_create_madx ( ibdev, ibdev->gsi, &mad, NULL,
+ &ib_mcast_op );
+ if ( ! membership->madx ) {
+ DBGC ( ibdev, "IBDEV %p QPN %lx could not create join "
+ "transaction\n", ibdev, qp->qpn );
+ rc = -ENOMEM;
+ goto err_create_madx;
+ }
+ ib_madx_set_ownerdata ( membership->madx, membership );
+
+ return 0;
+
+ ib_destroy_madx ( ibdev, ibdev->gsi, membership->madx );
+ err_create_madx:
+ ib_mcast_detach ( ibdev, qp, gid );
+ err_mcast_attach:
+ return rc;
+}
+
+/**
+ * Leave multicast group
+ *
+ * @v ibdev Infiniband device
+ * @v qp Queue pair
+ * @v membership Multicast group membership
+ */
+void ib_mcast_leave ( struct ib_device *ibdev, struct ib_queue_pair *qp,
+ struct ib_mc_membership *membership ) {
+ struct ib_gid *gid = &membership->gid;
+ union ib_mad mad;
+ int rc;
+
+ DBGC ( ibdev, "IBDEV %p QPN %lx leaving %08x:%08x:%08x:%08x\n",
+ ibdev, qp->qpn, ntohl ( gid->u.dwords[0] ),
+ ntohl ( gid->u.dwords[1] ), ntohl ( gid->u.dwords[2] ),
+ ntohl ( gid->u.dwords[3] ) );
+
+ /* Detach from multicast GID */
+ ib_mcast_detach ( ibdev, qp, &membership->gid );
+
+ /* Cancel multicast membership join, if applicable */
+ if ( membership->madx ) {
+ ib_destroy_madx ( ibdev, ibdev->gsi, membership->madx );
+ membership->madx = NULL;
+ }
+
+ /* Send a single group leave MAD */
+ ib_mcast_mad ( ibdev, &membership->gid, 0, &mad );
+ if ( ( rc = ib_mi_send ( ibdev, ibdev->gsi, &mad, NULL ) ) != 0 ) {
+ DBGC ( ibdev, "IBDEV %p QPN %lx could not send leave request: "
+ "%s\n", ibdev, qp->qpn, strerror ( rc ) );
+ }
+}