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diff --git a/gpxe/src/net/infiniband/ib_cm.c b/gpxe/src/net/infiniband/ib_cm.c
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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 <stdlib.h>
+#include <string.h>
+#include <byteswap.h>
+#include <errno.h>
+#include <assert.h>
+#include <gpxe/infiniband.h>
+#include <gpxe/ib_mi.h>
+#include <gpxe/ib_pathrec.h>
+#include <gpxe/ib_cm.h>
+
+/**
+ * @file
+ *
+ * Infiniband communication management
+ *
+ */
+
+/** List of connections */
+static LIST_HEAD ( ib_cm_conns );
+
+/**
+ * Send "ready to use" response
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v conn Connection
+ * @v av Address vector
+ * @ret rc Return status code
+ */
+static int ib_cm_send_rtu ( struct ib_device *ibdev,
+ struct ib_mad_interface *mi,
+ struct ib_connection *conn,
+ struct ib_address_vector *av ) {
+ union ib_mad mad;
+ struct ib_cm_ready_to_use *ready =
+ &mad.cm.cm_data.ready_to_use;
+ int rc;
+
+ /* Construct "ready to use" response */
+ memset ( &mad, 0, sizeof ( mad ) );
+ mad.hdr.mgmt_class = IB_MGMT_CLASS_CM;
+ mad.hdr.class_version = IB_CM_CLASS_VERSION;
+ mad.hdr.method = IB_MGMT_METHOD_SEND;
+ mad.hdr.attr_id = htons ( IB_CM_ATTR_READY_TO_USE );
+ ready->local_id = htonl ( conn->local_id );
+ ready->remote_id = htonl ( conn->remote_id );
+ if ( ( rc = ib_mi_send ( ibdev, mi, &mad, av ) ) != 0 ){
+ DBGC ( conn, "CM %p could not send RTU: %s\n",
+ conn, strerror ( rc ) );
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * Handle duplicate connection replies
+ *
+ * @v ibdev Infiniband device
+ * @v mi Management interface
+ * @v mad Received MAD
+ * @v av Source address vector
+ * @ret rc Return status code
+ *
+ * If a "ready to use" MAD is lost, the peer may resend the connection
+ * reply. We have to respond to these with duplicate "ready to use"
+ * MADs, otherwise the peer may time out and drop the connection.
+ */
+static void ib_cm_connect_rep ( struct ib_device *ibdev,
+ struct ib_mad_interface *mi,
+ union ib_mad *mad,
+ struct ib_address_vector *av ) {
+ struct ib_cm_connect_reply *connect_rep =
+ &mad->cm.cm_data.connect_reply;
+ struct ib_connection *conn;
+ int rc;
+
+ /* Identify connection */
+ list_for_each_entry ( conn, &ib_cm_conns, list ) {
+ if ( ntohl ( connect_rep->remote_id ) != conn->local_id )
+ continue;
+ /* Try to send "ready to use" reply */
+ if ( ( rc = ib_cm_send_rtu ( ibdev, mi, conn, av ) ) != 0 ) {
+ /* Ignore errors */
+ return;
+ }
+ return;
+ }
+
+ DBG ( "CM unidentified connection %08x\n",
+ ntohl ( connect_rep->remote_id ) );
+}
+
+/** Communication management agents */
+struct ib_mad_agent ib_cm_agent[] __ib_mad_agent = {
+ {
+ .mgmt_class = IB_MGMT_CLASS_CM,
+ .class_version = IB_CM_CLASS_VERSION,
+ .attr_id = htons ( IB_CM_ATTR_CONNECT_REPLY ),
+ .handle = ib_cm_connect_rep,
+ },
+};
+
+/**
+ * Convert connection rejection reason to return status code
+ *
+ * @v reason Rejection reason (in network byte order)
+ * @ret rc Return status code
+ */
+static int ib_cm_rejection_reason_to_rc ( uint16_t reason ) {
+ switch ( reason ) {
+ case htons ( IB_CM_REJECT_BAD_SERVICE_ID ) :
+ return -ENODEV;
+ case htons ( IB_CM_REJECT_STALE_CONN ) :
+ return -EALREADY;
+ case htons ( IB_CM_REJECT_CONSUMER ) :
+ return -ENOTTY;
+ default:
+ return -EPERM;
+ }
+}
+
+/**
+ * Handle connection request 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_cm_req_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 ) {
+ struct ib_connection *conn = ib_madx_get_ownerdata ( madx );
+ struct ib_queue_pair *qp = conn->qp;
+ struct ib_cm_common *common = &mad->cm.cm_data.common;
+ struct ib_cm_connect_reply *connect_rep =
+ &mad->cm.cm_data.connect_reply;
+ struct ib_cm_connect_reject *connect_rej =
+ &mad->cm.cm_data.connect_reject;
+ void *private_data = NULL;
+ size_t private_data_len = 0;
+
+ /* Report failures */
+ if ( ( rc == 0 ) && ( mad->hdr.status != htons ( IB_MGMT_STATUS_OK ) ))
+ rc = -EIO;
+ if ( rc != 0 ) {
+ DBGC ( conn, "CM %p connection request failed: %s\n",
+ conn, strerror ( rc ) );
+ goto out;
+ }
+
+ /* Record remote communication ID */
+ conn->remote_id = ntohl ( common->local_id );
+
+ /* Handle response */
+ switch ( mad->hdr.attr_id ) {
+
+ case htons ( IB_CM_ATTR_CONNECT_REPLY ) :
+ /* Extract fields */
+ qp->av.qpn = ( ntohl ( connect_rep->local_qpn ) >> 8 );
+ qp->send.psn = ( ntohl ( connect_rep->starting_psn ) >> 8 );
+ private_data = &connect_rep->private_data;
+ private_data_len = sizeof ( connect_rep->private_data );
+ DBGC ( conn, "CM %p connected to QPN %lx PSN %x\n",
+ conn, qp->av.qpn, qp->send.psn );
+
+ /* Modify queue pair */
+ if ( ( rc = ib_modify_qp ( ibdev, qp ) ) != 0 ) {
+ DBGC ( conn, "CM %p could not modify queue pair: %s\n",
+ conn, strerror ( rc ) );
+ goto out;
+ }
+
+ /* Send "ready to use" reply */
+ if ( ( rc = ib_cm_send_rtu ( ibdev, mi, conn, av ) ) != 0 ) {
+ /* Treat as non-fatal */
+ rc = 0;
+ }
+ break;
+
+ case htons ( IB_CM_ATTR_CONNECT_REJECT ) :
+ /* Extract fields */
+ DBGC ( conn, "CM %p connection rejected (reason %d)\n",
+ conn, ntohs ( connect_rej->reason ) );
+ /* Private data is valid only for a Consumer Reject */
+ if ( connect_rej->reason == htons ( IB_CM_REJECT_CONSUMER ) ) {
+ private_data = &connect_rej->private_data;
+ private_data_len = sizeof (connect_rej->private_data);
+ }
+ rc = ib_cm_rejection_reason_to_rc ( connect_rej->reason );
+ break;
+
+ default:
+ DBGC ( conn, "CM %p unexpected response (attribute %04x)\n",
+ conn, ntohs ( mad->hdr.attr_id ) );
+ rc = -ENOTSUP;
+ break;
+ }
+
+ out:
+ /* Destroy the completed transaction */
+ ib_destroy_madx ( ibdev, ibdev->gsi, madx );
+ conn->madx = NULL;
+
+ /* Hand off to the upper completion handler */
+ conn->op->changed ( ibdev, qp, conn, rc, private_data,
+ private_data_len );
+}
+
+/** Connection request operations */
+static struct ib_mad_transaction_operations ib_cm_req_op = {
+ .complete = ib_cm_req_complete,
+};
+
+/**
+ * Handle connection 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_cm_path_complete ( struct ib_device *ibdev,
+ struct ib_path *path, int rc,
+ struct ib_address_vector *av ) {
+ struct ib_connection *conn = ib_path_get_ownerdata ( path );
+ struct ib_queue_pair *qp = conn->qp;
+ union ib_mad mad;
+ struct ib_cm_connect_request *connect_req =
+ &mad.cm.cm_data.connect_request;
+ size_t private_data_len;
+
+ /* Report failures */
+ if ( rc != 0 ) {
+ DBGC ( conn, "CM %p path lookup failed: %s\n",
+ conn, strerror ( rc ) );
+ conn->op->changed ( ibdev, qp, conn, rc, NULL, 0 );
+ goto out;
+ }
+
+ /* Update queue pair peer path */
+ memcpy ( &qp->av, av, sizeof ( qp->av ) );
+
+ /* Construct connection request */
+ memset ( &mad, 0, sizeof ( mad ) );
+ mad.hdr.mgmt_class = IB_MGMT_CLASS_CM;
+ mad.hdr.class_version = IB_CM_CLASS_VERSION;
+ mad.hdr.method = IB_MGMT_METHOD_SEND;
+ mad.hdr.attr_id = htons ( IB_CM_ATTR_CONNECT_REQUEST );
+ connect_req->local_id = htonl ( conn->local_id );
+ memcpy ( &connect_req->service_id, &conn->service_id,
+ sizeof ( connect_req->service_id ) );
+ ib_get_hca_info ( ibdev, &connect_req->local_ca );
+ connect_req->local_qpn__responder_resources =
+ htonl ( ( qp->qpn << 8 ) | 1 );
+ connect_req->local_eecn__initiator_depth = htonl ( ( 0 << 8 ) | 1 );
+ connect_req->remote_eecn__remote_timeout__service_type__ee_flow_ctrl =
+ htonl ( ( 0x14 << 3 ) | ( IB_CM_TRANSPORT_RC << 1 ) |
+ ( 0 << 0 ) );
+ connect_req->starting_psn__local_timeout__retry_count =
+ htonl ( ( qp->recv.psn << 8 ) | ( 0x14 << 3 ) |
+ ( 0x07 << 0 ) );
+ connect_req->pkey = htons ( ibdev->pkey );
+ connect_req->payload_mtu__rdc_exists__rnr_retry =
+ ( ( IB_MTU_2048 << 4 ) | ( 1 << 3 ) | ( 0x07 << 0 ) );
+ connect_req->max_cm_retries__srq =
+ ( ( 0x0f << 4 ) | ( 0 << 3 ) );
+ connect_req->primary.local_lid = htons ( ibdev->lid );
+ connect_req->primary.remote_lid = htons ( conn->qp->av.lid );
+ memcpy ( &connect_req->primary.local_gid, &ibdev->gid,
+ sizeof ( connect_req->primary.local_gid ) );
+ memcpy ( &connect_req->primary.remote_gid, &conn->qp->av.gid,
+ sizeof ( connect_req->primary.remote_gid ) );
+ connect_req->primary.flow_label__rate =
+ htonl ( ( 0 << 12 ) | ( conn->qp->av.rate << 0 ) );
+ connect_req->primary.hop_limit = 0;
+ connect_req->primary.sl__subnet_local =
+ ( ( conn->qp->av.sl << 4 ) | ( 1 << 3 ) );
+ connect_req->primary.local_ack_timeout = ( 0x13 << 3 );
+ private_data_len = conn->private_data_len;
+ if ( private_data_len > sizeof ( connect_req->private_data ) )
+ private_data_len = sizeof ( connect_req->private_data );
+ memcpy ( &connect_req->private_data, &conn->private_data,
+ private_data_len );
+
+ /* Create connection request */
+ av->qpn = IB_QPN_GSI;
+ av->qkey = IB_QKEY_GSI;
+ conn->madx = ib_create_madx ( ibdev, ibdev->gsi, &mad, av,
+ &ib_cm_req_op );
+ if ( ! conn->madx ) {
+ DBGC ( conn, "CM %p could not create connection request\n",
+ conn );
+ conn->op->changed ( ibdev, qp, conn, rc, NULL, 0 );
+ goto out;
+ }
+ ib_madx_set_ownerdata ( conn->madx, conn );
+
+ out:
+ /* Destroy the completed transaction */
+ ib_destroy_path ( ibdev, path );
+ conn->path = NULL;
+}
+
+/** Connection path operations */
+static struct ib_path_operations ib_cm_path_op = {
+ .complete = ib_cm_path_complete,
+};
+
+/**
+ * Create connection to remote QP
+ *
+ * @v ibdev Infiniband device
+ * @v qp Queue pair
+ * @v dgid Target GID
+ * @v service_id Target service ID
+ * @v private_data Connection request private data
+ * @v private_data_len Length of connection request private data
+ * @v op Connection operations
+ * @ret conn Connection
+ */
+struct ib_connection *
+ib_create_conn ( struct ib_device *ibdev, struct ib_queue_pair *qp,
+ struct ib_gid *dgid, struct ib_gid_half *service_id,
+ void *private_data, size_t private_data_len,
+ struct ib_connection_operations *op ) {
+ struct ib_connection *conn;
+
+ /* Allocate and initialise request */
+ conn = zalloc ( sizeof ( *conn ) + private_data_len );
+ if ( ! conn )
+ goto err_alloc_conn;
+ conn->ibdev = ibdev;
+ conn->qp = qp;
+ memset ( &qp->av, 0, sizeof ( qp->av ) );
+ qp->av.gid_present = 1;
+ memcpy ( &qp->av.gid, dgid, sizeof ( qp->av.gid ) );
+ conn->local_id = random();
+ memcpy ( &conn->service_id, service_id, sizeof ( conn->service_id ) );
+ conn->op = op;
+ conn->private_data_len = private_data_len;
+ memcpy ( &conn->private_data, private_data, private_data_len );
+
+ /* Create path */
+ conn->path = ib_create_path ( ibdev, &qp->av, &ib_cm_path_op );
+ if ( ! conn->path )
+ goto err_create_path;
+ ib_path_set_ownerdata ( conn->path, conn );
+
+ /* Add to list of connections */
+ list_add ( &conn->list, &ib_cm_conns );
+
+ DBGC ( conn, "CM %p created for IBDEV %p QPN %lx\n",
+ conn, ibdev, qp->qpn );
+ DBGC ( conn, "CM %p connecting to %08x:%08x:%08x:%08x %08x:%08x\n",
+ conn, ntohl ( dgid->u.dwords[0] ), ntohl ( dgid->u.dwords[1] ),
+ ntohl ( dgid->u.dwords[2] ), ntohl ( dgid->u.dwords[3] ),
+ ntohl ( service_id->u.dwords[0] ),
+ ntohl ( service_id->u.dwords[1] ) );
+
+ return conn;
+
+ ib_destroy_path ( ibdev, conn->path );
+ err_create_path:
+ free ( conn );
+ err_alloc_conn:
+ return NULL;
+}
+
+/**
+ * Destroy connection to remote QP
+ *
+ * @v ibdev Infiniband device
+ * @v qp Queue pair
+ * @v conn Connection
+ */
+void ib_destroy_conn ( struct ib_device *ibdev,
+ struct ib_queue_pair *qp __unused,
+ struct ib_connection *conn ) {
+
+ list_del ( &conn->list );
+ if ( conn->madx )
+ ib_destroy_madx ( ibdev, ibdev->gsi, conn->madx );
+ if ( conn->path )
+ ib_destroy_path ( ibdev, conn->path );
+ free ( conn );
+}