/*
* 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/list.h>
#include <gpxe/process.h>
#include <gpxe/infiniband.h>
#include <gpxe/ib_gma.h>
#include <gpxe/ib_pathrec.h>
#include <gpxe/ib_cm.h>
/**
* @file
*
* Infiniband communication management
*
*/
/** An outstanding connection request */
struct ib_cm_request {
/** List of all outstanding requests */
struct list_head list;
/** Local communication ID */
uint32_t local_id;
/** Remote communication ID */
uint32_t remote_id;
/** Queue pair */
struct ib_queue_pair *qp;
/** Target service ID */
struct ib_gid_half service_id;
/** Connection process */
struct process process;
/** Notification handler
*
* @v qp Queue pair
* @v rc Connection status code
* @v private_data Private data
* @v private_data_len Length of private data
*/
void ( * notify ) ( struct ib_queue_pair *qp, int rc,
void *private_data, size_t private_data_len );
/** Private data length */
size_t private_data_len;
/** Private data */
uint8_t private_data[0];
};
/** List of all outstanding connection requests */
static LIST_HEAD ( ib_cm_requests );
/**
* Send connection request
*
* @v request Connection request
* @ret rc Return status code
*/
static int ib_cm_send_request ( struct ib_cm_request *request ) {
struct ib_queue_pair *qp = request->qp;
struct ib_device *ibdev = qp->ibdev;
struct ib_gma *gma = ibdev->gma;
union ib_mad mad;
struct ib_mad_cm *cm = &mad.cm;
struct ib_cm_connect_request *connect_req =
&cm->cm_data.connect_request;
size_t private_data_len;
int rc;
/* Construct connection request */
memset ( cm, 0, sizeof ( *cm ) );
cm->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
cm->mad_hdr.mgmt_class = IB_MGMT_CLASS_CM;
cm->mad_hdr.class_version = IB_CM_CLASS_VERSION;
cm->mad_hdr.method = IB_MGMT_METHOD_SEND;
cm->mad_hdr.attr_id = htons ( IB_CM_ATTR_CONNECT_REQUEST );
connect_req->local_id = htonl ( request->local_id );
memcpy ( &connect_req->service_id, &request->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 ( request->qp->av.lid );
memcpy ( &connect_req->primary.local_gid, &ibdev->gid,
sizeof ( connect_req->primary.local_gid ) );
memcpy ( &connect_req->primary.remote_gid, &request->qp->av.gid,
sizeof ( connect_req->primary.remote_gid ) );
connect_req->primary.flow_label__rate =
htonl ( ( 0 << 12 ) | ( request->qp->av.rate << 0 ) );
connect_req->primary.hop_limit = 0;
connect_req->primary.sl__subnet_local =
( ( request->qp->av.sl << 4 ) | ( 1 << 3 ) );
connect_req->primary.local_ack_timeout = ( 0x13 << 3 );
private_data_len = request->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, &request->private_data,
private_data_len );
/* Send request */
if ( ( rc = ib_gma_request ( gma, &mad, NULL, 1 ) ) != 0 ) {
DBGC ( gma, "GMA %p could not send connection request: %s\n",
gma, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Connection request process step
*
* @v process Connection request process
*/
static void ib_cm_step ( struct process *process ) {
struct ib_cm_request *request =
container_of ( process, struct ib_cm_request, process );
struct ib_queue_pair *qp = request->qp;
struct ib_device *ibdev = qp->ibdev;
int rc;
/* Wait until path can be resolved */
if ( ( rc = ib_resolve_path ( ibdev, &request->qp->av ) ) != 0 )
return;
/* Wait until request can be sent */
if ( ( rc = ib_cm_send_request ( request ) ) != 0 )
return;
/* Stop process */
process_del ( process );
}
/**
* Identify connection request by communication ID
*
* @v local_id Local communication ID
* @v remote_id Remote communication ID
* @ret request Connection request, or NULL
*/
static struct ib_cm_request * ib_cm_find_request ( uint32_t local_id,
uint32_t remote_id ) {
struct ib_cm_request *request;
list_for_each_entry ( request, &ib_cm_requests, list ) {
if ( request->local_id == local_id ) {
request->remote_id = remote_id;
return request;
}
}
return NULL;
}
/**
* Handle connection reply
*
* @v gma General management agent
* @v mad MAD
* @ret response MAD response
*/
static union ib_mad * ib_cm_connect_reply ( struct ib_gma *gma,
union ib_mad *mad ) {
struct ib_cm_connect_reply *connect_rep =
&mad->cm.cm_data.connect_reply;
struct ib_cm_ready_to_use *ready =
&mad->cm.cm_data.ready_to_use;
struct ib_cm_request *request;
int rc;
/* Identify request */
request = ib_cm_find_request ( ntohl ( connect_rep->remote_id ),
ntohl ( connect_rep->local_id ) );
if ( ! request ) {
DBGC ( gma, "GMA %p received connection reply with unknown "
"ID %08x\n", gma, ntohl ( connect_rep->remote_id ) );
return NULL;
}
/* Extract fields */
request->qp->av.qpn = ( ntohl ( connect_rep->local_qpn ) >> 8 );
request->qp->send.psn = ( ntohl ( connect_rep->starting_psn ) >> 8 );
DBGC ( gma, "GMA %p QPN %lx connected to QPN %lx PSN %x\n", gma,
request->qp->qpn, request->qp->av.qpn, request->qp->send.psn );
/* Modify queue pair */
if ( ( rc = ib_modify_qp ( request->qp->ibdev, request->qp ) ) != 0 ) {
DBGC ( gma, "GMA %p QPN %lx could not modify queue pair: %s\n",
gma, request->qp->qpn, strerror ( rc ) );
return NULL;
}
/* Inform recipient that we are now connected */
request->notify ( request->qp, 0, &connect_rep->private_data,
sizeof ( connect_rep->private_data ) );
/* Construct ready to use reply */
mad->hdr.attr_id = htons ( IB_CM_ATTR_READY_TO_USE );
memset ( ready, 0, sizeof ( *ready ) );
ready->local_id = htonl ( request->local_id );
ready->remote_id = htonl ( request->remote_id );
return mad;
}
/**
* Handle connection rejection
*
* @v gma General management agent
* @v mad MAD
* @ret response MAD response
*/
static union ib_mad * ib_cm_connect_reject ( struct ib_gma *gma,
union ib_mad *mad ) {
struct ib_cm_connect_reject *connect_rej =
&mad->cm.cm_data.connect_reject;
struct ib_cm_request *request;
uint16_t reason;
/* Identify request */
request = ib_cm_find_request ( ntohl ( connect_rej->remote_id ),
ntohl ( connect_rej->local_id ) );
if ( ! request ) {
DBGC ( gma, "GMA %p received connection rejection with "
"unknown ID %08x\n", gma,
ntohl ( connect_rej->remote_id ) );
return NULL;
}
/* Extract fields */
reason = ntohs ( connect_rej->reason );
DBGC ( gma, "GMA %p QPN %lx connection rejected (reason %d)\n",
gma, request->qp->qpn, reason );
/* Inform recipient that we are now disconnected */
request->notify ( request->qp, -ENOTCONN, &connect_rej->private_data,
sizeof ( connect_rej->private_data ) );
return NULL;
}
/** Communication management MAD handlers */
struct ib_gma_handler ib_cm_handlers[] __ib_gma_handler = {
{
.mgmt_class = IB_MGMT_CLASS_CM,
.class_version = IB_CM_CLASS_VERSION,
.method = IB_MGMT_METHOD_SEND,
.attr_id = htons ( IB_CM_ATTR_CONNECT_REPLY ),
.handle = ib_cm_connect_reply,
},
{
.mgmt_class = IB_MGMT_CLASS_CM,
.class_version = IB_CM_CLASS_VERSION,
.method = IB_MGMT_METHOD_SEND,
.attr_id = htons ( IB_CM_ATTR_CONNECT_REJECT ),
.handle = ib_cm_connect_reject,
},
};
/**
* Connect to remote QP
*
* @v qp Queue pair
* @v dgid Target GID
* @v service_id Target service ID
* @v private_data Private data
* @v private_data_len Length of private data
* @ret rc Return status code
*/
int ib_cm_connect ( struct ib_queue_pair *qp, struct ib_gid *dgid,
struct ib_gid_half *service_id,
void *private_data, size_t private_data_len,
void ( * notify ) ( struct ib_queue_pair *qp, int rc,
void *private_data,
size_t private_data_len ) ) {
struct ib_cm_request *request;
/* Allocate and initialise request */
request = zalloc ( sizeof ( *request ) + private_data_len );
if ( ! request )
return -ENOMEM;
list_add ( &request->list, &ib_cm_requests );
request->local_id = random();
request->qp = qp;
memset ( &qp->av, 0, sizeof ( qp->av ) );
qp->av.gid_present = 1;
memcpy ( &qp->av.gid, dgid, sizeof ( qp->av.gid ) );
memcpy ( &request->service_id, service_id,
sizeof ( request->service_id ) );
request->notify = notify;
request->private_data_len = private_data_len;
memcpy ( &request->private_data, private_data, private_data_len );
process_init ( &request->process, ib_cm_step, NULL );
return 0;
}
