/*
* 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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <byteswap.h>
#include <errno.h>
#include <assert.h>
#include <gpxe/list.h>
#include <gpxe/if_arp.h>
#include <gpxe/netdevice.h>
#include <gpxe/iobuf.h>
#include <gpxe/ipoib.h>
#include <gpxe/infiniband.h>
/** @file
*
* Infiniband protocol
*
*/
/**
* Create completion queue
*
* @v ibdev Infiniband device
* @v num_cqes Number of completion queue entries
* @ret cq New completion queue
*/
struct ib_completion_queue * ib_create_cq ( struct ib_device *ibdev,
unsigned int num_cqes ) {
struct ib_completion_queue *cq;
int rc;
DBGC ( ibdev, "IBDEV %p creating completion queue\n", ibdev );
/* Allocate and initialise data structure */
cq = zalloc ( sizeof ( *cq ) );
if ( ! cq )
return NULL;
cq->num_cqes = num_cqes;
INIT_LIST_HEAD ( &cq->work_queues );
/* Perform device-specific initialisation and get CQN */
if ( ( rc = ibdev->op->create_cq ( ibdev, cq ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not initialise completion "
"queue: %s\n", ibdev, strerror ( rc ) );
free ( cq );
return NULL;
}
DBGC ( ibdev, "IBDEV %p created %d-entry completion queue %p (%p) "
"with CQN %#lx\n", ibdev, num_cqes, cq, cq->dev_priv, cq->cqn );
return cq;
}
/**
* Destroy completion queue
*
* @v ibdev Infiniband device
* @v cq Completion queue
*/
void ib_destroy_cq ( struct ib_device *ibdev,
struct ib_completion_queue *cq ) {
DBGC ( ibdev, "IBDEV %p destroying completion queue %#lx\n",
ibdev, cq->cqn );
assert ( list_empty ( &cq->work_queues ) );
ibdev->op->destroy_cq ( ibdev, cq );
free ( cq );
}
/**
* Create queue pair
*
* @v ibdev Infiniband device
* @v num_send_wqes Number of send work queue entries
* @v send_cq Send completion queue
* @v num_recv_wqes Number of receive work queue entries
* @v recv_cq Receive completion queue
* @v qkey Queue key
* @ret qp Queue pair
*/
struct ib_queue_pair * ib_create_qp ( struct ib_device *ibdev,
unsigned int num_send_wqes,
struct ib_completion_queue *send_cq,
unsigned int num_recv_wqes,
struct ib_completion_queue *recv_cq,
unsigned long qkey ) {
struct ib_queue_pair *qp;
size_t total_size;
int rc;
DBGC ( ibdev, "IBDEV %p creating queue pair\n", ibdev );
/* Allocate and initialise data structure */
total_size = ( sizeof ( *qp ) +
( num_send_wqes * sizeof ( qp->send.iobufs[0] ) ) +
( num_recv_wqes * sizeof ( qp->recv.iobufs[0] ) ) );
qp = zalloc ( total_size );
if ( ! qp )
return NULL;
qp->qkey = qkey;
qp->send.qp = qp;
qp->send.is_send = 1;
qp->send.cq = send_cq;
list_add ( &qp->send.list, &send_cq->work_queues );
qp->send.num_wqes = num_send_wqes;
qp->send.iobufs = ( ( ( void * ) qp ) + sizeof ( *qp ) );
qp->recv.qp = qp;
qp->recv.cq = recv_cq;
list_add ( &qp->recv.list, &recv_cq->work_queues );
qp->recv.num_wqes = num_recv_wqes;
qp->recv.iobufs = ( ( ( void * ) qp ) + sizeof ( *qp ) +
( num_send_wqes * sizeof ( qp->send.iobufs[0] ) ));
/* Perform device-specific initialisation and get QPN */
if ( ( rc = ibdev->op->create_qp ( ibdev, qp ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not initialise queue pair: "
"%s\n", ibdev, strerror ( rc ) );
list_del ( &qp->send.list );
list_del ( &qp->recv.list );
free ( qp );
return NULL;
}
DBGC ( ibdev, "IBDEV %p created queue pair %p (%p) with QPN %#lx\n",
ibdev, qp, qp->dev_priv, qp->qpn );
DBGC ( ibdev, "IBDEV %p QPN %#lx has %d send entries at [%p,%p)\n",
ibdev, qp->qpn, num_send_wqes, qp->send.iobufs,
qp->recv.iobufs );
DBGC ( ibdev, "IBDEV %p QPN %#lx has %d receive entries at [%p,%p)\n",
ibdev, qp->qpn, num_recv_wqes, qp->recv.iobufs,
( ( ( void * ) qp ) + total_size ) );
return qp;
}
/**
* Destroy queue pair
*
* @v ibdev Infiniband device
* @v qp Queue pair
*/
void ib_destroy_qp ( struct ib_device *ibdev,
struct ib_queue_pair *qp ) {
DBGC ( ibdev, "IBDEV %p destroying queue pair %#lx\n",
ibdev, qp->qpn );
ibdev->op->destroy_qp ( ibdev, qp );
list_del ( &qp->send.list );
list_del ( &qp->recv.list );
free ( qp );
}
/**
* Find work queue belonging to completion queue
*
* @v cq Completion queue
* @v qpn Queue pair number
* @v is_send Find send work queue (rather than receive)
* @ret wq Work queue, or NULL if not found
*/
struct ib_work_queue * ib_find_wq ( struct ib_completion_queue *cq,
unsigned long qpn, int is_send ) {
struct ib_work_queue *wq;
list_for_each_entry ( wq, &cq->work_queues, list ) {
if ( ( wq->qp->qpn == qpn ) && ( wq->is_send == is_send ) )
return wq;
}
return NULL;
}
/***************************************************************************
*
* Management datagram operations
*
***************************************************************************
*/
/**
* Get port information
*
* @v ibdev Infiniband device
* @v port_info Port information datagram to fill in
* @ret rc Return status code
*/
static int ib_get_port_info ( struct ib_device *ibdev,
struct ib_mad_port_info *port_info ) {
struct ib_mad_hdr *hdr = &port_info->mad_hdr;
int rc;
/* Construct MAD */
memset ( port_info, 0, sizeof ( *port_info ) );
hdr->base_version = IB_MGMT_BASE_VERSION;
hdr->mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
hdr->class_version = 1;
hdr->method = IB_MGMT_METHOD_GET;
hdr->attr_id = htons ( IB_SMP_ATTR_PORT_INFO );
hdr->attr_mod = htonl ( ibdev->port );
if ( ( rc = ib_mad ( ibdev, hdr, sizeof ( *port_info ) ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not get port info: %s\n",
ibdev, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Get GUID information
*
* @v ibdev Infiniband device
* @v guid_info GUID information datagram to fill in
* @ret rc Return status code
*/
static int ib_get_guid_info ( struct ib_device *ibdev,
struct ib_mad_guid_info *guid_info ) {
struct ib_mad_hdr *hdr = &guid_info->mad_hdr;
int rc;
/* Construct MAD */
memset ( guid_info, 0, sizeof ( *guid_info ) );
hdr->base_version = IB_MGMT_BASE_VERSION;
hdr->mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
hdr->class_version = 1;
hdr->method = IB_MGMT_METHOD_GET;
hdr->attr_id = htons ( IB_SMP_ATTR_GUID_INFO );
if ( ( rc = ib_mad ( ibdev, hdr, sizeof ( *guid_info ) ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not get GUID info: %s\n",
ibdev, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Get partition key table
*
* @v ibdev Infiniband device
* @v guid_info Partition key table datagram to fill in
* @ret rc Return status code
*/
static int ib_get_pkey_table ( struct ib_device *ibdev,
struct ib_mad_pkey_table *pkey_table ) {
struct ib_mad_hdr *hdr = &pkey_table->mad_hdr;
int rc;
/* Construct MAD */
memset ( pkey_table, 0, sizeof ( *pkey_table ) );
hdr->base_version = IB_MGMT_BASE_VERSION;
hdr->mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
hdr->class_version = 1;
hdr->method = IB_MGMT_METHOD_GET;
hdr->attr_id = htons ( IB_SMP_ATTR_PKEY_TABLE );
if ( ( rc = ib_mad ( ibdev, hdr, sizeof ( *pkey_table ) ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not get pkey table: %s\n",
ibdev, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Wait for link up
*
* @v ibdev Infiniband device
* @ret rc Return status code
*
* This function shouldn't really exist. Unfortunately, IB links take
* a long time to come up, and we can't get various key parameters
* e.g. our own IPoIB MAC address without information from the subnet
* manager). We should eventually make link-up an asynchronous event.
*/
static int ib_wait_for_link ( struct ib_device *ibdev ) {
struct ib_mad_port_info port_info;
unsigned int retries;
int rc;
printf ( "Waiting for Infiniband link-up..." );
for ( retries = 20 ; retries ; retries-- ) {
if ( ( rc = ib_get_port_info ( ibdev, &port_info ) ) != 0 )
continue;
if ( ( ( port_info.port_state__link_speed_supported ) & 0xf )
== 4 ) {
printf ( "ok\n" );
return 0;
}
printf ( "." );
sleep ( 1 );
}
printf ( "failed\n" );
return -ENODEV;
};
/**
* Get MAD parameters
*
* @v ibdev Infiniband device
* @ret rc Return status code
*/
static int ib_get_mad_params ( struct ib_device *ibdev ) {
union {
/* This union exists just to save stack space */
struct ib_mad_port_info port_info;
struct ib_mad_guid_info guid_info;
struct ib_mad_pkey_table pkey_table;
} u;
int rc;
/* Port info gives us the first half of the port GID and the SM LID */
if ( ( rc = ib_get_port_info ( ibdev, &u.port_info ) ) != 0 )
return rc;
memcpy ( &ibdev->port_gid.u.bytes[0], u.port_info.gid_prefix, 8 );
ibdev->sm_lid = ntohs ( u.port_info.mastersm_lid );
/* GUID info gives us the second half of the port GID */
if ( ( rc = ib_get_guid_info ( ibdev, &u.guid_info ) ) != 0 )
return rc;
memcpy ( &ibdev->port_gid.u.bytes[8], u.guid_info.gid_local, 8 );
/* Get partition key */
if ( ( rc = ib_get_pkey_table ( ibdev, &u.pkey_table ) ) != 0 )
return rc;
ibdev->pkey = ntohs ( u.pkey_table.pkey[0][0] );
DBGC ( ibdev, "IBDEV %p port GID is %08lx:%08lx:%08lx:%08lx\n",
ibdev, htonl ( ibdev->port_gid.u.dwords[0] ),
htonl ( ibdev->port_gid.u.dwords[1] ),
htonl ( ibdev->port_gid.u.dwords[2] ),
htonl ( ibdev->port_gid.u.dwords[3] ) );
return 0;
}
/***************************************************************************
*
* Infiniband device creation/destruction
*
***************************************************************************
*/
/**
* Allocate Infiniband device
*
* @v priv_size Size of private data area
* @ret ibdev Infiniband device, or NULL
*/
struct ib_device * alloc_ibdev ( size_t priv_size ) {
struct ib_device *ibdev;
size_t total_len;
total_len = ( sizeof ( *ibdev ) + priv_size );
ibdev = zalloc ( total_len );
if ( ibdev ) {
ibdev->dev_priv = ( ( ( void * ) ibdev ) + sizeof ( *ibdev ) );
}
return ibdev;
}
/**
* Register Infiniband device
*
* @v ibdev Infiniband device
* @ret rc Return status code
*/
int register_ibdev ( struct ib_device *ibdev ) {
int rc;
/* Open link */
if ( ( rc = ib_open ( ibdev ) ) != 0 )
goto err_open;
/* Wait for link */
if ( ( rc = ib_wait_for_link ( ibdev ) ) != 0 )
goto err_wait_for_link;
/* Get MAD parameters */
if ( ( rc = ib_get_mad_params ( ibdev ) ) != 0 )
goto err_get_mad_params;
/* Add IPoIB device */
if ( ( rc = ipoib_probe ( ibdev ) ) != 0 ) {
DBGC ( ibdev, "IBDEV %p could not add IPoIB device: %s\n",
ibdev, strerror ( rc ) );
goto err_ipoib_probe;
}
return 0;
err_ipoib_probe:
err_get_mad_params:
err_wait_for_link:
ib_close ( ibdev );
err_open:
return rc;
}
/**
* Unregister Infiniband device
*
* @v ibdev Infiniband device
*/
void unregister_ibdev ( struct ib_device *ibdev ) {
ipoib_remove ( ibdev );
ib_close ( ibdev );
}
/**
* Free Infiniband device
*
* @v ibdev Infiniband device
*/
void free_ibdev ( struct ib_device *ibdev ) {
free ( ibdev );
}
