/*
* 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 <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/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 CQ: %s\n",
ibdev, strerror ( rc ) );
free ( cq );
return NULL;
}
DBGC ( ibdev, "IBDEV %p created completion queue %#lx\n",
ibdev, 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 );
}
/**
* 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;
}
/** Infiniband broadcast MAC address */
static uint8_t ib_broadcast[IB_ALEN] = { 0xff, };
/**
* Transmit Infiniband packet
*
* @v iobuf I/O buffer
* @v netdev Network device
* @v net_protocol Network-layer protocol
* @v ll_dest Link-layer destination address
*
* Prepends the Infiniband link-layer header and transmits the packet.
*/
static int ib_tx ( struct io_buffer *iobuf, struct net_device *netdev,
struct net_protocol *net_protocol, const void *ll_dest ) {
struct ibhdr *ibhdr = iob_push ( iobuf, sizeof ( *ibhdr ) );
/* Build Infiniband header */
ibhdr->proto = net_protocol->net_proto;
ibhdr->reserved = 0;
( void ) ll_dest;
/* Hand off to network device */
return netdev_tx ( netdev, iobuf );
}
/**
* Process received Infiniband packet
*
* @v iobuf I/O buffer
* @v netdev Network device
*
* Strips off the Infiniband link-layer header and passes up to the
* network-layer protocol.
*/
static int ib_rx ( struct io_buffer *iobuf, struct net_device *netdev ) {
struct ibhdr *ibhdr = iobuf->data;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( *ibhdr ) ) {
DBG ( "Infiniband packet too short (%d bytes)\n",
iob_len ( iobuf ) );
free_iob ( iobuf );
return -EINVAL;
}
/* Strip off Infiniband header */
iob_pull ( iobuf, sizeof ( *ibhdr ) );
/* Hand off to network-layer protocol */
return net_rx ( iobuf, netdev, ibhdr->proto, NULL );
}
/**
* Transcribe Infiniband address
*
* @v ll_addr Link-layer address
* @ret string Link-layer address in human-readable format
*/
const char * ib_ntoa ( const void *ll_addr ) {
static char buf[61];
const uint8_t *ib_addr = ll_addr;
unsigned int i;
char *p = buf;
for ( i = 0 ; i < IB_ALEN ; i++ ) {
p += sprintf ( p, ":%02x", ib_addr[i] );
}
return ( buf + 1 );
}
/** Infiniband protocol */
struct ll_protocol infiniband_protocol __ll_protocol = {
.name = "Infiniband",
.ll_proto = htons ( ARPHRD_INFINIBAND ),
.ll_addr_len = IB_ALEN,
.ll_header_len = IB_HLEN,
.ll_broadcast = ib_broadcast,
.tx = ib_tx,
.rx = ib_rx,
.ntoa = ib_ntoa,
};
