162 lines
4.2 KiB
C
Executable file
162 lines
4.2 KiB
C
Executable file
/*
|
|
* Copyright (c) 2006, 2017 Oracle and/or its affiliates. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/in.h>
|
|
#include <linux/ipv6.h>
|
|
|
|
#include "rds.h"
|
|
#include "loop.h"
|
|
|
|
static struct rds_transport *transports[RDS_TRANS_COUNT];
|
|
static DECLARE_RWSEM(rds_trans_sem);
|
|
|
|
void rds_trans_register(struct rds_transport *trans)
|
|
{
|
|
BUG_ON(strlen(trans->t_name) + 1 > TRANSNAMSIZ);
|
|
|
|
down_write(&rds_trans_sem);
|
|
|
|
if (transports[trans->t_type])
|
|
printk(KERN_ERR "RDS Transport type %d already registered\n",
|
|
trans->t_type);
|
|
else {
|
|
transports[trans->t_type] = trans;
|
|
printk(KERN_INFO "Registered RDS/%s transport\n", trans->t_name);
|
|
}
|
|
|
|
up_write(&rds_trans_sem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_trans_register);
|
|
|
|
void rds_trans_unregister(struct rds_transport *trans)
|
|
{
|
|
down_write(&rds_trans_sem);
|
|
|
|
transports[trans->t_type] = NULL;
|
|
printk(KERN_INFO "Unregistered RDS/%s transport\n", trans->t_name);
|
|
|
|
up_write(&rds_trans_sem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rds_trans_unregister);
|
|
|
|
void rds_trans_put(struct rds_transport *trans)
|
|
{
|
|
if (trans)
|
|
module_put(trans->t_owner);
|
|
}
|
|
|
|
struct rds_transport *rds_trans_get_preferred(struct net *net,
|
|
const struct in6_addr *addr,
|
|
__u32 scope_id)
|
|
{
|
|
struct rds_transport *ret = NULL;
|
|
struct rds_transport *trans;
|
|
unsigned int i;
|
|
|
|
if (ipv6_addr_v4mapped(addr)) {
|
|
if (*(u_int8_t *)&addr->s6_addr32[3] == IN_LOOPBACKNET)
|
|
return &rds_loop_transport;
|
|
} else if (ipv6_addr_loopback(addr)) {
|
|
return &rds_loop_transport;
|
|
}
|
|
|
|
down_read(&rds_trans_sem);
|
|
for (i = 0; i < RDS_TRANS_COUNT; i++) {
|
|
trans = transports[i];
|
|
|
|
if (trans && (trans->laddr_check(net, addr, scope_id) == 0) &&
|
|
(!trans->t_owner || try_module_get(trans->t_owner))) {
|
|
ret = trans;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&rds_trans_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct rds_transport *rds_trans_get(int t_type)
|
|
{
|
|
struct rds_transport *ret = NULL;
|
|
struct rds_transport *trans;
|
|
unsigned int i;
|
|
|
|
down_read(&rds_trans_sem);
|
|
for (i = 0; i < RDS_TRANS_COUNT; i++) {
|
|
trans = transports[i];
|
|
|
|
if (trans && trans->t_type == t_type &&
|
|
(!trans->t_owner || try_module_get(trans->t_owner))) {
|
|
ret = trans;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&rds_trans_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This returns the number of stats entries in the snapshot and only
|
|
* copies them using the iter if there is enough space for them. The
|
|
* caller passes in the global stats so that we can size and copy while
|
|
* holding the lock.
|
|
*/
|
|
unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
|
|
unsigned int avail)
|
|
|
|
{
|
|
struct rds_transport *trans;
|
|
unsigned int total = 0;
|
|
unsigned int part;
|
|
int i;
|
|
|
|
rds_info_iter_unmap(iter);
|
|
down_read(&rds_trans_sem);
|
|
|
|
for (i = 0; i < RDS_TRANS_COUNT; i++) {
|
|
trans = transports[i];
|
|
if (!trans || !trans->stats_info_copy)
|
|
continue;
|
|
|
|
part = trans->stats_info_copy(iter, avail);
|
|
avail -= min(avail, part);
|
|
total += part;
|
|
}
|
|
|
|
up_read(&rds_trans_sem);
|
|
|
|
return total;
|
|
}
|