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/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* This file contains code imported from the OFED rds source file info.c
* Oracle elects to have and use the contents of info.c under and governed
* by the OpenIB.org BSD license (see below for full license text). However,
* the following notice accompanied the original version of this file:
*/
/*
* Copyright (c) 2006 Oracle. 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 <sys/rds.h>
#include <sys/ib/clients/rdsv3/rdsv3.h>
#include <sys/ib/clients/rdsv3/rdsv3_debug.h>
/*
* This file implements a getsockopt() call which copies a set of fixed
* sized structs into a user-specified buffer as a means of providing
* read-only information about RDS.
*
* For a given information source there are a given number of fixed sized
* structs at a given time. The structs are only copied if the user-specified
* buffer is big enough. The destination pages that make up the buffer
* are pinned for the duration of the copy.
*
* This gives us the following benefits:
*
* - simple implementation, no copy "position" across multiple calls
* - consistent snapshot of an info source
* - atomic copy works well with whatever locking info source has
* - one portable tool to get rds info across implementations
* - long-lived tool can get info without allocating
*
* at the following costs:
*
* - info source copy must be pinned, may be "large"
*/
static kmutex_t rdsv3_info_lock;
static rdsv3_info_func rdsv3_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];
void
rdsv3_info_register_func(int optname, rdsv3_info_func func)
{
int offset = optname - RDS_INFO_FIRST;
ASSERT(optname >= RDS_INFO_FIRST && optname <= RDS_INFO_LAST);
mutex_enter(&rdsv3_info_lock);
ASSERT(!rdsv3_info_funcs[offset]);
rdsv3_info_funcs[offset] = func;
mutex_exit(&rdsv3_info_lock);
}
/* ARGSUSED */
void
rdsv3_info_deregister_func(int optname, rdsv3_info_func func)
{
int offset = optname - RDS_INFO_FIRST;
ASSERT(optname >= RDS_INFO_FIRST && optname <= RDS_INFO_LAST);
mutex_enter(&rdsv3_info_lock);
rdsv3_info_funcs[offset] = NULL;
mutex_exit(&rdsv3_info_lock);
}
/*
* @optval points to the userspace buffer that the information snapshot
* will be copied into.
*
* This function returns -errno if there is a failure, particularly -ENOSPC
* if the given userspace buffer was not large enough to fit the snapshot.
* On success it returns the positive number of bytes of each array element
* in the snapshot.
*/
int
rdsv3_info_ioctl(struct rsock *sock, int optname, char *optval,
int32_t *rvalp)
{
struct rdsv3_info_iterator iter;
struct rdsv3_info_lengths lens;
rdsv3_info_func func;
struct rds_info_arg arg;
uint32_t ulen = 0, klen;
func = rdsv3_info_funcs[optname - RDS_INFO_FIRST];
if (func == NULL) {
RDSV3_DPRINTF2("rdsv3_info_ioctl",
"No Info Function, optname: %d", optname);
return (ENOPROTOOPT);
}
if (optval == NULL) {
RDSV3_DPRINTF2("rdsv3_info_ioctl", "optval is NULL");
return (EINVAL);
}
if (ddi_copyin(optval, &arg, sizeof (struct rds_info_arg), 0) != 0) {
RDSV3_DPRINTF2("rdsv3_info_ioctl",
"ddi_copyin for address: 0x%p failed", optval);
return (EFAULT);
}
RDSV3_DPRINTF4("rdsv3_info_ioctl",
"optname: %d lenp: %llx datap: %llx", optname, arg.lenp, arg.datap);
if (arg.lenp == (uintptr_t)NULL) {
RDSV3_DPRINTF2("rdsv3_info_ioctl", "arg.lenp is NULL");
return (EFAULT);
}
if (ddi_copyin((void *)(uintptr_t)arg.lenp, &ulen,
sizeof (uint32_t), 0) != 0) {
RDSV3_DPRINTF2("rdsv3_info_ioctl",
"ddi_copyin for address, lenp: 0x%p failed", arg.lenp);
return (EFAULT);
}
RDSV3_DPRINTF3("rdsv3_info_ioctl", "optname: %d len: %d datap: %p",
optname, ulen, arg.datap);
bzero(&iter, sizeof (struct rdsv3_info_iterator));
/* a 0 len call is just trying to probe its length */
if (ulen == 0) {
iter.addr = NULL;
} else if (arg.datap == (uintptr_t)NULL) {
RDSV3_DPRINTF2("rdsv3_info_ioctl",
"arg.datap is NULL, ulen set to: %d", ulen);
return (EINVAL);
} else {
iter.addr = (char *)(uintptr_t)arg.datap;
}
iter.offset = 0;
bzero(&lens, sizeof (struct rdsv3_info_lengths));
func(sock, ulen, &iter, &lens);
klen = lens.nr * lens.each;
if (ddi_copyout(&klen, (void *)(uintptr_t)arg.lenp,
sizeof (uint32_t), 0) != 0) {
RDSV3_DPRINTF2("rdsv3_info_ioctl",
"ddi_copyout(%p %p) failed", &klen, arg.lenp);
return (EFAULT);
}
RDSV3_DPRINTF3("rdsv3_info_ioctl",
"optname: %d ulen: %d klen: %d each: %d", optname, ulen, klen,
lens.each);
if (ulen < klen) {
return (ENOSPC);
}
RDSV3_DPRINTF4("rdsv3_info_ioctl", "Return optname: %d", optname);
*rvalp = lens.each;
return (0);
}
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