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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2015-2018 Oracle. All rights reserved.
* Copyright (c) 2005-2006 Network Appliance, Inc. 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 BSD-type
* 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.
*
* Neither the name of the Network Appliance, Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author: Tom Tucker <tom@opengridcomputing.com>
*/
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/sysctl.h>
#include <linux/workqueue.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/svc_rdma.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
/* RPC/RDMA parameters */
unsigned int svcrdma_ord = 16; /* historical default */
static unsigned int min_ord = 1;
static unsigned int max_ord = 255;
unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
static unsigned int min_max_requests = 4;
static unsigned int max_max_requests = 16384;
unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
atomic_t rdma_stat_recv;
atomic_t rdma_stat_read;
atomic_t rdma_stat_write;
atomic_t rdma_stat_sq_starve;
atomic_t rdma_stat_rq_starve;
atomic_t rdma_stat_rq_poll;
atomic_t rdma_stat_rq_prod;
atomic_t rdma_stat_sq_poll;
atomic_t rdma_stat_sq_prod;
struct workqueue_struct *svc_rdma_wq;
/*
* This function implements reading and resetting an atomic_t stat
* variable through read/write to a proc file. Any write to the file
* resets the associated statistic to zero. Any read returns it's
* current value.
*/
static int read_reset_stat(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
atomic_t *stat = (atomic_t *)table->data;
if (!stat)
return -EINVAL;
if (write)
atomic_set(stat, 0);
else {
char str_buf[32];
char *data;
int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
if (len >= 32)
return -EFAULT;
len = strlen(str_buf);
if (*ppos > len) {
*lenp = 0;
return 0;
}
data = &str_buf[*ppos];
len -= *ppos;
if (len > *lenp)
len = *lenp;
if (len && copy_to_user(buffer, str_buf, len))
return -EFAULT;
*lenp = len;
*ppos += len;
}
return 0;
}
static struct ctl_table_header *svcrdma_table_header;
static struct ctl_table svcrdma_parm_table[] = {
{
.procname = "max_requests",
.data = &svcrdma_max_requests,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_max_requests,
.extra2 = &max_max_requests
},
{
.procname = "max_req_size",
.data = &svcrdma_max_req_size,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_max_inline,
.extra2 = &max_max_inline
},
{
.procname = "max_outbound_read_requests",
.data = &svcrdma_ord,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_ord,
.extra2 = &max_ord,
},
{
.procname = "rdma_stat_read",
.data = &rdma_stat_read,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_recv",
.data = &rdma_stat_recv,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_write",
.data = &rdma_stat_write,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_sq_starve",
.data = &rdma_stat_sq_starve,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_rq_starve",
.data = &rdma_stat_rq_starve,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_rq_poll",
.data = &rdma_stat_rq_poll,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_rq_prod",
.data = &rdma_stat_rq_prod,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_sq_poll",
.data = &rdma_stat_sq_poll,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{
.procname = "rdma_stat_sq_prod",
.data = &rdma_stat_sq_prod,
.maxlen = sizeof(atomic_t),
.mode = 0644,
.proc_handler = read_reset_stat,
},
{ },
};
static struct ctl_table svcrdma_table[] = {
{
.procname = "svc_rdma",
.mode = 0555,
.child = svcrdma_parm_table
},
{ },
};
static struct ctl_table svcrdma_root_table[] = {
{
.procname = "sunrpc",
.mode = 0555,
.child = svcrdma_table
},
{ },
};
void svc_rdma_cleanup(void)
{
dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
destroy_workqueue(svc_rdma_wq);
if (svcrdma_table_header) {
unregister_sysctl_table(svcrdma_table_header);
svcrdma_table_header = NULL;
}
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
svc_unreg_xprt_class(&svc_rdma_bc_class);
#endif
svc_unreg_xprt_class(&svc_rdma_class);
}
int svc_rdma_init(void)
{
dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
if (!svc_rdma_wq)
return -ENOMEM;
if (!svcrdma_table_header)
svcrdma_table_header =
register_sysctl_table(svcrdma_root_table);
/* Register RDMA with the SVC transport switch */
svc_reg_xprt_class(&svc_rdma_class);
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
svc_reg_xprt_class(&svc_rdma_bc_class);
#endif
return 0;
}
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