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c6226ff9a6
Clean up. We are not permitted to remove old proc files. Instead, convert these variables to stubs that are only ever allowed to display a value of zero. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
300 lines
8.1 KiB
C
300 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (c) 2015-2018 Oracle. All rights reserved.
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* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/sysctl.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/svc_rdma.h>
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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/* RPC/RDMA parameters */
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unsigned int svcrdma_ord = 16; /* historical default */
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static unsigned int min_ord = 1;
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static unsigned int max_ord = 255;
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unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
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unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
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static unsigned int min_max_requests = 4;
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static unsigned int max_max_requests = 16384;
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unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
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static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
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static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
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static unsigned int svcrdma_stat_unused;
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static unsigned int zero;
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struct percpu_counter svcrdma_stat_read;
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struct percpu_counter svcrdma_stat_recv;
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struct percpu_counter svcrdma_stat_sq_starve;
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struct percpu_counter svcrdma_stat_write;
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enum {
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SVCRDMA_COUNTER_BUFSIZ = sizeof(unsigned long long),
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};
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static int svcrdma_counter_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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struct percpu_counter *stat = (struct percpu_counter *)table->data;
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char tmp[SVCRDMA_COUNTER_BUFSIZ + 1];
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int len;
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if (write) {
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percpu_counter_set(stat, 0);
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return 0;
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}
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len = snprintf(tmp, SVCRDMA_COUNTER_BUFSIZ, "%lld\n",
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percpu_counter_sum_positive(stat));
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if (len >= SVCRDMA_COUNTER_BUFSIZ)
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return -EFAULT;
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len = strlen(tmp);
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if (*ppos > len) {
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*lenp = 0;
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return 0;
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}
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len -= *ppos;
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if (len > *lenp)
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len = *lenp;
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if (len)
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memcpy(buffer, tmp, len);
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*lenp = len;
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*ppos += len;
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return 0;
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}
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static struct ctl_table_header *svcrdma_table_header;
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static struct ctl_table svcrdma_parm_table[] = {
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{
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.procname = "max_requests",
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.data = &svcrdma_max_requests,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_max_requests,
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.extra2 = &max_max_requests
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},
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{
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.procname = "max_req_size",
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.data = &svcrdma_max_req_size,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_max_inline,
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.extra2 = &max_max_inline
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},
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{
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.procname = "max_outbound_read_requests",
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.data = &svcrdma_ord,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_ord,
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.extra2 = &max_ord,
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},
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{
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.procname = "rdma_stat_read",
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.data = &svcrdma_stat_read,
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.maxlen = SVCRDMA_COUNTER_BUFSIZ,
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.mode = 0644,
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.proc_handler = svcrdma_counter_handler,
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},
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{
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.procname = "rdma_stat_recv",
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.data = &svcrdma_stat_recv,
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.maxlen = SVCRDMA_COUNTER_BUFSIZ,
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.mode = 0644,
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.proc_handler = svcrdma_counter_handler,
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},
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{
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.procname = "rdma_stat_write",
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.data = &svcrdma_stat_write,
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.maxlen = SVCRDMA_COUNTER_BUFSIZ,
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.mode = 0644,
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.proc_handler = svcrdma_counter_handler,
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},
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{
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.procname = "rdma_stat_sq_starve",
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.data = &svcrdma_stat_sq_starve,
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.maxlen = SVCRDMA_COUNTER_BUFSIZ,
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.mode = 0644,
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.proc_handler = svcrdma_counter_handler,
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},
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{
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.procname = "rdma_stat_rq_starve",
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.data = &svcrdma_stat_unused,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &zero,
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},
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{
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.procname = "rdma_stat_rq_poll",
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.data = &svcrdma_stat_unused,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &zero,
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},
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{
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.procname = "rdma_stat_rq_prod",
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.data = &svcrdma_stat_unused,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &zero,
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},
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{
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.procname = "rdma_stat_sq_poll",
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.data = &svcrdma_stat_unused,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &zero,
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},
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{
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.procname = "rdma_stat_sq_prod",
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.data = &svcrdma_stat_unused,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &zero,
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},
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{ },
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};
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static struct ctl_table svcrdma_table[] = {
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{
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.procname = "svc_rdma",
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.mode = 0555,
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.child = svcrdma_parm_table
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},
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{ },
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};
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static struct ctl_table svcrdma_root_table[] = {
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{
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.procname = "sunrpc",
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.mode = 0555,
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.child = svcrdma_table
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},
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{ },
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};
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static void svc_rdma_proc_cleanup(void)
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{
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if (!svcrdma_table_header)
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return;
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unregister_sysctl_table(svcrdma_table_header);
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svcrdma_table_header = NULL;
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percpu_counter_destroy(&svcrdma_stat_write);
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percpu_counter_destroy(&svcrdma_stat_sq_starve);
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percpu_counter_destroy(&svcrdma_stat_recv);
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percpu_counter_destroy(&svcrdma_stat_read);
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}
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static int svc_rdma_proc_init(void)
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{
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int rc;
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if (svcrdma_table_header)
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return 0;
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rc = percpu_counter_init(&svcrdma_stat_read, 0, GFP_KERNEL);
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if (rc)
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goto out_err;
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rc = percpu_counter_init(&svcrdma_stat_recv, 0, GFP_KERNEL);
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if (rc)
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goto out_err;
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rc = percpu_counter_init(&svcrdma_stat_sq_starve, 0, GFP_KERNEL);
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if (rc)
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goto out_err;
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rc = percpu_counter_init(&svcrdma_stat_write, 0, GFP_KERNEL);
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if (rc)
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goto out_err;
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svcrdma_table_header = register_sysctl_table(svcrdma_root_table);
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return 0;
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out_err:
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percpu_counter_destroy(&svcrdma_stat_sq_starve);
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percpu_counter_destroy(&svcrdma_stat_recv);
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percpu_counter_destroy(&svcrdma_stat_read);
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return rc;
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}
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void svc_rdma_cleanup(void)
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{
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dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
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svc_unreg_xprt_class(&svc_rdma_class);
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svc_rdma_proc_cleanup();
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}
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int svc_rdma_init(void)
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{
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int rc;
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dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
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dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
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dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
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dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
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dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
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rc = svc_rdma_proc_init();
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if (rc)
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return rc;
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/* Register RDMA with the SVC transport switch */
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svc_reg_xprt_class(&svc_rdma_class);
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return 0;
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}
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