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rdma: SVCRDMA Transport Module
This file implements the RDMA transport module initialization and termination logic and registers the transport sysctl variables. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Tom Tucker
J. Bruce Fields
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/*
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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/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/sysctl.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 = RPCRDMA_ORD;
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static unsigned int min_ord = 1;
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static unsigned int max_ord = 4096;
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unsigned int svcrdma_max_requests = RPCRDMA_MAX_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_MAX_REQ_SIZE;
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static unsigned int min_max_inline = 4096;
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static unsigned int max_max_inline = 65536;
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atomic_t rdma_stat_recv;
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atomic_t rdma_stat_read;
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atomic_t rdma_stat_write;
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atomic_t rdma_stat_sq_starve;
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atomic_t rdma_stat_rq_starve;
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atomic_t rdma_stat_rq_poll;
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atomic_t rdma_stat_rq_prod;
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atomic_t rdma_stat_sq_poll;
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atomic_t rdma_stat_sq_prod;
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/*
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* This function implements reading and resetting an atomic_t stat
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* variable through read/write to a proc file. Any write to the file
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* resets the associated statistic to zero. Any read returns it's
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* current value.
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*/
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static int read_reset_stat(ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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atomic_t *stat = (atomic_t *)table->data;
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if (!stat)
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return -EINVAL;
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if (write)
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atomic_set(stat, 0);
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else {
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char str_buf[32];
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char *data;
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int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
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if (len >= 32)
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return -EFAULT;
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len = strlen(str_buf);
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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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data = &str_buf[*ppos];
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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 && copy_to_user(buffer, str_buf, len))
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return -EFAULT;
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*lenp = len;
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*ppos += len;
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}
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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 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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.strategy = &sysctl_intvec,
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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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.strategy = &sysctl_intvec,
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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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.strategy = &sysctl_intvec,
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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 = &rdma_stat_read,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_recv",
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.data = &rdma_stat_recv,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_write",
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.data = &rdma_stat_write,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_sq_starve",
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.data = &rdma_stat_sq_starve,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_rq_starve",
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.data = &rdma_stat_rq_starve,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_rq_poll",
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.data = &rdma_stat_rq_poll,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_rq_prod",
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.data = &rdma_stat_rq_prod,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_sq_poll",
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.data = &rdma_stat_sq_poll,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.procname = "rdma_stat_sq_prod",
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.data = &rdma_stat_sq_prod,
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.maxlen = sizeof(atomic_t),
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.mode = 0644,
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.proc_handler = &read_reset_stat,
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},
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{
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.ctl_name = 0,
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},
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};
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static 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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.ctl_name = 0,
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},
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};
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static ctl_table svcrdma_root_table[] = {
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{
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.ctl_name = CTL_SUNRPC,
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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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.ctl_name = 0,
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},
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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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if (svcrdma_table_header) {
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unregister_sysctl_table(svcrdma_table_header);
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svcrdma_table_header = NULL;
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}
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svc_unreg_xprt_class(&svc_rdma_class);
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}
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int svc_rdma_init(void)
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{
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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 : %d\n", svcrdma_max_requests);
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dprintk("\tsq_depth : %d\n",
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svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
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dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
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if (!svcrdma_table_header)
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svcrdma_table_header =
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register_sysctl_table(svcrdma_root_table);
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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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MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
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MODULE_DESCRIPTION("SVC RDMA Transport");
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MODULE_LICENSE("Dual BSD/GPL");
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module_init(svc_rdma_init);
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module_exit(svc_rdma_cleanup);
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