/* * 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/module.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/sysctl.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 = RPCRDMA_ORD; static unsigned int min_ord = 1; static unsigned int max_ord = 4096; unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS; static unsigned int min_max_requests = 4; static unsigned int max_max_requests = 16384; unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE; static unsigned int min_max_inline = 4096; static unsigned int max_max_inline = 65536; 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; /* * 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(ctl_table *table, int write, struct file *filp, 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 ctl_table svcrdma_parm_table[] = { { .procname = "max_requests", .data = &svcrdma_max_requests, .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = &proc_dointvec_minmax, .strategy = &sysctl_intvec, .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, .strategy = &sysctl_intvec, .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, .strategy = &sysctl_intvec, .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, }, { .ctl_name = 0, }, }; static ctl_table svcrdma_table[] = { { .procname = "svc_rdma", .mode = 0555, .child = svcrdma_parm_table }, { .ctl_name = 0, }, }; static ctl_table svcrdma_root_table[] = { { .ctl_name = CTL_SUNRPC, .procname = "sunrpc", .mode = 0555, .child = svcrdma_table }, { .ctl_name = 0, }, }; void svc_rdma_cleanup(void) { dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n"); if (svcrdma_table_header) { unregister_sysctl_table(svcrdma_table_header); svcrdma_table_header = NULL; } 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 : %d\n", svcrdma_max_requests); dprintk("\tsq_depth : %d\n", svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT); dprintk("\tmax_inline : %d\n", svcrdma_max_req_size); 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); return 0; } MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); MODULE_DESCRIPTION("SVC RDMA Transport"); MODULE_LICENSE("Dual BSD/GPL"); module_init(svc_rdma_init); module_exit(svc_rdma_cleanup);