| 1 | |
| 2 | * Copyright (c) 2006 Oracle. All rights reserved.
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| 3 | *
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| 4 | * This software is available to you under a choice of one of two
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| 5 | * licenses. You may choose to be licensed under the terms of the GNU
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| 6 | * General Public License (GPL) Version 2, available from the file
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| 7 | * COPYING in the main directory of this source tree, or the
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| 8 | * OpenIB.org BSD license below:
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or
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| 11 | * without modification, are permitted provided that the following
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| 12 | * conditions are met:
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| 13 | *
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| 14 | * - Redistributions of source code must retain the above
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| 15 | * copyright notice, this list of conditions and the following
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| 16 | * disclaimer.
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| 17 | *
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| 18 | * - Redistributions in binary form must reproduce the above
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| 19 | * copyright notice, this list of conditions and the following
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| 20 | * disclaimer in the documentation and/or other materials
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| 21 | * provided with the distribution.
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| 22 | *
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| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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| 30 | * SOFTWARE.
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| 31 | *
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| 32 |
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| 33 | #include <linux/kernel.h>
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| 34 | #include <linux/sysctl.h>
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| 35 | #include <linux/proc_fs.h>
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| 36 |
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| 37 | #include "ib.h"
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| 38 |
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| 39 | static struct ctl_table_header *rds_ib_sysctl_hdr;
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| 40 |
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| 41 | unsigned long rds_ib_sysctl_max_send_wr = RDS_IB_DEFAULT_SEND_WR;
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| 42 | unsigned long rds_ib_sysctl_max_recv_wr = RDS_IB_DEFAULT_RECV_WR;
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| 43 | unsigned long rds_ib_sysctl_max_recv_allocation = (128 * 1024 * 1024) / RDS_FRAG_SIZE;
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| 44 | static unsigned long rds_ib_sysctl_max_wr_min = 1;
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| 45 |
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| 46 | static unsigned long rds_ib_sysctl_max_wr_max = (u32)~0;
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| 47 |
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| 48 | unsigned long rds_ib_sysctl_max_unsig_wrs = 16;
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| 49 | static unsigned long rds_ib_sysctl_max_unsig_wr_min = 1;
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| 50 | static unsigned long rds_ib_sysctl_max_unsig_wr_max = 64;
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| 51 |
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| 52 | |
| 53 | * This sysctl does nothing.
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| 54 | *
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| 55 | * Backwards compatibility with RDS 3.0 wire protocol
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| 56 | * disables initial FC credit exchange.
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| 57 | * If it's ever possible to drop 3.0 support,
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| 58 | * setting this to 1 and moving init/refill of send/recv
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| 59 | * rings from ib_cm_connect_complete() back into ib_setup_qp()
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| 60 | * will cause credits to be added before protocol negotiation.
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| 61 |
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| 62 | unsigned int rds_ib_sysctl_flow_control = 0;
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| 63 |
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| 64 | static struct ctl_table rds_ib_sysctl_table[] = {
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| 65 | {
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| 66 | .procname = "max_send_wr",
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| 67 | .data = &rds_ib_sysctl_max_send_wr,
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| 68 | .maxlen = sizeof(unsigned long),
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| 69 | .mode = 0644,
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| 70 | .proc_handler = proc_doulongvec_minmax,
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| 71 | .extra1 = &rds_ib_sysctl_max_wr_min,
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| 72 | .extra2 = &rds_ib_sysctl_max_wr_max,
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| 73 | },
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| 74 | {
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| 75 | .procname = "max_recv_wr",
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| 76 | .data = &rds_ib_sysctl_max_recv_wr,
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| 77 | .maxlen = sizeof(unsigned long),
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| 78 | .mode = 0644,
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| 79 | .proc_handler = proc_doulongvec_minmax,
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| 80 | .extra1 = &rds_ib_sysctl_max_wr_min,
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| 81 | .extra2 = &rds_ib_sysctl_max_wr_max,
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| 82 | },
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| 83 | {
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| 84 | .procname = "max_unsignaled_wr",
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| 85 | .data = &rds_ib_sysctl_max_unsig_wrs,
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| 86 | .maxlen = sizeof(unsigned long),
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| 87 | .mode = 0644,
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| 88 | .proc_handler = proc_doulongvec_minmax,
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| 89 | .extra1 = &rds_ib_sysctl_max_unsig_wr_min,
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| 90 | .extra2 = &rds_ib_sysctl_max_unsig_wr_max,
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| 91 | },
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| 92 | {
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| 93 | .procname = "max_recv_allocation",
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| 94 | .data = &rds_ib_sysctl_max_recv_allocation,
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| 95 | .maxlen = sizeof(unsigned long),
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| 96 | .mode = 0644,
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| 97 | .proc_handler = proc_doulongvec_minmax,
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| 98 | },
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| 99 | {
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| 100 | .procname = "flow_control",
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| 101 | .data = &rds_ib_sysctl_flow_control,
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| 102 | .maxlen = sizeof(rds_ib_sysctl_flow_control),
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| 103 | .mode = 0644,
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| 104 | .proc_handler = proc_dointvec,
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| 105 | },
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| 106 | };
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| 107 |
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| 108 | void rds_ib_sysctl_exit(void)
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| 109 | {
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| 110 | if (rds_ib_sysctl_hdr)
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| 111 | unregister_net_sysctl_table(rds_ib_sysctl_hdr);
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| 112 | }
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| 113 |
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| 114 | int rds_ib_sysctl_init(void)
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| 115 | {
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| 116 | rds_ib_sysctl_hdr = register_net_sysctl(&init_net, "net/rds/ib", rds_ib_sysctl_table);
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| 117 | if (!rds_ib_sysctl_hdr)
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| 118 | return -ENOMEM;
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| 119 | return 0;
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| 120 | }
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