ib_sysctl.c 4.0 KB

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