PageRenderTime 52ms CodeModel.GetById 28ms RepoModel.GetById 1ms app.codeStats 0ms

/drivers/scsi/libfc/fc_npiv.c

https://bitbucket.org/slukk/jb-tsm-kernel-4.2
C | 158 lines | 80 code | 22 blank | 56 comment | 14 complexity | a002abb66d45932ec689c094f0bf7c66 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1. /*
  2. * Copyright(c) 2009 Intel Corporation. All rights reserved.
  3. *
  4. * This program is free software; you can redistribute it and/or modify it
  5. * under the terms and conditions of the GNU General Public License,
  6. * version 2, as published by the Free Software Foundation.
  7. *
  8. * This program is distributed in the hope it will be useful, but WITHOUT
  9. * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11. * more details.
  12. *
  13. * You should have received a copy of the GNU General Public License along with
  14. * this program; if not, write to the Free Software Foundation, Inc.,
  15. * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16. *
  17. * Maintained at www.Open-FCoE.org
  18. */
  19. /*
  20. * NPIV VN_Port helper functions for libfc
  21. */
  22. #include <scsi/libfc.h>
  23. /**
  24. * fc_vport_create() - Create a new NPIV vport instance
  25. * @vport: fc_vport structure from scsi_transport_fc
  26. * @privsize: driver private data size to allocate along with the Scsi_Host
  27. */
  28. struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
  29. {
  30. struct Scsi_Host *shost = vport_to_shost(vport);
  31. struct fc_lport *n_port = shost_priv(shost);
  32. struct fc_lport *vn_port;
  33. vn_port = libfc_host_alloc(shost->hostt, privsize);
  34. if (!vn_port)
  35. return vn_port;
  36. vn_port->vport = vport;
  37. vport->dd_data = vn_port;
  38. mutex_lock(&n_port->lp_mutex);
  39. list_add_tail(&vn_port->list, &n_port->vports);
  40. mutex_unlock(&n_port->lp_mutex);
  41. return vn_port;
  42. }
  43. EXPORT_SYMBOL(libfc_vport_create);
  44. /**
  45. * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
  46. * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
  47. * @port_id: Fabric ID to find a match for
  48. *
  49. * Returns: matching lport pointer or NULL if there is no match
  50. */
  51. struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
  52. {
  53. struct fc_lport *lport = NULL;
  54. struct fc_lport *vn_port;
  55. if (n_port->port_id == port_id)
  56. return n_port;
  57. if (port_id == FC_FID_FLOGI)
  58. return n_port; /* for point-to-point */
  59. mutex_lock(&n_port->lp_mutex);
  60. list_for_each_entry(vn_port, &n_port->vports, list) {
  61. if (vn_port->port_id == port_id) {
  62. lport = vn_port;
  63. break;
  64. }
  65. }
  66. mutex_unlock(&n_port->lp_mutex);
  67. return lport;
  68. }
  69. EXPORT_SYMBOL(fc_vport_id_lookup);
  70. /*
  71. * When setting the link state of vports during an lport state change, it's
  72. * necessary to hold the lp_mutex of both the N_Port and the VN_Port.
  73. * This tells the lockdep engine to treat the nested locking of the VN_Port
  74. * as a different lock class.
  75. */
  76. enum libfc_lport_mutex_class {
  77. LPORT_MUTEX_NORMAL = 0,
  78. LPORT_MUTEX_VN_PORT = 1,
  79. };
  80. /**
  81. * __fc_vport_setlink() - update link and status on a VN_Port
  82. * @n_port: parent N_Port
  83. * @vn_port: VN_Port to update
  84. *
  85. * Locking: must be called with both the N_Port and VN_Port lp_mutex held
  86. */
  87. static void __fc_vport_setlink(struct fc_lport *n_port,
  88. struct fc_lport *vn_port)
  89. {
  90. struct fc_vport *vport = vn_port->vport;
  91. if (vn_port->state == LPORT_ST_DISABLED)
  92. return;
  93. if (n_port->state == LPORT_ST_READY) {
  94. if (n_port->npiv_enabled) {
  95. fc_vport_set_state(vport, FC_VPORT_INITIALIZING);
  96. __fc_linkup(vn_port);
  97. } else {
  98. fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);
  99. __fc_linkdown(vn_port);
  100. }
  101. } else {
  102. fc_vport_set_state(vport, FC_VPORT_LINKDOWN);
  103. __fc_linkdown(vn_port);
  104. }
  105. }
  106. /**
  107. * fc_vport_setlink() - update link and status on a VN_Port
  108. * @vn_port: virtual port to update
  109. */
  110. void fc_vport_setlink(struct fc_lport *vn_port)
  111. {
  112. struct fc_vport *vport = vn_port->vport;
  113. struct Scsi_Host *shost = vport_to_shost(vport);
  114. struct fc_lport *n_port = shost_priv(shost);
  115. mutex_lock(&n_port->lp_mutex);
  116. mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
  117. __fc_vport_setlink(n_port, vn_port);
  118. mutex_unlock(&vn_port->lp_mutex);
  119. mutex_unlock(&n_port->lp_mutex);
  120. }
  121. EXPORT_SYMBOL(fc_vport_setlink);
  122. /**
  123. * fc_vports_linkchange() - change the link state of all vports
  124. * @n_port: Parent N_Port that has changed state
  125. *
  126. * Locking: called with the n_port lp_mutex held
  127. */
  128. void fc_vports_linkchange(struct fc_lport *n_port)
  129. {
  130. struct fc_lport *vn_port;
  131. list_for_each_entry(vn_port, &n_port->vports, list) {
  132. mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);
  133. __fc_vport_setlink(n_port, vn_port);
  134. mutex_unlock(&vn_port->lp_mutex);
  135. }
  136. }