vipdestroyptag.c

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/********************************************************
 * Myricom VI-GM  networking software and documentation *
 * Copyright (c) 2001 by Myricom, Inc.                  *
 * All rights reserved.                                 *
 * See the file `COPYING' for copyright notice.         *
 ********************************************************/

#include "vipl_priv.h"


VIP_ENTRY_POINT VIP_RETURN
VipDestroyPtag (VIP_NIC_HANDLE NicHandle, VIP_PROTECTION_HANDLE ProtectionTag)
{
  VIP_PTAG *vip_ptag_ptr;
  VIP_NIC *vip_nic_ptr;
  VIP_DEBUG_LABEL (("VipDestroyPtag"));

  /* check nic handle */
  vip_nic_ptr = (VIP_NIC *) NicHandle;
  if (VIP_INVALID_NIC_HANDLE (vip_nic_ptr))
    {
      VIP_DEBUG (("Invalid NIC handle"));
      return VIP_INVALID_PARAMETER;
    }
  VIP_MUTEX_LOCK (&(vip_nic_ptr->lock));

  /* check ptag */
  vip_ptag_ptr = (VIP_PTAG *) ProtectionTag;
  if (VIP_INVALID_PTAG_HANDLE (vip_ptag_ptr))
    {
      VIP_DEBUG (("Invalid PTAG handle"));
      VIP_MUTEX_UNLOCK (&(vip_nic_ptr->lock));
      return VIP_INVALID_PARAMETER;
    }

  /* check ptag/nic association */
  if (vip_ptag_ptr->handle.vip_nic_ptr != vip_nic_ptr)
    {
      VIP_DEBUG (("ProtectionTag not associated with NicHandle"));
      VIP_MUTEX_UNLOCK (&(vip_nic_ptr->lock));
      return VIP_INVALID_PARAMETER;
    }

  /* check ref_count is 0 */
  if (vip_ptag_ptr->handle.ref_count > 0)
    {
      VIP_DEBUG (("PTag still in use"));
      VIP_MUTEX_UNLOCK (&(vip_nic_ptr->lock));
      return VIP_ERROR_RESOURCE;
    }

  /* free the ptag handle */
  vip_free_handle (&(vip_nic_ptr->vip_ptag_set), (VIP_HANDLE *) vip_ptag_ptr);

  VIP_DEBUG (("Success"));
  VIP_MUTEX_UNLOCK (&(vip_nic_ptr->lock));
  return VIP_SUCCESS;
}