82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
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* All rights reserved
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* www.brocade.com
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*
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* Linux driver for Brocade Fibre Channel Host Bus Adapter.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License (GPL) Version 2 as
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* published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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/**
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* bfa_q.h Circular queue definitions.
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*/
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#ifndef __BFA_Q_H__
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#define __BFA_Q_H__
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#define bfa_q_first(_q) ((void *)(((struct list_head *) (_q))->next))
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#define bfa_q_next(_qe) (((struct list_head *) (_qe))->next)
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#define bfa_q_prev(_qe) (((struct list_head *) (_qe))->prev)
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/*
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* bfa_q_qe_init - to initialize a queue element
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*/
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#define bfa_q_qe_init(_qe) { \
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bfa_q_next(_qe) = (struct list_head *) NULL; \
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bfa_q_prev(_qe) = (struct list_head *) NULL; \
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}
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/*
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* bfa_q_deq - dequeue an element from head of the queue
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*/
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#define bfa_q_deq(_q, _qe) { \
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if (!list_empty(_q)) { \
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(*((struct list_head **) (_qe))) = bfa_q_next(_q); \
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bfa_q_prev(bfa_q_next(*((struct list_head **) _qe))) = \
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(struct list_head *) (_q); \
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bfa_q_next(_q) = bfa_q_next(*((struct list_head **) _qe)); \
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BFA_Q_DBG_INIT(*((struct list_head **) _qe)); \
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} else { \
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*((struct list_head **) (_qe)) = (struct list_head *) NULL; \
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} \
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}
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/*
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* bfa_q_deq_tail - dequeue an element from tail of the queue
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*/
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#define bfa_q_deq_tail(_q, _qe) { \
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if (!list_empty(_q)) { \
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*((struct list_head **) (_qe)) = bfa_q_prev(_q); \
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bfa_q_next(bfa_q_prev(*((struct list_head **) _qe))) = \
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(struct list_head *) (_q); \
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bfa_q_prev(_q) = bfa_q_prev(*(struct list_head **) _qe); \
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BFA_Q_DBG_INIT(*((struct list_head **) _qe)); \
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} else { \
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*((struct list_head **) (_qe)) = (struct list_head *) NULL; \
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} \
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}
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/*
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* #ifdef BFA_DEBUG (Using bfa_assert to check for debug_build is not
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* consistent across modules)
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*/
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#ifndef BFA_PERF_BUILD
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#define BFA_Q_DBG_INIT(_qe) bfa_q_qe_init(_qe)
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#else
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#define BFA_Q_DBG_INIT(_qe)
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#endif
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#define bfa_q_is_on_q(_q, _qe) \
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bfa_q_is_on_q_func(_q, (struct list_head *)(_qe))
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extern int bfa_q_is_on_q_func(struct list_head *q, struct list_head *qe);
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#endif
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