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/*
* Copyright (c) 2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @file
* @brief Circular doubly linked list with head sentinel.
* List entries are allocated out of a "supporting" pool and all pool entries
* must contain a list anchor struct for each list they pertain to.
*/
#ifndef SRC_VPPINFRA_CLIB_LLIST_H_
#define SRC_VPPINFRA_CLIB_LLIST_H_
#include <vppinfra/types.h>
#include <vppinfra/pool.h>
typedef u32 clib_llist_index_t;
typedef struct clib_llist_anchor
{
clib_llist_index_t prev;
clib_llist_index_t next;
} clib_llist_anchor_t;
#define CLIB_LLIST_INVALID_INDEX ((u32)~0)
/**
* Local variable naming macro.
*/
#define _ll_var(v) _llist_##v
/**
* Local macros to grab llist anchor next and prev from pool entry
*/
#define _lnext(E,name) ((E)->name).next
#define _lprev(E,name) ((E)->name).prev
/**
* Get list entry index
*
* @param LP linked list pool
* @param E pool entry
* @return pool entry index
*/
#define clib_llist_entry_index(LP,E) ((E) - (LP))
/**
* Get next pool entry
*
* @param LP linked list pool
* @param name list anchor name
* @param E pool entry
* @return next pool entry
*/
#define clib_llist_next(LP,name,E) pool_elt_at_index((LP),_lnext((E),name))
/**
* Get previous pool entry
*
* @param LP linked list pool
* @param name list anchor name
* @param E pool entry
* @return previous pool entry
*/
#define clib_llist_prev(LP,name,E) pool_elt_at_index((LP),_lprev((E),name))
/**
* Initialize element in llist for entry
*
* @param LP linked list pool
* @param name list anchor name
* @param E entry whose ll anchor is to be initialized
*/
#define clib_llist_anchor_init(LP,name,E) \
do { \
_lprev ((E),name) = clib_llist_entry_index ((LP), (E)); \
_lnext ((E),name) = _lprev ((E),name); \
} while (0)
/**
* Initialize llist head
*
* @param LP linked list pool
* @param name list anchor name
*/
#define clib_llist_make_head(LP,name) \
({ \
typeof (LP) _ll_var (head); \
pool_get_zero ((LP), _ll_var (head)); \
clib_llist_anchor_init ((LP),name,_ll_var (head)); \
clib_llist_entry_index ((LP), _ll_var (head)); \
})
/**
* Check is list is empty
*
* @param LP linked list pool
* @param name list anchor name
* @param H list head
* @return 1 if sentinel is the only node part of the list, 0 otherwise
*/
#define clib_llist_is_empty(LP,name,H) \
(clib_llist_entry_index (LP,H) == (H)->name.next)
/**
* Check if element is linked in a list
*
* @param E list element
* @param name list anchor name
*/
#define clib_llist_elt_is_linked(E,name) \
((E)->name.next != CLIB_LLIST_INVALID_INDEX \
&& (E)->name.prev != CLIB_LLIST_INVALID_INDEX)
/**
* Insert entry between previous and next
*
* Internal use.
*
* @param LP linked list pool
* @param name list anchor name
* @param E new entry
* @param P previous in list
* @param N next in list
*/
#define _llist_insert(LP,name,E,P,N) \
do { \
_lprev (E,name) = _lprev(N,name); \
_lnext (E,name) = _lnext(P,name); \
_lprev ((N),name) = clib_llist_entry_index ((LP),(E)); \
_lnext ((P),name) = clib_llist_entry_index ((LP),(E)); \
} while (0)
/**
* Insert entry after previous
*
* @param LP linked list pool
* @param name list anchor name
* @param E new entry
* @param P previous in list
*/
#define clib_llist_insert(LP,name,E,P) \
do { \
typeof (LP) _ll_var (N) = clib_llist_next (LP,name,P); \
_llist_insert ((LP),name,(E),(P), _ll_var (N)); \
} while (0)
/**
* Add entry after head
*
* @param LP linked list pool
* @param name list anchor name
* @param E new entry
* @param H list head
*/
#define clib_llist_add(LP,name,E,H) clib_llist_insert ((LP),name,(E),(H))
/**
* Add entry after tail
*
* @param LP linked list pool
* @param name list anchor name
* @param E new entry
* @param H list head
*/
#define clib_llist_add_tail(LP,name,E,H) \
do { \
typeof (LP) _ll_var (P) = clib_llist_prev ((LP),name,(H)); \
_llist_insert ((LP),name,(E),_ll_var (P),(H)); \
} while (0)
/**
* Remove entry from list
*
* @param LP linked list pool
* @param name list anchor name
* @param E entry to be removed
*/
#define clib_llist_remove(LP,name,E) \
do { \
ASSERT ((E) != clib_llist_next (LP,name,E));/* don't remove sentinel */\
ASSERT (_lnext (E,name) != CLIB_LLIST_INVALID_INDEX); \
ASSERT (_lprev (E,name) != CLIB_LLIST_INVALID_INDEX); \
typeof (LP) _ll_var (P) = clib_llist_prev ((LP),name,E); \
typeof (LP) _ll_var (N) = clib_llist_next ((LP),name,E); \
_lnext (_ll_var (P),name) = _lnext (E,name); \
_lprev (_ll_var (N),name) = _lprev (E,name); \
_lnext (E,name) = _lprev (E,name) = CLIB_LLIST_INVALID_INDEX; \
}while (0)
/**
* Removes and returns the first element in the list.
*
* The element is not freed. It's the responsability of the caller to
* free it.
*
* @param LP linked list pool
* @param name list anchor name
* @param E storage the first entry
* @param H list head entry
*/
#define clib_llist_pop_first(LP,name,E,H) \
do { \
E = clib_llist_next (LP,name,H); \
clib_llist_remove (LP,name,E); \
} while (0)
/**
* Splice two lists at a given position
*
* List spliced into destination list is left with 0 entries, i.e., head
* is made to point to itself.
*
* @param LP linked list pool
* @param name list anchor name
* @param P position in destination where source list is spliced
* @param H head of source list that will be spliced into destination
*/
#define clib_llist_splice(LP,name,P,H) \
do { \
typeof (LP) _ll_var (fe) = clib_llist_next (LP,name,H); \
if (_ll_var (fe) != (H)) \
{ \
typeof (LP) _ll_var (le) = clib_llist_prev (LP,name,H); \
typeof (LP) _ll_var (ne) = clib_llist_next (LP,name,P); \
_lprev (_ll_var (fe),name) = clib_llist_entry_index(LP,P); \
_lnext (_ll_var (le),name) = clib_llist_entry_index(LP,_ll_var (ne));\
_lnext (P,name) = clib_llist_entry_index (LP,_ll_var (fe)); \
_lprev (_ll_var (ne),name) = clib_llist_entry_index(LP,_ll_var (le));\
_lnext (H,name) = clib_llist_entry_index(LP,H); \
_lprev (H,name) = _lnext (H,name); \
} \
} while (0)
/**
* Walk list starting at head
*
* @param LP linked list pool
* @param name list anchor name
* @param H head entry
* @param E entry iterator
* @param body code to be executed
*/
#define clib_llist_foreach(LP,name,H,E,body) \
do { \
typeof (LP) _ll_var (n); \
(E) = clib_llist_next (LP,name,H); \
while (E != H) \
{ \
_ll_var (n) = clib_llist_next (LP,name,E); \
do { body; } while (0); \
(E) = _ll_var (n); \
} \
} while (0)
/**
* Walk list starting at head in reverse order
*
* @param LP linked list pool
* @param name list anchor name
* @param H head entry
* @param E entry iterator
* @param body code to be executed
*/
#define clib_llist_foreach_reverse(LP,name,H,E,body) \
do { \
typeof (LP) _ll_var (p); \
(E) = clib_llist_prev (LP,name,H); \
while (E != H) \
{ \
_ll_var (p) = clib_llist_prev (LP,name,E); \
do { body; } while (0); \
(E) = _ll_var (p); \
} \
} while (0)
#endif /* SRC_VPPINFRA_CLIB_LLIST_H_ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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