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Linux/net/batman-adv/bitarray.h

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  1 /* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
  2  *
  3  * Simon Wunderlich, Marek Lindner
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of version 2 of the GNU General Public
  7  * License as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 12  * General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #ifndef _NET_BATMAN_ADV_BITARRAY_H_
 19 #define _NET_BATMAN_ADV_BITARRAY_H_
 20 
 21 /* Returns 1 if the corresponding bit in the given seq_bits indicates true
 22  * and curr_seqno is within range of last_seqno. Otherwise returns 0.
 23  */
 24 static inline int batadv_test_bit(const unsigned long *seq_bits,
 25                                   uint32_t last_seqno, uint32_t curr_seqno)
 26 {
 27         int32_t diff;
 28 
 29         diff = last_seqno - curr_seqno;
 30         if (diff < 0 || diff >= BATADV_TQ_LOCAL_WINDOW_SIZE)
 31                 return 0;
 32         return test_bit(diff, seq_bits) != 0;
 33 }
 34 
 35 /* turn corresponding bit on, so we can remember that we got the packet */
 36 static inline void batadv_set_bit(unsigned long *seq_bits, int32_t n)
 37 {
 38         /* if too old, just drop it */
 39         if (n < 0 || n >= BATADV_TQ_LOCAL_WINDOW_SIZE)
 40                 return;
 41 
 42         set_bit(n, seq_bits); /* turn the position on */
 43 }
 44 
 45 /* receive and process one packet, returns 1 if received seq_num is considered
 46  * new, 0 if old
 47  */
 48 int batadv_bit_get_packet(void *priv, unsigned long *seq_bits,
 49                           int32_t seq_num_diff, int set_mark);
 50 
 51 #endif /* _NET_BATMAN_ADV_BITARRAY_H_ */
 52 

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