batman-adv: move smallest_signed_int(), seq_before() and seq_after() into main.h
smallest_signed_int(), seq_before() and seq_after() are very useful functions that help to handle comparisons between sequence numbers. However they were only defined in vis.c. With this patch every batman-adv function will be able to use them. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
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@ -182,4 +182,20 @@ static inline int compare_eth(const void *data1, const void *data2)
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#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
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/* Returns the smallest signed integer in two's complement with the sizeof x */
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#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
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/* Checks if a sequence number x is a predecessor/successor of y.
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* they handle overflows/underflows and can correctly check for a
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* predecessor/successor unless the variable sequence number has grown by
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* more then 2**(bitwidth(x)-1)-1.
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* This means that for a uint8_t with the maximum value 255, it would think:
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* - when adding nothing - it is neither a predecessor nor a successor
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* - before adding more than 127 to the starting value - it is a predecessor,
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* - when adding 128 - it is neither a predecessor nor a successor,
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* - after adding more than 127 to the starting value - it is a successor */
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#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \
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_dummy > smallest_signed_int(_dummy); })
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#define seq_after(x, y) seq_before(y, x)
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#endif /* _NET_BATMAN_ADV_MAIN_H_ */
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@ -30,22 +30,6 @@
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#define MAX_VIS_PACKET_SIZE 1000
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/* Returns the smallest signed integer in two's complement with the sizeof x */
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#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
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/* Checks if a sequence number x is a predecessor/successor of y.
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* they handle overflows/underflows and can correctly check for a
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* predecessor/successor unless the variable sequence number has grown by
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* more then 2**(bitwidth(x)-1)-1.
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* This means that for a uint8_t with the maximum value 255, it would think:
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* - when adding nothing - it is neither a predecessor nor a successor
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* - before adding more than 127 to the starting value - it is a predecessor,
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* - when adding 128 - it is neither a predecessor nor a successor,
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* - after adding more than 127 to the starting value - it is a successor */
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#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \
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_dummy > smallest_signed_int(_dummy); })
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#define seq_after(x, y) seq_before(y, x)
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static void start_vis_timer(struct bat_priv *bat_priv);
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/* free the info */
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