tbf: Add check_polling/set_polling

Currently the checks for and the actual polling is done in several
places by copy & paste of several lines of code. This hinders changes
of they polling is handled internally and also is likely source of
programming mistakes.

Separate this into a check_polling function, that checks whether
polling is possible and returns the FN and the RRBP to be used in
that case. Otherwise the cause is logged (LOGL_DEBUG) and a negative
error value is returned. There are no other side effect beside the
logging.

If the call is successful, the set_polling method can be used to
actually register the polling.

Extend the encoder functions' parameters lists by an rrbp parameter.

Sponsored-by: On-Waves ehf

1 files changed, 3 insertions, 0 deletions

diff --git a/src/tbf.h b/src/tbf.h
index d23cf933..edb8280e 100644
--- a/src/tbf.h
+++ b/src/tbf.h
@@ -119,6 +119,9 @@ struct gprs_rlcmac_tbf {
 	void stop_t3191();
 	int establish_dl_tbf_on_pacch();
 
+	int check_polling(uint32_t fn, uint8_t ts,
+		uint32_t *poll_fn, unsigned int *rrbp);
+	void set_polling(uint32_t poll_fn, uint8_t ts);
 	void poll_timeout();
 
 	/** tlli handling */