diff options
| -rw-r--r-- | include/osmocom/abis/lapd.h | 9 | ||||
| -rw-r--r-- | src/input/lapd.c | 28 |
2 files changed, 37 insertions, 0 deletions
diff --git a/include/osmocom/abis/lapd.h b/include/osmocom/abis/lapd.h index 2987633..d618187 100644 --- a/include/osmocom/abis/lapd.h +++ b/include/osmocom/abis/lapd.h @@ -18,8 +18,10 @@ struct lapd_profile { int short_address; }; +/* predefined lapd profiles (see lapd.c for definition) */ extern const struct lapd_profile lapd_profile_isdn; extern const struct lapd_profile lapd_profile_abis; +extern const struct lapd_profile lapd_profile_abis_ericsson; extern const struct lapd_profile lapd_profile_sat; struct lapd_instance { @@ -63,6 +65,13 @@ struct lapd_instance *lapd_instance_alloc(int network_side, void *rx_cbdata), void *rx_cbdata, const struct lapd_profile *profile); +/* In rare cases (e.g. Ericsson's lapd dialect), it may be necessary to + * exchange the lapd profile on the fly. lapd_instance_set_profile() + * allwos to set the lapd profile on a lapd instance danymically to + * one of the lapd profiles define above. */ +void lapd_instance_set_profile(struct lapd_instance *li, + const struct lapd_profile *profile); + void lapd_instance_free(struct lapd_instance *li); /* Start a (user-side) SAP for the specified TEI/SAPI on the LAPD instance */ diff --git a/src/input/lapd.c b/src/input/lapd.c index ac24fd8..f5909b4 100644 --- a/src/input/lapd.c +++ b/src/input/lapd.c @@ -95,6 +95,27 @@ const struct lapd_profile lapd_profile_abis = { .short_address = 0 }; +/* Ericssons OM2000 lapd dialect requires a sabm frame retransmission + * timeout of exactly 300 msek. Shorter or longer retransmission will + * cause the link establishment to fail permanently. Since the BTS is + * periodically scanning through all timeslots to find the timeslot + * where the bsc is transmitting its sabm frames the normal maximum + * retransmission (n200) of 3 is not enough. In order not to miss + * the bts, n200 has been increased to 300, which is an educated + * guess. */ + +const struct lapd_profile lapd_profile_abis_ericsson = { + .k = LAPD_SET_K(2,1), + .n200 = 300, + .n201 = 260, + .n202 = 0, /* infinite */ + .t200_sec = 0, .t200_usec = 300000, + .t201_sec = 1, .t201_usec = 0, + .t202_sec = 2, .t202_usec = 0, + .t203_sec = 10, .t203_usec = 0, + .short_address = 0 +}; + const struct lapd_profile lapd_profile_sat = { .k = LAPD_SET_K(15,15), .n200 = 5, @@ -664,6 +685,13 @@ struct lapd_instance *lapd_instance_alloc(int network_side, return li; } +/* Change lapd-profile on the fly (use with caution!) */ +void lapd_instance_set_profile(struct lapd_instance *li, + const struct lapd_profile *profile) +{ + memcpy(&li->profile, profile, sizeof(li->profile)); +} + void lapd_instance_free(struct lapd_instance *li) { struct lapd_tei *teip, *teip2; |