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gsm/lapdm: Set N201 depending on the frame type 

This is part of a set of commit to fix LAPDm to handle datalink
connection on ACCH (SAPI 3)

This is required to transfer SMS on SACCH of TCH/f or SDCCH/8 (4).

Written-by: Andreas Eversberg <jolly@eversberg.eu>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Andreas.Eversberg 2011-11-06 20:43:08 +01:00 committed by Harald Welte
parent 5ac44784b6
commit cbed327965
1 changed files with 5 additions and 5 deletions
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10
src/gsm/lapdm.c
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@ -531,7 +531,7 @@ static int l2_ph_data_ind(struct msgb *msg, struct lapdm_entity *le,
} else {
mctx.lapdm_fmt = LAPDm_FMT_B;
LOGP(DLLAPD, LOGL_INFO, "fmt=B\n");
n201 = 20; // FIXME: select correct size by chan.
n201 = N201_AB_SDCCH;
sapi = (msg->l2h[0] >> 2) & 7;
}
}
@ -743,7 +743,7 @@ static int rslms_rx_rll_est_req(struct msgb *msg, struct lapdm_datalink *dl)
uint8_t sapi = rllh->link_id & 7;
struct tlv_parsed tv;
uint8_t length;
int n201 = 20; //FIXME
uint8_t n201 = (rllh->link_id & 0x40) ? N201_AB_SACCH : N201_AB_SDCCH;
struct osmo_dlsap_prim dp;
/* Set LAPDm context for established connection */
@ -771,9 +771,9 @@ static int rslms_rx_rll_est_req(struct msgb *msg, struct lapdm_datalink *dl)
}
/* check if the layer3 message length exceeds N201 */
if (length + 3 > 21) { /* FIXME: do we know the channel N201? */
if (length > n201) {
LOGP(DLLAPD, LOGL_ERROR, "frame too large: %d > N201(%d) "
"(discarding)\n", length + 3, 21);
"(discarding)\n", length, n201);
msgb_free(msg);
return send_rll_simple(RSL_MT_REL_IND, &dl->mctx);
}
@ -908,7 +908,7 @@ static int rslms_rx_rll_res_req(struct msgb *msg, struct lapdm_datalink *dl)
uint8_t sapi = rllh->link_id & 7;
struct tlv_parsed tv;
uint8_t length;
uint8_t n201 = 20; //FIXME
uint8_t n201 = (rllh->link_id & 0x40) ? N201_AB_SACCH : N201_AB_SDCCH;
struct osmo_dlsap_prim dp;
/* Set LAPDm context for established connection */